/* =============================================
   減數分裂互動教學網頁 - 樣式表
   =============================================
   此樣式表包含：
   1. CSS 變數 (根變數)
   2. 全域重設與基礎樣式
   3. 導覽列樣式
   4. Hero 區塊樣式
   5. 各 Section 樣式
   6. 動畫模擬器樣式
   7. 染色分體互換模型
   8. 翻牌比較表樣式
   9. 測驗區樣式
   10. 動畫關鍵幀
   11. 響應式設計
   ============================================= */

/* ===========================================
   1. CSS 變數 (根變數)
   =========================================== */
:root {
    /* 主要色彩 - 生物學主題藍綠色系 */
    --primary-hue: 195;
    --primary-color: hsl(var(--primary-hue), 85%, 50%);
    --primary-light: hsl(var(--primary-hue), 85%, 65%);
    --primary-dark: hsl(var(--primary-hue), 85%, 35%);

    /* 強調色 */
    --accent-color: hsl(280, 70%, 60%);
    --accent-light: hsl(280, 70%, 75%);

    /* 背景色 - 深色主題 */
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);

    /* 文字色 */
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    /* 玻璃擬態 */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* 染色體顏色 */
    --chr-blue: #3b82f6;
    --chr-red: #ef4444;
    --chr-green: #22c55e;
    --chr-purple: #a855f7;

    /* 狀態顏色 */
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;

    /* 字型 */
    --font-main: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;

    /* 間距 */
    --nav-height: 70px;
    --section-padding: 100px;

    /* 動畫 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===========================================
   2. 全域重設與基礎樣式
   =========================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* 粒子背景 Canvas */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* 容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 5%;
}

/* 玻璃卡片 */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
}

/* 強調文字 */
.highlight {
    color: var(--primary-light);
    font-weight: 600;
}

/* 漸層文字 */
.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===========================================
   3. 導覽列樣式
   =========================================== */
#main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    background: rgba(10, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
    font-weight: 800;
}

.logo-icon {
    font-size: 1.6rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

/* 漢堡選單 */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.burger div {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.burger.active .line1 {
    transform: rotate(45deg) translate(5px, 6px);
}

.burger.active .line2 {
    opacity: 0;
}

.burger.active .line3 {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* 手機選單 */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 2rem;
    z-index: 999;
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    padding: 0.75rem 1rem;
    display: block;
    border-radius: 10px;
    transition: background var(--transition-fast);
}

.mobile-menu a:hover {
    background: var(--glass-bg);
}

/* ===========================================
   4. Hero 區塊樣式
   =========================================== */
#hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: calc(var(--nav-height) + 2rem) 5% 4rem;
    position: relative;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(168, 85, 247, 0.1) 0%, transparent 40%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-block;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--primary-light);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: transparent;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-secondary:hover {
    background: var(--glass-bg);
    border-color: var(--primary-color);
}

/* Hero 統計數據 */
.hero-stats {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--glass-border);
}

/* Hero 視覺區 */
.hero-visual {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.chromosome-container {
    position: relative;
    width: 100%;
    max-width: 400px;
}

.chromosome-svg {
    width: 100%;
    height: auto;
    animation: heroFloat 6s ease-in-out infinite;
}

.chromosome {
    animation: chromosomePulse 3s ease-in-out infinite;
}

.chr-2 {
    animation-delay: 1.5s;
}

/* 光暈效果 */
.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
    animation: glowPulse 4s ease-in-out infinite;
}

.glow-1 {
    width: 200px;
    height: 200px;
    background: var(--chr-blue);
    top: 10%;
    left: 20%;
}

.glow-2 {
    width: 180px;
    height: 180px;
    background: var(--chr-red);
    bottom: 20%;
    right: 20%;
    animation-delay: 2s;
}

/* ===========================================
   5. Section 通用樣式
   =========================================== */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-alt {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--primary-light);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ===========================================
   導論區塊樣式
   =========================================== */
.intro-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.intro-card {
    padding: 2rem;
    text-align: center;
    transition: transform var(--transition-normal);
}

.intro-card:hover {
    transform: translateY(-5px);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.intro-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--primary-light);
}

.intro-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 流程時間軸 */
.process-overview {
    background: var(--glass-bg);
    border-radius: 20px;
    padding: 3rem;
    border: 1px solid var(--glass-border);
}

.process-overview h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--primary-light);
}

.process-timeline {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 200px;
}

.timeline-marker {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.timeline-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.timeline-connector {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

/* ===========================================
   6. 動畫模擬器樣式
   =========================================== */
.simulator-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.simulator-stage {
    background: var(--bg-primary);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
    margin-bottom: 2rem;
}

#meiosis-svg {
    width: 100%;
    height: auto;
    display: block;
}

.cell-membrane {
    transition: all 1s ease;
}

.stage-label {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    border: 1px solid var(--glass-border);
}

/* 控制列 */
.simulator-controls {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 1.5rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 15px;
    border: 1px solid var(--glass-border);
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.control-buttons {
    display: flex;
    gap: 0.5rem;
}

.control-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.control-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.control-btn.play-btn {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
}

.control-btn.play-btn:hover {
    transform: scale(1.05);
}

.icon-pause.hidden,
.icon-play.hidden {
    display: none;
}

/* 進度條 */
.progress-bar {
    flex: 1;
    min-width: 200px;
}

.progress-track {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    transition: width var(--transition-normal);
}

.progress-steps {
    display: flex;
    justify-content: space-between;
}

.progress-step {
    width: 16px;
    height: 16px;
    border: 0;
    padding: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.progress-step:focus-visible, .flip-card:focus-visible {
    outline: 3px solid #facc15;
    outline-offset: 3px;
}

.progress-step.active {
    background: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
}

.progress-step.completed {
    background: var(--success);
}

/* 速度控制 */
.speed-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.speed-control label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.speed-control input[type="range"] {
    width: 80px;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    cursor: pointer;
}

.speed-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

#speed-value {
    font-size: 0.9rem;
    font-weight: 600;
    min-width: 30px;
}

/* 資訊面板 */
.info-panel {
    padding: 2rem;
}

.info-panel h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--primary-light);
}

.info-panel p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.info-highlights {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.highlight-tag {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary-light);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* ===========================================
   7. 染色分體互換模型
   =========================================== */
.simulator-model-note {
    margin: 0 0 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}
.crossing-over-wrapper { max-width: 900px; margin: 0 auto; }
.crossing-over-instructions, .crossing-info { padding: 2rem; }
.crossing-over-instructions { margin-bottom: 2rem; }
.crossing-over-instructions h3, .crossing-info h3 { color: var(--primary-light); margin-bottom: 1rem; }
.crossing-over-instructions p, .crossing-info p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 1rem; }
.crossing-over-stage {
    background: var(--bg-primary);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
}
.chromatid-model { display: grid; gap: 1rem; }
.chromatid-row { display: grid; grid-template-columns: minmax(120px, 1fr) minmax(0, 3fr); align-items: center; gap: 1rem; }
.chromatid-label { color: var(--text-secondary); font-size: 0.9rem; }
.chromatid-blocks { display: flex; min-width: 0; gap: 3px; }
.chromatid-block {
    flex: 1;
    min-width: 0;
    padding: 0.45rem 0.15rem;
    border-radius: 5px;
    color: white;
    text-align: center;
    font-weight: 700;
}
.chromatid-block.paternal { background: #2563eb; }
.chromatid-block.maternal { background: #dc2626; }
.chromatid-block.recombined { outline: 2px solid #facc15; outline-offset: -2px; }
.crossing-controls { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.75rem; margin-top: 1.5rem; }
.crossing-choice {
    border: 1px solid var(--primary-light);
    border-radius: 10px;
    background: rgba(59, 130, 246, 0.15);
    color: var(--primary-light);
    padding: 0.7rem 1rem;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}
.crossing-choice:hover, .crossing-choice:focus-visible { background: rgba(59, 130, 246, 0.3); }
.crossing-choice:focus-visible { outline: 3px solid #facc15; outline-offset: 3px; }
.crossing-result {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 15px;
    background: rgba(34, 197, 94, 0.1);
    text-align: center;
}
.crossing-result h4 { color: var(--success); margin-bottom: 1rem; }
.crossing-result p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 1.5rem; }

/* ===========================================
   8. 翻牌比較表樣式
   =========================================== */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.flip-card {
    height: 220px;
    perspective: 1000px;
    cursor: pointer;
}

.flip-card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.flip-card-front {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
}

.flip-card-front .card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.flip-card-front h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.flip-card-front p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.flip-card-back {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(168, 85, 247, 0.2));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    transform: rotateY(180deg);
}

.comparison-detail {
    width: 100%;
}

.compare-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    margin-bottom: 0.5rem;
}

.compare-item.mitosis {
    background: rgba(34, 197, 94, 0.15);
}

.compare-item.meiosis {
    background: rgba(168, 85, 247, 0.15);
}

.compare-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.compare-value {
    font-weight: 600;
}

.compare-divider {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

/* ===========================================
   9. 測驗區樣式
   =========================================== */
.quiz-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-container {
    padding: 2.5rem;
}

.quiz-progress {
    margin-bottom: 2rem;
}

.quiz-progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.quiz-progress-fill {
    height: 100%;
    width: 20%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    transition: width var(--transition-normal);
}

.quiz-progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.quiz-question {
    margin-bottom: 2rem;
}

.quiz-question h3 {
    font-size: 1.3rem;
    line-height: 1.6;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.quiz-option {
    padding: 1.25rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    font-size: 1rem;
    color: var(--text-primary);
    font-family: var(--font-main);
}

.quiz-option:hover:not(:disabled) {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary-color);
}

.quiz-option.selected {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.15);
}

.quiz-option.correct {
    background: rgba(34, 197, 94, 0.2);
    border-color: var(--success);
}

.quiz-option.wrong {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--error);
}

.quiz-option:disabled {
    cursor: not-allowed;
}

/* 回饋區 */
.quiz-feedback {
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.quiz-feedback.correct {
    background: rgba(34, 197, 94, 0.1);
}

.quiz-feedback.wrong {
    background: rgba(239, 68, 68, 0.1);
}

.feedback-icon {
    font-size: 1.5rem;
}

.quiz-feedback p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.quiz-actions {
    display: flex;
    justify-content: flex-end;
}

/* 結果區 */
.quiz-result {
    padding: 3rem;
    text-align: center;
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.quiz-result h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.result-score {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
}

.score-number {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-light);
}

.score-total {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.quiz-result p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* ===========================================
   Footer 樣式
   =========================================== */
footer {
    background: var(--bg-secondary);
    padding: 3rem 0;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: 700;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* ===========================================
   10. 動畫關鍵幀
   =========================================== */
@keyframes heroFloat {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

@keyframes chromosomePulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

@keyframes glowPulse {

    0%,
    100% {
        opacity: 0.4;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

/* Reveal 動畫 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 隱藏類別 */
.hidden {
    display: none !important;
}

/* ===========================================
   11. 響應式設計
   =========================================== */
@media screen and (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    #hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-content p {
        margin: 0 auto 2rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .intro-grid {
        grid-template-columns: 1fr;
    }

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

    .process-timeline {
        flex-direction: column;
    }

    .timeline-connector {
        width: 2px;
        height: 30px;
    }
}

@media screen and (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .burger {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        flex-wrap: wrap;
    }

    .simulator-controls {
        flex-direction: column;
        gap: 1.5rem;
    }

    .progress-bar {
        width: 100%;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .flip-card {
        height: 200px;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 4%;
    }

    .section-header h2 {
        font-size: 1.6rem;
    }

    .quiz-container {
        padding: 1.5rem;
    }

    .chromatid-row { grid-template-columns: 1fr; gap: 0.3rem; }
    .crossing-over-stage { padding: 1rem; }
}