/* ============================================
   SG Fuel Prices — Styles
   Light theme with brand-color accents
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Base */
  --bg-primary: #ffffff;
  --bg-secondary: #f4f6f8;
  --bg-tertiary: #e9ecef;
  --text-primary: #1a1a2e;
  --text-secondary: #5a6577;
  --text-muted: #8e99a9;
  --border: #dfe3e8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.08);

  /* Brand Colors */
  --esso-primary: #1A3C6E;
  --esso-accent: #CC0000;
  --esso-bg: rgba(26, 60, 110, 0.07);

  --shell-primary: #DD1D21;
  --shell-accent: #FBCE07;
  --shell-bg: rgba(221, 29, 33, 0.06);

  --spc-primary: #003DA5;
  --spc-accent: #E31937;
  --spc-bg: rgba(0, 61, 165, 0.06);

  --caltex-primary: #ED1C24;
  --caltex-accent: #009639;
  --caltex-bg: rgba(237, 28, 36, 0.05);

  --sinopec-primary: #CC0000;
  --sinopec-accent: #003399;
  --sinopec-bg: rgba(204, 0, 0, 0.05);

  /* Semantic */
  --cheapest: #16a34a;
  --cheapest-bg: rgba(22, 163, 74, 0.08);
  --expensive: #dc2626;
  --price-up: #dc2626;
  --price-down: #16a34a;
  --link: #2563eb;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* --- Header --- */
.header {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
}

.header-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}

.fuel-icon {
  font-size: 1.6rem;
}

.header-subtitle {
  font-size: 1rem;
  opacity: 0.8;
  font-weight: 400;
}

.header-updated {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  opacity: 0.6;
}

/* --- Toolbar --- */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
}

.toolbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.date-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--text-primary);
  transition: all 0.15s ease;
}
.btn-icon:hover {
  background: var(--bg-secondary);
  border-color: var(--text-muted);
}

.date-picker {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.btn-small {
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-small:hover {
  background: var(--text-primary);
  color: #fff;
  border-color: var(--text-primary);
}

/* --- Company Filters --- */
.company-filters {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
}

.filter-pill {
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 20px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: capitalize;
}
.filter-pill:hover {
  border-color: var(--text-muted);
}
.filter-pill.active {
  color: #fff;
  border-color: transparent;
}

/* Brand-specific active pill styles */
.filter-pill[data-company="all"].active {
  background: var(--text-primary);
  border-color: var(--text-primary);
}
.filter-pill[data-company="esso"].active {
  background: var(--esso-primary);
}
.filter-pill[data-company="shell"].active {
  background: var(--shell-primary);
}
.filter-pill[data-company="spc"].active {
  background: var(--spc-primary);
}
.filter-pill[data-company="caltex"].active {
  background: var(--caltex-primary);
}
.filter-pill[data-company="sinopec"].active {
  background: var(--sinopec-primary);
}

/* --- Main --- */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.section {
  margin-bottom: 2rem;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--bg-tertiary);
}

/* --- Summary Cards --- */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}

.summary-card {
  background: var(--bg-primary);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--cheapest);
}

.summary-card .grade-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.summary-card .cheapest-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cheapest);
  font-variant-numeric: tabular-nums;
}

.summary-card .cheapest-company {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

.summary-card .cheapest-card {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

/* --- Price Tables --- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  min-width: 500px;
}

.price-table th {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  padding: 0.85rem 1rem;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--bg-tertiary);
}

.price-table th:first-child {
  text-align: left;
  min-width: 100px;
}

.price-table td {
  padding: 0.75rem 1rem;
  text-align: center;
  border-bottom: 1px solid var(--bg-tertiary);
  font-size: 0.95rem;
  font-weight: 500;
}

.price-table td:first-child {
  text-align: left;
}

/* Company row styling */
.price-table tr[data-company] td:first-child {
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.company-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.price-table tr[data-company="esso"] { background: var(--esso-bg); }
.price-table tr[data-company="esso"] td:first-child { border-left: 4px solid var(--esso-primary); }
.price-table tr[data-company="esso"] .company-dot { background: var(--esso-primary); }

.price-table tr[data-company="shell"] { background: var(--shell-bg); }
.price-table tr[data-company="shell"] td:first-child { border-left: 4px solid var(--shell-primary); }
.price-table tr[data-company="shell"] .company-dot { background: var(--shell-primary); }

.price-table tr[data-company="spc"] { background: var(--spc-bg); }
.price-table tr[data-company="spc"] td:first-child { border-left: 4px solid var(--spc-primary); }
.price-table tr[data-company="spc"] .company-dot { background: var(--spc-primary); }

.price-table tr[data-company="caltex"] { background: var(--caltex-bg); }
.price-table tr[data-company="caltex"] td:first-child { border-left: 4px solid var(--caltex-primary); }
.price-table tr[data-company="caltex"] .company-dot { background: var(--caltex-primary); }

.price-table tr[data-company="sinopec"] { background: var(--sinopec-bg); }
.price-table tr[data-company="sinopec"] td:first-child { border-left: 4px solid var(--sinopec-primary); }
.price-table tr[data-company="sinopec"] .company-dot { background: var(--sinopec-primary); }

.price-table tr[data-company]:hover {
  filter: brightness(0.97);
}

/* Cheapest highlight */
.price-cell.cheapest {
  color: var(--cheapest);
  font-weight: 700;
  background: var(--cheapest-bg);
  border-radius: 6px;
}

.price-cell.unavailable {
  color: var(--text-muted);
  font-style: italic;
}

/* Discount sub-label */
.price-cell .card-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.price-cell .discount-pct {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--cheapest);
}

/* Hidden rows (filtered) */
.price-table tr.hidden {
  display: none;
}

/* --- Chart Container --- */
.chart-container {
  background: var(--bg-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.chart-card {
  padding: 0.75rem;
}

.chart-card .chart-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.chart-card svg {
  width: 100%;
  height: 60px;
}

.chart-card .chart-range {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  font-variant-numeric: tabular-nums;
}

/* --- Promo Grid --- */
.promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.promo-card {
  background: var(--bg-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem;
  border-top: 3px solid var(--link);
  transition: box-shadow 0.2s ease;
}
.promo-card:hover {
  box-shadow: var(--shadow-lg);
}

.promo-card .promo-bank {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.promo-card .promo-card-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.promo-card .promo-discount {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cheapest);
  margin-bottom: 0.5rem;
}

.promo-card .promo-companies {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.promo-company-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
  color: #fff;
  text-transform: capitalize;
}
.promo-company-tag.esso { background: var(--esso-primary); }
.promo-company-tag.shell { background: var(--shell-primary); }
.promo-company-tag.spc { background: var(--spc-primary); }
.promo-company-tag.caltex { background: var(--caltex-primary); }
.promo-company-tag.sinopec { background: var(--sinopec-primary); }

.promo-card .promo-conditions {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.promo-card .promo-link {
  display: inline-block;
  margin-top: 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
}

/* --- Footer --- */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  margin-top: 1rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.footer-info {
  flex: 1;
  min-width: 200px;
}

.footer-info p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.footer-note {
  color: var(--text-muted) !important;
  font-size: 0.75rem !important;
}

/* --- Mini Calendar --- */
.mini-calendar {
  flex-shrink: 0;
}

.cal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.cal-header .cal-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.cal-header button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}
.cal-header button:hover {
  background: var(--bg-secondary);
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 28px);
  gap: 2px;
  justify-items: center;
}

.cal-grid .cal-dow {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  text-align: center;
  line-height: 28px;
}

.cal-day {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  border-radius: 6px;
  color: var(--text-muted);
  cursor: default;
}

.cal-day.has-data {
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  background: var(--bg-secondary);
}
.cal-day.has-data:hover {
  background: var(--bg-tertiary);
}

.cal-day.today {
  border: 2px solid var(--link);
}

.cal-day.selected {
  background: var(--text-primary);
  color: #fff;
}

/* --- Loading & States --- */
.loading-skeleton {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.error-state {
  padding: 2rem;
  text-align: center;
  color: var(--expensive);
  font-size: 0.9rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .header {
    padding: 1.5rem 1rem 1.25rem;
  }
  .header-title {
    font-size: 1.5rem;
  }
  .toolbar {
    padding: 0.6rem 1rem;
  }
  .toolbar-inner {
    gap: 0.6rem;
  }
  .main {
    padding: 1rem;
  }
  .summary-cards {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
  .promo-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
  }
  .company-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.25rem;
  }
  .filter-pill {
    white-space: nowrap;
  }
}

@media (max-width: 480px) {
  .header-title {
    font-size: 1.25rem;
  }
  .header-subtitle {
    font-size: 0.85rem;
  }
  .section-title {
    font-size: 1rem;
  }
  .summary-card .cheapest-price {
    font-size: 1.25rem;
  }
}