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

:root {
  --bg: #050708;
  --bg-2: #0a0d10;
  --bg-3: #111519;
  --line: rgba(255,255,255,0.06);
  --line-2: rgba(255,255,255,0.10);
  --txt: #e6ebf0;
  --mute: #8a94a0;
  --cyan: #22d3ee;
  --cyan-soft: rgba(34,211,238,0.14);
  --cyan-glow: rgba(34,211,238,0.08);
  --violet: #a78bfa;
  --violet-soft: rgba(167,139,250,0.14);
  --violet-glow: rgba(167,139,250,0.08);
  --lime: #a3e635;
  --rose: #fb7185;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;
  font-size: 16px;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--txt);
  min-height: 100vh;
  line-height: 1.5;
}

/* ── Header ── */
.back-link {
  font-size: 0.8rem;
  color: var(--mute);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s;
  white-space: nowrap;
}
.back-link:hover { color: var(--cyan); }

.header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 40px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.logo {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--txt);
}

.logo span { color: var(--cyan); }

.tabs {
  display: flex;
  gap: 4px;
  margin-left: auto;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px;
}

.tab-btn {
  padding: 8px 20px;
  border: none;
  background: transparent;
  color: var(--mute);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.tab-btn:hover { color: var(--txt); }

.tab-btn:focus-visible {
  outline: 2px solid var(--accent, var(--cyan));
  outline-offset: 2px;
}

.tab-btn.active[data-tab="light"] {
  background: var(--cyan-soft);
  color: var(--cyan);
}

.tab-btn.active[data-tab="pro"] {
  background: var(--violet-soft);
  color: var(--violet);
}

/* ── Layout principal ── */
.main {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px;
}

.panel { display: none; }
.panel.active { display: block; }

/* ── Drop zone ── */
.drop-zone {
  border: 2px dashed var(--line-2);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  background: var(--bg-2);
  position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent, var(--cyan));
  background: var(--accent-glow, var(--cyan-glow));
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.drop-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
}

.drop-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--txt);
  margin-bottom: 6px;
}

.drop-sub {
  font-size: 0.875rem;
  color: var(--mute);
}

/* ── Preview ── */
.preview-wrap {
  display: none;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-2);
  margin-top: 20px;
}

.preview-wrap.visible { display: block; }

.preview-wrap img,
.preview-wrap video,
.preview-wrap audio {
  display: block;
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  background: var(--bg-3);
}

.preview-wrap audio { padding: 16px; }

.file-info {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-top: 20px;
}

.file-info.visible { display: flex; }

.file-info-icon { font-size: 1.5rem; }

.file-info-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--txt);
  word-break: break-all;
}

.file-info-size { font-size: 0.8rem; color: var(--mute); }

.file-info-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--mute);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  border-radius: 4px;
  transition: color 0.2s;
}

.file-info-close:hover { color: var(--rose); }

.file-info-close:focus-visible {
  outline: 2px solid var(--rose);
  outline-offset: 2px;
}

/* ── Formats ── */
.formats-section {
  display: none;
  margin-top: 28px;
}

.formats-section.visible { display: block; }

.formats-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--mute);
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
}

.formats-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.format-pill {
  padding: 7px 14px;
  border-radius: 99px;
  border: 1px solid var(--line-2);
  background: var(--bg-2);
  color: var(--txt);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s;
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.format-pill:hover {
  border-color: var(--accent, var(--cyan));
  color: var(--accent, var(--cyan));
}

.format-pill:focus-visible {
  outline: 2px solid var(--accent, var(--cyan));
  outline-offset: 2px;
}

.format-pill.selected {
  background: var(--accent-soft, var(--cyan-soft));
  border-color: var(--accent, var(--cyan));
  color: var(--accent, var(--cyan));
}

/* ── Options avancées ── */
.advanced-section {
  display: none;
  margin-top: 20px;
  padding: 20px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.advanced-section.visible { display: block; }

.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.option-row:last-child { margin-bottom: 0; }

.option-label {
  font-size: 0.8rem;
  color: var(--mute);
  font-family: 'JetBrains Mono', monospace;
  min-width: 80px;
}

.option-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent, var(--cyan));
}

.option-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent, var(--cyan));
  cursor: pointer;
}

.option-row input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent, var(--cyan));
  cursor: pointer;
  border: none;
}

.option-row input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--bg-3);
  border-radius: 99px;
}

.option-value {
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent, var(--cyan));
  min-width: 40px;
  text-align: right;
}

/* ── Bouton convertir ── */
.convert-btn {
  display: none;
  width: 100%;
  margin-top: 24px;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.02em;
}

.convert-btn.visible { display: block; }

.panel[data-panel="light"] .convert-btn {
  background: var(--cyan);
  color: #000;
}

.panel[data-panel="light"] .convert-btn:hover {
  background: #06b6d4;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(34,211,238,0.3);
}

.panel[data-panel="pro"] .convert-btn {
  background: var(--violet);
  color: #fff;
}

.panel[data-panel="pro"] .convert-btn:hover {
  background: #7c3aed;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(167,139,250,0.3);
}

.convert-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.convert-btn:focus-visible {
  outline: 2px solid var(--accent, var(--cyan));
  outline-offset: 3px;
}

/* ── Progress ── */
.progress-wrap {
  display: none;
  margin-top: 20px;
}

.progress-wrap.visible { display: block; }

.progress-bar {
  height: 6px;
  background: var(--bg-3);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  background: var(--accent, var(--cyan));
  border-radius: 99px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-label {
  font-size: 0.8rem;
  color: var(--mute);
  font-family: 'JetBrains Mono', monospace;
  text-align: center;
}

/* ── Résultat ── */
.result-wrap {
  display: none;
  margin-top: 20px;
  padding: 24px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: center;
}

.result-wrap.visible { display: block; }

.result-icon { font-size: 2rem; margin-bottom: 8px; display: block; }

.result-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--txt);
  margin-bottom: 16px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--lime);
  color: #000;
}

.download-btn:hover { background: #84cc16; transform: translateY(-1px); }

.download-btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ── Message erreur ── */
.error-msg {
  display: none;
  margin-top: 12px;
  padding: 12px 16px;
  background: rgba(251,113,133,0.1);
  border: 1px solid rgba(251,113,133,0.3);
  border-radius: var(--radius-sm);
  color: var(--rose);
  font-size: 0.875rem;
}

.error-msg.visible { display: block; }

/* ── FFmpeg init overlay ── */
.ffmpeg-init {
  display: none;
  padding: 40px;
  text-align: center;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.ffmpeg-init.visible { display: block; }

.ffmpeg-init-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 20px;
  color: var(--violet);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .header { padding: 16px 20px; flex-wrap: wrap; }
  .tabs { margin-left: 0; width: 100%; }
  .main { padding: 24px 16px; }
  .drop-zone { padding: 40px 20px; }
  .formats-grid { gap: 6px; }
  .format-pill { padding: 6px 11px; font-size: 0.75rem; }
}