/* ============================================================
   win.江江.com v3 — Apple 风格
   Light minimal · SF-like type · soft glass · airy spacing
   ============================================================ */
:root {
    --bg: #F5F5F7;
    --panel: #FFFFFF;
    --panel-2: #FBFBFD;
    --panel-3: #F0F0F2;
    --line: rgba(0, 0, 0, .08);
    --line-strong: rgba(0, 0, 0, .14);
    --text: #1D1D1F;
    --muted: #6E6E73;
    --accent: #0071E3;
    --accent-2: #0077ED;
    --accent-soft: rgba(0, 113, 227, .08);
    --green: #34C759;
    --amber: #FF9F0A;
    --radius: 18px;
    --shadow: 0 4px 24px rgba(0, 0, 0, .06);
    --shadow-lg: 0 18px 50px rgba(0, 0, 0, .10);
    --ease: cubic-bezier(.22, 1, .36, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    background:
        radial-gradient(900px 600px at 85% -10%, rgba(0, 113, 227, .05), transparent 60%),
        radial-gradient(700px 500px at -10% 110%, rgba(255, 45, 85, .03), transparent 55%),
        var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
        "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
main { overflow-x: hidden; width: 100%; max-width: 100%; flex: 1 0 auto; }
.foot { flex-shrink: 0; }
a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 玻璃导航(苹果白玻璃) ---------- */
.nav-glass {
    position: fixed; top: 14px; left: 50%; transform: translateX(-50%);
    z-index: 100; width: min(1080px, calc(100% - 28px));
    display: flex; align-items: center; justify-content: space-between;
    padding: 9px 20px;
    background: rgba(255, 255, 255, .72);
    border: 1px solid rgba(0, 0, 0, .06);
    border-radius: 999px;
    backdrop-filter: blur(20px) saturate(180%); -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 8px 32px rgba(0, 0, 0, .08);
}
.nav-logo { font-weight: 700; font-size: 16.5px; letter-spacing: -.01em; display: flex; align-items: center; gap: 9px; color: var(--text); }
.nav-logo .dot {
    width: 24px; height: 24px; border-radius: 7px;
    background: linear-gradient(135deg, var(--accent), #42A1FF);
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 12.5px; color: #fff; box-shadow: 0 2px 10px rgba(0, 113, 227, .35);
}
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
    color: var(--muted); font-size: 13.5px; font-weight: 500;
    padding: 7px 13px; border-radius: 999px; transition: all .25s var(--ease);
}
.nav-links a:hover { color: var(--text); background: rgba(0, 0, 0, .05); }
.nav-links .nav-cta {
    color: #fff; background: var(--accent);
    box-shadow: 0 2px 12px rgba(0, 113, 227, .3);
    font-weight: 600;
}
.nav-links .nav-cta:hover { background: #0077ED; }
.nav-burger { display: none; background: none; border: 0; color: var(--text); font-size: 20px; cursor: pointer; }

/* ---------- Hero(Editorial Split,苹果风) ---------- */
.hero {
    position: relative;
    padding: 180px 0 120px;
    min-height: 92vh;
    display: flex; align-items: center;
}
.hero-grid {
    display: grid; grid-template-columns: 1.25fr .9fr;
    gap: 64px; align-items: center; width: 100%;
}
.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 600; letter-spacing: .04em;
    color: var(--accent); margin-bottom: 22px;
}
.hero-eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--accent); border-radius: 2px; }
.hero h1 {
    font-size: clamp(2.9rem, 6.2vw, 5.3rem);
    font-weight: 700; letter-spacing: -.035em;
    line-height: 1.05;
    max-width: 100%;
    color: var(--text);
    margin-bottom: 24px;
}
.hero h1 .grad {
    background: linear-gradient(110deg, #1D1D1F 20%, var(--accent) 90%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-sub {
    color: var(--muted); font-size: 17.5px; max-width: 460px;
    margin-bottom: 36px;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 28px; border-radius: 980px;
    font-size: 15.5px; font-weight: 600;
    transition: transform .3s var(--ease), box-shadow .3s var(--ease), background .3s;
    border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 20px rgba(0, 113, 227, .3); }
.btn-primary:hover { background: #0077ED; box-shadow: 0 10px 28px rgba(0, 113, 227, .4); }
.btn-ghost { background: rgba(0, 0, 0, .05); color: var(--text); }
.btn-ghost:hover { background: rgba(0, 0, 0, .09); }
.btn .arr { transition: transform .3s var(--ease); }
.btn:hover .arr { transform: translateX(4px); }

/* Hero 右侧视觉卡片 */
.hero-visual { position: relative; height: 430px; perspective: 1100px; }
.hv-card {
    position: absolute; width: 248px;
    background: rgba(255, 255, 255, .85);
    border: 1px solid rgba(0, 0, 0, .06);
    border-radius: 22px;
    padding: 22px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    will-change: transform;
}
.hv-card:hover { box-shadow: 0 34px 80px rgba(0, 0, 0, .18); }
.hv-card .hv-tag {
    font-size: 11.5px; font-weight: 600; letter-spacing: .04em;
    color: var(--accent); margin-bottom: 10px; display: block;
}
.hv-card .hv-name { font-size: 16.5px; font-weight: 700; letter-spacing: -.01em; line-height: 1.3; margin-bottom: 5px; color: var(--text); }
.hv-card .hv-meta { font-size: 12.5px; color: var(--muted); }
.hv-card .hv-go {
    margin-top: 14px; display: inline-block;
    font-size: 13px; font-weight: 600; color: #fff;
    background: var(--accent); padding: 6px 16px; border-radius: 980px;
}
.hv-1 { top: 4%; right: 14%; transform: rotate(2deg); z-index: 2; }
.hv-2 { bottom: 2%; right: 38%; transform: rotate(-2.5deg); z-index: 3; }
.hv-3 {
    top: 26%; right: -2%; width: 220px; height: 220px; z-index: 1;
    border-radius: 50%;
    background: conic-gradient(from 180deg, rgba(0, 113, 227, .14), rgba(255, 45, 85, .07), rgba(255, 159, 10, .09), rgba(0, 113, 227, .14));
    filter: blur(1px);
    animation: hvpulse 7s ease-in-out infinite;
}
@keyframes hvpulse { 0%, 100% { opacity: .7; } 50% { opacity: 1; } }

/* ---------- Scrubbing 文案 ---------- */
.scrub-section { padding: 140px 0; text-align: center; }
.scrub-title {
    font-size: clamp(1.9rem, 4vw, 3.2rem);
    font-weight: 700; letter-spacing: -.02em; line-height: 1.3;
    max-width: 880px; margin: 0 auto;
    color: var(--text);
}
.scrub-title .word {
    display: inline-block; opacity: .14;
    transition: opacity .2s linear;
}
.scrub-title .word.hot { color: var(--accent); }

/* ---------- Bento 四步 ---------- */
.bento-section { padding: 60px 0 140px; }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 44px; gap: 24px; }
.sec-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.7rem); font-weight: 700; letter-spacing: -.02em; line-height: 1.15; }
.sec-head p { color: var(--muted); max-width: 340px; font-size: 14.5px; }
.bento {
    display: grid; grid-template-columns: repeat(12, 1fr);
    grid-auto-flow: dense; gap: 14px;
}
.bento-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 28px;
    position: relative; overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .45s var(--ease), box-shadow .45s;
}
.bento-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.bento-card .b-num {
    font-size: 54px; font-weight: 700; letter-spacing: -.04em;
    background: linear-gradient(150deg, var(--accent), rgba(0, 113, 227, .3));
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 18px;
    font-variant-numeric: tabular-nums;
}
.bento-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; letter-spacing: -.01em; }
.bento-card p { color: var(--muted); font-size: 14px; }
.bento-card .b-link {
    display: inline-block; margin-top: 18px;
    font-size: 14px; font-weight: 600; color: var(--accent);
}
.bento-card .b-link:hover { text-decoration: underline; }
.b-1 { grid-column: span 7; }
.b-2 { grid-column: span 5; }
.b-3 { grid-column: span 5; }
.b-4 { grid-column: span 7; }
.b-4 .b-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.b-4 .b-tools span {
    font-size: 12.5px; color: var(--text);
    background: var(--accent-soft); border: 1px solid rgba(0, 113, 227, .16);
    padding: 5px 12px; border-radius: 980px;
}

/* ---------- Marquee ---------- */
.marquee-section { padding: 36px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; background: rgba(255, 255, 255, .35); }
.marquee { display: flex; gap: 56px; width: max-content; animation: marquee 30s linear infinite; }
.marquee:hover { animation-play-state: paused; }
.marquee span {
    font-size: 14.5px; font-weight: 500; color: var(--muted);
    white-space: nowrap; letter-spacing: .01em;
}
.marquee span b { color: var(--text); font-weight: 600; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 卡片堆叠(系统镜像) ---------- */
.stack-section { padding: 140px 0; }
.stack-inner { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: start; }
.stack-copy h2 { font-size: clamp(1.8rem, 3.6vw, 2.9rem); font-weight: 700; letter-spacing: -.02em; line-height: 1.15; margin-bottom: 20px; }
.stack-copy p { color: var(--muted); font-size: 15.5px; max-width: 380px; }
.stack-copy .btn { margin-top: 30px; }
.stack-stage { position: relative; height: 520px; }
.stack-card {
    position: absolute; left: 0; right: 0;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 22px; padding: 30px 28px;
    box-shadow: var(--shadow-lg);
    will-change: transform;
}
.stack-card .sc-os {
    display: inline-block; font-size: 12px; font-weight: 600;
    letter-spacing: .03em; padding: 4px 12px; border-radius: 980px;
    margin-bottom: 16px;
}
.sc-os.w11 { background: rgba(0, 113, 227, .1); color: var(--accent); }
.sc-os.w10 { background: rgba(52, 199, 89, .12); color: #248A3D; }
.sc-os.w7 { background: rgba(255, 159, 10, .14); color: #C93400; }
.stack-card h3 { font-size: 22px; font-weight: 700; letter-spacing: -.02em; margin-bottom: 8px; }
.stack-card p { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.stack-card .sc-go {
    display: inline-block; color: #fff; background: var(--accent);
    padding: 9px 20px; border-radius: 980px; font-size: 14px; font-weight: 600;
}
.stack-card .sc-note { margin-top: 14px; font-size: 12.5px; color: var(--muted); }

/* ---------- 装机三件套 ---------- */
.acc-section { padding: 30px 0 120px; }
.acc-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; height: 330px; }
.acc-panel {
    position: relative; overflow: hidden;
    border-radius: var(--radius); border: 1px solid var(--line);
    background: linear-gradient(165deg, #FFFFFF 0%, #F4F8FF 100%);
    box-shadow: var(--shadow);
    transition: box-shadow .4s, transform .4s var(--ease);
    display: flex; align-items: flex-end;
}
.acc-panel::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(380px 240px at 85% 0%, rgba(0, 113, 227, .1), transparent 70%);
    pointer-events: none;
}
.acc-panel:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.acc-num {
    position: absolute; top: -16px; right: 10px;
    font-size: 128px; font-weight: 900; line-height: 1;
    letter-spacing: -.05em;
    background: linear-gradient(180deg, rgba(0, 113, 227, .18), rgba(0, 113, 227, .02));
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
    pointer-events: none; user-select: none;
    transition: transform .4s var(--ease);
}
.acc-panel:hover .acc-num { transform: translateY(-5px) scale(1.05); }
.acc-panel .acc-inner { padding: 24px 26px 26px; width: 100%; position: relative; }
.acc-panel .acc-kicker {
    font-size: 12px; font-weight: 700; letter-spacing: .08em;
    color: var(--accent); margin-bottom: 10px; display: block;
}
.acc-panel h3 { font-size: 21px; font-weight: 700; letter-spacing: -.01em; margin-bottom: 8px; }
.acc-panel p { color: var(--muted); font-size: 13.5px; max-width: 280px; }
.acc-panel .acc-go { display: inline-block; margin-top: 16px; font-weight: 600; color: var(--accent); font-size: 14px; }
.acc-panel:hover .acc-go { text-decoration: underline; }

/* ---------- 最终 CTA ---------- */
.final-cta { padding: 120px 0; text-align: center; position: relative; }
.final-cta::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(600px 300px at 50% 50%, rgba(0, 113, 227, .07), transparent 70%);
    pointer-events: none;
}
.final-cta h2 {
    font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 700;
    letter-spacing: -.03em; line-height: 1.1; margin-bottom: 18px;
}
.final-cta p { color: var(--muted); margin-bottom: 38px; font-size: 16px; }
.final-cta .btn { font-size: 17px; padding: 17px 38px; }

/* ---------- 页脚(紧凑单条式) ---------- */
.foot {
    background: linear-gradient(180deg, #0D1829 0%, #0A1220 100%);
    color: var(--muted); font-size: 13px;
}
.foot .wrap { padding-top: 30px; padding-bottom: 24px; }
.foot-main {
    display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
    padding-bottom: 18px;
}
.foot-brand { display: flex; align-items: center; gap: 13px; flex-wrap: wrap; }
.foot-brand .foot-logo {
    display: flex; align-items: center; gap: 8px;
    font-size: 16px; font-weight: 800; color: #fff;
    letter-spacing: -.01em;
}
.foot-brand .foot-logo .dot {
    width: 26px; height: 26px; border-radius: 8px;
    background: linear-gradient(135deg, #5B8DEF, #0071E3);
    color: #fff; font-size: 13px; font-weight: 800;
    display: inline-flex; align-items: center; justify-content: center;
}
.foot-brand p { font-size: 12.5px; color: #7C8FA8; margin: 0; }
.foot-qq { display: flex; gap: 9px; flex-wrap: wrap; }
.foot-qq a {
    font-size: 12px; color: #B7C1D4; white-space: nowrap;
    border: 1px solid rgba(255, 255, 255, .14); border-radius: 980px;
    padding: 6px 14px; transition: all .25s;
}
.foot-qq a:hover { color: #fff; border-color: rgba(255, 255, 255, .35); background: rgba(255, 255, 255, .06); }
.foot-bottom {
    display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap;
    border-top: 1px solid rgba(255, 255, 255, .07);
    padding: 13px 0 0;
    font-size: 12px; color: #52647E;
}
@media (max-width: 640px) {
    .foot-main { flex-direction: column; align-items: flex-start; gap: 14px; }
    .foot-bottom { flex-direction: column; align-items: flex-start; gap: 4px; }
}

/* ============================================================
   列表页(pe / system)
   ============================================================ */
.page-hero { padding: 160px 0 40px; }
.page-hero .back {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--muted); font-size: 14px; margin-bottom: 26px;
    transition: color .25s;
}
.page-hero .back:hover { color: var(--accent); }
.page-hero h1 {
    font-size: clamp(2.3rem, 5vw, 3.9rem); font-weight: 700;
    letter-spacing: -.03em; line-height: 1.08; margin-bottom: 16px;
    max-width: 100%;
}
.page-hero .sub { color: var(--muted); font-size: 16px; max-width: 560px; }

.block { margin: 34px 0 70px; scroll-margin-top: 110px; }
.block-title {
    display: flex; align-items: center; gap: 12px;
    font-size: 19px; font-weight: 700; margin-bottom: 22px;
    letter-spacing: -.01em;
}
.block-title::before {
    content: ""; width: 5px; height: 20px; border-radius: 3px;
    background: linear-gradient(180deg, var(--accent-2), var(--accent));
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.loading { color: var(--muted); grid-column: 1 / -1; padding: 30px; text-align: center; }

.item {
    background: var(--panel);
    border: 1px solid var(--line); border-radius: var(--radius);
    padding: 22px; display: block; position: relative; overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .4s var(--ease), box-shadow .4s;
}
.item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}
.cat-tag {
    display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: .03em;
    color: var(--accent); background: var(--accent-soft);
    border-radius: 980px; padding: 3px 11px; margin-bottom: 12px;
}
.item-name { font-weight: 700; font-size: 15px; word-break: break-all; line-height: 1.45; color: var(--text); }
.item-desc { color: var(--muted); font-size: 12.5px; margin: 6px 0 14px; }
.item-go { color: var(--accent); font-size: 13.5px; font-weight: 600; }
.item .dl {
    display: inline-block;
    background: var(--accent); color: #fff;
    border-radius: 980px; padding: 8px 20px; font-size: 13.5px; font-weight: 600;
    box-shadow: 0 2px 12px rgba(0, 113, 227, .28);
    transition: background .25s, transform .25s var(--ease);
}
.item .dl:hover { background: #0077ED; transform: translateY(-1px); }
.item.big { padding: 28px; }

.tip { color: var(--muted); font-size: 13.5px; margin-top: 16px; }
.page-foot { border-top: 1px solid var(--line); margin-top: 60px; }

/* 系统版本分区(每版本一卡,网格排布) */
.src-tabs {
    position: relative;
    display: inline-flex; flex-wrap: wrap; align-items: center;
    background: rgba(0, 0, 0, .06);
    border-radius: 980px; padding: 3px;
    margin-bottom: 26px; gap: 2px;
}
.src-thumb {
    position: absolute; top: 3px; left: 0;
    width: 0; height: 34px;
    background: #fff; border-radius: 980px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, .1);
    transition: transform .38s cubic-bezier(.34, 1.25, .4, 1), width .38s cubic-bezier(.34, 1.25, .4, 1);
    will-change: transform, width;
    z-index: 0; pointer-events: none;
}
.src-tab {
    border: 0; background: transparent; color: var(--muted);
    position: relative; z-index: 1;
    height: 34px; padding: 0 13px; border-radius: 980px;
    font-size: 13px; font-weight: 600; font-family: inherit;
    cursor: pointer; transition: color .25s;
    white-space: nowrap; line-height: 34px;
}
.src-tab:hover:not(.active) { color: var(--text); }
.src-tab.active {
    background: transparent; color: var(--text);
    box-shadow: none;
}
@media (max-width: 480px) {
    .src-tab { padding: 0 8px; font-size: 12px; }
}
#official-list .item { height: 100%; }
#system-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 14px; }
#wenqi-list, #atlasos-list, #revios-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 14px; }
#system-list .loading { grid-column: 1 / -1; }
.ver-card {
    background: var(--panel);
    border: 1px solid var(--line); border-radius: var(--radius);
    padding: 20px 20px 10px;
    box-shadow: var(--shadow);
    transition: transform .35s var(--ease), box-shadow .35s;
    display: flex; flex-direction: column;
}
.ver-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.ver-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.ver-name { font-size: 16.5px; font-weight: 700; letter-spacing: -.01em; }
.badge-rcmd {
    font-size: 11px; font-weight: 700; color: #fff;
    background: linear-gradient(135deg, #0071E3, #42A1FF);
    padding: 2px 11px; border-radius: 980px;
    box-shadow: 0 2px 8px rgba(0, 113, 227, .3);
}
.ver-file {
    display: flex; justify-content: space-between; align-items: center; gap: 10px;
    padding: 10px 0;
    border-top: 1px solid var(--line);
    font-size: 12.5px; color: var(--muted);
    transition: color .2s;
}
.ver-file:first-of-type { border-top: 0; }
.ver-file:hover { color: var(--text); }
.ver-fname { line-height: 1.45; word-break: break-all; }
.ver-go {
    flex-shrink: 0; color: #fff; background: var(--accent);
    font-size: 12px; font-weight: 600; padding: 5px 13px; border-radius: 980px;
    transition: background .2s;
}
.ver-file:hover .ver-go { background: #0077ED; }

/* ============================================================
   页面过渡 + 骨架屏
   ============================================================ */
/* 浏览器原生 View Transitions(Chrome 126+/Edge):跨页面丝滑切换 */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: vt-slide-out .32s var(--ease) both; }
::view-transition-new(root) { animation: vt-slide-in .32s var(--ease) both; }
@keyframes vt-slide-out { to { opacity: 0; transform: translateY(12px); } }
@keyframes vt-slide-in { from { opacity: 0; transform: translateY(12px); } }

/* 旧浏览器 JS 过渡兜底 */
body { transition: opacity .3s var(--ease), transform .3s var(--ease); }
body.page-leave { opacity: 0; transform: translateY(10px); }
body.page-enter { opacity: 0; transform: translateY(10px); }
body.page-enter.ready { opacity: 1; transform: none; }

.skeleton-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 14px; width: 100%; }
.skeleton-card {
    background: var(--panel);
    border: 1px solid var(--line); border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
}
.sk-line {
    height: 13px; border-radius: 7px;
    background: linear-gradient(90deg, #ECECF0 25%, #F8F8FA 45%, #ECECF0 65%);
    background-size: 240% 100%;
    animation: sk-shimmer 2s ease-in-out infinite;
    margin-bottom: 12px;
}
.sk-line:last-child { margin-bottom: 0; }
.sk-w30 { width: 30%; } .sk-w40 { width: 40%; } .sk-w60 { width: 60%; } .sk-w80 { width: 80%; }
.sk-chip {
    height: 20px; width: 70px; border-radius: 980px;
    background: linear-gradient(90deg, #ECECF0 25%, #F8F8FA 45%, #ECECF0 65%);
    background-size: 240% 100%;
    animation: sk-shimmer 2s ease-in-out infinite;
    margin-bottom: 14px;
}
@keyframes sk-shimmer { 0% { background-position: 100% 0; } 100% { background-position: -140% 0; } }
@media (prefers-reduced-motion: reduce) {
    .sk-line, .sk-chip { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
    .hero { padding: 150px 0 90px; min-height: auto; }
    .hero-grid { grid-template-columns: 1fr; gap: 60px; }
    .hero-visual { height: 360px; }
    .hv-2 { right: 20%; }
    .stack-inner { grid-template-columns: 1fr; }
    .stack-stage { height: 460px; }
    .acc-row { grid-template-columns: 1fr; height: auto; }
    .acc-panel { min-height: 150px; }
    .b-1, .b-2, .b-3, .b-4 { grid-column: span 12; }
    .foot-grid { grid-template-columns: 1fr; gap: 30px; }
    .foot .wrap { padding-top: 48px; }
}
@media (max-width: 640px) {
    body { font-size: 15px; }
    .wrap { padding: 0 16px; }
    .nav-links { display: none; }
    .nav-burger { display: block; }
    .hero h1 { font-size: clamp(2.2rem, 9.5vw, 3rem); }
    .hero-visual { height: 300px; }
    .hv-card { width: 210px; padding: 18px; }
    .sec-head { flex-direction: column; align-items: flex-start; }
    .bento-card { padding: 24px 20px; }
    .foot { flex-direction: column; text-align: center; }
}