:root {
  /* Cinematic Editorial — Light */
  --rp-bg: #fcf9f2;
  --rp-surface: #f6f3ec;
  --rp-surface-2: #f1eee7;
  --rp-surface-3: #e9e2d2;
  --rp-text: #1c1c18;
  --rp-text-secondary: #55504a;
  --rp-outline: #c4c7c7;
  --rp-outline-variant: #d8d3c8;
  --rp-action-bg: #000000;
  --rp-action-text: #ffffff;
  --rp-accent: #b34700;
  --rp-accent-strong: #ff6b00;
  --rp-focus-tint: rgba(28, 28, 24, 0.04);
}

body.theme-dark {
  /* Cinematic Editorial — Dark */
  --rp-bg: #121414;
  --rp-surface: #1a1c1c;
  --rp-surface-2: #1e2020;
  --rp-surface-3: #282a2b;
  --rp-text: #e2e2e2;
  --rp-text-secondary: #b7a89f;
  --rp-outline: #33302e;
  --rp-outline-variant: #262626;
  --rp-action-bg: #ff6b00;
  --rp-action-text: #14100d;
  --rp-accent: #ffb693;
  --rp-accent-strong: #ff6b00;
  --rp-focus-tint: rgba(255, 107, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--rp-bg);
  color: var(--rp-text);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--rp-outline-variant);
}

.site-header-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 64px;
}

.back-to-hub {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--rp-text-secondary);
  text-decoration: none;
}

.back-to-hub[hidden] {
  display: none;
}

.back-to-hub:hover {
  color: var(--rp-accent);
}

.wordmark {
  display: block;
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.01em;
  color: var(--rp-text);
  text-decoration: none;
}

.tagline {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--rp-text-secondary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.theme-toggle-icons {
  display: inline-flex;
  border: 1px solid var(--rp-outline);
  padding: 2px;
}

.theme-icon-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--rp-text-secondary);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.theme-icon-btn[aria-pressed="true"] {
  background: var(--rp-surface-3);
  color: var(--rp-accent-strong);
}

.lang-select-wrap select {
  border: 1px solid var(--rp-outline);
  border-radius: 0;
  background: transparent;
  color: var(--rp-text);
  font-family: "Manrope", system-ui, sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 6px 8px;
  cursor: pointer;
}

/* Page layout */
.page-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 64px;
}

.page-title {
  margin: 0 0 8px;
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 48px;
  line-height: 1.2;
}

.page-lede {
  margin: 0 0 40px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--rp-text-secondary);
  max-width: 56ch;
}

/* Calculator cards */
.calc-card {
  border: 1px solid var(--rp-outline-variant);
  border-top: 4px solid var(--rp-accent-strong);
  padding: 32px;
  margin-bottom: 32px;
  background-image:
    linear-gradient(var(--rp-outline-variant) 1px, transparent 1px),
    linear-gradient(90deg, var(--rp-outline-variant) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: -1px -1px;
}

.calc-title {
  margin: 0 0 6px;
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 24px;
}

.calc-subtitle {
  margin: 0 0 24px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--rp-text-secondary);
}

.calc-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-width: 140px;
}

.calc-field label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--rp-text-secondary);
}

.calc-input-group {
  display: flex;
}

.calc-field input[type="number"] {
  padding: 10px 12px;
  border: none;
  border-bottom: 2px solid var(--rp-outline);
  border-radius: 0;
  background: transparent;
  font-family: "Manrope", system-ui, sans-serif;
  font-size: 16px;
  color: var(--rp-text);
  width: 100%;
  min-width: 0;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.calc-input-group input[type="number"] {
  flex: 1;
}

.calc-input-group select {
  border: none;
  border-bottom: 2px solid var(--rp-outline);
  border-radius: 0;
  background: transparent;
  font-family: "Manrope", system-ui, sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--rp-text-secondary);
  padding: 10px 6px;
  cursor: pointer;
}

.calc-field input[type="number"]:focus,
.calc-input-group select:focus {
  outline: none;
  border-bottom-color: var(--rp-accent-strong);
  background-color: var(--rp-focus-tint);
}

.calc-result {
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--rp-surface);
  border: 1px solid var(--rp-outline-variant);
}

.calc-result-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--rp-text-secondary);
  margin-bottom: 6px;
}

.calc-result-value {
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 28px;
  line-height: 1.2;
  color: var(--rp-accent);
}

.calc-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--rp-text-secondary);
}

.calc-quick-values {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.calc-quick-btn {
  padding: 6px 14px;
  border: 1px solid var(--rp-outline);
  border-radius: 0;
  background: transparent;
  color: var(--rp-text-secondary);
  font-family: "Manrope", system-ui, sans-serif;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.calc-quick-btn:hover {
  color: var(--rp-accent);
  border-color: var(--rp-accent-strong);
  background-color: var(--rp-focus-tint);
}

/* FAQ (shared pattern with RPCard) */
.faq-section {
  border-top: 1px solid var(--rp-outline-variant);
}

.faq-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 64px;
}

.faq-title {
  margin: 0 0 24px;
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 28px;
}

.faq-item {
  padding: 16px 0;
  border-top: 1px solid var(--rp-outline-variant);
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
}

.faq-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--rp-text-secondary);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--rp-outline-variant);
}

.site-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 64px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--rp-text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--rp-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 900px) {
  .site-header-inner {
    padding: 16px;
  }

  .page-main,
  .faq-inner,
  .site-footer-inner {
    padding: 32px 16px;
  }

  .page-title {
    font-size: 32px;
  }

  .calc-card {
    padding: 24px 20px;
  }
}

@media (max-width: 480px) {
  .calc-row {
    flex-direction: column;
  }
}