/* ── Reset & base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg:         #0f1117;
  --color-surface:    #1a1d27;
  --color-border:     #2e3248;
  --color-text:       #e8eaf6;
  --color-text-muted: #8b90b3;
  --color-primary:    #5c6ef0;
  --color-primary-h:  #7b8bf5;
  --color-danger:     #e05252;
  --color-warning-bg: #2a2010;
  --color-warning-bd: #6b4f10;
  --radius:           10px;
  --shadow:           0 2px 12px rgba(0,0,0,.4);
  --transition:       .15s ease;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg:         #f2f4f8;
    --color-surface:    #ffffff;
    --color-border:     #d0d4e8;
    --color-text:       #14172b;
    --color-text-muted: #5a5f82;
    --color-primary:    #3d52e0;
    --color-primary-h:  #2b3db8;
    --color-warning-bg: #fffbe6;
    --color-warning-bd: #c9a800;
    --shadow:           0 2px 12px rgba(0,0,0,.08);
  }
}

html { font-size: 16px; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
  padding: 0 1rem 3rem;
  min-height: 100vh;
}

/* ── Layout ────────────────────────────────────────────────── */
.site-header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
}

.site-title {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
}

.site-tagline {
  color: var(--color-text-muted);
  font-size: .95rem;
  margin-top: .3rem;
}

.app {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.hidden { display: none !important; }

/* ── Typography helpers ─────────────────────────────────────── */
.section-heading {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.label {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: .35rem;
}

.hint {
  font-size: .8rem;
  color: var(--color-text-muted);
  margin-top: .4rem;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .6rem 1.2rem;
  border: none;
  border-radius: 7px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
  min-height: 44px; /* accessible touch target */
}

.btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled { opacity: .45; cursor: not-allowed; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:not(:disabled):hover { background: var(--color-primary-h); }

.btn-secondary {
  background: transparent;
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}
.btn-secondary:not(:disabled):hover { background: var(--color-border); }

.btn-large { padding: .8rem 2rem; font-size: 1rem; width: 100%; }

/* ── URL input row ──────────────────────────────────────────── */
.url-row {
  display: flex;
  gap: .6rem;
}

.url-input {
  flex: 1;
  min-width: 0;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 7px;
  color: var(--color-text);
  font-size: .95rem;
  padding: .55rem .85rem;
  transition: border-color var(--transition);
}

.url-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* ── Video meta ─────────────────────────────────────────────── */
.video-meta {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.video-thumb {
  width: 120px;
  height: 68px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
  background: var(--color-border);
}

.video-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

.video-author {
  font-size: .875rem;
  color: var(--color-text-muted);
  margin-top: .2rem;
}

.video-duration {
  font-size: .8rem;
  color: var(--color-text-muted);
  margin-top: .15rem;
}

/* ── Embed ──────────────────────────────────────────────────── */
.embed-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  background: #000;
  border-radius: 8px;
  overflow: hidden;
}

.embed-wrapper iframe,
.embed-wrapper #yt-player {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ── Timeline ───────────────────────────────────────────────── */
.timeline-container {
  margin-bottom: 1.25rem;
}

.timeline-track {
  position: relative;
  height: 40px;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
}

.timeline-range {
  position: absolute;
  top: 0;
  height: 100%;
  background: color-mix(in srgb, var(--color-primary) 25%, transparent);
  border-radius: 4px;
  pointer-events: none;
}

.timeline-handle {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 34px;
  background: var(--color-primary);
  border: none;
  border-radius: 5px;
  cursor: grab;
  transition: background var(--transition);
  touch-action: none;
  min-height: 34px;
}

.timeline-handle:hover,
.timeline-handle:focus-visible {
  background: var(--color-primary-h);
}

.timeline-handle:focus-visible {
  outline: 3px solid var(--color-primary-h);
  outline-offset: 3px;
}

@media (hover: none) {
  /* Bigger handles on touch devices */
  .timeline-handle {
    width: 24px;
    height: 44px;
  }
  .timeline-track {
    height: 52px;
  }
}

/* ── Time inputs ────────────────────────────────────────────── */
.time-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
  margin-bottom: 1rem;
}

#time-hint {
  grid-column: 1 / -1;
  margin-top: 0;
}

.time-input-group {
  display: flex;
  flex-direction: column;
}

.time-input {
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 7px;
  color: var(--color-text);
  font-size: .95rem;
  font-family: "SF Mono", "Consolas", "Menlo", monospace;
  padding: .55rem .85rem;
  transition: border-color var(--transition);
}

.time-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.time-input.invalid {
  border-color: var(--color-danger);
}

.clip-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.clip-duration {
  font-size: .875rem;
  color: var(--color-text-muted);
}

/* ── Format groups ──────────────────────────────────────────── */
.format-groups {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.format-group-heading {
  font-size: .8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: .6rem;
}

.format-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.format-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: .55rem .85rem;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  font-size: .875rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  min-height: 44px;
}

.format-btn:hover {
  border-color: var(--color-primary);
}

.format-btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.format-btn.selected {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-bg));
}

.format-btn-label { font-weight: 600; }
.format-btn-meta  { font-size: .78rem; color: var(--color-text-muted); margin-top: .1rem; }
.format-btn-reencode {
  font-size: .72rem;
  color: #f0a040;
  margin-top: .1rem;
}

/* ── Progress ───────────────────────────────────────────────── */
.progress-container {
  margin-top: 1rem;
}

.progress-bar-track {
  height: 8px;
  background: var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: .5rem;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--color-primary);
  border-radius: 4px;
  transition: width .2s ease;
}

.progress-label {
  font-size: .875rem;
  color: var(--color-text-muted);
}

/* ── Alerts ─────────────────────────────────────────────────── */
.error-box {
  background: color-mix(in srgb, var(--color-danger) 12%, var(--color-surface));
  border: 1.5px solid var(--color-danger);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  color: var(--color-text);
}

.warning-box {
  background: var(--color-warning-bg);
  border: 1.5px solid var(--color-warning-bd);
  border-radius: 8px;
  padding: .75rem 1rem;
  font-size: .875rem;
  color: var(--color-text);
  margin-top: 1rem;
}

/* ── Accessibility helpers ──────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
  .progress-bar-fill { transition: none !important; }
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 2rem 1rem 1rem;
  max-width: 780px;
  margin: 0 auto;
}

.copyright-notice {
  font-size: .8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ── Mobile tweaks ───────────────────────────────────────────── */
@media (max-width: 480px) {
  .card { padding: 1.1rem; }
  .video-thumb { width: 90px; height: 51px; }
  .time-inputs { grid-template-columns: 1fr; }
  #time-hint { grid-column: auto; }
  .url-row { flex-direction: column; }
  .url-row .btn { width: 100%; }
}