:root {
  --bg: #0f0f13;
  --bg-soft: #15151f;
  --card: #1a1a25;
  --card-hover: #20202d;
  --border: #2e2e3e;
  --border-strong: #3a3a4e;
  --text: #e2e2e8;
  --text-dim: #8b8ba0;
  --text-faint: #55556a;
  --accent: #a78bfa;
  --accent-light: #c9b3ff;
  --accent-bg: #2a2640;
  --danger: #ff8b8b;
  --tap: 56px;
  --radius: 12px;
}

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

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

button { font: inherit; }

main {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
}

.view { flex: 1; display: flex; flex-direction: column; }
.view[hidden] { display: none; }

/* ===== Setup view ===== */
#setup-view {
  padding: max(20px, env(safe-area-inset-top)) 16px calc(96px + env(safe-area-inset-bottom));
  gap: 18px;
}

.app-header { padding: 12px 4px 4px; }

.app-header h1 {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.app-header h1::before {
  content: "▸";
  color: var(--accent);
  margin-right: 8px;
  font-weight: 400;
}

.app-header .tagline {
  color: var(--text-faint);
  font-size: 0.85rem;
  margin-top: 2px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.card-header h2 {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-faint);
}

.meta { color: var(--text-faint); font-size: 0.78rem; margin-left: auto; font-variant-numeric: tabular-nums; }
.meta-tail { color: var(--text-faint); font-size: 0.85rem; }

.empty-hint {
  color: var(--text-faint);
  font-size: 0.85rem;
  font-style: italic;
  padding: 10px 4px 14px;
}

/* ===== Library ===== */
.library-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.library-list:empty { display: none; }

.library-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 48px;
}

.library-row .name {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.library-row .duration {
  color: var(--text-faint);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.library-row .icon-btn {
  background: transparent;
  border: none;
  color: var(--text-faint);
  width: 36px;
  height: 36px;
  font-size: 1.1rem;
  cursor: pointer;
  border-radius: 6px;
  flex-shrink: 0;
}

.library-row .icon-btn:hover, .library-row .icon-btn:active {
  color: var(--danger);
  background: rgba(255,139,139,0.08);
}

/* ===== Phases editor ===== */
.phases-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.phase-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 76px auto;
  gap: 6px;
  align-items: center;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.phase-row .label-input,
.phase-row .duration-input {
  font: inherit;
  font-size: 0.95rem;
  padding: 10px 10px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  min-height: 42px;
  width: 100%;
}

.phase-row .label-input:focus,
.phase-row .duration-input:focus,
.repeat-row input:focus {
  border-color: var(--accent);
}

.phase-row .duration-input {
  font-variant-numeric: tabular-nums;
  text-align: center;
  padding: 10px 4px;
}

.phase-actions {
  display: flex;
  gap: 2px;
}

.phase-actions .icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  width: 32px;
  height: 32px;
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: 6px;
  line-height: 1;
}

.phase-actions .icon-btn:hover:not(:disabled) {
  color: var(--accent);
  background: rgba(167,139,250,0.08);
}

.phase-actions .icon-btn:disabled {
  opacity: 0.3;
  pointer-events: none;
}

.phase-actions .delete:hover {
  color: var(--danger);
  background: rgba(255,139,139,0.08);
}

/* ===== Repeat row ===== */
.repeat-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0 4px;
  margin-top: 10px;
  border-top: 1px solid var(--border);
}

.repeat-row label {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.repeat-row input {
  font: inherit;
  font-size: 0.95rem;
  padding: 9px 10px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  width: 70px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ===== Settings ===== */
.settings {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.settings summary {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  cursor: pointer;
  padding: 8px 0;
  list-style: none;
  user-select: none;
}

.settings summary::-webkit-details-marker { display: none; }

.settings summary::before {
  content: "▸";
  display: inline-block;
  color: var(--text-faint);
  margin-right: 6px;
  transition: transform 0.15s;
}

.settings[open] summary::before { transform: rotate(90deg); }

.setting-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.setting-row > span:first-child { flex: 1; }

.setting-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  max-width: 130px;
}

.setting-row input[type="checkbox"] {
  width: 22px;
  height: 22px;
  accent-color: var(--accent);
  cursor: pointer;
}

.setting-value {
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
  font-size: 0.82rem;
  min-width: 36px;
  text-align: right;
}

/* ===== Buttons ===== */
.btn {
  font-size: 0.92rem;
  font-weight: 600;
  padding: 14px 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s, transform 0.08s;
  user-select: none;
  text-align: center;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap);
}

.btn:active { transform: scale(0.98); }

.btn-secondary {
  background: transparent;
  color: var(--accent-light);
  border-color: var(--border-strong);
  width: 100%;
}

.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-primary {
  background: var(--accent-bg);
  color: var(--accent-light);
  border-color: var(--accent);
}

.btn-primary:hover { background: #3a2f5a; color: white; }

.btn-primary:disabled {
  background: var(--card);
  color: var(--text-faint);
  border-color: var(--border);
  cursor: not-allowed;
}

.btn-fab {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: calc(16px + env(safe-area-inset-bottom));
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--accent);
  color: var(--bg);
  border: none;
  height: 60px;
  box-shadow: 0 8px 28px rgba(167,139,250,0.28);
  z-index: 10;
}

.btn-fab:disabled {
  background: var(--border);
  color: var(--text-faint);
  box-shadow: none;
  cursor: not-allowed;
}

.btn-fab:hover:not(:disabled) { background: var(--accent-light); }

/* ===== Workout view ===== */
#workout-view {
  background: radial-gradient(ellipse at top, var(--bg-soft) 0%, var(--bg) 70%);
  padding: max(16px, env(safe-area-inset-top)) 16px calc(20px + env(safe-area-inset-bottom));
  min-height: 100dvh;
}

.workout-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 0 24px;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.05rem;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover, .btn-icon:active {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-icon:active { transform: scale(0.96); }

.round-meta {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.round-meta span {
  color: var(--accent-light);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.workout-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 16px 0;
}

.phase-label {
  font-size: clamp(2.4rem, 14vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--accent);
  text-align: center;
  line-height: 1;
  text-transform: uppercase;
  transition: color 0.3s;
}

.countdown {
  font-size: clamp(4.5rem, 28vw, 9rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  letter-spacing: -0.04em;
  line-height: 1;
}

.track-name {
  color: var(--text-faint);
  font-size: 0.88rem;
  text-align: center;
  max-width: 90%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0 8px;
}

.workout-controls {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 16px 0 8px;
}

.workout-controls .btn-icon {
  background: var(--card);
  border-color: var(--border-strong);
  color: var(--text);
  width: 56px;
  height: 56px;
  font-size: 1.2rem;
}

.workout-controls .btn-primary {
  flex: 1;
  height: 56px;
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

body.paused .countdown { opacity: 0.45; }
body.paused .phase-label { color: var(--text-dim); }

/* ===== Toast ===== */
.toast {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: calc(86px + env(safe-area-inset-bottom));
  background: var(--card);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  z-index: 20;
  box-shadow: 0 4px 18px rgba(0,0,0,0.45);
  animation: toast-in 0.2s ease-out;
}

.toast.error { border-color: var(--danger); }
.toast[hidden] { display: none; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Tablet/desktop centering ===== */
@media (min-width: 700px) {
  main { max-width: 600px; margin: 0 auto; }
  .btn-fab,
  .toast {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: calc(100% - 32px);
    max-width: 568px;
  }
  .btn-fab:active { transform: translateX(-50%) scale(0.98); }
}