:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --panel: #14181e;
  --panel-2: #1b2129;
  --line: #2a3340;
  --text: #e8edf4;
  --muted: #9aa7b7;
  --accent: #57d3a3;
  --accent-2: #7cc7ff;
  --warn: #ffd166;
  --bad: #ff7a8a;
  --good: #7ee2b8;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: radial-gradient(circle at top, #18202a 0, var(--bg) 42%);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent-2); }

.wrap {
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  padding: 4rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

h2 { margin: 0 0 1rem; font-size: 1.4rem; }
h3 { margin: 1.5rem 0 0.5rem; font-size: 1.05rem; }

.lede {
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.08rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.nav a {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
}

.nav a:hover { border-color: var(--accent); }

main { padding: 2rem 0 3rem; }

.card {
  margin: 1.25rem 0;
  padding: 1.5rem;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 10px 30px rgb(0 0 0 / 0.18);
}

.notice {
  margin: 1.25rem 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--warn);
  background: #221d12;
  border-radius: 10px;
  color: #f3e7c8;
}

ol, ul { padding-left: 1.25rem; }

code {
  padding: 0.1rem 0.3rem;
  border-radius: 5px;
  background: #0a0d11;
  color: #c9f0e2;
  font-size: 0.92em;
}

pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  background: #07090c;
  border: 1px solid var(--line);
  border-radius: 10px;
}

pre code {
  padding: 0;
  background: none;
  color: #c9f0e2;
  white-space: pre;
}

.code-row {
  display: flex;
  gap: 0.6rem;
  align-items: stretch;
  margin: 0.75rem 0;
}

.code-row pre { flex: 1; }

button, .button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #202833;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

button:hover:not(:disabled), .button-link:hover { border-color: var(--accent); }

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.button-link {
  margin-top: 0.75rem;
  background: #173f33;
  border-color: #2b6b58;
}

.file-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.step {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.step:first-of-type { border-top: 0; padding-top: 0; }

.step-num {
  flex: 0 0 2rem;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #0d1116;
  color: var(--accent);
  font-weight: 700;
}

.step-body { flex: 1; min-width: 0; }
.step-body h3 { margin-top: 0; }

button.primary {
  background: #173f33;
  border-color: #2b6b58;
}

.check {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.75rem;
  color: var(--muted);
}

progress {
  width: 100%;
  height: 12px;
  margin-top: 0.75rem;
  accent-color: var(--accent);
}

@media (max-width: 640px) {
  .step { gap: 0.75rem; }
  .step-num { flex-basis: 1.75rem; width: 1.75rem; height: 1.75rem; }
}

input[type="file"] {
  max-width: 100%;
  color: var(--muted);
}

.status {
  min-height: 1.4rem;
  margin-top: 0.75rem;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.status.good { color: var(--good); }
.status.warn { color: var(--warn); }
.status.bad { color: var(--bad); }

.hint { color: var(--muted); font-size: 0.92rem; }

.counts {
  width: 100%;
  margin-top: 1rem;
  border-collapse: collapse;
}

.counts th, .counts td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.counts th { color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; }
.counts td:last-child { font-variant-numeric: tabular-nums; }

.video-list {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.video-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.75rem;
  background: #0d1116;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
}

.video-card:hover { border-color: var(--accent); }

.video-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
}

footer {
  padding: 1.5rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .hero { padding-top: 2.5rem; }
  .card { padding: 1.1rem; }
  .code-row { flex-direction: column; }
  .code-row button { align-self: flex-start; }
}