:root {
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-background: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #cbd5e1;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-success: #16a34a;
  --color-success-bg: #f0fdf4;
  --color-success-border: #bbf7d0;
  --color-focus: #6366f1;
  --font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --max-width: 640px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --radius: 0.5rem;
}

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

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

header h1 {
  margin: 0;
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.subtitle {
  margin: var(--spacing-xs) 0 0;
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

main {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 var(--spacing-md) var(--spacing-xl);
}

form,
.login-form {
  background: var(--color-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.login-form {
  max-width: 360px;
  margin: var(--spacing-xl) auto 0;
}

.login-form input[type="password"] {
  width: 100%;
  padding: var(--spacing-sm) 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-surface);
}

.login-form input[type="password"]:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
  border-color: var(--color-focus);
}

.login-form button[type="submit"] {
  display: block;
  width: 100%;
  margin-top: var(--spacing-md);
  padding: 0.75rem var(--spacing-lg);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}

.login-form button[type="submit"]:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.login-form .error-output {
  margin-top: var(--spacing-md);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.helper-text {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

textarea,
input[type="text"] {
  width: 100%;
  padding: var(--spacing-sm) 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.15s ease;
}

textarea {
  resize: vertical;
}

textarea:focus,
input[type="text"]:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
  border-color: var(--color-focus);
}

textarea.error,
input[type="text"].error {
  border-color: var(--color-error);
  background-color: var(--color-error-bg);
}

textarea.error:focus,
input[type="text"].error:focus {
  outline-color: var(--color-error);
  border-color: var(--color-error);
}

.error-message {
  display: block;
  min-height: 1.25rem;
  font-size: 0.875rem;
  color: var(--color-error);
  margin-top: var(--spacing-xs);
}

button[type="submit"] {
  display: block;
  width: 100%;
  padding: 0.75rem var(--spacing-lg);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

button[type="submit"]:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

button[type="submit"]:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

button[type="submit"]:disabled {
  background-color: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.success-message {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
  border-radius: var(--radius);
  text-align: center;
}

.success-message p {
  margin: 0;
  color: var(--color-success);
  font-weight: 500;
}

.loading {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.loading p {
  margin: var(--spacing-md) 0 0;
  color: var(--color-text-muted);
  font-weight: 500;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  margin: 0 auto;
  animation: spin 0.8s linear infinite;
}

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

.song-output {
  background: var(--color-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  white-space: pre-wrap;
  line-height: 1.7;
  font-size: 1.05rem;
}

.error-output {
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius);
  color: var(--color-error);
  text-align: center;
  font-weight: 500;
}

.secondary-btn {
  display: block;
  width: 100%;
  margin-top: var(--spacing-lg);
  padding: 0.75rem var(--spacing-lg);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  background: transparent;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.secondary-btn:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.secondary-btn:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.progress-steps {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.step {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 999px;
  border: 1px solid var(--color-border);
  transition: all 0.2s ease;
}

.step.active {
  color: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 600;
}

.step.done {
  color: var(--color-success);
  border-color: var(--color-success);
}

#audio-player {
  margin-top: var(--spacing-lg);
  text-align: center;
}

#audio-player audio {
  width: 100%;
  border-radius: var(--radius);
}

.download-btn {
  display: inline-block;
  width: auto;
  margin-top: var(--spacing-md);
  text-decoration: none;
  text-align: center;
}

.input-with-button {
  display: flex;
  gap: var(--spacing-sm);
}

.input-with-button input[type="text"] {
  flex: 1;
}

.shuffle-btn {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  font-size: 1.2rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.shuffle-btn:hover {
  border-color: var(--color-primary);
  background-color: var(--color-background);
}

.shuffle-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Navigation */
nav {
  margin-top: var(--spacing-sm);
}

.nav-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-link:hover {
  text-decoration: underline;
}

/* Announce (MC intro) */
.announce-btn {
  display: block;
  width: 100%;
  padding: 0.75rem var(--spacing-lg);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  margin-top: var(--spacing-lg);
  transition: background-color 0.15s ease;
}

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

.announce-btn:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.announce-btn:disabled {
  background-color: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.announce-help {
  text-align: center;
  margin-top: var(--spacing-sm);
}

.share-row {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.share-input {
  flex: 1;
}

/* Result actions */
.result-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.result-actions .secondary-btn {
  flex: 1;
  margin-top: 0;
}

.playlist-add-btn:hover {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: #ffffff;
}

/* Playlist */
.playlist {
  list-style: none;
  padding: 0;
  margin: 0;
}

.playlist-item {
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: opacity 0.2s ease, box-shadow 0.2s ease;
}

.playlist-item.playing {
  box-shadow: 0 0 0 2px var(--color-primary);
}

.playlist-item.dragging {
  opacity: 0.4;
}

.playlist-item.drag-over {
  box-shadow: 0 -3px 0 0 var(--color-primary);
}

.drag-handle {
  cursor: grab;
  color: var(--color-text-muted);
  font-size: 1.2rem;
  user-select: none;
  padding: 0 var(--spacing-xs);
}

.drag-handle:active {
  cursor: grabbing;
}

.play-btn {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--color-background);
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.play-btn:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.play-btn.active {
  background-color: var(--color-primary);
  color: #ffffff;
}

.song-title-input {
  flex: 1;
  min-width: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  background: transparent;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.song-title-input:hover {
  background-color: var(--color-background);
}

.song-title-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: var(--color-surface);
}

.delete-btn {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.delete-btn:hover {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}

.playlist-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
}

.playlist-item.expanded {
  background-color: var(--color-background);
}

.section-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.section-toggle {
  padding: 2px var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-family);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.section-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.section-toggle.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.song-detail {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-background);
  border-top: 1px solid var(--color-border);
  border-radius: var(--radius);
  max-height: 300px;
  overflow-y: auto;
}

.song-detail-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.song-detail-content {
  white-space: pre-wrap;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.song-lyrics {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius) var(--radius);
  white-space: pre-wrap;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  max-height: 300px;
  overflow-y: auto;
}

.playlist-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: var(--spacing-xl);
  font-size: 1.05rem;
}

/* Trash section */
.trash-section {
  margin-top: var(--spacing-xl);
}

.trash-section summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  padding: var(--spacing-sm) 0;
  user-select: none;
}

.trash-section summary:hover {
  color: var(--color-text);
}

.trash-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  opacity: 0.6;
}

.trash-item:hover {
  opacity: 1;
}

.trash-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 1rem;
  color: var(--color-text);
  padding: 0 var(--spacing-sm);
}

.restore-btn {
  flex-shrink: 0;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-success);
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-success);
  font-family: var(--font-family);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.restore-btn:hover {
  background-color: var(--color-success);
  color: #ffffff;
}

.permanent-delete-btn {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.permanent-delete-btn:hover {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}

[hidden] {
  display: none !important;
}

@media (min-width: 480px) {
  header {
    padding-top: 3rem;
  }

  form {
    padding: var(--spacing-xl);
  }
}