/* ============================================
   RuDao V2 - Book Website Styles
   Theme: Confluence of Eastern philosophy & modern business
   Sections: Hero, Concept, Book, Contents (16 ch), Editions,
   Pillars, Principles, Compare, Lineage+Quotes, Author, Pre-Order
   ============================================ */

:root {
    /* Color palette - inspired by ink, vermillion seal, and aged paper */
    --ink-black: #0a0a0a;
    --ink-soft: #1a1a1a;
    --ink-mid: #3a3a3a;
    --paper: #faf7f0;
    --paper-warm: #f3ede1;
    --paper-shadow: #e8e0cf;
    --vermillion: #a93226;
    --vermillion-deep: #7d2419;
    --gold: #b8923a;
    --gold-soft: #c9a961;
    --gray: #6b6b6b;
    --gray-light: #a8a8a8;

    /* Typography */
    --font-serif-en: 'Cormorant Garamond', 'Noto Serif SC', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-cn: 'Noto Serif SC', 'ZCOOL XiaoWei', serif;
    --font-brush: 'Ma Shan Zheng', 'ZCOOL XiaoWei', cursive;

    /* Layout */
    --container: 1240px;
    --section-py: clamp(5rem, 10vw, 8rem);
    --radius: 4px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.6;
    color: var(--ink-soft);
    background: var(--paper);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
}

.visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

/* ============================================
   AUDIOBOOK INTRO BAR (NEW V4)
   ============================================ */
.audio-intro-bar {
    position: relative;
    z-index: 200;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
    color: var(--paper);
    border-bottom: 1px solid rgba(185, 146, 58, 0.25);
    transition: max-height .4s ease, opacity .3s ease, margin .3s ease;
    overflow: hidden;
}
.audio-intro-bar.dismissed {
    max-height: 0 !important;
    border-bottom-color: transparent;
    opacity: 0;
    margin: 0;
    pointer-events: none;
}
.audio-intro-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0.65rem clamp(1.5rem, 4vw, 3rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: nowrap;
}
.audio-intro-left {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-shrink: 0;
}
.audio-play-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--vermillion);
    color: var(--paper);
    flex-shrink: 0;
    transition: all .25s ease;
    box-shadow: 0 2px 12px -2px rgba(169, 50, 38, 0.5);
}
.audio-play-btn:hover {
    background: var(--vermillion-deep);
    transform: scale(1.08);
}
.audio-play-btn.playing {
    background: var(--gold-soft);
    color: var(--ink-black);
    box-shadow: 0 2px 12px -2px rgba(185, 146, 58, 0.5);
}
.audio-play-btn .icon-pulse {
    animation: audioPulse 1.5s ease-in-out infinite;
}
@keyframes audioPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(169, 50, 38, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(169, 50, 38, 0); }
}
.audio-info {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    min-width: 0;
}
.audio-label {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gold-soft);
    white-space: nowrap;
}
.audio-title {
    font-size: 0.82rem;
    font-weight: 400;
    color: rgba(250, 247, 240, 0.85);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.audio-intro-right {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex: 1;
    justify-content: flex-end;
    min-width: 0;
}
.audio-progress-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    max-width: 400px;
}
.audio-time {
    font-size: 0.72rem;
    font-weight: 400;
    color: rgba(250, 247, 240, 0.55);
    white-space: nowrap;
    min-width: 32px;
    text-align: center;
}
.audio-progress {
    flex: 1;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: height .2s ease;
}
.audio-progress:hover { height: 6px; }
.audio-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--vermillion), var(--gold-soft));
    border-radius: 2px;
    transition: width .15s linear;
}
.audio-dismiss {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    border-radius: 50%;
    color: rgba(250, 247, 240, 0.5);
    transition: all .2s ease;
    flex-shrink: 0;
}
.audio-dismiss:hover {
    color: var(--paper);
    background: rgba(255, 255, 255, 0.08);
}

/* Responsive audio bar */
@media (max-width: 860px) {
    .audio-intro-inner {
        flex-wrap: wrap;
        gap: 0.5rem;
        padding: 0.5rem clamp(1rem, 4vw, 2rem);
    }
    .audio-title {
        font-size: 0.75rem;
        white-space: normal;
    }
    .audio-progress-wrap {
        max-width: 100%;
        width: 100%;
        order: 3;
        flex-basis: 100%;
    }
}
@media (max-width: 520px) {
    .audio-intro-left {
        flex: 1;
        min-width: 0;
    }
    .audio-info {
        overflow: hidden;
    }
    .audio-title {
        font-size: 0.7rem;
    }
}

/* ============================================
   NAV
   ============================================ */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(250, 247, 240, 0.85);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .3s ease, background .3s ease;
}
.nav.scrolled {
    border-bottom-color: rgba(10,10,10,0.08);
    background: rgba(250, 247, 240, 0.95);
}
.nav-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 1.1rem clamp(1.5rem, 4vw, 3rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}
.nav-brand {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
}
.brand-en {
    font-family: var(--font-brush);
    font-size: 1.7rem;
    color: var(--ink-black);
    letter-spacing: -0.02em;
}
.brand-cn {
    font-family: var(--font-cn);
    font-size: 1.2rem;
    color: var(--vermillion);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 1.8rem;
}
.nav-links a {
    font-size: 0.88rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--ink-mid);
    transition: color .2s ease;
    position: relative;
}
.nav-links a:not(.nav-cta)::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: -6px;
    height: 1px;
    background: var(--vermillion);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .3s ease;
}
.nav-links a:not(.nav-cta):hover { color: var(--vermillion); }
.nav-links a:not(.nav-cta):hover::after { transform: scaleX(1); }

.nav-cta {
    background: var(--ink-black);
    color: var(--paper) !important;
    padding: 0.55rem 1.2rem;
    border-radius: 999px;
    transition: background .2s ease, transform .2s ease;
}
.nav-cta:hover { background: var(--vermillion); transform: translateY(-1px); }

.nav-toggle {
    display: none;
    width: 32px; height: 32px;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
}
.nav-toggle span {
    display: block;
    width: 24px; height: 1.5px;
    background: var(--ink-black);
    transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--paper);
    padding: 6rem 2rem 4rem;
}
.hero-bg {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 30%, rgba(185, 146, 58, 0.08), transparent 70%),
        radial-gradient(ellipse 50% 40% at 80% 80%, rgba(169, 50, 38, 0.06), transparent 70%),
        var(--paper);
    z-index: 0;
}
.hero-bg::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(10,10,10,0.03) 1px, transparent 1px),
        radial-gradient(circle at 80% 70%, rgba(10,10,10,0.02) 1px, transparent 1px);
    background-size: 60px 60px, 90px 90px;
}

.hero-art {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
    pointer-events: none;
}
.hero-calligraphy {
    width: min(85vw, 1100px);
    opacity: 0.08;
    filter: grayscale(1) contrast(1.2);
    transform: rotate(-2deg);
    user-select: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 920px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--vermillion);
    margin-bottom: 2rem;
}
.eyebrow-line {
    width: 32px; height: 1px;
    background: var(--vermillion);
}

.hero-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 1.6rem;
}
.title-en {
    font-family: var(--font-brush);
    font-size: clamp(5rem, 14vw, 11rem);
    line-height: 0.95;
    color: var(--ink-black);
    letter-spacing: -0.04em;
    text-shadow: 0 4px 30px rgba(10,10,10,0.06);
}
.title-cn {
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(3.5rem, 9vw, 6rem);
    line-height: 1;
    color: var(--vermillion);
    letter-spacing: 0.04em;
}

.hero-subtitle-en {
    font-family: var(--font-serif-en);
    font-size: clamp(1.3rem, 2.8vw, 2rem);
    font-weight: 500;
    font-style: italic;
    color: var(--ink-soft);
    margin-bottom: 0.4rem;
}
.hero-subtitle-cn {
    font-family: var(--font-cn);
    font-size: clamp(1rem, 1.6vw, 1.2rem);
    font-weight: 500;
    color: var(--ink-mid);
    margin-bottom: 1.6rem;
    letter-spacing: 0.06em;
}
.hero-tagline {
    font-family: var(--font-serif-en);
    font-size: clamp(1.05rem, 1.8vw, 1.35rem);
    font-weight: 400;
    line-height: 1.55;
    color: var(--ink-mid);
    max-width: 640px;
    margin: 0 auto 2.6rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--gray);
    z-index: 2;
}
.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--gray-light), transparent);
    animation: scrollPulse 2.4s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%, 100% { opacity: 0.4; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.2); }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.95rem 2rem;
    font-size: 0.92rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    border-radius: 999px;
    transition: all .25s ease;
    border: 1.5px solid transparent;
    white-space: nowrap;
}
.btn-primary {
    background: var(--ink-black);
    color: var(--paper);
}
.btn-primary:hover {
    background: var(--vermillion);
    transform: translateY(-2px);
    box-shadow: 0 12px 30px -8px rgba(169, 50, 38, 0.4);
}
.btn-ghost {
    background: transparent;
    color: var(--ink-black);
    border-color: rgba(10,10,10,0.25);
}
.btn-ghost:hover {
    border-color: var(--ink-black);
    background: var(--ink-black);
    color: var(--paper);
}
.btn-outline {
    background: transparent;
    color: var(--ink-black);
    border-color: rgba(10,10,10,0.2);
}
.btn-outline:hover {
    background: var(--ink-black);
    color: var(--paper);
    border-color: var(--ink-black);
}

/* ============================================
   SECTION SHARED
   ============================================ */
.section {
    padding: var(--section-py) 0;
    position: relative;
}
.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto clamp(3rem, 6vw, 5rem);
}
.section-num {
    display: inline-block;
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: 1rem;
    color: var(--vermillion);
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}
.section-title {
    font-family: var(--font-serif-en);
    font-size: clamp(2.2rem, 4.5vw, 3.4rem);
    font-weight: 500;
    line-height: 1.15;
    color: var(--ink-black);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}
.section-subtitle {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(1.05rem, 1.6vw, 1.2rem);
    color: var(--ink-mid);
}
.section-subtitle em, em { font-style: italic; }

/* ============================================
   CONCEPT
   ============================================ */
.concept { background: var(--paper); }
.concept-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: stretch;
    margin-bottom: 4rem;
}
.concept-card {
    padding: clamp(2rem, 4vw, 3rem);
    border-radius: 8px;
    transition: transform .4s ease;
}
.concept-card-light {
    background: var(--paper-warm);
    border: 1px solid var(--paper-shadow);
}
.concept-card-dark {
    background: var(--ink-black);
    color: var(--paper);
}
.card-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}
.concept-card-light .card-label { color: var(--vermillion); }
.concept-card-dark .card-label { color: var(--gold-soft); }
.card-cn {
    font-family: var(--font-cn);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    letter-spacing: 0.08em;
}
.concept-card-dark .card-cn { color: var(--gold-soft); }
.concept-card h3 {
    font-family: var(--font-serif-en);
    font-size: clamp(1.5rem, 2.4vw, 2rem);
    font-weight: 500;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}
.concept-card p {
    font-size: 1rem;
    line-height: 1.7;
    opacity: 0.9;
}

.concept-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 70px;
    position: relative;
}
.divider-cn {
    font-family: var(--font-brush);
    font-size: 3rem;
    color: var(--vermillion);
    background: var(--paper);
    padding: 1rem 0.4rem;
    border-radius: 50%;
    box-shadow: 0 0 0 8px var(--paper);
    z-index: 2;
}
.concept-divider::before {
    content: '';
    position: absolute;
    left: 0; right: 0;
    top: 50%;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--vermillion), transparent);
}

.quote-block {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
    padding: 3rem 2rem;
    position: relative;
}
.quote-block::before {
    content: '\201C';
    font-family: var(--font-serif-en);
    font-size: 6rem;
    line-height: 0.5;
    color: var(--vermillion);
    opacity: 0.3;
    position: absolute;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
}
.quote {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(1.3rem, 2.4vw, 1.8rem);
    font-weight: 400;
    line-height: 1.4;
    color: var(--ink-black);
    margin-bottom: 1rem;
}
.quote-attr {
    font-size: 0.85rem;
    color: var(--gray);
    letter-spacing: 0.05em;
}

/* ============================================
   THE BOOK
   ============================================ */
.book { background: var(--paper-warm); }
.book-container {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: clamp(2.5rem, 6vw, 5rem);
    align-items: center;
}

.book-art {
    position: relative;
    display: flex;
    justify-content: center;
    perspective: 1500px;
}
.book-cover-real {
    position: relative;
    width: min(380px, 85vw);
    transform: rotateY(-14deg) rotateX(2deg);
    transform-style: preserve-3d;
    transition: transform .8s ease;
    filter: drop-shadow(20px 30px 50px rgba(10,10,10,0.3));
}
.book-cover-real:hover {
    transform: rotateY(-6deg) rotateX(1deg) translateY(-8px);
}
.book-cover-real img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}
.book-shadow {
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 30px;
    background: radial-gradient(ellipse, rgba(10,10,10,0.25), transparent 70%);
    filter: blur(10px);
    z-index: -1;
}

.book-info { padding-top: 1rem; }
.book-info .section-num { margin-bottom: 0.8rem; }
.book-info .section-title { text-align: left; }
.book-lead {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(1.15rem, 1.7vw, 1.35rem);
    color: var(--ink-black);
    margin: 1.5rem 0 1.5rem;
    line-height: 1.5;
}
.book-info p {
    font-size: 1.02rem;
    line-height: 1.75;
    margin-bottom: 1.1rem;
    color: var(--ink-mid);
}
.book-info p strong { color: var(--ink-black); font-weight: 600; }
.book-info p em { color: var(--vermillion); font-style: italic; font-weight: 500; }

.book-meta {
    list-style: none;
    margin-top: 2.2rem;
    border-top: 1px solid rgba(10,10,10,0.1);
}
.book-meta li {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(10,10,10,0.06);
    font-size: 0.95rem;
}
.book-meta span {
    color: var(--gray);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-top: 2px;
}
.book-meta strong { color: var(--ink-black); font-weight: 500; }

/* Book quote block — long Chinese + English description (NEW V3) */
.book-quote {
    margin: 1.5rem 0 1.8rem;
    padding: 1.4rem 1.6rem;
    background: rgba(169, 50, 38, 0.04);
    border-left: 3px solid var(--vermillion);
    border-radius: 0 6px 6px 0;
    position: relative;
}
.book-quote-cn {
    font-family: var(--font-cn);
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--ink-mid);
    margin-bottom: 1rem;
}
.book-quote-en {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--ink-mid);
    padding-top: 0.8rem;
    border-top: 1px solid rgba(10,10,10,0.08);
}

/* ============================================
   TABLE OF CONTENTS (NEW V2)
   ============================================ */
.contents {
    background: var(--paper);
    position: relative;
}
.contents::before {
    content: '\5112\9053';
    position: absolute;
    top: 5%;
    right: 3%;
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(8rem, 22vw, 18rem);
    color: var(--vermillion);
    opacity: 0.03;
    pointer-events: none;
    user-select: none;
}

.toc-part {
    margin-bottom: clamp(2.5rem, 5vw, 4rem);
    position: relative;
}
.toc-part:last-child { margin-bottom: 0; }

.toc-part-header {
    text-align: center;
    margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--vermillion);
    position: relative;
}
.toc-part-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: var(--vermillion);
}

.toc-part-alt .toc-part-header {
    border-bottom-color: var(--gold);
}
.toc-part-alt .toc-part-header::after {
    background: var(--gold);
}

.toc-part-num {
    display: inline-block;
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: 0.95rem;
    color: var(--vermillion);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 0.6rem;
}
.toc-part-alt .toc-part-num { color: var(--gold); }

.toc-part-title {
    font-family: var(--font-cn);
    font-weight: 700;
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    color: var(--ink-black);
    margin-bottom: 0.6rem;
    letter-spacing: 0.04em;
}
.toc-part-desc {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(0.95rem, 1.3vw, 1.1rem);
    color: var(--ink-mid);
    max-width: 600px;
    margin: 0 auto;
}

.toc-chapters {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.toc-chapter {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 1.2rem;
    padding: 1.4rem 1.5rem;
    background: var(--paper-warm);
    border: 1px solid var(--paper-shadow);
    border-radius: 8px;
    transition: all .3s ease;
    position: relative;
}
.toc-chapter:hover {
    border-color: rgba(169, 50, 38, 0.25);
    transform: translateY(-3px);
    box-shadow: 0 12px 30px -10px rgba(10,10,10,0.12);
}
.toc-chapter::before {
    content: '';
    position: absolute;
    top: 0; left: 0; bottom: 0;
    width: 3px;
    background: var(--vermillion);
    border-radius: 8px 0 0 8px;
    opacity: 0;
    transition: opacity .3s ease;
}
.toc-chapter:hover::before { opacity: 1; }

.toc-part-alt .toc-chapter {
    background: var(--ink-black);
    border-color: rgba(185, 146, 58, 0.15);
}
.toc-part-alt .toc-chapter:hover {
    border-color: rgba(185, 146, 58, 0.35);
}
.toc-part-alt .toc-chapter::before {
    background: var(--gold-soft);
}
.toc-part-alt .toc-chapter h4 { color: var(--paper); }
.toc-part-alt .toc-chapter p { color: rgba(250,247,240,0.7); }

.toc-ch-num {
    font-family: var(--font-serif-en);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--vermillion);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding-top: 3px;
}
.toc-part-alt .toc-ch-num { color: var(--gold-soft); }

.toc-ch-body h4 {
    font-family: var(--font-serif-en);
    font-size: clamp(1.05rem, 1.5vw, 1.2rem);
    font-weight: 600;
    color: var(--ink-black);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}
.toc-ch-body h4 em {
    font-family: var(--font-cn);
    font-style: normal;
    font-weight: 600;
    color: var(--vermillion);
}
.toc-part-alt .toc-ch-body h4 em { color: var(--gold-soft); }

.toc-ch-body p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--ink-mid);
}

/* ============================================
   EDITIONS / COVER DESIGNS
   ============================================ */
.editions {
    background: var(--paper);
    position: relative;
}
.editions::before {
    content: '\4E09';
    position: absolute;
    top: 5%;
    right: 4%;
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(8rem, 22vw, 18rem);
    color: var(--vermillion);
    opacity: 0.04;
    pointer-events: none;
    user-select: none;
}
.editions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: stretch;
}
.edition-card {
    background: var(--paper);
    border: 1px solid var(--paper-shadow);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all .4s ease;
    position: relative;
}
.edition-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(to right, transparent, var(--vermillion), transparent);
    opacity: 0;
    transition: opacity .4s ease;
}
.edition-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px -15px rgba(10,10,10,0.18);
    border-color: rgba(169, 50, 38, 0.2);
}
.edition-card:hover::before { opacity: 1; }

.edition-card-feature {
    background: var(--ink-black);
    color: var(--paper);
    border-color: rgba(185, 146, 58, 0.25);
}
.edition-card-feature::before {
    background: linear-gradient(to right, transparent, var(--gold-soft), transparent);
}
.edition-card-feature .edition-info h3 { color: var(--paper); }
.edition-card-feature .edition-info p { color: rgba(250,247,240,0.75); }
.edition-card-feature .edition-badge {
    background: var(--gold-soft);
    color: var(--ink-black);
}
.edition-card-feature .edition-specs { border-top-color: rgba(250,247,240,0.15); }
.edition-card-feature .edition-specs span { color: rgba(250,247,240,0.5); }
.edition-card-feature .edition-specs strong { color: var(--paper); }

.edition-image {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background: linear-gradient(180deg, #2a1f10 0%, #0a0a0a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}
.edition-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}
.edition-card:hover .edition-image img {
    transform: scale(1.05);
}
.edition-image-light {
    background: var(--paper-warm);
}

.edition-info {
    padding: clamp(1.5rem, 2.5vw, 2rem);
    display: flex;
    flex-direction: column;
    flex: 1;
}
.edition-badge {
    display: inline-block;
    align-self: flex-start;
    padding: 0.35rem 0.8rem;
    background: var(--vermillion);
    color: var(--paper);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    border-radius: 999px;
    margin-bottom: 1rem;
}
.edition-info h3 {
    font-family: var(--font-serif-en);
    font-size: clamp(1.3rem, 2vw, 1.6rem);
    font-weight: 600;
    color: var(--ink-black);
    margin-bottom: 0.8rem;
    line-height: 1.2;
}
.edition-info p {
    font-size: 0.95rem;
    line-height: 1.65;
    color: var(--ink-mid);
    margin-bottom: 1.4rem;
}
.edition-info p em { color: var(--vermillion); font-style: italic; }

.edition-specs {
    list-style: none;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid rgba(10,10,10,0.08);
}
.edition-specs li {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 0.6rem;
    padding: 0.5rem 0;
    font-size: 0.85rem;
}
.edition-specs span {
    color: var(--gray);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding-top: 2px;
}
.edition-specs strong {
    color: var(--ink-black);
    font-weight: 500;
}

/* ============================================
   FIVE PILLARS
   ============================================ */
.pillars { background: var(--paper-warm); position: relative; }
.pillars::before {
    content: '\4E94\5E38';
    position: absolute;
    top: 8%;
    right: 5%;
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(6rem, 18vw, 14rem);
    color: var(--vermillion);
    opacity: 0.04;
    pointer-events: none;
    user-select: none;
}
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.2rem;
}
.pillar {
    text-align: center;
    padding: 2.5rem 1.2rem;
    border: 1px solid transparent;
    border-radius: 8px;
    background: rgba(255,255,255,0.5);
    transition: all .4s ease;
    position: relative;
}
.pillar:hover {
    transform: translateY(-8px);
    border-color: rgba(169, 50, 38, 0.2);
    background: rgba(255,255,255,0.85);
    box-shadow: 0 20px 40px -15px rgba(10,10,10,0.15);
}
.pillar-glyph {
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: 3.8rem;
    line-height: 1;
    color: var(--vermillion);
    margin-bottom: 1.2rem;
    display: inline-block;
    transition: transform .4s ease;
}
.pillar:hover .pillar-glyph { transform: scale(1.15); }
.pillar h3 {
    font-family: var(--font-serif-en);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    color: var(--ink-black);
}
.pillar h3::after {
    content: '';
    display: block;
    width: 24px;
    height: 1px;
    background: var(--vermillion);
    margin: 0.8rem auto 1rem;
}
.pillar p {
    font-size: 0.92rem;
    line-height: 1.65;
    color: var(--ink-mid);
}

/* ============================================
   CORE PRINCIPLES (NEW V2)
   ============================================ */
.principles {
    background: var(--ink-black);
    color: var(--paper);
    position: relative;
}
.principles::before {
    content: '\539F\5219';
    position: absolute;
    top: 6%;
    left: 3%;
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(6rem, 18vw, 14rem);
    color: var(--gold-soft);
    opacity: 0.04;
    pointer-events: none;
    user-select: none;
}
.principles .section-title { color: var(--paper); }
.principles .section-subtitle { color: rgba(250,247,240,0.6); }

.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.principle {
    padding: clamp(2rem, 3.5vw, 2.8rem);
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 8px;
    transition: all .4s ease;
    position: relative;
    overflow: hidden;
}
.principle::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(to right, transparent, var(--gold-soft), transparent);
    opacity: 0;
    transition: opacity .4s ease;
}
.principle:hover {
    border-color: rgba(185, 146, 58, 0.25);
    transform: translateY(-6px);
    background: rgba(255,255,255,0.05);
}
.principle:hover::before { opacity: 1; }

.principle-center {
    background: rgba(169, 50, 38, 0.12);
    border-color: rgba(169, 50, 38, 0.25);
}
.principle-center::before {
    background: linear-gradient(to right, transparent, var(--vermillion), transparent);
}

.principle-num {
    font-family: var(--font-serif-en);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gold-soft);
    letter-spacing: 0.2em;
    margin-bottom: 1rem;
}
.principle-center .principle-num { color: var(--vermillion); }

.principle-glyph {
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(2.2rem, 4vw, 3rem);
    line-height: 1;
    color: var(--gold-soft);
    margin-bottom: 1.2rem;
    letter-spacing: 0.04em;
    transition: transform .4s ease;
}
.principle:hover .principle-glyph { transform: scale(1.06); }
.principle-center .principle-glyph { color: var(--vermillion); }

.principle h3 {
    font-family: var(--font-serif-en);
    font-size: clamp(1.3rem, 2vw, 1.6rem);
    font-weight: 600;
    color: var(--paper);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.principle p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: rgba(250,247,240,0.7);
    margin-bottom: 1rem;
}
.principle p strong {
    color: var(--paper);
    font-weight: 500;
}
.principle-cn {
    font-family: var(--font-cn);
    font-size: 0.88rem;
    color: rgba(250,247,240,0.5);
    font-style: normal !important;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 0.8rem;
    margin-top: 0.5rem;
    margin-bottom: 0;
}

/* ============================================
   COMPARE TABLE (NEW V2)
   ============================================ */
.compare {
    background: var(--paper);
    position: relative;
}
.compare-table-wrap {
    overflow-x: auto;
    margin-bottom: 3rem;
}
.compare-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 680px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 30px -12px rgba(10,10,10,0.12);
}
.compare-table thead {
    background: var(--ink-black);
}
.compare-table th {
    padding: 1.4rem 1.5rem;
    text-align: left;
    font-family: var(--font-serif-en);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--paper);
    vertical-align: middle;
}
.compare-col-label { width: 22%; }
.compare-col-old { width: 39%; border-left: 1px solid rgba(255,255,255,0.1); }
.compare-col-new {
    width: 39%;
    border-left: 1px solid rgba(255,255,255,0.1);
    color: var(--gold-soft);
}
.compare-col-cn {
    display: block;
    font-family: var(--font-cn);
    font-size: 0.85rem;
    font-weight: 400;
    opacity: 0.7;
    margin-top: 0.2rem;
}

.compare-table tbody tr {
    border-bottom: 1px solid var(--paper-shadow);
    transition: background .2s ease;
}
.compare-table tbody tr:nth-child(even) {
    background: var(--paper-warm);
}
.compare-table tbody tr:hover {
    background: rgba(169, 50, 38, 0.04);
}
.compare-table td {
    padding: 1.2rem 1.5rem;
    font-size: 0.95rem;
    line-height: 1.5;
    vertical-align: middle;
}
.compare-dim {
    font-family: var(--font-serif-en);
    font-weight: 600;
    color: var(--ink-black);
    font-size: 1rem;
}
.compare-dim-cn {
    display: block;
    font-family: var(--font-cn);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--gray);
    margin-top: 0.2rem;
}
.compare-col-old { color: var(--ink-mid); }
.compare-col-new { color: var(--vermillion); font-weight: 500; }
.compare-table td.compare-col-new { color: var(--vermillion); }
.compare-table td.compare-col-old { color: var(--ink-mid); }

.compare-note {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 1rem;
}
.compare-note p {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    line-height: 1.7;
    color: var(--ink-mid);
}
.compare-note p em {
    color: var(--vermillion);
    font-weight: 500;
}

/* ============================================
   LINEAGE / ROOTS
   ============================================ */
.lineage { background: var(--paper-warm); position: relative; }
.lineage::before {
    content: '\5112\9053';
    position: absolute;
    top: 6%;
    left: 3%;
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(6rem, 18vw, 14rem);
    color: var(--vermillion);
    opacity: 0.04;
    pointer-events: none;
    user-select: none;
}
.lineage-intro {
    max-width: 780px;
    margin: 0 auto clamp(3rem, 5vw, 4rem);
    text-align: center;
}
.lineage-intro p {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(1.1rem, 1.6vw, 1.25rem);
    line-height: 1.6;
    color: var(--ink-mid);
}
.lineage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.lineage-card {
    padding: clamp(2rem, 3.5vw, 2.8rem) clamp(1.5rem, 2.5vw, 2rem);
    background: var(--paper);
    border: 1px solid var(--paper-shadow);
    border-radius: 8px;
    text-align: center;
    transition: all .4s ease;
    position: relative;
    overflow: hidden;
}
.lineage-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(to right, transparent, var(--vermillion), transparent);
    opacity: 0;
    transition: opacity .4s ease;
}
.lineage-card:hover {
    transform: translateY(-6px);
    border-color: rgba(169, 50, 38, 0.25);
    box-shadow: 0 20px 40px -15px rgba(10,10,10,0.12);
}
.lineage-card:hover::after { opacity: 1; }
.lineage-card-center {
    background: var(--ink-black);
    color: var(--paper);
    border-color: rgba(185, 146, 58, 0.2);
}
.lineage-card-center::after {
    background: linear-gradient(to right, transparent, var(--gold-soft), transparent);
}
.lineage-glyph {
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: clamp(2.4rem, 4.5vw, 3.4rem);
    line-height: 1;
    color: var(--vermillion);
    margin-bottom: 1.4rem;
    letter-spacing: 0.04em;
    transition: transform .4s ease;
}
.lineage-card-center .lineage-glyph { color: var(--gold-soft); }
.lineage-card:hover .lineage-glyph { transform: scale(1.08); }
.lineage-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--vermillion);
    margin-bottom: 0.8rem;
}
.lineage-card-center .lineage-label { color: var(--gold-soft); }
.lineage-card h3 {
    font-family: var(--font-serif-en);
    font-size: clamp(1.3rem, 2vw, 1.6rem);
    font-weight: 600;
    color: var(--ink-black);
    margin-bottom: 1rem;
    line-height: 1.2;
}
.lineage-card-center h3 { color: var(--paper); }
.lineage-card p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--ink-mid);
}
.lineage-card-center p { color: rgba(250,247,240,0.75); }
.lineage-card p strong {
    font-family: var(--font-cn);
    font-weight: 700;
    color: var(--vermillion);
    letter-spacing: 0.04em;
}
.lineage-card-center p strong { color: var(--gold-soft); }

/* Key Quotes section */
.quotes-section {
    margin-top: clamp(3rem, 5vw, 5rem);
    padding-top: clamp(3rem, 5vw, 5rem);
    border-top: 1px solid var(--paper-shadow);
    text-align: center;
}
.quotes-title {
    font-family: var(--font-cn);
    font-weight: 700;
    font-size: clamp(1.3rem, 2vw, 1.6rem);
    color: var(--vermillion);
    margin-bottom: 2.5rem;
    letter-spacing: 0.06em;
}
.quotes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    text-align: left;
}
.key-quote {
    padding: 2rem 1.8rem;
    background: var(--paper);
    border: 1px solid var(--paper-shadow);
    border-radius: 8px;
    position: relative;
    transition: all .3s ease;
}
.key-quote:hover {
    border-color: rgba(169, 50, 38, 0.25);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px -10px rgba(10,10,10,0.12);
}
.key-quote::before {
    content: '\201C';
    position: absolute;
    top: 0.5rem;
    left: 0.8rem;
    font-family: var(--font-serif-en);
    font-size: 3rem;
    color: var(--vermillion);
    opacity: 0.15;
    line-height: 1;
}
.quote-cn {
    font-family: var(--font-cn);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--ink-black);
    margin-bottom: 0.6rem;
    letter-spacing: 0.04em;
    position: relative;
    z-index: 1;
}
.quote-en {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: 0.98rem;
    color: var(--ink-mid);
    line-height: 1.5;
}

/* ============================================
   AUTHOR
   ============================================ */
.author { background: var(--ink-black); color: var(--paper); }
.author .section-title { color: var(--paper); }
.author-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: clamp(3rem, 6vw, 5rem);
    align-items: center;
}
.author-portrait {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1;
    max-width: 380px;
    margin: 0 auto;
}
.portrait-frame {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 50%;
    background:
        radial-gradient(circle at 30% 30%, rgba(185,146,58,0.25), transparent 60%),
        linear-gradient(135deg, #2a2a2a, #0a0a0a);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(185,146,58,0.4);
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 50px -10px rgba(0,0,0,0.6),
                inset 0 0 0 1px rgba(185,146,58,0.1);
}
.portrait-frame::before {
    content: '';
    position: absolute;
    inset: 8px;
    border-radius: 50%;
    border: 1px solid rgba(185,146,58,0.25);
    z-index: 2;
    pointer-events: none;
}
/* V3: actual photo replaces the monogram */
.portrait-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%;
    border-radius: 50%;
    display: block;
    transition: transform .6s ease;
    filter: contrast(1.05) saturate(1.05);
}
.author-portrait:hover .portrait-photo {
    transform: scale(1.03);
}
.portrait-stamp {
    position: absolute;
    bottom: -10px;
    right: -10px;
    width: 80px; height: 80px;
    background: var(--vermillion);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-cn);
    font-weight: 900;
    font-size: 2.4rem;
    color: var(--paper);
    transform: rotate(-8deg);
    box-shadow: 0 10px 25px rgba(169, 50, 38, 0.4);
}

.author-info .section-num { color: var(--gold-soft); }
.author-name {
    font-family: var(--font-serif-en);
    font-size: clamp(2rem, 3.5vw, 2.8rem);
    font-weight: 500;
    margin: 1rem 0 0.4rem;
    color: var(--paper);
}
.author-name-cn {
    font-family: var(--font-cn);
    font-weight: 600;
    color: var(--gold-soft);
    font-size: 0.85em;
    margin-left: 0.4rem;
}
.author-role {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: 1.05rem;
    color: var(--gold-soft);
    margin-bottom: 1.6rem;
}
.author-info p {
    font-size: 1.02rem;
    line-height: 1.75;
    color: rgba(250,247,240,0.75);
    margin-bottom: 1rem;
    max-width: 640px;
}
.author-info p strong { color: var(--paper); font-weight: 500; }
.author-info p em { color: var(--gold-soft); font-style: italic; }

/* Author credentials grid (NEW V2) */
.author-credentials {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(250,247,240,0.1);
}
.credential {
    padding: 1rem 1.2rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 6px;
    transition: all .3s ease;
}
.credential:hover {
    border-color: rgba(185, 146, 58, 0.2);
    background: rgba(255,255,255,0.05);
}
.credential-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gold-soft);
    margin-bottom: 0.4rem;
}
.credential strong {
    font-family: var(--font-serif-en);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--paper);
}

/* Author "Also" tags (NEW V3) */
.author-extra {
    margin-top: 1.8rem;
}
.extra-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: rgba(250,247,240,0.4);
    margin-bottom: 0.6rem;
}
.extra-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.tag {
    padding: 0.4rem 0.85rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 999px;
    font-size: 0.78rem;
    color: rgba(250,247,240,0.7);
    transition: all .25s ease;
}
.tag:hover {
    border-color: rgba(185, 146, 58, 0.3);
    color: var(--gold-soft);
    background: rgba(185, 146, 58, 0.06);
}

.author-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}
.author .btn-outline {
    color: var(--paper);
    border-color: rgba(250,247,240,0.3);
}
.author .btn-outline:hover {
    background: var(--paper);
    color: var(--ink-black);
    border-color: var(--paper);
}

.author-social {
    margin-top: 2.2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(250,247,240,0.12);
}
.social-label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(250,247,240,0.5);
    margin-bottom: 1rem;
}
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}
.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    border: 1px solid rgba(250,247,240,0.18);
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 500;
    color: rgba(250,247,240,0.75);
    transition: all .25s ease;
}
.social-link svg {
    flex-shrink: 0;
    opacity: 0.8;
    transition: opacity .25s ease;
}
.social-link:hover {
    border-color: var(--gold-soft);
    color: var(--gold-soft);
    transform: translateY(-2px);
}
.social-link:hover svg { opacity: 1; }

/* ============================================
   PRE-ORDER
   ============================================ */
.preorder {
    background: var(--paper-warm);
    position: relative;
    overflow: hidden;
}
.preorder::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 0% 50%, rgba(169,50,38,0.04), transparent 50%);
}
.preorder-container {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: clamp(2.5rem, 5vw, 5rem);
    align-items: center;
    position: relative;
    z-index: 1;
}
.preorder-art {
    display: flex;
    align-items: center;
    justify-content: center;
}
.preorder-art img {
    width: min(100%, 320px);
    filter: drop-shadow(0 20px 40px rgba(10,10,10,0.15));
}
.preorder-content .section-num { display: inline-block; }
.preorder-content .section-title { text-align: left; }
.preorder-lead {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: clamp(1.15rem, 1.7vw, 1.3rem);
    color: var(--ink-mid);
    margin: 1.5rem 0 2rem;
    line-height: 1.5;
    max-width: 540px;
}
.preorder-form {
    display: flex;
    gap: 0.6rem;
    max-width: 480px;
    margin-bottom: 1rem;
}
.preorder-form input {
    flex: 1;
    padding: 0.95rem 1.2rem;
    font-size: 0.95rem;
    border: 1.5px solid rgba(10,10,10,0.15);
    border-radius: 999px;
    background: var(--paper);
    color: var(--ink-black);
    transition: border-color .2s ease;
    font-family: inherit;
}
.preorder-form input:focus {
    outline: none;
    border-color: var(--vermillion);
}
.preorder-form input::placeholder { color: var(--gray-light); }
.preorder-form .btn { padding: 0.95rem 1.6rem; }
.preorder-note {
    font-size: 0.85rem;
    color: var(--gray);
    margin-bottom: 2.5rem;
    letter-spacing: 0.02em;
}
.preorder-formats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 540px;
}
.format {
    padding: 1.2rem 0.8rem;
    background: rgba(255,255,255,0.6);
    border: 1px solid rgba(10,10,10,0.06);
    border-radius: 8px;
    text-align: center;
    transition: all .3s ease;
}
.format:hover {
    border-color: var(--vermillion);
    transform: translateY(-3px);
}
.format-icon {
    font-size: 1.8rem;
    display: block;
    margin-bottom: 0.4rem;
}
.format strong {
    display: block;
    font-family: var(--font-serif-en);
    font-weight: 600;
    color: var(--ink-black);
    font-size: 1rem;
    margin-bottom: 0.2rem;
}
.format small {
    font-size: 0.78rem;
    color: var(--gray);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--ink-black);
    color: var(--paper);
    padding: 4rem 0 2rem;
}
.footer-inner {
    display: grid;
    grid-template-columns: 1fr 1.5fr 1fr;
    gap: 2rem;
    align-items: start;
}
.footer-brand .brand-en { color: var(--paper); font-size: 2rem; }
.footer-brand .brand-cn { font-size: 1.4rem; }
.footer-brand p {
    font-family: var(--font-serif-en);
    font-style: italic;
    color: rgba(250,247,240,0.6);
    margin-top: 0.4rem;
    font-size: 0.95rem;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem 2rem;
    justify-content: center;
}
.footer-links a {
    font-size: 0.9rem;
    color: rgba(250,247,240,0.7);
    transition: color .2s ease;
}
.footer-links a:hover { color: var(--gold-soft); }
.footer-meta {
    text-align: right;
    font-size: 0.82rem;
    color: rgba(250,247,240,0.5);
}
.footer-tagline {
    font-family: var(--font-cn);
    margin-top: 0.4rem;
    color: var(--vermillion) !important;
    opacity: 0.7;
    letter-spacing: 0.08em;
}

.footer-social {
    display: flex;
    gap: 0.6rem;
    margin-bottom: 1.2rem;
    justify-content: flex-end;
}
.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(250,247,240,0.18);
    color: rgba(250,247,240,0.6);
    transition: all .25s ease;
}
.footer-social a:hover {
    border-color: var(--gold-soft);
    color: var(--gold-soft);
    transform: translateY(-3px);
    background: rgba(185,146,58,0.08);
}

/* ============================================
   SCROLL REVEAL
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .8s ease, transform .8s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .nav-links { gap: 1.2rem; }
    .nav-links a { font-size: 0.82rem; }
    .pillars-grid { grid-template-columns: repeat(3, 1fr); }
    .toc-chapters { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
    .nav-links {
        position: fixed;
        top: 65px; left: 0; right: 0;
        flex-direction: column;
        align-items: stretch;
        background: var(--paper);
        padding: 2rem clamp(1.5rem, 4vw, 3rem);
        border-bottom: 1px solid rgba(10,10,10,0.08);
        gap: 1.2rem;
        transform: translateY(-110%);
        opacity: 0;
        transition: transform .35s ease, opacity .35s ease;
        max-height: calc(100vh - 65px);
        overflow-y: auto;
    }
    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
    }
    .nav-toggle { display: flex; }
    .concept-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .concept-divider {
        width: 100%;
        height: 50px;
    }
    .concept-divider::before {
        left: 0; right: 0;
        top: 50%;
        height: 1px;
        background: linear-gradient(to right, transparent, var(--vermillion), transparent);
    }
    .book-container {
        grid-template-columns: 1fr;
    }
    .book-art { margin-bottom: 2rem; }
    .pillars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .editions-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    .lineage-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    .principles-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    .quotes-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    .author-container {
        grid-template-columns: 1fr;
    }
    .author-portrait { max-width: 260px; }
    .author-credentials {
        grid-template-columns: 1fr;
    }
    .preorder-container {
        grid-template-columns: 1fr;
    }
    .preorder-art { display: none; }
    .footer-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-meta { text-align: center; }
    .footer-social { justify-content: center; }
    .footer-brand, .footer-links { justify-content: center; }
    .footer-brand { display: flex; flex-direction: column; align-items: center; }
    .footer-links { gap: 0.8rem 1.2rem; }
}

@media (max-width: 520px) {
    .pillars-grid { grid-template-columns: 1fr; }
    .book-meta li {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }
    .preorder-formats { grid-template-columns: 1fr; }
    .preorder-form {
        flex-direction: column;
    }
    .book-cover-real {
        transform: rotateY(-8deg);
        width: min(300px, 80vw);
    }
    .toc-chapter {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }
}

/* ============================================
   PRINT
   ============================================ */
@media print {
    .nav, .hero-scroll, .nav-cta, .btn { display: none; }
    body { background: white; color: black; }
}