:root {
  --bg: #0f1115;
  --card: #181b22;
  --card-subtle: #1f232c;
  --text: #e8e9ed;
  --muted: #9aa0ac;
  --accent: #4f8cff;
  --accent-2: #34d399;
  --border: #2a2e38;
  --danger: #f87171;
  --warning: #fbbf24;
}

* { box-sizing: border-box; }

html { overflow-x: hidden; }

body {
  margin: 0;
  overflow-x: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  padding: 16px 16px 0;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0 0 12px;
  font-size: 20px;
}

nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

nav::-webkit-scrollbar { display: none; }

.tab-btn {
  background: none;
  border: none;
  color: var(--muted);
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  flex-shrink: 0;
  white-space: nowrap;
}

.tab-btn.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 16px;
}

.card.subtle {
  background: var(--card-subtle);
}

.card h2 {
  margin-top: 0;
  font-size: 16px;
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
}

input, select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  background: #10131a;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
}

button.primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  width: 100%;
}

button.primary:hover { opacity: 0.9; }

button.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}

button.danger {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
}

.hidden { display: none !important; }

.exercise-block {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}

.exercise-block:first-child { border-top: none; }

.exercise-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 4px;
}

.equipment-icon {
  width: 40px;
  height: 40px;
  padding: 6px;
  flex-shrink: 0;
  background: var(--card-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.exercise-header-text { flex: 1; min-width: 0; }

.exercise-block h3 {
  margin: 0 0 2px;
  font-size: 15px;
}

.exercise-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
}

.icon-btn:hover { color: var(--text); border-color: var(--muted); }

.replace-picker {
  display: flex;
  gap: 6px;
  align-items: center;
  margin: 8px 0;
}

.replace-picker select { margin: 0; }

.add-exercise-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.add-exercise-row label { flex: 1; margin-bottom: 0; }

.add-exercise-row button { white-space: nowrap; }

/* ---------- Login page ---------- */

.login-main {
  max-width: 360px;
  margin: 0 auto;
  padding: 80px 16px;
}

.login-card { text-align: center; }

.login-card h1 { margin-top: 0; }

.google-btn {
  display: block;
  text-decoration: none;
  text-align: center;
  margin-top: 16px;
  box-sizing: border-box;
}

.login-error {
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 13px;
  margin-bottom: 12px;
}

/* ---------- Plans tab ---------- */

.plan-card.active-plan { border-color: var(--accent-2); }

.plan-card h2 {
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-badge {
  font-size: 11px;
  font-weight: 500;
  color: var(--accent-2);
  border: 1px solid var(--accent-2);
  border-radius: 999px;
  padding: 2px 8px;
}

.plan-description {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
}

.plan-days {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.plan-schedule {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 4px;
}

.plan-schedule h3 {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 8px;
  font-weight: 500;
}

.schedule-days {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.schedule-day-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}

.schedule-day-toggle input { width: auto; margin: 0; }

.schedule-summary {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
}

/* ---------- Calendar tab ---------- */

.calendar-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.calendar-nav h2 { margin: 0; font-size: 16px; }
.calendar-nav button { padding: 6px 14px; }

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  margin-bottom: 6px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}

.calendar-day {
  aspect-ratio: 1;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 12px;
  color: var(--muted);
  background: var(--card-subtle);
}

.calendar-day.empty { border: none; background: none; }

.calendar-day .day-number { font-size: 11px; }
.calendar-day .day-icon { font-size: 16px; line-height: 1; }

.calendar-day.done {
  background: rgba(52, 211, 153, 0.15);
  border-color: var(--accent-2);
  color: var(--text);
}

.calendar-day.missed {
  background: rgba(248, 113, 113, 0.12);
  border-color: var(--danger);
  color: var(--text);
}

.calendar-day.planned {
  background: rgba(251, 191, 36, 0.15);
  border-color: var(--warning);
  color: var(--text);
}

.calendar-day.rest {
  background: var(--card-subtle);
  border-color: var(--border);
  color: var(--muted);
}

.calendar-day.today { box-shadow: 0 0 0 2px var(--accent) inset; }

.calendar-day.clickable { cursor: pointer; }
.calendar-day.clickable:hover { filter: brightness(1.15); }

.calendar-legend {
  display: flex;
  gap: 16px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
}

.calendar-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-right: 4px;
  vertical-align: middle;
}

.calendar-swatch.done { background: var(--accent-2); }
.calendar-swatch.planned { background: var(--warning); }
.calendar-swatch.missed { background: var(--danger); }
.calendar-swatch.rest { background: var(--muted); }

/* ---------- Modal ---------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.modal-overlay.hidden { display: none; }

.modal-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 15px;
  cursor: pointer;
  width: 28px;
  height: 28px;
}

.modal-close:hover { color: var(--text); }

/* ---------- Settings tab ---------- */

.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-top: 1px solid var(--border);
}

.settings-row:first-child { border-top: none; }

/* ---------- Weekly progress ---------- */

.week-bar {
  height: 10px;
  background: var(--card-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.week-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: width 0.3s ease;
}

.week-bar-label {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

.week-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.week-chip {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.week-chip.done {
  color: var(--accent-2);
  border-color: var(--accent-2);
}

.week-stat {
  margin-top: 10px;
  font-size: 14px;
  font-weight: 600;
}

.exercise-target {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

.exercise-note {
  font-size: 12px;
  color: var(--accent-2);
  margin-bottom: 8px;
}

.exercise-previous {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

.set-row {
  display: grid;
  grid-template-columns: 28px 1fr 1fr;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}

.set-row span {
  color: var(--muted);
  font-size: 13px;
}

.session-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}

.session-head span {
  color: var(--muted);
  font-size: 13px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-top: 1px solid var(--border);
  cursor: pointer;
}

.history-item:first-child { border-top: none; }

.history-item .meta { color: var(--muted); font-size: 13px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 10px;
}

th, td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}

th { color: var(--muted); font-weight: 500; }

/* Wide tables scroll inside their own box rather than the whole page */
#progress-table, #stats-table, #session-detail-body, #modal-body {
  overflow-x: auto;
}

/* ---------- Responsive ---------- */

@media (max-width: 480px) {
  main { padding: 16px 12px 50px; }
  .card { padding: 14px; }

  .calendar-weekdays, .calendar-grid { gap: 4px; }
  .calendar-day { font-size: 10px; }
  .calendar-day .day-number { font-size: 9px; }
  .calendar-day .day-icon { font-size: 13px; }

  .add-exercise-row { flex-direction: column; align-items: stretch; }
  .add-exercise-row button { width: 100%; }

  .set-row { grid-template-columns: 22px 1fr 1fr; gap: 6px; }

  .login-main { padding: 48px 16px; }
}

@media (min-width: 900px) {
  main { max-width: 960px; }

  #plans-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
    align-items: start;
  }
  #plans-list .plan-card { margin-bottom: 0; }

  #tab-calendar .card:first-child {
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
  }
}