:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #16181d;
  --muted: #646b78;
  --line: #e3e6eb;
  --accent: #e8590c;
  --accent-soft: #fff1e8;
  --good: #2f9e44;
  --warn: #e0a100;
  --bad: #d6336c;
  --info: #1c7ed6;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1a1d23;
    --text: #e9ebef;
    --muted: #9aa1ad;
    --line: #2b3039;
    --accent: #ff7a2e;
    --accent-soft: #3a2416;
    --good: #51cf66;
    --warn: #fcc419;
    --bad: #f06595;
    --info: #4dabf7;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .6em; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 10px 20px; background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); }
.brand svg { color: var(--accent); }
#nav { display: flex; gap: 4px; flex-wrap: wrap; }
#nav a, #nav button { padding: 6px 12px; border-radius: 8px; color: var(--muted); background: none; border: 0; font: inherit; cursor: pointer; }
#nav a.active, #nav a:hover, #nav button:hover { background: var(--accent-soft); color: var(--accent); }

main { max-width: 1080px; margin: 0 auto; padding: 24px 16px 48px; }
.foot { text-align: center; color: var(--muted); font-size: .8rem; padding: 0 16px 24px; }
.foot p { margin: 0 0 6px; }
.foot a { color: inherit; }
.loading { color: var(--muted); padding: 40px; text-align: center; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 18px; }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

label { display: block; font-size: .85rem; color: var(--muted); margin-bottom: 4px; }
input, select, textarea {
  width: 100%; padding: 9px 11px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text); font: inherit;
}
textarea { min-height: 70px; }
.field { margin-bottom: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.sm { padding: 5px 10px; font-size: .85rem; font-weight: 500; }
.btn.danger { border-color: var(--bad); background: transparent; color: var(--bad); }
.err { color: var(--bad); margin: 8px 0; }
.tabs { display: flex; gap: 6px; margin-bottom: 16px; }
.tabs button { flex: 1; padding: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--muted); border-radius: 8px; cursor: pointer; font: inherit; }
.tabs button.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.auth { max-width: 440px; margin: 40px auto; }
.code-row { display: flex; gap: 8px; }
.code-row input { flex: 1; }
.code-row .btn { white-space: nowrap; }
.hero { padding: 28px; }
.hero h1 { font-size: 1.8rem; }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: s; padding-left: 34px; position: relative; margin-bottom: 10px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 1px; width: 24px; height: 24px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 700; text-align: center; line-height: 24px; font-size: .85rem; }

video, canvas.frame { width: 100%; max-height: 420px; background: #000; border-radius: 8px; display: block; object-fit: contain; }
.progress { height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.progress > div { height: 100%; background: var(--accent); width: 0; transition: width .2s; }

.stat { padding: 14px; border: 1px solid var(--line); border-radius: 10px; }
.stat .v { font-size: 1.6rem; font-weight: 700; }
.stat .k { color: var(--muted); font-size: .85rem; }

.score-ring { --p: 0; width: 120px; height: 120px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--c, var(--accent)) calc(var(--p) * 1%), var(--line) 0); flex-shrink: 0; }
.score-ring > div { width: 96px; height: 96px; border-radius: 50%; background: var(--card); display: grid; place-items: center; font-size: 2rem; font-weight: 800; }

.phasebar { display: flex; height: 34px; border-radius: 8px; overflow: hidden; margin: 10px 0 4px; font-size: .78rem; color: #fff; }
.phasebar > div { display: flex; align-items: center; justify-content: center; white-space: nowrap; overflow: hidden; padding: 0 4px; }

table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; font-size: .8rem; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: .75rem; font-weight: 600; white-space: nowrap; }
.tag.good { background: color-mix(in srgb, var(--good) 15%, transparent); color: var(--good); }
.tag.warn { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.tag.bad { background: color-mix(in srgb, var(--bad) 15%, transparent); color: var(--bad); }
.tag.tech { background: color-mix(in srgb, var(--info) 15%, transparent); color: var(--info); }
.tag.train { background: var(--accent-soft); color: var(--accent); }
.bar { height: 6px; border-radius: 3px; background: var(--line); position: relative; min-width: 80px; }
.bar > i { position: absolute; top: 0; bottom: 0; border-radius: 3px; }

.issue { border-left: 4px solid var(--line); padding: 10px 14px; margin-bottom: 12px; background: var(--bg); border-radius: 0 8px 8px 0; }
.issue.training { border-color: var(--accent); }
.issue.technique { border-color: var(--info); }
.issue ul { margin: 6px 0 0; padding-left: 20px; }

.module { border: 1px solid var(--line); border-radius: 10px; padding: 14px; margin-bottom: 12px; }
.module table td:first-child { font-weight: 600; white-space: nowrap; }

.snaps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.snaps figure { margin: 0; }
.snaps img { width: 100%; border-radius: 8px; display: block; }
.snaps figcaption { font-size: .8rem; color: var(--muted); text-align: center; margin-top: 4px; }

.timeline { position: relative; height: 22px; margin: 4px 0 10px; }
.timeline .tick { position: absolute; top: 0; width: 2px; height: 22px; background: var(--accent); }
.timeline .tick span { position: absolute; top: -2px; left: 4px; font-size: .7rem; white-space: nowrap; color: var(--muted); }
input[type=range] { padding: 0; }
.evbtns { display: flex; flex-wrap: wrap; gap: 6px; }
.evbtns button.marked { background: var(--accent-soft); }

.delta-up { color: var(--good); }
.delta-down { color: var(--bad); }
.warnbox { background: color-mix(in srgb, var(--warn) 12%, transparent); border: 1px solid color-mix(in srgb, var(--warn) 40%, transparent); padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: .9rem; }
.chart-box { position: relative; height: 240px; }

@media (max-width: 600px) {
  main { padding: 16px 12px 40px; }
  .card { padding: 14px; }
  .hide-sm { display: none; }
  table { font-size: .82rem; }
}