/* ============================================
   SUNO AI MUSIC STUDIO — Premium Dark Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  --bg-base: #05060f;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --bg-input: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(168, 85, 247, 0.4);
  --text-primary: #f0f0ff;
  --text-secondary: rgba(240, 240, 255, 0.55);
  --text-muted: rgba(240, 240, 255, 0.35);
  --purple: #a855f7;
  --purple-light: #c084fc;
  --cyan: #06b6d4;
  --cyan-light: #22d3ee;
  --indigo: #6366f1;
  --pink: #ec4899;
  --green: #10b981;
  --red: #ef4444;
  --orange: #f59e0b;
  --grad-main: linear-gradient(135deg, #a855f7, #06b6d4);
  --grad-btn: linear-gradient(135deg, #7c3aed, #a855f7, #06b6d4);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.06);
  --shadow-glow: 0 0 40px rgba(168, 85, 247, 0.15);
  --radius-card: 20px;
  --radius-input: 12px;
  --radius-btn: 12px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  padding-bottom: 100px;
}

/* ---- Animated Background Orbs ---- */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: orbFloat 8s ease-in-out infinite;
}
.bg-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(168,85,247,0.18) 0%, transparent 70%);
  top: -150px; left: -100px;
  animation-delay: 0s;
}
.bg-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(6,182,212,0.14) 0%, transparent 70%);
  bottom: 10%; right: -100px;
  animation-delay: -4s;
}
.bg-orb-3 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(99,102,241,0.12) 0%, transparent 70%);
  top: 40%; left: 30%;
  animation-delay: -2s;
}
@keyframes orbFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

/* ---- Particles ---- */
.particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.particle {
  position: absolute;
  width: 2px; height: 2px;
  background: rgba(168, 85, 247, 0.6);
  border-radius: 50%;
  animation: particleFloat linear infinite;
}
@keyframes particleFloat {
  0% { transform: translateY(100vh) translateX(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 0.5; }
  100% { transform: translateY(-100px) translateX(20px); opacity: 0; }
}

/* ---- Navbar ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: rgba(5, 6, 15, 0.7);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo svg { width: 32px; height: 32px; }
.nav-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.credits-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--purple-light);
  cursor: default;
  transition: var(--transition);
}
.credits-badge:hover { background: rgba(168, 85, 247, 0.2); }
.btn-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.btn-icon:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
  transform: rotate(30deg);
}

/* ---- Gradient Text ---- */
.gradient-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- Main Container ---- */
.main-container {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px 40px;
}

/* ---- Hero ---- */
.hero-section {
  text-align: center;
  margin-bottom: 40px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--purple-light);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}
.pulse-dot {
  width: 7px; height: 7px;
  background: var(--purple);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(168, 85, 247, 0.6); }
  50% { box-shadow: 0 0 0 6px rgba(168, 85, 247, 0); }
}
.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}
.hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- Tabs ---- */
.tabs-container {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 6px;
}
.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 16px;
  border-radius: 11px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.tab-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.04); }
.tab-btn.active {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.3);
}
.tab-btn svg { flex-shrink: 0; }

/* ---- Glass Panel ---- */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-glass);
}

/* ---- Tab Content ---- */
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Cover Sub-mode ---- */
.cover-submode-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: 4px;
}
.cover-submode-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: 9px;
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
}
.cover-submode-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.04); }
.cover-submode-btn.active {
  background: linear-gradient(135deg, rgba(6,182,212,0.55), rgba(168,85,247,0.55));
  color: #fff;
  box-shadow: 0 2px 14px rgba(6, 182, 212, 0.25);
}
.cover-subcontent { display: none; }
.cover-subcontent.active { display: block; animation: fadeIn 0.3s ease; }

.form-hint-inline {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
}

/* ---- Upload Area ---- */
.upload-area {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.upload-url-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.upload-or {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  flex-shrink: 0;
}
.btn-upload {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 18px;
  border-radius: var(--radius-input);
  border: 1px solid rgba(6, 182, 212, 0.35);
  background: rgba(6, 182, 212, 0.08);
  color: #67e8f9;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: 'Inter', sans-serif;
}
.btn-upload:hover {
  background: rgba(6, 182, 212, 0.16);
  border-color: rgba(6, 182, 212, 0.55);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(6, 182, 212, 0.2);
}
.btn-upload:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}
.upload-dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 20px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-input);
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition);
}
.upload-dropzone:hover,
.upload-dropzone.drag-over {
  border-color: rgba(6, 182, 212, 0.55);
  background: rgba(6, 182, 212, 0.05);
  color: #67e8f9;
}
.upload-progress {
  display: flex;
  align-items: center;
  gap: 12px;
}
.upload-progress-bar {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.upload-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #06b6d4, #a855f7);
  border-radius: 2px;
  transition: width 0.3s ease;
  box-shadow: 0 0 8px rgba(6, 182, 212, 0.4);
}
.upload-progress-text {
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
  min-width: 90px;
}

/* ---- Form Elements ---- */
.form-group { margin-bottom: 20px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.char-counter {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
}
.char-counter.warning { color: var(--orange); }
.char-counter.danger { color: var(--red); }

.form-input, .form-textarea, .form-select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.93rem;
  padding: 12px 16px;
  transition: var(--transition);
  outline: none;
  appearance: none;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--border-hover);
  background: rgba(168, 85, 247, 0.06);
  box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
}
.form-textarea { resize: vertical; min-height: 90px; line-height: 1.6; }
.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='rgba(240,240,255,0.4)' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}
.form-select option { background: #0d0e1a; color: var(--text-primary); }
.form-hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; }
.form-hint a { color: var(--purple-light); text-decoration: none; }
.form-hint a:hover { text-decoration: underline; }

.input-with-icon {
  position: relative;
  display: flex;
  align-items: center;
}
.input-with-icon svg:first-child {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
}
.input-with-icon .form-input {
  padding-left: 42px;
}
.toggle-visibility {
  position: absolute;
  right: 14px;
  top: 0;
  bottom: 0;
  z-index: 2;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.toggle-visibility:hover { color: var(--text-primary); }

/* ---- Toggle Group ---- */
.toggle-group {
  display: flex;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: 4px;
  gap: 4px;
}
.toggle-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 9px;
  border: none;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.toggle-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.toggle-btn.active {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 2px 12px rgba(168, 85, 247, 0.3);
}

/* ---- Advanced Section ---- */
.advanced-section { margin-top: 4px; }
.advanced-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  padding: 6px 0;
  transition: var(--transition);
  letter-spacing: 0.02em;
}
.advanced-toggle:hover { color: var(--purple-light); }
.advanced-toggle svg { transition: transform 0.25s ease; }
.advanced-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.advanced-content {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  animation: fadeIn 0.3s ease;
}
.advanced-content.open { display: block; }
.sliders-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.slider-group {}
.slider-val {
  font-weight: 600;
  color: var(--purple-light);
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.85rem;
}
.form-range {
  width: 100%;
  margin-top: 8px;
  -webkit-appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--grad-main);
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.5);
  cursor: pointer;
  transition: transform 0.15s ease;
}
.form-range::-webkit-slider-thumb:hover { transform: scale(1.2); }
.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---- Generate Section ---- */
.generate-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.btn-generate {
  display: block;
  width: 100%;
  max-width: 360px;
  padding: 0;
  border: none;
  border-radius: var(--radius-btn);
  background: var(--grad-btn);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 24px rgba(168, 85, 247, 0.35);
}
.btn-generate:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(168, 85, 247, 0.5);
}
.btn-generate:active { transform: translateY(0); }
.btn-generate:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}
.btn-generate-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px 32px;
  min-height: 54px;
}
.generate-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
}
.btn-generate::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}
.btn-generate:hover::before { transform: translateX(100%); }
.generate-loader { display: none; }
.btn-generate.loading .generate-content { visibility: hidden; }
.btn-generate.loading .generate-loader {
  display: block;
  position: absolute;
  width: 22px; height: 22px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.generate-hint { font-size: 0.8rem; color: var(--text-muted); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-btn);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 4px 16px rgba(168, 85, 247, 0.3);
}
.btn-primary:hover { box-shadow: 0 6px 24px rgba(168, 85, 247, 0.45); transform: translateY(-1px); }
.btn-secondary {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-secondary:hover { border-color: var(--border-hover); color: var(--text-primary); }
.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text-primary); border-color: var(--border-hover); }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; animation: fadeIn 0.2s ease; }
.modal-card {
  background: #0d0e1a;
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: 20px;
  width: 100%;
  max-width: 460px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6), 0 0 60px rgba(168, 85, 247, 0.1);
  animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}
.modal-header h2 { font-size: 1.1rem; font-weight: 700; }
.modal-close {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
  border: none;
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.modal-close:hover { background: rgba(255,255,255,0.08); color: var(--text-primary); }
.modal-body { padding: 20px 24px; }
.modal-footer {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding: 0 24px 20px;
}

/* ---- Progress Card ---- */
.results-section { margin-top: 24px; }
.progress-card {
  margin-bottom: 20px;
}
.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 16px;
}
.progress-info {
  display: flex;
  align-items: center;
  gap: 14px;
}
.progress-spinner {
  width: 36px; height: 36px;
  border: 2px solid var(--border);
  border-top-color: var(--purple);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}
.progress-info h3 { font-size: 1rem; font-weight: 600; }
.progress-info p { font-size: 0.82rem; color: var(--text-secondary); margin-top: 2px; }
.progress-stage-badges {
  display: flex;
  align-items: center;
  gap: 6px;
}
.stage-badge {
  padding: 4px 10px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
}
.stage-badge.active {
  background: rgba(168, 85, 247, 0.15);
  border-color: rgba(168, 85, 247, 0.4);
  color: var(--purple-light);
}
.stage-badge.done {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.4);
  color: var(--green);
}
.stage-arrow { color: var(--text-muted); font-size: 1.1rem; }
.progress-bar-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--grad-main);
  border-radius: 2px;
  transition: width 0.5s ease;
  width: 5%;
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.5);
}
.progress-task-id {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 10px;
  font-family: monospace;
}

/* ---- Tracks Grid ---- */
.tracks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

/* ---- Track Card ---- */
.track-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition);
  animation: fadeIn 0.4s ease;
}
.track-card:hover {
  border-color: rgba(168, 85, 247, 0.3);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3), var(--shadow-glow);
}
.track-cover {
  position: relative;
  width: 100%;
  padding-bottom: 100%;
  overflow: hidden;
  background: linear-gradient(135deg, #1a0a2e, #0a1628);
}
.track-cover img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.track-card:hover .track-cover img { transform: scale(1.04); }
.track-cover-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(168,85,247,0.2), rgba(6,182,212,0.15));
  font-size: 3rem;
}
.track-play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.track-card:hover .track-play-overlay { opacity: 1; }
.track-play-btn {
  width: 54px; height: 54px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(168, 85, 247, 0.9);
  border-radius: 50%;
  border: none;
  cursor: pointer;
  color: #fff;
  transition: transform 0.2s ease, background 0.2s ease;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.5);
}
.track-play-btn:hover { transform: scale(1.1); background: var(--purple); }
.track-play-btn.playing {
  background: rgba(6, 182, 212, 0.9);
}
.track-info {
  padding: 14px 16px 12px;
}
.track-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.track-tags {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 10px;
}
.track-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.track-duration {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}
.track-model-badge {
  padding: 3px 8px;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.25);
  color: var(--purple-light);
}
.track-actions {
  display: flex;
  gap: 6px;
  padding: 0 12px 12px;
}
.track-action-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 7px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.track-action-btn:hover { border-color: var(--border-hover); color: var(--text-primary); background: var(--bg-card-hover); }
.track-action-btn.download-btn:hover { border-color: rgba(16, 185, 129, 0.4); color: var(--green); }

/* ---- History ---- */
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.history-header h3 { font-size: 1rem; font-weight: 700; }
.history-list { display: flex; flex-direction: column; gap: 10px; min-height: 100px; }
.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  animation: fadeIn 0.3s ease;
}
.history-item:hover { border-color: rgba(168, 85, 247, 0.3); background: var(--bg-card-hover); }
.history-item img {
  width: 44px; height: 44px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(168,85,247,0.2), rgba(6,182,212,0.15));
}
.history-item-info { flex: 1; min-width: 0; }
.history-item-title { font-size: 0.88rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-item-meta { font-size: 0.75rem; color: var(--text-muted); margin-top: 1px; }
.history-item-action { flex-shrink: 0; color: var(--text-muted); }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
  text-align: center;
  color: var(--text-muted);
  gap: 8px;
}
.empty-icon { font-size: 2.5rem; margin-bottom: 4px; }
.empty-state p { font-weight: 500; font-size: 0.95rem; color: var(--text-secondary); }
.empty-state span { font-size: 0.82rem; }

/* ---- Player Bar ---- */
.player-bar {
  position: fixed;
  bottom: 0;
  left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
  border-top: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: 0;
  background: rgba(5, 6, 15, 0.85) !important;
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  animation: slideUp 0.3s ease;
}
.player-cover {
  position: relative;
  width: 48px; height: 48px;
  flex-shrink: 0;
}
.player-cover img {
  width: 48px; height: 48px;
  border-radius: 8px;
  object-fit: cover;
}
.player-visualizer {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 2px;
  padding: 4px;
  background: rgba(0,0,0,0.6);
  border-radius: 8px;
  opacity: 0;
  transition: opacity 0.2s;
}
.player-cover.playing .player-visualizer { opacity: 1; }
.player-visualizer span {
  width: 4px;
  background: var(--purple-light);
  border-radius: 2px;
  animation: visualize 0.8s ease-in-out infinite alternate;
}
.player-visualizer span:nth-child(1) { animation-delay: 0s; height: 60%; }
.player-visualizer span:nth-child(2) { animation-delay: 0.1s; height: 90%; }
.player-visualizer span:nth-child(3) { animation-delay: 0.2s; height: 50%; }
.player-visualizer span:nth-child(4) { animation-delay: 0.15s; height: 80%; }
.player-visualizer span:nth-child(5) { animation-delay: 0.05s; height: 70%; }
@keyframes visualize {
  from { height: 20%; }
  to { height: 100%; }
}
.player-info { flex: 0 0 160px; min-width: 0; }
.player-title { display: block; font-size: 0.88rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.player-tags { display: block; font-size: 0.72rem; color: var(--text-muted); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.player-controls { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.player-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: none;
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.player-btn:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.player-play {
  width: 44px; height: 44px;
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 4px 16px rgba(168,85,247,0.3);
}
.player-play:hover { transform: scale(1.05); box-shadow: 0 6px 20px rgba(168,85,247,0.45); }
.player-progress-area {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.player-time { font-size: 0.75rem; color: var(--text-muted); font-variant-numeric: tabular-nums; flex-shrink: 0; }
.player-progress-track {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  cursor: pointer;
  overflow: hidden;
  position: relative;
}
.player-progress-fill {
  height: 100%;
  background: var(--grad-main);
  border-radius: 2px;
  transition: width 0.5s linear;
  box-shadow: 0 0 6px rgba(168,85,247,0.4);
  pointer-events: none;
}
.player-extras { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.player-download { border: 1px solid var(--border); }
.player-download:hover { border-color: rgba(16, 185, 129, 0.4); color: var(--green); }

/* ---- Toast ---- */
.toast-container {
  position: fixed;
  bottom: 88px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}
.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 12px;
  background: #14151f;
  border: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  font-size: 0.85rem;
  font-weight: 500;
  max-width: 320px;
  animation: toastIn 0.3s ease;
  color: var(--text-primary);
}
.toast.success { border-color: rgba(16, 185, 129, 0.4); }
.toast.error { border-color: rgba(239, 68, 68, 0.4); }
.toast.warning { border-color: rgba(245, 158, 11, 0.4); }
.toast.info { border-color: rgba(168, 85, 247, 0.4); }
.toast-icon { font-size: 1.1rem; flex-shrink: 0; }
@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px) translateX(10px); }
  to { opacity: 1; transform: translateY(0) translateX(0); }
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .navbar { padding: 12px 16px; }
  .main-container { padding: 24px 12px; }
  .glass-panel { padding: 18px; }
  .form-row { grid-template-columns: 1fr; }
  .sliders-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
  .tabs-container { padding: 4px; }
  .tab-btn { font-size: 0.75rem; padding: 8px 10px; }
  .player-bar { padding: 10px 12px; gap: 10px; }
  .player-info { display: none; }
  .progress-stage-badges { display: none; }
}
@media (max-width: 480px) {
  .player-extras .player-download { display: none; }
}