:root {
  --bg: #050506;
  --fg: #f2f2f4;
  --dim: rgba(242, 242, 244, 0.40);
  --dim2: rgba(242, 242, 244, 0.22);
  --line: rgba(255, 255, 255, 0.13);
  --accent: #cfe0ff;
  --sans: "Helvetica Neue", "Inter", ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  overflow: hidden;
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  cursor: none;
}

body.loading { cursor: progress; }

canvas#gl {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

canvas#handLayer {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 3;
  pointer-events: none;
  mix-blend-mode: screen;
}

video#cam {
  position: fixed;
  width: 2px;
  height: 2px;
  opacity: 0;
  pointer-events: none;
  top: 0;
  left: 0;
}

/* ---------------- cursor ---------------- */
#cursor {
  position: fixed;
  top: 0;
  left: 0;
  width: 26px;
  height: 26px;
  margin: -13px 0 0 -13px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  pointer-events: none;
  z-index: 120;
  mix-blend-mode: difference;
  transition: width .18s ease, height .18s ease, margin .18s ease, border-color .18s ease, opacity .3s;
  will-change: transform;
}
#cursor i {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 3px;
  height: 3px;
  margin: -1.5px 0 0 -1.5px;
  border-radius: 50%;
  background: #fff;
}
#cursor.drag {
  width: 62px;
  height: 62px;
  margin: -31px 0 0 -31px;
  border-color: rgba(255, 255, 255, 0.85);
}
#cursor.hide { opacity: 0; }

/* ---------------- hud ---------------- */
.hud {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .85s cubic-bezier(.22,.8,.3,1), transform .85s cubic-bezier(.22,.8,.3,1);
}
body.ready .hud { opacity: 1; transform: translateY(0); }

.tl { top: 26px; left: 30px; transition-delay: .10s; }
.tr { top: 24px; right: 28px; display: flex; gap: 8px; transition-delay: .20s; }
.bl { bottom: 26px; left: 30px; transition-delay: .30s; }
.br { bottom: 26px; right: 30px; text-align: right; transition-delay: .40s; }

h1 {
  font-size: 27px;
  font-weight: 300;
  letter-spacing: .30em;
  line-height: 1;
  margin-left: -2px;
}
h1 i { font-style: normal; color: var(--dim2); }

.hud p {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .18em;
  color: var(--dim);
  text-transform: uppercase;
}

/* ---------------- buttons ---------------- */
.btn {
  pointer-events: auto;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(242, 242, 244, 0.56);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.17);
  padding: 9px 13px;
  cursor: none;
  transition: color .2s, border-color .2s, background .2s;
  backdrop-filter: blur(6px);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}
.btn:hover { color: var(--fg); border-color: rgba(255, 255, 255, 0.38); background: rgba(255, 255, 255, 0.06); }
.btn:active { background: rgba(255, 255, 255, 0.12); }
.btn.on { color: #06070a; background: var(--fg); border-color: var(--fg); }
.btn b { font-weight: 400; color: var(--dim2); }
.btn.on b { color: rgba(0,0,0,.45); }

.btn .dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: #4a4a52;
  transition: background .25s, box-shadow .25s;
}
.btn .dot.live { background: #7dffc4; box-shadow: 0 0 8px #7dffc4; }

/* ---------------- modes ---------------- */
.modes {
  position: fixed;
  z-index: 10;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  opacity: 0;
  transform: translate(-50%, 10px);
  transition: opacity .85s cubic-bezier(.22,.8,.3,1), transform .85s cubic-bezier(.22,.8,.3,1);
  transition-delay: .45s;
}
body.ready .modes { opacity: 1; transform: translate(-50%, 0); }

.modes button {
  pointer-events: auto;
  position: relative;
  background: none;
  border: none;
  cursor: none;
  padding: 8px 18px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--dim2);
  transition: color .25s;
  font-family: var(--sans);
}
.modes button::after {
  content: "";
  position: absolute;
  left: 18px; right: 18px; bottom: 0;
  height: 1px;
  background: var(--fg);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s cubic-bezier(.22,.8,.3,1);
}
.modes button:hover { color: var(--dim); }
.modes button em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .2em;
  opacity: .7;
}
.modes button span {
  font-size: 12.5px;
  letter-spacing: .16em;
}
.modes button small {
  font-family: var(--mono);
  font-size: 7.5px;
  letter-spacing: .22em;
  opacity: .55;
}
.modes button.on { color: var(--fg); }
.modes button.on::after { transform: scaleX(1); }

/* ---------------- status ---------------- */
.status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .16em;
  color: var(--dim);
  text-transform: uppercase;
}
.status .sep { color: var(--dim2); opacity: .5; }
#stMode { color: var(--accent); }

.tip {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .09em;
  line-height: 1.95;
  color: rgba(242, 242, 244, 0.42);
  max-width: 320px;
}
kbd {
  font-family: var(--mono);
  font-size: 8.5px;
  border: 1px solid var(--line);
  padding: 1px 4px;
  border-radius: 2px;
  color: var(--dim);
}

/* ---------------- 手势引导 ---------------- */
.coach {
  position: fixed;
  z-index: 10;
  left: 30px;
  top: 50%;
  width: 170px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-50%) translateX(-10px);
  transition: opacity .9s cubic-bezier(.22,.8,.3,1) .55s,
              transform .9s cubic-bezier(.22,.8,.3,1) .55s;
}
body.ready .coach { opacity: 1; transform: translateY(-50%) translateX(0); }
body.clean .coach { opacity: 0 !important; }

.coach-head {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .22em;
  color: var(--dim2);
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.coach .row {
  position: relative;
  display: grid;
  grid-template-columns: 17px 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 7px 0;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: rgba(242, 242, 244, 0.42);
  transition: color .3s;
}
.coach .row em { font-style: normal; font-size: 7.5px; opacity: .55; }
.coach .row small { font-size: 7.5px; letter-spacing: .15em; opacity: .45; }
.coach .row::before {
  content: "";
  position: absolute;
  left: -13px;
  top: 50%;
  width: 1px;
  height: 0;
  background: var(--accent);
  transform: translateY(-50%);
  transition: height .32s cubic-bezier(.22,.8,.3,1);
}
.coach .row.used { color: rgba(242, 242, 244, 0.58); }
.coach .row.live { color: var(--fg); }
.coach .row.live::before { height: 15px; }
.coach .row.live small { color: var(--accent); opacity: .95; }

.coach-engine {
  margin-top: 12px;
  padding-top: 9px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .16em;
  color: rgba(242, 242, 244, 0.30);
  transition: color .3s;
}
.coach-engine.ok { color: rgba(160, 226, 182, 0.85); }
.coach-engine.bad { color: rgba(255, 155, 138, 0.9); }

.coach-foot {
  margin-top: 11px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.9;
  letter-spacing: .05em;
  color: var(--dim2);
}

.status b { font-weight: 400; color: var(--fg); }

/* ---------------- panel ---------------- */
.panel {
  position: fixed;
  z-index: 20;
  top: 0; right: 0;
  width: 326px;
  height: 100%;
  background: rgba(7, 7, 10, 0.78);
  backdrop-filter: blur(22px) saturate(120%);
  border-left: 1px solid var(--line);
  transform: translateX(102%);
  transition: transform .48s cubic-bezier(.22,.8,.3,1);
  display: flex;
  flex-direction: column;
}
.panel.open { transform: translateX(0); }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 22px 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  color: var(--dim);
}
.panel-head button {
  background: none; border: none; color: var(--dim);
  font-size: 18px; line-height: 1; cursor: none; padding: 0 4px;
  transition: color .2s;
}
.panel-head button:hover { color: var(--fg); }

.panel-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 0;
}
.panel-body::-webkit-scrollbar { width: 3px; }
.panel-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,.16); }

.layer {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 22px;
  gap: 12px;
  align-items: center;
  padding: 11px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background .2s;
}
.layer:hover { background: rgba(255, 255, 255, 0.035); }
.layer .thumb {
  width: 52px; height: 30px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #0b0b10;
  display: block;
}
.layer .meta { min-width: 0; }
.layer .name {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .1em;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 7px;
  text-transform: uppercase;
}
.layer .name small { color: var(--dim2); margin-left: 6px; font-size: 8px; }
.layer .row { display: flex; align-items: center; gap: 8px; }
.layer .row span {
  font-family: var(--mono);
  font-size: 8px;
  color: var(--dim2);
  width: 26px;
  letter-spacing: .06em;
}
.layer input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  min-width: 0;
  height: 14px;
  background: transparent;
  cursor: none;
}
.layer input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.22);
}
.layer input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px; height: 10px;
  margin-top: -4px;
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(180, 210, 255, 0.55);
}
.layer input[type="range"]::-moz-range-track {
  height: 2px; background: rgba(255, 255, 255, 0.22);
}
.layer input[type="range"]::-moz-range-thumb {
  width: 10px; height: 10px; border: none; border-radius: 50%; background: #fff;
}
.layer .del {
  position: relative;
  background: none; border: none; color: rgba(242, 242, 244, 0.38);
  width: 22px; height: 22px; cursor: none; padding: 0;
  transition: color .2s;
  line-height: 1;
}
.layer .del::before, .layer .del::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 9px; height: 1px;
  background: currentColor;
  transform: translate(-50%, -50%) rotate(45deg);
}
.layer .del::after { transform: translate(-50%, -50%) rotate(-45deg); }
.layer .del:hover { color: #ff7d7d; }
.layer .lock {
  color: var(--dim2); font-size: 12px; text-align: center;
  width: 22px; height: 22px; line-height: 20px;
  display: block; background: none; border: none; padding: 0;
}

.panel-foot {
  padding: 16px 22px 22px;
  border-top: 1px solid var(--line);
}
.btn.wide { width: 100%; justify-content: center; }
.panel-foot .hint {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 8.5px;
  line-height: 1.8;
  letter-spacing: .08em;
  color: var(--dim2);
}

/* ---------------- boot ---------------- */
#boot {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: #050506;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity .7s ease, visibility .7s;
}
#boot.done { opacity: 0; visibility: hidden; }
.boot-inner { text-align: center; width: 260px; }
.boot-logo {
  font-size: 38px;
  font-weight: 200;
  letter-spacing: .46em;
  margin-left: .46em;
  margin-bottom: 26px;
  color: var(--fg);
}
.boot-rule {
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}
.boot-rule i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--fg);
  transition: width .5s cubic-bezier(.3,.8,.3,1);
}
.boot-msg {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .2em;
  color: var(--dim);
  text-transform: uppercase;
  min-height: 14px;
}
.boot-msg.err { color: #ff8080; letter-spacing: .06em; text-transform: none; font-size: 10px; line-height: 1.7; }

/* ---------------- toast ---------------- */
#toast {
  position: fixed;
  left: 50%;
  bottom: 108px;
  transform: translate(-50%, 10px);
  z-index: 80;
  background: rgba(12, 12, 16, 0.9);
  border: 1px solid var(--line);
  padding: 10px 16px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .12em;
  color: var(--fg);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s, transform .3s;
  backdrop-filter: blur(10px);
  max-width: 80vw;
  text-align: center;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- camera diagnosis ---------------- */
#camHelp, #notice {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(3, 3, 5, 0.72);
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .28s ease;
}
#camHelp.open, #notice.open { opacity: 1; pointer-events: auto; }

.ch-card {
  width: min(460px, calc(100vw - 40px));
  background: rgba(10, 10, 14, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
  transform: translateY(8px);
  transition: transform .32s cubic-bezier(.22,.8,.3,1);
}
#camHelp.open .ch-card, #notice.open .ch-card { transform: translateY(0); }

.ch-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .2em;
  color: var(--dim);
}
.ch-head button {
  background: none; border: none; color: var(--dim);
  font-size: 16px; line-height: 1; cursor: none; padding: 0 2px;
}
.ch-head button:hover { color: var(--fg); }

.ch-reason {
  padding: 18px 18px 10px;
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: .01em;
  color: #ffd9d0;
}
.ch-reason.ok { color: #bfe8cf; }

.ch-rows {
  padding: 0 18px 4px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .05em;
  line-height: 2.2;
  color: rgba(242, 242, 244, 0.44);
}
.ch-rows .r { display: flex; justify-content: space-between; gap: 12px; }
.ch-rows .r b { font-weight: 400; color: rgba(242, 242, 244, 0.82); }
.ch-rows .r b.bad { color: #ff9b8a; }
.ch-rows .r b.good { color: #9fe2b6; }

.ch-steps {
  margin: 10px 18px 0;
  padding-left: 17px;
  font-size: 12.5px;
  line-height: 1.95;
  color: rgba(242, 242, 244, 0.72);
}
.ch-steps li {
  margin-bottom: 3px;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.ch-steps li::marker { color: rgba(242, 242, 244, 0.34); }
.ch-steps:empty { display: none; }

.ch-acts {
  display: flex;
  gap: 8px;
  padding: 16px 18px 18px;
}
.ch-acts .btn { flex: 1; justify-content: center; }
.ch-acts .btn.ghost { color: var(--dim); background: none; }

body.clean .hud,
body.clean .modes,
body.clean .tip { opacity: 0 !important; animation: none; transition: opacity .4s; }

@media (max-width: 760px) {
  .tl { top: 18px; left: 18px; }
  .tr { top: 16px; right: 16px; gap: 5px; }
  .dot.bad {
  background: #ff8f7d;
  box-shadow: 0 0 8px rgba(255, 110, 90, 0.75);
}
.btn.warn { border-color: rgba(255, 130, 110, 0.45); color: rgba(255, 190, 180, 0.9); }
.tr .btn { padding: 7px 9px; font-size: 8.5px; letter-spacing: .1em; }
  h1 { font-size: 20px; }
  .hud p { font-size: 8px; letter-spacing: .1em; }
  .bl { left: 18px; bottom: 84px; font-size: 8px; }
  .br { display: none; }
  .coach { display: none; }
  .modes { bottom: 18px; gap: 0; }
  .modes button { padding: 6px 10px 9px; }
  .modes button span { font-size: 11px; letter-spacing: .08em; }
  .modes button small { display: none; }
  .panel { width: 100%; }
}