/* ==========================================================================
   墨立方 MoCube — 明亮科技感 · 立方视觉体系
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
    /* 纸白底 + 墨蓝字（墨立方：墨 = ink，立方 = cube） */
    --paper: #FAF8F3;
    --paper-pure: #FFFFFF;
    --ink: #22315C;
    --ink-soft: #46536F;
    --ink-faint: #8A93A8;

    --azure: #1D6FF2;
    --azure-deep: #0F53C4;
    --sky: #EAF2FF;
    --coral: #FF6B4A;
    --coral-tint: #FFEFEA;
    --mint: #18A97C;
    --mint-tint: #E4F7EF;
    --sun: #E89B1C;
    --sun-tint: #FFF4DE;

    --line: #E8E4D8;
    --line-blue: #DCE6F8;

    --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-display: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Menlo', monospace;

    --radius: 20px;
    --shadow-sm: 0 1px 2px rgba(34, 49, 92, .05), 0 4px 14px rgba(34, 49, 92, .05);
    --shadow-lift: 0 18px 44px -12px rgba(34, 49, 92, .18);
    --header-h: 76px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
    font-family: var(--font-body);
    background: var(--paper);
    color: var(--ink-soft);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* 纸张噪点质感 */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    opacity: .5;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.13 0 0 0 0 0.19 0 0 0 0 0.36 0 0 0 .025 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

h1, h2, h3 {
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.25;
    font-weight: 900;
}

a { color: inherit; }
img, svg { display: block; }
::selection { background: rgba(29, 111, 242, .18); }

a:focus-visible, button:focus-visible, summary:focus-visible {
    outline: 3px solid var(--azure);
    outline-offset: 3px;
    border-radius: 6px;
}

.mono {
    font-family: var(--font-mono);
    font-feature-settings: 'tnum';
    letter-spacing: .08em;
}

.container {
    width: min(1180px, 92%);
    margin-inline: auto;
    position: relative;
    z-index: 2;
}

.skip-link {
    position: absolute;
    left: 16px;
    top: -60px;
    z-index: 200;
    background: var(--ink);
    color: #fff;
    padding: 10px 18px;
    border-radius: 10px;
    transition: top .2s;
}
.skip-link:focus { top: 12px; }

/* ---------- 通用组件 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 15px 32px;
    border-radius: 14px;
    font-weight: 700;
    font-size: 16px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform .22s ease, box-shadow .22s ease, background .22s ease, border-color .22s;
}
.btn-sm { padding: 10px 22px; font-size: 15px; border-radius: 11px; }

.btn-primary {
    background: linear-gradient(135deg, var(--azure) 0%, #3E8BFF 100%);
    color: #fff;
    box-shadow: 0 12px 28px -8px rgba(29, 111, 242, .55);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 36px -8px rgba(29, 111, 242, .6);
}

.btn-ghost {
    color: var(--ink);
    border: 1.5px solid rgba(34, 49, 92, .22);
    background: transparent;
}
.btn-ghost:hover {
    border-color: var(--ink);
    background: var(--paper-pure);
    transform: translateY(-2px);
}

.btn-light {
    background: #fff;
    color: var(--azure-deep);
    box-shadow: 0 12px 28px -10px rgba(9, 30, 80, .45);
}
.btn-light:hover { transform: translateY(-2px); }

/* 高亮笔画：标题强调 */
.hl { position: relative; white-space: nowrap; }
.hl::after {
    content: "";
    position: absolute;
    left: -1%;
    right: -1%;
    bottom: .04em;
    height: .34em;
    z-index: -1;
    border-radius: 4px;
    background: linear-gradient(90deg, rgba(29, 111, 242, .22), rgba(255, 107, 74, .25));
    transform: skewX(-8deg);
}

.hl-underline {
    background-image: linear-gradient(transparent 68%, rgba(255, 180, 58, .5) 68%);
}

/* 眉题 */
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--azure-deep);
    margin-bottom: 18px;
}
.eyebrow.light { color: rgba(255, 255, 255, .92); }
.eyebrow .dot {
    width: 5px;
    height: 5px;
    background: var(--coral);
    border-radius: 1.5px;
    transform: rotate(45deg);
}

/* 区块 */
.section { padding: 104px 0; position: relative; }
.section-tint {
    background:
        linear-gradient(180deg, rgba(29, 111, 242, .045), rgba(29, 111, 242, 0) 55%),
        var(--paper-pure);
    border-block: 1px solid var(--line);
}

.section-head { max-width: 720px; margin-bottom: 56px; text-align: center; margin-inline: auto; }
.section-head.left { text-align: left; margin-inline: 0; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); margin-bottom: 16px; }
.section-desc { font-size: 17px; color: var(--ink-soft); }
.section-desc a { color: var(--azure-deep); font-weight: 600; }

/* 滚动入场 */
[data-reveal] {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity .7s ease var(--d, 0s), transform .7s cubic-bezier(.2, .7, .3, 1) var(--d, 0s);
}
[data-reveal].in { opacity: 1; transform: none; }

/* ---------- 顶部导航 ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    display: flex;
    align-items: center;
    background: rgba(250, 248, 243, .82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .3s, box-shadow .3s;
}
.site-header.scrolled {
    border-bottom-color: var(--line);
    box-shadow: 0 8px 30px -18px rgba(34, 49, 92, .25);
}

.header-inner { display: flex; align-items: center; gap: 40px; }

.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 36px; height: 36px; filter: drop-shadow(0 4px 10px rgba(29, 111, 242, .25)); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-cn { font-family: var(--font-display); font-weight: 900; font-size: 20px; color: var(--ink); letter-spacing: .06em; }
.brand-en { font-family: var(--font-mono); font-size: 8.5px; letter-spacing: .22em; color: var(--ink-faint); }

.site-nav { display: flex; gap: 30px; margin-left: auto; }
.site-nav a {
    text-decoration: none;
    font-size: 15.5px;
    font-weight: 500;
    color: var(--ink-soft);
    position: relative;
    padding: 6px 0;
}
.site-nav a::after {
    content: "";
    position: absolute;
    left: 0; right: 100%;
    bottom: 0;
    height: 2.5px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--azure), var(--coral));
    transition: right .28s ease;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { right: 0; }

.header-cta { margin-left: 4px; }

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: 12px;
    cursor: pointer;
    margin-left: auto;
}
.menu-toggle span {
    display: block;
    height: 2px;
    border-radius: 2px;
    background: var(--ink);
    transition: transform .25s, opacity .25s;
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    z-index: 90;
    background: rgba(250, 248, 243, .97);
    backdrop-filter: blur(10px);
    padding: 32px 6%;
}
.mobile-menu nav { display: flex; flex-direction: column; gap: 6px; }
.mobile-menu a {
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 26px;
    color: var(--ink);
    padding: 14px 4px;
    border-bottom: 1px solid var(--line);
}
.mobile-menu .btn { margin-top: 24px; border-bottom: none; justify-content: center; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 72px; position: relative; overflow: hidden; }

.hero-bg { position: absolute; inset: 0; z-index: 0; }

/* 等距网格 */
.hero-bg::before {
    content: "";
    position: absolute;
    inset: -10%;
    background:
        repeating-linear-gradient(90deg, rgba(29, 111, 242, .05) 0 1px, transparent 1px 46px),
        repeating-linear-gradient(30deg, rgba(29, 111, 242, .045) 0 1px, transparent 1px 46px),
        repeating-linear-gradient(150deg, rgba(29, 111, 242, .045) 0 1px, transparent 1px 46px);
    -webkit-mask-image: radial-gradient(ellipse 75% 65% at 60% 38%, #000 30%, transparent 75%);
    mask-image: radial-gradient(ellipse 75% 65% at 60% 38%, #000 30%, transparent 75%);
}

/* 漂移光斑 */
.mesh {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    animation: meshDrift 18s ease-in-out infinite alternate;
}
.mesh-1 { width: 480px; height: 480px; top: -160px; right: -60px; background: rgba(29, 111, 242, .16); }
.mesh-2 { width: 400px; height: 400px; bottom: -180px; left: -120px; background: rgba(255, 107, 74, .13); animation-delay: -6s; }
.mesh-3 { width: 300px; height: 300px; top: 30%; left: 38%; background: rgba(24, 169, 124, .11); animation-delay: -12s; }

@keyframes meshDrift {
    from { transform: translate(0, 0) scale(1); }
    to { transform: translate(40px, -30px) scale(1.12); }
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 48px;
}

.hero h1 {
    font-size: clamp(38px, 5.4vw, 64px);
    letter-spacing: .01em;
    margin-bottom: 24px;
}

.lede { font-size: 18px; max-width: 560px; margin-bottom: 36px; }
.lede strong { color: var(--ink); }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 32px; }

.hero-points {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
}
.hero-points li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--ink-soft);
}
.hero-points li::before {
    content: "";
    width: 14px;
    height: 14px;
    flex: none;
    background:
        linear-gradient(135deg, transparent 50%, var(--sky) 50%);
    border: 1.5px solid var(--azure);
    border-radius: 3.5px;
    transform: rotate(45deg) scale(.85);
}

/* Hero 视觉：3D 立方体（无透视 = 平行投影，等距观感） */
.hero-visual { display: flex; justify-content: center; }

.cube-scene {
    position: relative;
    width: 340px;
    height: 400px;
    --s: 168px;
}

.cube {
    position: absolute;
    width: var(--s);
    height: var(--s);
    transform-style: preserve-3d;
    transform: rotateX(-28deg) rotateY(45deg);
    animation: cubeFloat 7s ease-in-out infinite;
}

.cube-main { left: 86px; top: 96px; }
.cube-mini { --s: 62px; animation-duration: 5.5s; }
.cube-mini.coral { left: 22px; top: 40px; animation-delay: -2.5s; }
.cube-mini.mint { left: 246px; top: 258px; animation-delay: -4.5s; }

@keyframes cubeFloat {
    0%, 100% { transform: rotateX(-28deg) rotateY(45deg) translateZ(0); }
    50% { transform: rotateX(-28deg) rotateY(45deg) translateZ(22px); }
}

.cface { position: absolute; inset: 0; backface-visibility: hidden; }
.cf-top {
    transform: rotateX(90deg) translateZ(calc(var(--s) / 2));
    background: linear-gradient(135deg, #5D9BFF, #2F7BF6);
}
.cf-front {
    transform: translateZ(calc(var(--s) / 2));
    background: linear-gradient(160deg, #1D6FF2 10%, #1250BC 90%);
}
.cf-left {
    transform: rotateY(-90deg) translateZ(calc(var(--s) / 2));
    background: linear-gradient(200deg, #0E429E, #1653C9);
}
.cface::after {
    content: "";
    position: absolute;
    inset: 0;
    border: 1px solid rgba(255, 255, 255, .28);
    background:
        linear-gradient(115deg, rgba(255, 255, 255, .22) 0%, transparent 38%);
}

.cube-mini.coral .cf-top { background: linear-gradient(135deg, #FF9B80, #FF7A5C); }
.cube-mini.coral .cf-front { background: linear-gradient(160deg, #FF6B4A, #E03E1C); }
.cube-mini.coral .cf-left { background: linear-gradient(200deg, #C93414, #E8502C); }
.cube-mini.mint .cf-top { background: linear-gradient(135deg, #4FD3A6, #2BBE90); }
.cube-mini.mint .cf-front { background: linear-gradient(160deg, #18A97C, #0E7E5C); }
.cube-mini.mint .cf-left { background: linear-gradient(200deg, #0B6B4E, #12916B); }

.cube-shadow {
    position: absolute;
    left: 50%;
    bottom: 44px;
    width: 230px;
    height: 54px;
    transform: translateX(-50%);
    background: radial-gradient(ellipse at center, rgba(34, 49, 92, .22), transparent 68%);
    animation: shadowPulse 7s ease-in-out infinite;
}
@keyframes shadowPulse {
    0%, 100% { transform: translateX(-50%) scale(1); opacity: 1; }
    50% { transform: translateX(-50%) scale(.82); opacity: .65; }
}

/* 浮动指标气泡 */
.chip {
    position: absolute;
    padding: 9px 16px;
    background: rgba(255, 255, 255, .9);
    backdrop-filter: blur(6px);
    border: 1px solid var(--line-blue);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ink);
    box-shadow: var(--shadow-sm);
    animation: chipFloat 6s ease-in-out infinite;
    white-space: nowrap;
}
.chip-1 { top: 34px; right: 0; animation-delay: -1s; }
.chip-2 { bottom: 116px; left: -14px; animation-delay: -3s; }
.chip-3 { top: 170px; right: -18px; animation-delay: -5s; }
.chip::before {
    content: "";
    display: inline-block;
    width: 7px;
    height: 7px;
    margin-right: 8px;
    border-radius: 2px;
    transform: rotate(45deg);
    background: var(--mint);
}
.chip-1::before { background: var(--azure); }
.chip-3::before { background: var(--coral); }

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

/* 数据统计 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 84px;
    padding: 34px 40px;
    background: var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}
.stat dt {
    font-size: clamp(30px, 3.4vw, 42px);
    font-weight: 600;
    color: var(--ink);
    line-height: 1.1;
}
.stat dt { color: var(--azure-deep); }
.stat:nth-child(2) dt { color: var(--coral); }
.stat:nth-child(3) dt { color: var(--mint); }
.stat:nth-child(4) dt { color: var(--sun); }
.stat dd { font-size: 14px; color: var(--ink-faint); margin-top: 6px; font-weight: 500; }

/* ---------- 跑马灯 ---------- */
.marquee {
    overflow: hidden;
    border-block: 1px solid var(--line);
    background: var(--paper-pure);
    padding: 18px 0;
    position: relative;
    z-index: 2;
}
.marquee-track {
    display: flex;
    width: max-content;
    animation: marquee 30s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee ul {
    display: flex;
    list-style: none;
    align-items: center;
}
.marquee li {
    display: flex;
    align-items: center;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 17px;
    color: var(--ink);
    white-space: nowrap;
    padding-right: 30px;
}
.marquee li::after {
    content: "";
    width: 8px;
    height: 8px;
    margin-left: 30px;
    background: var(--azure);
    opacity: .35;
    border-radius: 2px;
    transform: rotate(45deg);
}
.marquee li:nth-child(2n)::after { background: var(--coral); }
.marquee li:nth-child(3n)::after { background: var(--mint); }
@keyframes marquee {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* ---------- 服务体系：Bento 网格 ---------- */
.bento {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 22px;
    grid-auto-flow: dense;
}

.bento-card {
    position: relative;
    grid-column: span 7;
    background: var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 34px 32px;
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
    overflow: hidden;
}
.bento-card::before {
    content: "";
    position: absolute;
    top: 0; left: 24px;
    width: 56px; height: 4px;
    border-radius: 0 0 4px 4px;
    background: var(--ac);
    opacity: 0;
    transition: opacity .3s;
}
.bento-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lift);
    border-color: transparent;
}
.bento-card:hover::before { opacity: 1; }

.bento-card:nth-child(4),
.bento-card:nth-child(5) { grid-column: span 6; }

.bento-card.tall {
    grid-column: span 5;
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(120% 70% at 100% 0%, var(--ac-tint) 0%, transparent 55%),
        var(--paper-pure);
}

.card-tag {
    position: absolute;
    top: 22px;
    right: 24px;
    font-size: 10.5px;
    font-weight: 600;
    color: var(--ink-faint);
    letter-spacing: .16em;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 15px;
    display: grid;
    place-items: center;
    background: var(--ac-tint);
    color: var(--ac);
    margin-bottom: 20px;
}
.card-icon svg { width: 26px; height: 26px; }

.bento-card h3 { font-size: 22px; margin-bottom: 12px; }
.bento-card p { font-size: 15.5px; }

.card-list {
    list-style: none;
    margin-top: 22px;
    padding-top: 20px;
    border-top: 1px dashed var(--line);
    display: grid;
    gap: 12px;
}
.card-list li {
    display: flex;
    align-items: baseline;
    gap: 10px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--ink-soft);
}
.card-list li::before {
    content: "";
    flex: none;
    width: 9px;
    height: 9px;
    border-radius: 2px;
    transform: rotate(45deg) translateY(-1px);
    background: var(--ac);
}

/* ---------- 立方方法论 ---------- */
.method-grid {
    display: grid;
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 64px;
    align-items: center;
}

.method-visual { position: relative; display: grid; place-items: center; }
.method-cube { width: min(400px, 100%); height: auto; }
.cube-label {
    fill: #fff;
    font-family: var(--font-body);
    font-size: 21px;
    font-weight: 700;
    text-anchor: middle;
    dominant-baseline: middle;
    letter-spacing: 2px;
}
.method-cube .float-slow { animation: groupFloat 8s ease-in-out infinite; }
@keyframes groupFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
.method-cube .orbit { animation: orbitFloat 5s ease-in-out infinite; }
.method-cube .o2 { animation-delay: -2s; }
.method-cube .o3 { animation-delay: -3.5s; }
@keyframes orbitFloat {
    0%, 100% { transform: translateY(0); opacity: .9; }
    50% { transform: translateY(-16px); opacity: .5; }
}

.method-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: .2em;
    color: var(--ink-faint);
    padding: 8px 14px;
    background: var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: 99px;
}

.axis-list {
    list-style: none;
    display: grid;
    gap: 14px;
    margin-top: 8px;
}
.axis-list li {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    background: var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 22px 24px;
    transition: transform .25s ease, box-shadow .25s ease;
}
.axis-list li:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-sm);
}
.axis-chip {
    flex: none;
    font-size: 12px;
    font-weight: 600;
    color: var(--ac);
    background: var(--ac-tint);
    padding: 6px 12px;
    border-radius: 9px;
    margin-top: 2px;
}
.axis-list h3 { font-size: 19px; margin-bottom: 6px; }
.axis-list p { font-size: 15px; }

/* ---------- 服务流程 ---------- */
.timeline {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 26px;
    counter-reset: step;
    position: relative;
}
.timeline::before {
    content: "";
    position: absolute;
    top: 27px;
    left: 4%;
    right: 4%;
    height: 2px;
    background: repeating-linear-gradient(90deg, var(--line-blue) 0 10px, transparent 10px 18px);
}
.timeline li { position: relative; text-align: left; }
.step-no {
    position: relative;
    z-index: 1;
    display: inline-grid;
    place-items: center;
    width: 54px;
    height: 54px;
    border-radius: 16px;
    background: var(--paper-pure);
    border: 1.5px solid var(--line-blue);
    color: var(--azure-deep);
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 18px;
    box-shadow: var(--shadow-sm);
    transition: transform .25s, border-color .25s, color .25s;
}
.timeline li:hover .step-no {
    transform: translateY(-4px) rotate(-4deg);
    border-color: var(--azure);
}
.timeline h3 { font-size: 19px; margin-bottom: 8px; }
.timeline p { font-size: 14.5px; }

/* ---------- FAQ ---------- */
.faq-grid {
    display: grid;
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    gap: 64px;
    align-items: start;
}

.faq-list { display: grid; gap: 14px; }
.faq-list details {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
    transition: border-color .25s, box-shadow .25s;
}
.faq-list details[open] {
    border-color: var(--line-blue);
    box-shadow: var(--shadow-sm);
    background: var(--paper-pure);
}
.faq-list summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 22px 26px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { font-size: 17.5px; font-weight: 700; line-height: 1.5; }

.faq-icon {
    flex: none;
    position: relative;
    width: 30px;
    height: 30px;
    border-radius: 10px;
    background: var(--sky);
    transition: background .25s;
}
.faq-icon::before, .faq-icon::after {
    content: "";
    position: absolute;
    top: 50%; left: 50%;
    width: 12px; height: 2px;
    border-radius: 2px;
    background: var(--azure-deep);
    transform: translate(-50%, -50%);
    transition: transform .3s;
}
.faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
details[open] .faq-icon { background: var(--azure); }
details[open] .faq-icon::before, details[open] .faq-icon::after {
    background: #fff;
    transform: translate(-50%, -50%) rotate(0deg);
}
details[open] .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg) scaleX(0); }

.faq-body { padding: 0 26px 24px; }
.faq-body p { font-size: 15.5px; color: var(--ink-soft); }

/* ---------- 关于 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 64px;
    align-items: center;
}
.about-text { font-size: 17px; margin-bottom: 36px; }

.facts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}
.facts > div {
    background: var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px 22px;
}
.facts dt { font-size: 12.5px; font-weight: 600; color: var(--ink-faint); margin-bottom: 4px; }
.facts dd { font-weight: 700; color: var(--ink); font-size: 16px; }

.about-quote {
    position: relative;
    background:
        radial-gradient(110% 90% at 100% 0%, var(--sky) 0%, transparent 60%),
        var(--paper-pure);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 56px 44px 44px;
    box-shadow: var(--shadow-sm);
}
.quote-cube { position: absolute; top: -26px; left: 40px; width: 64px; height: 64px; }
.quote-text {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 26px;
    color: var(--ink);
    line-height: 1.55;
}
.quote-src { margin-top: 22px; font-size: 12px; color: var(--ink-faint); }

/* ---------- 联系我们 ---------- */
.contact-section { padding-bottom: 120px; }
.contact-panel {
    position: relative;
    overflow: hidden;
    border-radius: 28px;
    padding: clamp(44px, 6vw, 80px);
    color: #fff;
    background:
        radial-gradient(90% 140% at 85% -20%, rgba(255, 180, 58, .35) 0%, transparent 50%),
        linear-gradient(130deg, #1250BC 0%, var(--azure) 55%, #3E8BFF 100%);
    box-shadow: 0 30px 70px -25px rgba(18, 80, 188, .55);
}
.contact-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(90deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 44px),
        repeating-linear-gradient(30deg, rgba(255, 255, 255, .04) 0 1px, transparent 1px 44px),
        repeating-linear-gradient(150deg, rgba(255, 255, 255, .04) 0 1px, transparent 1px 44px);
    -webkit-mask-image: radial-gradient(80% 100% at 80% 0%, #000, transparent 70%);
    mask-image: radial-gradient(80% 100% at 80% 0%, #000, transparent 70%);
}
.contact-copy { position: relative; max-width: 640px; }
.contact-panel h2 { color: #fff; font-size: clamp(28px, 4vw, 42px); margin-bottom: 16px; }
.contact-desc { font-size: 17px; color: rgba(255, 255, 255, .88); margin-bottom: 34px; }
.contact-desc strong { color: #FFD98A; }
.contact-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.contact-line { margin-top: 30px; font-size: 12.5px; color: rgba(255, 255, 255, .8); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.contact-line .dot { width: 5px; height: 5px; background: #FFD98A; border-radius: 1.5px; transform: rotate(45deg); }

.contact-cube {
    position: absolute;
    right: clamp(24px, 6vw, 88px);
    top: 50%;
    width: clamp(120px, 16vw, 200px);
    height: auto;
    transform: translateY(-50%) rotate(8deg);
    animation: cubeFloatSoft 9s ease-in-out infinite;
}
@keyframes cubeFloatSoft {
    0%, 100% { transform: translateY(-50%) rotate(8deg); }
    50% { transform: translateY(calc(-50% - 16px)) rotate(4deg); }
}

/* ---------- 页脚 ---------- */
.site-footer {
    border-top: 1px solid var(--line);
    background: var(--paper-pure);
    padding-top: 64px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr .8fr .8fr;
    gap: 48px;
    padding-bottom: 48px;
}
.footer-brand p { font-size: 14.5px; color: var(--ink-faint); margin-top: 18px; }
.footer-col h3 { font-size: 12px; color: var(--ink-faint); font-weight: 600; margin-bottom: 16px; }
.footer-col a, .footer-col p {
    display: block;
    text-decoration: none;
    font-size: 15px;
    color: var(--ink-soft);
    padding: 5px 0;
}
.footer-col a:hover { color: var(--azure-deep); }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding-block: 22px;
    border-top: 1px solid var(--line);
    font-size: 13px;
    color: var(--ink-faint);
}
.footer-bottom .mono { font-size: 11.5px; letter-spacing: .06em; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 12px; }
    .hero-visual { order: -1; }
    .cube-scene { width: 300px; height: 340px; --s: 140px; }
    .cube-main { left: 80px; top: 80px; }
    .cube-mini.mint { left: 220px; top: 230px; }
    .method-grid { grid-template-columns: 1fr; gap: 40px; }
    .method-visual { order: -1; }
    .faq-grid { grid-template-columns: 1fr; gap: 36px; }
    .about-grid { grid-template-columns: 1fr; gap: 44px; }
    .timeline { grid-template-columns: repeat(2, 1fr); }
    .timeline::before { display: none; }
    .bento-card, .bento-card.tall { grid-column: span 6; }
    .bento-card.tall { grid-row: span 1; }
}

@media (max-width: 768px) {
    .section { padding: 72px 0; }
    .site-nav, .header-cta { display: none; }
    .menu-toggle { display: flex; }
    .hero { padding-top: 48px; }
    .hero h1 { font-size: clamp(30px, 8.4vw, 44px); }
    .stats { grid-template-columns: repeat(2, 1fr); padding: 26px; gap: 26px 16px; margin-top: 56px; }
    .bento-card, .bento-card.tall,
    .bento-card:nth-child(4), .bento-card:nth-child(5) { grid-column: span 12; padding: 28px 24px; }
    .timeline { grid-template-columns: 1fr; }
    .cube-scene { width: 260px; height: 300px; --s: 118px; }
    .cube-main { left: 70px; top: 70px; }
    .cube-mini { --s: 48px; }
    .cube-mini.mint { left: 190px; top: 200px; }
    .chip-1 { right: -10px; }
    .chip-3 { right: -14px; }
    .contact-cube { display: none; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
    [data-reveal] { opacity: 1; transform: none; }
}