:root {
  --primary: #0f62fe;
  --blue-60: #0043ce;
  --blue-80: #002d9c;
  --ink: #161616;
  --ink-muted: #525252;
  --ink-subtle: #8c8c8c;
  --canvas: #ffffff;
  --surface-1: #f4f4f4;
  --surface-2: #e0e0e0;
  --inverse-canvas: #161616;
  --inverse-surface-1: #262626;
  --inverse-ink: #ffffff;
  --inverse-ink-muted: #c6c6c6;
  --hairline: #e0e0e0;
  --hairline-strong: #161616;
  --success: #24a148;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--canvas);
  margin: 0;
  line-height: 1.5;
  letter-spacing: 0.16px;
}

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 300;
  margin: 0 0 20px;
}
h1 { font-size: 42px; line-height: 1.2; }
h2 { font-size: 32px; font-weight: 400; line-height: 1.25; }
h3 { font-size: 24px; font-weight: 400; line-height: 1.33; }
h4 { font-size: 20px; font-weight: 400; }

p { margin: 0 0 16px; }

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--blue-60); }
a:active { color: var(--blue-80); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; }
.section-alt { background: var(--surface-1); }

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 12px 20px;
  border: none;
  border-radius: 0;
  font-size: 14px;
  cursor: pointer;
}
.btn-primary:hover { background: var(--blue-hover, #0050e6); color: #fff; }
.btn-primary:active { background: var(--blue-80); }

.btn-secondary {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  padding: 12px 20px;
  border-radius: 0;
  font-size: 14px;
  border: none;
}

.btn-tertiary {
  display: inline-block;
  background: var(--canvas);
  color: var(--primary);
  padding: 12px 20px;
  border-radius: 0;
  font-size: 14px;
  border: 1px solid var(--primary);
}

.utility-bar {
  background: var(--surface-1);
  color: var(--ink-muted);
  font-size: 12px;
  height: 32px;
  display: flex;
  align-items: center;
}

.top-nav {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  z-index: 50;
}
.top-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  flex-wrap: wrap;
  gap: 12px;
}
.brand { font-size: 18px; font-weight: 400; color: var(--ink); }
.nav-links { display: flex; gap: 24px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.nav-links a { color: var(--ink); font-size: 14px; }

.layout-with-sidebar {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 900px) {
  .layout-with-sidebar { grid-template-columns: 1fr; }
}

.sidebar {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 24px;
  position: sticky;
  top: 72px;
}
.sidebar h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-muted); margin-bottom: 12px; font-weight: 400; }
.sidebar ul { list-style: none; margin: 0 0 20px; padding: 0; }
.sidebar li { margin-bottom: 8px; }
.sidebar a { color: var(--ink); font-size: 14px; }

.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 24px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .card-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 600px) { .card-grid { grid-template-columns: 1fr; } }

.cta-banner {
  background: var(--primary);
  color: #fff;
  padding: 48px;
}
.cta-banner h2 { color: #fff; }

.timeline {
  border-left: 2px solid var(--hairline);
  margin-left: 12px;
  padding-left: 32px;
}
.timeline-item { position: relative; padding-bottom: 32px; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 4px;
  width: 10px;
  height: 10px;
  background: var(--primary);
}
.timeline-date { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-muted); margin-bottom: 4px; }

.breadcrumb { font-size: 13px; color: var(--ink-muted); margin-bottom: 24px; }
.breadcrumb a { color: var(--ink-muted); }
.breadcrumb span { margin: 0 6px; }

.toc { background: var(--surface-1); padding: 24px; margin-bottom: 32px; border-left: 3px solid var(--primary); }
.toc h4 { margin-bottom: 12px; font-size: 15px; }
.toc ul { margin: 0; padding-left: 20px; }
.toc li { margin-bottom: 6px; }

.related-content { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--hairline); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .related-grid { grid-template-columns: 1fr; } }
.related-grid a {
  display: block;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 16px;
  color: var(--ink);
  font-size: 15px;
}

img { max-width: 100%; height: auto; display: block; }

table { width: 100%; border-collapse: collapse; margin-bottom: 24px; }
th, td { border: 1px solid var(--hairline); padding: 12px; text-align: left; font-size: 14px; }
th { background: var(--surface-1); font-weight: 600; }

details { border: 1px solid var(--hairline); padding: 16px 20px; margin-bottom: 12px; }
summary { font-weight: 600; color: var(--ink); cursor: pointer; }

footer { background: var(--inverse-canvas); color: var(--inverse-ink-muted); padding: 64px 0 32px; font-size: 14px; }
.footer-columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-bottom: 32px; }
@media (max-width: 900px) { .footer-columns { grid-template-columns: 1fr; } }
.footer-columns h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--inverse-ink); margin-bottom: 12px; font-weight: 400; }
.footer-columns ul { list-style: none; padding: 0; margin: 0; }
.footer-columns li { margin-bottom: 8px; }
.footer-columns a { color: var(--inverse-ink-muted); }
.footer-legal { border-top: 1px solid var(--inverse-surface-1); padding-top: 24px; font-size: 13px; color: var(--inverse-ink-muted); }
.footer-legal p { margin-bottom: 8px; }

.cookie-banner {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--inverse-canvas);
  color: #fff;
  padding: 20px 24px;
  display: none;
  z-index: 100;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.cookie-banner.visible { display: flex; }
.cookie-banner p { margin: 0; font-size: 14px; max-width: 640px; }
.cookie-actions { display: flex; gap: 12px; }
.cookie-actions button { border-radius: 0; padding: 12px 20px; font-weight: 600; font-size: 13px; border: none; cursor: pointer; }
.cookie-accept { background: var(--primary); color: #fff; }
.cookie-reject { background: transparent; color: #fff; border: 1px solid #fff !important; }

form.contact-form { max-width: 520px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.form-group input {
  width: 100%;
  height: 44px;
  border: none;
  border-bottom: 1px solid var(--hairline);
  background: var(--surface-1);
  padding: 11px 16px;
  font-size: 14px;
  font-family: inherit;
}
.form-group input:focus { outline: none; border-bottom: 2px solid var(--primary); }
.form-error { color: #da1e28; font-size: 13px; margin-top: 4px; display: none; }
.form-error.visible { display: block; }
.form-success {
  background: var(--surface-1);
  border-left: 3px solid var(--success);
  color: var(--success);
  padding: 16px;
  margin-top: 16px;
  display: none;
}
.form-success.visible { display: block; }
.submit-btn[disabled] { opacity: 0.6; cursor: not-allowed; }

.disclaimer-box {
  background: var(--surface-1);
  border-left: 3px solid var(--ink-subtle);
  padding: 16px 20px;
  font-size: 13px;
  color: var(--ink-muted);
  margin: 24px 0;
}

.hero { padding: 64px 0; }
.hero p.lead { font-size: 18px; color: var(--ink-muted); max-width: 720px; }
.tag {
  display: inline-block;
  background: var(--surface-1);
  color: var(--ink-muted);
  font-size: 12px;
  padding: 4px 10px;
  margin-bottom: 12px;
}