:root {
  --bg: #ffffff;
  --surface: #f6fbfc;
  --surface-strong: #eef7f8;
  --text: #14313d;
  --muted: #5d7280;
  --blue: #0e6ba8;
  --blue-dark: #094d78;
  --teal: #0d9488;
  --teal-dark: #0f766e;
  --border: #d8e7eb;
  --warning: #a15c00;
  --danger: #b42318;
  --success: #087443;
  --shadow: 0 18px 55px rgba(13, 80, 102, 0.12);
  --radius: 8px;
  --max: 1180px;
}

* { 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;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }
img, svg { max-width: 100%; }
button, input, select, textarea { font: inherit; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus, button:focus-visible, a:focus-visible {
  outline: 3px solid rgba(14, 107, 168, 0.28);
  outline-offset: 3px;
}

.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  background: var(--blue-dark);
  color: #fff;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  z-index: 20;
}
.skip-link:focus { top: 1rem; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
}
.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.nav-menu {
  display: none;
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: 72px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow);
}
.nav-menu.is-open { display: grid; gap: 0.7rem; }
.nav-menu a { color: var(--text); font-weight: 650; }
.nav-toggle {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius);
}

.hero {
  background:
    radial-gradient(circle at 85% 20%, rgba(13, 148, 136, 0.14), transparent 26rem),
    linear-gradient(180deg, #f8fdfe 0%, #ffffff 100%);
  padding: 4rem 0 3rem;
}
.hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--teal-dark);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}
h1, h2, h3 { line-height: 1.15; margin: 0 0 1rem; letter-spacing: 0; }
h1 { font-size: clamp(2.4rem, 8vw, 5.4rem); }
h2 { font-size: clamp(1.65rem, 4vw, 2.6rem); }
h3 { font-size: 1.15rem; }
.tagline {
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  color: var(--blue-dark);
  font-weight: 760;
  margin: 0 0 1rem;
}
.hero-text, .page-hero p { color: var(--muted); font-size: 1.07rem; max-width: 68ch; }
.hero-search {
  display: grid;
  gap: 0.75rem;
  margin: 1.5rem 0 1rem;
  position: relative;
}
.hero-actions, .filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-weight: 780;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { background: var(--blue); color: #fff; box-shadow: 0 12px 28px rgba(14, 107, 168, 0.22); }
.button-primary:hover { background: var(--blue-dark); color: #fff; }
.button-secondary { background: #fff; color: var(--blue-dark); border-color: var(--border); }
.button-light { background: #fff; color: var(--blue-dark); }
.chip {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 999px;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  font-weight: 700;
}
.chip[aria-pressed="true"] { background: var(--blue); color: #fff; border-color: var(--blue); }

.hero-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  padding: 1rem;
  box-shadow: var(--shadow);
}
.mini-toolbar { display: flex; gap: 0.35rem; padding-bottom: 1rem; }
.mini-toolbar span { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.metric-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}
.metric-row div {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.metric-row strong, .metric-row span { display: block; }
.metric-row span { font-size: 2rem; font-weight: 850; color: var(--teal-dark); }
.chart-bars {
  height: 160px;
  display: flex;
  align-items: end;
  gap: 0.7rem;
  padding: 1rem 0;
}
.chart-bars span {
  flex: 1;
  background: linear-gradient(180deg, var(--teal), var(--blue));
  border-radius: 8px 8px 0 0;
}
.chart-bars span:nth-child(1) { height: 45%; }
.chart-bars span:nth-child(2) { height: 70%; }
.chart-bars span:nth-child(3) { height: 35%; }
.chart-bars span:nth-child(4) { height: 82%; }
.chart-bars span:nth-child(5) { height: 58%; }

.section { padding: 4rem 0; }
.section-muted { background: var(--surface); }
.section-heading { max-width: 780px; margin-bottom: 1.6rem; }
.card-grid, .category-grid, .testimonial-grid, .learning-grid {
  display: grid;
  gap: 1rem;
}
.tool-card, .category-card, .learning-card, .form-card, .contact-aside, .calc-panel, .content-panel, .result-panel, blockquote {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: 1.2rem;
}
.tool-card {
  display: grid;
  align-content: space-between;
  gap: 1rem;
  min-height: 230px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.tool-card .category { color: var(--teal-dark); font-weight: 800; font-size: 0.82rem; }
.tool-card p, .category-card p, .learning-card p, blockquote { color: var(--muted); }
.category-card { color: var(--text); }
.category-card span { display: block; font-weight: 850; font-size: 1.15rem; margin-bottom: 0.45rem; }
.stats-band {
  background: var(--blue-dark);
  color: #fff;
  padding: 2.4rem 0;
}
.stats-grid { display: grid; gap: 1rem; }
.stats-grid strong { display: block; font-size: 2.3rem; }
.stats-grid span { color: #d8eef4; }
.split { display: grid; gap: 1.5rem; align-items: start; }
.check-list {
  display: grid;
  gap: 0.75rem;
}
.check-list p {
  margin: 0;
  padding: 1rem;
  border-left: 4px solid var(--teal);
  background: var(--surface);
  border-radius: var(--radius);
}
blockquote { margin: 0; }
blockquote cite { display: block; margin-top: 1rem; color: var(--text); font-weight: 800; font-style: normal; }
.cta-section {
  background: linear-gradient(135deg, var(--blue-dark), var(--teal-dark));
  color: #fff;
  padding: 3.5rem 0;
}
.cta-inner { display: grid; gap: 1rem; align-items: center; }
.cta-inner p { color: #dff6f5; margin: 0; }

.page-shell { background: linear-gradient(180deg, #f8fdfe 0, #fff 360px); }
.page-hero { padding: 3.5rem 0 1.5rem; }
.tool-controls {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
  position: relative;
}
.search-suggestions {
  display: none;
  grid-column: 1 / -1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
  z-index: 5;
}
.search-suggestions.is-open {
  display: grid;
}
.suggestion-link {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 1rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.suggestion-link:last-child {
  border-bottom: 0;
}
.suggestion-link:hover,
.suggestion-link:focus {
  background: var(--surface);
  color: var(--text);
}
.suggestion-link strong {
  line-height: 1.2;
}
.suggestion-link span {
  color: var(--muted);
  font-size: 0.9rem;
}
.tool-list { display: grid; gap: 2rem; }
.tool-section h2 { margin-bottom: 1rem; }
.tool-section-grid { display: grid; gap: 1rem; }
.tool-page-grid {
  display: grid;
  gap: 1rem;
  align-items: start;
}
.calc-form { display: grid; gap: 0.9rem; }
.calc-form label { display: grid; gap: 0.35rem; font-weight: 720; }
.field-hint { color: var(--muted); font-size: 0.9rem; font-weight: 500; }
.result-panel {
  background: var(--surface);
  border-color: #c5e7e4;
}
.result-value { font-size: clamp(1.8rem, 8vw, 3rem); font-weight: 850; color: var(--teal-dark); margin: 0; }
.error-text { color: var(--danger); font-weight: 720; }
.content-stack { display: grid; gap: 1rem; }
.content-stack article, .reference-list, .faq-list {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
}
.content-stack article:last-child { border-bottom: 0; }
.formula {
  display: block;
  overflow-x: auto;
  background: #eef8fb;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-weight: 800;
}
.contact-grid { display: grid; gap: 1rem; }
.form-card { display: grid; gap: 1rem; }
.form-card label { display: grid; gap: 0.4rem; font-weight: 720; }
.form-note { color: var(--success); font-weight: 720; }

.site-footer {
  background: #102f3b;
  color: #e5f4f6;
  padding: 3rem 0;
}
.footer-grid {
  display: grid;
  gap: 1.5rem;
}
.footer-grid a { color: #e5f4f6; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1rem;
}
.footer-small { color: #bdd8df; font-size: 0.92rem; }

@media (min-width: 700px) {
  .hero-search { grid-template-columns: 1fr auto; }
  .card-grid, .category-grid, .testimonial-grid, .learning-grid, .tool-section-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .cta-inner { grid-template-columns: 1fr auto; }
  .contact-grid { grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr); }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .nav-menu {
    position: static;
    display: flex;
    align-items: center;
    gap: 1.3rem;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
  }
  .hero-grid { grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.72fr); }
  .split { grid-template-columns: minmax(0, 1fr) minmax(360px, 0.8fr); }
  .tool-page-grid { grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.55fr); }
  .tool-section-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}