:root {
  --color-primary: #0e4c68;
  --color-primary-dark: #093245;
  --color-primary-light: #16698f;
  --color-primary-surface: #f0f7fa;
  --color-accent: #f59e0b;
  --color-accent-hover: #d97706;
  --color-accent-active: #b45309;
  --color-accent-tint: #fef3c7;
  --color-ink: #0f172a;
  --color-ink-muted: #475569;
  --color-ink-subtle: #64748b;
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-border-subtle: #cbd5e1;
  --color-focus: rgba(14, 76, 104, 0.25);
  --color-green-tint: #ecfdf5;
  --color-green-border: #a7f3d0;
  --color-green-ink: #065f46;
  --color-amber-tint: #fffbeb;
  --color-amber-border: #fde68a;
  --color-amber-ink: #92400e;
  --color-red-tint: #fef2f2;
  --color-red-border: #fecaca;
  --color-red-ink: #991b1b;
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-pill: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-card: 0 4px 16px -2px rgba(14, 76, 104, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 10px 24px -4px rgba(14, 76, 104, 0.12), 0 4px 10px -2px rgba(15, 23, 42, 0.05);
  --shadow-elevated: 0 14px 32px -6px rgba(14, 76, 104, 0.16);
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition-fast: 160ms ease-in-out;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
}

.wrap {
  width: 100%;
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 3px 0 rgba(15, 23, 42, 0.03);
}

.site-header .wrap {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.brand,
.logo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  text-decoration: none;
  line-height: 1.2;
}

.brand:hover,
.logo-brand:hover {
  color: var(--color-primary-dark);
}

.logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 12px;
}

.site-nav a {
  padding: 8px 12px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-decoration: none;
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-primary);
  background-color: var(--color-primary-surface);
}

.site-nav a:active {
  background-color: var(--color-border);
}

.hero {
  padding-top: 48px;
  padding-bottom: 32px;
  text-align: left;
}

.hero h1 {
  margin: 0 0 16px 0;
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-primary-dark);
  max-width: 22ch;
}

.hero p {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-ink-muted);
  max-width: 680px;
}

.checker {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px 24px;
  margin-top: 8px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.checker-intro {
  margin: 0 0 4px 0;
  font-size: 0.9375rem;
  color: var(--color-ink-subtle);
  line-height: 1.5;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.field label {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

.field small,
.field-hint {
  font-size: 0.8125rem;
  color: var(--color-ink-subtle);
  line-height: 1.4;
  margin-top: -2px;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  width: 100%;
}

input[type="number"],
input[type="text"],
input[type="email"],
select {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--color-ink);
  background-color: #ffffff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

select {
  background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2214%22%20height%3D%2210%22%20viewBox%3D%220%200%2014%2010%22%3E%3Cpath%20fill%3D%22%23475569%22%20d%3D%22M7%209L0%201.5%201.5%200%207%205.8%2012.5%200%2014%201.5z%22%2F%3E%3C%2Fsvg%3E');
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 12px 8px;
  padding-right: 36px;
  cursor: pointer;
}

input:hover,
select:hover {
  border-color: var(--color-border-subtle);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-focus);
}

input::placeholder {
  color: #94a3b8;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: auto;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.25;
  color: #ffffff;
  background-color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 13px 22px;
  text-decoration: none;
  cursor: pointer;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform 100ms ease;
}

.btn:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #ffffff;
}

.btn:active {
  background-color: var(--color-accent-active);
  border-color: var(--color-accent-active);
  transform: translateY(1px);
}

.btn-secondary {
  color: var(--color-primary);
  background-color: transparent;
  border: 1.5px solid var(--color-primary);
  text-shadow: none;
  box-shadow: none;
}

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

.btn-secondary:active {
  background-color: #e0eff5;
  border-color: var(--color-primary-dark);
}

.btn:focus-visible,
.btn-secondary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--color-focus);
}

@media (min-width: 640px) {
  .site-header .wrap {
    min-height: 72px;
  }
  .hero {
    padding-top: 56px;
    padding-bottom: 40px;
  }
  .hero h1 {
    font-size: 2.75rem;
  }
  .field-grid {
    grid-template-columns: 1fr 1fr;
  }
  .checker {
    padding: 32px 30px;
  }
  .checker .btn {
    align-self: flex-start;
  }
}

.result {
  margin-top: 24px;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  border-left-width: 6px;
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.result strong {
  display: block;
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.result p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-ink-muted);
}

.result.below {
  background-color: var(--color-green-tint);
  border-color: var(--color-green-border);
  border-left-color: var(--color-green-ink);
}

.result.below strong {
  color: var(--color-green-ink);
}

.result.in {
  background-color: var(--color-primary-surface);
  border-color: var(--color-border-subtle);
  border-left-color: var(--color-primary);
}

.result.in strong {
  color: var(--color-primary-dark);
}

.result.high {
  background-color: var(--color-amber-tint);
  border-color: var(--color-amber-border);
  border-left-color: var(--color-accent-hover);
}

.result.high strong {
  color: var(--color-amber-ink);
}

.result.way-above {
  background-color: var(--color-red-tint);
  border-color: var(--color-red-border);
  border-left-color: var(--color-red-ink);
}

.result.way-above strong {
  color: var(--color-red-ink);
}

.tiers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  align-items: stretch;
  margin-top: 32px;
  margin-bottom: 40px;
}

.tier {
  position: relative;
  background-color: var(--color-card);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.tier:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.tier.featured {
  background-color: #fafcfe;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-elevated);
  transform: scale(1.02);
  z-index: 2;
}

.tier.featured:hover {
  transform: scale(1.02) translateY(-2px);
  box-shadow: 0 18px 36px -6px rgba(14, 76, 104, 0.2);
}

.tier-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
}

.tier h3 {
  margin: 0 0 10px 0;
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
}

.tier .price {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-primary-dark);
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.tier .unit {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink-subtle);
  letter-spacing: normal;
  margin-left: 4px;
}

.tier-desc {
  margin: 0 0 20px 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.tier-features {
  list-style: none;
  margin: 0 0 28px 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.tier-features li {
  position: relative;
  padding-left: 24px;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-ink);
}

.tier-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 7px;
  border-left: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(-45deg);
}

.tier .btn {
  width: 100%;
  margin-top: auto;
}

.guide-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
  margin-bottom: 36px;
}

.guide-list a,
.guide-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.guide-list a:hover,
.guide-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-card);
  transform: translateX(3px);
}

.guide-list h4,
.guide-card h4 {
  margin: 0 0 6px 0;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.35;
}

.guide-list a:hover h4,
.guide-card:hover h4 {
  color: var(--color-primary-dark);
}

.guide-list p,
.guide-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-ink-muted);
}

table.ranges {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  margin-bottom: 28px;
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

table.ranges caption {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  text-align: left;
  padding: 12px 6px;
  caption-side: top;
}

table.ranges th {
  background-color: var(--color-primary-surface);
  color: var(--color-primary-dark);
  font-size: 0.875rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1.5px solid var(--color-border);
}

table.ranges td {
  padding: 13px 16px;
  font-size: 0.9375rem;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-border);
  line-height: 1.45;
}

table.ranges td.cost {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--color-primary-dark);
  white-space: nowrap;
}

table.ranges tbody tr:nth-child(even) {
  background-color: #fbfdfe;
}

table.ranges tbody tr:hover {
  background-color: var(--color-primary-surface);
}

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

.disclaimer {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--color-ink-subtle);
  margin-top: 18px;
  margin-bottom: 24px;
}

.site-footer {
  margin-top: 64px;
  background-color: var(--color-primary-surface);
  border-top: 1px solid var(--color-border);
  padding: 44px 0 32px 0;
}

.site-footer .wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px 18px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer-links a {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-decoration: none;
}

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

.copyright {
  font-size: 0.8125rem;
  color: var(--color-ink-subtle);
  margin: 0;
}

@media (max-width: 680px) {
  .site-header .wrap {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-top: 14px;
    padding-bottom: 14px;
  }
  .hero h1 {
    font-size: 1.875rem;
  }
  .checker {
    padding: 22px 18px;
  }
  .tiers {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .tier.featured {
    transform: none;
  }
  .tier.featured:hover {
    transform: translateY(-2px);
  }
  table.ranges th,
  table.ranges td {
    padding: 10px 12px;
    font-size: 0.875rem;
  }
}

@media (max-width: 390px) {
  .wrap {
    padding-left: 14px;
    padding-right: 14px;
  }
  .site-nav {
    width: 100%;
    gap: 4px 8px;
  }
  .site-nav a {
    padding: 6px 8px;
    font-size: 0.875rem;
  }
  .tier {
    padding: 24px 18px;
  }
  .tier .price {
    font-size: 1.875rem;
  }
  table.ranges {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  table.ranges th,
  table.ranges td {
    padding: 8px 10px;
    white-space: normal;
    word-break: break-word;
  }
  table.ranges td.cost {
    white-space: normal;
  }
}