:root {
  --ink: #1f3247;
  --muted: #55677b;
  --brand: #126d70;
  --brand-dark: #0d575a;
  --danger: #a3333b;
  --bg: #f5f7fb;
  --card: #fff;
  --line: #d6e0ea;
  --soft: #eaf2f4;
  --warn-bg: #fff6e0;
  --warn-ink: #6b4b00;
  --radius: 10px;
  --radius-lg: 14px;
  --gap: 16px;
  font-family: "Leelawadee UI", "Segoe UI", Tahoma, sans-serif;
  font-size: 16px;
  color: var(--ink);
  background: var(--bg);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); line-height: 1.7; }
[hidden] { display: none !important; }

.top { padding: 14px 24px; background: var(--card); border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px var(--gap); }
.brand { display: flex; align-items: center; gap: 10px; font-size: 18px; }
.logo { background: var(--brand); color: #fff; padding: 6px 9px; border-radius: var(--radius); font-weight: 700; }
.muted { color: var(--muted); font-size: 15px; }

main { display: grid; grid-template-columns: 280px 1fr; max-width: 1400px; margin: auto; min-height: 85vh; }
aside { padding: 24px 16px; border-right: 1px solid var(--line); }
section { padding: 32px 40px; min-width: 0; }
h1 { font-size: 34px; line-height: 1.45; margin: 8px 0 12px; overflow-wrap: anywhere; }
h2 { font-size: 18px; margin: 24px 0 8px; }
.eyebrow { color: var(--brand); font-weight: 600; }

form { max-width: 700px; margin-top: 24px; }
label { display: block; margin: 16px 0; }
input, textarea { display: block; width: 100%; margin-top: 4px; padding: 10px 12px; min-height: 44px; font: inherit; color: inherit; border: 1px solid #b9c7d5; border-radius: var(--radius); background: var(--card); }
textarea { resize: vertical; }
input:focus, textarea:focus, button:focus-visible, summary:focus-visible { outline: 3px solid #7fc3c5; outline-offset: 1px; }
.check { display: flex; gap: 10px; align-items: center; }
.check input { width: 22px; min-height: 22px; height: 22px; margin: 0; flex: none; }

button { min-height: 44px; padding: 8px 16px; border: 1px solid #b9c7d5; background: var(--card); border-radius: var(--radius); font: inherit; color: inherit; cursor: pointer; }
button:hover { background: var(--soft); }
button:disabled { opacity: .55; cursor: not-allowed; }
.primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.primary:hover { background: var(--brand-dark); }
.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.danger:hover { background: #87272e; }
.ghost-danger { color: var(--danger); border-color: #e0b4b8; }
.wide { width: 100%; }

.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 16px 0; }
.timer { font-size: 22px; font-variant-numeric: tabular-nums; min-width: 72px; }
video { display: block; width: 100%; max-height: 470px; background: #18222e; border-radius: var(--radius-lg); margin: 16px 0; }

.library-item { display: block; width: 100%; text-align: left; margin: 8px 0; padding: 10px 12px; overflow-wrap: anywhere; }
.library-item.active { border-color: var(--brand); background: var(--soft); }
.library-item small { display: block; color: var(--muted); font-size: 14px; }
.note { margin-top: 24px; padding: 12px; background: var(--warn-bg); color: var(--warn-ink); border-radius: var(--radius); font-size: 14px; }
.note strong { display: block; }
.note span { display: block; margin-top: 6px; }
.warn { background: var(--warn-bg); color: var(--warn-ink); padding: 10px 12px; border-radius: var(--radius); }

details { margin: 16px 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 4px 16px 12px; }
summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; font-weight: 600; }

.tip { background: var(--soft); padding: 10px 12px; border-radius: var(--radius); }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 4px 16px; margin: 16px 0; }
label.inline { margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
select { min-height: 44px; padding: 8px 12px; font: inherit; color: inherit; border: 1px solid #b9c7d5; border-radius: var(--radius); background: var(--card); max-width: 100%; }
progress { display: block; width: 100%; height: 14px; margin: 10px 0 0; accent-color: var(--brand); }
#progress { padding: 12px 0; }
.tag { display: inline-block; margin-left: 6px; padding: 0 8px; border-radius: 999px; background: var(--soft); color: var(--brand-dark); font-size: 13px; font-weight: 600; }
.analyzer-video { position: fixed; left: 0; bottom: 0; width: 2px; height: 2px; opacity: 0; pointer-events: none; }

.empty { padding: 24px; border: 2px dashed var(--line); border-radius: var(--radius-lg); color: var(--muted); }
.step { background: var(--card); padding: 20px; border: 1px solid var(--line); border-radius: var(--radius-lg); margin: 16px 0; }
.step.is-hidden { border-style: dashed; background: #f3f5f8; }
.nudge { margin: 6px 0 0; }
.step img { display: block; width: 100%; max-height: 440px; min-height: 120px; object-fit: contain; background: #eef2f6; border-radius: 8px; margin-top: 8px; }
.step label { margin: 12px 0; }
.step .toolbar { margin: 8px 0 0; }

#message { white-space: pre-wrap; padding: 10px 0; overflow-wrap: anywhere; }
#message[data-kind="error"] { color: var(--danger); font-weight: 600; }

@media (max-width: 800px) {
  main { grid-template-columns: 1fr; }
  aside { border-right: 0; border-bottom: 1px solid var(--line); }
  section { padding: 20px 16px; }
  .top { padding: 12px 16px; }
  h1 { font-size: 26px; }
  .step { padding: 14px; }
  .toolbar button { flex: 1 1 auto; }
}