/* ============================================
   Running Coach — Base Styles
   Dark theme, Strava accent, mobile-first
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a26;
  --bg-card-hover: #22222f;
  --text-primary: #e8e6e3;
  --text-secondary: #9a9a9a;
  --text-muted: #5a5a6a;
  --accent: #fc4c02;
  --accent-hover: #ff6b2b;
  --accent-glow: rgba(252, 76, 2, 0.15);
  --success: #2ecc71;
  --warning: #f39c12;
  --danger: #e74c3c;
  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(252, 76, 2, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 640px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ---- Layout ---- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- Landing page ---- */

.landing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 40px 20px;
}

.landing__logo {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.landing__tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 380px;
  margin-bottom: 48px;
  line-height: 1.5;
}

.landing__features {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 48px;
  width: 100%;
  max-width: 400px;
}

.feature {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: left;
  transition: border-color var(--transition);
}

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

.feature__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
}

.feature__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.feature__text strong {
  color: var(--text-primary);
  font-weight: 600;
  display: block;
  margin-bottom: 2px;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn--strava {
  background: var(--accent);
  color: #fff;
  width: 100%;
  max-width: 400px;
  padding: 16px 32px;
  font-size: 1.05rem;
  position: relative;
  overflow: hidden;
}

.btn--strava:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(252, 76, 2, 0.3);
}

.btn--strava:active {
  transform: translateY(0);
}

.btn--strava svg {
  width: 22px;
  height: 22px;
}

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

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

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 10px 20px;
  font-size: 0.9rem;
}

.btn--ghost:hover {
  color: var(--text-primary);
}

/* ---- Dashboard ---- */

.dashboard {
  padding: 32px 0;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.header__brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
}

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

/* ---- Stats cards ---- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color var(--transition);
}

.stat-card:hover {
  border-color: var(--border-accent);
}

.stat-card__label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.stat-card__value {
  font-size: 1.6rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.stat-card__unit {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-left: 4px;
}

.stat-card__trend {
  font-size: 0.8rem;
  margin-top: 4px;
}

.stat-card__trend--up { color: var(--success); }
.stat-card__trend--down { color: var(--danger); }
.stat-card__trend--stable { color: var(--text-muted); }

/* ---- Training plan ---- */

.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.plan-day {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 10px;
  transition: border-color var(--transition);
}

.plan-day:hover {
  border-color: var(--border-accent);
}

.plan-day__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.plan-day__name {
  font-weight: 600;
  font-size: 0.95rem;
}

.plan-day__badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 20px;
}

.badge--easy { background: rgba(46, 204, 113, 0.15); color: var(--success); }
.badge--tempo { background: rgba(243, 156, 18, 0.15); color: var(--warning); }
.badge--interval { background: rgba(231, 76, 60, 0.15); color: var(--danger); }
.badge--long { background: rgba(52, 152, 219, 0.15); color: #3498db; }
.badge--rest { background: rgba(255, 255, 255, 0.05); color: var(--text-muted); }

.plan-day__details {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.plan-day__meta {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* ---- Onboarding form ---- */

.onboarding {
  padding: 40px 0;
}

.onboarding__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.onboarding__subtitle {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-group__hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

select,
textarea,
input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239a9a9a' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

select:focus,
textarea:focus,
input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* ---- Day picker (multiselect) ---- */

.day-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.day-picker__day {
  padding: 10px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
  color: var(--text-secondary);
}

.day-picker__day:hover {
  border-color: var(--border-accent);
}

.day-picker__day--selected {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- Loading & states ---- */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  gap: 16px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

/* ---- Footer ---- */

.footer {
  margin-top: auto;
  padding: 24px 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer a:hover {
  color: var(--accent);
}

/* ---- Utilities ---- */

.hidden { display: none !important; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.text-sm { font-size: 0.85rem; }

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

@media (max-width: 480px) {
  .landing__logo { font-size: 2rem; }
  .stats-grid { grid-template-columns: 1fr; }
  .day-picker__day { padding: 8px 12px; font-size: 0.8rem; }
}