/* oneirictech.space — 入口页视觉系统
   与 site.css 分离：入口页是"场"，四个模块各自独立、各有各的强调色与 hover 语言。 */

:root{
  --ink:#e6eaf2; --dim:#7d8798; --faint:#4d5666; --line:#1b2230;
  --bg:#06070a; --panel:#0a0d13;
  --a1:#4a9eff; --a2:#5fd0a8; --a3:#e8a33d; --a4:#b8c4d6;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.7 "Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body.intro-lock{overflow:hidden}

/* 底层：WebGL 场 */
#field{position:fixed;inset:0;width:100%;height:100%;z-index:0;opacity:0;transition:opacity 1.1s var(--ease)}
body.has-field #field{opacity:1}
/* 无 WebGL / 移动端 / 减少动效时的静态底 */
body::before{
  content:'';position:fixed;inset:0;z-index:0;
  background:
    radial-gradient(120% 80% at 50% 108%, rgba(74,158,255,.16), transparent 62%),
    linear-gradient(180deg,#06070a 0%,#080b12 55%,#0a0e16 100%);
}
body.has-field::before{opacity:0;transition:opacity 1.1s var(--ease)}

/* ── 加载页 ───────────────────────────────────────────────── */
#boot{position:fixed;inset:0;z-index:100;background:#040507;display:grid;place-items:center;
  transition:opacity .5s var(--ease)}
#boot.gone{opacity:0;pointer-events:none}
.boot-in{width:min(420px,80vw)}
.boot-tag{font:11px/1 ui-monospace,Consolas,monospace;letter-spacing:.22em;color:var(--faint);
  display:flex;justify-content:space-between;margin-bottom:12px}
.boot-bar{height:1px;background:#151b26;position:relative;overflow:hidden}
.boot-fill{position:absolute;inset:0;width:0;background:linear-gradient(90deg,transparent,var(--a1));
  transition:width .12s linear}
.boot-scan{position:absolute;top:0;bottom:0;width:64px;
  background:linear-gradient(90deg,transparent,rgba(74,158,255,.55),transparent);
  animation:scan 1.15s linear infinite}
@keyframes scan{from{transform:translateX(-64px)}to{transform:translateX(420px)}}
.boot-note{margin-top:14px;font:11px/1.6 ui-monospace,Consolas,monospace;color:#39414f;letter-spacing:.06em}

/* ── 入场走廊层（Three.js） ───────────────────────────────── */
#intro{position:fixed;inset:0;z-index:90;background:#fff;display:grid;place-items:center}
#intro.gone{display:none}
#intro canvas{display:block;width:100%;height:100%}
#load{position:absolute;inset:0;display:grid;place-items:center;background:#fff;transition:opacity .3s}
#load .box{width:min(320px,78vw);text-align:center;color:#8b93a1;font:11px/1 ui-monospace,Consolas,monospace;letter-spacing:.16em}
#track{height:1px;background:#e2e5ea;margin-top:12px}
#fill{height:100%;width:0;background:#111;transition:width .15s linear}
#skip{position:absolute;right:20px;bottom:18px;font:11px/1 ui-monospace,Consolas,monospace;
  color:#9aa2ae;letter-spacing:.14em;cursor:pointer;user-select:none}
#flash{position:absolute;inset:0;background:#fff;opacity:0;pointer-events:none}

/* ── 内容层 ───────────────────────────────────────────────── */
.shell{position:relative;z-index:2;max-width:1120px;margin:0 auto;padding:96px 28px 72px;
  opacity:0;transform:translateY(14px);transition:opacity .9s var(--ease) .1s,transform .9s var(--ease) .1s}
body.entered .shell{opacity:1;transform:none}

.top{display:flex;justify-content:space-between;align-items:baseline;gap:20px;flex-wrap:wrap;
  border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:14px}
h1{font-size:clamp(30px,5.2vw,46px);line-height:1.08;letter-spacing:-.025em;margin:0;font-weight:600}
.top .role{font:12px/1 ui-monospace,Consolas,monospace;letter-spacing:.16em;color:var(--dim);
  text-transform:uppercase;white-space:nowrap}
.lead{max-width:60ch;color:var(--dim);font-size:16px;margin:22px 0 0}
.lead b{color:var(--ink);font-weight:500}

/* 四个独立模块 */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:56px}
@media(max-width:820px){.grid{grid-template-columns:1fr}}
.mod{
  --acc:var(--a1);
  position:relative;display:block;text-decoration:none;color:inherit;
  background:linear-gradient(180deg,rgba(10,13,19,.86),rgba(8,11,16,.92));
  border:1px solid var(--line);border-radius:3px;
  padding:30px 28px 26px;min-height:230px;
  transform-style:preserve-3d;
  transform:perspective(900px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg));
  transition:border-color .3s var(--ease),transform .35s var(--ease),opacity .7s var(--ease) var(--d,0ms);
  opacity:0;
}
body.entered .mod{opacity:1}
.mod::before{
  content:'';position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .35s;
  background:radial-gradient(240px 160px at var(--mx,50%) var(--my,50%),
    color-mix(in srgb,var(--acc) 16%,transparent),transparent 70%);
}
.mod:hover::before{opacity:1}
.mod:hover{border-color:color-mix(in srgb,var(--acc) 42%,var(--line))}
.mod:focus-visible{outline:1px solid var(--acc);outline-offset:3px}

.mod .no{font:11px/1 ui-monospace,Consolas,monospace;letter-spacing:.2em;color:var(--faint)}
.mod h2{font-size:22px;letter-spacing:-.015em;margin:14px 0 0;font-weight:600}
.mod .aud{display:block;margin-top:9px;font:11px/1 ui-monospace,Consolas,monospace;
  letter-spacing:.13em;text-transform:uppercase;color:var(--acc);opacity:.85}
.mod p{color:var(--dim);font-size:14.5px;margin:14px 0 0;max-width:38ch}
.mod .meta{position:absolute;left:28px;right:28px;bottom:20px;display:flex;gap:8px;flex-wrap:wrap}
.mod .meta i{font-style:normal;font:10.5px/1 ui-monospace,Consolas,monospace;letter-spacing:.06em;
  color:var(--faint);border:1px solid var(--line);padding:4px 7px;border-radius:2px}

/* 每个模块独有的 hover 微动画 —— 让它们真的互不相同 */
.mod:hover .sweep{transform:translateX(100%)}
.sweep{position:absolute;left:0;top:0;bottom:0;width:100%;pointer-events:none;overflow:hidden}
.sweep::after{content:'';position:absolute;inset:0;transform:translateX(-100%);
  background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--acc) 12%,transparent),transparent);
  transition:transform .85s var(--ease)}
.m1 .rule{position:absolute;left:28px;right:28px;top:0;height:1px;background:var(--acc);
  transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.m1:hover .rule{transform:scaleX(1)}
.m2 .bars{position:absolute;right:26px;top:26px;display:flex;gap:3px;align-items:flex-end;height:26px}
.m2 .bars i{width:3px;background:var(--acc);opacity:.25;height:30%;transition:height .4s var(--ease),opacity .4s}
.m2:hover .bars i{opacity:.85}
.m2:hover .bars i:nth-child(1){height:60%}
.m2:hover .bars i:nth-child(2){height:100%;transition-delay:.06s}
.m2:hover .bars i:nth-child(3){height:42%;transition-delay:.12s}
.m2:hover .bars i:nth-child(4){height:78%;transition-delay:.18s}
.m3 .dots{position:absolute;right:26px;top:28px;display:grid;grid-template-columns:repeat(4,5px);gap:4px}
.m3 .dots i{width:5px;height:5px;background:var(--acc);opacity:.18;transition:opacity .3s}
.m3:hover .dots i{opacity:.9}
.m3:hover .dots i:nth-child(odd){transition-delay:.1s}
.m4 .caret{display:inline-block;width:7px;height:15px;background:var(--acc);vertical-align:-2px;
  margin-left:6px;opacity:0}
.m4:hover .caret{opacity:1;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

/* 底部 */
.foot{margin-top:64px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font:12px/1.6 ui-monospace,Consolas,monospace;color:var(--faint);letter-spacing:.04em}
.foot a{color:var(--dim);text-decoration:none;border-bottom:1px solid transparent;transition:.2s}
.foot a:hover{color:var(--a1);border-bottom-color:var(--a1)}

@media(prefers-reduced-motion:reduce){
  #field{display:none}
  .shell,.mod{opacity:1!important;transform:none!important;transition:none!important}
  .sweep::after,.m2 .bars i,.m1 .rule{transition:none!important}
  #boot .boot-scan{animation:none}
}