*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-hover: #242424;
  --border: #2a2a2a;
  --text-primary: #f0f0f0;
  --text-secondary: #888;
  --accent: #fa2d55;
  --amazon: #ff9900;
  --rank-color: #444;
  --rank-top3: #fa2d55;
}

html {
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header ─── */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 1rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

/* ─── Main ─── */
.main {
  flex: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem;
}

/* ─── Loading ─── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ─── Error ─── */
.error {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

.error button {
  margin-top: 1rem;
  padding: 0.5rem 1.25rem;
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

.error button:hover {
  background: var(--surface-hover);
}

/* ─── Track list ─── */
.track-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ─── Track card ─── */
.track-card {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  transition: background 0.15s;
}

.track-card:hover {
  background: var(--surface-hover);
}

.track-rank {
  font-size: 1rem;
  font-weight: 700;
  color: var(--rank-color);
  min-width: 2rem;
  text-align: center;
  flex-shrink: 0;
}

.track-card:nth-child(1) .track-rank,
.track-card:nth-child(2) .track-rank,
.track-card:nth-child(3) .track-rank {
  color: var(--rank-top3);
}

.track-thumb {
  width: 52px;
  height: 52px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--border);
}

.track-info {
  flex: 1;
  min-width: 0;
}

.track-name {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-artist {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-actions {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: opacity 0.15s;
}

.btn:hover {
  opacity: 0.85;
}

.btn-apple {
  background: var(--accent);
  color: #fff;
}

.btn-amazon {
  background: var(--amazon);
  color: #000;
}

.btn-preview {
  background: var(--surface-hover);
  color: var(--text-primary);
  border: 1px solid var(--border);
  cursor: pointer;
  font-family: inherit;
}

.btn-preview.playing {
  background: #1db954;
  color: #000;
  border-color: transparent;
}

.btn-preview:disabled {
  opacity: 0.5;
  cursor: default;
}

.btn-preview.unavailable {
  opacity: 0.35;
  font-size: 0.65rem;
  cursor: not-allowed;
}

/* ─── Utilities ─── */
.hidden {
  display: none !important;
}

/* ─── Footer ─── */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: underline;
}

.disclaimer {
  font-size: 0.7rem;
  opacity: 0.6;
}

/* ─── Responsive ─── */
@media (max-width: 480px) {
  .track-thumb {
    width: 44px;
    height: 44px;
  }

  .track-actions {
    flex-direction: row;
  }

  .btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
  }
}