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

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #475569;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.card {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

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

.card-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.card-content {
  padding: 1.5rem;
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background-color 0.2s;
}

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

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

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

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

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

.badge {
  background-color: var(--bg-card);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.loading {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.error {
  color: var(--danger);
  padding: 1rem;
  background-color: rgba(239, 68, 68, 0.1);
  border-radius: 6px;
}

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 2rem;
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group input::placeholder {
  color: var(--text-secondary);
}

.form-help {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.form-help a {
  color: var(--accent);
  text-decoration: none;
}

.form-help a:hover {
  text-decoration: underline;
}

/* Header with logout button */
header {
  position: relative;
}

header .btn-secondary {
  position: absolute;
  top: 0;
  right: 0;
}

/* Card footer */
.card-footer {
  padding: 0.75rem 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.cache-status {
  color: var(--text-secondary);
}

/* Activities */
.activities-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.activity-item {
  background-color: var(--bg-card);
  padding: 1rem;
  border-radius: 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
}

.activity-main {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.activity-type {
  background-color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.activity-name {
  font-weight: 500;
}

.activity-stats {
  display: flex;
  gap: 1rem;
  grid-column: 1 / -1;
  flex-wrap: wrap;
}

.stat {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.stat strong {
  color: var(--text-primary);
}

.activity-date {
  color: var(--text-secondary);
  font-size: 0.85rem;
  grid-column: 2;
  grid-row: 1;
  text-align: right;
}

/* Analysis */
.analysis {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.fatigue-indicator {
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  font-size: 1.1rem;
}

.fatigue-low {
  background-color: rgba(34, 197, 94, 0.2);
  color: var(--success);
}

.fatigue-moderate {
  background-color: rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

.fatigue-high {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.analysis-summary {
  font-size: 1.05rem;
  line-height: 1.7;
}

.next-workout {
  background-color: var(--bg-card);
  padding: 1rem;
  border-radius: 8px;
  border-left: 4px solid var(--accent);
}

.next-workout h3 {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.recommendations h3,
.insights h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
}

.recommendations ul,
.insights ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.recommendations li,
.insights li {
  padding-left: 1.5rem;
  position: relative;
}

.recommendations li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.insights li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--text-secondary);
}

footer {
  text-align: center;
  margin-top: 3rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  header h1 {
    font-size: 1.75rem;
  }

  .card-header {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }

  .activity-item {
    grid-template-columns: 1fr;
  }

  .activity-date {
    grid-column: 1;
    grid-row: auto;
    text-align: left;
  }
}