:root{
  --bg:#01030a;
  --deep:#060b18;
  --blue:#0c2946;
  --ink:#eaf0ff;
  --muted:#8ea0c4;
  --amber:#ff7a45;
  --amber-2:#ffb347;
  --cyan:#5ad2ff;
  --font-display:"Space Grotesk",system-ui,sans-serif;
  --font-body:"Inter",system-ui,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
html{scrollbar-width:none}
body::-webkit-scrollbar{display:none}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
/* 进入体验前锁定滚动 */
body:not(.is-live){overflow:hidden;height:100vh}
a{color:inherit;text-decoration:none}

/* 桌面隐藏系统光标，用自定义 */
@media (hover:hover) and (pointer:fine){
  body{cursor:none}
  a,button{cursor:none}
}

/* ---------- WebGL 背景 ---------- */
#webgl{position:fixed;inset:0;width:100vw;height:100vh;display:block;z-index:1}
.scrim{
  position:fixed;inset:0;z-index:2;pointer-events:none;
  background:
    radial-gradient(120% 80% at 50% 8%, transparent 40%, rgba(1,3,10,.35) 100%),
    linear-gradient(180deg, rgba(1,3,10,.55) 0%, transparent 22%, transparent 74%, rgba(1,3,10,.85) 100%);
}

/* ---------- 自定义光标 ---------- */
.cursor{position:fixed;left:0;top:0;z-index:120;pointer-events:none;mix-blend-mode:screen}
.cursor__dot{
  position:fixed;left:0;top:0;width:6px;height:6px;border-radius:50%;
  background:var(--ink);transform:translate(-50%,-50%);
}
.cursor__ring{
  position:fixed;left:0;top:0;width:34px;height:34px;border-radius:50%;
  border:1.5px solid rgba(234,240,255,.55);transform:translate(-50%,-50%);
  transition:width .3s var(--ease),height .3s var(--ease),border-color .3s,opacity .3s;
}
.cursor.is-focus .cursor__ring{width:56px;height:56px;border-color:var(--amber-2)}
.cursor.is-hidden{opacity:0}
@media (hover:none),(pointer:coarse){ .cursor{display:none} }

/* ---------- 预加载 ---------- */
.preloader{
  position:fixed;inset:0;z-index:110;background:var(--bg);
  display:grid;place-items:center;transition:opacity .8s var(--ease),visibility .8s;
}
.preloader.is-done{opacity:0;visibility:hidden}
.preloader__inner{width:min(88vw,420px);text-align:center}
.brand-mark{display:flex;gap:34px;justify-content:center;margin-bottom:34px;height:22px;align-items:center}
.eye{
  width:46px;height:10px;border-radius:60% 60% 40% 40%/100% 100% 0 0;
  background:linear-gradient(180deg,var(--amber-2),var(--amber));
  filter:drop-shadow(0 0 12px rgba(255,140,70,.8));
  transform:rotate(8deg);animation:blink 3.4s var(--ease) infinite;
}
.eye--r{transform:rotate(-8deg);animation-delay:.15s}
@keyframes blink{0%,92%,100%{transform:scaleY(1) rotate(8deg)}96%{transform:scaleY(.15) rotate(8deg)}}
.preloader__word{font-family:var(--font-display);font-weight:700;letter-spacing:.5em;font-size:clamp(22px,4vw,30px);padding-left:.5em;margin-bottom:26px}
.preloader__bar{height:2px;width:100%;background:rgba(255,255,255,.12);border-radius:2px;overflow:hidden}
.preloader__bar span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--amber),var(--cyan));transition:width .3s linear}
.preloader__meta{display:flex;justify-content:space-between;margin-top:12px;font-size:11px;letter-spacing:.18em;color:var(--muted)}
.enter-btn{
  margin-top:34px;background:transparent;color:var(--ink);border:1px solid rgba(255,255,255,.25);
  font-family:var(--font-display);letter-spacing:.24em;font-size:12px;padding:15px 30px;border-radius:40px;
  opacity:0;transform:translateY(8px);transition:.5s var(--ease);pointer-events:none;position:relative;overflow:hidden;
}
.enter-btn.is-ready{opacity:1;transform:none;pointer-events:auto}
.enter-btn::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--amber),var(--amber-2));transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease);z-index:-1}
.enter-btn:hover{color:#0a0a0a;border-color:transparent}
.enter-btn:hover::before{transform:scaleX(1)}

/* ---------- 顶栏 ---------- */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:26px clamp(20px,4vw,54px);
  opacity:0;transform:translateY(-14px);transition:.9s var(--ease);
}
.topbar.is-in{opacity:1;transform:none}
.logo{font-family:var(--font-display);font-weight:700;letter-spacing:.28em;font-size:15px;display:flex;align-items:center;gap:10px}
.logo__glyph{width:16px;height:16px;border-radius:4px;background:linear-gradient(135deg,var(--amber),var(--cyan));box-shadow:0 0 14px rgba(90,210,255,.5)}
.topnav{display:flex;align-items:center;gap:22px}
.nav-link{font-family:var(--font-display);font-size:12px;letter-spacing:.2em;color:var(--muted);transition:color .3s}
.nav-link:hover{color:var(--ink)}
.sound-toggle{background:none;border:0;display:flex;align-items:flex-end;gap:3px;height:16px}
.sound-toggle__bar{width:3px;height:6px;background:var(--muted);border-radius:2px;transition:height .25s var(--ease),background .25s}
.sound-toggle[aria-pressed="true"] .sound-toggle__bar{background:var(--cyan)}
.sound-toggle[aria-pressed="true"] .sound-toggle__bar:nth-child(1){height:8px;animation:eq .9s ease-in-out infinite}
.sound-toggle[aria-pressed="true"] .sound-toggle__bar:nth-child(2){height:16px;animation:eq .9s ease-in-out .2s infinite}
.sound-toggle[aria-pressed="true"] .sound-toggle__bar:nth-child(3){height:11px;animation:eq .9s ease-in-out .4s infinite}
@keyframes eq{0%,100%{transform:scaleY(.5)}50%{transform:scaleY(1)}}

/* ---------- 圆点分节导航 ---------- */
.dots{position:fixed;right:clamp(14px,2.4vw,30px);top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:16px;opacity:0;transition:opacity .8s}
.dots.is-in{opacity:1}
.dot{position:relative;display:flex;align-items:center;justify-content:flex-end;gap:12px;background:none;border:0}
.dot__label{font-family:var(--font-display);font-size:10px;letter-spacing:.14em;color:var(--muted);opacity:0;transform:translateX(6px);transition:.4s var(--ease);white-space:nowrap}
.dot__pt{width:8px;height:8px;border-radius:50%;border:1.5px solid rgba(255,255,255,.4);transition:.4s var(--ease)}
.dot:hover .dot__label{opacity:1;transform:none}
.dot.is-active .dot__pt{background:var(--amber);border-color:var(--amber);box-shadow:0 0 12px rgba(255,122,69,.8);transform:scale(1.15)}
.dot.is-active .dot__label{opacity:1;transform:none;color:var(--ink)}

/* ---------- 按住蓄力按钮 ---------- */
.hold{
  position:fixed;left:50%;top:58%;transform:translate(-50%,-50%) scale(.7);z-index:55;
  width:120px;height:120px;background:none;border:0;
  opacity:0;visibility:hidden;transition:opacity .5s var(--ease),transform .5s var(--ease),visibility .5s;
}
.hold.is-in{opacity:1;visibility:visible;transform:translate(-50%,-50%) scale(1)}
.hold__svg{width:100%;height:100%;transform:rotate(-90deg)}
.hold__track{fill:none;stroke:rgba(255,255,255,.18);stroke-width:2}
.hold__prog{fill:none;stroke:var(--amber-2);stroke-width:3;stroke-linecap:round;
  stroke-dasharray:327;stroke-dashoffset:327;filter:drop-shadow(0 0 6px rgba(255,150,70,.9));transition:stroke-dashoffset .06s linear}
.hold__label{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--font-display);font-size:11px;letter-spacing:.14em;line-height:1.5;text-align:center;color:var(--ink)}
.hold.is-charging{transform:translate(-50%,-50%) scale(1.06)}

/* ---------- 滚动叙事文字 ---------- */
.scroll{position:relative;z-index:20}
.chapter{min-height:100vh;display:flex;align-items:center;padding:0 clamp(22px,7vw,120px);pointer-events:none}
.chapter__inner{max-width:640px;pointer-events:auto}
.chapter__inner.center{margin:0 auto;text-align:center;max-width:760px}
.chapter__inner.right{margin-left:auto;text-align:right}
.eyebrow{font-family:var(--font-display);font-size:12px;letter-spacing:.32em;color:var(--amber-2);margin-bottom:22px}
.title{font-family:var(--font-display);font-weight:500;font-size:clamp(40px,7.4vw,92px);line-height:1.02;letter-spacing:-.01em}
.title--md{font-size:clamp(34px,6vw,74px)}
.lede{margin-top:22px;font-size:clamp(15px,1.5vw,19px);line-height:1.7;color:var(--muted);font-weight:300;max-width:46ch}
.chapter__inner.center .lede{margin-left:auto;margin-right:auto}
.chapter__inner.right .lede{margin-left:auto}
.scroll-hint{margin-top:46px;font-family:var(--font-display);font-size:11px;letter-spacing:.24em;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:12px}
.scroll-hint span{width:1px;height:40px;background:linear-gradient(var(--amber),transparent);animation:drop 1.8s var(--ease) infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}40%{transform:scaleY(1);transform-origin:top}60%{transform:scaleY(1);transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
.cta{display:inline-flex;margin-top:38px;padding:17px 38px;border-radius:44px;background:linear-gradient(90deg,var(--amber),var(--amber-2));color:#0a0a0a;font-family:var(--font-display);letter-spacing:.2em;font-size:13px;font-weight:500;transition:transform .4s var(--ease),box-shadow .4s;box-shadow:0 10px 40px rgba(255,122,69,.25)}
.cta:hover{transform:translateY(-3px);box-shadow:0 16px 50px rgba(255,122,69,.45)}

/* ---------- 主角模型切换器 ---------- */
.modelbar{
  position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(14px);z-index:62;
  display:flex;align-items:center;gap:14px;padding:10px 16px;border-radius:40px;
  background:rgba(6,11,24,.55);border:1px solid rgba(255,255,255,.1);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  opacity:0;visibility:hidden;transition:opacity .8s var(--ease),transform .8s var(--ease),visibility .8s;
}
.modelbar.is-in{opacity:1;visibility:visible;transform:translateX(-50%)}
.modelbar__label{font-family:var(--font-display);font-size:10px;letter-spacing:.24em;color:var(--muted);padding-left:4px}
.modelbar__list{display:flex;gap:6px}
.mbtn{
  background:none;border:1px solid transparent;color:var(--muted);border-radius:24px;
  font-family:var(--font-display);font-size:11px;letter-spacing:.14em;padding:7px 13px;
  transition:color .3s,background .3s,border-color .3s,box-shadow .3s;position:relative;
}
.mbtn:hover{color:var(--ink)}
.mbtn.is-active{
  color:#0a0a0a;background:linear-gradient(90deg,var(--amber),var(--amber-2));
  box-shadow:0 4px 18px rgba(255,122,69,.35);
}
.mbtn.is-loading{color:var(--ink);border-color:rgba(255,255,255,.25)}
.mbtn.is-loading::after{
  content:"";position:absolute;left:50%;bottom:2px;width:24px;height:1.5px;margin-left:-12px;
  background:linear-gradient(90deg,transparent,var(--amber-2),transparent);
  animation:mload 1s linear infinite;border-radius:2px;
}
@keyframes mload{0%{transform:translateX(-10px);opacity:.3}50%{transform:none;opacity:1}100%{transform:translateX(10px);opacity:.3}}
.mbtn.is-error{animation:mshake .4s var(--ease);color:#ff6b6b}
@keyframes mshake{0%,100%{transform:none}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}

/* ---------- 主角动作面板（复用 modelbar 外观） ---------- */
.actionbar{bottom:76px;padding:8px 14px}
.actionbar.is-empty{display:none}
.mbtn--sm{font-size:10px;padding:6px 11px;letter-spacing:.12em}
.actionbar .modelbar__list{max-width:min(72vw,560px);overflow-x:auto;scrollbar-width:none}
.actionbar .modelbar__list::-webkit-scrollbar{display:none}

@media (max-width:720px){
  .modelbar{bottom:14px;padding:8px 12px;gap:8px;max-width:94vw;overflow-x:auto}
  .actionbar{bottom:66px}
  .modelbar__label{display:none}
}

/* reveal 初始态（由 JS 逐条揭示） */
.reveal{opacity:0;transform:translateY(30px)}

.badge{position:fixed;left:clamp(20px,4vw,54px);bottom:20px;z-index:60;font-family:var(--font-display);font-size:10px;letter-spacing:.14em;color:rgba(142,160,196,.55)}

@media (max-width:720px){
  .chapter__inner,.chapter__inner.right{text-align:center;margin:0 auto}
  .lede,.chapter__inner.right .lede{margin-left:auto;margin-right:auto}
  .badge{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important}
}

/* ===================== 演示级增强 ===================== */
/* 科技感 HUD */
.hud{position:fixed;inset:0;z-index:58;pointer-events:none;opacity:0;transition:opacity 1s var(--ease);font-family:var(--font-display);color:rgba(180,210,255,.7)}
.hud.is-in{opacity:1}
.hud__corner{position:fixed;width:26px;height:26px;border:1.5px solid rgba(120,180,255,.35)}
.hud__corner--tl{top:16px;left:16px;border-right:0;border-bottom:0}
.hud__corner--tr{top:16px;right:16px;border-left:0;border-bottom:0}
.hud__corner--bl{bottom:16px;left:16px;border-right:0;border-top:0}
.hud__corner--br{bottom:16px;right:16px;border-left:0;border-top:0}
.hud__box{position:fixed;font-size:9.5px;letter-spacing:.16em;line-height:1.9;text-shadow:0 0 8px rgba(90,150,255,.4)}
.hud__box i{display:inline-block;width:58px;color:rgba(120,150,200,.55);font-style:normal}
.hud__box b{color:rgba(210,230,255,.92);font-weight:500}
.hud__box--tl{top:30px;left:34px}
.hud__box--tr{top:30px;right:34px;text-align:right}
.hud__box--tr i{width:auto;margin-right:8px}
.hud__box--bl{bottom:30px;left:34px}
.hud__box--br{bottom:30px;right:34px}
.hud__rec{display:inline-block;width:7px;height:7px;border-radius:50%;background:#ff5a4d;margin-right:6px;vertical-align:middle;box-shadow:0 0 8px #ff5a4d;animation:hudrec 1.4s steps(1) infinite}
@keyframes hudrec{0%,60%{opacity:1}61%,100%{opacity:.25}}
.hud__scan{position:fixed;inset:0;pointer-events:none;overflow:hidden;background:repeating-linear-gradient(180deg,rgba(120,180,255,.035) 0,rgba(120,180,255,.035) 1px,transparent 2px,transparent 4px);mix-blend-mode:screen}
.hud__scan::after{content:"";position:absolute;left:0;right:0;height:140px;top:-140px;background:linear-gradient(180deg,transparent,rgba(120,180,255,.07),transparent);animation:hudsweep 6s linear infinite}
@keyframes hudsweep{0%{top:-140px}100%{top:100%}}
@media (max-width:720px){ .hud__box{font-size:8px} .hud__box--bl,.hud__box--br{display:none} }

/* 爆发闪白 */
.flash{position:fixed;inset:0;z-index:105;pointer-events:none;background:#fff;opacity:0;mix-blend-mode:screen}

/* 曲速径向速度线 */
.warpfx{position:fixed;inset:0;z-index:3;pointer-events:none;opacity:0;
  background:repeating-radial-gradient(circle at 50% 46%, transparent 0 3px, rgba(150,200,255,.05) 3px 4px);
  mix-blend-mode:screen;transition:opacity .2s linear}

/* 磁吸 CTA */
.cta{will-change:transform}