/* ═══════════════════════════════════════════════════════════
   Entropy — Official Website Stylesheet
   Design Language: 黑白墨风 · Ink Wash Minimalism
   如蒙娜丽莎般 —— 神秘、优雅、简约、极致
   ═══════════════════════════════════════════════════════════ */

/* ─── Design Tokens ──────────────────────────────────────── */
:root {
    /* 墨色系 — Ink Palette */
    --ink-black: #0A0A0A;
    --ink-deep: #141414;
    --ink-dark: #1A1A1A;
    --ink-medium: #3A3A3A;
    --ink-light: #6B6B6B;
    --ink-wash: #999999;

    /* 纸色系 — Paper Palette */
    --paper-white: #F5F3EF;
    --paper-warm: #EBE8E2;
    --paper-cream: #E0DDD6;
    --paper-pure: #FAFAF8;

    /* 金箔 — The Mona Lisa's secret glow */
    --gold-subtle: #C9A84C;
    --gold-light: rgba(201, 168, 76, 0.15);
    --gold-whisper: rgba(201, 168, 76, 0.06);

    /* 功能色 — 极度克制，仅用于数据 */
    --accent-loss: #C0392B;
    /* 熵增：深沉的暗红，而非刺眼的亮红 */
    --accent-gain: #2D6A4F;
    /* 负熵：沉稳的墨绿，生命的颜色 */
    --accent-neutral: #5C5C5C;

    /* Typography */
    --font-serif: 'Cormorant Garamond', 'Georgia', 'Noto Serif SC', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

    /* Spacing */
    --section-padding: clamp(100px, 14vw, 200px);
    --container-max: 1100px;
    --container-padding: clamp(24px, 6vw, 48px);

    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-base: 0.5s var(--ease-out-expo);
    --transition-slow: 1s var(--ease-out-expo);
}

/* ─── Reset & Base ───────────────────────────────────────── */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    background: var(--ink-black);
    color: var(--paper-white);
    line-height: 1.7;
    height: 100%;
    overflow: hidden;
    margin: 0;
}

/* ─── 整页滚动吸附 — Full-Page Scroll Snap ──────── */
.scroll-container {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

section {
    scroll-snap-align: start;
    min-height: 100vh;
}

.scroll-container>footer {
    scroll-snap-align: end;
}

::selection {
    background: rgba(255, 255, 255, 0.15);
    color: var(--paper-white);
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ─── Section Header (Reusable) ──────────────────────────── */
.section-header {
    text-align: center;
    margin-bottom: clamp(56px, 7vw, 96px);
}

.section-header__overtitle {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: 24px;
    opacity: 0.35;
}

.section-header__title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    font-weight: 400;
    line-height: 1.25;
    letter-spacing: -0.01em;
}

.section-header__title--zh {
    font-weight: 400;
    font-size: 0.55em;
    opacity: 0.5;
    display: block;
    margin-top: 12px;
    letter-spacing: 0.08em;
    font-family: var(--font-sans);
}

/* ─── Navigation ─────────────────────────────────────────── */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 var(--container-padding);
    transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.nav--scrolled {
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.nav__container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 1.3rem;
    letter-spacing: 0.02em;
}

.nav__logo-icon {
    font-size: 1.2rem;
    opacity: 0.6;
    animation: logoPulse 6s ease-in-out infinite;
}

@keyframes logoPulse {

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

    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav__link {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 400;
    opacity: 0.4;
    transition: opacity var(--transition-base);
    letter-spacing: 0.03em;
}

.nav__link:hover {
    opacity: 0.9;
}

.nav__link--cta {
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--paper-white);
    padding: 8px 24px;
    border-radius: 100px;
    opacity: 0.7;
    transition: all var(--transition-base);
}

.nav__link--cta:hover {
    background: var(--paper-white);
    color: var(--ink-black);
    opacity: 1;
}

.nav__mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav__mobile-toggle span {
    display: block;
    width: 22px;
    height: 1px;
    background: var(--paper-white);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ─── Hero Section ───────────────────────────────────────── */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero__particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* 维特鲁威人 — 文艺复兴的幽灵，隐约浮现，如古画上的灵魂在呼吸 */
.hero__vitruvian {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: clamp(360px, 55vw, 680px);
    height: clamp(360px, 55vw, 680px);
    z-index: 0;
    pointer-events: none;
    -webkit-mask-image: radial-gradient(ellipse 75% 75% at center, black 30%, transparent 72%);
    mask-image: radial-gradient(ellipse 75% 75% at center, black 30%, transparent 72%);
    animation: vitruvianBreathe 8s ease-in-out infinite;
}

@keyframes vitruvianBreathe {

    0%,
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
        filter: sepia(0.2) brightness(0.7);
    }

    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.02);
        filter: sepia(0.35) brightness(0.85);
    }
}

.hero__vitruvian-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.35;
    transition: opacity 2s ease;
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 760px;
    padding: 0 var(--container-padding);
}

.hero__overtitle {
    font-family: var(--font-mono);
    font-size: clamp(0.65rem, 1vw, 0.75rem);
    letter-spacing: 0.35em;
    text-transform: uppercase;
    opacity: 0.45;
    margin-bottom: 36px;
}

.hero__title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    font-weight: 400;
    line-height: 1.12;
    letter-spacing: -0.02em;
    margin-bottom: 28px;
}

/* 英文标题 — 微妙的金箔渐变光泽，蒙娜丽莎的内敛光芒 */
.hero__title-line:first-child {
    display: block;
    background: linear-gradient(135deg,
            var(--paper-white) 0%,
            rgba(201, 168, 76, 0.5) 25%,
            var(--paper-white) 50%,
            rgba(201, 168, 76, 0.35) 75%,
            var(--paper-white) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shimmerText 8s linear infinite, heroTitleEnter 1.8s var(--ease-out-expo) 0.2s both;
}

@keyframes shimmerText {
    0% {
        background-position: 0% center;
    }

    100% {
        background-position: 200% center;
    }
}

@keyframes heroTitleEnter {
    0% {
        opacity: 0;
        transform: translateY(18px);
        filter: blur(4px);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

.hero__title-line {
    display: block;
}

.hero__title-line--zh {
    font-family: var(--font-sans);
    font-size: 0.32em;
    font-weight: 400;
    opacity: 0;
    margin-top: 20px;
    letter-spacing: 0.12em;
    -webkit-text-fill-color: initial;
    background: none;
    animation: fadeInZh 1.5s var(--ease-out-expo) 1.6s forwards;
}

@keyframes fadeInZh {
    to {
        opacity: 0.45;
    }
}

.hero__subtitle {
    font-size: clamp(0.9rem, 1.6vw, 1.05rem);
    opacity: 0.55;
    line-height: 2;
    margin-bottom: 56px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.hero__cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ─── Buttons — 极简墨线风格 + 微光扫过 ──────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.85rem;
    padding: 14px 32px;
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    color: var(--paper-white);
    cursor: pointer;
    transition: all var(--transition-base);
    letter-spacing: 0.04em;
    position: relative;
    overflow: hidden;
}

/* 微光扫过效果 — 如月光掠过古画表面 */
.btn::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -100%;
    width: 60%;
    height: 200%;
    background: linear-gradient(90deg,
            transparent,
            rgba(255, 255, 255, 0.06),
            transparent);
    transform: skewX(-20deg);
    transition: left 0.8s var(--ease-out-expo);
    pointer-events: none;
}

.btn:hover::after {
    left: 130%;
}

.btn:hover {
    background: var(--paper-white);
    color: var(--ink-black);
    border-color: var(--paper-white);
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.06);
}

.btn--primary {
    background: transparent;
    color: var(--paper-white);
}

.btn--large {
    padding: 18px 40px;
    font-size: 0.88rem;
}

.btn__icon {
    width: 18px;
    height: 18px;
    opacity: 0.7;
    transition: transform var(--transition-base);
}

.btn:hover .btn__icon {
    opacity: 1;
    transform: scale(1.08);
}

/* ─── Buttons on light background ────────────────────────── */
.ambient-toggle {
    position: fixed;
    right: clamp(18px, 3vw, 32px);
    bottom: clamp(18px, 3vw, 32px);
    z-index: 1100;
    width: 48px;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: rgba(245, 243, 239, 0.62);
    background: rgba(10, 10, 10, 0.42);
    border: 1px solid rgba(245, 243, 239, 0.14);
    border-radius: 50%;
    backdrop-filter: saturate(160%) blur(18px);
    -webkit-backdrop-filter: saturate(160%) blur(18px);
    cursor: pointer;
    transition:
        color var(--transition-base),
        border-color var(--transition-base),
        background var(--transition-base),
        box-shadow var(--transition-base),
        transform var(--transition-base);
}

.ambient-toggle:hover,
.ambient-toggle:focus-visible {
    color: var(--paper-white);
    border-color: rgba(201, 168, 76, 0.42);
    background: rgba(10, 10, 10, 0.66);
    box-shadow: 0 0 32px rgba(201, 168, 76, 0.12);
    outline: none;
}

.ambient-toggle:focus-visible {
    outline: 1px solid rgba(201, 168, 76, 0.5);
    outline-offset: 4px;
}

.ambient-toggle--active {
    color: var(--gold-subtle);
    border-color: rgba(201, 168, 76, 0.55);
    background: rgba(18, 16, 12, 0.72);
    box-shadow:
        0 0 26px rgba(201, 168, 76, 0.16),
        inset 0 0 18px rgba(201, 168, 76, 0.06);
}

.ambient-toggle--primed {
    border-color: rgba(201, 168, 76, 0.26);
}

.ambient-toggle--unavailable {
    opacity: 0.35;
    cursor: not-allowed;
}

.ambient-toggle__icon {
    width: 23px;
    height: 23px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.35;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.ambient-toggle__chime {
    opacity: 0.72;
}

.ambient-toggle--active .ambient-toggle__chime {
    animation: ambientChimeSway 3.8s ease-in-out infinite;
    transform-origin: 16px 7px;
}

@keyframes ambientChimeSway {
    0%,
    100% {
        transform: rotate(0deg);
    }

    45% {
        transform: rotate(4deg);
    }

    70% {
        transform: rotate(-2.5deg);
    }
}

.download .btn {
    border-color: rgba(10, 10, 10, 0.2);
    color: var(--ink-black);
}

.download .btn:hover {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
}

/* Hero scroll indicator — 底部滚动引导 */
.hero__scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    animation: scrollBounce 2.5s ease-in-out infinite;
}

.hero__scroll-text {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    opacity: 0.25;
}

.hero__scroll-chevron {
    width: 16px;
    height: 16px;
    opacity: 0.3;
}

@keyframes scrollBounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
        opacity: 0.6;
    }

    50% {
        transform: translateX(-50%) translateY(8px);
        opacity: 1;
    }
}

/* Hero public launch signal */
.hero__launch-signal {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin-top: 38px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    padding: 18px 22px;
    border: 1px solid rgba(245, 243, 239, 0.13);
    background: rgba(8, 8, 7, 0.36);
    backdrop-filter: blur(12px);
}

.hero__launch-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: rgba(245, 243, 239, 0.5);
}

.hero__launch-title {
    font-family: var(--font-serif);
    font-size: clamp(1.35rem, 2.7vw, 2.15rem);
    font-weight: 500;
    letter-spacing: 0;
    line-height: 1.08;
    background: linear-gradient(135deg, var(--paper-white) 0%, var(--gold-subtle) 60%, var(--paper-white) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__launch-subtitle {
    max-width: 480px;
    font-size: 0.86rem;
    line-height: 1.6;
    color: rgba(245, 243, 239, 0.56);
}

.hero__launch-subtitle--zh {
    font-family: var(--font-sans);
    font-size: 0.82rem;
    line-height: 1.6;
    color: rgba(245, 243, 239, 0.38);
}

.hero__medical-note {
    max-width: 680px;
    margin: 22px auto 0;
    font-size: 0.68rem;
    line-height: 1.8;
    color: rgba(245, 243, 239, 0.42);
}

/* ─── Section 过渡带 — 黑白之间的呼吸 ────────────────────── */
.concept::before,
.data::before,
.download::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--ink-black), var(--paper-white));
    pointer-events: none;
}

.features::before,
.vision::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--paper-white), var(--ink-black));
    pointer-events: none;
}

/* ─── Concept Section — 纸白背景 ─────────────────────────── */
.concept {
    padding: var(--section-padding) 0;
    background: var(--paper-white);
    color: var(--ink-black);
    position: relative;
    overflow: hidden;
}

/* Matsys《The Moneylender and His Wife》— 古典银行家 */
.concept__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/moneylender.jpg') center center / cover no-repeat;
    opacity: 0.12;
    filter: grayscale(50%) sepia(20%) blur(0.5px);
    pointer-events: none;
    z-index: 0;
}

.concept>*:not(.concept__atmosphere) {
    position: relative;
    z-index: 1;
}

.concept .section-header__overtitle {
    opacity: 0.3;
    color: var(--ink-black);
}

.concept .section-header__title {
    color: var(--ink-black);
}

.concept .section-header__title--zh {
    opacity: 0.25;
}

.concept__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: rgba(245, 241, 235, 0.3);
}

.concept__card {
    background: rgba(252, 250, 247, 0.45);
    padding: clamp(32px, 4vw, 56px) clamp(24px, 3vw, 40px);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
}

/* 卡片顶部金色装饰线 — hover时如金箔浮现 */
.concept__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-subtle), transparent);
    transition: width 0.8s var(--ease-out-expo);
}

.concept__card:hover::before {
    width: 60%;
}

.concept__card:hover {
    background: var(--paper-pure);
}

.concept__card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.concept__card-icon--deposit,
.concept__card-icon--withdraw,
.concept__card-icon--balance {
    opacity: 0.5;
}

.concept__card-title {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 500;
    margin-bottom: 4px;
    letter-spacing: 0.02em;
}

.concept__card-title--zh {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    opacity: 0.45;
    margin-bottom: 20px;
    letter-spacing: 0.08em;
}

.concept__card-desc {
    font-size: 0.88rem;
    color: var(--ink-medium);
    line-height: 1.8;
    margin-bottom: 28px;
}

.concept__card-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.concept__card-value--neg {
    color: var(--accent-gain);
}

.concept__card-value--green {
    color: #2ecc71;
}

.concept__card-value--pos {
    color: var(--accent-loss);
}

.concept__card-value--balance {
    color: var(--ink-black);
}

.concept__card-value--gold {
    background: linear-gradient(135deg, #C9A84C 0%, #e6c97a 50%, #C9A84C 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ─── 一杯奶茶的代价 — 对比冲击区 ────────────────────────── */
.concept__compare {
    display: flex;
    align-items: center;
    gap: clamp(32px, 5vw, 64px);
    margin-top: clamp(64px, 8vw, 96px);
    padding-top: clamp(48px, 6vw, 72px);
    border-top: 1px solid var(--paper-cream);
}

.concept__compare-demo {
    flex: 0 0 auto;
    text-align: center;
    min-width: 180px;
}

.concept__milktea {
    opacity: 0.5;
    margin-bottom: 20px;
    transition: opacity 0.6s ease;
}

.concept__compare:hover .concept__milktea {
    opacity: 0.8;
}

.concept__counter {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.concept__counter-value {
    font-family: var(--font-mono);
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 700;
    color: var(--accent-loss);
    letter-spacing: -0.03em;
}

.concept__counter-unit {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    opacity: 0.5;
}

.concept__counter-label {
    font-size: 0.72rem;
    opacity: 0.35;
    margin-top: 8px;
    line-height: 1.7;
}

.concept__compare-table {
    flex: 1;
}

.concept__compare-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    margin-bottom: 1px;
}

.concept__compare-header span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0.35;
    padding: 12px 20px;
    background: var(--paper-cream);
}

.concept__compare-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    margin-bottom: 1px;
}

.concept__compare-cell {
    padding: 20px;
    font-size: 0.88rem;
    line-height: 1.7;
    background: var(--paper-cream);
    transition: background 0.4s ease;
}

.concept__compare-cell--old {
    opacity: 0.5;
}

.concept__compare-cell--new {
    font-weight: 500;
    color: var(--ink-black);
    background: rgba(201, 168, 76, 0.06);
    border-left: 2px solid var(--gold-subtle);
}

@media (max-width: 768px) {
    .concept__compare {
        flex-direction: column;
    }
}


/* ─── Fate Wheel Section — 命运之轮 ────────────── */
.fate {
    min-height: 100vh;
    padding: clamp(40px, 5vh, 80px) 0;
    background: var(--ink-black);
    color: var(--paper-white);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Goya《Atropos》背景 — 低透明度的文艺复兴暗色氛围 */
.fate__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/moirai.jpg') center center / cover no-repeat;
    opacity: 0.25;
    filter: grayscale(30%) blur(0.5px);
    pointer-events: none;
    z-index: 0;
}

.fate>*:not(.fate__atmosphere) {
    position: relative;
    z-index: 1;
}

/* 标题区域 */
.fate__header {
    text-align: center;
    margin-bottom: clamp(16px, 3vh, 36px);
}

.fate__title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 300;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

.fate__title--zh {
    font-family: var(--font-sans);
    font-size: 0.82rem;
    opacity: 0.6;
    letter-spacing: 0.12em;
    margin-bottom: 28px;
}

.fate__narrative {
    font-family: var(--font-serif);
    font-size: 0.92rem;
    font-style: italic;
    opacity: 0.8;
    line-height: 1.9;
    letter-spacing: 0.02em;
}

.fate__narrative em {
    color: var(--gold-subtle);
    font-style: italic;
}

.fate__narrative--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.6;
    margin-top: 10px;
    letter-spacing: 0.06em;
    line-height: 1.8;
}

/* 轮盘舞台 — 铺满视口 */
.fate__stage {
    width: 100%;
    display: flex;
    justify-content: center;
    flex: 1;
    align-items: center;
    margin-bottom: clamp(20px, 3vh, 40px);
}

.fate__wheel {
    --wheel-r: clamp(200px, 38vmin, 360px);
    position: relative;
    width: calc(var(--wheel-r) * 2 + 180px);
    height: calc(var(--wheel-r) * 2 + 180px);
}

/* 金色圆环 */
.fate__ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: calc(var(--wheel-r) * 2);
    height: calc(var(--wheel-r) * 2);
    transform: translate(-50%, -50%);
    border: 1px solid rgba(201, 168, 76, 0.12);
    border-radius: 50%;
    animation: fateRingSpin 120s linear infinite;
}

.fate__ring--inner {
    width: calc(var(--wheel-r) * 1.3);
    height: calc(var(--wheel-r) * 1.3);
    border-color: rgba(201, 168, 76, 0.06);
    animation-direction: reverse;
    animation-duration: 180s;
}

@keyframes fateRingSpin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* 中心内容 */
.fate__center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: calc(var(--wheel-r) * 1.1);
    text-align: center;
    z-index: 2;
}

.fate__center-default,
.fate__center-detail {
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.fate__center-detail {
    opacity: 0;
    transform: translateY(8px);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    pointer-events: none;
}

.fate.wheel-active .fate__center-default {
    opacity: 0;
    transform: translateY(-8px);
}

.fate.wheel-active .fate__center-detail {
    opacity: 1;
    transform: translateY(0);
}

.fate__center-mark {
    font-size: 1.6rem;
    color: var(--gold-subtle);
    opacity: 0.3;
    margin-bottom: 16px;
    animation: fatePulse 4s ease-in-out infinite;
}

@keyframes fatePulse {

    0%,
    100% {
        opacity: 0.2;
        transform: scale(1);
    }

    50% {
        opacity: 0.4;
        transform: scale(1.05);
    }
}

.fate__center-quote {
    font-family: var(--font-serif);
    font-size: 0.88rem;
    font-style: italic;
    opacity: 0.85;
    line-height: 1.8;
    letter-spacing: 0.02em;
}

.fate__center-quote--zh {
    font-family: var(--font-sans);
    font-size: 0.68rem;
    opacity: 0.6;
    margin-top: 10px;
    letter-spacing: 0.06em;
    line-height: 1.8;
}

/* Detail content (shown on hover) */
.fate__detail-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

.fate__detail-name--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.6;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.fate__detail-desc {
    font-size: 0.82rem;
    opacity: 0.85;
    line-height: 1.7;
    margin-bottom: 4px;
}

.fate__detail-desc--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.6;
    margin-bottom: 16px;
    line-height: 1.6;
}

.fate__detail-source {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    letter-spacing: 0.06em;
    color: var(--gold-subtle);
    padding: 4px 14px;
    border: 1px solid rgba(201, 168, 76, 0.25);
    border-radius: 100px;
}

/* ─── 13 Thread Points ─── */
.fate__thread {
    --angle: calc(var(--i) * 27.6923deg);
    position: absolute;
    left: calc(50% + var(--wheel-r) * sin(var(--angle)));
    top: calc(50% - var(--wheel-r) * cos(var(--angle)));
    transform: translate(-50%, -50%);
    text-align: center;
    cursor: pointer;
    z-index: 3;
    transition: opacity 0.4s ease;
}

/* 金色连接线 — 从点位指向中心 */
.fate__thread::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -0.5px;
    width: 0;
    height: 1px;
    transform-origin: 0 50%;
    transform: rotate(calc(var(--angle) + 90deg));
    background: linear-gradient(90deg, rgba(201, 168, 76, 0.5), rgba(201, 168, 76, 0.08), transparent);
    transition: width 0.8s var(--ease-out-expo), opacity 0.6s ease;
    opacity: 0;
    pointer-events: none;
}

.fate__thread.active::before {
    width: var(--wheel-r);
    opacity: 1;
}

/* 其余点暗淡 */
.fate.wheel-active .fate__thread:not(.active) {
    opacity: 0.35;
}

.fate__thread-dot {
    display: block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--gold-subtle);
    margin: 0 auto 8px;
    opacity: 0.85;
    transition: all 0.5s var(--ease-out-expo);
    box-shadow: 0 0 0 0 rgba(201, 168, 76, 0);
    animation: fateDotBreathe 6s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.4s);
}

.fate__thread.active .fate__thread-dot {
    opacity: 1;
    width: 12px;
    height: 12px;
    box-shadow: 0 0 20px 4px rgba(201, 168, 76, 0.3);
    animation: none;
}

@keyframes fateDotBreathe {

    0%,
    100% {
        opacity: 0.6;
    }

    50% {
        opacity: 0.9;
    }
}

.fate__thread-name {
    display: block;
    font-family: var(--font-serif);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    opacity: 0.85;
    white-space: nowrap;
    transition: all 0.4s ease;
}

.fate__thread.active .fate__thread-name {
    opacity: 1;
    color: var(--gold-subtle);
}

.fate__thread-name--zh {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.58rem;
    opacity: 0.6;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.fate__thread.active .fate__thread-name--zh {
    opacity: 0.85;
}

/* 结语 */
.fate__epilogue {
    font-family: var(--font-serif);
    font-size: 0.88rem;
    font-style: italic;
    text-align: center;
    opacity: 0.75;
    line-height: 1.9;
    letter-spacing: 0.02em;
}

.fate__epilogue--zh {
    font-family: var(--font-sans);
    font-size: 0.68rem;
    font-style: normal;
    opacity: 0.8;
    letter-spacing: 0.06em;
}

/* 响应式 */
@media (max-width: 768px) {
    .fate__wheel {
        --wheel-r: clamp(130px, 38vmin, 200px);
        width: calc(var(--wheel-r) * 2 + 80px);
        height: calc(var(--wheel-r) * 2 + 80px);
    }

    .fate__thread-name {
        font-size: 0.6rem;
    }

    .fate__thread-name--zh {
        font-size: 0.5rem;
    }

    .fate__center {
        width: calc(var(--wheel-r) * 1.0);
    }

    .fate__detail-name {
        font-size: 1.1rem;
    }

    .fate__detail-desc {
        font-size: 0.72rem;
    }
}

/* ─── Research Context Section — 深色背景 + 金色 ───────────── */
.nobel {
    padding: var(--section-padding) 0;
    background: var(--ink-black);
    position: relative;
    overflow: hidden;
}

/* Raphael《The School of Athens》— 古典学术权威氛围 */
.nobel__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/school_of_athens.jpg') center center / cover no-repeat;
    opacity: 0.18;
    filter: grayscale(20%) blur(0.5px);
    pointer-events: none;
    z-index: 0;
}

.nobel>*:not(.nobel__atmosphere) {
    position: relative;
    z-index: 1;
}

.nobel::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--paper-white), var(--ink-black));
    pointer-events: none;
}

.nobel .section-header__overtitle {
    color: var(--gold-subtle);
    opacity: 0.6;
}

.nobel__scroll-wrapper {
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 20px 0;
    margin: 0 -24px;
    scrollbar-width: none;
}

.nobel__scroll-wrapper::-webkit-scrollbar {
    display: none;
}

.nobel__track {
    display: flex;
    gap: 20px;
    padding: 0 24px;
    width: max-content;
}

.nobel__card {
    flex: 0 0 320px;
    scroll-snap-align: start;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(201, 168, 76, 0.12);
    border-left: 3px solid var(--gold-subtle);
    padding: clamp(24px, 3vw, 36px);
    transition: all 0.5s ease;
    position: relative;
}

.nobel__card:hover {
    background: rgba(201, 168, 76, 0.04);
    border-color: rgba(201, 168, 76, 0.25);
    transform: translateY(-4px);
}

.nobel__card-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    line-height: 1;
}

.nobel__card-year {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    background: linear-gradient(135deg, #C9A84C, #e6c97a);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 6px;
}

.nobel__card-winners {
    font-size: 0.78rem;
    opacity: 0.5;
    margin-bottom: 16px;
    line-height: 1.6;
}

.nobel__card-field {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--paper-white);
}

.nobel__card-field--zh {
    font-size: 0.75rem;
    opacity: 0.3;
    margin-bottom: 16px;
    letter-spacing: 0.06em;
}

.nobel__card-usage {
    font-size: 0.82rem;
    line-height: 1.8;
    opacity: 0.55;
    margin-bottom: 8px;
}

.nobel__card-usage--zh {
    font-size: 0.75rem;
    line-height: 1.7;
    opacity: 0.3;
}

.nobel__footnote {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-align: center;
    opacity: 0.2;
    letter-spacing: 0.05em;
    margin-top: 48px;
    line-height: 1.8;
}

/* ─── Data Section — 数据洞察 ──────────────────── */
.data {
    padding: var(--section-padding) 0;
    background: transparent;
    color: var(--ink-black);
    position: relative;
    overflow: hidden;
}

/* 纸白底色层 — 最底层 */
.data::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--paper-white);
    z-index: 0;
}

/* Arent de Gelder《Jacob's Dream》— 画作在纸白底之上 */
.data__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/jacobs_dream.jpg') center center / cover no-repeat;
    opacity: 0.25;
    filter: grayscale(15%) sepia(10%);
    pointer-events: none;
    z-index: 1;
}

/* 内容层 — 在画作之上，但背景透明让画作透出 */
.data>*:not(.data__atmosphere) {
    position: relative;
    z-index: 2;
}

/* 文案框 — 半透明朦胧效果，无模糊，让背景画自然透出 */
.data__metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin-top: 48px;
    background: transparent;
    border: 1px solid rgba(10, 10, 10, 0.06);
    border-radius: 4px;
    overflow: hidden;
}

.data__metric {
    padding: clamp(36px, 5vw, 56px) clamp(20px, 3vw, 32px);
    text-align: center;
    position: relative;
    background: rgba(245, 243, 239, 0.2);
}

.data__metric:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background: rgba(10, 10, 10, 0.08);
}

.data__metric-value {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 8px;
}

.data__metric-value--neg {
    color: var(--accent-loss);
}

.data__metric-value--pos {
    color: var(--accent-gain);
}

.data__metric-unit {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.35;
    margin-bottom: 16px;
}

.data__metric-label {
    font-size: 0.82rem;
    line-height: 1.6;
    opacity: 0.55;
}

@media (max-width: 768px) {
    .data__metrics {
        grid-template-columns: 1fr;
    }

    .data__metric:not(:last-child)::after {
        right: 20%;
        top: auto;
        bottom: 0;
        height: 1px;
        width: 60%;
    }
}

/* ─── Pricing Section — 纸白背景 ─────────────────────────── */
.pricing {
    padding: var(--section-padding) 0;
    background: var(--paper-white);
    color: var(--ink-black);
}

.pricing::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--ink-black), var(--paper-white));
    pointer-events: none;
}

.pricing .section-header__overtitle {
    opacity: 0.3;
    color: var(--ink-black);
}

.pricing .section-header__title {
    color: var(--ink-black);
}

.pricing .section-header__title--zh {
    opacity: 0.25;
}

.pricing__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--paper-cream);
    margin-top: 48px;
}

.pricing__card {
    background: var(--paper-white);
    padding: clamp(32px, 4vw, 48px) clamp(24px, 3vw, 36px);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all 0.5s ease;
}

.pricing__card:hover {
    background: var(--paper-pure);
}

.pricing__card-badge {
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    padding: 4px 16px;
    background: var(--ink-black);
    color: var(--paper-white);
}

.pricing__card-tier {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    margin-bottom: 2px;
}

.pricing__card-tier--zh {
    font-size: 0.7rem;
    opacity: 0.3;
    margin-bottom: 20px;
    letter-spacing: 0.1em;
}

.pricing__card-price {
    display: flex;
    align-items: baseline;
    gap: 2px;
    margin-bottom: 20px;
}

.pricing__card-currency {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    opacity: 0.5;
}

.pricing__card-amount {
    font-family: var(--font-mono);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 600;
    letter-spacing: -0.03em;
}

.pricing__card-period {
    font-size: 0.72rem;
    opacity: 0.35;
    margin-left: 6px;
}

.pricing__card-tagline {
    font-size: 0.82rem;
    font-style: italic;
    opacity: 0.7;
    margin-bottom: 4px;
    line-height: 1.6;
}

.pricing__card-tagline--en {
    font-size: 0.72rem;
    opacity: 0.3;
    margin-bottom: 24px;
    line-height: 1.5;
}

.pricing__card-features {
    list-style: none;
    padding: 0;
    margin: 0 0 32px 0;
    flex: 1;
}

.pricing__card-features li {
    font-size: 0.82rem;
    padding: 8px 0;
    border-bottom: 1px solid var(--paper-cream);
    line-height: 1.5;
}

.pricing__card-features--locked {
    opacity: 0.3;
}

.pricing__btn {
    display: block;
    text-align: center;
    padding: 14px 24px;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    border: 1px solid rgba(10, 10, 10, 0.15);
    color: var(--ink-black);
    background: transparent;
    text-decoration: none;
    transition: all 0.4s ease;
}

.pricing__btn:hover {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
}

/* MORTAL — 暗灰调 */
.pricing__card--mortal {
    border-top: 2px solid rgba(10, 10, 10, 0.1);
}

/* SENTINEL — 青蓝霓虹推荐 */
.pricing__card--sentinel {
    border-top: 2px solid var(--ink-black);
}

.pricing__btn--sentinel {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
}

.pricing__btn--sentinel:hover {
    background: transparent;
    color: var(--ink-black);
    box-shadow: 0 0 20px rgba(10, 10, 10, 0.1);
}

/* IMMORTAL — 金色渐变 */
.pricing__card--immortal {
    border-top: 2px solid var(--gold-subtle);
}

.pricing__card--immortal .pricing__card-amount {
    background: linear-gradient(135deg, #C9A84C, #e6c97a);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.pricing__btn--immortal {
    border-color: var(--gold-subtle);
    color: var(--gold-subtle);
}

.pricing__btn--immortal:hover {
    background: var(--gold-subtle);
    color: var(--ink-black);
}

.pricing__footnote {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-align: center;
    opacity: 0.3;
    margin-top: 40px;
    letter-spacing: 0.05em;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .pricing__grid {
        grid-template-columns: 1fr;
    }
}

/* ─── Features Section — 墨色背景 ────────────────────────── */
.features {
    padding: var(--section-padding) 0;
    background: var(--ink-black);
    position: relative;
    overflow: hidden;
}

/* Klimt《Hygieia》— quiet wellness atmosphere */
.features__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/hygieia.jpg') center 20% / cover no-repeat;
    opacity: 0.12;
    filter: grayscale(15%) blur(0.5px);
    pointer-events: none;
    z-index: 0;
}

.features>*:not(.features__atmosphere) {
    position: relative;
    z-index: 1;
}

.features__timeline {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
}

.features__timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.06), transparent);
}

.features__step {
    display: flex;
    gap: clamp(28px, 4vw, 48px);
    margin-bottom: clamp(64px, 8vw, 96px);
    position: relative;
}

.features__step:last-child {
    margin-bottom: 0;
}

.features__step-number {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--paper-white);
    opacity: 0.3;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.features__step-content {
    flex: 1;
    padding-top: 8px;
}

.features__step-icon {
    margin-bottom: 20px;
    opacity: 0.4;
    line-height: 1;
}

.features__step-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 4px;
    letter-spacing: 0.01em;
}

.features__step-title--zh {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    opacity: 0.4;
    margin-bottom: 20px;
    letter-spacing: 0.08em;
}

.features__step-desc {
    font-size: 0.92rem;
    opacity: 0.55;
    line-height: 1.8;
    margin-bottom: 4px;
    font-weight: 400;
}

.features__step-desc--zh {
    font-size: 0.82rem;
    opacity: 0.38;
    margin-bottom: 24px;
}

.features__step-demo {
    margin-top: 24px;
}

.features__demo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.features__demo-label {
    opacity: 0.55;
}

.features__demo-value--pos {
    color: var(--accent-loss);
    font-weight: 500;
    opacity: 0.8;
}

.features__demo-value--neg {
    color: var(--accent-gain);
    font-weight: 500;
    opacity: 0.8;
}

/* Statement demo card */
.features__statement {
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 8px;
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.features__statement-header {
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    opacity: 0.45;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-size: 0.6rem;
}

.features__statement-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    opacity: 0.5;
}

.features__statement-row--total {
    opacity: 0.9;
    font-weight: 600;
    font-size: 0.82rem;
}

.features__statement-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.05);
    margin: 8px 0;
}

/* ─── Data Section — 纸白背景 ────────────────────────────── */
.data {
    padding: var(--section-padding) 0;
    background: var(--paper-white);
    color: var(--ink-black);
}

.data .section-header__overtitle {
    opacity: 0.3;
    color: var(--ink-black);
}

.data .section-header__title {
    color: var(--ink-black);
}

.data .section-header__title--zh {
    opacity: 0.5;
}

.data__metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    background: transparent;
    text-align: center;
    margin-bottom: 56px;
}

.data__metric {
    padding: clamp(36px, 5vw, 64px) 20px;
    background: rgba(245, 243, 239, 0.2);
}

.data__metric-value {
    font-family: var(--font-mono);
    font-size: clamp(2.2rem, 4.5vw, 3.5rem);
    font-weight: 500;
    letter-spacing: -0.03em;
    color: var(--ink-black);
    margin-bottom: 4px;
}

.data__metric-value--neg {
    color: var(--accent-loss);
}

.data__metric-value--pos {
    color: var(--accent-gain);
}

.data__metric-unit {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.35;
    margin-bottom: 16px;
}

.data__metric-label {
    font-size: 0.85rem;
    color: var(--ink-medium);
    line-height: 1.7;
}

/* ─── 医学认知进化时间线 ───────────────────────── */
.data__evolution {
    max-width: 800px;
    margin: 32px auto 64px;
    /* Added 32px top margin to push icons slightly down */
    padding: 0 20px;
}

.data__evo-timeline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    padding-top: 20px;
}

.data__evo-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
    background: transparent;
    /* Removed opaque background */
    padding: 0 16px;
    color: var(--ink-medium);
    opacity: 0.7;
    transition: all 0.6s var(--ease-out-expo);
}

.data__evo-node.revealed {
    opacity: 0.8;
}

.data__evo-node--active.revealed {
    opacity: 1;
    color: var(--ink-black);
}

.data__evo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    transition: transform 0.6s var(--ease-out-expo), color 0.6s ease;
}

.data__evo-node:hover .data__evo-icon {
    transform: translateY(-4px) scale(1.05);
    color: var(--ink-black);
}

.data__evo-node--active .data__evo-icon {
    color: rgba(201, 168, 76, 0.9);
    /* Gold accents for AI */
    filter: drop-shadow(0 0 12px rgba(201, 168, 76, 0.2));
    animation: evoIconBreathe 4s ease-in-out infinite alternate;
    /* New distinct animation to prevent translate issues */
}

@keyframes evoIconBreathe {

    0%,
    100% {
        filter: drop-shadow(0 0 12px rgba(201, 168, 76, 0.2));
        transform: scale(1);
    }

    50% {
        filter: drop-shadow(0 0 20px rgba(201, 168, 76, 0.6));
        transform: scale(1.1);
    }
}

.data__evo-year {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    margin-bottom: 4px;
}

.data__evo-label {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.data__evo-node--active .data__evo-label {
    font-weight: 600;
    background: linear-gradient(135deg, var(--ink-black) 0%, rgba(201, 168, 76, 0.8) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.data__evo-line {
    flex-grow: 1;
    height: 1px;
    background: rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 1;
    margin: 0 -12px;
    top: -16px;
    /* Aligns line to the center of the icons */
}

/* 时间线连线的流光动画 */
.data__evo-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, transparent, rgba(201, 168, 76, 0.4), transparent);
}

/* 当整个时间线reveal时，连线上的流光才开始滑动 */
.data__evolution.revealed .data__evo-line::after {
    animation: flowLine 3s var(--ease-out-expo) forwards;
}

/* 错位延迟流光，创造从左到右依次点亮的感觉 */
.data__evolution.revealed .data__evo-line:nth-of-type(1)::after {
    animation-delay: 0.2s;
}

.data__evolution.revealed .data__evo-line:nth-of-type(2)::after {
    animation-delay: 0.4s;
}

.data__evolution.revealed .data__evo-line:nth-of-type(3)::after {
    animation-delay: 0.6s;
}

.data__evolution.revealed .data__evo-line:nth-of-type(4)::after {
    animation-delay: 0.8s;
}

@keyframes flowLine {
    0% {
        width: 0;
        opacity: 0;
        left: 0;
    }

    30% {
        opacity: 1;
    }

    70% {
        width: 100%;
        left: 0;
        opacity: 1;
    }

    100% {
        width: 100%;
        left: 100%;
        opacity: 0;
    }
}

@media (max-width: 768px) {
    .data__evo-timeline {
        overflow-x: auto;
        padding-bottom: 16px;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch;
    }

    .data__evo-node {
        flex: 0 0 calc(33.333% - 16px);
        min-width: 100px;
    }

    .data__evo-line {
        min-width: 30px;
    }
}

.data__footnote {
    text-align: center;
    font-size: 0.8rem;
    color: var(--ink-light);
    line-height: 1.9;
    max-width: 560px;
    margin: 0 auto;
    opacity: 0.8;
}

/* ─── Vision Section — 墨色背景 + 禅宗弦空间 ────────────── */
.vision {
    padding: var(--section-padding) 0;
    background: var(--ink-black);
}

/* 长谷川等伯《松林图》— 禅宗水墨の極致 */
.vision__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/pine_trees.jpg') center center / cover no-repeat;
    opacity: 0.25;
    filter: grayscale(15%);
    pointer-events: none;
    z-index: 0;
}

.vision__content {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

/* 金色竖向装饰线 — 如古籍中的金箔书签 */
.vision__content::before {
    content: '';
    display: block;
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, transparent, var(--gold-subtle), transparent);
    margin: 0 auto 48px;
    opacity: 0.5;
}

.vision__quote {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.6vw, 1.8rem);
    font-weight: 400;
    font-style: italic;
    line-height: 1.8;
    color: var(--paper-white);
    margin-bottom: 20px;
    letter-spacing: 0.01em;
    border: none;
    padding: 0;
    opacity: 0.9;
}

.vision__quote--zh {
    font-family: var(--font-sans);
    font-size: clamp(0.85rem, 1.4vw, 0.95rem);
    font-style: normal;
    opacity: 0.4;
    line-height: 2;
    margin-bottom: 48px;
}

.vision__text {
    font-size: 0.92rem;
    opacity: 0.5;
    line-height: 1.9;
    margin-bottom: 8px;
    font-weight: 400;
}

.vision__text--zh {
    font-size: 0.85rem;
    opacity: 0.35;
}

/* 背景浮动数据矩阵 — 暗喻量化引擎的底层数据海洋 */
.vision__data-matrix {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
}

.vision {
    position: relative;
    overflow: hidden;
}

.vision .container {
    position: relative;
    z-index: 3;
}

.vision__float-data {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.04);
    letter-spacing: 0.1em;
    white-space: nowrap;
    animation: floatData 12s ease-in-out infinite alternate;
    user-select: none;
}

@keyframes floatData {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 0.03;
    }

    25% {
        opacity: 0.07;
    }

    50% {
        transform: translateY(-15px) translateX(8px);
        opacity: 0.05;
    }

    75% {
        opacity: 0.08;
    }

    100% {
        transform: translateY(-30px) translateX(-5px);
        opacity: 0.03;
    }
}

/* 关键成就指标网格 */
.vision__metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: rgba(255, 255, 255, 0.03);
    margin-top: 72px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.vision__metric {
    padding: clamp(28px, 4vw, 48px) 16px;
    text-align: center;
    background: var(--ink-black);
    transition: background 0.6s ease;
}

.vision__metric:hover {
    background: rgba(255, 255, 255, 0.02);
}

.vision__metric-value {
    font-family: var(--font-mono);
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 500;
    letter-spacing: -0.03em;
    color: var(--paper-white);
    opacity: 0.9;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--paper-white) 0%, rgba(201, 168, 76, 0.6) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.vision__metric-label {
    font-size: 0.72rem;
    line-height: 1.7;
    opacity: 0.35;
    letter-spacing: 0.03em;
}

/* 底部分子结构装饰 */
.vision__molecule {
    text-align: center;
    margin-top: 56px;
    padding-top: 32px;
    color: var(--paper-white);
}

@media (max-width: 768px) {
    .vision__metrics {
        grid-template-columns: repeat(2, 1fr);
    }

    .vision__float-data {
        font-size: 0.5rem;
    }
}

/* ─── Download Section — 纸白，呼吸感 ────────────────────── */
.download {
    padding: var(--section-padding) 0;
    background: var(--paper-white);
    color: var(--ink-black);
    text-align: center;
}

.download__title {
    font-family: var(--font-serif);
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
}

.download__title--zh {
    font-family: var(--font-sans);
    font-weight: 400;
    font-size: 0.38em;
    opacity: 0.45;
    display: block;
    margin-top: 12px;
    letter-spacing: 0.08em;
}

.download__subtitle {
    font-size: 0.95rem;
    color: var(--ink-medium);
    line-height: 2;
    margin-bottom: 48px;
    font-weight: 400;
}

.download__buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Download按钮 — 暗色调 + 霓虹呼吸脉动 */
.download__buttons .btn {
    border-color: rgba(10, 10, 10, 0.2);
    color: var(--ink-black);
    position: relative;
    animation: btnNeonPulse 3s ease-in-out infinite;
}

.download__buttons .btn:hover {
    background: var(--ink-black);
    color: var(--paper-white);
    border-color: var(--ink-black);
    animation: none;
    box-shadow: 0 0 30px rgba(10, 10, 10, 0.2);
}

@keyframes btnNeonPulse {

    0%,
    100% {
        box-shadow: 0 0 0 rgba(201, 168, 76, 0);
    }

    50% {
        box-shadow: 0 0 20px rgba(201, 168, 76, 0.08), 0 0 40px rgba(201, 168, 76, 0.04);
    }
}

/* ─── Footer — 极简，如印章落款 ──────────────────────────── */
.footer {
    padding: 48px 0;
    background: var(--ink-black);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.footer__top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

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

.footer__brand-name {
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.footer__links {
    display: flex;
    gap: 28px;
}

.footer__links a {
    font-size: 0.78rem;
    opacity: 0.35;
    transition: opacity var(--transition-base);
    letter-spacing: 0.03em;
}

.footer__links a:hover {
    opacity: 0.6;
}

/* 品牌哲学签名 — 如古画落款 */
.footer__philosophy {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.footer__philosophy-text {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 0.85rem;
    opacity: 0.2;
    letter-spacing: 0.04em;
    line-height: 1.8;
}

.footer__philosophy-text--zh {
    font-family: var(--font-sans);
    font-style: normal;
    font-size: 0.72rem;
    opacity: 0.13;
    letter-spacing: 0.1em;
    margin-top: 4px;
}

.footer__bottom {
    text-align: center;
    font-size: 0.72rem;
    opacity: 0.25;
    letter-spacing: 0.05em;
}

/* ─── Reveal Animation — 如墨迹渗透 ──────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 1.2s var(--ease-out-expo), transform 1.2s var(--ease-out-expo);
}

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

/* 视差滚动辅助 */
.parallax-element {
    will-change: transform;
}

/* 视差滚动辅助 */
.parallax-element {
    will-change: transform;
}

/* ─── Immortality Section — 人类，离永生还有多远 ─────────── */
.immortality {
    position: relative;
    overflow: hidden;
    background: var(--ink-black);
    padding: var(--section-padding) 0;
    min-height: 100vh;
}

/* Section transition — from light pricing to dark immortality */
.immortality::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--ink-black), var(--ink-black));
    pointer-events: none;
}

.immortality__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/immortality.png') center center / cover no-repeat;
    opacity: 0.25;
    filter: grayscale(30%) blur(1px);
    pointer-events: none;
    z-index: 0;
}

.immortality>*:not(.immortality__atmosphere):not(.immortality__particles) {
    position: relative;
    z-index: 1;
}

.immortality__particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Header */
.immortality__header {
    text-align: center;
    margin-bottom: clamp(56px, 8vw, 96px);
}

.immortality__title {
    font-family: var(--font-serif);
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg,
            var(--paper-white) 0%,
            var(--gold-subtle) 40%,
            var(--paper-white) 70%,
            var(--gold-subtle) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shimmerText 8s linear infinite;
}

.immortality__title--zh {
    font-family: var(--font-sans);
    font-size: clamp(1rem, 2vw, 1.3rem);
    font-weight: 400;
    opacity: 0.4;
    margin-top: 12px;
    letter-spacing: 0.15em;
}

.immortality__narrative {
    font-family: var(--font-serif);
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    line-height: 2;
    opacity: 0.55;
    margin-top: 32px;
    font-style: italic;
}

.immortality__narrative em {
    color: var(--gold-subtle);
    font-style: italic;
    -webkit-text-fill-color: initial;
}

.immortality__narrative--zh {
    font-family: var(--font-sans);
    font-size: clamp(0.8rem, 1.2vw, 0.9rem);
    line-height: 2;
    opacity: 0.3;
    margin-top: 8px;
}

.immortality__narrative--zh em {
    color: var(--gold-subtle);
    font-style: normal;
}

/* ─── Countdown Display ──────────────────────────────────── */
.immortality__countdown {
    text-align: center;
    margin-bottom: clamp(56px, 8vw, 96px);
    padding: clamp(40px, 5vw, 64px);
    border: 1px solid rgba(201, 168, 76, 0.12);
    background: rgba(201, 168, 76, 0.03);
    position: relative;
}

/* Corner decorations — alchemical feel */
.immortality__countdown::before,
.immortality__countdown::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    border-color: var(--gold-subtle);
    border-style: solid;
    opacity: 0.3;
}

.immortality__countdown::before {
    top: -1px;
    left: -1px;
    border-width: 1px 0 0 1px;
}

.immortality__countdown::after {
    bottom: -1px;
    right: -1px;
    border-width: 0 1px 1px 0;
}

.immortality__countdown-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.4;
    margin-bottom: 32px;
}

.immortality__countdown-label--zh {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: none;
    opacity: 0.7;
    margin-top: 6px;
}

.immortality__countdown-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(16px, 3vw, 40px);
}

.immortality__countdown-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.immortality__countdown-number {
    font-family: var(--font-mono);
    font-size: clamp(1.5rem, 4.8vw, 3.6rem);
    font-weight: 700;
    letter-spacing: 0;
    background: linear-gradient(180deg,
            var(--gold-subtle) 0%,
            #e6c97a 40%,
            var(--gold-subtle) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    overflow-wrap: anywhere;
    max-width: 100%;
}

.immortality__countdown-separator {
    font-family: var(--font-mono);
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 300;
    opacity: 0.15;
    margin-top: -16px;
}

.immortality__countdown-text {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    opacity: 0.35;
    line-height: 1.5;
}

.immortality__countdown-source {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    opacity: 0.2;
    margin-top: 28px;
    letter-spacing: 0.05em;
    line-height: 1.8;
}

/* ─── Timeline ───────────────────────────────────────────── */
.immortality__timeline {
    max-width: 700px;
    margin: 0 auto;
    margin-bottom: clamp(56px, 8vw, 96px);
}

.immortality__era {
    display: flex;
    gap: clamp(20px, 3vw, 32px);
    position: relative;
}

.immortality__era-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
    width: 20px;
}

.immortality__era-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    flex-shrink: 0;
    margin-top: 6px;
    transition: all 0.6s var(--ease-out-expo);
}

.immortality__era-dot--active {
    width: 12px;
    height: 12px;
    border-color: var(--gold-subtle);
    background: var(--gold-subtle);
    box-shadow: 0 0 20px rgba(201, 168, 76, 0.4), 0 0 40px rgba(201, 168, 76, 0.15);
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(201, 168, 76, 0.4), 0 0 40px rgba(201, 168, 76, 0.15);
    }

    50% {
        box-shadow: 0 0 30px rgba(201, 168, 76, 0.6), 0 0 60px rgba(201, 168, 76, 0.25);
    }
}

.immortality__era-dot--future {
    width: 12px;
    height: 12px;
    border-color: var(--gold-subtle);
    background: transparent;
    border-style: dashed;
    animation: futurePulse 3s ease-in-out infinite;
}

@keyframes futurePulse {

    0%,
    100% {
        opacity: 0.4;
    }

    50% {
        opacity: 1;
    }
}

.immortality__era-line {
    width: 1px;
    flex-grow: 1;
    min-height: 24px;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03));
}

.immortality__era-content {
    padding-bottom: clamp(28px, 4vw, 44px);
}

.immortality__era-year {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.3;
}

.immortality__era-year--active {
    color: var(--gold-subtle);
    opacity: 1;
    font-weight: 600;
}

.immortality__era-year--future {
    color: var(--gold-subtle);
    opacity: 0.6;
    font-style: italic;
}

.immortality__era-title {
    font-family: var(--font-serif);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 400;
    margin-top: 8px;
    letter-spacing: 0.01em;
}

.immortality__era-title--future {
    background: linear-gradient(135deg, var(--gold-subtle) 0%, #e6c97a 50%, var(--gold-subtle) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.immortality__era-title--zh {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    opacity: 0.3;
    margin-top: 4px;
    letter-spacing: 0.08em;
}

.immortality__era-desc {
    font-size: 0.85rem;
    line-height: 1.9;
    opacity: 0.5;
    margin-top: 8px;
}

.immortality__era-desc em {
    color: var(--gold-subtle);
    font-style: italic;
}

.immortality__era-desc--zh {
    font-size: 0.78rem;
    opacity: 0.65;
    display: inline;
}

/* Active era highlight */
.immortality__era--active .immortality__era-title {
    color: var(--gold-subtle);
}

.immortality__era--active .immortality__era-desc {
    opacity: 0.65;
}

.immortality__era--future .immortality__era-content {
    opacity: 0.7;
}

/* ─── Closing Statement ─────────────────────────────────── */
.immortality__closing {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.immortality__quote {
    font-family: var(--font-serif);
    font-size: clamp(1.3rem, 3vw, 2rem);
    font-weight: 400;
    font-style: italic;
    line-height: 1.6;
    letter-spacing: 0.01em;
    opacity: 0.85;
    border: none;
    padding: 0;
    margin: 0;
}

.immortality__quote--zh {
    font-family: var(--font-sans);
    font-size: clamp(0.85rem, 1.5vw, 1rem);
    opacity: 0.3;
    margin-top: 16px;
    line-height: 2;
    letter-spacing: 0.08em;
}

.immortality__bridge {
    margin-top: clamp(48px, 6vw, 80px);
    padding-top: clamp(40px, 5vw, 64px);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.immortality__bridge-text {
    font-family: var(--font-serif);
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 2;
    opacity: 0.6;
}

.immortality__bridge-text em {
    color: var(--gold-subtle);
    font-style: italic;
}

.immortality__bridge-text--zh {
    font-family: var(--font-sans);
    font-size: clamp(0.8rem, 1.2vw, 0.9rem);
    opacity: 0.3;
    margin-top: 8px;
    letter-spacing: 0.05em;
    line-height: 2;
}

.immortality__bridge-text--zh em {
    color: var(--gold-subtle);
    font-style: normal;
}

.immortality__cta {
    margin-top: 40px;
}

/* ─── Personal Chronicle Section (paper background) ──────────── */
.biography {
    padding: var(--section-padding) 0;
    background: var(--paper-white);
    color: var(--ink-black);
    position: relative;
    overflow: hidden;
}

/* Section过渡带 — 黑→白 */
.biography::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--ink-black), var(--paper-white));
    pointer-events: none;
}

/* Gustave Doré《The Giving of the Law on Mount Sinai》— 圣经天书 */
.biography__atmosphere {
    position: absolute;
    inset: 0;
    background: url('../img/biography_bible.jpg') center 30% / cover no-repeat;
    opacity: 0.22;
    filter: grayscale(30%) sepia(15%) contrast(1.1);
    pointer-events: none;
    z-index: 0;
}

.biography>*:not(.biography__atmosphere) {
    position: relative;
    z-index: 1;
}

.biography .section-header__overtitle {
    opacity: 0.3;
    color: var(--ink-black);
}

.biography .section-header__title {
    color: var(--ink-black);
}

.biography .section-header__title--zh {
    opacity: 0.25;
}

/* ── 简介文字 ── */
.biography__intro {
    font-family: var(--font-serif);
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    line-height: 2;
    text-align: center;
    max-width: 680px;
    margin: 0 auto 8px;
    opacity: 0.65;
    letter-spacing: 0.02em;
}

.biography__intro--zh {
    font-family: var(--font-sans);
    font-size: clamp(0.78rem, 1.1vw, 0.88rem);
    opacity: 0.3;
    margin-bottom: 48px;
    letter-spacing: 0.05em;
}

/* ── 菱形分隔线 ── */
.biography__ornament {
    display: flex;
    justify-content: center;
    margin: clamp(32px, 4vw, 56px) 0;
    color: var(--gold-subtle);
}

/* ── 书本预览卡片组 ── */
.biography__books {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(20px, 3vw, 40px);
    margin: 0 auto;
    max-width: 960px;
    perspective: 1200px;
}

.biography__book-cover {
    position: relative;
    display: flex;
    transition: transform 0.6s var(--ease-out-expo);
    transform-style: preserve-3d;
}

.biography__book:hover .biography__book-cover {
    transform: rotateY(-6deg) translateZ(10px);
}

/* 书脊 */
.biography__book-spine {
    position: absolute;
    left: 0;
    top: 0;
    width: 6px;
    height: 100%;
    background: linear-gradient(135deg, #8B6914 0%, #C9A84C 50%, #8B6914 100%);
    border-radius: 2px 0 0 2px;
    opacity: 0.5;
    transform: rotateY(0deg);
}

/* 书面 */
.biography__book-face {
    width: 100%;
    background: rgba(252, 250, 247, 0.6);
    border: 1px solid rgba(201, 168, 76, 0.12);
    border-left: none;
    padding: clamp(28px, 3vw, 44px) clamp(20px, 2.5vw, 32px);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
}

/* 卡片顶部金色装饰线 */
.biography__book-face::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-subtle), transparent);
    transition: width 0.8s var(--ease-out-expo);
}

.biography__book:hover .biography__book-face::before {
    width: 70%;
}

.biography__book:hover .biography__book-face {
    background: var(--paper-pure);
    box-shadow: 0 8px 40px rgba(139, 105, 20, 0.06);
}

/* 章节编号 */
.biography__book-badge {
    font-family: var(--font-serif);
    font-size: 0.75rem;
    font-style: italic;
    color: var(--gold-subtle);
    opacity: 0.5;
    margin-bottom: 16px;
    letter-spacing: 0.15em;
}

.biography__book-title {
    font-family: var(--font-serif);
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    font-weight: 400;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

.biography__book-title--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.4;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.biography__book-ornament {
    color: var(--gold-subtle);
    font-size: 0.5rem;
    opacity: 0.3;
    margin-bottom: 20px;
}

/* 预览数据区 */
.biography__book-preview {
    margin-bottom: 20px;
}

.biography__preview-line {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 6px 0;
    border-bottom: 1px solid rgba(201, 168, 76, 0.06);
}

.biography__preview-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.35;
}

.biography__preview-value {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.biography__preview-value--neg {
    color: var(--accent-loss);
}

/* 卷首语预览 */
.biography__book-preview--genesis {
    text-align: left;
    margin-bottom: 20px;
}

.biography__genesis-text {
    font-family: var(--font-serif);
    font-size: 0.82rem;
    font-style: italic;
    line-height: 1.8;
    color: var(--ink-medium);
    opacity: 0.7;
}

.biography__genesis-text--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-style: italic;
    line-height: 1.8;
    opacity: 0.35;
    margin-top: 8px;
}

/* 编年体预览 */
.biography__book-preview--chrono {
    text-align: left;
    margin-bottom: 20px;
}

.biography__chrono-event {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 0;
    border-bottom: 1px solid rgba(201, 168, 76, 0.06);
}

.biography__chrono-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ink-wash);
    flex-shrink: 0;
}

.biography__chrono-dot--worst {
    background: var(--accent-loss);
}

.biography__chrono-dot--best {
    background: var(--accent-gain);
}

.biography__chrono-date {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    opacity: 0.4;
    letter-spacing: 0.05em;
    min-width: 32px;
}

.biography__chrono-label {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.6;
}

/* 书本底部描述 */
.biography__book-desc {
    font-size: 0.75rem;
    line-height: 1.8;
    opacity: 0.4;
    letter-spacing: 0.02em;
}

/* ── 功能亮点区 ── */
.biography__features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: rgba(245, 241, 235, 0.3);
    max-width: 960px;
    margin: 0 auto;
}

.biography__feature {
    background: rgba(252, 250, 247, 0.45);
    padding: clamp(28px, 3.5vw, 48px) clamp(20px, 2.5vw, 32px);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
}

.biography__feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-subtle), transparent);
    transition: width 0.8s var(--ease-out-expo);
}

.biography__feature:hover::before {
    width: 60%;
}

.biography__feature:hover {
    background: var(--paper-pure);
}

.biography__feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 24px;
    color: var(--gold-subtle);
    opacity: 0.55;
    transition: opacity 0.5s ease;
}

.biography__feature-icon svg {
    width: 100%;
    height: 100%;
}

.biography__feature:hover .biography__feature-icon {
    opacity: 0.8;
}

.biography__feature-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    margin-bottom: 4px;
}

.biography__feature-title--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.4;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.biography__feature-desc {
    font-size: 0.85rem;
    line-height: 1.85;
    color: var(--ink-medium);
    margin-bottom: 4px;
}

.biography__feature-desc--zh {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    opacity: 0.35;
    margin-bottom: 20px;
    line-height: 1.8;
    letter-spacing: 0.04em;
}

/* 里程碑标签 */
.biography__feature-milestones {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
}

.biography__milestone {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.06em;
    padding: 5px 10px;
    border: 1px solid rgba(201, 168, 76, 0.12);
    border-radius: 2px;
    color: var(--ink-medium);
    transition: all 0.3s ease;
}

.biography__milestone--locked {
    opacity: 0.35;
    border-style: dashed;
    position: relative;
}

.biography__milestone--locked::before {
    content: '🔒 ';
    font-size: 0.55rem;
}

/* 预测曲线 SVG */
.biography__feature-curve {
    margin-top: 16px;
    opacity: 0.4;
    color: var(--gold-subtle);
}

.biography__feature-curve svg {
    width: 100%;
    height: auto;
}

/* 实体书模拟 */
.biography__feature-print {
    margin-top: 16px;
    display: flex;
    justify-content: center;
}

.biography__print-mock {
    position: relative;
    width: 60px;
    height: 80px;
}

.biography__print-page {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 64px;
    border: 1px solid rgba(201, 168, 76, 0.15);
    background: var(--paper-cream);
    border-radius: 1px;
    transition: transform 0.5s var(--ease-out-expo);
}

.biography__print-page:nth-child(1) {
    transform: translateX(-50%) rotate(-3deg);
    z-index: 1;
}

.biography__print-page:nth-child(2) {
    transform: translateX(-50%) rotate(0deg);
    z-index: 2;
}

.biography__print-page:nth-child(3) {
    transform: translateX(-50%) rotate(3deg);
    z-index: 3;
    background: var(--paper-pure);
}

.biography__feature:hover .biography__print-page:nth-child(1) {
    transform: translateX(calc(-50% - 8px)) rotate(-6deg);
}

.biography__feature:hover .biography__print-page:nth-child(3) {
    transform: translateX(calc(-50% + 8px)) rotate(6deg);
}

/* ── 底部引言 ── */
.biography__epilogue {
    text-align: center;
    margin-top: clamp(48px, 6vw, 80px);
    padding-top: clamp(40px, 5vw, 64px);
    border-top: 1px solid var(--paper-cream);
}

.biography__quote {
    font-family: var(--font-serif);
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-style: italic;
    font-weight: 300;
    line-height: 1.9;
    opacity: 0.55;
    max-width: 620px;
    margin: 0 auto 12px;
    letter-spacing: 0.02em;
}

.biography__quote--zh {
    font-family: var(--font-sans);
    font-size: clamp(0.78rem, 1.2vw, 0.88rem);
    opacity: 0.25;
    letter-spacing: 0.08em;
    line-height: 2;
}

/* Pricing section过渡 — biography(白) → pricing(黑) */
.pricing::before {
    content: '';
    display: block;
    height: 120px;
    margin-top: -120px;
    background: linear-gradient(to bottom, var(--paper-white), var(--ink-black));
    pointer-events: none;
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .nav__links {
        display: none;
    }

    .nav__mobile-toggle {
        display: flex;
    }

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

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

    .features__timeline::before {
        display: none;
    }

    .features__step {
        flex-direction: column;
        align-items: flex-start;
    }

    .features__step-number {
        width: 40px;
        height: 40px;
        font-size: 0.85rem;
    }

    .footer__top {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .footer__links {
        flex-wrap: wrap;
        justify-content: center;
    }

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

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

    .ambient-toggle {
        width: 44px;
        height: 44px;
        right: 18px;
        bottom: 18px;
    }

    .immortality__countdown-display {
        flex-direction: column;
        gap: 18px;
    }

    .immortality__countdown-number {
        font-size: 2.5rem;
    }

    .immortality__countdown-separator {
        display: none;
    }

    .immortality__era-marker {
        width: 16px;
    }

    .biography__books {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

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

@media (max-width: 480px) {
    .hero__title {
        font-size: 2.2rem;
    }

    .section-header__title {
        font-size: 1.7rem;
    }

    .immortality__title {
        font-size: 1.8rem;
    }

    .immortality__countdown-number {
        font-size: 2rem;
    }
}