:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f8faff;
  --text: #111827;
  --muted: #667085;
  --line: #ebeff5;
  --line-strong: #dde4ef;
  --accent: #3b82f6;
  --accent-2: #8b5cf6;
  --accent-soft: #eef4ff;
  --shadow: 0 12px 28px rgba(17, 24, 39, 0.06);
  --shadow-soft: 0 8px 20px rgba(17, 24, 39, 0.04);
  --radius: 22px;
  --radius-sm: 18px;
  --container: 1180px;
  --header-h: 76px;
  --footer-h: 54px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
button, input, select, textarea { font: inherit; }
.container { width: min(var(--container), calc(100% - 30px)); margin: 0 auto; }

.site-header,
.site-footer {
  position: relative;
  width: 100%;
  z-index: 1;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(14px);
}
.site-header {
  border-bottom: 1px solid var(--line);
  box-shadow: 0 4px 14px rgba(17, 24, 39, 0.03);
}
.site-footer {
  margin-top: 24px;
  border-top: 1px solid var(--line);
  box-shadow: 0 -4px 14px rgba(17, 24, 39, 0.03);
}
.header-minimal-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: center;
}
.footer-minimal-inner {
  min-height: var(--footer-h);
  display: flex;
  align-items: center;
  justify-content: center;
}
.brand-centered {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.brand-logo {
  width: 42px;
  height: 42px;
  position: relative;
  flex: 0 0 42px;
}
.logo-orbit {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(59,130,246,0.18), rgba(139,92,246,0.18));
  border: 1px solid rgba(59,130,246,0.16);
}
.logo-core {
  position: absolute;
  inset: 6px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 12px 24px rgba(59,130,246,0.22);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3px;
  padding: 6px;
}
.logo-core i {
  display: block;
  border-radius: 4px;
  background: rgba(255,255,255,0.9);
}
.brand-copy {
  display: inline-flex;
  align-items: flex-end;
  gap: 6px;
  line-height: 1;
}
.brand-main {
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  font-weight: 800;
  letter-spacing: -0.05em;
}
.brand-sub {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: lowercase;
  color: #6b7280;
  letter-spacing: 0.02em;
  padding-bottom: 3px;
}
.footer-minimal-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}
.footer-minimal-links a {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}
.footer-minimal-links a:hover {
  color: var(--text);
}

.page-shell {
  padding-top: 18px;
  padding-bottom: 18px;
  min-height: 0;
}
.home-section,
.section {
  margin: 0 0 22px;
}
.card,
.home-card,
.mini-card,
.page-hero,
.calculator-box,
.info-box,
.legal-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}
.home-card,
.mini-card,
.page-hero.card,
.calculator-box.card,
.info-box.card,
.legal-card.card {
  padding: 18px;
}
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.section-head h2,
.section-title,
.page-hero h1 {
  margin: 0;
  font-size: clamp(1.12rem, 2vw, 1.4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}
.home-grid {
  display: grid;
  gap: 14px;
}
.home-grid-categories {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.home-grid-tools {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.icon-card {
  min-height: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.icon-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: rgba(59,130,246,0.22);
}
.home-card-title {
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1.35;
}
.icon-box {
  width: 68px;
  height: 68px;
  border-radius: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #f7faff 0%, #eef5ff 100%);
  border: 1px solid #dfe9fa;
  box-shadow: 0 8px 18px rgba(59,130,246,0.10);
}
.icon-box svg {
  width: 32px;
  height: 32px;
  stroke: #2563eb;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-finance svg,
.icon-birthday svg,
.icon-science svg { stroke: #7c3aed; }
.icon-health svg { stroke: #ef4444; }
.icon-business svg { stroke: #0f766e; }
.icon-education svg { stroke: #2563eb; }
.icon-duration svg { stroke: #7c3aed; }
.icon-age svg,
.icon-date svg,
.icon-conversion svg,
.icon-utility svg,
.icon-math svg { stroke: #2563eb; }

.mini-card {
  padding: 18px;
}
.mini-topbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-bottom: 12px;
}
.mini-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #2563eb;
  font-size: 0.78rem;
  font-weight: 700;
}
.mini-layout {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.mini-icon {
  width: 88px;
  height: 88px;
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #f7faff 0%, #edf4ff 100%);
  border: 1px solid #dfe9fa;
  box-shadow: 0 10px 22px rgba(59,130,246,0.08);
}
.mini-icon svg {
  width: 40px;
  height: 40px;
  stroke: #2563eb;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.mini-topline {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.mini-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.mini-link {
  font-size: 0.82rem;
  font-weight: 700;
  color: #2563eb;
}
.mini-form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.mini-form-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mini-form-grid.one { grid-template-columns: minmax(0, 1fr); }
.mini-form-grid input,
.mini-form-grid select {
  width: 100%;
  min-height: 46px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: #fff;
  outline: none;
}
.mini-form-grid input:focus,
.mini-form-grid select:focus,
input:focus,
select:focus,
textarea:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 4px rgba(59,130,246,0.08);
}
.mini-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}
.mini-btn,
.btn {
  border: 0;
  border-radius: 14px;
  min-height: 46px;
  padding: 0 18px;
  cursor: pointer;
  font-weight: 700;
}
.mini-btn,
.btn-primary {
  background: linear-gradient(135deg, #2563eb, #8b5cf6);
  color: #fff;
  box-shadow: 0 10px 20px rgba(59,130,246,0.20);
}
.btn-secondary {
  background: #f3f6fb;
  color: var(--text);
}
.mini-result,
.result-note {
  margin-top: 12px;
  min-height: 52px;
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-weight: 700;
  color: var(--text);
}

.section-title-row { display: none; }
.grid { display: grid; gap: 16px; }
.grid-categories { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-tools { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.category-card, .tool-card {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
}
.category-card h3, .tool-card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.category-card p, .tool-card p, .muted, .page-hero p { margin: 0; color: var(--muted); line-height: 1.7; }
.card-meta { display: inline-flex; margin-top: 14px; color: #2563eb; font-weight: 700; align-items: center; gap: 8px; }
.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #2563eb;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.breadcrumbs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 14px;
}
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--text); }
.breadcrumbs strong { color: var(--text); font-weight: 700; }
.breadcrumbs span { color: #c0c7d3; }
.page-hero.card { padding: 24px; }
.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 18px;
  align-items: start;
  margin-top: 18px;
}
.calculator-box.card, .info-box.card, .legal-card.card { padding: 22px; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.form-row { display: grid; gap: 8px; }
.form-row.full { grid-column: 1 / -1; }
label { font-size: 0.94rem; font-weight: 700; }
input, select, textarea {
  width: 100%;
  min-height: 50px;
  padding: 13px 15px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  outline: none;
}
textarea { min-height: 140px; resize: vertical; }
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}
.btn { min-height: 48px; }
.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}
.result-card {
  padding: 16px;
  border-radius: 18px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}
.result-label { color: var(--muted); font-size: 0.9rem; margin-bottom: 8px; }
.result-value { font-size: 1.18rem; font-weight: 800; letter-spacing: -0.03em; }
.list-box { display: grid; gap: 12px; margin-top: 18px; }
.list-item {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}
.related-list { display: grid; gap: 10px; }
.related-link {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--line);
  font-weight: 700;
}
.legal-card h1,
.legal-card h2,
.legal-card h3 { margin: 0 0 12px; letter-spacing: -0.03em; }
.legal-card p,
.legal-card li { color: var(--muted); line-height: 1.8; }

@media (max-width: 980px) {
  .home-grid-categories,
  .home-grid-tools {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .grid-categories,
  .grid-tools {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-grid {
    grid-template-columns: 1fr;
  }
  .mini-form-grid,
  .mini-form-grid.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  :root {
    --header-h: 70px;
    --footer-h: 76px;
  }
  .container {
    width: min(var(--container), calc(100% - 20px));
  }
  .brand-logo {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
  }
  .brand-main {
    font-size: 1.1rem;
  }
  .brand-sub {
    font-size: 0.62rem;
    padding-bottom: 2px;
  }
  .footer-minimal-links {
    gap: 12px 14px;
  }
  .footer-minimal-links a {
    font-size: 0.78rem;
  }
  .home-card,
  .mini-card,
  .page-hero.card,
  .calculator-box.card,
  .info-box.card,
  .legal-card.card {
    padding: 16px;
  }
  .home-grid-categories,
  .home-grid-tools {
    gap: 10px;
  }
  .icon-card {
    min-height: 92px;
    gap: 8px;
    padding: 12px 8px;
    border-radius: 18px;
  }
  .home-card-title {
    font-size: 0.72rem;
    line-height: 1.22;
  }
  .icon-box {
    width: 44px;
    height: 44px;
    border-radius: 14px;
  }
  .icon-box svg {
    width: 22px;
    height: 22px;
  }
  .mini-layout {
    grid-template-columns: 1fr;
  }
  .mini-icon {
    width: 74px;
    height: 74px;
    border-radius: 24px;
  }
  .mini-form-grid,
  .mini-form-grid.one,
  .mini-form-grid.two,
  .form-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }
  .page-shell {
    padding-top: 14px;
  }
}

@media (max-width: 420px) {
  .section-head h2 {
    font-size: 1rem;
  }
  .icon-card {
    min-height: 86px;
    padding: 10px 6px;
  }
  .home-card-title {
    font-size: 0.68rem;
  }
  .icon-box {
    width: 40px;
    height: 40px;
  }
  .icon-box svg {
    width: 20px;
    height: 20px;
  }
}