/* yt-mp3 — design minimale, dark-first (coerente con transfer-app) */
:root {
  --bg: #0d0d10;
  --bg-soft: #16161b;
  --border: #26262e;
  --text: #f2f2f5;
  --text-dim: #8a8a96;
  --accent: #e8e4da;
  --accent-text: #111114;
  --danger: #e5484d;
  --radius: 14px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f6f3;
    --bg-soft: #ffffff;
    --border: #e4e2dc;
    --text: #17171a;
    --text-dim: #75757e;
    --accent: #17171a;
    --accent-text: #f7f6f3;
  }
}

:root[data-theme="dark"] {
  --bg: #0d0d10; --bg-soft: #16161b; --border: #26262e;
  --text: #f2f2f5; --text-dim: #8a8a96; --accent: #e8e4da; --accent-text: #111114;
}
:root[data-theme="light"] {
  --bg: #f7f6f3; --bg-soft: #ffffff; --border: #e4e2dc;
  --text: #17171a; --text-dim: #75757e; --accent: #17171a; --accent-text: #f7f6f3;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  padding: clamp(16px, 4vw, 48px);
}

main { width: 100%; max-width: 960px; margin: auto; }
.narrow { max-width: 480px; }

.brand {
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-align: center;
  margin-bottom: clamp(20px, 4vh, 44px);
  user-select: none;
}

.panel {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(22px, 4vw, 36px);
}

.stack { display: flex; flex-direction: column; gap: 14px; }

.field {
  width: 100%;
  font: inherit;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
}
.field:focus { border-color: var(--text-dim); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 30px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--accent);
  color: var(--accent-text);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, opacity 0.12s ease;
}
.btn:hover { transform: translateY(-1px); opacity: 0.92; }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.6; cursor: default; transform: none; }

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border-color: var(--border);
  font-weight: 500;
}
.btn-ghost:hover { color: var(--text); }

.error { color: var(--danger); font-size: 14px; min-height: 18px; }
.sub { font-size: 13.5px; color: var(--text-dim); line-height: 1.5; }

.hint {
  color: var(--text-dim);
  font-size: 12.5px;
  text-align: center;
  margin-top: 16px;
  line-height: 1.55;
}

.actions { display: flex; justify-content: center; }

.hidden { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}