/* ============================================================
   顾城 · 个人站  |  深海流光 + 液态玻璃 + 大厂极简
   基底取自夜航客户端 .bg-flow（青蓝流动光斑），增强为三层流光
   ============================================================ */
:root{
  --bg0:#05070e; --bg1:#080c16;
  --ink:#f2f6ff; --sub:#a2b3ce; --dim:#6d7f9b;
  --ac:#4da3ff; --ac2:#38bdf8; --ac3:#7c5cff; --ac4:#2dd4bf;
  --line:rgba(255,255,255,.14);
  --glass:rgba(255,255,255,.062);
  --glass-2:rgba(255,255,255,.10);
  --r-xl:30px; --r-lg:24px; --r-md:16px; --r-sm:11px;
  --ease:cubic-bezier(.22,1,.36,1);
  --ease-io:cubic-bezier(.65,.05,.36,1);
  --shadow-1:0 18px 44px -26px rgba(0,0,0,.8);
  --shadow-2:0 34px 80px -34px rgba(0,0,0,.9);
  --blur:blur(22px) saturate(185%) brightness(1.06);
  --nav-h:62px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--bg0)}
body::after{content:none}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;min-height:100svh;color:var(--ink);background:transparent;
  font:16px/1.72 -apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;letter-spacing:.005em;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:rgba(77,163,255,.32);color:#fff}
:focus-visible{outline:2px solid var(--ac);outline-offset:3px;border-radius:8px}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.14);border-radius:99px;border:3px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,.26);background-clip:content-box}

/* ---------- 背景层：流动的光 ---------- */
.bg{position:fixed;inset:0;z-index:-4;overflow:hidden;pointer-events:none;background:
  radial-gradient(120% 80% at 50% -10%, #0a1424 0%, #05070e 58%, #04060b 100%)}
.flow{position:absolute;inset:-28%;filter:saturate(1.15)}
.flow i{position:absolute;display:block;border-radius:50%;will-change:transform;mix-blend-mode:screen}
.flow i:nth-child(1){width:56vmax;height:56vmax;left:-14vmax;top:-16vmax;
  background:radial-gradient(circle at 50% 50%,rgba(56,189,248,.52) 0%,rgba(56,189,248,.26) 22%,rgba(56,189,248,.09) 48%,transparent 72%);
  animation:drift1 26s var(--ease-io) infinite alternate}
.flow i:nth-child(2){width:50vmax;height:50vmax;right:-12vmax;bottom:-14vmax;
  background:radial-gradient(circle at 50% 50%,rgba(124,92,255,.46) 0%,rgba(124,92,255,.22) 22%,rgba(124,92,255,.08) 48%,transparent 70%);
  animation:drift2 34s var(--ease-io) infinite alternate}
.flow i:nth-child(3){width:42vmax;height:42vmax;left:36%;top:28%;
  background:radial-gradient(circle at 50% 50%,rgba(45,212,191,.40) 0%,rgba(45,212,191,.18) 24%,rgba(45,212,191,.06) 50%,transparent 72%);
  animation:drift3 42s var(--ease-io) infinite alternate}
.flow::after{content:"";position:absolute;inset:-34%;
  background:conic-gradient(from 0deg,transparent 0 52%,rgba(77,163,255,.075) 68%,transparent 84%);
  animation:spin 72s linear infinite}
@keyframes drift1{0%{transform:translate3d(0,0,0) scale(1)}50%{transform:translate3d(9vw,7vh,0) scale(1.12)}100%{transform:translate3d(-6vw,11vh,0) scale(.94)}}
@keyframes drift2{0%{transform:translate3d(0,0,0) scale(1)}50%{transform:translate3d(-10vw,-6vh,0) scale(1.1)}100%{transform:translate3d(5vw,-12vh,0) scale(.92)}}
@keyframes drift3{0%{transform:translate3d(0,0,0) scale(.96)}50%{transform:translate3d(-7vw,9vh,0) scale(1.16)}100%{transform:translate3d(8vw,-5vh,0) scale(1)}}
@keyframes spin{to{transform:rotate(360deg)}}

#stars{position:fixed;inset:0;z-index:-3;pointer-events:none}
.grain{position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.038;
  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' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E")}
.vig{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:radial-gradient(125% 95% at 50% -5%,transparent 38%,rgba(2,4,9,.5) 78%,rgba(2,4,9,.72) 100%)}
.spot{position:fixed;width:520px;height:520px;left:0;top:0;z-index:-2;pointer-events:none;opacity:0;
  border-radius:50%;transform:translate3d(-50%,-50%,0);transition:opacity .5s ease;
  background:radial-gradient(circle at 50% 50%,rgba(77,163,255,.14),rgba(77,163,255,.05) 42%,transparent 68%)}

.bg::after{content:"";position:absolute;left:-45%;top:16%;width:190%;height:48%;pointer-events:none;
  background:linear-gradient(100deg,transparent 0%,rgba(56,189,248,.11) 24%,rgba(124,92,255,.14) 50%,rgba(45,212,191,.10) 74%,transparent 100%);
  filter:blur(56px);transform:rotate(-8deg);animation:aurora 26s var(--ease-io) infinite alternate}
@keyframes aurora{
  0%{transform:translate3d(-9%,-5%,0) rotate(-8deg) scaleY(.9)}
  100%{transform:translate3d(9%,7%,0) rotate(-8deg) scaleY(1.12)}}

/* ---------- 顶部玻璃导航 ---------- */
.ytop{position:fixed;top:0;left:0;right:0;z-index:9000;height:calc(var(--nav-h) + env(safe-area-inset-top));
  padding-top:env(safe-area-inset-top);display:flex;align-items:center;
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  background:linear-gradient(to bottom,rgba(8,12,22,.82),rgba(8,12,22,.42) 62%,transparent);
  -webkit-mask-image:linear-gradient(to bottom,#000 0 66%,transparent 100%);
  mask-image:linear-gradient(to bottom,#000 0 66%,transparent 100%);
  transition:background .35s ease}
.ytop-in{width:100%;max-width:1080px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:14px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em;font-size:15px}
.mark{width:30px;height:30px;flex:none;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(160deg,rgba(255,255,255,.22),rgba(255,255,255,.06));
  border:1px solid rgba(255,255,255,.22);box-shadow:inset 0 1px 0 rgba(255,255,255,.4),0 8px 20px -12px rgba(77,163,255,.7);
  color:#fff;font-size:14px;font-weight:800}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--sub);letter-spacing:.04em}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px;padding:5px;border-radius:999px;
  background:var(--glass);border:1px solid var(--line);box-shadow:inset 0 1px 0 rgba(255,255,255,.16),var(--shadow-1);
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur)}
.nav a{padding:7px 13px;border-radius:999px;font-size:13px;color:var(--sub);font-weight:600;
  transition:color .2s ease,background-color .2s ease,transform .18s var(--ease)}
.nav a:hover{color:var(--ink);background:rgba(255,255,255,.09)}
.nav a.on{color:#fff;background:rgba(77,163,255,.2);box-shadow:inset 0 1px 0 rgba(255,255,255,.22)}
.nav a:active{transform:scale(.96)}
.prog{position:fixed;top:0;left:0;height:2px;z-index:9100;width:0;
  background:linear-gradient(90deg,var(--ac2),var(--ac),var(--ac3));box-shadow:0 0 12px rgba(77,163,255,.7);
  transition:width .12s linear}

/* ---------- 布局 ---------- */
main{position:relative;z-index:1}
.sec{max-width:1080px;margin:0 auto;padding:96px 20px}
.sec:first-of-type{padding-top:calc(var(--nav-h) + env(safe-area-inset-top) + 56px)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ac2);margin:0 0 14px}
.eyebrow::before{content:"";width:22px;height:1px;background:linear-gradient(90deg,transparent,var(--ac2))}
h2.t{font-size:clamp(22px,3.6vw,30px);line-height:1.24;margin:0 0 12px;font-weight:800;letter-spacing:-.025em}
p.lead{color:var(--sub);margin:0;max-width:62ch;font-size:15.5px}

/* ---------- Hero ---------- */
.hero{min-height:calc(100svh - var(--nav-h));display:flex;flex-direction:column;justify-content:center;
  max-width:1080px;margin:0 auto;padding:0 20px}
.hero .hi{display:block;font-size:clamp(15px,2.2vw,17px);color:var(--sub);font-weight:600;letter-spacing:.2em;margin-bottom:18px}
.hero h1{margin:0;font-weight:900;letter-spacing:-.045em;line-height:1.02;font-size:clamp(46px,10.5vw,104px)}
.hero h1 .ch{display:inline-block;will-change:transform,filter,opacity;
  opacity:0;transform:translateY(.42em) scale(.94);filter:blur(14px);
  animation:chIn .9s var(--ease) forwards;animation-delay:calc(var(--d) * 1ms)}
@keyframes chIn{to{opacity:1;transform:none;filter:blur(0)}}
.hero h1 .accent{color:var(--ac2)}
.hero .line{width:0;height:1px;margin:30px 0 26px;background:linear-gradient(90deg,var(--ac2),rgba(77,163,255,.25),transparent);
  animation:lineIn 1.1s var(--ease) .5s forwards}
@keyframes lineIn{to{width:min(320px,62%)}}
.hero p{font-size:clamp(15px,2.1vw,18px);color:var(--sub);max-width:52ch;margin:0}
.hero p b{color:var(--ink);font-weight:700}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.hint{margin-top:38px;display:flex;align-items:center;gap:9px;color:var(--dim);font-size:12.5px}
.hint i{width:20px;height:30px;border:1px solid rgba(255,255,255,.24);border-radius:11px;position:relative}
.hint i::after{content:"";position:absolute;left:50%;top:6px;width:3px;height:6px;margin-left:-1.5px;border-radius:2px;
  background:var(--ac2);animation:wheel 1.9s var(--ease-io) infinite}
@keyframes wheel{0%{opacity:0;transform:translateY(-2px)}30%{opacity:1}70%{opacity:1;transform:translateY(9px)}100%{opacity:0;transform:translateY(11px)}}

/* ---------- 液态玻璃 ---------- */
.glass{position:relative;isolation:isolate;border-radius:var(--r-lg);border:1px solid var(--line);
  background:linear-gradient(168deg,rgba(255,255,255,.09),rgba(255,255,255,.035) 42%,rgba(255,255,255,.055));
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.34),inset 0 -1px 0 rgba(255,255,255,.07),var(--shadow-1);
  transition:transform .3s var(--ease),box-shadow .35s ease,border-color .3s ease,background-color .3s ease}
.glass::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:-1;
  background:radial-gradient(120% 80% at 12% 0%,rgba(255,255,255,.22),transparent 46%)}
.glass::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  padding:1px;background:linear-gradient(140deg,rgba(255,255,255,.5),rgba(255,255,255,.04) 38%,transparent 62%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;
  opacity:.5;transition:opacity .35s ease}
@media (hover:hover) and (pointer:fine){
  .glass:hover{border-color:rgba(255,255,255,.26);box-shadow:inset 0 1px 0 rgba(255,255,255,.42),var(--shadow-2),0 0 0 1px rgba(255,255,255,.05)}
  .glass:hover::after{opacity:1}
}
.glass:active{box-shadow:inset 0 2px 14px rgba(0,0,0,.28),inset 0 1px 0 rgba(255,255,255,.3),var(--shadow-1)}

.cards{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));margin-top:34px}
.card{padding:26px 24px}
.card h3{margin:0 0 10px;font-size:17px;font-weight:750;letter-spacing:-.015em;display:flex;align-items:center;gap:10px}
.card h3 svg{width:20px;height:20px;flex:none;color:var(--ac2)}
.card p{margin:0;color:var(--sub);font-size:14.5px}
.card .k{display:block;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--dim);margin-bottom:12px}

/* 作品卡（夜航） */
.feature{padding:32px;display:grid;gap:26px;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);align-items:center;margin-top:34px}
@media (max-width:760px){.feature{grid-template-columns:1fr;padding:26px 22px}}
.feature h3{margin:0 0 12px;font-size:clamp(20px,3vw,26px);font-weight:800;letter-spacing:-.03em}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0}
.tag{font-size:12px;font-weight:650;padding:5px 12px;border-radius:999px;color:#cfe4ff;
  background:rgba(77,163,255,.14);border:1px solid rgba(77,163,255,.26)}
.logo-3d{aspect-ratio:1;width:min(100%,240px);margin:0 auto;border-radius:30px;display:grid;place-items:center;
  background:linear-gradient(160deg,rgba(255,255,255,.18),rgba(255,255,255,.04));
  border:1px solid rgba(255,255,255,.2);box-shadow:inset 0 1px 0 rgba(255,255,255,.42),0 40px 80px -40px rgba(77,163,255,.6);
  animation:float 7s var(--ease-io) infinite alternate}
@keyframes float{from{transform:translateY(-8px)}to{transform:translateY(8px)}}
.logo-3d svg{width:56%;height:56%;color:#eaf4ff;filter:drop-shadow(0 12px 26px rgba(56,189,248,.5))}

/* ---------- 按钮 ---------- */
.btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:14px 22px;border-radius:14px;font-size:15px;font-weight:700;cursor:pointer;border:1px solid transparent;
  color:#04121f;background:linear-gradient(180deg,#8fd0ff,#4da3ff);
  box-shadow:0 14px 34px -16px rgba(77,163,255,.85),inset 0 1px 0 rgba(255,255,255,.5);
  transition:transform .16s var(--ease),filter .2s ease,box-shadow .25s ease;will-change:transform}
.btn:active{transform:scale(.965)}
.btn.ghost{color:var(--ink);background:var(--glass);border-color:var(--line);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.28),var(--shadow-1);
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur)}
.btn svg{width:17px;height:17px;flex:none}
.btn::after{content:"";position:absolute;top:0;bottom:0;left:-60%;width:45%;pointer-events:none;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-18deg);opacity:0}
@media (hover:hover) and (pointer:fine){
  .btn:not(.ghost):hover{filter:brightness(1.05);box-shadow:0 20px 44px -18px rgba(77,163,255,.95),inset 0 1px 0 rgba(255,255,255,.6)}
  .btn.ghost:hover{border-color:rgba(255,255,255,.28);background:var(--glass-2)}
  .btn:hover::after{opacity:1;animation:sheen .8s var(--ease)}
}
@keyframes sheen{from{left:-60%}to{left:120%}}
.acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}

/* ---------- 滚动入场 ---------- */
.rv{opacity:0;transform:translateY(20px);filter:blur(10px);
  transition:opacity .72s var(--ease),transform .72s var(--ease),filter .72s var(--ease);
  transition-delay:calc(var(--i,0) * 70ms)}
.rv.in{opacity:1;transform:none;filter:blur(0)}

/* ---------- 页脚 ---------- */
footer{max-width:1080px;margin:0 auto;padding:56px 20px calc(56px + env(safe-area-inset-bottom));
  color:var(--dim);font-size:13px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  border-top:1px solid rgba(255,255,255,.07)}
footer a{color:var(--sub);transition:color .2s ease}
footer a:hover{color:var(--ink)}
.totop{position:fixed;right:18px;bottom:calc(18px + env(safe-area-inset-bottom));z-index:9000;width:46px;height:46px;
  border-radius:50%;display:grid;place-items:center;cursor:pointer;border:1px solid var(--line);color:var(--ink);
  background:var(--glass);-webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.3),var(--shadow-1);
  opacity:0;transform:translateY(12px) scale(.9);pointer-events:none;transition:opacity .35s ease,transform .35s var(--ease)}
.totop.on{opacity:1;transform:none;pointer-events:auto}
.totop:active{transform:scale(.94)}

/* ---------- 开场转场 ---------- */
#intro{position:fixed;inset:0;z-index:9800;display:grid;place-items:center;background:#05070e;
  transition:opacity .7s var(--ease),clip-path .9s var(--ease),visibility .9s}
#intro.done{opacity:0;visibility:hidden;clip-path:inset(0 0 100% 0)}
#intro .ib{text-align:center}
#intro .m{width:54px;height:54px;margin:0 auto 16px;border-radius:16px;display:grid;place-items:center;
  background:linear-gradient(160deg,rgba(255,255,255,.2),rgba(255,255,255,.05));border:1px solid rgba(255,255,255,.24);
  color:#fff;font-weight:800;font-size:20px;box-shadow:inset 0 1px 0 rgba(255,255,255,.4),0 20px 50px -24px rgba(77,163,255,.8);
  animation:pulse 1.6s var(--ease-io) infinite}
@keyframes pulse{0%,100%{transform:scale(1);opacity:.9}50%{transform:scale(1.06);opacity:1}}
#intro .s{font-size:12px;letter-spacing:.34em;color:var(--dim);text-transform:uppercase}
#intro .bar{width:132px;height:2px;margin:18px auto 0;border-radius:2px;background:rgba(255,255,255,.12);overflow:hidden}
#intro .bar i{display:block;height:100%;width:40%;border-radius:2px;background:linear-gradient(90deg,var(--ac2),var(--ac3));
  animation:load 1.05s var(--ease-io) infinite}
@keyframes load{0%{transform:translateX(-110%)}100%{transform:translateX(260%)}}

/* ---------- 提示条 ---------- */
#toast{position:fixed;left:50%;bottom:calc(26px + env(safe-area-inset-bottom));z-index:9500;
  transform:translate(-50%,26px);opacity:0;pointer-events:none;padding:11px 18px;border-radius:999px;font-size:13.5px;
  background:rgba(10,16,28,.82);border:1px solid var(--line);color:var(--ink);
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.26),var(--shadow-1);
  transition:opacity .32s ease,transform .32s var(--ease)}
#toast.on{opacity:1;transform:translate(-50%,0)}

/* ---------- 视差与动效降级 ---------- */
.px{will-change:transform}
@media (prefers-reduced-motion:reduce){
  .flow i,.flow::after,.logo-3d,.hint i::after,#intro .m,#intro .bar i{animation:none}
  .rv{opacity:1;transform:none;filter:none}
  .hero h1 .ch{opacity:1;transform:none;filter:none;animation:none}
  .hero .line{width:min(320px,62%)}
}
@media (max-width:640px){
  .sec{padding:72px 18px}
  .nav a{padding:7px 10px;font-size:12.5px}
  .brand small{display:none}
}