/* ==========================================================
   手势火星画板 — 视觉系统
   主题：夜 · 烛火（深空底色 + 烛火光强调）
   ========================================================== */

:root{
  --ink-0:#05070b;
  --ink-1:#0a0e15;
  --ink-2:#111825;
  --ink-3:#1a2434;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);

  --text-0:#f2f5fa;
  --text-1:#a9b6c9;
  --text-2:#67748a;

  --flame:#ffb454;          /* 烛火光 · 主强调 */
  --flame-soft:rgba(255,180,84,.16);
  --cyan:#38e1ff;           /* 骨架青 */
  --cyan-soft:rgba(56,225,255,.16);
  --mint:#5ee7a0;
  --rose:#ff4d6d;

  --r-lg:20px;
  --r-md:13px;
  --r-sm:9px;

  --shadow:0 24px 60px -18px rgba(0,0,0,.85);
  --glass:rgba(14,19,28,.72);
  --blur:blur(22px) saturate(150%);
}

*{box-sizing:border-box;margin:0;padding:0}

html,body{height:100%;overflow:hidden}

body{
  background:var(--ink-0);
  color:var(--text-0);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
  user-select:none;
  cursor:default;
}

/* 全局环境光 —— 让纯黑有层次 */
body::before{
  content:"";
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(900px 620px at 18% -10%, rgba(255,180,84,.09), transparent 62%),
    radial-gradient(760px 560px at 88% 108%, rgba(56,225,255,.075), transparent 60%),
    radial-gradient(1200px 800px at 50% 50%, #0b1018 0%, #05070b 78%);
}

/* ================= 舞台 ================= */
#stage{position:fixed;inset:0;z-index:1}

#stage canvas{
  position:absolute;inset:0;
  width:100%;height:100%;
  display:block;
}
#bgLayer{z-index:1}
#artLayer{z-index:2}
#fxLayer{z-index:3;pointer-events:none}

/* 暗角，把注意力收进画面中心 */
#vignette{
  position:absolute;inset:0;z-index:4;pointer-events:none;
  background:radial-gradient(120% 95% at 50% 50%, transparent 42%, rgba(0,0,0,.55) 100%);
  mix-blend-mode:multiply;
}

/* 极细扫描线，增加"仪器感" */
#scanline{
  position:absolute;inset:0;z-index:5;pointer-events:none;
  opacity:.16;
  background:repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,.05) 0 1px,
    transparent 1px 3px
  );
}

/* ================= 顶部状态栏 ================= */
#topbar{
  position:fixed;top:0;left:0;right:0;z-index:20;
  display:flex;align-items:center;gap:18px;
  padding:16px 20px;
  pointer-events:none;
}
#topbar > *{pointer-events:auto}

.brand{
  display:flex;align-items:center;gap:9px;
  padding:9px 15px 9px 12px;
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  box-shadow:0 8px 24px -12px rgba(0,0,0,.9);
}
.brand-dot{
  width:9px;height:9px;border-radius:50%;
  background:var(--flame);
  box-shadow:0 0 12px 2px rgba(255,180,84,.75);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.55;transform:scale(.82)}
}
.brand-name{font-size:13.5px;font-weight:600;letter-spacing:.03em}

/* 状态药丸 */
.status-pill{
  display:flex;align-items:center;gap:11px;
  padding:8px 16px 8px 13px;
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  border-radius:999px;
  box-shadow:0 8px 24px -12px rgba(0,0,0,.9);
  transition:border-color .3s, box-shadow .3s;
  min-width:230px;
}
.status-led{
  width:10px;height:10px;border-radius:50%;
  background:var(--text-2);
  transition:background .25s, box-shadow .25s;
  flex:none;
}
.status-text{font-size:13px;font-weight:600;letter-spacing:.02em;white-space:nowrap}
.status-sub{
  font-size:11.5px;color:var(--text-2);white-space:nowrap;
  border-left:1px solid var(--line);padding-left:11px;margin-left:1px;
}

.status-pill[data-mode="show"]{border-color:rgba(56,225,255,.42);box-shadow:0 0 26px -6px rgba(56,225,255,.4)}
.status-pill[data-mode="show"] .status-led{background:var(--cyan);box-shadow:0 0 14px 2px rgba(56,225,255,.85)}
.status-pill[data-mode="draw"]{border-color:rgba(255,180,84,.5);box-shadow:0 0 30px -6px rgba(255,180,84,.5)}
.status-pill[data-mode="draw"] .status-led{background:var(--flame);box-shadow:0 0 16px 3px rgba(255,180,84,.95)}
.status-pill[data-mode="grab"]{border-color:rgba(94,231,160,.45);box-shadow:0 0 26px -6px rgba(94,231,160,.45)}
.status-pill[data-mode="grab"] .status-led{background:var(--mint);box-shadow:0 0 14px 2px rgba(94,231,160,.85)}

/* 指标 */
.metrics{
  margin-left:auto;display:flex;gap:1px;
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  box-shadow:0 8px 24px -12px rgba(0,0,0,.9);
}
.metric{
  display:flex;flex-direction:column;align-items:center;gap:1px;
  padding:7px 15px;min-width:62px;
}
.metric + .metric{border-left:1px solid var(--line)}
.metric b{
  font:600 14px/1.1 ui-monospace,"SF Mono",Menlo,monospace;
  color:var(--text-0);
  font-variant-numeric:tabular-nums;
}
.metric i{font-style:normal;font-size:10px;color:var(--text-2);letter-spacing:.08em}

/* ================= 右侧工具条 ================= */
#toolbar{
  position:fixed;right:20px;top:50%;transform:translateY(-50%);
  z-index:20;
  display:flex;flex-direction:column;gap:5px;
  padding:9px;
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow);
}
.tool{
  display:flex;flex-direction:column;align-items:center;gap:5px;
  width:60px;padding:10px 4px 8px;
  background:transparent;border:0;border-radius:var(--r-md);
  color:var(--text-1);
  font-family:inherit;font-size:10.5px;font-weight:500;letter-spacing:.03em;
  cursor:pointer;
  transition:background .18s, color .18s, transform .18s;
}
.tool svg{
  width:21px;height:21px;
  stroke:currentColor;stroke-width:1.6;
  stroke-linecap:round;stroke-linejoin:round;fill:none;
}
.tool:hover{background:rgba(255,255,255,.06);color:var(--text-0)}
.tool:active{transform:scale(.94)}
.tool.toggle.off{color:var(--text-2);opacity:.5}
.tool.toggle.on{color:var(--text-0)}
.tool.toggle.on svg{filter:drop-shadow(0 0 7px currentColor)}
#btnSkeleton.on{color:var(--cyan)}
#btnSpark.on{color:var(--flame)}
#btnCam.on{color:var(--text-0)}
#btnAudio.on{color:var(--mint)}
#btnAudio.on svg{filter:drop-shadow(0 0 7px var(--mint))}
.tool-sep{height:1px;background:var(--line);margin:3px 9px}

/* ================= 底部图例 ================= */
#legend{
  position:fixed;left:50%;bottom:18px;transform:translateX(-50%);
  z-index:20;
  display:flex;gap:5px;align-items:stretch;
  padding:9px;
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow);
  transition:opacity .4s;
}
#legend.hide{opacity:0;pointer-events:none;transform:translateX(-50%) translateY(12px)}

.lg{
  display:flex;align-items:center;gap:11px;
  padding:9px 14px;border-radius:var(--r-md);
  color:var(--text-1);
  border:1px solid transparent;
  transition:border-color .3s, background .3s, color .3s;
}
.lg svg{width:34px;height:34px;flex:none;opacity:.8}
.lg-txt{display:flex;flex-direction:column;gap:2px;line-height:1.25}
.lg-txt b{font-size:12px;font-weight:600;color:var(--text-0);white-space:nowrap}
.lg-txt i{font-style:normal;font-size:10.5px;color:var(--text-2);white-space:nowrap}

/* 当前生效的手势卡片高亮 */
#legend[data-active="show"] .lg[data-mode="show"],
#legend[data-active="draw"] .lg[data-mode="draw"],
#legend[data-active="grab"] .lg[data-mode="grab"]{
  border-color:rgba(255,180,84,.35);
  background:var(--flame-soft);
}
#legend[data-active="show"] .lg[data-mode="show"] svg{color:var(--cyan);opacity:1}
#legend[data-active="draw"] .lg[data-mode="draw"] svg{color:var(--flame);opacity:1}
#legend[data-active="grab"] .lg[data-mode="grab"] svg{color:var(--mint);opacity:1}
#legend[data-active="show"] .lg[data-mode="show"] .lg-txt b{color:var(--cyan)}
#legend[data-active="draw"] .lg[data-mode="draw"] .lg-txt b{color:var(--flame)}
#legend[data-active="grab"] .lg[data-mode="grab"] .lg-txt b{color:var(--mint)}

.lg.tip{padding-right:16px}
.lg.tip .lg-txt b{color:var(--text-1)}

/* ================= 启动遮罩 ================= */
#splash{
  position:fixed;inset:0;z-index:60;
  display:grid;place-items:center;
  background:radial-gradient(900px 700px at 50% 40%, rgba(20,26,38,.9), rgba(3,5,8,.97));
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  transition:opacity .55s cubic-bezier(.4,0,.2,1), visibility .55s;
}
#splash.gone{opacity:0;visibility:hidden;pointer-events:none}

.splash-card{
  position:relative;
  width:min(560px, calc(100vw - 48px));
  padding:40px 42px 32px;
  background:linear-gradient(180deg, rgba(23,30,43,.9), rgba(11,15,22,.94));
  border:1px solid var(--line-2);
  border-radius:26px;
  box-shadow:0 40px 100px -30px #000, inset 0 1px 0 rgba(255,255,255,.06);
  text-align:center;
  overflow:hidden;
}
.splash-glow{
  position:absolute;top:-140px;left:50%;transform:translateX(-50%);
  width:420px;height:300px;
  background:radial-gradient(closest-side, rgba(255,180,84,.32), transparent 72%);
  pointer-events:none;
  animation:breathe 5s ease-in-out infinite;
}
@keyframes breathe{
  0%,100%{opacity:.7;transform:translateX(-50%) scale(1)}
  50%{opacity:1;transform:translateX(-50%) scale(1.14)}
}
.splash-eyebrow{
  position:relative;
  font:600 10px/1 ui-monospace,"SF Mono",Menlo,monospace;
  letter-spacing:.24em;color:var(--flame);opacity:.85;
  margin-bottom:16px;
}
.splash-card h1{
  position:relative;
  font-size:36px;font-weight:700;letter-spacing:.01em;line-height:1.12;
}
.splash-card h1 span{
  background:linear-gradient(100deg,#ffb454,#ff7a45 55%,#ffd98a);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.splash-sub{
  position:relative;
  margin-top:13px;font-size:13.5px;line-height:1.65;color:var(--text-1);
}

.splash-steps{
  position:relative;
  margin:28px 0 26px;
  display:flex;flex-direction:column;gap:9px;text-align:left;
}
.step{
  display:flex;gap:13px;align-items:flex-start;
  padding:12px 15px;
  background:rgba(255,255,255,.032);
  border:1px solid var(--line);
  border-radius:var(--r-md);
}
.step-no{
  font:600 11px/1 ui-monospace,"SF Mono",Menlo,monospace;
  color:var(--flame);padding-top:3px;opacity:.9;letter-spacing:.06em;
}
.step-body{display:flex;flex-direction:column;gap:3px}
.step-body b{font-size:13px;font-weight:600}
.step-body span{font-size:11.5px;color:var(--text-2);line-height:1.5}

#btnStart{
  position:relative;
  width:100%;padding:15px;
  background:linear-gradient(180deg,#ffc271,#ff9f33);
  color:#1a1005;
  border:0;border-radius:var(--r-md);
  font-family:inherit;font-size:14px;font-weight:700;letter-spacing:.03em;
  cursor:pointer;
  box-shadow:0 14px 34px -12px rgba(255,159,51,.75), inset 0 1px 0 rgba(255,255,255,.5);
  transition:transform .16s, box-shadow .16s, filter .16s;
}
#btnStart:hover{transform:translateY(-1px);filter:brightness(1.05);box-shadow:0 20px 42px -12px rgba(255,159,51,.9)}
#btnStart:active{transform:translateY(1px) scale(.995)}
#btnStart:disabled{opacity:.6;cursor:progress;transform:none}

.splash-foot{
  position:relative;
  margin-top:15px;font-size:11px;line-height:1.6;color:var(--text-2);
}
.splash-foot.err{color:var(--rose);font-weight:500}

/* ================= 帮助浮层 ================= */
#helpSheet{
  position:fixed;inset:0;z-index:70;
  display:grid;place-items:center;
  background:rgba(3,5,8,.72);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  opacity:0;visibility:hidden;
  transition:opacity .32s, visibility .32s;
}
#helpSheet.open{opacity:1;visibility:visible}
.help-inner{
  width:min(520px, calc(100vw - 48px));
  max-height:82vh;overflow:auto;
  padding:32px 34px;
  background:linear-gradient(180deg, rgba(23,30,43,.96), rgba(11,15,22,.98));
  border:1px solid var(--line-2);
  border-radius:22px;
  box-shadow:var(--shadow);
}
.help-inner h2{
  font-size:13px;font-weight:600;color:var(--flame);
  letter-spacing:.06em;margin-bottom:12px;
}
.help-inner h2:not(:first-child){margin-top:24px}
.help-inner table{width:100%;border-collapse:collapse}
.help-inner td{
  padding:10px 0;
  font-size:12.5px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.help-inner td:first-child{
  width:130px;color:var(--text-0);font-weight:600;padding-right:14px;
}
.help-inner td:last-child{color:var(--text-1);line-height:1.58}
.help-inner code{
  font:500 11.5px/1 ui-monospace,"SF Mono",Menlo,monospace;
  background:rgba(255,255,255,.07);padding:2px 6px;border-radius:5px;
}
#btnHelpClose{
  width:100%;margin-top:26px;padding:13px;
  background:rgba(255,255,255,.07);
  border:1px solid var(--line-2);border-radius:var(--r-md);
  color:var(--text-0);font-family:inherit;font-size:13px;font-weight:600;
  cursor:pointer;transition:background .18s;
}
#btnHelpClose:hover{background:rgba(255,255,255,.12)}

/* ================= 音效设置浮层 ================= */
#audioSheet{
  position:fixed;inset:0;z-index:70;
  display:grid;place-items:center;
  background:rgba(3,5,8,.72);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  opacity:0;visibility:hidden;
  transition:opacity .32s, visibility .32s;
}
#audioSheet.open{opacity:1;visibility:visible}
.audio-inner{
  width:min(460px, calc(100vw - 48px));
  max-height:84vh;overflow:auto;
  padding:28px 30px 26px;
  background:linear-gradient(180deg, rgba(23,30,43,.96), rgba(11,15,22,.98));
  border:1px solid var(--line-2);
  border-radius:22px;
  box-shadow:var(--shadow);
}
.audio-inner h2{
  font-size:13px;font-weight:600;color:var(--mint);
  letter-spacing:.06em;margin-bottom:13px;
}
.audio-inner h2:not(:first-child){margin-top:22px}

/* 设置行 */
.set-row{
  display:flex;align-items:center;gap:12px;
  padding:11px 13px;margin-bottom:9px;
  background:rgba(255,255,255,.032);
  border:1px solid var(--line);
  border-radius:var(--r-md);
}
.set-label{flex:1;font-size:12.5px;color:var(--text-0);font-weight:500}
.set-label em{font-style:normal;color:var(--text-2);font-size:10.5px;margin-left:2px}
.set-val{
  width:34px;text-align:right;
  font:600 12px/1 ui-monospace,"SF Mono",Menlo,monospace;
  color:var(--text-1);font-variant-numeric:tabular-nums;
}

/* 开关 */
.switch{
  position:relative;flex:none;
  width:46px;height:26px;border-radius:999px;
  background:rgba(255,255,255,.12);
  border:1px solid var(--line-2);
  cursor:pointer;transition:background .2s, border-color .2s;
  padding:0;
}
.switch .knob{
  position:absolute;top:2px;left:2px;
  width:20px;height:20px;border-radius:50%;
  background:var(--text-1);
  transition:transform .2s, background .2s;
}
.switch.on{background:rgba(94,231,160,.32);border-color:rgba(94,231,160,.5)}
.switch.on .knob{transform:translateX(20px);background:var(--mint);box-shadow:0 0 10px rgba(94,231,160,.85)}

/* 音量滑块 */
.slider{
  -webkit-appearance:none;appearance:none;
  flex:1;height:4px;border-radius:999px;
  background:linear-gradient(90deg, var(--mint) 0%, var(--mint) 70%, rgba(255,255,255,.14) 70%);
  outline:none;cursor:pointer;
}
.slider::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:16px;height:16px;border-radius:50%;
  background:#fff;box-shadow:0 0 8px rgba(94,231,160,.7);
  cursor:pointer;
}
.slider::-moz-range-thumb{
  width:16px;height:16px;border:0;border-radius:50%;
  background:#fff;box-shadow:0 0 8px rgba(94,231,160,.7);cursor:pointer;
}

/* 音色列表 */
.preset-list{display:flex;flex-direction:column;gap:8px}
.preset-row{
  display:flex;align-items:center;gap:12px;
  padding:11px 13px;border-radius:var(--r-md);
  background:rgba(255,255,255,.03);
  border:1px solid var(--line);
  cursor:pointer;
  transition:border-color .2s, background .2s;
}
.preset-row:hover{background:rgba(255,255,255,.06)}
.preset-row.selected{
  border-color:rgba(94,231,160,.5);
  background:rgba(94,231,160,.1);
  box-shadow:0 0 22px -8px rgba(94,231,160,.55);
}
.preset-meta{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}
.preset-meta b{font-size:13px;font-weight:600;color:var(--text-0)}
.preset-meta i{font-style:normal;font-size:10.5px;color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.try{
  flex:none;
  padding:6px 13px;border-radius:999px;
  background:rgba(255,255,255,.08);
  border:1px solid var(--line-2);
  color:var(--text-1);
  font-family:inherit;font-size:11px;font-weight:600;letter-spacing:.04em;
  cursor:pointer;transition:background .18s, color .18s, transform .12s;
}
.try:hover{background:var(--mint-soft, rgba(94,231,160,.16));color:var(--text-0)}
.try:active{transform:scale(.93)}

#btnAudioClose{
  width:100%;margin-top:24px;padding:13px;
  background:linear-gradient(180deg,#ffc271,#ff9f33);
  border:0;border-radius:var(--r-md);
  color:#1a1005;font-family:inherit;font-size:13px;font-weight:700;letter-spacing:.03em;
  cursor:pointer;transition:transform .16s, filter .16s;
}
#btnAudioClose:hover{transform:translateY(-1px);filter:brightness(1.05)}

/* ================= 窄屏适配 ================= */
@media (max-width:1180px){
  .metrics{display:none}
  .lg.tip{display:none}
}
@media (max-width:880px){
  .status-sub{display:none}
  .status-pill{min-width:0}
  #legend .lg{padding:8px 10px;gap:8px}
  #legend .lg svg{width:28px;height:28px}
  #legend .lg-txt i{display:none}
  #toolbar{right:12px;padding:7px}
  .tool{width:50px}
}

/* 品牌区作为链接（返回产品页） */
a.brand{text-decoration:none;cursor:pointer;transition:border-color .2s, box-shadow .2s}
a.brand:hover{border-color:var(--flame);box-shadow:0 0 22px -8px rgba(255,180,84,.5)}