:root {
  --bg: #f7faf9;
  --surface: #ffffff;
  --surface-soft: #eef7f4;
  --ink: #13201c;
  --muted: #607069;
  --line: #dce7e3;
  --teal: #0f8f82;
  --teal-dark: #0a695f;
  --coral: #d95d4f;
  --gold: #c58a1d;
  --blue: #3876bf;
  --green: #2f9d66;
  --shadow: 0 12px 28px rgba(24, 50, 42, 0.08);
  color-scheme: light;
}

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

[hidden],
.is-hidden {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

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

.site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  color: var(--ink);
}

.brand img {
  width: 34px;
  height: 34px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 8px 10px;
  border-radius: 8px;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--teal-dark);
  background: var(--surface-soft);
  outline: none;
}

.hero {
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(15, 143, 130, 0.13), rgba(217, 93, 79, 0.09)),
    var(--surface);
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 42px 20px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 36px;
  align-items: center;
}

.hero h1 {
  font-size: 2.75rem;
  line-height: 1.06;
  margin: 0 0 14px;
}

.hero p {
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.6;
  margin: 0 0 22px;
  max-width: 720px;
}

.search-panel {
  display: grid;
  gap: 12px;
  max-width: 640px;
}

.search-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.search-input,
.field-control {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  padding: 0 14px;
}

.search-input:focus,
.field-control:focus {
  border-color: var(--teal);
  outline: 3px solid rgba(15, 143, 130, 0.16);
}

.button,
.icon-button {
  border: 0;
  border-radius: 8px;
  background: var(--teal);
  color: #ffffff;
  min-height: 48px;
  padding: 0 18px;
  font-weight: 750;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.button:hover,
.button:focus-visible,
.icon-button:hover,
.icon-button:focus-visible {
  background: var(--teal-dark);
  outline: none;
}

.button.secondary {
  color: var(--teal-dark);
  background: var(--surface-soft);
  border: 1px solid rgba(15, 143, 130, 0.2);
}

.button.secondary:hover,
.button.secondary:focus-visible {
  background: #dff0eb;
}

.hero-stat {
  background: var(--ink);
  color: #ffffff;
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.hero-stat strong {
  display: block;
  font-size: 3rem;
  line-height: 1;
}

.hero-stat span {
  display: block;
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.76);
  line-height: 1.5;
}

.main {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 20px 56px;
  flex: 1;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin: 8px 0 18px;
}

.section-header h2,
.content-section h2 {
  font-size: 1.35rem;
  margin: 0;
}

.section-header p {
  margin: 5px 0 0;
  color: var(--muted);
}
.category-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 3px 0 6px;
  scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  min-height: 40px;
  padding: 0 12px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.tab.active,
.tab:hover,
.tab:focus-visible {
  border-color: rgba(15, 143, 130, 0.34);
  color: var(--teal-dark);
  background: var(--surface-soft);
  outline: none;
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(245px, 1fr));
  gap: 14px;
}

.calculator-card,
.related-card,
.faq-item,
.content-section,
.calculator-panel,
.sidebar-panel,
.notice {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.calculator-card {
  min-height: 166px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  min-width: 0;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.calculator-card:hover,
.calculator-card:focus-visible {
  border-color: rgba(15, 143, 130, 0.42);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  outline: none;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-soft);
  font-size: 1.35rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 8px;
  padding: 0 8px;
  background: #fff4de;
  color: #8a5b07;
  font-size: 0.75rem;
  font-weight: 750;
}

.calculator-card h3 {
  font-size: 1rem;
  line-height: 1.3;
  margin: 0;
  overflow-wrap: anywhere;
}

.calculator-card p {
  color: var(--muted);
  margin: 0;
  line-height: 1.45;
  font-size: 0.9rem;
  overflow-wrap: anywhere;
}

.card-category {
  margin-top: auto;
  color: var(--teal-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

.page-title-band {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.title-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--teal-dark);
  text-decoration: none;
}

.title-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: center;
}

.title-icon {
  width: 58px;
  height: 58px;
  border-radius: 8px;
  background: var(--surface-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.title-inner h1 {
  font-size: 2.1rem;
  line-height: 1.15;
  margin: 0 0 8px;
}

.title-inner p {
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 22px;
  align-items: start;
}

.calculator-panel {
  padding: 24px;
}

.field-grid {
  display: grid;
  gap: 16px;
}

.field-group label,
.scale-label {
  display: block;
  font-weight: 750;
  margin-bottom: 7px;
  overflow-wrap: anywhere;
}

.field-hint {
  color: var(--muted);
  font-size: 0.82rem;
  margin-top: 5px;
}

.scale-input {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(42px, 1fr));
  gap: 8px;
}

.scale-btn {
  min-height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  cursor: pointer;
}

.scale-btn.selected,
.scale-btn:hover,
.scale-btn:focus-visible {
  border-color: var(--teal);
  background: var(--surface-soft);
  color: var(--teal-dark);
  outline: none;
}

.checklist-grid {
  display: grid;
  gap: 8px;
}

.checklist-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  min-width: 0;
}

.checklist-item span {
  overflow-wrap: anywhere;
}

.checklist-item:hover {
  border-color: rgba(15, 143, 130, 0.4);
  background: var(--surface-soft);
}

.actions-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.result-box {
  display: none;
  margin-top: 22px;
  border: 1px solid rgba(15, 143, 130, 0.28);
  border-radius: 8px;
  background: #f0faf6;
  padding: 20px;
}

.result-box.show {
  display: block;
}

.result-label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}

.result-value {
  color: var(--teal-dark);
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.1;
  margin: 6px 0 2px;
  overflow-wrap: anywhere;
}

.result-unit,
.result-advice,
.result-detail {
  color: var(--muted);
  line-height: 1.55;
}

.result-interpretation {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  border-radius: 8px;
  padding: 0 10px;
  margin-top: 12px;
  font-weight: 800;
}

.result-details {
  margin: 12px 0 0;
  padding-left: 18px;
}

.result-details li {
  margin: 6px 0;
}

.content-section {
  padding: 22px;
  margin-top: 18px;
}

.content-section p {
  color: var(--muted);
  line-height: 1.7;
}

.faq-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.faq-item summary {
  cursor: pointer;
  padding: 15px 16px;
  font-weight: 750;
}

.faq-item p {
  padding: 0 16px 16px;
  margin: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.related-card {
  padding: 14px;
  text-decoration: none;
}

.related-card:hover,
.related-card:focus-visible {
  border-color: rgba(15, 143, 130, 0.42);
  outline: none;
}

.sidebar {
  position: sticky;
  top: 86px;
  display: grid;
  gap: 14px;
}

.sidebar-panel {
  padding: 16px;
}

.sidebar-panel h2,
.sidebar-panel h3 {
  font-size: 0.92rem;
  margin: 0 0 12px;
}

.mini-list {
  display: grid;
  gap: 8px;
}

.mini-link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
  padding: 8px;
  border-radius: 8px;
}

.mini-link:hover,
.mini-link:focus-visible {
  background: var(--surface-soft);
  outline: none;
}

.notice {
  padding: 14px;
  background: #fff9e8;
  border-color: #eed49d;
  color: #5e4616;
  line-height: 1.55;
}

.ad-slot {
  border: 1px dashed #cbd8d3;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.54);
  color: var(--muted);
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  text-align: center;
  padding: 10px;
}

.site-footer {
  background: #10221e;
  color: rgba(255, 255, 255, 0.72);
  margin-top: auto;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px;
  display: grid;
  gap: 12px;
}

.footer-inner a {
  color: #ffffff;
}

.empty-state {
  grid-column: 1 / -1;
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 28px;
  text-align: center;
  color: var(--muted);
}

html[dir="rtl"] .header-inner,
html[dir="rtl"] .title-row,
html[dir="rtl"] .card-top,
html[dir="rtl"] .mini-link {
  direction: rtl;
}

@media (max-width: 900px) {
  .hero-inner,
  .calculator-layout {
    grid-template-columns: 1fr;
  }

  .hero-stat,
  .sidebar {
    position: static;
  }

  .hero-stat {
    max-width: 420px;
  }
}

@media (max-width: 640px) {
  body {
    overflow-x: hidden;
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 14px;
    gap: 10px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
    align-items: center;
  }

  .hero-inner {
    padding: 28px 14px 22px;
    gap: 18px;
  }

  .hero h1,
  .title-inner h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero-stat {
    width: 100%;
    padding: 18px;
  }

  .hero-stat strong {
    font-size: 2.4rem;
  }

  .main {
    padding: 20px 14px 42px;
  }

  .search-row {
    grid-template-columns: 1fr;
  }

  .category-tabs {
    margin-left: -14px;
    margin-right: -14px;
    padding-left: 14px;
    padding-right: 14px;
  }

  .calculator-grid,
  .related-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .calculator-card {
    min-height: 0;
    padding: 16px;
  }

  .section-header {
    display: block;
  }

  .calculator-panel,
  .content-section {
    padding: 18px;
  }

  .title-inner {
    padding: 22px 14px;
  }

  .title-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
  }

  .title-icon {
    width: 44px;
    height: 44px;
    font-size: 1.45rem;
  }

  .field-grid,
  .actions-row {
    gap: 12px;
  }

  .actions-row .button {
    width: 100%;
  }

  .scale-input {
    grid-template-columns: repeat(auto-fit, minmax(52px, 1fr));
  }

  .checklist-item {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .checklist-item span:last-child {
    grid-column: 2;
    justify-self: start;
    color: var(--muted);
    font-size: 0.82rem;
  }

  .result-box {
    padding: 16px;
  }

  .result-value {
    font-size: 1.85rem;
  }

  .ch-lang-wrapper,
  .ch-lang-btn {
    max-width: 100%;
  }

  .ch-lang-label {
    max-width: 132px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .ch-lang-menu {
    left: 0;
    right: auto;
    max-width: calc(100vw - 28px);
  }
}