:root {
    --bg-prime: #0a0a0b;
    --text-white: #ffffff;
    --text-muted: #88888e;
    --accent-green: #2e8b57;
    --accent-gold: #d4a017;
    --border-dim: rgba(255, 255, 255, 0.08);
    --card-bg: #141416;

    --font-inter: 'Inter', sans-serif;
    --font-serif: 'EB Garamond', serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-prime);
    color: var(--text-white);
    font-family: var(--font-inter);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Elements - River Flow */
.bg-river {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,
        transparent 0%,
        rgba(46, 139, 87, 0.03) 25%,
        transparent 50%,
        rgba(212, 160, 23, 0.02) 75%,
        transparent 100%);
    z-index: -1;
    animation: riverFlow 20s ease-in-out infinite;
}

@keyframes riverFlow {
    0%, 100% {
        transform: translateX(0) translateY(0);
    }
    50% {
        transform: translateX(30px) translateY(-20px);
    }
}

.bg-dots {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 80px 80px;
    z-index: -1;
}

/* Container */
.duan-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 100px 40px;
}

/* Header */
.header-main {
    text-align: center;
    margin-bottom: 120px;
    padding: 60px 0;
    border-bottom: 1px solid var(--border-dim);
}

.badge-line {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
}

.badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 4px 14px;
    border: 1px solid var(--text-muted);
    letter-spacing: 0.15em;
    border-radius: 4px;
}

.badge.accent {
    background: var(--accent-gold);
    color: #000;
    border: none;
    font-weight: 700;
}

.main-title {
    font-size: clamp(3.5rem, 12vw, 8rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 0.85;
    margin-bottom: 20px;
}

.role-desc {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    letter-spacing: 0.1em;
}

.motto-box {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-style: italic;
    max-width: 700px;
    margin: 0 auto 60px;
    line-height: 1.3;
}

.core-pillars {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.pillar {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    font-weight: 600;
}

.pillar span {
    color: var(--accent-green);
    font-family: var(--font-mono);
}

/* Cards */
.section-card {
    background: var(--card-bg);
    border: 1px solid var(--border-dim);
    padding: 60px;
    margin-bottom: 60px;
    position: relative;
    border-radius: 8px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.card-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent-green);
    margin-bottom: 25px;
    display: block;
    letter-spacing: 0.2em;
}

.section-card h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 30px;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 30px;
    line-height: 1.6;
}

/* Benfen Visual */
.benfen-visual {
    margin: 40px 0;
}

.benfen-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.benfen-circle {
    background: rgba(46, 139, 87, 0.1);
    border: 2px solid var(--accent-green);
    padding: 20px 40px;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s;
}

.benfen-circle:hover {
    background: rgba(46, 139, 87, 0.2);
    transform: scale(1.05);
}

.benfen-arrow {
    color: var(--accent-green);
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

.benfen-explanation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.benfen-item {
    background: rgba(255, 255, 255, 0.02);
    padding: 25px;
    border-radius: 8px;
    border-left: 3px solid var(--accent-green);
}

.benfen-label {
    display: block;
    color: var(--accent-green);
    font-weight: 700;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.benfen-item p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.insight {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--accent-gold);
    text-align: center;
    margin-top: 40px;
    font-size: 1.1rem;
}

/* Section Grid */
.section-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 60px;
}

.block-card {
    background: var(--card-bg);
    padding: 40px;
    border: 1px solid var(--border-dim);
    border-radius: 8px;
}

.accent-green {
    border-top: 4px solid var(--accent-green);
}

.block-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--accent-green);
}

/* Paradox Visual */
.paradox-visual {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-top: 30px;
}

.paradox-box {
    flex: 1;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid var(--border-dim);
    transition: all 0.3s;
}

.paradox-box.wrong {
    background: rgba(255, 0, 0, 0.05);
    border-color: rgba(255, 0, 0, 0.3);
}

.paradox-box.right {
    background: rgba(46, 139, 87, 0.05);
    border-color: var(--accent-green);
}

.paradox-box span {
    display: block;
    font-weight: 700;
    font-size: 1.1rem;
}

.paradox-box small {
    display: block;
    margin-top: 8px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.paradox-divider {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

/* Understand Layers */
.understand-layers {
    margin-top: 30px;
}

.layer-item {
    padding: 20px;
    border-left: 2px solid var(--border-dim);
    margin-bottom: 20px;
    transition: all 0.3s;
}

.layer-item:hover {
    border-left-color: var(--accent-green);
    background: rgba(46, 139, 87, 0.02);
}

.layer-num {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background: var(--accent-green);
    color: white;
    border-radius: 50%;
    margin-right: 15px;
    font-weight: 700;
}

.layer-item h5 {
    display: inline;
    font-size: 1rem;
    font-weight: 600;
}

.layer-item p {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Stop Doing List */
.stop-list-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 30px;
}

.stop-category h4 {
    color: var(--accent-gold);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-dim);
}

.stop-items {
    list-style: none;
}

.stop-items li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.95rem;
    position: relative;
    padding-left: 25px;
}

.stop-items li::before {
    content: '×';
    position: absolute;
    left: 0;
    color: #ff4444;
    font-weight: 700;
}

.stop-items.positive li::before {
    content: '✓';
    color: var(--accent-green);
}

/* Case Studies */
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.case-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--border-dim);
    transition: all 0.3s;
}

.case-card:hover {
    border-color: var(--accent-gold);
    transform: translateY(-5px);
}

.case-year {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-gold);
    margin-bottom: 15px;
    display: block;
}

.case-name {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-white);
}

.case-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 15px;
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(212, 160, 23, 0.15);
    color: var(--accent-gold);
    border-radius: 20px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
}

/* Timeline */
.timeline-section {
    padding: 60px 0;
}

.timeline-container {
    padding-left: 120px;
    position: relative;
    margin-top: 40px;
}

.t-line {
    border-left: 2px solid var(--border-dim);
    padding-left: 40px;
}

.t-event {
    position: relative;
    margin-bottom: 50px;
}

.t-event::before {
    content: '';
    position: absolute;
    left: -48px;
    top: 5px;
    width: 14px;
    height: 14px;
    background: var(--bg-prime);
    border: 2px solid var(--accent-green);
    border-radius: 50%;
}

.t-event.highlight::before {
    background: var(--accent-gold);
    border-color: var(--accent-gold);
    box-shadow: 0 0 10px var(--accent-gold);
}

.t-year {
    position: absolute;
    left: -130px;
    top: 0;
    font-family: var(--font-mono);
    font-weight: 800;
    color: var(--accent-gold);
}

.t-event p {
    font-size: 1rem;
    color: var(--text-white);
}

/* People Grid */
.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.person-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--border-dim);
}

.person-card h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-white);
}

.person-role {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-green);
    margin-bottom: 15px;
    display: block;
}

.person-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Evolution Timeline */
.evolution-timeline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 60px 0;
    text-align: center;
}

.evo-phase {
    flex: 1;
    padding: 25px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    border: 1px solid var(--border-dim);
}

.evo-phase.current {
    background: rgba(46, 139, 87, 0.1);
    border-color: var(--accent-green);
}

.evo-year {
    display: block;
    font-family: var(--font-mono);
    color: var(--accent-gold);
    font-weight: 700;
    margin-bottom: 15px;
}

.evo-phase h5 {
    margin-bottom: 10px;
    font-size: 1rem;
}

.evo-phase p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.evo-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin: 0 15px;
}

/* Quotes Grid */
.quotes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.quote-item {
    background: rgba(255, 255, 255, 0.02);
    padding: 25px;
    border-radius: 8px;
    border-left: 3px solid var(--accent-gold);
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Footer */
.footer-main {
    text-align: center;
    padding: 100px 0;
    border-top: 1px solid var(--border-dim);
}

.final-vision {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 60px;
}

.footer-sign {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin-top: 20px;
    letter-spacing: 0.4em;
    color: var(--accent-green);
}

.source-meta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    line-height: 2;
}

/* Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Light Theme */
[data-theme="light"] body {
    background-color: #fafafa;
    color: #1a1a1e;
}

[data-theme="light"] .section-card,
[data-theme="light"] .block-card,
[data-theme="light"] .case-card,
[data-theme="light"] .person-card,
[data-theme="light"] .evo-phase {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .text-white,
[data-theme="light"] .text-muted,
[data-theme="light"] .t-event p,
[data-theme="light"] .person-card h4 {
    color: #1a1a1e;
}

[data-theme="light"] .text-muted,
[data-theme="light"] .person-desc,
[data-theme="light"] .evo-phase p {
    color: #4a4a5a;
}

/* Responsive */
@media (max-width: 768px) {
    .section-grid,
    .benfen-explanation,
    .stop-list-grid {
        grid-template-columns: 1fr;
    }

    .main-title {
        font-size: 4rem;
    }

    .duan-container {
        padding: 40px 20px;
    }

    .core-pillars {
        flex-direction: column;
        gap: 20px;
    }

    .paradox-visual {
        flex-direction: column;
        gap: 15px;
    }

    .evolution-timeline {
        flex-direction: column;
        gap: 30px;
    }

    .evo-arrow {
        transform: rotate(90deg);
    }

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