:root{
  --ink:#eaf3ff;
  --dim:#9fb2c9;
  --faint:#6e8399;
  --accent:#9fd8ff;
  --accent2:#6fb6e8;
  --bg:#04070d;
  --stroke:rgba(159,216,255,.16);
  --glass:rgba(8,15,26,.62);
  --sa-t:env(safe-area-inset-top,0px);
  --sa-b:env(safe-area-inset-bottom,0px);
  --sa-l:env(safe-area-inset-left,0px);
  --sa-r:env(safe-area-inset-right,0px);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg)}
html{height:100%;overflow-x:clip;scroll-behavior:smooth}
body{
  min-height:100%;
  color:var(--ink);
  font-family:"PingFang SC","HarmonyOS Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  -webkit-font-smoothing:antialiased;
  overscroll-behavior-y:none;
}
img{display:block}
button{font-family:inherit;color:inherit;border:none;background:none;cursor:pointer}
a{color:inherit;text-decoration:none}

/* ==================== 画布 ==================== */
#sea{
  position:fixed; inset:0;
  width:100vw; height:100vh;
  display:block; z-index:0;
  touch-action:none;
}

/* WebGL 不可用时的静态海面兜底：内容照常可读，不至于一片死黑 */
body.no-webgl #sea{display:none}
body.no-webgl::before{
  content:'';position:fixed;inset:0;z-index:0;
  background:
    radial-gradient(120% 80% at 50% 108%, rgba(24,52,82,.85) 0%, rgba(10,20,34,.6) 42%, transparent 72%),
    linear-gradient(to bottom, #04070d 0%, #071120 38%, #0b1b2e 62%, #0e2438 100%);
}
body.no-webgl #boot{
  background:
    radial-gradient(120% 80% at 50% 108%, rgba(24,52,82,.85) 0%, rgba(10,20,34,.6) 42%, transparent 72%),
    linear-gradient(to bottom, #04070d 0%, #071120 38%, #0b1b2e 62%, #0e2438 100%);
}

/* ==================== 加载 ==================== */
#boot{
  position:fixed; inset:0; z-index:100;
  display:flex; align-items:center; justify-content:center;
  background:var(--bg);
  transition:opacity .7s ease;
}
#boot.gone{opacity:0;pointer-events:none}
.boot-inner{text-align:center}
.boot-title{font-size:26px;font-weight:600;letter-spacing:.24em;text-indent:.24em}
.boot-sub{margin-top:10px;font-size:12px;color:var(--faint);letter-spacing:.14em}
.boot-bar{
  margin:22px auto 0;width:180px;height:2px;
  background:rgba(159,216,255,.14);border-radius:2px;overflow:hidden;
}
.boot-bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .3s ease}

/* ==================== 顶栏 ==================== */
#top{
  position:fixed; z-index:30;
  top:calc(14px + var(--sa-t)); left:calc(16px + var(--sa-l)); right:calc(16px + var(--sa-r));
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  pointer-events:none;
}
#top>*{pointer-events:auto}
.brand{
  display:flex;align-items:center;gap:8px;
  font-size:14px;font-weight:600;letter-spacing:.1em;
  padding:7px 13px;border-radius:11px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.brand img{width:15px;height:15px;opacity:.85;filter:brightness(1.6)}
#nav{
  display:flex;gap:2px;padding:5px;border-radius:11px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
#nav a{
  padding:6px 11px;border-radius:7px;font-size:12px;color:var(--dim);
  transition:color .2s,background .2s;
}
#nav a:hover{color:var(--ink)}
#nav a.on{background:rgba(159,216,255,.16);color:var(--ink)}

/* ---- 自由看海模式 ----
   平时海面被 #scroll 盖住（它要负责滚动叙事），指针事件到不了 canvas，
   OrbitControls 收不到拖拽。进入这个模式后让 #scroll 让出指针事件，
   海面接管手势，页面同时锁滚。 */
body.free-look{overflow:hidden}
body.free-look main,body.free-look #top{pointer-events:none}
body.free-look #sea{touch-action:none;cursor:grab}
body.free-look #sea:active{cursor:grabbing}
body.free-look #freeBar,body.free-look #player{pointer-events:auto}

#freeBar{
  position:fixed;z-index:60;
  top:calc(66px + var(--sa-t));left:50%;transform:translateX(-50%);
  display:flex;align-items:center;gap:11px;
  padding:9px 13px;border-radius:13px;font-size:12px;color:var(--dim);
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  max-width:calc(100vw - 32px);
}
#freeBar[hidden]{display:none}

/* ==================== 章节 ==================== */
main{position:relative;z-index:10}
.ch{
  min-height:100vh;
  display:flex;align-items:center;
  padding:calc(96px + var(--sa-t)) calc(28px + var(--sa-r)) calc(150px + var(--sa-b)) calc(28px + var(--sa-l));
}
.wrap{
  /* .ch 是 flex 容器，flex item 默认按 max-content 定宽，
     不显式约束就会在窄屏撑破视口 */
  width:100%;min-width:0;max-width:560px;
  margin-left:auto;margin-right:auto;
  opacity:0;transform:translateY(24px);
  transition:opacity .9s cubic-bezier(.2,.7,.3,1),transform .9s cubic-bezier(.2,.7,.3,1);
}
.wrap.left{margin-left:max(28px,8vw);margin-right:auto}
.wrap.in{opacity:1;transform:none}

.eyebrow{
  font-size:11px;letter-spacing:.3em;color:var(--accent);
  margin:0 0 14px;text-transform:uppercase;
}
h1{
  font-size:clamp(40px,9vw,78px);line-height:1.02;margin:0;
  font-weight:600;letter-spacing:.06em;
  text-shadow:0 0 40px rgba(159,216,255,.22),0 2px 18px rgba(0,0,0,.5);
}
h2{
  font-size:clamp(28px,5.4vw,46px);line-height:1.16;margin:0 0 20px;
  font-weight:600;letter-spacing:.04em;
}
h3{font-size:14px;margin:0 0 6px;font-weight:600}
.lede{
  font-size:clamp(15px,2.1vw,19px);line-height:1.85;color:var(--dim);
  margin:22px 0 0;
}
.body{
  font-size:14px;line-height:1.95;color:var(--dim);margin:0 0 14px;
  text-shadow:0 1px 12px rgba(0,0,0,.6);
}
.body.dim{color:var(--faint);font-size:13px}
.body strong{color:var(--ink);font-weight:600}
.hint{
  margin-top:18px;font-size:11.5px;color:var(--faint);
  display:flex;align-items:center;gap:7px;
}
.dot{
  width:5px;height:5px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 8px var(--accent);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:.35}50%{opacity:1}}
.fine{
  margin-top:26px;font-size:11.5px;line-height:1.9;color:var(--faint);
  max-width:520px;padding-top:16px;border-top:1px solid var(--stroke);
}
.fine strong{color:var(--dim)}

/* ==================== 开关 ==================== */
.switch{display:inline-flex;align-items:center;gap:9px;cursor:pointer;font-size:13px}
.switch input{width:17px;height:17px;accent-color:var(--accent)}
.switch.big{margin-top:20px;padding:10px 16px;border-radius:12px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}

/* ==================== 卡片 ==================== */
.cards{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}
.card{
  padding:11px 15px;border-radius:12px;min-width:96px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  cursor:pointer;transition:border-color .22s,background .22s,transform .12s;
}
.card:active{transform:scale(.97)}
.card.on{
  background:rgba(159,216,255,.16);
  border-color:rgba(159,216,255,.45);
}
.card b{display:block;font-size:13px;font-weight:600}
.card span{display:block;margin-top:3px;font-size:10.5px;color:var(--faint);line-height:1.5}

.grid{
  display:grid;gap:11px;margin-top:8px;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));width:100%;
}
.cell{
  padding:15px;border-radius:13px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.cell img{width:17px;height:17px;opacity:.8;margin-bottom:9px;filter:brightness(1.6)}
.cell p{margin:0;font-size:11.5px;line-height:1.7;color:var(--faint)}

/* ==================== 下载 ==================== */
.cta{display:flex;flex-wrap:wrap;gap:11px;margin-top:26px}
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 22px;border-radius:13px;font-size:14px;font-weight:500;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform .12s,border-color .2s,background .2s;
}
.btn:active{transform:scale(.97)}
.btn:hover{border-color:rgba(159,216,255,.38)}
.btn img{width:16px;height:16px;filter:brightness(1.7)}
.btn.primary{
  background:linear-gradient(135deg,rgba(159,216,255,.24),rgba(111,182,232,.16));
  border-color:rgba(159,216,255,.45);
}
.btn small{display:block;font-size:10px;color:var(--faint);font-weight:400;margin-top:2px;letter-spacing:.02em}
.btn-wrap{display:flex;flex-direction:column}

/* ==================== 备用地址 ==================== */
.mirror{
  display:flex;align-items:center;gap:9px;flex-wrap:wrap;
  margin-top:16px;padding:10px 13px;border-radius:12px;
  background:rgba(255,255,255,.035);border:1px solid var(--stroke);
  max-width:460px;
}
.ml-lab{font-size:10.5px;color:var(--faint);flex:0 0 auto}
.mirror code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:12px;color:var(--accent);letter-spacing:.02em;
  user-select:all;-webkit-user-select:all;
  word-break:break-all;flex:1 1 auto;min-width:0;
}
.mirror .mini{flex:0 0 auto;padding:5px 11px}

/* ==================== 音频条 ==================== */
#player{
  position:fixed;z-index:40;
  left:50%;transform:translateX(-50%);
  bottom:calc(18px + var(--sa-b));
  display:flex;align-items:center;gap:13px;
  padding:10px 14px;border-radius:16px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  max-width:calc(100vw - 32px);
}
.round{
  width:38px;height:38px;border-radius:50%;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;
  background:rgba(159,216,255,.14);border:1px solid var(--stroke);
  transition:transform .12s,background .2s;
}
.round:active{transform:scale(.93)}
.round:hover{background:rgba(159,216,255,.22)}
.round img{width:16px;height:16px;filter:brightness(1.8)}
.round.alt{width:33px;height:33px}
.round.alt img{width:14px;height:14px}
.filebtn{
  width:33px;height:33px;border-radius:50%;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  background:rgba(255,255,255,.05);border:1px solid var(--stroke);
  transition:background .2s;
}
.filebtn:hover{background:rgba(159,216,255,.18)}
.filebtn img{width:14px;height:14px;filter:brightness(1.8)}
.pmeta{min-width:0;max-width:190px}
.ptitle{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.psub{font-size:10.5px;color:var(--faint);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pmeters{display:flex;gap:3px;align-items:flex-end;height:26px}
.pmeters i{
  display:block;width:4px;height:2px;border-radius:2px;
  background:linear-gradient(to top,var(--accent2),var(--accent));
  transition:height .08s linear;min-height:2px;
}

/* ==================== 音效抽屉 ==================== */
#fxPanel{
  position:fixed;z-index:45;
  right:calc(16px + var(--sa-r));
  bottom:calc(78px + var(--sa-b));
  width:min(330px,calc(100vw - 32px));
  padding:13px;border-radius:16px;
  background:var(--glass);border:1px solid var(--stroke);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  max-height:60vh;overflow-y:auto;
  transition:opacity .22s,transform .22s;
}
#fxPanel[aria-hidden="true"]{opacity:0;transform:translateY(10px);pointer-events:none}
.prow{display:flex;align-items:center;gap:9px;margin-top:9px}
.prow:first-child{margin-top:0}
.pt-lab{font-size:11.5px;color:var(--dim);flex:0 0 auto}
.pt-val{font-size:11px;color:var(--accent);width:30px;text-align:right;font-variant-numeric:tabular-nums}
.prow input[type=range]{flex:1;accent-color:var(--accent);min-width:0}
.mini{
  padding:6px 12px;border-radius:9px;font-size:11.5px;color:var(--dim);
  background:rgba(255,255,255,.05);border:1px solid var(--stroke);
}
.mini.x{margin-left:auto;width:26px;height:26px;padding:0;
  display:flex;align-items:center;justify-content:center}
.mini.x img{width:11px;height:11px;filter:brightness(1.8)}
.scenes{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.scene{
  padding:7px 11px;border-radius:9px;font-size:11.5px;color:var(--dim);
  background:rgba(255,255,255,.05);border:1px solid var(--stroke);
  transition:all .2s;
}
.scene.on{background:rgba(159,216,255,.18);border-color:rgba(159,216,255,.45);color:var(--ink)}
.eq{display:flex;gap:5px;margin-top:12px;height:96px;align-items:flex-end}
.eq-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;height:100%}
.eq-slider{
  writing-mode:vertical-lr;-webkit-appearance:slider-vertical;appearance:slider-vertical;
  width:14px;flex:1;background:rgba(255,255,255,.14);border-radius:3px;outline:none;
}
.eq-slider::-webkit-slider-thumb{
  -webkit-appearance:none;width:11px;height:11px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 6px rgba(159,216,255,.5);
}
.eq-hz{font-size:8px;color:var(--faint);white-space:nowrap}
.pn{font-size:10.5px;line-height:1.7;color:var(--faint);margin:11px 2px 0}

/* ==================== 窄屏 ==================== */
@media (max-width:680px){
  #nav{display:none}
  .wrap.left{margin-left:auto}
  .pmeta{max-width:120px}
  .pmeters{display:none}
  #fxPanel{left:calc(16px + var(--sa-l));right:calc(16px + var(--sa-r));width:auto}
  .grid{grid-template-columns:repeat(auto-fit,minmax(130px,1fr))}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .wrap{transition:none}
  .dot{animation:none}
}