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

:root {
  --bg: #050505;
  --surface: #111;
  --border: #1a1a1a;
  --text-1: #fff;
  --text-2: #777;
  --text-3: #444;
  --accent: #fff;
  --spotify: #1db954;
}

[data-workout="running"] { --accent: #ff6b00; }
[data-workout="strength"] { --accent: #3b82f6; }
[data-workout="cycling"] { --accent: #ffea00; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter",
    "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text-1);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 24px 120px;
}

/* ── Header ── */

.header {
  padding: 80px 0 56px;
}

.header h1 {
  font-size: 56px;
  font-weight: 900;
  letter-spacing: -3px;
  line-height: 1;
}

.header p {
  font-size: 13px;
  color: var(--text-3);
  margin-top: 12px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  font-weight: 500;
}

/* ── Spotify Connect ── */

.connect-section {
  margin-bottom: 56px;
}

.connect-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 12px 28px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.2s ease;
}

.connect-btn:hover {
  border-color: #333;
  color: var(--text-1);
}

.connect-btn .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-3);
  transition: background 0.2s;
}

.connected .dot {
  background: var(--spotify);
}

.connected {
  border-color: transparent;
  color: var(--text-2);
  cursor: default;
}

.taste-summary {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.6;
}

/* ── Sections ── */

.section {
  margin-bottom: 48px;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 12px;
  color: var(--text-3);
  margin-top: -12px;
  margin-bottom: 16px;
}

/* ── Workout Type ── */

.type-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.type-btn {
  background: none;
  border: none;
  padding: 10px 20px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-3);
  cursor: pointer;
  transition: color 0.2s ease;
  position: relative;
}

.type-btn:first-child {
  padding-left: 0;
}

.type-btn:hover {
  color: var(--text-2);
}

.type-btn.active {
  color: var(--accent);
}

.type-btn.active::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 20px;
  right: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.type-btn:first-child.active::after {
  left: 0;
}

/* ── Duration ── */

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

.dur-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-3);
  cursor: pointer;
  transition: all 0.2s ease;
}

.dur-btn:hover {
  border-color: #333;
  color: var(--text-2);
}

.dur-btn.active {
  border-color: var(--accent);
  color: var(--accent);
}

.dur-custom {
  width: 80px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  text-align: center;
  outline: none;
  transition: border-color 0.2s;
}

.dur-custom:focus {
  border-color: var(--accent);
}

.dur-custom::placeholder {
  color: var(--text-3);
  font-weight: 400;
  font-size: 13px;
}

.dur-custom-unit {
  font-size: 13px;
  color: var(--text-3);
  margin-left: -4px;
}

/* ── Speed Input ── */

.speed-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── Generate ── */

.generate-btn {
  width: 100%;
  padding: 18px;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  background: var(--accent);
  color: #000;
  transition: opacity 0.2s ease, transform 0.15s ease;
}

.generate-btn:hover {
  opacity: 0.85;
}

.generate-btn:active {
  transform: scale(0.985);
}

.generate-btn:disabled {
  background: var(--text-3);
  opacity: 0.3;
  cursor: default;
  transform: none;
}

/* ── Loading ── */

.loading {
  display: none;
  padding: 120px 0;
  text-align: center;
}

.loading.visible {
  display: block;
}

.loader {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 20px;
}

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

.loading p {
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ── Results ── */

.results {
  display: none;
}

.results.visible {
  display: block;
  animation: fadeUp 0.4s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.plan-title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  margin-bottom: 8px;
}

.plan-meta {
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 56px;
}

/* ── Phase ── */

.phase {
  margin-bottom: 48px;
}

.phase-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 6px;
}

.phase-name {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-2);
}

.phase-name-zh {
  font-size: 11px;
  color: var(--text-3);
  margin-left: 2px;
}

.phase-bpm {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.phase-time {
  font-size: 12px;
  color: var(--text-3);
}

.phase-line {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin: 8px 0 20px;
}

/* Warm Up / Cool Down have muted accent */
.phase.aux .phase-bpm {
  color: var(--text-2);
}

.phase-divider {
  text-align: center;
  padding: 24px 0;
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* ── Song ── */

.song {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
  transition: opacity 0.15s ease;
}

.song:hover {
  opacity: 0.7;
}

.song-art {
  width: 44px;
  height: 44px;
  border-radius: 4px;
  object-fit: cover;
  background: var(--surface);
  flex-shrink: 0;
}

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

.song-name {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-artist {
  font-size: 13px;
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-bpm {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
  flex-shrink: 0;
  min-width: 52px;
  text-align: right;
}

.phase.aux .song-bpm {
  color: var(--text-2);
}

.song-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.song:hover .song-actions {
  opacity: 1;
}

.song-link {
  color: var(--text-3);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  transition: color 0.15s;
}

.song-link:hover {
  color: var(--spotify);
}

.song-remove {
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  font-size: 16px;
  padding: 2px;
  line-height: 1;
  transition: color 0.15s;
}

.song-remove:hover {
  color: #e03131;
}

.phase-footer {
  margin-top: 12px;
}

.refresh-btn {
  background: none;
  border: none;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-3);
  cursor: pointer;
  padding: 6px 0;
  letter-spacing: 0.5px;
  transition: color 0.15s;
}

.refresh-btn:hover {
  color: var(--text-2);
}

.refresh-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

/* ── Bottom ── */

.actions {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.save-btn {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  background: var(--spotify);
  color: #000;
  transition: opacity 0.2s ease;
}

.save-btn:hover {
  opacity: 0.85;
}

.save-btn:disabled {
  opacity: 0.25;
  cursor: default;
}

.restart-btn {
  width: 100%;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: none;
  color: var(--text-3);
  transition: all 0.2s ease;
}

.restart-btn:hover {
  border-color: #333;
  color: var(--text-2);
}

.success {
  display: none;
  text-align: center;
  padding: 20px;
  margin-top: 12px;
}

.success.visible {
  display: block;
  animation: fadeUp 0.3s ease;
}

.success p {
  font-size: 14px;
  color: var(--text-2);
}

.success a {
  color: var(--spotify);
  text-decoration: none;
  font-weight: 600;
}

.success a:hover {
  text-decoration: underline;
}

/* ── Footer ── */

.footer {
  text-align: center;
  padding: 64px 0 24px;
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.5px;
}

.footer a {
  color: var(--text-3);
  text-decoration: none;
}

.footer a:hover {
  color: var(--text-2);
}

/* ── Responsive ── */

@media (max-width: 520px) {
  .header { padding: 48px 0 40px; }
  .header h1 { font-size: 40px; letter-spacing: -2px; }
  .type-btn { padding: 8px 14px; font-size: 15px; }
  .dur-row { gap: 8px; }
  .dur-btn { padding: 10px 16px; font-size: 14px; }
  .plan-title { font-size: 28px; }
}