:root {
  --bg-deep: #07070a;
  --bg-panel: #111118;
  --bg-elevated: #181822;
  --bg-hover: #222230;
  --gold: #d4af37;
  --gold-soft: #f0d78c;
  --gold-glow: rgba(212, 175, 55, 0.35);
  --text: #f5f5f7;
  --text-muted: #9a9aad;
  --danger: #ff5c7a;
  --success: #4ade80;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 18px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "DM Sans", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 15% 10%, rgba(212, 175, 55, 0.12), transparent 35%),
    radial-gradient(circle at 85% 0%, rgba(120, 90, 255, 0.08), transparent 30%),
    var(--bg-deep);
  color: var(--text);
  font-family: var(--font-body);
}

body {
  padding: 32px;
}

.app-shell {
  max-width: 1280px;
  margin: 0 auto;
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
  padding: 28px 32px;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 8px);
  background: linear-gradient(135deg, rgba(24, 24, 34, 0.95), rgba(12, 12, 18, 0.95));
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-mark {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, var(--gold), #9a7420);
  color: #120f08;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  box-shadow: 0 0 40px var(--gold-glow);
}

.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: 0.02em;
}

.brand p {
  margin: 6px 0 0;
  color: var(--text-muted);
}

.stats {
  display: flex;
  gap: 16px;
}

.stat-card {
  min-width: 120px;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  text-align: center;
}

.stat-card strong {
  display: block;
  font-size: 28px;
  color: var(--gold-soft);
}

.stat-card span {
  color: var(--text-muted);
  font-size: 13px;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  background: rgba(17, 17, 24, 0.92);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 22px;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 {
  margin: 0;
  font-size: 18px;
}

.panel-body {
  padding: 20px 22px;
}

.folder-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 520px;
  overflow: auto;
}

.folder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: var(--bg-elevated);
  cursor: pointer;
  transition: 0.2s ease;
}

.folder-item:hover,
.folder-item.active {
  border-color: rgba(212, 175, 55, 0.35);
  background: var(--bg-hover);
}

.folder-item.active {
  box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.2);
}

.folder-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.folder-meta strong {
  font-size: 15px;
}

.folder-meta span {
  color: var(--text-muted);
  font-size: 12px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.input, .select {
  flex: 1;
  min-width: 180px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font: inherit;
}

.input:focus, .select:focus {
  outline: none;
  border-color: rgba(212, 175, 55, 0.5);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.12);
}

.btn {
  border: none;
  border-radius: 14px;
  padding: 14px 18px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gold), #b8942d);
  color: #120f08;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 30px var(--gold-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-danger {
  background: rgba(255, 92, 122, 0.12);
  color: var(--danger);
  border: 1px solid rgba(255, 92, 122, 0.25);
}

.dropzone {
  border: 2px dashed rgba(212, 175, 55, 0.35);
  border-radius: calc(var(--radius) + 2px);
  padding: 36px 24px;
  text-align: center;
  background: rgba(212, 175, 55, 0.04);
  transition: 0.2s ease;
  margin-bottom: 24px;
}

.dropzone.dragover {
  border-color: var(--gold);
  background: rgba(212, 175, 55, 0.1);
  transform: scale(1.01);
}

.dropzone p {
  margin: 0 0 8px;
  font-size: 18px;
}

.dropzone small {
  color: var(--text-muted);
}

.track-table {
  width: 100%;
  border-collapse: collapse;
}

.track-table th,
.track-table td {
  padding: 14px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.track-table th {
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.track-title {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.track-title strong {
  font-size: 15px;
}

.track-title span {
  color: var(--text-muted);
  font-size: 12px;
}

.empty-state {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-muted);
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  padding: 16px 20px;
  border-radius: 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  transition: 0.25s ease;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.success { border-color: rgba(74, 222, 128, 0.35); }
.toast.error { border-color: rgba(255, 92, 122, 0.35); }

@media (max-width: 960px) {
  body { padding: 16px; }
  .hero { flex-direction: column; align-items: flex-start; }
  .layout { grid-template-columns: 1fr; }
}