:root {
  --bg: #0d1117;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.shell {
  text-align: center;
  padding: 2rem;
  max-width: 36rem;
}

.wordmark {
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.tld { color: var(--accent); }

.tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--fg);
  margin: 0 0 1.5rem;
}

.status {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0;
}

/* ── Converter layout ─────────────────────────────────────────────────────── */

#app {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.pc-header {
  text-align: center;
  margin-bottom: 2rem;
}

/* ── Dropzone ─────────────────────────────────────────────────────────────── */

:root {
  --border: #30363d;
  --row-bg: #161b22;
  --btn-bg: #21262d;
  --btn-hover: #30363d;
  --accent-dim: #1f6feb;
  --error: #f85149;
  --success: #3fb950;
  --radius: 8px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  position: relative;
  user-select: none;
}

.dropzone:hover,
.dropzone:focus-within {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.04);
  outline: none;
}

.dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.08);
}

.drop-icon {
  display: block;
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: var(--muted);
}

.drop-label {
  display: block;
  font-size: 1.05rem;
  color: var(--fg);
}

.drop-link {
  color: var(--accent);
  text-decoration: underline;
}

.drop-sub {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

/* ── File list ────────────────────────────────────────────────────────────── */

.file-list {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.file-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--row-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.75rem;
  flex-wrap: wrap;
}

.row-name {
  flex: 1 1 160px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9rem;
  color: var(--fg);
}

.row-format {
  background: var(--btn-bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 4px;
  padding: 0.3rem 0.4rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.row-format:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* ── Quality slider ───────────────────────────────────────────────────────── */

.row-quality-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.row-quality {
  width: 90px;
  accent-color: var(--accent);
  cursor: pointer;
}

.row-quality-value {
  min-width: 2.6ch;
  font-variant-numeric: tabular-nums;
  color: var(--fg);
}

/* ── Compress toggle ──────────────────────────────────────────────────────── */

.row-compress-wrap {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.row-compress {
  accent-color: var(--accent);
  cursor: pointer;
}

.row-level {
  background: var(--btn-bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 4px;
  padding: 0.25rem 0.35rem;
  font-size: 0.8rem;
  cursor: pointer;
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn-primary {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent);
}

.btn-secondary {
  background: var(--btn-bg);
  color: var(--fg);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--btn-hover);
}

.btn-sm {
  padding: 0.28rem 0.65rem;
  font-size: 0.82rem;
}

/* ── Row status ───────────────────────────────────────────────────────────── */

.row-status {
  font-size: 0.82rem;
  min-width: 0;
  flex: 1 1 180px;
}

.status-converting {
  color: var(--muted);
  font-style: italic;
}

.status-done .download-link {
  color: var(--success);
  word-break: break-all;
  text-decoration: none;
}

.status-done .download-link:hover {
  text-decoration: underline;
}

.status-done .file-size {
  color: var(--muted);
}

.status-error {
  color: var(--error);
}

/* ── Global actions bar ───────────────────────────────────────────────────── */

.actions-bar {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

/* ── Responsive tweaks ────────────────────────────────────────────────────── */

@media (max-width: 560px) {
  .file-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .row-name {
    width: 100%;
  }

  .row-quality-wrap,
  .row-compress-wrap {
    flex-wrap: wrap;
  }
}