/* ── CSS Variables ─────────────────────────────────────────────── */
:root {
  --green: #22c55e;
  --green-light: #dcfce7;
  --red: #ef4444;
  --red-light: #fee2e2;
  --orange: #f97316;
  --blue: #3b82f6;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --shadow: 0 1px 6px rgba(0,0,0,0.06);
  --radius: 12px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ── Reset ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Navbar ────────────────────────────────────────────────────── */
.navbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--green);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav-username {
  font-size: 0.9rem;
  color: var(--muted);
}

/* ── Container ─────────────────────────────────────────────────── */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Cards ─────────────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

/* ── Summary Cards ─────────────────────────────────────────────── */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.stat-card { text-align: center; padding: 1.5rem; }
.stat-label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-value { font-size: 2.25rem; font-weight: 800; color: var(--green); margin: 0.25rem 0; }
.stat-sub { font-size: 0.8rem; color: var(--muted); }

/* ── Week Nav ──────────────────────────────────────────────────── */
.week-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}
.week-label {
  font-weight: 600;
  font-size: 1rem;
  min-width: 200px;
  text-align: center;
}

/* ── Buttons ───────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { background: var(--bg); border-color: var(--muted); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Timetable ─────────────────────────────────────────────────── */
.timetable-section { overflow: hidden; }
.timetable-wrapper { overflow-x: auto; }
.section-title { font-size: 1rem; font-weight: 700; margin-bottom: 1rem; color: var(--text); }

.timetable {
  display: grid;
  grid-template-columns: 100px repeat(7, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: 8px;
  overflow: hidden;
  min-width: 780px;
}

.tt-header-blank {
  background: var(--bg);
  padding: 0.5rem;
}
.tt-day-header {
  background: var(--bg);
  padding: 0.5rem 0.25rem;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
}
.tt-day-header.today {
  color: var(--green);
  font-weight: 700;
}
.tt-meal-label {
  background: var(--bg);
  padding: 0.6rem 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  display: flex;
  align-items: flex-start;
  padding-top: 0.75rem;
}
.tt-cell {
  background: var(--card-bg);
  padding: 0.5rem 0.4rem;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.tt-cell.today-col { background: #f0fdf4; }
.tt-empty { color: var(--muted); font-size: 0.75rem; opacity: 0.5; padding-top: 0.25rem; }

.food-item {
  border-radius: 6px;
  padding: 0.3rem 0.4rem;
  font-size: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.food-item.healthy { border-left: 3px solid var(--green); }
.food-item.unhealthy { border-left: 3px solid var(--red); }
.food-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 120px;
}
.food-cal {
  color: var(--muted);
  font-size: 0.7rem;
}
.food-badge {
  font-size: 0.65rem;
  padding: 1px 5px;
  border-radius: 10px;
  font-weight: 600;
  display: inline-block;
  width: fit-content;
}
.badge-healthy { background: var(--green-light); color: #16a34a; }
.badge-unhealthy { background: var(--red-light); color: #dc2626; }

/* ── Charts ────────────────────────────────────────────────────── */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.chart-card { padding: 1.25rem; }
.chart-title { font-size: 0.9rem; font-weight: 700; margin-bottom: 1rem; }

/* ── Loading / States ──────────────────────────────────────────── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.2s infinite;
  border-radius: 6px;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .summary-cards { grid-template-columns: 1fr; }
  .charts-row { grid-template-columns: 1fr; }
  .container { padding: 1rem; }
  .stat-value { font-size: 1.75rem; }
}