:root {
  color-scheme: light;
  --bg: #f5efe7;
  --bg-accent: #efe0cf;
  --surface: #fffdf9;
  --surface-2: #f8f4ed;
  --text: #1f2937;
  --muted: #5b6472;
  --line: #d9cab8;
  --brand: #7a4b20;
  --brand-strong: #5b3514;
  --success: #0f766e;
  --warning: #8a4f00;
  --shadow: 0 18px 50px rgba(90, 61, 34, 0.14);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans Thai", "Leelawadee UI", Tahoma, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.85), transparent 30%),
    linear-gradient(135deg, var(--bg), var(--bg-accent));
  min-height: 100vh;
}

a {
  color: var(--brand-strong);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--brand);
}

.page {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.hero {
  display: grid;
  gap: 18px;
  padding: 28px;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 252, 247, 0.92));
  border: 1px solid rgba(121, 75, 32, 0.12);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0;
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 3vw, 3.5rem);
}

h2 {
  font-size: clamp(1.35rem, 2vw, 2rem);
}

p {
  margin: 0;
  line-height: 1.7;
  color: var(--text);
}

.lede {
  max-width: 68ch;
  color: var(--muted);
  font-size: 1.04rem;
}

.breadcrumbs,
.meta-row,
.selector-row,
.section-grid,
.related-grid,
.landing-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.breadcrumbs {
  color: var(--muted);
  font-size: 0.95rem;
}

.breadcrumbs a {
  color: inherit;
}

.pill,
.selector,
.landing-card,
.info-card,
.result-card,
.form-card,
.panel {
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
}

.pill {
  padding: 8px 12px;
  font-size: 0.92rem;
}

.layout {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.calculator-shell {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.9fr);
}

.form-card,
.result-card,
.panel,
.landing-card,
.info-card {
  padding: 20px;
  box-shadow: 0 8px 26px rgba(56, 41, 25, 0.08);
}

.form-grid {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 8px;
}

label {
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #cbb8a3;
  border-radius: 14px;
  font: inherit;
  background: #fff;
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(122, 75, 32, 0.16);
  border-color: var(--brand);
}

.helper {
  color: var(--muted);
  font-size: 0.92rem;
}

.result-hero {
  display: grid;
  gap: 14px;
}

.value {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  color: var(--brand-strong);
}

.result-breakdown {
  display: grid;
  gap: 10px;
}

.stat {
  display: grid;
  gap: 4px;
  padding: 14px;
  border-radius: 16px;
  background: var(--surface-2);
}

.stat strong {
  font-size: 1.05rem;
}

.section-grid {
  align-items: flex-start;
}

.section-grid > * {
  flex: 1 1 320px;
}

.banner-slot {
  min-height: 80px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 16px;
  border: 1px dashed #c3a98e;
  border-radius: 18px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.55);
}

.faq {
  display: grid;
  gap: 12px;
}

.faq-item {
  padding: 16px 18px;
  border-radius: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.faq-item summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-item p {
  margin-top: 10px;
  color: var(--muted);
}

.landing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.subnet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.subnet-card {
  display: grid;
  gap: 10px;
}

.subnet-card h3 {
  font-size: 1.15rem;
}

.subnet-card .subnet-meta {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.subnet-card .subnet-note {
  color: var(--muted);
  font-size: 0.92rem;
}

.landing-card {
  display: grid;
  gap: 10px;
}

.hub-section {
  display: grid;
  gap: 14px;
}

.hub-section + .hub-section {
  margin-top: 10px;
}

.card-meta {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 2px;
}

.card-actions a {
  font-size: 0.92rem;
}

.footer {
  margin-top: 28px;
  padding: 18px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.note {
  color: var(--success);
  font-weight: 700;
}

.error {
  color: #b42318;
  font-weight: 700;
}

.mode-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mode-button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--brand-strong);
  border-radius: 999px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.mode-button.is-active {
  background: linear-gradient(135deg, var(--brand), #a06228);
  color: #fff;
  border-color: transparent;
}

.mode-panel[hidden],
.custom-field[hidden] {
  display: none !important;
}

.warning-card {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(138, 79, 0, 0.2);
  background: #fff7eb;
  color: #5b3514;
}

.warning-card p,
.warning-card li {
  color: #5b3514;
}

.warning-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
}

.checklist-grid {
  display: grid;
  gap: 12px;
}

.check-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-2);
}

.check-item input {
  width: 20px;
  height: 20px;
  margin: 2px 0 0;
  padding: 0;
}

@media (max-width: 860px) {
  .calculator-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page {
    width: min(var(--max-width), calc(100% - 20px));
    padding-top: 12px;
  }

  .hero,
  .form-card,
  .result-card,
  .panel,
  .landing-card,
  .info-card {
    padding: 16px;
  }

  .breadcrumbs,
  .meta-row,
  .selector-row {
    gap: 8px;
  }
}