/* ============================================================
   近代物理实验“人工智能+”虚拟教研室
   主题：透明玻璃拟态 (Glassmorphism) · 深空渐变
   ============================================================ */

:root{
    --bg:#05060f;
    --glass:rgba(255,255,255,.055);
    --glass-2:rgba(255,255,255,.085);
    --glass-hi:rgba(255,255,255,.13);
    --stroke:rgba(255,255,255,.12);
    --stroke-hi:rgba(255,255,255,.26);

    --txt:#eef2ff;
    --txt-2:rgba(226,232,240,.76);
    --txt-3:rgba(203,213,225,.58);

    --c1:#5eead4;
    --c2:#818cf8;
    --c3:#c084fc;
    --c4:#38bdf8;

    --grad:linear-gradient(120deg,#5eead4 0%,#818cf8 48%,#c084fc 100%);
    --grad-soft:linear-gradient(135deg,rgba(94,234,212,.18),rgba(129,140,248,.18),rgba(192,132,252,.18));

    --r-xl:32px; --r-lg:24px; --r-md:16px; --r-sm:11px;
    --blur:22px;
    --shadow:0 28px 70px -30px rgba(0,0,0,.85);
    --maxw:1200px;
    --ease:cubic-bezier(.22,.61,.36,1);
}

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

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

body{
    font-family:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",
                -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
    background:var(--bg);
    color:var(--txt);
    line-height:1.75;
    font-size:16px;
    letter-spacing:.01em;
    overflow-x:hidden;
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
}

img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:24px}

/* ============================================================
   背景：光晕 + 网格 + 噪点
   ============================================================ */
.bg{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}

.bg::before{
    content:"";position:absolute;inset:0;
    background:
        radial-gradient(1200px 700px at 12% -8%,rgba(99,102,241,.30),transparent 62%),
        radial-gradient(1000px 620px at 88% 6%,rgba(34,211,238,.20),transparent 60%),
        radial-gradient(900px 700px at 50% 108%,rgba(192,132,252,.22),transparent 62%),
        linear-gradient(180deg,#05060f 0%,#080b1c 45%,#05060f 100%);
}

.orb{
    position:absolute;border-radius:50%;
    filter:blur(90px);opacity:.5;
    will-change:transform;
    animation:float 22s var(--ease) infinite alternate;
}
.orb-1{width:520px;height:520px;top:-140px;left:-120px;background:radial-gradient(circle,rgba(99,102,241,.85),transparent 68%)}
.orb-2{width:460px;height:460px;top:14%;right:-140px;background:radial-gradient(circle,rgba(34,211,238,.7),transparent 68%);animation-delay:-6s}
.orb-3{width:560px;height:560px;bottom:-180px;left:26%;background:radial-gradient(circle,rgba(192,132,252,.68),transparent 68%);animation-delay:-12s}
.orb-4{width:380px;height:380px;top:48%;left:8%;background:radial-gradient(circle,rgba(56,189,248,.55),transparent 68%);animation-delay:-3s}

@keyframes float{
    0%{transform:translate3d(0,0,0) scale(1)}
    50%{transform:translate3d(60px,-40px,0) scale(1.12)}
    100%{transform:translate3d(-40px,50px,0) scale(.95)}
}

.bg-grid{
    position:absolute;inset:0;
    background-image:
        linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
        linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
    background-size:64px 64px;
    mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 20%,transparent 78%);
    -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 20%,transparent 78%);
}

.bg-noise{
    position:absolute;inset:0;opacity:.16;mix-blend-mode:overlay;
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}

/* ============================================================
   玻璃基类
   ============================================================ */
.glass{
    position:relative;
    background:var(--glass);
    border:1px solid var(--stroke);
    border-radius:var(--r-lg);
    backdrop-filter:blur(var(--blur)) saturate(180%);
    -webkit-backdrop-filter:blur(var(--blur)) saturate(180%);
    box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.10);
}

/* 顶部高光描边 */
.glass::before{
    content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
    background:linear-gradient(160deg,rgba(255,255,255,.14),transparent 42%);
    opacity:.7;
}

@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
    .glass{background:rgba(18,22,45,.82)}
}

/* ============================================================
   滚动进度条
   ============================================================ */
.scroll-progress{
    position:fixed;top:0;left:0;height:3px;width:0;z-index:100;
    background:var(--grad);
    box-shadow:0 0 14px rgba(129,140,248,.85);
    transition:width .1s linear;
}

/* ============================================================
   导航
   ============================================================ */
.nav-shell{position:fixed;top:0;left:0;right:0;z-index:90;padding:14px 24px}

.nav{
    max-width:var(--maxw);margin-inline:auto;
    display:flex;align-items:center;gap:20px;
    padding:11px 18px;
    border-radius:999px;
    transition:background .35s var(--ease),box-shadow .35s var(--ease),transform .35s var(--ease);
}
.nav-shell.scrolled .nav{background:rgba(10,13,32,.72);box-shadow:0 20px 50px -24px rgba(0,0,0,.9)}

.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{
    display:grid;place-items:center;
    width:42px;height:42px;border-radius:13px;
    font-size:12px;font-weight:800;letter-spacing:.06em;
    color:#04121a;background:var(--grad);
    box-shadow:0 8px 22px -8px rgba(129,140,248,.95);
}
.brand-text{display:flex;flex-direction:column;line-height:1.24}
.brand-text b{font-size:14.5px;font-weight:700;letter-spacing:.01em}
.brand-text small{font-size:10.5px;color:var(--txt-3);letter-spacing:.09em;text-transform:uppercase}

.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-links a{
    position:relative;display:block;padding:8px 13px;border-radius:999px;
    font-size:14px;color:var(--txt-2);
    transition:color .25s,background .25s;
}
.nav-links a:hover{color:var(--txt);background:var(--glass-2)}
.nav-links a.active{color:var(--txt);background:var(--glass-hi)}
.nav-links a.active::after{
    content:"";position:absolute;left:50%;bottom:3px;translate:-50% 0;
    width:14px;height:2px;border-radius:2px;background:var(--grad);
}

.nav-toggle{display:none;flex-direction:column;gap:5px;padding:9px;border-radius:12px}
.nav-toggle span{display:block;width:20px;height:2px;border-radius:2px;background:var(--txt);transition:transform .3s var(--ease),opacity .2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ============================================================
   Hero
   ============================================================ */
.hero{
    position:relative;min-height:100svh;
    display:flex;flex-direction:column;justify-content:center;align-items:center;
    padding:150px 0 90px;text-align:center;
}
.hero-inner{display:flex;flex-direction:column;align-items:center;gap:26px}

.pill{
    display:inline-flex;align-items:center;gap:9px;
    padding:8px 16px;border-radius:999px;
    font-size:12.5px;color:var(--txt-2);letter-spacing:.03em;
    background:var(--glass);border:1px solid var(--stroke);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.pill .dot{
    width:7px;height:7px;border-radius:50%;background:var(--c1);
    box-shadow:0 0 0 0 rgba(94,234,212,.7);
    animation:pulse 2.4s infinite;
}
@keyframes pulse{
    0%{box-shadow:0 0 0 0 rgba(94,234,212,.6)}
    70%{box-shadow:0 0 0 11px rgba(94,234,212,0)}
    100%{box-shadow:0 0 0 0 rgba(94,234,212,0)}
}

.hero-title{
    font-size:clamp(2.1rem,6.2vw,4.35rem);
    font-weight:800;line-height:1.16;letter-spacing:-.022em;
    text-wrap:balance;
}
.grad-text{
    background:var(--grad);
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;color:transparent;
    filter:drop-shadow(0 8px 30px rgba(129,140,248,.35));
}

.hero-lead{
    max-width:720px;font-size:clamp(1rem,1.6vw,1.13rem);
    color:var(--txt-2);text-wrap:pretty;
}

.hero-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:6px}

.btn{
    display:inline-flex;align-items:center;justify-content:center;
    padding:14px 30px;border-radius:999px;
    font-size:15px;font-weight:600;letter-spacing:.01em;
    transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s,border-color .3s;
}
.btn-primary{
    color:#04121a;background:var(--grad);
    box-shadow:0 16px 40px -16px rgba(129,140,248,.95);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 22px 52px -16px rgba(129,140,248,1)}
.btn-ghost{
    color:var(--txt);background:var(--glass);
    border:1px solid var(--stroke);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.btn-ghost:hover{transform:translateY(-3px);background:var(--glass-hi);border-color:var(--stroke-hi)}

.hero-metrics{
    display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
    gap:14px;width:100%;max-width:900px;margin-top:38px;
}
.metric{
    padding:20px 16px;border-radius:var(--r-md);text-align:center;
    transition:transform .35s var(--ease),background .35s;
}
.metric:hover{transform:translateY(-5px);background:var(--glass-2)}
.metric b{
    display:block;font-size:clamp(1.6rem,3.4vw,2.15rem);font-weight:800;
    line-height:1.1;letter-spacing:-.02em;
    background:var(--grad);-webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
}
.metric span{display:block;margin-top:5px;font-size:12.5px;color:var(--txt-3);line-height:1.5}

.scroll-hint{
    position:absolute;bottom:34px;left:50%;translate:-50% 0;
    width:24px;height:40px;border-radius:14px;
    border:1px solid var(--stroke);background:var(--glass);
    display:grid;place-items:start center;padding-top:8px;
}
.scroll-hint span{
    width:3px;height:8px;border-radius:2px;background:var(--c1);
    animation:wheel 1.9s var(--ease) infinite;
}
@keyframes wheel{
    0%{opacity:0;transform:translateY(0)}
    35%{opacity:1}
    100%{opacity:0;transform:translateY(15px)}
}

/* ============================================================
   区块通用
   ============================================================ */
.section{padding:clamp(72px,10vw,124px) 0;position:relative}

.sec-head{max-width:760px;margin:0 auto clamp(38px,5vw,58px);text-align:center}
.eyebrow{
    display:inline-block;margin-bottom:14px;
    padding:5px 14px;border-radius:999px;
    font-size:11.5px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
    color:var(--c1);background:rgba(94,234,212,.09);
    border:1px solid rgba(94,234,212,.24);
}
.sec-title{
    font-size:clamp(1.65rem,3.6vw,2.5rem);font-weight:800;
    line-height:1.25;letter-spacing:-.018em;text-wrap:balance;
}
.sec-sub{margin-top:15px;font-size:15.5px;color:var(--txt-2);text-wrap:pretty}

.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.span-2{grid-column:span 2}

/* ============================================================
   卡片
   ============================================================ */
.card{
    padding:28px 26px;
    transition:transform .4s var(--ease),background .4s var(--ease),
               border-color .4s var(--ease),box-shadow .4s var(--ease);
}
.card:hover{
    transform:translateY(-6px);
    background:var(--glass-2);
    border-color:var(--stroke-hi);
    box-shadow:0 34px 80px -32px rgba(0,0,0,.9),
               0 0 0 1px rgba(255,255,255,.05),
               inset 0 1px 0 rgba(255,255,255,.16);
}
/* 指针跟随微光 */
.card::after{
    content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
    background:radial-gradient(440px circle at var(--mx,50%) var(--my,0%),
               rgba(129,140,248,.16),rgba(94,234,212,.07) 42%,transparent 64%);
    opacity:0;transition:opacity .45s var(--ease);
}
.card:hover::after{opacity:1}

.card h3{font-size:17px;font-weight:700;letter-spacing:-.01em;margin-bottom:9px}
.card h4{font-size:15px;font-weight:700;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--txt-2)}
.card p a{color:var(--c1);border-bottom:1px solid rgba(94,234,212,.35);transition:border-color .25s}
.card p a:hover{border-color:var(--c1)}

.card-icon{
    display:grid;place-items:center;
    width:48px;height:48px;margin-bottom:16px;
    border-radius:15px;color:#a5b4fc;
    background:var(--grad-soft);
    border:1px solid var(--stroke);
    box-shadow:inset 0 1px 0 rgba(255,255,255,.14);
    transition:color .35s var(--ease),transform .4s var(--ease);
}
.card-icon svg{
    width:23px;height:23px;
    fill:none;stroke:currentColor;
    stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;
}
.card:hover .card-icon{color:var(--c1);transform:translateY(-2px)}
.card-strong{
    display:block;margin:6px 0 10px;
    font-size:15.5px;font-weight:700;letter-spacing:-.01em;
    background:var(--grad);-webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
}

.ticks{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.ticks li{
    position:relative;padding-left:22px;
    font-size:14px;color:var(--txt-2);line-height:1.65;
}
.ticks li::before{
    content:"";position:absolute;left:2px;top:.62em;
    width:7px;height:7px;border-radius:50%;
    background:var(--grad);
    box-shadow:0 0 10px rgba(129,140,248,.75);
}

.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.tag{
    padding:5px 13px;border-radius:999px;
    font-size:12.5px;color:var(--txt-2);
    background:var(--glass-2);border:1px solid var(--stroke);
    transition:color .25s,background .25s,border-color .25s;
}
.tag:hover{color:var(--txt);background:var(--glass-hi);border-color:var(--stroke-hi)}

/* 愿景 */
.vision{text-align:left}
.vision .card-icon{width:52px;height:52px}
.vision .card-icon svg{width:25px;height:25px}

/* ============================================================
   时间线
   ============================================================ */
.timeline{position:relative;display:grid;gap:20px;grid-template-columns:repeat(3,minmax(0,1fr))}
.timeline::before{
    content:"";position:absolute;top:34px;left:8%;right:8%;height:1px;
    background:linear-gradient(90deg,transparent,rgba(129,140,248,.5),rgba(192,132,252,.5),transparent);
}
.tl-item{padding-top:34px}
.tl-dot{
    position:absolute;top:28px;left:26px;
    width:13px;height:13px;border-radius:50%;
    background:var(--grad);
    box-shadow:0 0 0 5px rgba(129,140,248,.16),0 0 18px rgba(129,140,248,.8);
}
.tl-year{
    margin:6px 0 8px;
    font-size:12.5px;font-weight:700;letter-spacing:.1em;
    color:var(--c1);
}

/* ============================================================
   路线图
   ============================================================ */
.roadmap{position:relative}
.rm-item{padding-top:30px;overflow:hidden}
.rm-year{
    position:absolute;top:-14px;right:18px;
    font-size:clamp(3rem,7vw,4.4rem);font-weight:800;line-height:1;
    letter-spacing:-.05em;
    background:linear-gradient(180deg,rgba(129,140,248,.30),rgba(129,140,248,0));
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
    pointer-events:none;user-select:none;
}
.rm-item h3{position:relative;z-index:1}

/* ============================================================
   特色
   ============================================================ */
.feature{padding-top:32px;overflow:hidden}
.feature-no{
    position:absolute;top:20px;right:24px;
    font-size:13px;font-weight:800;letter-spacing:.1em;
    color:transparent;background:var(--grad);
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
    opacity:.9;
}
.feature h3{padding-right:44px}

/* ============================================================
   数据带
   ============================================================ */
.stats-band{padding:0 0 clamp(72px,10vw,124px)}
.stats{
    display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
    gap:8px;padding:38px 26px;text-align:center;
}
.stat b{
    display:block;font-size:clamp(2rem,4.6vw,3rem);font-weight:800;
    line-height:1.06;letter-spacing:-.03em;
    background:var(--grad);-webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
}
.stat span{display:block;margin-top:9px;font-size:13px;color:var(--txt-3);line-height:1.6}
.stat + .stat{border-left:1px solid var(--stroke)}

/* ============================================================
   画廊
   ============================================================ */
.gallery{
    display:grid;gap:16px;
    grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
}
.shot{
    position:relative;overflow:hidden;
    border-radius:var(--r-lg);
    border:1px solid var(--stroke);
    background:var(--glass);
    aspect-ratio:4/3;
    box-shadow:var(--shadow);
    transition:transform .45s var(--ease),border-color .45s var(--ease),box-shadow .45s var(--ease);
}
.shot:nth-child(1),
.shot:nth-child(6){grid-column:span 2;aspect-ratio:8/5}
.shot img{
    width:100%;height:100%;object-fit:cover;
    transition:transform .7s var(--ease),filter .5s var(--ease);
    filter:saturate(.92) brightness(.88);
}
.shot:hover{transform:translateY(-6px);border-color:var(--stroke-hi)}
.shot:hover img{transform:scale(1.07);filter:saturate(1.05) brightness(1)}

.shot figcaption{
    position:absolute;left:12px;right:12px;bottom:12px;
    padding:13px 16px;border-radius:var(--r-md);
    display:flex;flex-direction:column;gap:3px;
    background:rgba(8,11,26,.5);
    border:1px solid rgba(255,255,255,.14);
    backdrop-filter:blur(16px) saturate(180%);
    -webkit-backdrop-filter:blur(16px) saturate(180%);
    transform:translateY(6px);opacity:.94;
    transition:transform .4s var(--ease),opacity .4s var(--ease),background .4s;
}
.shot:hover figcaption{transform:translateY(0);opacity:1;background:rgba(8,11,26,.66)}
.shot figcaption b{font-size:14.5px;font-weight:700;letter-spacing:-.01em}
.shot figcaption span{font-size:12.5px;color:var(--txt-3);line-height:1.5}

/* ============================================================
   团队
   ============================================================ */
.member{text-align:center;padding:30px 22px}
.avatar{
    width:74px;height:74px;margin:0 auto 16px;
    display:grid;place-items:center;border-radius:50%;
    font-size:27px;font-weight:700;color:#04121a;
    background:var(--grad);
    box-shadow:0 14px 34px -14px rgba(129,140,248,.95),
               inset 0 1px 0 rgba(255,255,255,.4);
    transition:transform .45s var(--ease);
}
.member:hover .avatar{transform:scale(1.07) rotate(-4deg)}
.member h3{font-size:16.5px;margin-bottom:3px}
.member .role{
    font-size:12.5px;font-weight:600;letter-spacing:.05em;
    color:var(--c1);margin-bottom:10px;
}
.member .aff{font-size:12.5px;color:var(--txt-3);line-height:1.55}
.member .focus{
    margin-top:13px;padding-top:13px;
    border-top:1px solid var(--stroke);
    font-size:12.5px;color:var(--txt-2);line-height:1.65;
}

/* 团队 5 人：末行居中 */
.team{grid-template-columns:repeat(6,minmax(0,1fr))}
.team .member{grid-column:span 2}
.team .member:nth-child(4){grid-column:2/span 2}
.team .member:nth-child(5){grid-column:4/span 2}

/* ============================================================
   联系
   ============================================================ */
.contact .c-item{text-align:left}
.contact .card-icon{width:44px;height:44px;margin-bottom:13px}
.contact .card-icon svg{width:21px;height:21px}

/* ============================================================
   页脚
   ============================================================ */
.footer{padding:0 0 46px}
.footer-inner{
    display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
    gap:18px;padding:26px 30px;border-radius:var(--r-lg);
}
.footer-brand{display:flex;align-items:center;gap:13px}
.footer-brand b{font-size:14.5px;font-weight:700}
.footer-brand p{font-size:12.5px;color:var(--txt-3);margin-top:2px}
.copy{font-size:12.5px;color:var(--txt-3)}

/* ============================================================
   回到顶部
   ============================================================ */
.to-top{
    position:fixed;right:24px;bottom:24px;z-index:80;
    width:46px;height:46px;border-radius:50%;
    display:grid;place-items:center;font-size:18px;
    background:rgba(10,13,32,.62);color:var(--txt);
    border:1px solid var(--stroke);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    box-shadow:var(--shadow);
    opacity:0;visibility:hidden;transform:translateY(14px);
    transition:opacity .35s var(--ease),transform .35s var(--ease),
               visibility .35s,background .3s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--glass-hi);border-color:var(--stroke-hi)}

/* ============================================================
   滚动揭示
   ============================================================ */
.reveal{opacity:0;transform:translateY(26px)}
.reveal.in{
    opacity:1;transform:none;
    transition:opacity .75s var(--ease),transform .75s var(--ease);
    transition-delay:var(--d,0ms);
}

/* 锚点偏移（避开固定导航） */
section[id]{scroll-margin-top:96px}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
    .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
    .team{grid-template-columns:repeat(4,minmax(0,1fr))}
    .team .member{grid-column:span 2}
    .team .member:nth-child(4){grid-column:1/span 2}
    .team .member:nth-child(5){grid-column:3/span 2}
    .timeline{grid-template-columns:1fr}
    .timeline::before{display:none}
}

@media (max-width:900px){
    .nav{padding:10px 14px}
    .nav-links{
        position:absolute;top:calc(100% + 10px);left:0;right:0;
        flex-direction:column;align-items:stretch;gap:4px;
        padding:12px;border-radius:var(--r-lg);
        background:rgba(9,12,28,.92);
        border:1px solid var(--stroke);
        backdrop-filter:blur(22px) saturate(180%);
        -webkit-backdrop-filter:blur(22px) saturate(180%);
        box-shadow:var(--shadow);
        opacity:0;visibility:hidden;transform:translateY(-10px);
        transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;
    }
    .nav-links.open{opacity:1;visibility:visible;transform:translateY(0)}
    .nav-links a{padding:11px 14px;border-radius:var(--r-sm)}
    .nav-toggle{display:flex;margin-left:auto}
    .nav-shell{padding:12px 16px}

    .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
    .span-2{grid-column:auto}
    .hero-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}
    .stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 8px}
    .stat{border-left:0}
    .stat:nth-child(even){border-left:1px solid var(--stroke)}
    .gallery{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
    .shot:nth-child(1),.shot:nth-child(6){grid-column:auto;aspect-ratio:4/3}
    .team{grid-template-columns:1fr}
    .team .member,
    .team .member:nth-child(4),
    .team .member:nth-child(5){grid-column:auto}
    .footer-inner{flex-direction:column;align-items:flex-start;text-align:left}
}

@media (max-width:560px){
    .container{padding-inline:18px}
    .nav-shell{padding:10px 12px}
    .brand-text small{display:none}
    .card{padding:22px 20px}
    .hero{padding-top:126px}
    .hero-metrics{grid-template-columns:1fr 1fr;gap:10px}
    .metric{padding:16px 12px}
    .gallery{grid-template-columns:1fr}
    .to-top{right:16px;bottom:16px}
}

/* ============================================================
   无障碍 / 降低动效
   ============================================================ */
:focus-visible{
    outline:2px solid var(--c1);outline-offset:3px;border-radius:8px;
}

@media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto}
    *,*::before,*::after{
        animation-duration:.001ms !important;
        animation-iteration-count:1 !important;
        transition-duration:.001ms !important;
    }
    .reveal{opacity:1;transform:none}
}

::selection{background:rgba(129,140,248,.42);color:#fff}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#05060f}
::-webkit-scrollbar-thumb{
    border-radius:10px;
    background:linear-gradient(180deg,rgba(129,140,248,.6),rgba(192,132,252,.6));
    border:2px solid #05060f;
}
::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,rgba(129,140,248,.85),rgba(192,132,252,.85))}