/* ===================== 主题变量 ===================== */
:root {
    --bg-color: #050b14;
    --bg-gradient-top: #0f172a;
    --surface: rgba(16, 32, 56, 0.5);
    --surface-heavy: rgba(8, 16, 28, 0.85);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --color-primary: #38bdf8;
    --color-accent: #818cf8;
    --color-highlight: #fcd34d;
    --color-danger: #f87171;
    --border: rgba(255,255,255,0.06);
    --border-strong: rgba(255,255,255,0.12);
    --shadow: rgba(0,0,0,0.4);
    --bubble-color: rgba(56,189,248,0.15);
    --panel-bg: #0a1628;
    --font-heading: 'Noto Serif SC', serif;
    --font-body: 'Noto Sans SC', sans-serif;
    --font-display: 'Ma Shan Zheng', cursive;
}

[data-theme="light"] {
    --bg-color: #f0f4f8;
    --bg-gradient-top: #dbe4ee;
    --surface: rgba(255,255,255,0.8);
    --surface-heavy: rgba(241,245,249,0.95);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --color-primary: #0284c7;
    --color-accent: #6366f1;
    --color-highlight: #d97706;
    --color-danger: #dc2626;
    --border: rgba(0,0,0,0.06);
    --border-strong: rgba(0,0,0,0.12);
    --shadow: rgba(0,0,0,0.08);
    --bubble-color: rgba(2,132,199,0.06);
    --panel-bg: #f8fafc;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-body);
    color: var(--text-primary);
    background: var(--bg-color);
    -webkit-text-size-adjust: 100%;
}

h1,h2,h3,h4 { font-family: var(--font-heading); font-weight: 600; }
strong { color: var(--color-primary); }
em { color: var(--color-accent); font-style: italic; }
p { line-height: 1.8; }

/* ===================== 气泡装饰 ===================== */
.bubbles-container {
    position: fixed; inset: 0;
    pointer-events: none; z-index: 0;
    transition: opacity 0.5s;
}
.bubble {
    position: absolute; bottom: -20px;
    background: var(--bubble-color);
    border-radius: 50%;
    animation: rise infinite ease-in;
    will-change: transform, opacity;
}
@keyframes rise {
    0% { transform: translateY(0) scale(1); opacity: 0; }
    30% { opacity: 0.6; }
    100% { transform: translateY(-100vh) scale(0.5); opacity: 0; }
}

/* ===================== 主题切换 ===================== */
.theme-toggle {
    position: fixed; top: 20px; right: 20px; z-index: 900;
    width: 46px; height: 46px; border-radius: 50%;
    border: 2px solid var(--border-strong);
    background: var(--surface-heavy);
    backdrop-filter: blur(12px);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.3s;
    box-shadow: 0 4px 16px var(--shadow);
}
.theme-toggle:hover { transform: scale(1.12); border-color: var(--color-primary); }
.theme-icon { font-size: 1.3rem; transition: transform 0.4s; }
.theme-toggle:hover .theme-icon { transform: rotate(30deg); }

/* ===================== 侧边导航 ===================== */
.slide-nav {
    position: fixed; right: 20px; top: 50%; transform: translateY(-50%);
    z-index: 800;
    display: flex; flex-direction: column; gap: 10px;
}
.nav-dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--text-secondary); opacity: 0.3;
    cursor: pointer;
    transition: all 0.3s;
}
.nav-dot:hover { opacity: 0.7; transform: scale(1.3); }
.nav-dot.active {
    opacity: 1; background: var(--color-primary);
    box-shadow: 0 0 8px var(--color-primary);
    transform: scale(1.4);
}

/* ===================== 底部翻页提示 ===================== */
.page-hint {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    z-index: 800;
    display: flex; align-items: center; gap: 12px;
    background: var(--surface-heavy);
    backdrop-filter: blur(12px);
    padding: 6px 16px; border-radius: 30px;
    border: 1px solid var(--border);
    font-size: 0.8rem; color: var(--text-secondary);
    transition: opacity 0.3s;
}
.hint-arrows { display: flex; gap: 4px; }
.hint-arrow {
    background: none; border: none; color: var(--color-primary);
    cursor: pointer; font-size: 0.7rem; padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.2s;
}
.hint-arrow:hover { background: rgba(56,189,248,0.15); }

/* ===================== 幻灯片组 ===================== */
.slide-deck {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
}
.slide-deck::-webkit-scrollbar { display: none; }

.slide {
    min-height: 100vh;
    scroll-snap-align: start;
    display: flex; align-items: center; justify-content: center;
    padding: 5rem 2rem;
    position: relative;
}

.slide-content {
    max-width: 900px; width: 100%;
    text-align: center;
}

/* 入场动画 */
.slide-content > * {
    opacity: 0;
    transform: translateY(35px);
    transition: opacity 0.7s cubic-bezier(0.4,0,0.2,1), transform 0.7s cubic-bezier(0.4,0,0.2,1);
}
.slide.in-view .slide-content > *:nth-child(1) { opacity: 1; transform: none; transition-delay: 0.1s; }
.slide.in-view .slide-content > *:nth-child(2) { opacity: 1; transform: none; transition-delay: 0.2s; }
.slide.in-view .slide-content > *:nth-child(3) { opacity: 1; transform: none; transition-delay: 0.35s; }
.slide.in-view .slide-content > *:nth-child(4) { opacity: 1; transform: none; transition-delay: 0.5s; }
.slide.in-view .slide-content > *:nth-child(5) { opacity: 1; transform: none; transition-delay: 0.65s; }
.slide.in-view .slide-content > *:nth-child(6) { opacity: 1; transform: none; transition-delay: 0.8s; }
.slide.in-view .slide-content > *:nth-child(7) { opacity: 1; transform: none; transition-delay: 0.95s; }

/* ===================== Hero 幻灯片 ===================== */
.slide-hero .slide-content { max-width: 700px; }

.course-badge {
    display: inline-block;
    padding: 0.35rem 1.5rem; border-radius: 30px;
    border: 1px solid var(--color-primary);
    font-size: 0.8rem; color: var(--color-primary);
    letter-spacing: 0.25em;
    background: rgba(56,189,248,0.06);
    margin-bottom: 1rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 9vw, 5.5rem);
    color: var(--color-primary);
    letter-spacing: 0.12em; line-height: 1.15;
    margin-bottom: 0.8rem;
    text-shadow: 0 0 40px rgba(56,189,248,0.35);
}
[data-theme="light"] .hero-title { text-shadow: none; }

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    color: var(--color-accent); font-weight: 300;
    margin-bottom: 1.5rem;
}

.hero-desc {
    color: var(--text-secondary);
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    line-height: 2;
}

.hero-scroll-hint {
    margin-top: 3rem;
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    color: var(--color-primary); opacity: 0.5;
    font-size: 0.8rem; letter-spacing: 0.2em;
    animation: float 3s infinite ease-in-out;
}
.scroll-arrow {
    width: 14px; height: 14px;
    border-bottom: 2px solid var(--color-primary);
    border-right: 2px solid var(--color-primary);
    transform: rotate(45deg);
}
@keyframes float {
    0%,100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===================== 通用幻灯片标题 ===================== */
.slide-title {
    font-size: clamp(1.6rem, 4vw, 2.5rem);
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    line-height: 1.3;
}
.slide-subtitle {
    color: var(--text-secondary);
    font-size: 1rem; margin-bottom: 2rem;
}

/* ===================== 课程时间线卡片 ===================== */
.timeline-grid {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem; text-align: left;
}
.tl-card {
    display: flex; gap: 1rem; align-items: flex-start;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px; padding: 1.4rem;
    transition: transform 0.3s, box-shadow 0.3s;
}
.tl-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px var(--shadow); }
.tl-num {
    font-family: var(--font-display);
    font-size: 2rem; color: var(--color-primary); opacity: 0.3;
    line-height: 1; flex-shrink: 0;
}
.tl-body strong { display: block; color: var(--text-primary); font-size: 1.05rem; margin-bottom: 0.3rem; }
.tl-time {
    display: inline-block; font-size: 0.7rem;
    color: var(--color-accent); border: 1px solid var(--color-accent);
    padding: 0.1rem 0.5rem; border-radius: 20px; margin-bottom: 0.3rem;
}
.tl-body p { font-size: 0.85rem; color: var(--text-secondary); margin: 0; line-height: 1.5; }

/* ===================== 问题卡片（破冰） ===================== */
.question-cards { display: grid; gap: 1rem; text-align: left; }
.question-cards.three-col { grid-template-columns: repeat(3, 1fr); }

.q-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px; padding: 1.5rem;
    transition: transform 0.3s, border-color 0.3s;
}
.q-card:hover { transform: translateY(-3px); border-color: var(--color-primary); }
.q-label {
    display: inline-block;
    background: var(--color-primary); color: var(--bg-color);
    font-weight: 700; font-size: 0.7rem;
    padding: 0.15rem 0.5rem; border-radius: 4px;
    margin-bottom: 0.6rem;
}
[data-theme="light"] .q-label { color: #fff; }
.q-card p { font-size: 1rem; margin: 0; color: var(--text-primary); line-height: 1.7; }

/* ===================== 作者区块 ===================== */
.author-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px; padding: 2rem;
    text-align: left; margin-bottom: 1.5rem;
}
.author-block p { font-size: 1rem; margin-bottom: 0.75rem; color: var(--text-secondary); }
.author-style {
    color: var(--color-accent) !important;
    font-family: var(--font-heading);
    font-style: italic; font-size: 1.05rem !important;
    margin-top: 0.5rem;
}

.theme-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
.tag {
    padding: 0.35rem 0.9rem; border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    background: rgba(129,140,248,0.06);
    transition: background 0.2s, transform 0.2s;
}
.tag:hover { background: rgba(129,140,248,0.15); transform: translateY(-2px); }

/* ===================== 阅读指引 ===================== */
.pre-questions {
    display: flex; flex-direction: column; gap: 0.8rem;
    text-align: left; margin-bottom: 2rem;
}
.pq-item {
    padding: 1.1rem 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--color-highlight);
    border-radius: 0 10px 10px 0;
    font-size: 1rem; color: var(--text-primary);
    line-height: 1.7;
    transition: transform 0.2s;
}
.pq-item:hover { transform: translateX(4px); }

.reading-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.action-btn {
    padding: 0.8rem 2rem; border-radius: 30px;
    border: 1px solid var(--color-primary);
    background: rgba(56,189,248,0.1); color: var(--color-primary);
    font-size: 1rem; cursor: pointer;
    font-family: var(--font-body);
    transition: all 0.3s;
}
.action-btn:hover {
    background: var(--color-primary); color: var(--bg-color);
    box-shadow: 0 0 20px rgba(56,189,248,0.3);
}
[data-theme="light"] .action-btn:hover { color: #fff; }
.action-btn.secondary { border-color: var(--color-accent); color: var(--color-accent); background: rgba(129,140,248,0.08); }
.action-btn.secondary:hover { background: var(--color-accent); color: #fff; box-shadow: 0 0 20px rgba(129,140,248,0.3); }

/* ===================== 讨论幻灯片 ===================== */
.discuss-header {
    margin-bottom: 2rem;
}
.discuss-round {
    display: inline-block;
    padding: 0.3rem 1.2rem; border-radius: 20px;
    background: var(--color-primary); color: var(--bg-color);
    font-size: 0.8rem; font-weight: 700;
    letter-spacing: 0.15em;
    margin-bottom: 0.6rem;
}
[data-theme="light"] .discuss-round { color: #fff; }

.discuss-questions {
    display: flex; flex-direction: column; gap: 1.2rem;
    text-align: left;
}
.dq-item {
    display: flex; gap: 1rem; align-items: flex-start;
    padding: 1.3rem 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.dq-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: 0 6px 20px var(--shadow);
}
.dq-num {
    font-size: 1.4rem; flex-shrink: 0;
    line-height: 1; margin-top: 2px;
}
.dq-item p { font-size: 1rem; margin: 0; line-height: 1.8; color: var(--text-primary); }
.dq-item em { font-family: var(--font-heading); }

.open-text-btn {
    margin-top: 1.5rem;
    background: none; border: 1px dashed var(--border-strong);
    color: var(--text-secondary); padding: 0.5rem 1.2rem;
    border-radius: 8px; cursor: pointer;
    font-size: 0.85rem; font-family: var(--font-body);
    transition: all 0.2s;
}
.open-text-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ===================== 反思写作 ===================== */
.writing-prompts {
    display: flex; flex-direction: column; gap: 1rem;
    text-align: left;
}
.wp-card {
    position: relative;
    padding: 1.3rem 1.5rem 1.3rem 3rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 12px 12px 0;
    transition: transform 0.2s;
}
.wp-card:hover { transform: translateX(4px); }
.wp-quote {
    position: absolute; left: 0.7rem; top: 0.5rem;
    font-family: var(--font-display);
    font-size: 2.5rem; color: var(--color-accent); opacity: 0.2;
    line-height: 1;
}
.wp-card p { margin: 0; font-size: 1rem; color: var(--text-primary); font-family: var(--font-heading); line-height: 1.7; }

/* ===================== 收束幻灯片 ===================== */
.final-quote {
    margin-bottom: 2rem;
}
.final-quote p {
    font-family: var(--font-heading);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    line-height: 2.2; font-style: italic;
}

.final-message { margin-bottom: 2rem; }
.final-message p { font-size: 1.05rem; color: var(--text-primary); line-height: 1.9; }

.final-beliefs {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 1rem; margin-bottom: 2rem;
}
.belief-card {
    padding: 1.5rem; border-radius: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 2px solid var(--color-primary);
    text-align: center;
    transition: transform 0.3s;
}
.belief-card:hover { transform: translateY(-4px); }
.belief-icon { font-size: 1.8rem; display: block; margin-bottom: 0.5rem; }
.belief-card strong { display: block; margin-bottom: 0.4rem; font-size: 1rem; }
.belief-card p { font-size: 0.85rem; color: var(--text-secondary); margin: 0; line-height: 1.6; }

.final-submarine {
    margin: 1.5rem 0;
    animation: float-sub 5s infinite ease-in-out;
    opacity: 0.6;
}
@keyframes float-sub {
    0%,100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(1.5deg); }
}

.copyright {
    font-size: 0.75rem; color: var(--text-secondary); opacity: 0.3;
    margin-top: 1rem;
}

/* ===================== 阅读覆盖面板 ===================== */
.reader-panel {
    position: fixed; top: 0; right: 0;
    width: 100%; height: 100vh;
    background: var(--panel-bg);
    z-index: 950;
    transform: translateX(100%);
    transition: transform 0.5s cubic-bezier(0.4,0,0.2,1);
    display: flex; flex-direction: column;
}
[data-theme="light"] .reader-panel { background: var(--panel-bg); }
.reader-panel.open { transform: translateX(0); }

.panel-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    background: var(--surface-heavy);
    backdrop-filter: blur(12px);
}
.panel-header h3 { font-size: 1rem; color: var(--text-primary); }
.panel-close {
    width: 36px; height: 36px; border-radius: 50%;
    border: 1px solid var(--border-strong);
    background: transparent; color: var(--text-secondary);
    font-size: 1.2rem; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
}
.panel-close:hover { border-color: var(--color-danger); color: var(--color-danger); }

.panel-body {
    flex: 1; overflow-y: auto; padding: 2rem;
    -webkit-overflow-scrolling: touch;
}

/* ===================== 小说排版 ===================== */
.novel-content, .analysis-content {
    max-width: 42em; margin: 0 auto;
}

.novel-title {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    color: var(--color-primary);
    text-align: center; margin-bottom: 0.3rem;
    font-family: var(--font-heading);
}
.novel-author {
    text-align: center; color: var(--text-secondary);
    font-size: 0.95rem; margin-bottom: 2.5rem;
}

.novel-content p {
    font-family: var(--font-heading);
    font-size: 1.1rem; line-height: 2;
    text-indent: 2em; text-align: justify;
    margin-bottom: 1.2rem; letter-spacing: 0.03em;
    color: var(--text-primary);
}

.novel-layer { margin-bottom: 2rem; }
.layer-label {
    font-family: var(--font-body);
    font-size: 0.7rem; color: var(--color-primary);
    letter-spacing: 0.2em; text-indent: 0; text-align: center;
    margin-bottom: 2rem;
    padding: 0.4rem 1rem; border: 1px solid rgba(56,189,248,0.2);
    border-radius: 30px; display: inline-block;
    position: relative; left: 50%; transform: translateX(-50%);
    background: rgba(56,189,248,0.04);
}
.layer-a { border-left: 2px solid rgba(129,140,248,0.12); padding-left: 1.5rem; }
.layer-a .layer-label { color: var(--color-accent); border-color: rgba(129,140,248,0.2); background: rgba(129,140,248,0.04); }
.layer-b { border-left: 2px solid rgba(56,189,248,0.12); padding-left: 1.5rem; }
.layer-c { border-left: 2px solid rgba(252,211,77,0.12); padding-left: 1.5rem; }
.layer-c .layer-label { color: var(--color-highlight); border-color: rgba(252,211,77,0.2); background: rgba(252,211,77,0.04); }

.narrative-divider { text-align: center; margin: 2.5rem 0; position: relative; }
.narrative-divider::before {
    content: ''; position: absolute; top: 50%; left: 10%; right: 10%;
    height: 1px; background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}
.narrative-divider span {
    position: relative; background: var(--panel-bg);
    padding: 0 1.5rem; color: var(--color-primary);
    font-size: 0.85rem; letter-spacing: 0.5em; z-index: 1; opacity: 0.5;
}
[data-theme="light"] .narrative-divider span { background: var(--panel-bg); }

.section-break { text-align: center; margin: 1.5rem 0; }
.section-break span { color: var(--text-secondary); font-size: 1rem; letter-spacing: 1em; opacity: 0.25; }

.novel-highlight {
    text-indent: 2em;
    background: rgba(252,211,77,0.06);
    border-left: 3px solid var(--color-highlight);
    padding: 1rem 1.5rem 1rem 2rem;
    margin: 1.2rem 0; border-radius: 0 8px 8px 0;
    color: #fde68a; line-height: 2;
}
[data-theme="light"] .novel-highlight { color: #92400e; background: rgba(217,119,6,0.06); }

.novel-date {
    text-indent: 0; text-align: right;
    color: var(--text-secondary); font-size: 0.85rem;
    margin-top: 2rem; opacity: 0.4;
}

/* ===================== 分析排版 ===================== */
.analysis-content { max-width: 50em; }
.analysis-content p { font-size: 1rem; line-height: 1.8; margin-bottom: 1rem; color: var(--text-primary); }

.analysis-abstract {
    background: rgba(56,189,248,0.06);
    border-left: 3px solid var(--color-primary);
    padding: 1.2rem 1.5rem; border-radius: 0 10px 10px 0;
    margin-bottom: 2rem;
}
.analysis-abstract h3 { color: var(--color-primary); margin-bottom: 0.5rem; font-size: 1.1rem; }
.analysis-abstract p { color: var(--text-secondary); margin: 0; }

.analysis-section { margin-bottom: 2.5rem; }
.as-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.as-num {
    background: var(--color-primary); color: var(--bg-color);
    font-weight: 700; padding: 0.3rem 0.8rem; border-radius: 20px;
    font-size: 0.8rem; flex-shrink: 0;
}
[data-theme="light"] .as-num { color: #fff; }
.as-header h3 { font-size: 1.2rem; margin: 0; color: var(--text-primary); }

.timeline-list { border-left: 2px solid var(--color-accent); padding-left: 1.5rem; margin: 1rem 0; }
.tl-entry { margin-bottom: 1rem; font-size: 0.95rem; color: var(--text-secondary); position: relative; }
.tl-entry::before {
    content: ''; position: absolute; left: -2rem; top: 0.35rem;
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--color-accent);
}
.tl-entry.highlight::before { background: var(--color-highlight); box-shadow: 0 0 6px var(--color-highlight); }
.tl-entry strong { color: var(--text-primary); }

.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1rem 0; }
.comp-card { background: var(--surface); padding: 1.2rem; border-radius: 10px; }
.comp-card.day { border-top: 3px solid var(--text-secondary); }
.comp-card.night { border-top: 3px solid var(--color-primary); }
.comp-card h4 { margin-bottom: 0.5rem; }
.comp-card ul { padding-left: 1rem; color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }
.comp-card li { margin-bottom: 0.3rem; }

.quote {
    padding: 1.2rem 1.5rem 1.2rem 2rem;
    margin: 1rem 0;
    font-family: var(--font-heading);
    font-size: 1rem; line-height: 1.8;
    color: var(--color-primary); font-style: italic;
    background: rgba(56,189,248,0.06);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 8px 8px 0;
}

.info-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; margin: 1rem 0; }
.info-card {
    background: rgba(255,255,255,0.03); padding: 1rem;
    border-radius: 8px; font-size: 0.9rem; color: var(--text-secondary);
    transition: background 0.2s;
}
[data-theme="light"] .info-card { background: rgba(0,0,0,0.03); }
.info-card:hover { background: rgba(255,255,255,0.06); }
[data-theme="light"] .info-card:hover { background: rgba(0,0,0,0.05); }

.custom-list { padding-left: 1.5rem; }
.custom-list li { margin-bottom: 0.6rem; font-size: 0.95rem; line-height: 1.7; color: var(--text-secondary); }

.analysis-section.final { border-top: 1px solid var(--border); padding-top: 1.5rem; }
.analysis-section.final h3 { color: var(--color-highlight); text-align: center; margin-bottom: 1rem; }
.analysis-section.final p { text-align: center; color: var(--text-secondary); }

/* ===================== 响应式：投影 + 手机 ===================== */

/* 大屏投影模式（>1200px）：更大文字，更充裕间距 */
@media (min-width: 1200px) {
    .slide-title { font-size: 2.8rem; }
    .slide-subtitle { font-size: 1.15rem; }
    .dq-item p { font-size: 1.1rem; }
    .tl-card { padding: 1.8rem; }
    .belief-card { padding: 2rem; }
    .hero-desc { font-size: 1.2rem; }
}

/* 平板 & 小笔记本（<=768px）*/
@media (max-width: 768px) {
    /* 幻灯片改为柔性吸附，滚动更自然 */
    .slide-deck { scroll-snap-type: y proximity; }
    .slide { padding: 3rem 1.25rem; min-height: auto; }
    .slide-content { max-width: 100%; }

    /* 隐藏侧边圆点导航，靠底部页码即可 */
    .slide-nav { display: none; }

    /* 底部页码增大 */
    .page-hint { font-size: 0.85rem; padding: 8px 18px; }
    .hint-arrow { font-size: 0.85rem; padding: 6px 10px; min-width: 36px; min-height: 36px; }

    /* 主题切换按钮 */
    .theme-toggle { width: 42px; height: 42px; top: 10px; right: 10px; }
    .theme-icon { font-size: 1.15rem; }

    /* 布局简化 */
    .timeline-grid { grid-template-columns: 1fr; }
    .question-cards.three-col { grid-template-columns: 1fr; }
    .final-beliefs { grid-template-columns: 1fr; }
    .comparison-grid { grid-template-columns: 1fr; }
    .info-cards { grid-template-columns: 1fr; }

    /* 问题卡片 */
    .dq-item { padding: 1rem; }
    .dq-num { font-size: 1.2rem; }

    /* 覆盖面板 */
    .panel-body { padding: 1.25rem; }
    .novel-content p { font-size: 1rem; line-height: 1.9; }
    .layer-a, .layer-b, .layer-c { padding-left: 0.8rem; }

    /* 参考按钮增大触摸目标 */
    .ref-btn { width: 36px; height: 36px; font-size: 1.1rem; right: 8px; opacity: 0.7; }
    .dq-item p { padding-right: 42px; }

    /* 操作按钮增大 */
    .action-btn { padding: 0.9rem 1.8rem; font-size: 1rem; }
    .open-text-btn { padding: 0.6rem 1.2rem; font-size: 0.9rem; }
}

/* 手机竖屏（<=480px）*/
@media (max-width: 480px) {
    .slide { padding: 2.5rem 1rem; }

    /* Hero 适配 */
    .hero-title { letter-spacing: 0.05em; font-size: 2.5rem; }
    .hero-subtitle { font-size: 0.9rem; }
    .hero-desc { font-size: 0.9rem; line-height: 1.8; }
    .course-badge { font-size: 0.7rem; padding: 0.25rem 1rem; }

    /* 标题适配 */
    .slide-title { font-size: 1.4rem; }
    .slide-subtitle { font-size: 0.85rem; margin-bottom: 1.2rem; }

    /* 卡片适配 */
    .tl-card { flex-direction: column; gap: 0.5rem; padding: 1rem; }
    .tl-num { font-size: 1.5rem; }
    .q-card { padding: 1rem; }
    .q-card p { font-size: 0.9rem; }

    /* 讨论问题 */
    .discuss-round { font-size: 0.7rem; padding: 0.25rem 0.8rem; }
    .dq-item { gap: 0.6rem; }
    .dq-item p { font-size: 0.9rem; line-height: 1.7; }
    .dq-num { font-size: 1.1rem; min-width: 1.5rem; }

    /* 作者区块 */
    .author-block { padding: 1.2rem; }
    .author-block p { font-size: 0.9rem; }
    .tag { font-size: 0.7rem; padding: 0.25rem 0.7rem; }

    /* 反思写作 */
    .wp-card { padding: 1rem 1rem 1rem 2.2rem; }
    .wp-quote { font-size: 2rem; left: 0.4rem; }

    /* 收束幻灯片 */
    .final-quote p { font-size: 1rem; line-height: 2; }
    .belief-card { padding: 1rem; }
    .belief-icon { font-size: 1.4rem; }
    .belief-card strong { font-size: 0.9rem; }
    .belief-card p { font-size: 0.8rem; }

    /* 操作按钮 */
    .reading-actions { flex-direction: column; gap: 0.6rem; }
    .action-btn { width: 100%; text-align: center; }

    /* 弹窗手机全屏化 */
    .ref-modal-overlay { padding: 0.5rem; }
    .ref-modal { max-height: 92vh; border-radius: 12px; }
    .ref-modal-body { padding: 1rem; }
    .ref-title { font-size: 1rem; margin-bottom: 1rem; }
    .ref-block p { font-size: 0.85rem; line-height: 1.7; }
    .thinker-card { padding: 0.8rem; }
    .thinker-card strong { font-size: 0.8rem; }
    .thinker-card p { font-size: 0.8rem; line-height: 1.6; }

    /* 面板手机适配 */
    .panel-header { padding: 0.8rem 1rem; }
    .panel-close { width: 32px; height: 32px; }
}

/* ===================== 参考视角按钮 ===================== */
.dq-item { position: relative; }

.ref-btn {
    position: absolute; top: 50%; right: 12px; transform: translateY(-50%);
    width: 32px; height: 32px; border-radius: 50%;
    border: 1px solid var(--border-strong);
    background: var(--surface); color: var(--text-secondary);
    font-size: 1rem; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.3s;
    opacity: 0.5;
}
.ref-btn:hover {
    opacity: 1; border-color: var(--color-highlight);
    box-shadow: 0 0 12px rgba(252,211,77,0.3);
    transform: translateY(-50%) scale(1.15);
}
.dq-item p { padding-right: 40px; }

/* ===================== 弹窗模态框 ===================== */
.ref-modal-overlay {
    position: fixed; inset: 0; z-index: 1000;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(6px);
    display: none; align-items: center; justify-content: center;
    padding: 2rem;
    opacity: 0;
    transition: opacity 0.3s;
}
.ref-modal-overlay.open {
    display: flex;
    opacity: 1;
}

.ref-modal {
    position: relative;
    width: 100%; max-width: 680px;
    max-height: 85vh;
    background: var(--panel-bg);
    border: 1px solid var(--border-strong);
    border-radius: 20px;
    box-shadow: 0 24px 80px rgba(0,0,0,0.5);
    overflow: hidden;
    display: flex; flex-direction: column;
    transform: translateY(20px) scale(0.97);
    transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
}
.ref-modal-overlay.open .ref-modal {
    transform: translateY(0) scale(1);
}

[data-theme="light"] .ref-modal {
    box-shadow: 0 24px 80px rgba(0,0,0,0.15);
}

.ref-modal-close {
    position: absolute; top: 12px; right: 12px;
    width: 32px; height: 32px; border-radius: 50%;
    border: 1px solid var(--border-strong);
    background: transparent; color: var(--text-secondary);
    font-size: 1rem; cursor: pointer; z-index: 2;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
}
.ref-modal-close:hover { border-color: var(--color-danger); color: var(--color-danger); }

.ref-modal-body {
    flex: 1; overflow-y: auto; padding: 2rem;
    -webkit-overflow-scrolling: touch;
}

/* 弹窗内部标题 */
.ref-title {
    font-family: var(--font-heading);
    font-size: 1.3rem; color: var(--color-primary);
    margin-bottom: 1.5rem; padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    line-height: 1.4;
}

/* 参考章节块 */
.ref-block {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px dashed var(--border);
}
.ref-block:last-child { border-bottom: none; padding-bottom: 0; margin-bottom: 0; }

.ref-block-header {
    display: flex; align-items: center; gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 1rem; font-weight: 600;
    color: var(--text-primary);
}
.ref-block-icon { font-size: 1.1rem; }

.ref-block p {
    font-size: 0.95rem; color: var(--text-secondary);
    line-height: 1.8; margin: 0;
}
.ref-block p strong { color: var(--color-primary); }

/* 思想家卡片 */
.thinker-card {
    margin-bottom: 0.8rem; padding: 1rem 1.2rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 10px 10px 0;
    transition: border-color 0.2s, transform 0.2s;
}
.thinker-card:hover { border-left-color: var(--color-highlight); transform: translateX(3px); }
.thinker-card:last-child { margin-bottom: 0; }

[data-theme="light"] .thinker-card { background: rgba(0,0,0,0.02); }

.thinker-card strong {
    display: block; font-size: 0.9rem;
    color: var(--color-accent); margin-bottom: 0.4rem;
    font-family: var(--font-heading);
}
.thinker-card p {
    font-size: 0.9rem; color: var(--text-secondary);
    line-height: 1.7; margin: 0;
}

/* 弹窗响应式 */
@media (max-width: 768px) {
    .ref-modal-overlay { padding: 1rem; }
    .ref-modal { max-height: 90vh; border-radius: 14px; }
    .ref-modal-body { padding: 1.25rem; }
    .ref-title { font-size: 1.1rem; }
    .ref-btn { width: 28px; height: 28px; right: 8px; font-size: 0.85rem; }
    .dq-item p { padding-right: 34px; }
}