/* ==================== 基础变量 - iOS 26 Liquid Glass 风格 ==================== */
:root {
    /* 默认主题 - iOS 26 液态流体配色 */
    --primary-color: rgba(99, 102, 241, 0.75);
    --primary-dark: rgba(79, 70, 229, 0.85);
    --primary-light: rgba(129, 140, 248, 0.6);
    
    /* 学科主题色 - 流体渐变 */
    --chinese-color: rgba(255, 140, 66, 0.75);
    --chinese-dark: rgba(229, 106, 46, 0.85);
    --chinese-light: rgba(255, 176, 122, 0.6);
    
    --math-color: rgba(74, 144, 217, 0.75);
    --math-dark: rgba(53, 122, 189, 0.85);
    --math-light: rgba(107, 165, 231, 0.6);
    
    --english-color: rgba(76, 175, 80, 0.75);
    --english-dark: rgba(56, 142, 60, 0.85);
    --english-light: rgba(102, 187, 106, 0.6);
    
    /* iOS 26 液态玻璃背景 - 动态流动感 */
    --bg-color: linear-gradient(135deg, 
        rgba(102, 126, 234, 0.9) 0%, 
        rgba(118, 75, 162, 0.85) 25%, 
        rgba(240, 147, 251, 0.8) 50%,
        rgba(79, 172, 254, 0.85) 75%,
        rgba(102, 126, 234, 0.9) 100%);
    --bg-color-fallback: #667eea;
    --card-bg: rgba(255, 255, 255, 0.15);
    --card-bg-solid: rgba(255, 255, 255, 0.85);
    --surface-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-border-light: rgba(255, 255, 255, 0.15);
    --glass-highlight: rgba(255, 255, 255, 0.4);
    
    /* 文字色 */
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-light: rgba(255, 255, 255, 0.5);
    --text-white: #ffffff;
    --text-on-glass: rgba(30, 41, 59, 0.9);
    
    /* iOS 26 液态阴影 - 内发光效果 */
    --shadow-sm: 
        0 2px 8px rgba(0, 0, 0, 0.08), 
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -1px 0 rgba(255, 255, 255, 0.1);
    --shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12), 
        inset 0 1px 0 rgba(255, 255, 255, 0.35),
        inset 0 -1px 0 rgba(255, 255, 255, 0.1),
        0 0 20px rgba(255, 255, 255, 0.1);
    --shadow-lg: 
        0 12px 40px rgba(0, 0, 0, 0.15), 
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(255, 255, 255, 0.15),
        0 0 30px rgba(255, 255, 255, 0.15);
    --shadow-xl: 
        0 20px 60px rgba(0, 0, 0, 0.2), 
        inset 0 1px 0 rgba(255, 255, 255, 0.45),
        inset 0 -1px 0 rgba(255, 255, 255, 0.2),
        0 0 40px rgba(255, 255, 255, 0.2);
    --shadow-glow: 0 0 60px rgba(255, 255, 255, 0.4);
    
    /* 圆角 - iOS 26 超椭圆风格 */
    --radius-sm: 12px;
    --radius: 20px;
    --radius-lg: 28px;
    --radius-xl: 36px;
    --radius-full: 9999px;
    
    /* VIP 金色 - 流体光效 */
    --vip-gold: rgba(245, 158, 11, 0.85);
    --vip-gold-dark: rgba(217, 119, 6, 0.9);
    --vip-gradient: linear-gradient(135deg, 
        rgba(251, 191, 36, 0.8) 0%, 
        rgba(245, 158, 11, 0.85) 50%, 
        rgba(217, 119, 6, 0.8) 100%);
    
    /* iOS 26 液态玻璃特效 */
    --glass-blur: blur(30px) saturate(180%);
    --glass-blur-heavy: blur(50px) saturate(200%);
    --glass-saturate: saturate(200%);
}

/* ==================== 学科主题覆盖 ==================== */
[data-theme="chinese"] {
    --primary-color: var(--chinese-color);
    --primary-dark: var(--chinese-dark);
    --primary-light: var(--chinese-light);
}

[data-theme="math"] {
    --primary-color: var(--math-color);
    --primary-dark: var(--math-dark);
    --primary-light: var(--math-light);
}

[data-theme="english"] {
    --primary-color: var(--english-color);
    --primary-dark: var(--english-dark);
    --primary-light: var(--english-light);
}

/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* ==================== iOS 26 果冻按钮效果 ==================== */
/* 所有按钮的果冻弹跳效果 */
button, .action-btn, .btn-ai-send, .btn-preview, .btn-download, 
.btn-login-submit, .btn-register-submit, .btn-generate,
.btn-select-plan, .btn-preview-download, .btn-confirm-hobbies,
.btn-upload-avatar, .btn-action, .btn-send-code,
.btn-verify-submit, .btn-reset-submit, .btn-back-login,
.vip-btn, .tianbi-display, .login-btn, .search-btn {
    transition: transform 0.15s cubic-bezier(0.68, -0.55, 0.265, 1.55) !important;
}

button:active, .action-btn:active, .btn-ai-send:active, 
.btn-preview:active, .btn-download:active, 
.btn-login-submit:active, .btn-register-submit:active, 
.btn-generate:active, .btn-select-plan:active, 
.btn-preview-download:active, .btn-confirm-hobbies:active,
.btn-upload-avatar:active, .btn-action:active, .btn-send-code:active,
.btn-verify-submit:active, .btn-reset-submit:active, .btn-back-login:active,
.vip-btn:active, .tianbi-display:active, .login-btn:active, .search-btn:active {
    transform: scale(0.88) !important;
}

/* 悬停时的弹性效果 */
button:hover, .action-btn:hover, .btn-preview:hover, .btn-download:hover {
    transform: scale(1.03);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-color);
    background-size: 400% 400%;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: all 0.3s ease;
    animation: liquidFlow 15s ease infinite;
}

/* iOS 26 液态流动背景动画 */
@keyframes liquidFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ==================== 顶部导航栏 - iOS 26 Liquid Glass ==================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: linear-gradient(180deg, 
        rgba(255, 255, 255, 0.2) 0%, 
        rgba(255, 255, 255, 0.1) 100%);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    box-shadow: 
        0 4px 30px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

.header-left {
    flex: 1;
}

.login-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 14px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.login-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: white;
    object-fit: cover;
}

.header-center {
    flex: 1;
    text-align: center;
}

.logo {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

/* VIP 按钮 - 液态玻璃 */
.vip-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.8) 0%, rgba(245, 158, 11, 0.8) 50%, rgba(217, 119, 6, 0.8) 100%);
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 10px 20px;
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    animation: vipPulse 2s infinite;
}

@keyframes vipPulse {
    0%, 100% { box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.4); }
    50% { box-shadow: 0 8px 30px rgba(245, 158, 11, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.5); }
}

.vip-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 30px rgba(245, 158, 11, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

/* 天币显示 */
.tianbi-display {
    display: flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, 
        rgba(59, 130, 246, 0.7) 0%, 
        rgba(37, 99, 235, 0.8) 100%);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    color: white;
    font-size: 14px;
    font-weight: 600;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    margin-right: 8px;
}

.tianbi-display:hover {
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.tianbi-display:active {
    transform: scale(0.88);
}

.tianbi-icon {
    font-size: 16px;
}

.tianbi-amount {
    font-variant-numeric: tabular-nums;
}

.vip-icon {
    font-size: 18px;
}

/* ==================== 标签栏 - 液态玻璃 ==================== */
.nav-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 60px;
    z-index: 99;
    box-shadow: var(--shadow-sm);
}

.tabs {
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 6px;
    border-radius: var(--radius-full);
    border: 1px solid var(--glass-border-light);
}

.tab {
    padding: 12px 28px;
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.tab:hover {
    color: white;
    background: rgba(255, 255, 255, 0.15);
}

.tab.active {
    color: white;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ==================== 内容区域 ==================== */
.content {
    padding: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==================== 今日学习进度 ==================== */
.progress-dashboard {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-on-glass);
}

.progress-date {
    font-size: 14px;
    color: var(--text-on-glass);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    border: 1px solid var(--glass-border);
}

/* 总体进度圆环 */
.overall-progress {
    display: flex;
    justify-content: center;
    padding: 40px 0;
}

.progress-circle {
    position: relative;
    width: 200px;
    height: 200px;
}

.progress-circle svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.progress-circle circle {
    fill: none;
    stroke-width: 10;
}

.progress-bg {
    stroke: rgba(255, 255, 255, 0.2);
}

.progress-fill {
    stroke: rgba(99, 102, 241, 0.8);
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 1s ease;
    transform-origin: center;
    transform: rotate(-90deg);
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.5));
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.progress-percent {
    display: block;
    font-size: 48px;
    font-weight: 800;
    color: white;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    line-height: 1;
}

.progress-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

/* 学科进度卡片 - 液态玻璃 */
.subject-progress-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.subject-progress-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.subject-progress-card:hover {
    transform: translateY(-4px) translateZ(0);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.35);
}

.subject-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.chinese-card .subject-icon {
    background: linear-gradient(135deg, rgba(255, 176, 122, 0.6) 0%, rgba(255, 140, 66, 0.7) 100%);
}

.math-card .subject-icon {
    background: linear-gradient(135deg, rgba(107, 165, 231, 0.6) 0%, rgba(74, 144, 217, 0.7) 100%);
}

.english-card .subject-icon {
    background: linear-gradient(135deg, rgba(102, 187, 106, 0.6) 0%, rgba(76, 175, 80, 0.7) 100%);
}

.subject-info {
    flex: 1;
}

.subject-info h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-on-glass);
}

.mini-progress {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mini-bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mini-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 1s ease;
}

.chinese-card .mini-fill {
    background: linear-gradient(90deg, var(--chinese-color), var(--chinese-dark));
}

.math-card .mini-fill {
    background: linear-gradient(90deg, var(--math-color), var(--math-dark));
}

.english-card .mini-fill {
    background: linear-gradient(90deg, var(--english-color), var(--english-dark));
}

.mini-percent {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-on-glass);
    min-width: 40px;
    text-align: right;
}

/* 快捷操作 - 液态玻璃 */
.quick-actions {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
}

.quick-actions h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-on-glass);
}

.action-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.action-btn:hover {
    border-color: var(--glass-border);
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.action-icon {
    font-size: 32px;
}

.action-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-on-glass);
}

/* ==================== 学科页面 - 液态玻璃 ==================== */
.subject-page {
    text-align: center;
}

.subject-banner {
    padding: 60px 40px;
    border-radius: var(--radius-xl);
    margin-bottom: 40px;
    color: white;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

.chinese-banner {
    background: linear-gradient(135deg, rgba(255, 140, 66, 0.7) 0%, rgba(229, 106, 46, 0.8) 100%);
}

.math-banner {
    background: linear-gradient(135deg, rgba(74, 144, 217, 0.7) 0%, rgba(53, 122, 189, 0.8) 100%);
}

.english-banner {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.7) 0%, rgba(56, 142, 60, 0.8) 100%);
}

.subject-banner h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.subject-banner p {
    font-size: 18px;
    opacity: 0.95;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.coming-soon {
    padding: 80px 40px;
}

.coming-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.coming-soon p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.coming-soon .sub-text {
    font-size: 14px;
    color: var(--text-light);
}

/* ==================== 弹窗基础样式 - 液态玻璃 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 200;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal.show {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: var(--glass-blur-heavy);
    -webkit-backdrop-filter: var(--glass-blur-heavy);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    max-height: 85vh;
    overflow: hidden;
    border: none;
    box-shadow: var(--shadow-xl), 0 0 60px rgba(255, 255, 255, 0.2);
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    padding: 24px 24px 16px;
    border-bottom: 1px solid var(--glass-border);
    position: relative;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-on-glass);
}

.modal-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid var(--glass-border);
    font-size: 24px;
    color: var(--text-on-glass);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    user-select: none;
    -webkit-user-select: none;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-on-glass);
    transform: scale(1.1);
}

.modal-close:active {
    color: var(--text-on-glass);
    background: rgba(255, 255, 255, 0.4);
    transform: scale(0.85);
}

.modal-close:focus-visible {
    outline: 2px solid rgba(99, 102, 241, 0.5);
    outline-offset: 2px;
}

.modal-close:hover {
    background: var(--surface-bg);
    color: var(--text-primary);
}
/* 阻止叉号选中变白 */
.modal-close {
    user-select: none;
    -webkit-user-select: none;
}

.modal-close:focus {
    outline: none;
}

.modal-close:focus-visible {
    outline: 2px solid rgba(99, 102, 241, 0.4);
    outline-offset: 2px;
}

/* 关闭按钮SVG图标 - 强制使用深色 */
.modal-close svg.close-icon path, .modal-close svg path {
    stroke: var(--text-on-glass);
}

.modal-close:hover svg path {
    stroke: var(--text-on-glass);
}

.modal-close:active svg path {
    stroke: var(--text-on-glass);
}


.modal-close::selection {
    color: var(--text-on-glass);
    background: transparent;
}


.modal-body {
    padding: 24px;
    overflow-y: auto;
    max-height: calc(85vh - 80px);
}

/* ==================== 角色选择 ==================== */
.role-content {
    max-width: 600px;
}

.role-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 20px 0;
}

.role-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.role-card:hover {
    border-color: var(--glass-border);
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.role-card.selected {
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(99, 102, 241, 0.2);
}

.role-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.role-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-on-glass);
}

.role-card p {
    font-size: 13px;
    color: var(--text-on-glass);
    opacity: 0.8;
}

/* ==================== 爱好选择 ==================== */
.hobby-content {
    max-width: 700px;
}

.hobby-categories {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 8px;
}

.hobby-categories::-webkit-scrollbar {
    width: 6px;
}

.hobby-categories::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 3px;
}

.category-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-on-glass);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hobby-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.hobby-tag {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    color: var(--text-on-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.hobby-tag:hover {
    border-color: var(--glass-border);
    background: rgba(255, 255, 255, 0.35);
}

.hobby-tag input {
    display: none;
}

.hobby-tag:has(input:checked) {
    background: rgba(99, 102, 241, 0.7);
    color: white;
    border-color: rgba(255, 255, 255, 0.4);
}

.hobby-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
}

.hobby-count {
    font-size: 14px;
    color: var(--text-on-glass);
}

.hobby-count span {
    font-weight: 700;
    color: var(--primary-color);
}

.btn-confirm-hobbies {
    padding: 12px 32px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.btn-confirm-hobbies:hover {
    transform: translateY(-2px);
    background: rgba(99, 102, 241, 0.95);
    box-shadow: var(--shadow-lg);
}

.btn-confirm-hobbies:disabled {
    background: rgba(148, 163, 184, 0.5);
    cursor: not-allowed;
    transform: none;
}

/* ==================== 试卷生成器 ==================== */
.generator-content {
    max-width: 500px;
}

.generator-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.generator-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.generator-form label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.subject-selector,
.difficulty-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.subject-option,
.diff-option {
    padding: 12px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.subject-option:hover,
.diff-option:hover {
    background: rgba(255, 255, 255, 0.35);
}

.subject-option:has(input:checked),
.diff-option:has(input:checked) {
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(99, 102, 241, 0.25);
}

.subject-option input,
.diff-option input {
    display: none;
}

.generator-form select,
.generator-form input[type="range"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    font-size: 14px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.generator-form select:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(255, 255, 255, 0.35);
}

.range-value {
    display: inline-block;
    margin-top: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

.generator-notice {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: rgba(254, 243, 199, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius);
    margin: 10px 0;
}

.notice-icon {
    font-size: 24px;
}

.generator-notice p {
    font-size: 14px;
    font-weight: 600;
    color: #92400e;
    margin: 0;
}

.generator-notice .sub {
    font-size: 12px;
    font-weight: normal;
    color: #a16207;
    margin-top: 4px;
}

.btn-generate {
    padding: 16px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.btn-generate:hover {
    transform: translateY(-2px);
    background: rgba(99, 102, 241, 0.95);
    box-shadow: var(--shadow-lg);
}

.btn-icon {
    font-size: 20px;
}

/* ==================== 表单样式 - 液态玻璃 ==================== */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-on-glass);
}

.generator-form label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-on-glass);
}

.form-group input {
    padding: 12px 16px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    font-size: 14px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-on-glass);
}

.form-group input:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(255, 255, 255, 0.35);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

.required {
    color: #ef4444;
}

/* ==================== 会员中心 ==================== */
.membership-content {
    max-width: 600px;
}

.membership-body {
    padding: 0;
}

.membership-status {
    text-align: center;
    padding: 40px 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.membership-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.2);
    padding: 14px 28px;
    border-radius: var(--radius-full);
    margin-bottom: 12px;
    backdrop-filter: blur(10px);
}

.badge-icon {
    font-size: 28px;
}

.badge-text {
    font-size: 20px;
    font-weight: 700;
}

.membership-desc {
    font-size: 14px;
    opacity: 0.9;
}

.membership-plans {
    padding: 24px;
}

.membership-plans h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
    color: var(--text-on-glass);
}

.plans-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.plan-card {
    position: relative;
    padding: 24px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.plan-card:hover {
    border-color: rgba(245, 158, 11, 0.5);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.35);
}

.plan-card.recommended {
    background: rgba(254, 243, 199, 0.6);
    border-color: rgba(245, 158, 11, 0.6);
}

.plan-card.best-value {
    background: rgba(254, 226, 226, 0.6);
    border-color: rgba(239, 68, 68, 0.6);
}

.plan-badge {
    position: absolute;
    top: -10px;
    right: 10px;
    background: var(--vip-gold);
    color: white;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

.plan-card.best-value .plan-badge {
    background: #ef4444;
}

.plan-name {
    display: block;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-on-glass);
    margin-bottom: 8px;
}

.plan-price {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: rgba(217, 119, 6, 0.9);
    margin-bottom: 4px;
}

.plan-duration {
    font-size: 13px;
    color: var(--text-on-glass);
    opacity: 0.7;
    margin-bottom: 16px;
}

.btn-select-plan {
    width: 100%;
    padding: 12px;
    background: rgba(245, 158, 11, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-select-plan:hover {
    transform: scale(1.02);
    background: rgba(245, 158, 11, 0.95);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

/* ==================== 用户中心 ==================== */
.user-center-content {
    max-width: 500px;
}

.user-center-body {
    padding: 0;
}

.avatar-upload-section {
    text-align: center;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

.avatar-preview-large {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto 16px;
    border-radius: 50%;
    overflow: hidden;
    cursor: pointer;
    border: 4px solid white;
    box-shadow: var(--shadow-lg);
}

.avatar-preview-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.avatar-overlay span {
    color: white;
    font-size: 13px;
}

.avatar-preview-large:hover .avatar-overlay {
    opacity: 1;
}

.btn-upload-avatar {
    padding: 10px 20px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    color: white;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-upload-avatar:hover {
    background: rgba(99, 102, 241, 0.95);
}

/* 保存修改按钮 */
.btn-save-profile {
    width: 100%;
    padding: 12px 24px;
    background: rgba(99, 102, 241, 0.8);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.btn-save-profile:hover {
    background: rgba(99, 102, 241, 0.95);
    transform: translateY(-1px);
}

.btn-save-profile:active {
    transform: scale(0.97);
}



.user-info-section,
.user-stats-section,
.account-actions {
    padding: 24px;
    border-bottom: 1px solid var(--glass-border);
}

.user-info-section h3,
.user-stats-section h3,
.user-balance-section h3,
.account-actions h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-on-glass);
}

/* 余额显示 - 液态玻璃 */
.user-balance-section {
    padding: 24px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius);
    margin-bottom: 20px;
    border: 1px solid var(--glass-border);
}

.balance-display {
    background: rgba(99, 102, 241, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 24px;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.balance-amount {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.balance-label {
    font-size: 14px;
    opacity: 0.9;
}

.balance-value {
    font-size: 32px;
    font-weight: 700;
}

.balance-hint {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    opacity: 0.8;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.2);
}

.vip-hint {
    background: rgba(255,255,255,0.2);
    padding: 2px 10px;
    border-radius: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border-light);
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-on-glass);
    opacity: 0.7;
}

.btn-action {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    margin-bottom: 12px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-action:hover {
    background: rgba(255, 255, 255, 0.3);
}

.btn-action .arrow {
    color: var(--text-light);
}

/* ==================== 登录注册表单 ==================== */
.login-form,
.register-form {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.btn-login-submit,
.btn-register-submit {
    width: 100%;
    padding: 14px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 8px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-login-submit:hover,
.btn-register-submit:hover {
    transform: translateY(-2px);
    background: rgba(99, 102, 241, 0.95);
    box-shadow: var(--shadow-lg);
}

.auth-links {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.auth-links a:hover {
    text-decoration: underline;
}

.form-options {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.password-strength {
    height: 4px;
    border-radius: 2px;
    margin-top: 8px;
    transition: all 0.3s ease;
}

.password-strength.weak {
    background: #ef4444;
    width: 33%;
}

.password-strength.medium {
    background: #f59e0b;
    width: 66%;
}

.password-strength.strong {
    background: #10b981;
    width: 100%;
}

/* ==================== 搜索框 ==================== */
.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    padding: 4px 4px 4px 16px;
    margin-right: 12px;
    transition: all 0.3s ease;
}

.search-box:focus-within {
    background: rgba(255, 255, 255, 0.3);
}

.search-box input {
    flex: 1;
    border: none;
    background: transparent;
    color: white;
    font-size: 14px;
    outline: none;
    padding: 6px 8px;
    width: 140px;
}

.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.search-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background: rgba(255, 255, 255, 0.4);
}

.search-btn svg {
    width: 16px;
    height: 16px;
    color: white;
}

.search-clear {
    width: 20px;
    height: 20px;
    border: none;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    cursor: pointer;
    color: white;
    font-size: 14px;
    margin-left: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 搜索结果 */
.search-results {
    display: none;
    padding: 24px;
    animation: fadeIn 0.3s ease;
}

.search-results.show {
    display: block;
}

.search-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.search-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-on-glass);
}

.search-count {
    font-size: 14px;
    color: var(--text-on-glass);
    opacity: 0.7;
    margin-left: 8px;
}

.btn-close-search {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    color: var(--text-on-glass);
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-close-search:hover {
    background: rgba(255, 255, 255, 0.35);
}

/* 试卷列表 - 液态玻璃 */
.paper-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.paper-card {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.2) 0%, 
        rgba(255, 255, 255, 0.1) 50%,
        rgba(255, 255, 255, 0.15) 100%);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateZ(0);
    position: relative;
    overflow: hidden;
}

/* iOS 26 液态高光效果 */
.paper-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 200%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%
    );
    transition: left 0.6s ease;
    pointer-events: none;
}

.paper-card:hover::before {
    left: 100%;
}

.paper-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        0 0 30px rgba(255, 255, 255, 0.2);
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.3) 0%, 
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0.25) 100%);
}

.paper-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 12px 0;
    color: var(--text-on-glass);
}

.paper-meta {
    display: flex;
    gap: 8px;
    margin: 0 0 12px 0;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
}

.tag.grade {
    background: rgba(224, 231, 255, 0.7);
    color: #4f46e5;
    backdrop-filter: blur(5px);
}

.tag.subject-chinese {
    background: rgba(255, 237, 213, 0.7);
    color: #ea580c;
    backdrop-filter: blur(5px);
}

.tag.subject-math {
    background: rgba(219, 234, 254, 0.7);
    color: #2563eb;
    backdrop-filter: blur(5px);
}

.tag.subject-english {
    background: rgba(220, 252, 231, 0.7);
    color: #16a34a;
    backdrop-filter: blur(5px);
}

.paper-desc {
    font-size: 13px;
    color: var(--text-on-glass);
    margin-bottom: 16px;
    line-height: 1.5;
    opacity: 0.8;
}

.paper-actions {
    display: flex;
    gap: 10px;
}

.btn-preview, .btn-download {
    flex: 1;
    padding: 10px;
    border-radius: var(--radius);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    border: none;
}

.btn-preview {
    background: rgba(255, 255, 255, 0.25);
    color: var(--text-on-glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-preview:hover {
    background: rgba(255, 255, 255, 0.4);
}

.btn-download {
    background: rgba(99, 102, 241, 0.8);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-download:hover {
    background: rgba(99, 102, 241, 0.95);
}

/* 忘记密码 */
.verify-methods {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.verify-method {
    padding: 12px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.verify-method:hover {
    background: rgba(255, 255, 255, 0.35);
}

.verify-method.active {
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(99, 102, 241, 0.25);
}

.verify-method input {
    display: none;
}

.verify-code-group {
    display: flex;
    gap: 10px;
}

.verify-code-group input {
    flex: 1;
}

.btn-send-code {
    padding: 10px 16px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    color: white;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-send-code:hover {
    background: rgba(99, 102, 241, 0.95);
}

.btn-verify-submit, .btn-reset-submit {
    width: 100%;
    padding: 12px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.btn-verify-submit:hover, .btn-reset-submit:hover {
    background: rgba(99, 102, 241, 0.95);
}

.success-message {
    text-align: center;
    padding: 40px 20px;
}

.success-icon {
    width: 64px;
    height: 64px;
    background: rgba(16, 185, 129, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin: 0 auto 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.success-message h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.success-message p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.btn-back-login {
    padding: 12px 32px;
    background: rgba(99, 102, 241, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    color: white;
    font-size: 15px;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.btn-back-login:hover {
    background: rgba(99, 102, 241, 0.95);
}

/* ==================== 列表底部提示 - 液态玻璃 ==================== */
.list-bottom-hint {
    text-align: center;
    padding: 40px 20px 60px;
    margin-top: 20px;
}

.hint-text {
    font-size: 18px;
    color: var(--text-on-glass);
    margin-bottom: 12px;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.hint-actions {
    font-size: 14px;
    color: var(--text-on-glass);
    opacity: 0.7;
}

.hint-link {
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: none;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    position: relative;
}

.hint-link:hover {
    background: rgba(99, 102, 241, 0.1);
    text-decoration: underline;
}

.hint-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 8px;
    right: 8px;
    height: 2px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.hint-link:hover::after {
    transform: scaleX(1);
}

.hint-separator {
    margin: 0 8px;
    color: var(--text-light);
}

/* 学科主题色适配 */
[data-theme="chinese"] .hint-link {
    color: var(--chinese-color);
}

[data-theme="chinese"] .hint-link:hover {
    background: rgba(255, 140, 66, 0.1);
}

[data-theme="chinese"] .hint-link::after {
    background: var(--chinese-color);
}

[data-theme="math"] .hint-link {
    color: var(--math-color);
}

[data-theme="math"] .hint-link:hover {
    background: rgba(74, 144, 217, 0.1);
}

[data-theme="math"] .hint-link::after {
    background: var(--math-color);
}

[data-theme="english"] .hint-link {
    color: var(--english-color);
}

[data-theme="english"] .hint-link:hover {
    background: rgba(76, 175, 80, 0.1);
}

[data-theme="english"] .hint-link::after {
    background: var(--english-color);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .header {
        padding: 10px 16px;
    }
    
    .logo {
        font-size: 20px;
    }
    
    .search-box {
        display: none;
    }
    
    .vip-btn {
        padding: 8px 14px;
        font-size: 12px;
    }
    
    .nav-bar {
        padding: 12px 16px;
        top: 56px;
    }
    
    .tabs {
        gap: 6px;
    }
    
    .tab {
        padding: 10px 18px;
        font-size: 14px;
    }
    
    .content {
        padding: 16px;
    }
    
    .subject-progress-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
    }
    
    .role-options {
        grid-template-columns: 1fr;
    }
    
    .plans-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .progress-circle {
        width: 160px;
        height: 160px;
    }
    
    .progress-percent {
        font-size: 36px;
    }
    
    .subject-banner h2 {
        font-size: 28px;
    }
}

/* ==================== 试卷预览弹窗 - 液态玻璃 ==================== */
.preview-content {
    max-width: 800px;
    width: 90%;
    max-height: 85vh;
}

.preview-body {
    max-height: calc(85vh - 80px);
    overflow-y: auto;
    padding: 24px;
}

.preview-info {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--glass-border);
}

.preview-info-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 12px;
}

.preview-info-row:last-child {
    margin-bottom: 0;
}

.preview-info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.preview-info-item .label {
    font-weight: 600;
    color: var(--text-on-glass);
}

.preview-info-item .value {
    color: var(--primary-color);
    font-weight: 500;
}

.preview-description {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--glass-border);
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.preview-questions {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.preview-question-item {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.3s ease;
}

.preview-question-item:hover {
    border-color: var(--glass-border);
    box-shadow: var(--shadow);
    background: rgba(255, 255, 255, 0.35);
}

.question-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.question-number {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}

.question-type {
    background: rgba(99, 102, 241, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.question-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-on-glass);
    white-space: pre-line;
}

.preview-actions {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    justify-content: center;
}

.btn-preview-download {
    background: rgba(99, 102, 241, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 14px 48px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
}

.btn-preview-download:hover {
    transform: translateY(-2px);
    background: rgba(99, 102, 241, 0.95);
    box-shadow: var(--shadow-lg);
}

.preview-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.preview-empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.preview-empty-text {
    font-size: 16px;
}

/* 预览弹窗响应式 */
@media (max-width: 640px) {
    .preview-content {
        width: 95%;
        max-height: 90vh;
    }
    
    .preview-body {
        padding: 16px;
    }
    
    .preview-info {
        padding: 16px;
    }
    
    .preview-info-row {
        flex-direction: column;
        gap: 8px;
    }
    
    .preview-question-item {
        padding: 16px;
    }
}

/* ==================== AI 学习助手 - iOS 26 Liquid Glass 全屏 ==================== */
.ai-chat-content {
    max-width: 100%;
    width: 100%;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
    margin: 0;
}

.ai-chat-body {
    padding: 0;
    height: calc(100vh - 70px);
    max-height: calc(100vh - 70px);
}

.ai-chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.ai-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    max-height: calc(100vh - 180px);
}

/* 欢迎消息 */
.ai-welcome {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.ai-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.8) 0%, 
        rgba(129, 140, 248, 0.8) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.ai-bubble {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.25) 0%, 
        rgba(255, 255, 255, 0.15) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 4px 15px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    max-width: calc(100% - 60px);
}

.ai-bubble p {
    margin: 0 0 8px 0;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-on-glass);
}

.ai-bubble p:last-child {
    margin-bottom: 0;
}

.ai-bubble ul {
    margin: 8px 0;
    padding-left: 20px;
}

.ai-bubble li {
    margin: 4px 0;
    font-size: 14px;
    color: var(--text-on-glass);
}

/* 用户消息 */
.ai-message {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.ai-message.user {
    flex-direction: row-reverse;
}

.ai-message.user .ai-bubble {
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.7) 0%, 
        rgba(79, 70, 229, 0.7) 100%);
    color: white;
}

.ai-message.user .ai-bubble p {
    color: white;
}

/* 输入区域 */
.ai-chat-input-area {
    padding: 16px 20px 20px;
    background: linear-gradient(180deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.1) 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.ai-chat-input-wrapper {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    padding: 8px 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.ai-chat-input-wrapper:focus-within {
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        0 4px 20px rgba(0, 0, 0, 0.1);
}

.ai-chat-input-wrapper textarea {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: 100px;
    color: var(--text-on-glass);
    font-family: inherit;
}

.ai-chat-input-wrapper textarea::placeholder {
    color: rgba(30, 41, 59, 0.5);
}

.btn-ai-send {
    width: 36px;
    height: 36px;
    border: none;
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.8) 0%, 
        rgba(79, 70, 229, 0.8) 100%);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ai-send:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-ai-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-ai-send svg {
    width: 18px;
    height: 18px;
    color: white;
}

.ai-chat-hint {
    text-align: center;
    margin-top: 12px;
    font-size: 12px;
    color: rgba(30, 41, 59, 0.5);
}

/* 打字动画 */
.ai-typing {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
}

.ai-typing span {
    width: 8px;
    height: 8px;
    background: rgba(99, 102, 241, 0.6);
    border-radius: 50%;
    animation: typingBounce 1.4s ease-in-out infinite;
}

.ai-typing span:nth-child(1) { animation-delay: 0s; }
.ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-10px); }
}

/* 考试模式样式 */
.quiz-bubble {
    background: linear-gradient(135deg, 
        rgba(245, 158, 11, 0.25) 0%, 
        rgba(217, 119, 6, 0.2) 100%) !important;
    border: 1px solid rgba(245, 158, 11, 0.3) !important;
}

.quiz-question {
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    padding: 12px;
    margin: 12px 0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.quiz-question p {
    margin: 6px 0;
}

.quiz-hint {
    font-size: 12px;
    color: rgba(245, 158, 11, 0.9);
    margin-top: 8px;
}

/* AI 聊天响应式 */
@media (max-width: 640px) {
    .ai-chat-content {
        max-width: 100%;
        width: 100%;
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
        margin: 0;
    }
    
    .ai-chat-body {
        height: calc(100vh - 70px);
        max-height: calc(100vh - 70px);
    }
    
    .ai-chat-messages {
        max-height: calc(100vh - 180px);
    }
}

/* 关闭按钮SVG强制深色 */
svg.close-icon path,
.modal-close svg path {
    stroke: var(--text-on-glass) !important;
}
/* ==================== AI学习主标签 - 内联聊天 ==================== */
.ai-main-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 160px);
    max-width: 960px;
    margin: 0 auto;
    width: 100%;
    padding: 0 20px;
}

.ai-main-header {
    text-align: center;
    padding: 24px 20px 16px;
}

.ai-main-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.ai-main-icon {
    font-size: 36px;
}

.ai-main-title h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-on-glass);
    margin: 0;
}

.ai-main-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 0;
}

.ai-main-desc strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 聊天区域 - 玻璃卡片 */
.ai-main-chat {
    flex: 1;
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow);
    overflow-y: auto;
    padding: 20px 24px;
    margin: 0 0 16px;
    min-height: 200px;
    max-height: none;
    scroll-behavior: smooth;
}

.ai-main-chat::-webkit-scrollbar { width: 4px; }
.ai-main-chat::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.3); border-radius: 4px; }

.ai-main-messages .ai-welcome .ai-bubble ul {
    margin: 8px 0;
    padding-left: 20px;
}

.ai-main-messages .ai-welcome .ai-bubble li {
    margin: 4px 0;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-on-glass);
}

.ai-main-messages {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-main-messages .ai-message {
    display: flex;
    gap: 10px;
    margin-bottom: 0;
}

.ai-main-messages .ai-message.user {
    flex-direction: row-reverse;
}

.ai-main-messages .ai-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.8), rgba(129, 140, 248, 0.8));
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.ai-main-messages .ai-bubble {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25), rgba(255, 255, 255, 0.15));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    max-width: calc(100% - 50px);
}

.ai-main-messages .ai-bubble p {
    margin: 0 0 6px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-on-glass);
}

.ai-main-messages .ai-bubble p:last-child { margin-bottom: 0; }
.ai-main-messages .ai-bubble ul { margin: 6px 0; padding-left: 20px; }
.ai-main-messages .ai-bubble li { margin: 3px 0; font-size: 14px; color: var(--text-on-glass); }

.ai-main-messages .user .ai-bubble {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.7), rgba(79, 70, 229, 0.7));
    color: white;
}

.ai-main-messages .user .ai-bubble p { color: white; }

/* 输入区域 */
.ai-main-input-area {
    padding: 0 0 8px;
}

.ai-main-input-wrapper {
    display: flex;
    gap: 10px;
    align-items: center;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 8px 8px 8px 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.ai-main-input-wrapper:focus-within {
    background: rgba(255, 255, 255, 0.3);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 4px 20px rgba(0, 0, 0, 0.1);
}

.ai-main-input-wrapper input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 15px;
    line-height: 1.5;
    outline: none;
    color: var(--text-on-glass);
    font-family: inherit;
    padding: 8px 0;
}

.ai-main-input-wrapper input::placeholder {
    color: rgba(30, 41, 59, 0.4);
}

.btn-ai-main-send {
    width: 44px;
    height: 44px;
    border: none;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.8), rgba(79, 70, 229, 0.8));
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ai-main-send:hover { transform: scale(1.1); box-shadow: 0 4px 20px rgba(99, 102, 241, 0.5); }
.btn-ai-main-send:active { transform: scale(0.92); }
.btn-ai-main-send svg { color: white; width: 20px; height: 20px; }

.btn-ai-main-send:hover { transform: scale(1.1); box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4); }
.btn-ai-main-send:active { transform: scale(0.9); }
.btn-ai-main-send svg { color: white; }

.ai-main-hint {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    font-size: 12px;
    color: rgba(30, 41, 59, 0.45);
    padding: 0 4px;
}

.ai-main-fullscreen {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.ai-main-fullscreen:hover {
    background: rgba(99, 102, 241, 0.1);
}

/* 快速跳转科目 */
.ai-main-subjects {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 4px;
    flex-wrap: wrap;
}

.ai-subjects-label {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.ai-subject-btn {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    color: var(--text-on-glass);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.ai-subject-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.ai-subject-btn:active { transform: scale(0.95); }

.ai-subject-btn.chinese {
    color: #ea580c;
    background: rgba(255, 140, 66, 0.12);
    border-color: rgba(255, 140, 66, 0.2);
}
.ai-subject-btn.chinese:hover { background: rgba(255, 140, 66, 0.25); }

.ai-subject-btn.math {
    color: #2563eb;
    background: rgba(74, 144, 217, 0.12);
    border-color: rgba(74, 144, 217, 0.2);
}
.ai-subject-btn.math:hover { background: rgba(74, 144, 217, 0.25); }

.ai-subject-btn.english {
    color: #16a34a;
    background: rgba(76, 175, 80, 0.12);
    border-color: rgba(76, 175, 80, 0.2);
}
.ai-subject-btn.english:hover { background: rgba(76, 175, 80, 0.25); }


/* ==================== Dynamic Island 风格通知 ==================== */
.dynamic-island {
    display: none !important;
    position: fixed;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    min-width: 120px;
    max-width: 360px;
    padding: 10px 20px;
    background: rgba(30, 30, 40, 0.85);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 0 20px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.dynamic-island.show { display: flex !important; animation: islandSlideIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
.dynamic-island .island-icon { font-size: 16px; flex-shrink: 0; }
.dynamic-island .island-text { font-size: 14px; font-weight: 500; color: white; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

@media (min-width: 1200px) {
    .ai-main-container {
        max-width: 1100px;
    }
}

/* ==================== AI学习 全屏模式 ==================== */
.tab-content#ai {
    height: calc(100vh - 158px);
}


.tab-content#ai .ai-main-container {
    max-width: 100%;
    height: 100%;
    padding: 0 28px;
}

.tab-content#ai .ai-main-header {
    padding: 16px 0 8px;
}

.tab-content#ai .ai-main-title h2 {
    font-size: 20px;
}

.tab-content#ai .ai-main-chat {
    margin: 0 0 12px;
    padding: 20px 24px;
    min-height: 80px;
    border-radius: var(--radius-lg);
}

.tab-content#ai .ai-main-input-area {
    padding: 0;
}

.tab-content#ai .ai-main-subjects {
    padding: 4px 0 16px;
}

.tab-content#ai .ai-main-container {
    max-width: 100%;
    height: 100%;
    padding: 0 28px;
}

.tab-content#ai .ai-main-header {
    padding: 16px 0 8px;
}

.tab-content#ai .ai-main-title h2 {
    font-size: 20px;
}

.tab-content#ai .ai-main-chat {
    margin: 0 0 12px;
    padding: 20px 24px;
    min-height: 80px;
    border-radius: var(--radius-lg);
}

.tab-content#ai .ai-main-input-area {
    padding: 0;
}

.tab-content#ai .ai-main-subjects {
    padding: 4px 0 16px;
}




/* ==================== AI学习 - 简洁启动页 ==================== */
.ai-landing {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 40px 20px 20px;
}

.ai-landing-center {
    text-align: center;
    max-width: 480px;
}

.ai-landing-icon {
    font-size: 64px;
    margin-bottom: 16px;
    display: block;
}

.ai-landing-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-on-glass);
    margin: 0 0 8px;
}

.ai-landing-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 0 0 32px;
    line-height: 1.6;
}

.ai-landing-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    background: linear-gradient(135deg, rgba(99,102,241,0.85), rgba(79,70,229,0.85));
    border: 1px solid rgba(255,255,255,0.35);
    border-radius: var(--radius-xl);
    color: white;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 8px 30px rgba(99,102,241,0.3), 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.ai-landing-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 40px rgba(99,102,241,0.45), 0 2px 8px rgba(0,0,0,0.1);
}

.ai-landing-btn:active {
    transform: scale(0.95);
}

.ai-landing-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 28px;
}

.chip {
    padding: 10px 18px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-full);
    color: var(--text-on-glass);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.25s ease;
}

.chip:hover {
    background: rgba(99,102,241,0.2);
    border-color: rgba(99,102,241,0.3);
    transform: translateY(-1px);
}

.ai-landing-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
    padding: 16px 0;
    font-size: 13px;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

/* 搜索结果显示 */
.search-results.show {
    display: block;
}

/* ==================== 成长中心 ==================== */
.growth-page {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 980px;
    margin: 0 auto;
}

.growth-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 26px 28px;
    border-radius: var(--radius-lg);
    background:
        linear-gradient(135deg, rgba(99,102,241,0.78), rgba(79,70,229,0.64)),
        rgba(255,255,255,0.1);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

.growth-kicker {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.12em;
    color: rgba(255,255,255,0.7);
}

.growth-hero h2 {
    margin: 7px 0 5px;
    font-size: clamp(22px, 4vw, 31px);
    color: #fff;
}

.growth-hero p {
    color: rgba(255,255,255,0.72);
    font-size: 13px;
}

.growth-time-ring {
    width: 112px;
    height: 112px;
    flex: 0 0 112px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.32);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.45), 0 12px 30px rgba(30,33,80,0.18);
}

.growth-time-ring strong {
    font-size: 22px;
}

.growth-time-ring span {
    font-size: 11px;
    color: rgba(255,255,255,0.72);
}

.growth-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.growth-card {
    min-width: 0;
    padding: 20px;
    border-radius: var(--radius);
    background: rgba(255,255,255,0.74);
    color: #1e293b;
    border: 1px solid rgba(255,255,255,0.42);
    backdrop-filter: var(--glass-blur-heavy);
    -webkit-backdrop-filter: var(--glass-blur-heavy);
    box-shadow: var(--shadow);
}

.growth-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 14px;
}

.growth-card-head h3 {
    font-size: 16px;
    color: #20264a;
}

.growth-pill {
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(99,102,241,0.12);
    color: #4f46e5;
    font-size: 11px;
    font-weight: 800;
    white-space: nowrap;
}

.guard-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.guard-stats div {
    padding: 10px;
    border-radius: 12px;
    background: rgba(99,102,241,0.08);
}

.guard-stats span {
    display: block;
    color: #70778f;
    font-size: 11px;
}

.guard-stats b {
    display: block;
    margin-top: 3px;
    color: #252a50;
    font-size: 16px;
}

.guard-progress {
    height: 9px;
    margin-top: 14px;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(99,102,241,0.13);
}

.guard-progress i {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #6366f1, #22c1c3);
    transition: width .4s ease;
}

.growth-muted {
    color: #737a93;
    font-size: 12px;
    line-height: 1.7;
}

.growth-actions,
.tts-actions {
    display: flex;
    align-items: center;
    gap: 9px;
    flex-wrap: wrap;
    margin-top: 14px;
}

.growth-actions button,
.tts-actions button,
.growth-text-btn {
    border: 1px solid rgba(99,102,241,0.2);
    border-radius: 10px;
    padding: 9px 13px;
    background: rgba(255,255,255,0.68);
    color: #444b70;
    font-size: 12px;
    font-weight: 800;
    cursor: pointer;
}

.growth-text-btn {
    padding: 5px 9px;
    background: transparent;
}

.growth-primary {
    width: 100%;
    margin-top: 12px;
    padding: 11px 14px;
    border: none;
    border-radius: 11px;
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: #fff;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
}

.checkin-main {
    margin: 8px 0 15px;
}

.checkin-main strong {
    display: block;
    font-size: 32px;
    color: #4f46e5;
}

.checkin-main span {
    color: #737a93;
    font-size: 12px;
}

.checkin-dots {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}

.checkin-dots i {
    height: 22px;
    border-radius: 7px;
    background: rgba(99,102,241,0.11);
}

.checkin-dots i.done {
    background: linear-gradient(135deg, #6366f1, #22c1c3);
}

.subject-progress-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.growth-subject {
    padding: 14px;
    border-radius: 13px;
    background: rgba(99,102,241,0.08);
}

.growth-subject b {
    display: block;
    font-size: 16px;
    color: #252a50;
}

.growth-subject span {
    display: block;
    color: #737a93;
    font-size: 11px;
    margin-top: 4px;
}

.mistake-form {
    display: grid;
    gap: 9px;
}

.mistake-form input,
.mistake-form textarea,
.mistake-form select,
.textbook-filters select,
.tts-actions select,
.voice-card textarea,
.growth-card-head select {
    width: 100%;
    padding: 10px 11px;
    border: 1px solid rgba(99,102,241,0.18);
    border-radius: 10px;
    background: rgba(255,255,255,0.68);
    color: #252a50;
    font: inherit;
    outline: none;
}

.mistake-form textarea,
.voice-card textarea {
    min-height: 82px;
    resize: vertical;
}

.task-list,
.mistake-list,
.course-list {
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.growth-task,
.mistake-item,
.course-item {
    padding: 12px;
    border-radius: 12px;
    background: rgba(99,102,241,0.07);
    border: 1px solid rgba(99,102,241,0.1);
}

.growth-task {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.growth-task strong,
.mistake-item strong,
.course-item strong {
    color: #282e54;
    font-size: 13px;
}

.growth-task span,
.mistake-item p,
.course-item p {
    color: #727990;
    font-size: 12px;
    line-height: 1.6;
}

.mistake-item .mistake-head {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.mistake-item button {
    margin-top: 8px;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid rgba(16,185,129,0.2);
    background: rgba(16,185,129,0.08);
    color: #047857;
    font-size: 11px;
    font-weight: 800;
    cursor: pointer;
}

.textbook-filters {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 12px;
}

.course-units {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.course-units span {
    padding: 4px 8px;
    border-radius: 999px;
    background: rgba(99,102,241,0.11);
    color: #4f46e5;
    font-size: 11px;
}

.learning-stat-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
}

.learning-stat-grid div {
    padding: 13px;
    border-radius: 12px;
    background: rgba(99,102,241,0.08);
}

.learning-stat-grid span {
    display: block;
    color: #737a93;
    font-size: 11px;
}

.learning-stat-grid b {
    display: block;
    margin-top: 4px;
    color: #252a50;
    font-size: 18px;
}

.learning-chart {
    min-height: 120px;
    margin-top: 15px;
    padding: 12px 10px 8px;
    border-radius: 12px;
    background: rgba(255,255,255,0.48);
}

.chart-bars {
    height: 104px;
    display: flex;
    align-items: flex-end;
    gap: 5px;
}

.chart-day {
    min-width: 10px;
    flex: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    gap: 5px;
}

.chart-day i {
    display: block;
    width: 100%;
    max-width: 28px;
    border-radius: 6px 6px 3px 3px;
    background: linear-gradient(180deg, #22c1c3, #6366f1);
}

.chart-day span {
    color: #858ba0;
    font-size: 9px;
    white-space: nowrap;
    transform: rotate(-25deg);
}

.growth-feature-grid {
    align-items: start;
}

.paper-controls {
    display: grid;
    grid-template-columns: 1.1fr 1.4fr 0.8fr;
    gap: 8px;
}

.paper-controls input,
.paper-controls select {
    width: 100%;
    padding: 10px 11px;
    border: 1px solid rgba(99,102,241,0.18);
    border-radius: 10px;
    background: rgba(255,255,255,0.68);
    color: #252a50;
    font: inherit;
    outline: none;
}

.paper-controls .growth-primary {
    grid-column: 1 / -1;
    margin-top: 2px;
}

.paper-workspace {
    margin-top: 14px;
}

.paper-summary,
.paper-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 12px;
    border-radius: 12px;
    background: rgba(34,193,195,0.1);
    border: 1px solid rgba(34,193,195,0.16);
}

.paper-summary strong,
.paper-result strong {
    color: #252a50;
    font-size: 14px;
}

.paper-summary span,
.paper-result span {
    color: #69708a;
    font-size: 11px;
    text-align: right;
}

.paper-result strong {
    color: #4f46e5;
    font-size: 25px;
}

.paper-question {
    margin-top: 10px;
    padding: 13px;
    border-radius: 12px;
    background: rgba(255,255,255,0.54);
    border: 1px solid rgba(99,102,241,0.1);
}

.paper-question-head,
.review-item-head,
.paper-result-item > div {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.paper-question-head b {
    color: #4f46e5;
}

.paper-question-head span,
.review-item-head span,
.paper-result-item span {
    color: #7c8298;
    font-size: 10px;
}

.paper-question > p,
.review-item > p,
.paper-result-item p {
    margin-top: 7px;
    color: #343a5e;
    font-size: 12px;
    line-height: 1.65;
    white-space: pre-wrap;
}

.paper-question textarea {
    width: 100%;
    min-height: 62px;
    margin-top: 10px;
    padding: 9px 10px;
    resize: vertical;
    border: 1px solid rgba(99,102,241,0.18);
    border-radius: 9px;
    background: #fff;
    color: #252a50;
    font: inherit;
    outline: none;
}

.paper-options {
    display: grid;
    gap: 7px;
    margin-top: 10px;
}

.paper-options label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 9px;
    border-radius: 9px;
    background: rgba(99,102,241,0.06);
    color: #343a5e;
    font-size: 12px;
    cursor: pointer;
}

.paper-options input {
    margin-top: 2px;
}

.paper-result-item {
    margin-top: 9px;
    padding: 11px 12px;
    border-radius: 11px;
    background: rgba(16,185,129,0.07);
    border-left: 3px solid #10b981;
}

.paper-result-item.wrong {
    background: rgba(239,68,68,0.07);
    border-left-color: #ef4444;
}

.review-list {
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.review-item {
    padding: 12px;
    border-radius: 12px;
    background: rgba(99,102,241,0.07);
    border: 1px solid rgba(99,102,241,0.1);
}

.review-item details {
    margin-top: 8px;
    color: #69708a;
    font-size: 11px;
}

.review-item summary {
    cursor: pointer;
    color: #4f46e5;
    font-weight: 800;
}

.review-actions {
    display: flex;
    gap: 7px;
    margin-top: 10px;
}

.review-actions button {
    padding: 7px 10px;
    border: 1px solid rgba(16,185,129,0.22);
    border-radius: 8px;
    background: rgba(16,185,129,0.1);
    color: #047857;
    font-size: 11px;
    font-weight: 800;
    cursor: pointer;
}

.review-actions button.secondary {
    border-color: rgba(245,158,11,0.25);
    background: rgba(245,158,11,0.1);
    color: #b45309;
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 9px;
}

.achievement-item {
    display: flex;
    gap: 10px;
    padding: 12px;
    border-radius: 12px;
    background: rgba(99,102,241,0.055);
    border: 1px solid rgba(99,102,241,0.09);
    opacity: 0.62;
}

.achievement-item.unlocked {
    background: rgba(16,185,129,0.08);
    border-color: rgba(16,185,129,0.18);
    opacity: 1;
}

.achievement-mark {
    width: 25px;
    height: 25px;
    flex: 0 0 25px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: rgba(99,102,241,0.13);
    color: #4f46e5;
    font-weight: 900;
}

.achievement-item.unlocked .achievement-mark {
    background: #10b981;
    color: #fff;
}

.achievement-item strong {
    color: #2c3157;
    font-size: 12px;
}

.achievement-item p {
    margin-top: 3px;
    color: #7a8097;
    font-size: 10px;
    line-height: 1.45;
}

.achievement-progress {
    height: 4px;
    margin-top: 7px;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(99,102,241,0.12);
}

.achievement-progress i {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: #6366f1;
}

@media (max-width: 720px) {
    .growth-grid,
    .subject-progress-grid,
    .learning-stat-grid,
    .achievement-grid {
        grid-template-columns: 1fr;
    }

    .learning-stat-grid,
    .achievement-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .paper-controls {
        grid-template-columns: 1fr;
    }

    .paper-controls .growth-primary {
        grid-column: auto;
    }

    .growth-hero {
        align-items: flex-start;
        padding: 21px;
    }

    .growth-time-ring {
        width: 92px;
        height: 92px;
        flex-basis: 92px;
    }

    .textbook-filters {
        grid-template-columns: 1fr;
    }
}