:root {
  --bg: #0f1115;
  --surface: #1a1d24;
  --surface-2: #23272f;
  --border: #2e333d;
  --text: #f0f1f3;
  --text-dim: #9aa0ab;
  --accent: #4f8cff;
  --accent-dim: #2d4b8a;
  --good: #3ecf8e;
  --warn: #e8b339;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding-bottom: 3rem;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.topbar h1 {
  font-size: 1.15rem;
  margin: 0;
  font-weight: 600;
  flex: 1;
}

.unit-toggle-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-transform: uppercase;
}

.icon-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  width: 2.25rem;
  height: 2.25rem;
  font-size: 1.1rem;
  cursor: pointer;
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.25rem;
}

.menu {
  display: grid;
  gap: 0.9rem;
  margin-top: 0.5rem;
}

.menu-btn {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  font-size: 1.05rem;
  text-align: left;
  cursor: pointer;
}

.menu-btn:active { background: var(--surface-2); }

.menu-icon {
  font-size: 1.4rem;
  width: 2rem;
  text-align: center;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.form { display: grid; gap: 1rem; }

.form label,
.field-label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.field-label input,
.field-label textarea {
  width: 100%;
}

input, select, textarea {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
}

.primary-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 0.85rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.25rem;
}

.primary-btn:active { background: var(--accent-dim); }

.secondary-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.7rem;
  font-size: 0.95rem;
  cursor: pointer;
}

.danger-btn {
  background: transparent;
  border: 1px solid #7a3535;
  color: #ff8383;
  border-radius: 10px;
  padding: 0.7rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 2.5rem 1rem;
  line-height: 1.5;
}

.pill {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.exercise-card { margin-bottom: 1rem; }

.exercise-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  cursor: pointer;
  user-select: none;
}

.exercise-header-main {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  min-width: 0;
}

.exercise-header-main h3 {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exercise-header-status {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.completion-badge {
  font-size: 0.75rem;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
}

.completion-badge.done {
  color: var(--good);
  border-color: var(--good);
}

.collapse-chevron {
  color: var(--text-dim);
  font-size: 0.75rem;
  width: 1rem;
  text-align: center;
}

.exercise-header h3 { margin: 0; font-size: 1.05rem; }
.exercise-meta { font-size: 0.8rem; color: var(--text-dim); }

.set-row {
  display: grid;
  grid-template-columns: 1.6rem 1fr 1fr 1.8rem;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}

.set-row .set-label {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.set-row input { width: 100%; text-align: center; }

.remove-set-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 8px;
  width: 1.8rem;
  height: 1.8rem;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

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

.add-set-btn {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-dim);
  border-radius: 8px;
  padding: 0.5rem;
  width: 100%;
  font-size: 0.85rem;
  cursor: pointer;
  margin-top: 0.25rem;
  margin-bottom: 1rem;
}

.exercise-comment {
  margin-top: 0.75rem;
  width: 100%;
  min-height: 3.2rem;
  resize: vertical;
}

.exercise-actions {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.text-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.25rem 0;
}

.text-btn.danger-text-btn {
  color: #ff8383;
}

.increase-weight-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.increase-weight-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}

.workout-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.workout-summary h2 { margin: 0 0 0.15rem 0; }

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.history-item {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

.history-item:last-child { border-bottom: none; }

.history-item summary {
  cursor: pointer;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
}

.history-exercise {
  margin-top: 0.75rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--border);
}

.increase-flag {
  color: var(--good);
}

.history-sets {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.stat-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
}

.stat-box .value { font-size: 1.6rem; font-weight: 700; }
.stat-box .label { font-size: 0.8rem; color: var(--text-dim); margin-top: 0.25rem; }

.chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.chart-wrap h3 { margin: 0 0 0.75rem 0; font-size: 0.95rem; }

.pending-box {
  text-align: left;
  padding: 2rem 1rem;
}

.pending-box > p:first-child,
.pending-box > .pill {
  text-align: center;
  display: block;
}

.pending-box p {
  line-height: 1.6;
  color: var(--text-dim);
}

.login-landing {
  margin-top: 3rem;
}

.login-hero {
  text-align: center;
  margin-bottom: 1.5rem;
}

.login-hero h2 {
  margin: 0.25rem 0;
  font-size: 1.6rem;
}

.login-logo {
  font-size: 2.5rem;
}

.login-error {
  color: #ff8383;
  font-size: 0.85rem;
  margin: 0;
}

.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 100;
}

.confirm-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  max-width: 22rem;
  width: 100%;
}

.confirm-box p {
  margin: 0 0 1rem 0;
  line-height: 1.5;
}