/* Vercel-inspired Design System */
:root {
  /* Colors - Light Theme */
  --background: #ffffff;
  --background-secondary: #fafafa;
  --foreground: #000000;
  --foreground-secondary: #666666;
  --foreground-tertiary: #888888;

  --border: #eaeaea;
  --border-hover: #999999;

  --accent-free: #0070f3;
  --accent-free-light: #e6f0ff;
  --accent-paid: #f5a623;
  --accent-paid-light: #fff8e6;
  --accent-success: #0cce6b;
  --accent-success-light: #e6fff0;
  --accent-error: #ee0000;
  --accent-error-light: #ffe6e6;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.04), 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--foreground);
  line-height: 1.6;
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
}

.logo svg {
  color: var(--foreground);
}

.header-badge {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  background: var(--foreground);
  color: var(--background);
  border-radius: 999px;
}

/* Hero Section */
.hero {
  background: linear-gradient(180deg, var(--background-secondary) 0%, var(--background) 100%);
  padding: 60px 24px 48px;
  text-align: center;
}

.hero-content {
  max-width: 600px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  background: linear-gradient(180deg, #000 0%, #333 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--foreground-secondary);
  margin-bottom: 40px;
}

/* Age Selector */
.age-selector {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-lg);
}

.age-input-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
}

.age-input-group input {
  width: 100px;
  height: 56px;
  font-size: 32px;
  font-weight: 600;
  text-align: center;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.age-input-group input:focus {
  border-color: var(--foreground);
}

.age-unit {
  font-size: 18px;
  color: var(--foreground-secondary);
}

.age-slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  margin-bottom: 12px;
}

.age-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--foreground);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.age-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.age-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--foreground);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.age-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--foreground-tertiary);
}

/* Section */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-header h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
}

.section-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--background-secondary);
  border-radius: var(--radius-md);
}

.age-display {
  font-size: 14px;
  font-weight: 500;
  padding: 6px 12px;
  background: var(--foreground);
  color: var(--background);
  border-radius: var(--radius-md);
}

/* Vaccine Grid */
.vaccine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.vaccine-card {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.vaccine-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.vaccine-card.free {
  border-left: 3px solid var(--accent-free);
}

.vaccine-card.paid {
  border-left: 3px solid var(--accent-paid);
}

.vaccine-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.vaccine-card-title {
  font-size: 16px;
  font-weight: 600;
}

.vaccine-card-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.vaccine-card-badge.free {
  background: var(--accent-free-light);
  color: var(--accent-free);
}

.vaccine-card-badge.paid {
  background: var(--accent-paid-light);
  color: #b37400;
}

.vaccine-card-diseases {
  font-size: 13px;
  color: var(--foreground-secondary);
  margin-bottom: 12px;
}

.vaccine-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--foreground-tertiary);
}

.vaccine-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
}

.tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--foreground-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab:hover {
  color: var(--foreground);
}

.tab.active {
  color: var(--foreground);
  border-bottom-color: var(--foreground);
}

/* Tab Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Timeline */
.timeline-container {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.timeline-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--background-secondary);
}

.timeline-legend {
  display: flex;
  gap: 24px;
  font-size: 13px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--foreground-secondary);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.free {
  background: var(--accent-free);
}

.dot.paid {
  background: var(--accent-paid);
}

.dot.optional {
  background: var(--foreground-tertiary);
}

.timeline {
  padding: 24px;
}

.timeline-row {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border);
}

.timeline-row:last-child {
  border-bottom: none;
}

.timeline-age {
  width: 100px;
  flex-shrink: 0;
  padding: 16px 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--foreground);
  border-right: 1px solid var(--border);
}

.timeline-age.current {
  background: var(--accent-free-light);
  margin: -1px 0;
  padding: 17px 16px;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.timeline-vaccines {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 16px;
}

.timeline-vaccine {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 13px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.timeline-vaccine.free {
  background: var(--accent-free-light);
  color: var(--accent-free);
}

.timeline-vaccine.paid {
  background: var(--accent-paid-light);
  color: #b37400;
}

.timeline-vaccine.optional {
  background: var(--background-secondary);
  color: var(--foreground-secondary);
  border: 1px solid var(--border);
}

.timeline-vaccine:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-sm);
}

.timeline-vaccine .dose {
  font-size: 11px;
  opacity: 0.8;
}

/* Compare View */
.compare-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.compare-column {
  padding: 24px;
}

.compare-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.compare-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.badge {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.badge.free {
  background: var(--accent-free-light);
  color: var(--accent-free);
}

.badge.paid {
  background: var(--accent-paid-light);
  color: #b37400;
}

.compare-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  background: var(--background-secondary);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  color: var(--foreground-tertiary);
}

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.compare-item {
  padding: 16px;
  background: var(--background-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.compare-item:hover {
  background: var(--border);
}

.compare-item-name {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.compare-item-diseases {
  font-size: 12px;
  color: var(--foreground-secondary);
  margin-bottom: 8px;
}

.compare-item-price {
  font-size: 13px;
  font-weight: 500;
}

.free-column .compare-item-price {
  color: var(--accent-free);
}

.paid-column .compare-item-price {
  color: #b37400;
}

/* Groups Section */
.groups-section {
  margin-top: 32px;
}

.groups-section h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 16px;
}

.group-card {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.group-card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.group-card-desc {
  font-size: 13px;
  color: var(--foreground-secondary);
  margin-bottom: 16px;
}

.group-card-comparison {
  font-size: 13px;
  padding: 12px;
  background: var(--background-secondary);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.group-card-recommendation {
  font-size: 13px;
  color: var(--accent-free);
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.group-card-recommendation::before {
  content: "✓";
  font-weight: bold;
}

/* All Vaccines View */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.search-box {
  position: relative;
  max-width: 400px;
}

.search-box svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--foreground-tertiary);
}

.search-box input {
  width: 100%;
  height: 44px;
  padding: 0 16px 0 44px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--foreground);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--foreground-secondary);
  background: var(--background-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.chip.active {
  color: var(--background);
  background: var(--foreground);
  border-color: var(--foreground);
}

/* Vaccine Table */
.vaccine-table-container {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.vaccine-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.vaccine-table th {
  text-align: left;
  padding: 14px 16px;
  font-weight: 500;
  color: var(--foreground-secondary);
  background: var(--background-secondary);
  border-bottom: 1px solid var(--border);
}

.vaccine-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.vaccine-table tr:last-child td {
  border-bottom: none;
}

.vaccine-table tr:hover td {
  background: var(--background-secondary);
}

.vaccine-table .name-cell {
  font-weight: 500;
}

.vaccine-table .type-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.vaccine-table .type-badge.free {
  background: var(--accent-free-light);
  color: var(--accent-free);
}

.vaccine-table .type-badge.paid {
  background: var(--accent-paid-light);
  color: #b37400;
}

.vaccine-table .diseases-cell {
  color: var(--foreground-secondary);
  max-width: 300px;
}

.vaccine-table .price-cell {
  font-weight: 500;
  font-family: var(--font-mono);
}

.vaccine-table .action-cell {
  text-align: right;
}

.detail-btn {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--foreground);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.detail-btn:hover {
  border-color: var(--foreground);
}

/* Tips Section */
.tips-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
  border-top: 1px solid var(--border);
}

.tips-section h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 24px;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.tip-card {
  padding: 20px;
  background: var(--background-secondary);
  border-radius: var(--radius-lg);
}

.tip-card-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tip-card-title::before {
  content: "";
  width: 4px;
  height: 16px;
  background: var(--accent-free);
  border-radius: 2px;
}

.tip-card-content {
  font-size: 13px;
  color: var(--foreground-secondary);
  line-height: 1.7;
}

/* Footer */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  background: var(--background-secondary);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.disclaimer {
  font-size: 12px;
  color: var(--foreground-tertiary);
  margin-bottom: 16px;
  line-height: 1.8;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
}

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

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

.footer-links .divider {
  color: var(--border);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  background: var(--background);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background-secondary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
}

.modal-close:hover {
  background: var(--border);
}

.modal-content {
  padding: 32px;
  overflow-y: auto;
  max-height: 90vh;
}

.modal-header {
  margin-bottom: 24px;
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal-subtitle {
  font-size: 14px;
  color: var(--foreground-secondary);
}

.modal-badges {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.modal-section {
  margin-bottom: 24px;
}

.modal-section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--foreground-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.modal-section-content {
  font-size: 14px;
  color: var(--foreground-secondary);
  line-height: 1.7;
}

.schedule-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.schedule-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--background-secondary);
  border-radius: var(--radius-md);
}

.schedule-dose {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  background: var(--foreground);
  color: var(--background);
  border-radius: 50%;
}

.schedule-info {
  flex: 1;
}

.schedule-age {
  font-size: 14px;
  font-weight: 500;
}

.schedule-note {
  font-size: 12px;
  color: var(--foreground-tertiary);
}

.modal-price {
  font-size: 28px;
  font-weight: 700;
  font-family: var(--font-mono);
}

.modal-price.free {
  color: var(--accent-free);
}

.modal-price.paid {
  color: #b37400;
}

.modal-price-note {
  font-size: 12px;
  color: var(--foreground-tertiary);
  margin-top: 4px;
}

.alternatives-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.alternative-chip {
  padding: 8px 14px;
  font-size: 13px;
  background: var(--background-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.alternative-chip:hover {
  border-color: var(--foreground);
}

.recommendation-box {
  padding: 16px;
  background: var(--accent-success-light);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: #0a8f4d;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .age-selector {
    padding: 24px;
  }

  .age-input-group input {
    width: 80px;
    height: 48px;
    font-size: 24px;
  }

  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tab {
    padding: 12px 16px;
    white-space: nowrap;
  }

  .compare-container {
    grid-template-columns: 1fr;
  }

  .compare-divider {
    width: 100%;
    height: 48px;
    border-left: none;
    border-right: none;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .groups-grid {
    grid-template-columns: 1fr;
  }

  .vaccine-table-container {
    overflow-x: auto;
  }

  .vaccine-table {
    min-width: 600px;
  }

  .timeline-age {
    width: 70px;
    font-size: 12px;
  }

  .modal {
    max-height: 100vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .modal-content {
    padding: 24px;
  }
}

/* Print styles */
@media print {
  .header,
  .tabs,
  .filter-bar,
  .modal-overlay,
  .footer {
    display: none !important;
  }

  .tab-content {
    display: block !important;
  }

  .vaccine-card,
  .compare-item,
  .group-card,
  .tip-card {
    break-inside: avoid;
  }
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--foreground-tertiary);
}

.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state p {
  font-size: 14px;
}