/* =====================================================
   Science Explorer Design System
   統一設計語言 - 科學閱讀App
   Version: 2.0
   ===================================================== */

/* =====================================================
   1. CSS Custom Properties - 設計令牌
   ===================================================== */

:root {
    /* === 品牌色彩 === */
    --brand-primary: #667eea;
    --brand-secondary: #764ba2;
    --brand-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --brand-gradient-vibrant: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);

    /* === 語意色彩 === */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* === 遊戲化霓虹色 (用於深色主題強調) === */
    --neon-cyan: #00d4ff;
    --neon-purple: #b24bf3;
    --neon-pink: #ff006e;
    --neon-green: #00ff88;
    --neon-orange: #ff9500;
    --neon-yellow: #ffdd00;

    /* === 中性色階 (亮色主題) === */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;

    /* === 亮色主題預設值 === */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-elevated: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.5);

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;

    --border-light: rgba(0, 0, 0, 0.06);
    --border-medium: rgba(0, 0, 0, 0.1);
    --border-strong: rgba(0, 0, 0, 0.15);

    /* === 玻璃效果 === */
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-bg-strong: rgba(255, 255, 255, 0.92);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);

    /* === 陰影系統 === */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
    --shadow-glow-strong: 0 0 40px rgba(102, 126, 234, 0.5);

    /* === 間距系統 === */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* === 圓角系統 === */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    --radius-full: 9999px;

    /* === 字體系統 === */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
    --font-display: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Monaco', monospace;

    /* === 字體大小 === */
    --text-xs: 0.75rem;    /* 12px */
    --text-sm: 0.875rem;   /* 14px */
    --text-base: 1rem;     /* 16px */
    --text-lg: 1.125rem;   /* 18px */
    --text-xl: 1.25rem;    /* 20px */
    --text-2xl: 1.5rem;    /* 24px */
    --text-3xl: 1.875rem;  /* 30px */
    --text-4xl: 2.25rem;   /* 36px */
    --text-5xl: 3rem;      /* 48px */

    /* === 字重 === */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* === 行高 === */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* === 動畫 === */
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;

    /* === 層級 === */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

/* =====================================================
   2. 深色主題 (遊戲化頁面)
   ===================================================== */

[data-theme="dark"],
.theme-dark {
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-tertiary: #1a1a3a;
    --bg-elevated: rgba(20, 20, 50, 0.9);
    --bg-overlay: rgba(0, 0, 0, 0.7);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --text-inverse: #1e293b;

    --border-light: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.15);

    --glass-bg: rgba(20, 20, 50, 0.8);
    --glass-bg-strong: rgba(20, 20, 50, 0.95);
    --glass-border: rgba(102, 126, 234, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    --shadow-glow-strong: 0 0 40px rgba(0, 212, 255, 0.5);
}

/* =====================================================
   3. 基礎重置與全域樣式
   ===================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

/* =====================================================
   4. 統一卡片元件
   ===================================================== */

.se-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--duration-normal) var(--ease-out),
                box-shadow var(--duration-normal) var(--ease-out);
}

.se-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.se-card-glass {
    background: var(--glass-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.se-card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.se-card-body {
    padding: var(--space-6);
}

.se-card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-light);
    background: var(--bg-tertiary);
}

/* 特殊卡片樣式 */
.se-card-featured {
    background: var(--brand-gradient);
    color: var(--text-inverse);
    border: none;
}

.se-card-featured .se-card-header,
.se-card-featured .se-card-footer {
    border-color: rgba(255, 255, 255, 0.2);
    background: transparent;
}

/* 遊戲化卡片 (深色主題) */
.se-card-game {
    background: var(--bg-elevated);
    border: 2px solid var(--glass-border);
    position: relative;
}

.se-card-game::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
}

.se-card-game:hover {
    border-color: var(--neon-cyan);
    box-shadow: var(--shadow-glow);
}

/* =====================================================
   5. 統一按鈕元件
   ===================================================== */

.se-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    white-space: nowrap;
}

.se-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 主要按鈕 */
.se-btn-primary {
    background: var(--brand-gradient);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.35);
}

.se-btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.45);
}

.se-btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* 次要按鈕 */
.se-btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

.se-btn-secondary:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

/* 幽靈按鈕 */
.se-btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.se-btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 霓虹按鈕 (遊戲化) */
.se-btn-neon {
    background: transparent;
    color: var(--neon-cyan);
    border: 2px solid var(--neon-cyan);
    text-shadow: 0 0 10px var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.3),
                inset 0 0 10px rgba(0, 212, 255, 0.1);
}

.se-btn-neon:hover:not(:disabled) {
    background: var(--neon-cyan);
    color: var(--bg-primary);
    text-shadow: none;
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

/* 成功按鈕 */
.se-btn-success {
    background: var(--color-success);
    color: #ffffff;
}

.se-btn-success:hover:not(:disabled) {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

/* 危險按鈕 */
.se-btn-danger {
    background: var(--color-danger);
    color: #ffffff;
}

.se-btn-danger:hover:not(:disabled) {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

/* 按鈕尺寸 */
.se-btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

.se-btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
}

.se-btn-xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
    border-radius: var(--radius-xl);
}

/* 圖標按鈕 */
.se-btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
}

.se-btn-icon.se-btn-sm {
    width: 32px;
    height: 32px;
}

.se-btn-icon.se-btn-lg {
    width: 48px;
    height: 48px;
}

/* =====================================================
   6. 統一徽章元件
   ===================================================== */

.se-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    line-height: 1.4;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.se-badge-primary {
    background: rgba(102, 126, 234, 0.15);
    color: var(--brand-primary);
}

.se-badge-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--color-success);
}

.se-badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-warning);
}

.se-badge-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-danger);
}

.se-badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--color-info);
}

/* 遊戲化徽章 */
.se-badge-neon {
    background: rgba(0, 212, 255, 0.15);
    color: var(--neon-cyan);
    border: 1px solid rgba(0, 212, 255, 0.3);
    text-shadow: 0 0 8px var(--neon-cyan);
}

/* 稀有度徽章 */
.se-badge-common {
    background: rgba(115, 115, 115, 0.2);
    color: var(--gray-500);
}

.se-badge-rare {
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
}

.se-badge-epic {
    background: rgba(139, 92, 246, 0.2);
    color: #8b5cf6;
}

.se-badge-legendary {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(239, 68, 68, 0.3));
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.5);
}

/* =====================================================
   7. 統一進度條
   ===================================================== */

.se-progress {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.se-progress-bar {
    height: 100%;
    background: var(--brand-gradient);
    border-radius: var(--radius-full);
    transition: width var(--duration-slow) var(--ease-out);
}

.se-progress-success .se-progress-bar {
    background: var(--color-success);
}

.se-progress-warning .se-progress-bar {
    background: var(--color-warning);
}

.se-progress-danger .se-progress-bar {
    background: var(--color-danger);
}

/* 霓虹進度條 */
.se-progress-neon {
    background: rgba(255, 255, 255, 0.1);
}

.se-progress-neon .se-progress-bar {
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
    box-shadow: 0 0 10px var(--neon-cyan);
}

/* =====================================================
   8. 統一表單元件
   ===================================================== */

.se-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    transition: border-color var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-fast) var(--ease-out);
}

.se-input:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.se-input::placeholder {
    color: var(--text-tertiary);
}

.se-input:disabled {
    background: var(--bg-tertiary);
    cursor: not-allowed;
}

/* 標籤 */
.se-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

/* 幫助文字 */
.se-help-text {
    margin-top: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

/* =====================================================
   9. 統一版面容器
   ===================================================== */

.se-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.se-container-sm {
    max-width: 640px;
}

.se-container-md {
    max-width: 768px;
}

.se-container-lg {
    max-width: 1024px;
}

.se-container-xl {
    max-width: 1280px;
}

.se-container-full {
    max-width: none;
}

/* =====================================================
   10. 頁面區塊
   ===================================================== */

/* 頁面標題區 */
.se-page-header {
    padding: var(--space-10) 0;
    text-align: center;
}

.se-page-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.se-page-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
}

/* Hero 區塊 */
.se-hero {
    background: var(--brand-gradient-vibrant);
    padding: var(--space-12) var(--space-6);
    position: relative;
    overflow: hidden;
}

.se-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 50%);
    animation: heroFloat 20s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(3%, 3%) scale(1.05); }
}

.se-hero-content {
    position: relative;
    z-index: 2;
    color: #ffffff;
}

/* 深色主題 Hero */
.se-hero-dark {
    background: linear-gradient(135deg, #0a0a1a 0%, #1a1a3a 50%, #0f0f2f 100%);
}

.se-hero-dark::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.4), transparent);
    background-size: 200px 100px;
    animation: twinkle 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* =====================================================
   11. 網格系統
   ===================================================== */

.se-grid {
    display: grid;
    gap: var(--space-6);
}

.se-grid-2 { grid-template-columns: repeat(2, 1fr); }
.se-grid-3 { grid-template-columns: repeat(3, 1fr); }
.se-grid-4 { grid-template-columns: repeat(4, 1fr); }

.se-grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.se-grid-auto-fill {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

@media (max-width: 768px) {
    .se-grid-2,
    .se-grid-3,
    .se-grid-4 {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .se-grid-3,
    .se-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* =====================================================
   12. 統一動畫效果
   ===================================================== */

/* 淡入 */
.se-fade-in {
    animation: seFadeIn var(--duration-normal) var(--ease-out);
}

@keyframes seFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 向上滑入 */
.se-slide-up {
    animation: seSlideUp var(--duration-normal) var(--ease-out);
}

@keyframes seSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 縮放進入 */
.se-scale-in {
    animation: seScaleIn var(--duration-normal) var(--ease-spring);
}

@keyframes seScaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 脈動效果 */
.se-pulse {
    animation: sePulse 2s ease-in-out infinite;
}

@keyframes sePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* 霓虹發光 */
.se-glow {
    animation: seGlow 2s ease-in-out infinite alternate;
}

@keyframes seGlow {
    from { box-shadow: 0 0 5px var(--neon-cyan), 0 0 10px var(--neon-cyan); }
    to { box-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan), 0 0 30px var(--neon-cyan); }
}

/* 交錯動畫延遲 */
.se-stagger-1 { animation-delay: 0.05s; }
.se-stagger-2 { animation-delay: 0.1s; }
.se-stagger-3 { animation-delay: 0.15s; }
.se-stagger-4 { animation-delay: 0.2s; }
.se-stagger-5 { animation-delay: 0.25s; }
.se-stagger-6 { animation-delay: 0.3s; }

/* =====================================================
   13. 工具類別
   ===================================================== */

/* 文字對齊 */
.se-text-left { text-align: left; }
.se-text-center { text-align: center; }
.se-text-right { text-align: right; }

/* 文字顏色 */
.se-text-primary { color: var(--text-primary); }
.se-text-secondary { color: var(--text-secondary); }
.se-text-brand { color: var(--brand-primary); }
.se-text-success { color: var(--color-success); }
.se-text-warning { color: var(--color-warning); }
.se-text-danger { color: var(--color-danger); }

/* 背景 */
.se-bg-primary { background: var(--bg-primary); }
.se-bg-secondary { background: var(--bg-secondary); }
.se-bg-brand { background: var(--brand-gradient); }

/* Flex 工具 */
.se-flex { display: flex; }
.se-flex-center { display: flex; align-items: center; justify-content: center; }
.se-flex-between { display: flex; align-items: center; justify-content: space-between; }
.se-flex-col { display: flex; flex-direction: column; }
.se-gap-2 { gap: var(--space-2); }
.se-gap-4 { gap: var(--space-4); }
.se-gap-6 { gap: var(--space-6); }

/* 間距工具 */
.se-mt-4 { margin-top: var(--space-4); }
.se-mt-6 { margin-top: var(--space-6); }
.se-mt-8 { margin-top: var(--space-8); }
.se-mb-4 { margin-bottom: var(--space-4); }
.se-mb-6 { margin-bottom: var(--space-6); }
.se-mb-8 { margin-bottom: var(--space-8); }
.se-p-4 { padding: var(--space-4); }
.se-p-6 { padding: var(--space-6); }

/* =====================================================
   14. 響應式工具
   ===================================================== */

@media (max-width: 576px) {
    :root {
        --text-3xl: 1.5rem;
        --text-4xl: 1.875rem;
        --text-5xl: 2.25rem;
    }

    .se-container {
        padding: 0 var(--space-4);
    }

    .se-hide-mobile { display: none !important; }
}

@media (min-width: 577px) {
    .se-hide-desktop { display: none !important; }
}

/* =====================================================
   15. 統一頁面主題類別
   ===================================================== */

/* 亮色主題頁面容器 */
.se-page-light {
    background: var(--bg-secondary);
    min-height: 100vh;
}

/* 深色主題頁面容器 */
.se-page-dark {
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-tertiary: #1a1a3a;
    --bg-elevated: rgba(20, 20, 50, 0.9);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --border-light: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(20, 20, 50, 0.8);
    --glass-border: rgba(102, 126, 234, 0.3);

    background: linear-gradient(135deg, #0a0a1a 0%, #1a1a3a 50%, #0f0f2f 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

/* 確保導航列在深色頁面保持正確樣式 */
.se-page-dark .apple-nav {
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
}

.se-page-dark .apple-nav .nav-link {
    color: #1d1d1f !important;
}

.se-page-dark .apple-nav .nav-link:hover {
    color: #667eea !important;
}

.se-page-dark .apple-nav .brand-text {
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =====================================================
   16. 統計卡片
   ===================================================== */

.se-stat-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    border: 1px solid var(--border-light);
    text-align: center;
}

.se-stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
}

.se-stat-value {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.se-stat-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* 霓虹統計卡片 */
.se-stat-card-neon {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
}

.se-stat-card-neon .se-stat-value {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =====================================================
   17. 列表元件
   ===================================================== */

.se-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.se-list-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--duration-fast) var(--ease-out);
}

.se-list-item:last-child {
    border-bottom: none;
}

.se-list-item:hover {
    background: var(--bg-tertiary);
}

.se-list-item-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.se-list-item-content {
    flex: 1;
    min-width: 0;
}

.se-list-item-title {
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

.se-list-item-subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* =====================================================
   18. 空狀態
   ===================================================== */

.se-empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-6);
}

.se-empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.se-empty-state-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.se-empty-state-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

/* =====================================================
   19. Science Detective OS v3
   全站 UI 進化覆蓋層 - 保留舊 class，相容 Flask/Jinja 頁面
   ===================================================== */

:root {
    --sd-bg: #07111f;
    --sd-bg-2: #0b1727;
    --sd-bg-3: #102238;
    --sd-surface: rgba(13, 27, 45, 0.88);
    --sd-surface-strong: rgba(18, 36, 58, 0.96);
    --sd-surface-soft: rgba(255, 255, 255, 0.06);
    --sd-paper: #f7f3e8;
    --sd-paper-ink: #20242f;
    --sd-line: rgba(148, 210, 199, 0.22);
    --sd-line-strong: rgba(148, 210, 199, 0.38);
    --sd-text: #edf7f7;
    --sd-text-soft: rgba(237, 247, 247, 0.76);
    --sd-muted: rgba(237, 247, 247, 0.56);
    --sd-science: #42d9c8;
    --sd-evidence: #ffbf5a;
    --sd-evidence-2: #ff8f3d;
    --sd-success: #80e18b;
    --sd-danger: #ff6f7d;
    --sd-blueprint: rgba(66, 217, 200, 0.08);
    --sd-shadow: 0 18px 50px rgba(0, 0, 0, 0.34);
    --sd-shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.18);
    --sd-radius-sm: 8px;
    --sd-radius: 12px;
    --sd-radius-lg: 18px;
    --sd-radius-xl: 24px;
    --sd-nav-height: 64px;
    --sd-page-max: 1180px;
    --sd-font: "Plus Jakarta Sans", "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    --brand-primary: var(--sd-science);
    --brand-secondary: var(--sd-evidence);
    --brand-gradient: linear-gradient(135deg, var(--sd-science), var(--sd-evidence));
    --radius-sm: var(--sd-radius-sm);
    --radius-md: var(--sd-radius);
    --radius-lg: var(--sd-radius-lg);
    --radius-xl: var(--sd-radius-lg);
    --font-sans: var(--sd-font);
}

html {
    scroll-padding-top: calc(var(--sd-nav-height) + 20px);
}

body {
    font-family: var(--sd-font);
    background:
        linear-gradient(rgba(87, 199, 190, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(87, 199, 190, 0.035) 1px, transparent 1px),
        radial-gradient(circle at 18% -10%, rgba(66, 217, 200, 0.14), transparent 34rem),
        radial-gradient(circle at 82% 4%, rgba(255, 191, 90, 0.12), transparent 30rem),
        var(--sd-bg);
    background-size: 44px 44px, 44px 44px, auto, auto, auto;
    color: var(--sd-text);
}

main.container {
    max-width: var(--sd-page-max);
}

.apple-nav {
    --glass-bg: rgba(7, 17, 31, 0.86);
    --glass-border: rgba(148, 210, 199, 0.22);
    --glass-shadow: 0 14px 38px rgba(0, 0, 0, 0.26);
    --accent-gradient: linear-gradient(135deg, var(--sd-science), var(--sd-evidence));
    --accent-primary: var(--sd-science);
    --accent-secondary: var(--sd-evidence);
    --text-primary: var(--sd-text);
    --text-secondary: var(--sd-text-soft);
    --hover-bg: rgba(66, 217, 200, 0.10);
}

.apple-nav.scrolled {
    background: rgba(7, 17, 31, 0.94) !important;
    border-bottom-color: rgba(148, 210, 199, 0.28);
}

.nav-brand .brand-icon {
    background:
        radial-gradient(circle at 38% 28%, rgba(135, 255, 241, 0.35), transparent 38%),
        linear-gradient(145deg, #12304b, #071827 58%, #101f38);
    color: #eafffb;
    border-radius: 14px;
    overflow: hidden;
    padding: 2px;
    box-shadow:
        0 0 0 1px rgba(121, 255, 241, 0.36),
        0 12px 28px rgba(66, 217, 200, 0.22),
        inset 0 1px 0 rgba(255, 255, 255, 0.20);
}

.nav-brand .brand-icon-img {
    display: block;
    height: 100%;
    width: 100%;
}

.brand-text {
    background: none !important;
    -webkit-text-fill-color: currentColor !important;
    color: var(--sd-text) !important;
    letter-spacing: 0;
}

.nav-link,
.dropdown-item-apple,
.btn-login,
.btn-register {
    border-radius: var(--sd-radius-sm) !important;
}

.nav-link:hover,
.dropdown-item-apple:hover {
    background: rgba(66, 217, 200, 0.12) !important;
    color: var(--sd-science) !important;
}

.dropdown-menu-apple {
    background: rgba(9, 20, 34, 0.98) !important;
    border: 1px solid var(--sd-line) !important;
    box-shadow: var(--sd-shadow) !important;
}

.dropdown-header-apple,
.dropdown-item-apple,
.dropdown-divider-apple {
    color: var(--sd-text-soft) !important;
    border-color: rgba(148, 210, 199, 0.16) !important;
}

.btn-register,
.btn-login:hover,
.btn-primary,
.apple-btn-primary,
.hero-btn.primary,
.product-btn.primary {
    background: linear-gradient(135deg, var(--sd-evidence), var(--sd-evidence-2)) !important;
    border-color: transparent !important;
    color: #142131 !important;
    box-shadow: 0 12px 28px rgba(255, 191, 90, 0.20) !important;
    font-weight: 800;
}

.btn-primary:hover,
.apple-btn-primary:hover,
.hero-btn.primary:hover,
.product-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 34px rgba(255, 191, 90, 0.26) !important;
}

.btn-outline-primary,
.btn-outline-secondary,
.btn-login,
.hero-btn.secondary,
.product-btn.secondary {
    color: var(--sd-text) !important;
    border-color: var(--sd-line-strong) !important;
    background: rgba(255, 255, 255, 0.055) !important;
}

.btn-outline-primary:hover,
.btn-outline-secondary:hover,
.btn-login:hover,
.hero-btn.secondary:hover,
.product-btn.secondary:hover {
    color: var(--sd-science) !important;
    border-color: rgba(66, 217, 200, 0.55) !important;
    background: rgba(66, 217, 200, 0.12) !important;
}

.card,
.se-card,
.alert,
.list-group-item,
.modal-content,
.accordion-item,
.dropdown-menu,
.table-responsive {
    border-radius: var(--sd-radius) !important;
}

body:not(.game-shell-root) .card,
body:not(.game-shell-root) .se-card,
body:not(.game-shell-root) .modal-content,
body:not(.game-shell-root) .table-responsive {
    border: 1px solid rgba(20, 41, 65, 0.12);
    box-shadow: var(--sd-shadow-soft);
}

.form-control,
.form-select,
.input-group-text,
.apple-input,
.apple-select,
textarea {
    border-radius: var(--sd-radius-sm) !important;
}

.badge,
.chip,
.badge-chip,
.stat-badge,
.question-meta-chip,
.report-meta-chip {
    border-radius: 999px !important;
    letter-spacing: 0.02em;
}

.table {
    --bs-table-bg: transparent;
    --bs-table-striped-bg: rgba(66, 217, 200, 0.045);
    --bs-table-hover-bg: rgba(255, 191, 90, 0.075);
    color: inherit;
}

.table thead th {
    color: #496171;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border-bottom-color: rgba(20, 41, 65, 0.14);
}

.table td,
.table th {
    vertical-align: middle;
}

.science-detective-public,
.science-detective-page,
.product-page,
.game-home {
    color: var(--sd-text);
    background:
        linear-gradient(rgba(87, 199, 190, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(87, 199, 190, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 18% 8%, rgba(66, 217, 200, 0.18), transparent 34rem),
        radial-gradient(circle at 82% 10%, rgba(255, 191, 90, 0.14), transparent 30rem),
        linear-gradient(180deg, #07111f 0%, #0a1728 58%, #eef4f2 58%, #eef4f2 100%) !important;
}

body.science-detective-public {
    background: #07111f;
    color: var(--sd-text);
}

body.science-detective-public main.container {
    max-width: none;
    width: 100%;
    padding-left: 0;
    padding-right: 0;
}

body.science-detective-public .game-home,
body.science-detective-public .product-page {
    margin: -1.5rem 0 0 !important;
    min-height: calc(100vh - var(--sd-nav-height));
}

.hero-section,
.welcome-header,
.product-hero {
    background:
        linear-gradient(rgba(66, 217, 200, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(66, 217, 200, 0.08) 1px, transparent 1px),
        radial-gradient(circle at 78% 16%, rgba(255, 191, 90, 0.22), transparent 20rem),
        radial-gradient(circle at 22% 14%, rgba(66, 217, 200, 0.20), transparent 24rem),
        #07111f !important;
    background-size: 46px 46px, 46px 46px, auto, auto, auto !important;
    border-bottom: 1px solid var(--sd-line);
}

.hero-section::before,
.product-hero::before {
    content: "";
    position: absolute;
    inset: auto 6% 8% auto;
    width: min(42vw, 520px);
    aspect-ratio: 1.35;
    border: 1px solid rgba(148, 210, 199, 0.22);
    border-radius: var(--sd-radius-xl);
    background:
        linear-gradient(135deg, rgba(7, 17, 31, 0.18), rgba(7, 17, 31, 0.78)),
        radial-gradient(circle at 72% 28%, rgba(255, 191, 90, 0.22), transparent 20%),
        radial-gradient(circle at 38% 40%, rgba(66, 217, 200, 0.22), transparent 25%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.015));
    box-shadow: var(--sd-shadow);
    opacity: 0.95;
}

.hero-section::after,
.product-hero::after {
    content: "";
    position: absolute;
    inset: 22% 12% auto auto;
    width: min(26vw, 320px);
    aspect-ratio: 1;
    border-radius: 50%;
    background:
        radial-gradient(circle, rgba(66, 217, 200, 0.12) 0 34%, transparent 35%),
        conic-gradient(from 90deg, rgba(255, 191, 90, 0.88), rgba(66, 217, 200, 0.88), rgba(255, 191, 90, 0.88));
    -webkit-mask: radial-gradient(circle, transparent 0 48%, #000 49%);
    mask: radial-gradient(circle, transparent 0 48%, #000 49%);
    opacity: 0.8;
}

.hero-title,
.product-title,
.welcome-title {
    color: var(--sd-text) !important;
    letter-spacing: 0 !important;
    text-wrap: balance;
}

.hero-subtitle,
.product-copy,
.welcome-subtitle {
    color: var(--sd-text-soft) !important;
}

.feature-card,
.proof-item,
.trial-form,
.apple-auth-card {
    background: rgba(10, 23, 40, 0.88) !important;
    border: 1px solid var(--sd-line) !important;
    color: var(--sd-text) !important;
    box-shadow: var(--sd-shadow) !important;
}

.feature-title,
.apple-title {
    color: var(--sd-text) !important;
}

.feature-desc,
.apple-subtitle,
.apple-link,
.apple-helper-text {
    color: var(--sd-text-soft) !important;
}

.apple-label {
    color: var(--sd-text) !important;
}

.apple-input,
.apple-select {
    background: rgba(255, 255, 255, 0.07) !important;
    border-color: var(--sd-line) !important;
    color: var(--sd-text) !important;
}

.apple-input:focus,
.apple-select:focus {
    border-color: rgba(66, 217, 200, 0.75) !important;
    box-shadow: 0 0 0 4px rgba(66, 217, 200, 0.14) !important;
}

body:has(.apple-auth-container) {
    background:
        radial-gradient(circle at 20% 10%, rgba(66, 217, 200, 0.18), transparent 26rem),
        radial-gradient(circle at 82% 16%, rgba(255, 191, 90, 0.18), transparent 24rem),
        linear-gradient(135deg, #07111f, #0d2238 55%, #07111f) !important;
    padding-top: 0 !important;
}

body:has(.apple-auth-container) .apple-nav,
body:has(.apple-auth-container) .mobile-bottom-nav,
body:has(.apple-auth-container) footer {
    display: none !important;
}

.apple-auth-card {
    max-width: 460px !important;
}

.apple-logo-icon {
    background: linear-gradient(135deg, var(--sd-science), var(--sd-evidence)) !important;
    color: #07111f;
}

.admin-sidebar {
    background:
        linear-gradient(rgba(66, 217, 200, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(66, 217, 200, 0.045) 1px, transparent 1px),
        linear-gradient(180deg, #07111f 0%, #102238 100%) !important;
    background-size: 36px 36px, 36px 36px, auto !important;
    border-right: 1px solid var(--sd-line);
}

.admin-sidebar .nav-link {
    border-radius: var(--sd-radius-sm) !important;
    margin: 0 0.75rem 0.25rem;
}

.admin-sidebar .nav-link.active {
    background: rgba(66, 217, 200, 0.16) !important;
    color: var(--sd-science) !important;
    box-shadow: inset 3px 0 0 var(--sd-evidence);
}

.admin-content {
    background: #eef4f2 !important;
    color: #142131;
}

.admin-content .card,
.container .card,
.container-fluid .card {
    border: 1px solid rgba(16, 34, 56, 0.10);
}

.teacher-command-page,
body.teacher-console-page,
body.admin-console-page,
body:has(.teacher-console),
body:has(#createModeContent),
body:has(.admin-content) {
    background: #eef4f2;
    color: #142131;
}

.teacher-console {
    color: #142131;
}

.teacher-console-hero {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1.25rem;
    padding: clamp(1.4rem, 3vw, 2rem);
    border: 1px solid rgba(16, 34, 56, 0.12);
    border-radius: var(--sd-radius-lg);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.76)),
        radial-gradient(circle at 90% 12%, rgba(66, 217, 200, 0.18), transparent 20rem);
    box-shadow: 0 16px 44px rgba(16, 34, 56, 0.10);
}

.teacher-console-hero h1 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 880;
    letter-spacing: 0;
    color: #102238;
}

.teacher-console-hero p {
    max-width: 680px;
    margin: 0.55rem 0 0;
    color: #496171;
}

.teacher-console-kicker {
    margin: 0 0 0.35rem !important;
    color: #1d8f86 !important;
    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.teacher-console .table-responsive {
    background: #fff;
    border: 1px solid rgba(16, 34, 56, 0.10);
    box-shadow: 0 16px 44px rgba(16, 34, 56, 0.08);
}

.teacher-console .alert {
    border: 1px solid rgba(29, 143, 134, 0.18);
    background: rgba(66, 217, 200, 0.10);
    color: #27495a;
}

@media (max-width: 767.98px) {
    .teacher-console-hero {
        align-items: stretch;
        flex-direction: column;
    }
}

.container > .row:first-child h1,
.container > .row:first-child h2,
.container > .d-flex:first-child h1,
.container > .d-flex:first-child h2,
.admin-content h1,
.admin-content h2 {
    font-weight: 850;
    letter-spacing: 0;
}

.nav-tabs {
    border-bottom: 1px solid rgba(16, 34, 56, 0.12);
    gap: 0.35rem;
}

.nav-tabs .nav-link {
    border: 1px solid transparent;
    border-radius: var(--sd-radius-sm) var(--sd-radius-sm) 0 0 !important;
    color: #496171;
    font-weight: 750;
}

.nav-tabs .nav-link.active {
    background: #ffffff;
    border-color: rgba(16, 34, 56, 0.12);
    color: #102238;
    box-shadow: 0 -4px 18px rgba(16, 34, 56, 0.06);
}

.mobile-bottom-nav {
    background: rgba(7, 17, 31, 0.94) !important;
    border-top: 1px solid var(--sd-line) !important;
    box-shadow: 0 -16px 40px rgba(0, 0, 0, 0.30) !important;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.mobile-bottom-nav .mobile-nav-item,
.mobile-bottom-nav a {
    color: var(--sd-text-soft) !important;
}

.mobile-bottom-nav .mobile-nav-item.active,
.mobile-bottom-nav a.active,
.mobile-bottom-nav .mobile-nav-item:hover,
.mobile-bottom-nav a:hover {
    color: var(--sd-evidence) !important;
}

body.has-bottom-nav main {
    padding-bottom: calc(88px + env(safe-area-inset-bottom));
}

@media (max-width: 991.98px) {
    .hero-section,
    .product-hero {
        min-height: auto !important;
        padding: 4.5rem 1.1rem 3rem !important;
        text-align: left !important;
    }

    .hero-section::before,
    .product-hero::before,
    .hero-section::after,
    .product-hero::after {
        display: none;
    }

    .hero-title,
    .product-title {
        font-size: clamp(2.3rem, 13vw, 4rem) !important;
        line-height: 1.02 !important;
    }

    .feature-grid,
    .section-grid,
    .proof-line {
        grid-template-columns: 1fr !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-section::before,
    .product-hero::before,
    .hero-section::after,
    .product-hero::after {
        animation: none !important;
    }
}

/* =====================================================
   20. Nav contrast patch - 20260509-nav-layout-fix
   固定全站導覽列可讀性，避免頁面主題覆蓋文字色
   ===================================================== */

:root {
    --sd-nav-bg-solid: rgba(5, 13, 24, 0.96);
    --sd-nav-bg-hover: rgba(66, 217, 200, 0.18);
    --sd-nav-text: #f7ffff;
    --sd-nav-text-muted: #c9dcdf;
    --sd-nav-icon: #ffcf75;
}

.apple-nav,
body.game-shell-root .apple-nav,
body.science-detective-public .apple-nav,
body.teacher-console-page .apple-nav,
body.admin-console-page .apple-nav {
    background: var(--sd-nav-bg-solid) !important;
    border-bottom: 1px solid rgba(148, 210, 199, 0.36) !important;
    box-shadow: 0 12px 34px rgba(0, 0, 0, 0.38) !important;
    color: var(--sd-nav-text) !important;
    --glass-bg: var(--sd-nav-bg-solid);
    --glass-border: rgba(148, 210, 199, 0.36);
    --text-primary: var(--sd-nav-text);
    --text-secondary: var(--sd-nav-text-muted);
    --hover-bg: var(--sd-nav-bg-hover);
}

.apple-nav.scrolled,
body.game-shell-root .apple-nav.scrolled {
    background: rgba(5, 13, 24, 0.985) !important;
}

.apple-nav .brand-text,
body.game-shell-root .apple-nav .brand-text,
.apple-nav .nav-link,
.apple-nav .dropdown-trigger,
.apple-nav .dropdown-item-apple,
.apple-nav .btn-login {
    color: var(--sd-nav-text) !important;
    -webkit-text-fill-color: currentColor !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.42);
}

.apple-nav .nav-link {
    position: relative;
    border: 1px solid transparent;
    font-weight: 750;
}

.apple-nav .nav-link .nav-icon,
.apple-nav .dropdown-item-apple .item-icon {
    color: var(--sd-nav-icon) !important;
    filter: saturate(1.12) brightness(1.12);
}

.apple-nav .nav-link:hover,
.apple-nav .nav-link:focus-visible,
.apple-nav .nav-dropdown:hover > .nav-link,
.apple-nav .dropdown-item-apple:hover,
.apple-nav .dropdown-item-apple:focus-visible {
    background: var(--sd-nav-bg-hover) !important;
    border-color: rgba(66, 217, 200, 0.46) !important;
    color: #ffffff !important;
}

.apple-nav .nav-link:hover::after,
.apple-nav .nav-link:focus-visible::after,
.apple-nav .nav-dropdown:hover > .nav-link::after {
    background: var(--sd-science);
    border-radius: 999px;
    bottom: 4px;
    content: "";
    height: 3px;
    left: 14px;
    opacity: 1;
    position: absolute;
    right: 14px;
}

.apple-nav .dropdown-trigger::after {
    border-top-color: var(--sd-nav-text-muted) !important;
}

.apple-nav .dropdown-menu-apple {
    background: rgba(5, 13, 24, 0.99) !important;
    border: 1px solid rgba(148, 210, 199, 0.36) !important;
}

.apple-nav .dropdown-header-apple {
    color: #91f2e8 !important;
}

.apple-nav .dropdown-divider-apple {
    border-color: rgba(148, 210, 199, 0.20) !important;
}

.apple-nav .btn-register {
    color: #101827 !important;
    text-shadow: none !important;
}

.mobile-bottom-nav .nav-link,
.mobile-bottom-nav .mobile-nav-item {
    color: #dbecef !important;
}

.mobile-bottom-nav .nav-link.active,
.mobile-bottom-nav .mobile-nav-item.active {
    color: #ffcf75 !important;
}

/* =====================================================
   21. Teacher one-click builder - 20260510-teacher-easy-create
   老師端出題降壓：主流程短、進階設定收合
   ===================================================== */

.teacher-quick-steps {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.teacher-quick-step {
    align-items: flex-start;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(238, 251, 248, 0.96));
    border: 1px solid rgba(29, 143, 134, 0.16);
    border-radius: 18px;
    box-shadow: 0 14px 32px rgba(16, 34, 56, 0.07);
    display: grid;
    gap: 0.25rem;
    grid-template-columns: auto minmax(0, 1fr);
    padding: 1rem;
}

.teacher-quick-step span {
    align-items: center;
    background: #0f766e;
    border-radius: 999px;
    color: #ffffff;
    display: inline-flex;
    font-weight: 850;
    height: 2rem;
    justify-content: center;
    width: 2rem;
}

.teacher-quick-step strong,
.teacher-quick-step small {
    min-width: 0;
}

.teacher-quick-step strong {
    color: #102238;
    font-size: 0.98rem;
    line-height: 1.25;
}

.teacher-quick-step small {
    color: #5d7180;
    grid-column: 2;
    line-height: 1.45;
}

.teacher-one-click-panel {
    align-items: center;
    background: linear-gradient(135deg, rgba(11, 95, 85, 0.96), rgba(21, 70, 102, 0.94));
    border: 1px solid rgba(66, 217, 200, 0.30);
    border-radius: 20px;
    box-shadow: 0 18px 44px rgba(11, 43, 64, 0.18);
    color: #efffff;
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    padding: 1.15rem 1.25rem;
}

.teacher-one-click-panel p {
    color: rgba(239, 255, 255, 0.78);
    margin: 0.25rem 0 0;
}

.teacher-one-click-label {
    color: #ffcf75;
    font-size: 0.72rem;
    font-weight: 850;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.teacher-one-click-panel > .bi {
    color: #ffcf75;
    flex: 0 0 auto;
    font-size: 2.4rem;
}

.teacher-advanced-settings {
    background: rgba(248, 252, 251, 0.92);
    border: 1px solid rgba(29, 143, 134, 0.16);
    border-radius: 16px;
    overflow: hidden;
}

.teacher-advanced-settings > summary {
    align-items: center;
    color: #27495a;
    cursor: pointer;
    display: flex;
    gap: 0.75rem;
    justify-content: space-between;
    list-style: none;
    padding: 0.95rem 1rem;
    position: relative;
}

.teacher-advanced-settings > summary::-webkit-details-marker {
    display: none;
}

.teacher-advanced-settings > summary span {
    align-items: center;
    display: inline-flex;
    font-weight: 850;
    gap: 0.45rem;
}

.teacher-advanced-settings > summary small {
    color: #6f8491;
    font-weight: 650;
    text-align: right;
}

.teacher-advanced-settings > summary::after {
    color: #0f766e;
    content: "+";
    font-size: 1.2rem;
    font-weight: 850;
}

.teacher-advanced-settings[open] > summary {
    border-bottom: 1px solid rgba(29, 143, 134, 0.14);
}

.teacher-advanced-settings[open] > summary::after {
    content: "-";
}

.teacher-advanced-settings-body {
    padding: 1rem;
}

.teacher-create-actions {
    display: grid;
    gap: 0.75rem;
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
}

.teacher-create-actions .btn {
    white-space: normal;
}

@media (max-width: 767.98px) {
    .teacher-quick-steps,
    .teacher-create-actions {
        grid-template-columns: 1fr;
    }

    .teacher-one-click-panel {
        align-items: flex-start;
    }

    .teacher-one-click-panel > .bi {
        font-size: 1.8rem;
    }

    .teacher-advanced-settings > summary {
        align-items: flex-start;
        flex-direction: column;
    }

    .teacher-advanced-settings > summary::after {
        position: absolute;
        right: 1rem;
    }
}