/* 基礎設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --secondary: #ec4899;
    --accent: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-main: #ffffff;
    --text-secondary: #e2e8f0;
    --border: #334155;
    
    --font-size: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "Segoe UI", sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    font-size: var(--font-size);
    line-height: 1.9;
    min-height: 100vh;
}

/* 頂部工具列 */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 1000;
}

.menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-dark);
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

.font-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.font-btn {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-dark);
    color: var(--text-main);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
}

.font-btn:hover, .font-btn.active {
    background: var(--primary);
    border-color: var(--primary);
}

/* 側邊欄 */
.sidebar {
    position: fixed;
    left: 0;
    top: 60px;
    bottom: 0;
    width: 280px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    z-index: 100;
}

.sidebar-header {
    padding: 24px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    color: var(--accent);
    font-size: 1.3rem;
    margin-bottom: 4px;
}

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

.episode-list {
    padding: 12px;
}

.episode-item {
    padding: 14px 16px;
    margin: 2px 0;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background 0.2s;
}

.episode-item:hover {
    background: var(--bg-hover);
}

.episode-item.active {
    background: var(--primary);
}

.ep-num {
    color: var(--text-secondary);
    font-size: 0.85rem;
    min-width: 40px;
}

.episode-item.active .ep-num {
    color: rgba(255,255,255,0.8);
}

.ep-name {
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 主內容區 */
.main-content {
    margin-left: 280px;
    margin-top: 60px;
    padding: 40px;
    max-width: 900px;
    min-height: calc(100vh - 60px);
}

/* 首頁 */
.hero {
    text-align: center;
    padding: 60px 30px;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-dark));
    border-radius: 20px;
    margin-bottom: 40px;
    border: 1px solid var(--border);
}

.hero h1 {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--accent), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.hero h2 {
    font-size: 1.6rem;
    margin-bottom: 16px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.15rem;
}

.intro, .characters {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 30px;
    border: 1px solid var(--border);
}

.intro h3, .characters h3 {
    color: var(--accent);
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.intro p {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

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

.character {
    text-align: center;
    padding: 24px 16px;
    background: var(--bg-dark);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.avatar {
    font-size: 3rem;
    margin-bottom: 12px;
}

.character h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

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

.start-section {
    text-align: center;
    margin: 40px 0;
}

.start-btn {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    padding: 18px 50px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
}

.start-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

/* 章節頁面 */
.episode-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.nav-btn {
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--bg-hover);
}

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

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ep-title {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.content-area {
    background: var(--bg-card);
    padding: 40px 50px;
    border-radius: 16px;
    border: 1px solid var(--border);
}

.content-area h1 {
    font-size: 1.9rem;
    color: var(--accent);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
}

.content-area h2 {
    font-size: 1.5rem;
    margin: 36px 0 20px;
}

.content-area h3 {
    font-size: 1.25rem;
    margin: 28px 0 16px;
    color: var(--secondary);
}

.content-area p {
    margin-bottom: 18px;
    color: var(--text-secondary);
    line-height: 2;
}

.content-area blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 20px;
    margin: 24px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.content-area hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 36px 0;
}

.content-area strong {
    color: var(--text-main);
}

/* 返回頂部 */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    transition: all 0.3s;
}

.back-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

/* 手機版 */
@media (max-width: 1024px) {
    .menu-btn {
        display: block;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .font-controls {
        margin-left: auto;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size: 18px;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .hero {
        padding: 40px 20px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .character-grid {
        grid-template-columns: 1fr;
    }
    
    .content-area {
        padding: 24px;
    }
    
    .episode-nav {
        flex-direction: column;
        gap: 12px;
    }
    
    .nav-buttons {
        width: 100%;
        justify-content: space-between;
    }
    
    .back-top {
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
    }
}

/* 滾動條 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}