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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #e0e0e0;
  min-height: 100vh;
}

/* Login */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-box {
  background: #181818;
  border-radius: 12px;
  padding: 40px;
  width: 360px;
  text-align: center;
}

.login-box h1 {
  color: #1db954;
  font-size: 28px;
  margin-bottom: 24px;
}

.login-box input {
  width: 100%;
  padding: 12px 16px;
  margin-bottom: 12px;
  border: 1px solid #333;
  border-radius: 8px;
  background: #282828;
  color: #fff;
  font-size: 14px;
  outline: none;
}

.login-box input:focus { border-color: #1db954; }

.login-box button {
  width: 100%;
  padding: 12px;
  background: #1db954;
  color: #000;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 8px;
}

.login-box button:hover { background: #1ed760; }

.login-error {
  color: #e74c3c;
  margin-top: 12px;
  font-size: 14px;
  display: none;
}

/* App */
.app-container { display: none; }

.header {
  background: #181818;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #282828;
}

.header h1 {
  color: #1db954;
  font-size: 22px;
}

.btn-logout {
  background: transparent;
  border: 1px solid #555;
  color: #aaa;
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 13px;
}

.btn-logout:hover { border-color: #fff; color: #fff; }

/* Search */
.search-section {
  max-width: 700px;
  margin: 32px auto;
  padding: 0 24px;
}

.search-row {
  display: flex;
  gap: 12px;
}

.search-row input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid #333;
  border-radius: 8px;
  background: #282828;
  color: #fff;
  font-size: 15px;
  outline: none;
}

.search-row input:focus { border-color: #1db954; }

.btn-search {
  padding: 12px 24px;
  background: #1db954;
  color: #000;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 15px;
  white-space: nowrap;
}

.btn-search:hover { background: #1ed760; }
.btn-search:disabled { background: #555; cursor: not-allowed; }

.search-hint {
  color: #888;
  font-size: 12px;
  margin-top: 8px;
}

/* Album preview */
.album-section {
  display: none;
  max-width: 800px;
  margin: 0 auto 32px;
  padding: 0 24px;
}

.album-card {
  background: #181818;
  border-radius: 12px;
  overflow: hidden;
}

.album-header {
  display: flex;
  gap: 24px;
  padding: 24px;
}

.album-cover {
  width: 200px;
  height: 200px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
}

.album-info { flex: 1; }

.album-info h2 {
  font-size: 24px;
  color: #fff;
  margin-bottom: 4px;
}

.album-info .artist {
  color: #1db954;
  font-size: 16px;
  margin-bottom: 12px;
}

.album-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.album-meta span {
  background: #282828;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  color: #b3b3b3;
}

.tracks-list {
  padding: 0 24px 24px;
  columns: 2;
  column-gap: 24px;
}

.track-item {
  padding: 6px 0;
  font-size: 14px;
  color: #b3b3b3;
  break-inside: avoid;
}

.track-item .track-number {
  color: #666;
  margin-right: 8px;
  display: inline-block;
  width: 24px;
  text-align: right;
}

.track-item .track-duration {
  float: right;
  color: #666;
}

/* Controls & Preview */
.generate-section {
  display: none;
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.generate-layout {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.controls-panel {
  width: 300px;
  flex-shrink: 0;
  background: #181818;
  border-radius: 12px;
  padding: 24px;
}

.controls-panel h3 {
  margin-bottom: 20px;
  color: #fff;
  font-size: 18px;
}

.control-group {
  margin-bottom: 16px;
}

.control-group label {
  display: block;
  font-size: 13px;
  color: #b3b3b3;
  margin-bottom: 6px;
}

.control-group input[type="color"] {
  width: 48px;
  height: 32px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: transparent;
}

.control-group input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #333;
  border-radius: 6px;
  background: #282828;
  color: #fff;
  font-size: 14px;
  outline: none;
}

.control-group input[type="number"]:focus { border-color: #1db954; }

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-group input[type="checkbox"] {
  accent-color: #1db954;
  width: 16px;
  height: 16px;
}

.btn-generate {
  width: 100%;
  padding: 12px;
  background: #1db954;
  color: #000;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 15px;
  margin-top: 16px;
}

.btn-generate:hover { background: #1ed760; }
.btn-generate:disabled { background: #555; cursor: not-allowed; }

.btn-download {
  width: 100%;
  padding: 12px;
  background: transparent;
  color: #1db954;
  border: 2px solid #1db954;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 15px;
  margin-top: 8px;
  display: none;
}

.btn-download:hover { background: #1db954; color: #000; }

.preview-panel {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.preview-panel img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.preview-placeholder {
  color: #555;
  font-size: 16px;
  text-align: center;
  padding: 120px 0;
}

/* Loading */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #000;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}

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

/* Responsive */
@media (max-width: 768px) {
  .album-header { flex-direction: column; align-items: center; text-align: center; }
  .tracks-list { columns: 1; }
  .generate-layout { flex-direction: column; }
  .controls-panel { width: 100%; }
}