:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-muted: #eef3fb;
  --text: #152033;
  --text-soft: #58657a;
  --border: #d6dfed;
  --primary: #2558f5;
  --primary-dark: #1744cc;
  --shadow: 0 18px 48px rgba(24, 39, 75, 0.08);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

button,
input,
textarea,
select {
  font: inherit;
}

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

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid rgba(37, 88, 245, 0.18);
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

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

.container.narrow {
  width: min(760px, calc(100% - 32px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(248, 251, 255, 0.88);
  border-bottom: 1px solid rgba(214, 223, 237, 0.8);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #7aa2ff);
  color: #fff;
  font-weight: 800;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 1rem;
}

.brand-copy span {
  color: var(--text-soft);
  font-size: 0.9rem;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav-link {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--text-soft);
  font-weight: 600;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  background: rgba(37, 88, 245, 0.08);
  color: var(--primary);
}

.hero,
.page-hero {
  padding: 72px 0 32px;
}

.hero-grid,
.split-grid,
.tool-layout,
.article-layout {
  display: grid;
  gap: 24px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  align-items: center;
}

.hero-copy h1,
.page-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: 1.06;
}

.hero-copy p,
.page-hero p,
.section-heading p,
.info-card p,
.tool-card p,
.faq-item p,
.prose p,
.site-footer p {
  color: var(--text-soft);
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(37, 88, 245, 0.08);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.cta-row,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.top-gap {
  margin-top: 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 14px;
  font-weight: 700;
  cursor: pointer;
}

.button-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 28px rgba(37, 88, 245, 0.22);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--primary-dark);
}

.button-secondary {
  background: #fff;
  border-color: var(--border);
  color: var(--text);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
}

.hero-panel,
.metric-card,
.tool-shell,
.tool-sidebar,
.article-card,
.tool-card,
.info-card,
.faq-item {
  background: var(--surface);
  border: 1px solid rgba(214, 223, 237, 0.9);
  box-shadow: var(--shadow);
}

.hero-panel {
  display: grid;
  gap: 14px;
  padding: 20px;
  border-radius: var(--radius-lg);
}

.metric-card {
  padding: 20px;
  border-radius: var(--radius-md);
}

.metric-card strong {
  display: block;
  font-size: 1.8rem;
  margin-bottom: 4px;
}

.metric-card span {
  color: var(--text-soft);
}

.content-section {
  padding: 32px 0;
}

.section-soft {
  background: rgba(255, 255, 255, 0.5);
}

.section-heading {
  margin-bottom: 20px;
}

.section-heading h2,
.tool-panel h2,
.info-card h2,
.faq-item h3,
.prose h2 {
  margin: 0 0 10px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tool-card,
.info-card,
.faq-item {
  padding: 22px;
  border-radius: var(--radius-lg);
}

.tool-category {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
}

.text-link {
  color: var(--primary);
  font-weight: 700;
}

.split-grid {
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  align-items: start;
}

.stack {
  display: grid;
  gap: 18px;
}

.faq-list {
  display: grid;
  gap: 18px;
}

.tool-layout {
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.8fr);
  align-items: start;
}

.article-layout {
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: start;
}

.tool-shell {
  padding: 24px;
  border-radius: var(--radius-lg);
  display: grid;
  gap: 18px;
}

.article-card {
  padding: 28px;
  border-radius: var(--radius-lg);
}

.tool-panel {
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--surface-muted);
}

.tool-panel.full {
  width: 100%;
}

.form-grid.two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.result-list,
.stats-grid {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.result-card {
  padding: 16px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--border);
}

.result-card strong {
  display: block;
  margin-bottom: 6px;
}

.result-card code,
.status-text {
  color: var(--text-soft);
}

.checkbox-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 14px 0;
  color: var(--text-soft);
}

.checkbox-row label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-weight: 500;
}

.status-text {
  margin: 14px 0;
}

.simple-list {
  margin: 0;
  padding-left: 18px;
}

.simple-list li + li {
  margin-top: 8px;
}

.prose h2 {
  margin-top: 26px;
}

.prose p:first-child {
  margin-top: 0;
}

.prose a,
.info-card a,
.site-footer a {
  color: var(--primary);
}

.site-footer {
  margin-top: 48px;
  padding: 36px 0 28px;
  background: #0f1728;
  color: #dce7ff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  gap: 24px;
}

.site-footer h2 {
  margin-top: 0;
  color: #fff;
  font-size: 1rem;
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid rgba(220, 231, 255, 0.14);
}

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

@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-grid.three,
  .split-grid,
  .tool-layout,
  .article-layout,
  .footer-grid,
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .header-row {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 0;
  }

  .main-nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .hero,
  .page-hero {
    padding-top: 44px;
  }

  .card-grid,
  .card-grid.three,
  .stats-grid,
  .form-grid.two {
    grid-template-columns: 1fr;
  }

  .tool-shell,
  .tool-card,
  .info-card,
  .faq-item {
    padding: 18px;
  }

  .footer-meta {
    flex-direction: column;
  }
}