/* ===== XHCGroup — 深色融合 · xmzf 极简 + rtstu 青绿玻璃 + fanggame 光标光晕 ===== */
:root{
  --bg:#050506;
  --bg2:#0b0c0e;
  --bg3:#111316;
  --panel:rgba(255,255,255,.045);     /* 玻璃面板 */
  --panel-solid:#0e0f12;
  --ink:#f4f3f0;                       /* 米白 */
  --ink-2:#cdcdc8;
  --muted:#8b8b86;
  --line:rgba(255,255,255,.10);
  --soft:rgba(255,255,255,.05);
  --accent:#5eead4;                    /* 青绿 */
  --accent2:#22d3ee;                  /* 青 */
  --accent3:#7aa7ff;                  /* 蓝 */
  --accent-grad:linear-gradient(120deg,#5eead4,#22d3ee 52%,#7aa7ff);
  --accent-soft:rgba(94,234,212,.12);
  --accent-soft2:rgba(34,211,238,.12);
  --accent-line:rgba(94,234,212,.30);
  --radius:18px;
  --radius-lg:24px;
  --radius-pill:999px;
  --maxw:980px;
  --maxw-wide:1120px;
  --shadow:0 10px 40px rgba(0,0,0,.5);
  --shadow-lg:0 22px 64px rgba(0,0,0,.62),0 0 0 1px rgba(94,234,212,.14);
  --font:"DM Sans","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"JetBrains Mono","SF Mono",ui-monospace,Consolas,monospace;
  --t:.3s cubic-bezier(.4,0,.2,1);
  --glow:radial-gradient(340px circle at var(--mx,50%) var(--my,50%),rgba(94,234,212,.10),transparent 65%);
}
/* 浅色对照（可切换，默认深色） */
[data-theme="light"]{
  --bg:#f6f9fb;
  --bg2:#eef3f7;
  --bg3:#e6edf3;
  --panel:rgba(255,255,255,.7);
  --panel-solid:#ffffff;
  --ink:#0c0d10;
  --ink-2:#3a3d44;
  --muted:#6a6e76;
  --line:rgba(10,20,40,.10);
  --soft:rgba(10,30,60,.04);
  --accent:#0d9488;
  --accent2:#0891b2;
  --accent3:#2563eb;
  --accent-grad:linear-gradient(120deg,#0d9488,#0891b2 52%,#2563eb);
  --accent-soft:rgba(13,148,136,.12);
  --accent-soft2:rgba(8,145,178,.12);
  --shadow:0 10px 40px rgba(20,40,80,.12);
  --shadow-lg:0 22px 60px rgba(20,40,80,.18),0 0 0 1px rgba(13,148,136,.16);
  --glow:radial-gradient(340px circle at var(--mx,50%) var(--my,50%),rgba(13,148,136,.10),transparent 65%);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);color:var(--ink);line-height:1.55;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  letter-spacing:.005em;position:relative;overflow-x:hidden;
  transition:background-color var(--t),color var(--t);
}
/* 顶部柔光 + 极淡网格 */
body::before{content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.9;
  background:
    radial-gradient(50% 36% at 18% -4%,rgba(94,234,212,.10),transparent 70%),
    radial-gradient(46% 34% at 88% 0%,rgba(122,167,255,.10),transparent 70%),
    linear-gradient(160deg,rgba(255,255,255,.04),rgba(255,255,255,.01) 42%,transparent 70%),
    linear-gradient(115deg,transparent 35%,rgba(255,255,255,.022) 50%,transparent 65%)}
body::after{content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--soft) 1px,transparent 1px),linear-gradient(90deg,var(--soft) 1px,transparent 1px);
  background-size:54px 54px;
  -webkit-mask-image:radial-gradient(120% 80% at 50% 0%,#000,transparent 78%);
  mask-image:radial-gradient(120% 80% at 50% 0%,#000,transparent 78%)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(var(--maxw),90%);margin:0 auto}
.container-wide{width:min(var(--maxw-wide),92%);margin:0 auto}
.muted{color:var(--muted)}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:100;border-radius:0 0 8px 0}
.skip:focus{left:12px;top:12px}

/* 光标跟随光晕 */
.cursor-glow{position:fixed;inset:0;z-index:-1;pointer-events:none;background:var(--glow);opacity:0;transition:opacity .4s ease}
@media(prefers-reduced-motion:reduce){.cursor-glow{display:none}}

/* 顶部进度条 */
.progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:60;background:var(--accent-grad);transition:width .1s linear}

/* 导航：玻璃 */
.nav{position:sticky;top:0;z-index:40;background:rgba(8,9,11,.6);
  backdrop-filter:saturate(1.5) blur(22px);-webkit-backdrop-filter:saturate(1.5) blur(22px);
  border-bottom:1px solid var(--line);transition:border-color .25s,background-color var(--t)}
[data-theme="light"] .nav{background:rgba(255,255,255,.66)}
/* 导航滚动收成悬浮胶囊（保持容器宽度，避免多链接挤压重叠） */
.nav.scrolled,.pnav.scrolled{background:transparent;border-color:transparent}
.nav-in,.pnav-in{transition:border-radius .4s,border-color .3s,background-color var(--t),box-shadow .4s,margin .4s,padding .4s}
.nav.scrolled .nav-in,.pnav.scrolled .pnav-in{margin:10px auto 0;padding:0 14px;border-radius:var(--radius-pill);background:rgba(8,9,11,.82);backdrop-filter:saturate(1.5) blur(18px);-webkit-backdrop-filter:saturate(1.5) blur(18px);border:1px solid var(--line);box-shadow:var(--shadow-lg)}
[data-theme="light"] .nav.scrolled .nav-in,[data-theme="light"] .pnav.scrolled .pnav-in{background:rgba(255,255,255,.86);box-shadow:0 18px 50px rgba(20,40,80,.18),0 0 0 1px rgba(13,148,136,.16)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:58px;width:min(1200px,94%)}
.nav-right{display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:10px;font-weight:600;font-size:18px;letter-spacing:-.01em}
.logo img{height:28px;width:28px;object-fit:contain;background:#fff;border-radius:8px;padding:3px;box-shadow:0 2px 10px rgba(0,0,0,.35),0 0 0 1px rgba(255,255,255,.06)}
.nav-links{display:flex;gap:26px;font-size:14px;font-weight:400;color:var(--muted)}
.nav-links a{transition:color .15s;position:relative;padding:4px 0}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--accent)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent-grad);border-radius:2px}
@media(max-width:640px){.nav-right{gap:14px}}

/* 主题切换 */
.theme-toggle{position:relative;width:36px;height:36px;border-radius:50%;border:1px solid var(--line);
  background:var(--panel);color:var(--ink);cursor:pointer;display:grid;place-items:center;transition:.18s,border-color var(--t)}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent);box-shadow:0 0 14px var(--accent-soft)}
.theme-toggle svg{width:16px;height:16px;position:absolute;transition:.2s}
.theme-toggle .i-sun{display:none}
[data-theme="light"] .theme-toggle .i-sun{display:block}
[data-theme="light"] .theme-toggle .i-moon{display:none}

/* 语言切换：滑动指示块 */
.lang-seg{position:relative;display:flex;gap:2px;align-items:center;background:var(--soft);border:1px solid var(--line);border-radius:var(--radius-pill);padding:3px}
.lang-seg button{position:relative;z-index:1;font:inherit;font-size:12.5px;font-weight:600;line-height:1;white-space:nowrap;color:var(--muted);background:transparent;border:0;padding:5px 11px;border-radius:var(--radius-pill);cursor:pointer;transition:color .25s}
.lang-seg button:hover{color:var(--ink)}
.lang-seg button.active{color:#04120f}

/* 响应式导航：窄屏折叠为汉堡菜单 */
.logo span{white-space:nowrap}
.nav-menu{display:contents}
.nav-burger{display:none;position:relative;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--panel);color:var(--ink);align-items:center;justify-content:center;cursor:pointer;transition:.18s,box-shadow var(--t);flex:0 0 auto}
.nav-burger:hover{border-color:var(--accent);color:var(--accent);box-shadow:0 0 12px var(--accent-soft)}
.nav-burger svg{width:18px;height:18px;position:absolute;transition:.2s}
.nav-burger .i-x{display:none}
.nav.open .nav-burger .i-bars{display:none}
.nav.open .nav-burger .i-x{display:inline}
@media(max-width:1100px){
  .nav-burger{display:inline-flex}
  .nav-menu{position:absolute;top:calc(100% + 10px);right:0;left:auto;z-index:60;min-width:230px;display:none;flex-direction:column;gap:3px;padding:10px;background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-lg)}
  .nav.open .nav-menu{display:flex}
  .nav-links,.pnav-links{flex-direction:column;width:100%;gap:2px;margin-left:0}
  .nav-links a,.pnav-links a{padding:10px 14px;border-radius:10px;display:block}
  .nav-links a:hover,.pnav-links a:hover{background:var(--soft);color:var(--ink)}
  .nav-links a.active{background:var(--soft)}
  .nav-links a.active::after,.pnav-links a.active::after{display:none}
  .nav-login{width:100%;justify-content:center;margin-top:8px}
}
.lang-seg__thumb{position:absolute;top:3px;bottom:3px;left:3px;z-index:0;border-radius:var(--radius-pill);background:var(--accent-grad);box-shadow:0 2px 10px var(--accent-soft);transition:transform .34s cubic-bezier(.4,0,.2,1),width .34s cubic-bezier(.4,0,.2,1);will-change:transform,width}

/* 产品目录网格 */
.pnav-brand{margin-right:auto}
.prod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.pcard{display:flex;gap:14px;align-items:flex-start;padding:20px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--panel);text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s,border-color .2s}
.pcard:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow-lg)}
.pc-thumb{flex:0 0 46px;height:46px;width:46px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:700;font-size:20px;position:relative;overflow:hidden}
.pc-thumb::after{content:attr(data-initial)}
.pc-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.pc-body{flex:1;min-width:0}
.pc-top{display:flex;align-items:center;gap:6px}
.pc-name{font-weight:600;font-size:16px}
.pc-go{color:var(--accent2)}
.pc-desc{margin-top:6px;color:var(--muted);font-size:13.5px;line-height:1.7}

/* ===== 平滑动效 Motion ===== */
.hero,.phero{overflow:hidden}
@media (prefers-reduced-motion: no-preference){
  section[id]{scroll-margin-top:82px}
  .hero-in{transition:transform .25s ease-out}

  .reveal{opacity:0;transform:translateY(26px) scale(.985);filter:blur(7px);
    transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1),filter .8s ease;will-change:opacity,transform}
  .reveal.in{opacity:1;transform:none;filter:none}

  .hero::before,.phero::before{content:"";position:absolute;inset:-25% -10% auto -10%;height:130%;z-index:-2;
    background:
      radial-gradient(38% 48% at 18% 32%,rgba(94,234,212,.20),transparent 60%),
      radial-gradient(42% 52% at 82% 18%,rgba(34,211,238,.18),transparent 60%),
      radial-gradient(48% 58% at 62% 82%,rgba(122,167,255,.15),transparent 60%);
    filter:blur(8px);animation:aurora 16s ease-in-out infinite alternate}
  .hero::after,.phero::after{content:"";position:absolute;width:360px;height:360px;border-radius:50%;z-index:-2;left:6%;top:8%;
    background:radial-gradient(circle,var(--accent-soft),transparent 70%);animation:floaty 10s ease-in-out infinite}
  @keyframes aurora{0%{transform:translate3d(-3%,-2%,0) rotate(0)}100%{transform:translate3d(4%,3%,0) rotate(8deg)}}
  @keyframes floaty{0%,100%{transform:translateY(0) translateX(0)}50%{transform:translateY(-28px) translateX(20px)}}

  .hero-title,.phero h1{background:var(--accent-grad);background-size:220% auto;-webkit-background-clip:text;background-clip:text;color:transparent;animation:gradMove 7s linear infinite}
  @keyframes gradMove{to{background-position:220% center}}

  .card,.wcard,.pcard{position:relative;transition:transform .35s cubic-bezier(.2,.7,.2,1),box-shadow .35s,border-color .35s}
  .wcard,.pcard{overflow:hidden}
  .card:hover,.wcard:hover,.pcard:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
  .card::after,.wcard::after,.pcard::after{content:"";position:absolute;inset:0;border-radius:inherit;padding:1.5px;
    background:var(--accent-grad);background-size:220% auto;
    -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;
    opacity:0;transition:opacity .4s;animation:gradMove 5s linear infinite;pointer-events:none}
  .card:hover::after,.wcard:hover::after,.pcard:hover::after{opacity:.85}

  .btn-primary{position:relative;overflow:hidden}
  .btn-primary::after{content:"";position:absolute;top:0;left:-130%;width:55%;height:100%;
    background:linear-gradient(100deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-18deg);
    animation:shimmer 3.4s ease-in-out infinite}
  @keyframes shimmer{0%{left:-60%}55%,100%{left:140%}}

  .hs-dot{animation:pulse 2.2s ease-in-out infinite}
  @keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(94,234,212,.55)}50%{box-shadow:0 0 0 8px rgba(94,234,212,0)}}

  .nav-links a::after{transform:scaleX(0);opacity:0;transition:transform .3s,opacity .3s}
  .nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1);opacity:1}

  .link-arrow::after{content:" →";display:inline-block;opacity:0;transform:translateX(-6px);transition:.25s}
  .link-arrow:hover::after{opacity:1;transform:translateX(0)}

  .chip:hover{transform:translateY(-2px)}

  /* 导航悬浮胶囊的动效基础已在普通规则中定义，此处仅保留 reduced-motion 兼容 */
}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:15px;
  padding:12px 26px;border-radius:var(--radius-pill);transition:.2s;line-height:1;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--accent-grad);color:#04120f;box-shadow:0 8px 26px var(--accent-soft)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 34px var(--accent-soft2)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.link-arrow{color:var(--accent);font-size:15px;font-weight:600;transition:.15s}
.link-arrow::after{content:" ›";font-weight:700}
.link-arrow:hover{color:var(--accent2);text-shadow:0 0 12px var(--accent-soft)}

/* 跑马灯节奏带 */
.marquee{position:relative;overflow:hidden;width:100%;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg2);padding:16px 0}
.marquee__track{display:flex;gap:46px;align-items:center;width:max-content;white-space:nowrap}
.marquee__track span{font-family:var(--mono);font-size:14px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.marquee__track span.ac{background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.marquee__track .sep{color:var(--accent);opacity:.7}
[data-parallax]{will-change:transform}
@media (prefers-reduced-motion: no-preference){
  .marquee__track{animation:marqueeScroll 30s linear infinite}
  .marquee:hover .marquee__track{animation-play-state:paused}
  @keyframes marqueeScroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
}

/* 导航登录按钮 + API 页面元件 */
.nav-login{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:600;white-space:nowrap;color:var(--ink);background:var(--panel);border:1px solid var(--line);padding:7px 14px;border-radius:var(--radius-pill);cursor:pointer;transition:.18s,box-shadow var(--t)}
.nav-login:hover{border-color:var(--accent);color:var(--accent);box-shadow:0 0 12px var(--accent-soft)}
.badge{display:inline-block;font-family:var(--mono);font-size:12px;font-weight:700;padding:3px 9px;border-radius:8px;letter-spacing:.04em;color:#04120f}
.badge.get{background:var(--accent)}
.badge.post{background:var(--accent2)}
.badge.put{background:var(--accent3)}
.code{font-family:var(--mono);font-size:13.5px;line-height:1.85;background:#0b0e12;color:#cfe9e3;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;overflow-x:auto;white-space:pre}
.code .c{color:#6b7280}
.endpoint{display:flex;gap:14px;align-items:baseline;padding:14px 0;border-bottom:1px solid var(--line)}
.endpoint:last-child{border-bottom:0}
.endpoint .ep-path{font-family:var(--mono);font-size:14px;color:var(--accent);white-space:nowrap}
.endpoint .ep-d{color:var(--muted);font-size:14px}

/* 区块 */
.section{padding:104px 0;border-top:1px solid var(--line);transition:border-color var(--t)}
.sec-head{display:flex;flex-direction:column;gap:12px;margin-bottom:54px}
.sec-eyebrow{font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
.sec-title{font-size:clamp(28px,4.6vw,46px);font-weight:600;letter-spacing:-.02em;line-height:1.1}

/* Hero */
.hero{position:relative;padding:128px 0 96px;text-align:center}
.hero-in{position:relative;z-index:1;max-width:840px;margin:0 auto}
.eyebrow{font-family:var(--mono);font-size:13px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.hero-title{font-size:clamp(44px,7.4vw,80px);font-weight:600;line-height:1.04;letter-spacing:-.03em}
.hero-sub{max-width:600px;margin:22px auto 0;font-size:clamp(16px,2.3vw,20px);color:var(--ink-2);line-height:1.5}
.tagline{margin-top:26px;font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.hero-status{display:inline-flex;align-items:center;gap:9px;margin-top:22px;
  font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.05em;color:var(--accent);
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-pill);padding:7px 15px}
.hero-status .hs-dot{width:8px;height:8px;border-radius:50%;background:#54d98b;box-shadow:0 0 10px #54d98b}
.hero-cta{display:flex;gap:16px;margin-top:34px;justify-content:center;align-items:center;flex-wrap:wrap}

/* Manifesto */
.manifesto{padding:0 0 28px;text-align:center}
.manifesto p{font-size:clamp(20px,3vw,32px);font-weight:600;line-height:1.34;max-width:860px;margin:0 auto;letter-spacing:-.01em}
.manifesto .muted{font-size:clamp(15px,2vw,18px);font-weight:400;color:var(--muted);margin-top:18px;line-height:1.6;max-width:680px}

/* 两栏 */
.split{display:grid;grid-template-columns:1.4fr 1fr;gap:56px;align-items:start}
@media(max-width:820px){.split{grid-template-columns:1fr;gap:34px}}
.split-main h2{font-size:clamp(24px,4vw,38px);font-weight:600;line-height:1.12;letter-spacing:-.02em;margin-bottom:20px}
.split-main p{color:var(--muted);margin-bottom:16px;font-size:16.5px}
.stats{border-radius:var(--radius);overflow:hidden;background:var(--panel);border:1px solid var(--line)}
.stat{display:flex;justify-content:space-between;gap:16px;padding:16px 18px;border-bottom:1px solid var(--line)}
.stat:last-child{border-bottom:0}
.stat dt{font-size:13px;color:var(--muted)}
.stat dd{font-weight:600;text-align:right}

/* 卡片（玻璃 + 光泽） */
.grid{display:grid;gap:18px}
.cols-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:820px){.cols-3{grid-template-columns:1fr}}
.card{position:relative;padding:32px 28px;border-radius:var(--radius-lg);background:var(--panel);
  border:1px solid var(--line);overflow:hidden;
  transition:transform .22s,box-shadow .22s,border-color .22s,background-color var(--t)}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.012) 42%,transparent 70%)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(94,234,212,.4)}
.card-idx{font-family:var(--mono);font-size:12px;font-weight:600;color:var(--accent);letter-spacing:.06em;margin-bottom:12px}
.card h3{font-size:21px;font-weight:600;margin-bottom:9px;letter-spacing:-.01em}
.card p{color:var(--muted);font-size:15px;line-height:1.6}

/* Works：玻璃磁贴 */
.works-grid{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.works-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.works-grid{grid-template-columns:1fr}}
.wcard{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
  transition:transform .22s,box-shadow .22s,border-color .22s,background-color var(--t)}
.wcard:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(94,234,212,.4)}
.wcard a{display:block}
.wcard-thumb{position:relative;height:144px;display:flex;align-items:center;justify-content:center;overflow:hidden;
  background:
    radial-gradient(120% 120% at 50% 0%,rgba(94,234,212,.22),transparent 60%),
    radial-gradient(120% 120% at 100% 100%,rgba(122,167,255,.18),transparent 60%),
    linear-gradient(160deg,#0c0e12,#15191f)}
.wcard-thumb::after{content:attr(data-initial);position:relative;z-index:1;
  font-family:var(--mono);font-weight:600;font-size:50px;color:var(--ink);letter-spacing:-.02em;
  text-shadow:0 0 22px rgba(94,234,212,.35)}
.wcard-body{padding:16px 18px 20px}
.wcard-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.wcard-name{font-size:17.5px;font-weight:600;letter-spacing:-.01em}
.wcard-go{font-size:15px;font-weight:700;color:var(--accent);transition:.18s}
.wcard:hover .wcard-go{transform:translate(3px,-3px);text-shadow:0 0 12px var(--accent-soft)}
.wcard-desc{color:var(--muted);font-size:14px;margin-top:6px;line-height:1.55}

/* 技术栈 */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{font-size:13.5px;font-weight:500;color:var(--ink-2);background:var(--panel);
  border:1px solid var(--line);padding:9px 16px;border-radius:var(--radius-pill);transition:.15s,border-color var(--t)}
.chip:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}

/* 里程碑 */
.timeline{list-style:none;position:relative;margin-left:6px}
.timeline::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--accent),var(--accent3))}
.tl{position:relative;padding:0 0 32px 40px}
.tl:last-child{padding-bottom:0}
.tl::before{content:"";position:absolute;left:0;top:5px;width:14px;height:14px;border-radius:50%;
  background:var(--bg);border:3px solid var(--accent);box-shadow:0 0 12px var(--accent-soft)}
.tl-year{font-family:var(--mono);font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--accent)}
.tl-body h3{font-size:18.5px;font-weight:600;margin:4px 0 6px}
.tl-body p{color:var(--muted);font-size:15px;max-width:680px;line-height:1.6}

/* Contact */
.contact-h{font-size:clamp(30px,5vw,52px);font-weight:600;letter-spacing:-.02em;margin-bottom:14px}
.contact-p{color:var(--ink-2);max-width:560px;margin-bottom:28px;font-size:17px;line-height:1.55}
.contact-links{display:flex;gap:32px;flex-wrap:wrap}
.contact-link{font-size:18px;font-weight:600;color:var(--accent);border-bottom:1px solid transparent;padding-bottom:2px;transition:.15s}
.contact-link:hover{border-color:var(--accent);color:var(--accent2);text-shadow:0 0 12px var(--accent-soft)}

/* 页脚 */
.footer{border-top:1px solid var(--line);padding:40px 0;margin-top:28px;background:var(--bg2);transition:background-color var(--t),border-color var(--t)}
.footer-in{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.footer-brand{display:flex;align-items:center;gap:10px;font-weight:600}
.footer-brand img{height:24px;width:24px;object-fit:contain;background:#fff;border-radius:7px;padding:2.5px;box-shadow:0 2px 8px rgba(0,0,0,.3)}
.footer-meta{font-family:var(--mono);font-size:12px;color:var(--muted)}
.footer-side{display:flex;flex-direction:column;align-items:flex-end;gap:6px;text-align:right}
.footer-origin{font-family:var(--mono);font-size:12px;color:var(--accent);opacity:.85}

/* ============ 产品页 ============ */
.pnav{position:sticky;top:0;z-index:40;background:rgba(8,9,11,.62);
  backdrop-filter:saturate(1.5) blur(22px);-webkit-backdrop-filter:saturate(1.5) blur(22px);
  border-bottom:1px solid var(--line);transition:background-color var(--t)}
[data-theme="light"] .pnav{background:rgba(255,255,255,.68)}
.pnav-in{display:flex;align-items:center;justify-content:space-between;height:50px}
.pnav-brand{font-weight:600;font-size:19px;letter-spacing:-.01em;
  background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.pnav-links{display:flex;gap:26px;font-size:14px;color:var(--muted);margin-left:auto}
.pnav-links a:hover{color:var(--ink)}
@media(max-width:640px){.pnav-in{padding:0 4px}}

.phero{text-align:center;padding:100px 0 72px}
.phero .eyebrow{font-size:14px}
.phero h1{font-size:clamp(40px,6.6vw,74px);font-weight:600;letter-spacing:-.03em;line-height:1.05}
.phero .sub{font-size:clamp(17px,2.5vw,22px);color:var(--ink-2);max-width:620px;margin:18px auto 0;line-height:1.45}
.phero .hero-cta{margin-top:30px}

.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
@media(max-width:900px){.bento{grid-template-columns:repeat(2,1fr)}}
.bento-item{position:relative;border-radius:var(--radius-lg);padding:28px;background:var(--panel);border:1px solid var(--line);overflow:hidden;
  transition:transform .22s,box-shadow .22s,border-color .22s,background-color var(--t)}
.bento-item::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.012) 42%,transparent 70%)}
.bento-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(94,234,212,.4)}
.bento-item.lg{grid-column:span 4}
.bento-item.sm{grid-column:span 2}
.bento-item.tall{grid-column:span 3}
@media(max-width:900px){.bento-item.lg,.bento-item.sm,.bento-item.tall{grid-column:span 2}}
.bento-ic{width:40px;height:40px;border-radius:12px;background:var(--accent-soft);color:var(--accent);
  display:grid;place-items:center;font-size:19px;margin-bottom:14px}
.bento-item h3{font-size:20px;font-weight:600;margin-bottom:8px}
.bento-item p{color:var(--muted);font-size:14.5px;line-height:1.6}

.feature{padding:96px 0;text-align:center}
.feature .big{font-size:clamp(26px,4.4vw,48px);font-weight:600;letter-spacing:-.02em;line-height:1.14;max-width:820px;margin:0 auto}
.feature .lead{color:var(--ink-2);font-size:clamp(16px,2.3vw,20px);max-width:640px;margin:18px auto 0;line-height:1.5}
.feature .visual{margin:42px auto 0;height:300px;border-radius:24px;position:relative;overflow:hidden;
  background:var(--accent-grad);box-shadow:var(--shadow-lg)}
.feature .visual::after{content:attr(data-label);position:absolute;inset:0;display:grid;place-items:center;
  color:#04120f;font-family:var(--mono);font-size:24px;font-weight:700;letter-spacing:-.01em}

.specs{max-width:760px;margin:0 auto}
.spec-row{display:flex;justify-content:space-between;gap:20px;padding:17px 4px;border-bottom:1px solid var(--line);font-size:16px}
.spec-row:last-child{border-bottom:0}
.spec-row dt{color:var(--muted);font-weight:400}
.spec-row dd{font-weight:600;text-align:right;max-width:60%}

.pcta{text-align:center;padding:96px 0}
.pcta h2{font-size:clamp(28px,5vw,48px);font-weight:600;letter-spacing:-.02em;margin-bottom:24px}

/* 进场动画 */
.reveal{opacity:0;transform:translateY(18px);transition:.6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
.cols-3 .card.reveal:nth-child(2){transition-delay:.06s}
.cols-3 .card.reveal:nth-child(3){transition-delay:.12s}
.works-grid .wcard.reveal:nth-child(2n){transition-delay:.04s}
.works-grid .wcard.reveal:nth-child(2n+1){transition-delay:0s}
.works-grid .wcard.reveal:nth-child(3n){transition-delay:.08s}
.chips .chip.reveal:nth-child(n){transition-delay:calc((var(--i,0)) * .03s)}
.timeline .tl.reveal:nth-child(2){transition-delay:.06s}
.timeline .tl.reveal:nth-child(3){transition-delay:.12s}
.timeline .tl.reveal:nth-child(4){transition-delay:.18s}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}