@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --background: #f7f9fb;
  --foreground: #162033;
  --card: #ffffff;
  --muted: #f1f4f8;
  --muted-text: #687385;
  --border: #dce2ea;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --green: #16a34a;
  --radius: 8px;
  --shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--foreground);
  background: var(--background);
}

a {
  color: var(--primary);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 249, 251, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner,
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

.header-inner {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 800;
  text-decoration: none;
  color: var(--foreground);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 14px;
}

.site-nav a {
  color: var(--muted-text);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--foreground);
}

.hero {
  text-align: center;
  padding: 46px 0 24px;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 54px);
  letter-spacing: -0.02em;
  line-height: 1.05;
}

h2 {
  margin: 0 0 10px;
  font-size: 26px;
}

h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

p {
  line-height: 1.7;
}

.lead {
  max-width: 760px;
  margin: 18px auto 0;
  color: var(--muted-text);
  font-size: 18px;
}

.section {
  margin: 42px 0;
}

.narrow {
  max-width: 780px;
}

.muted {
  color: var(--muted-text);
}

.last-updated {
  margin: -2px 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted-text);
}

.ad-placeholder {
  display: flex;
  justify-content: center;
  margin: 32px 0;
}

.ad-box {
  width: min(728px, 100%);
  min-height: 96px;
  border: 1px dashed var(--border);
  background: rgba(241, 244, 248, 0.75);
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted-text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.controls {
  display: grid;
  gap: 14px;
  margin-bottom: 20px;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--foreground);
  border-radius: 7px;
  padding: 11px 12px;
  font: inherit;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(37, 99, 235, 0.22);
  border-color: var(--primary);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button,
.button {
  border: 0;
  border-radius: 7px;
  padding: 9px 14px;
  background: var(--muted);
  color: var(--foreground);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

button:hover,
.button:hover {
  background: #e6ebf2;
}

button.active,
.primary-button {
  background: var(--primary);
  color: #fff;
}

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

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  min-width: 980px;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  text-align: left;
  padding: 13px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  background: var(--muted);
  font-weight: 700;
}

tr:last-child td {
  border-bottom: 0;
}

td.mono {
  font-family: var(--mono);
  white-space: nowrap;
}

td.warning {
  color: var(--danger);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.formula {
  margin: 18px 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted-text);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.result-box {
  border: 1px solid rgba(37, 99, 235, 0.2);
  background: rgba(37, 99, 235, 0.05);
  border-radius: var(--radius);
  padding: 16px;
}

.result-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-value {
  margin-top: 4px;
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
}

.checklist-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  margin-bottom: 16px;
}

.progress {
  height: 7px;
  background: var(--muted);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 18px;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: var(--primary);
  transition: width 0.2s ease;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.check-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--border);
  background: var(--background);
  border-radius: var(--radius);
  padding: 12px;
  color: var(--muted-text);
}

.check-item.checked {
  background: rgba(37, 99, 235, 0.05);
  border-color: rgba(37, 99, 235, 0.3);
  color: var(--foreground);
}

.content-grid {
  display: grid;
  gap: 28px;
}

.faq-item {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  background: var(--card);
  padding: 16px;
  text-align: left;
}

.faq-answer {
  display: none;
  padding: 0 16px 16px;
  color: var(--muted-text);
  font-size: 14px;
}

.faq-item.open .faq-answer {
  display: block;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.tool-card {
  display: block;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  text-decoration: none;
  color: var(--foreground);
}

.tool-card:hover {
  border-color: rgba(37, 99, 235, 0.35);
  background: var(--muted);
}

.tool-card span {
  display: block;
  margin-top: 4px;
  color: var(--muted-text);
  font-size: 12px;
}

.disclaimer-box {
  border: 1px solid var(--border);
  background: var(--muted);
  border-radius: var(--radius);
  padding: 18px;
}

.site-footer {
  margin-top: 48px;
  border-top: 1px solid var(--border);
  background: rgba(241, 244, 248, 0.7);
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px 20px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 14px;
}

.footer-links a {
  color: var(--muted-text);
  text-decoration: none;
}

.copyright {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted-text);
}

.legal-page {
  max-width: 780px;
  margin: 0 auto;
  padding: 46px 20px;
}

.legal-page h1 {
  font-size: 38px;
}

.legal-page section {
  margin-top: 28px;
}

.contact-form {
  display: grid;
  gap: 14px;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .site-nav {
    gap: 12px;
  }

  .calc-grid,
  .result-grid,
  .checklist-grid,
  .tools-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 32px;
  }
}

.result-count {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

/* Article / guide pages */
.article {
  max-width: 760px;
}
.article article h1 {
  font-size: 34px;
  line-height: 1.2;
}
.article article h2 {
  margin-top: 34px;
  font-size: 22px;
}
.article article p {
  color: var(--muted-text);
  line-height: 1.7;
  margin: 14px 0;
}
.article article a {
  color: var(--primary);
}
.article-cta {
  margin-top: 40px;
  padding: 18px 20px;
  background: var(--muted);
  border-radius: 10px;
}
.article-cta p {
  margin: 0;
  color: var(--text, #1f2937);
}