:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-hover: #243044;
  --border: #2d3a4d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --radius: 8px;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

nav.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  background: var(--surface);
  padding: 0.25rem;
  border-radius: var(--radius);
  overflow-x: scroll;
}

nav.tabs .tab {
  flex: 1;
  padding: 0.6rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}

nav.tabs .tab:hover {
  color: var(--text);
  background: var(--surface-hover);
}

nav.tabs .tab.active {
  background: var(--accent);
  color: #fff;
}

main {
  min-height: 320px;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.panel h2 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.field label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.field .scale-row,
.field .radio-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.field .scale-row input[type="range"] {
  flex: 1;
  min-width: 120px;
}

.field .scale-row span {
  min-width: 1.5rem;
  font-weight: 600;
  color: var(--accent);
}

input[type="number"],
input[type="text"],
textarea {
  width: 100%;
  max-width: 280px;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

textarea {
  resize: vertical;
  min-height: 60px;
}

.radio-row label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0;
  font-weight: 400;
  cursor: pointer;
}

input[type="radio"] {
  accent-color: var(--accent);
}

.btn {
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  align-self: flex-start;
}

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

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
}

/* Overview */
.overview-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.overview-controls label {
  font-weight: 500;
}

.overview-controls select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
}

.month-year-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.5rem;
}

.month-year-controls[aria-hidden="true"] {
  display: none;
}

.charts {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.chart-container {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}

.chart-container-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem;
  border: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  text-align: left;
  transition: background 0.15s, color 0.15s;
}

.chart-container-header:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.chart-container-title {
  flex: 1;
}

.chart-container-chevron {
  flex-shrink: 0;
  width: 0.6rem;
  height: 0.6rem;
  margin-left: 0.5rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s;
}

.chart-container.collapsed .chart-container-chevron {
  transform: rotate(-135deg);
}

.chart-container-body {
  padding: 0.5rem 1rem 1rem 1rem;
}

.chart-container.collapsed .chart-container-body {
  display: none;
}

.chart-container-body > .chart-toggles:first-child {
  margin-top: 0;
}

.chart-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.chart-toggles label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
  cursor: pointer;
}

.chart-toggles input[type="checkbox"] {
  accent-color: var(--accent);
}

.chart-container canvas {
  max-height: 220px;
}

/* Activity calendar (exercises & workout) */
.activity-calendar {
  overflow-x: auto;
}

.activity-calendar table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.activity-calendar th,
.activity-calendar td {
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border);
  text-align: center;
}

.activity-calendar th {
  background: var(--surface-hover);
  color: var(--text-muted);
  font-weight: 500;
}

.activity-calendar td.exercises-yes { color: var(--success); }
.activity-calendar td.exercises-no { color: var(--text-muted); }
.activity-calendar td.workout-boxing { color: var(--accent); }
.activity-calendar td.workout-pilates { color: #a371f7; }
.activity-calendar td.workout-boxing-pilates { color: #d29922; }
.activity-calendar td.workout-other { color: #39c5cf; }
.activity-calendar td.workout-none { color: var(--text-muted); }

.activity-calendar td.activity-notes {
  max-width: 12rem;
  text-align: left;
  white-space: normal;
  word-break: break-word;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.summary-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 2rem;
}

.summary-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.summary-card h4 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.summary-card .value {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
}

/* Toast / feedback */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.25rem;
  background: var(--success);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  box-shadow: var(--shadow);
  z-index: 100;
  animation: fadeInUp 0.25s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* Auth gate */
.auth-gate {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  z-index: 1000;
}

.auth-gate.hidden {
  display: none;
}

.auth-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  max-width: 320px;
  box-shadow: var(--shadow);
}

.auth-box h2 {
  margin: 0 0 1.5rem;
  font-size: 1.25rem;
  text-align: center;
}

#auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#auth-password {
  width: 100%;
  max-width: none;
  padding: 0.75rem 1rem;
  font-size: 1rem;
}

#auth-form .btn {
  width: 100%;
  padding: 0.75rem;
}

.auth-error {
  margin: 1rem 0 0;
  text-align: center;
  color: var(--danger);
  font-size: 0.9rem;
}

.app.locked {
  display: none;
}