@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;700&display=swap');

:root {
  --canvas: #000000;
  --surface-soft: #0d0d0d;
  --surface-card: #1a1a1a;
  --surface-elevated: #262626;
  --carbon-gray: #2b2b2b;
  --hairline: #3c3c3c;
  --on-dark: #ffffff;
  --body: #bbbbbb;
  --body-strong: #e6e6e6;
  --muted: #7e7e7e;
  --m-blue-light: #0066b1;
  --m-blue-dark: #1c69d4;
  --m-red: #e22718;
  --warning: #f4b400;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--canvas);
  color: var(--body);
  font-size: 16px;
  font-weight: 300;
  line-height: 1.5;
}

a { color: var(--on-dark); text-decoration: none; }
a:hover { color: var(--body-strong); }

h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--on-dark);
  text-transform: uppercase;
  letter-spacing: 0;
  line-height: 1.1;
}

h1 { font-size: clamp(40px, 6vw, 80px); }
h2 { font-size: clamp(28px, 4vw, 56px); }
h3 { font-size: clamp(22px, 3vw, 40px); }
h4 { font-size: 24px; }
h5 { font-size: 20px; font-weight: 400; color: var(--body-strong); line-height: 1.4; }
h6 { font-size: 18px; font-weight: 400; color: var(--body-strong); line-height: 1.4; }

p { margin-bottom: 1rem; font-weight: 300; color: var(--body); }

ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.4rem; font-weight: 300; color: var(--body); }

.m-stripe {
  height: 4px;
  background: linear-gradient(to right, var(--m-blue-light) 0%, var(--m-blue-dark) 50%, var(--m-red) 100%);
  width: 100%;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 0;
}

.container { max-width: 1440px; margin: 0 auto; padding: 0 1.5rem; }

.site-header {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--on-dark);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.site-logo span { color: var(--m-blue-light); }

.main-nav { display: flex; align-items: center; gap: 2rem; list-style: none; }
.main-nav a {
  font-size: 14px;
  font-weight: 400;
  color: var(--body);
  letter-spacing: 0.5px;
  transition: color 0.2s;
}
.main-nav a:hover, .main-nav a.active { color: var(--on-dark); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--on-dark);
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--canvas);
  z-index: 200;
  flex-direction: column;
}
.mobile-nav-overlay.open { display: flex; }
.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 64px;
  border-bottom: 1px solid var(--hairline);
}
.mobile-nav-close {
  background: none;
  border: none;
  color: var(--on-dark);
  font-size: 28px;
  cursor: pointer;
}
.mobile-nav-links {
  list-style: none;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.mobile-nav-links a { font-size: 20px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: var(--on-dark); }

.hero-band {
  background: var(--canvas);
  padding: 96px 0;
  border-bottom: 1px solid var(--hairline);
}
.hero-band .hero-kicker {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--m-blue-light);
  margin-bottom: 1.5rem;
}
.hero-band h1 { max-width: 900px; margin-bottom: 1.5rem; }
.hero-band .hero-lead {
  font-size: 18px;
  font-weight: 300;
  color: var(--body-strong);
  max-width: 680px;
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 0 32px;
  height: 48px;
  line-height: 48px;
  border: 1px solid var(--on-dark);
  background: transparent;
  color: var(--on-dark);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  border-radius: 0;
  text-align: center;
}
.btn:hover { background: var(--on-dark); color: var(--canvas); }
.btn-secondary {
  border-color: var(--hairline);
  color: var(--body);
}
.btn-secondary:hover { background: var(--surface-card); color: var(--on-dark); border-color: var(--on-dark); }

.section-band { padding: 96px 0; }
.section-band + .section-band { border-top: 1px solid var(--hairline); }
.section-band.dark { background: var(--surface-soft); }

.section-label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
}

.card-grid { display: grid; gap: 1px; background: var(--hairline); }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.ref-card {
  background: var(--surface-card);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background 0.2s;
}
.ref-card:hover { background: var(--surface-elevated); }
.ref-card-kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--m-blue-light);
}
.ref-card h3 {
  font-size: 20px;
  line-height: 1.3;
  margin-bottom: 0;
}
.ref-card p { font-size: 14px; margin-bottom: 0; }
.ref-card .card-link {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--on-dark);
  margin-top: auto;
}
.ref-card .card-link:hover { color: var(--m-blue-light); }

.page-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  min-height: 60vh;
}
.page-sidebar {
  border-right: 1px solid var(--hairline);
  padding: 3rem 2rem;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}
.page-content { padding: 3rem 3rem; max-width: 860px; }

.sidebar-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}
.sidebar-nav { list-style: none; padding: 0; }
.sidebar-nav li + li { border-top: 1px solid var(--hairline); }
.sidebar-nav a {
  display: block;
  padding: 0.75rem 0;
  font-size: 14px;
  color: var(--body);
}
.sidebar-nav a:hover, .sidebar-nav a.active { color: var(--on-dark); }

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.breadcrumbs a { font-size: 13px; color: var(--muted); }
.breadcrumbs a:hover { color: var(--on-dark); }
.breadcrumbs .sep { color: var(--hairline); font-size: 13px; }
.breadcrumbs .current { font-size: 13px; color: var(--body); }

.article-header { margin-bottom: 3rem; padding-bottom: 2rem; border-bottom: 1px solid var(--hairline); }
.article-header .page-kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--m-blue-light);
  margin-bottom: 1rem;
}
.article-header h1 { font-size: clamp(28px, 4vw, 48px); margin-bottom: 1rem; }
.article-header .article-lead { font-size: 18px; font-weight: 300; color: var(--body-strong); line-height: 1.6; }

.toc-box {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  padding: 2rem;
  margin-bottom: 2.5rem;
}
.toc-box h4 {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--muted);
  margin-bottom: 1rem;
}
.toc-box ol { padding-left: 1.2rem; margin: 0; }
.toc-box li { margin-bottom: 0.5rem; }
.toc-box a { font-size: 14px; color: var(--body); }
.toc-box a:hover { color: var(--on-dark); }

.article-body h2 { font-size: clamp(22px, 3vw, 36px); margin-top: 3rem; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--hairline); }
.article-body h3 { font-size: clamp(18px, 2.5vw, 26px); margin-top: 2rem; margin-bottom: 0.75rem; }
.article-body h4 { font-size: 20px; margin-top: 1.5rem; margin-bottom: 0.5rem; }
.article-body p { line-height: 1.7; margin-bottom: 1.25rem; }
.article-body ul, .article-body ol { margin-bottom: 1.25rem; }
.article-body li { line-height: 1.6; }

.callout-box {
  background: var(--surface-card);
  border-left: 4px solid var(--m-blue-light);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
}
.callout-box p { margin: 0; font-size: 14px; color: var(--body-strong); }

.disclaimer-box {
  background: var(--surface-soft);
  border: 1px solid var(--hairline);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  font-size: 13px;
  color: var(--muted);
}

.faq-list { list-style: none; padding: 0; }
.faq-item { border-bottom: 1px solid var(--hairline); }
.faq-item:first-child { border-top: 1px solid var(--hairline); }
.faq-summary {
  list-style: none;
  padding: 1.5rem 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--on-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.faq-summary::-webkit-details-marker { display: none; }
.faq-summary .faq-icon { font-size: 20px; color: var(--muted); transition: transform 0.2s; }
details[open] .faq-icon { transform: rotate(45deg); }
.faq-body { padding-bottom: 1.5rem; padding-right: 2rem; }
.faq-body p { font-size: 15px; line-height: 1.7; margin-bottom: 0.75rem; }
.faq-body ul { margin-bottom: 0.75rem; }

.related-block { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--hairline); }
.related-block h5 {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
.related-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.related-links a {
  display: block;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  padding: 1rem 1.5rem;
  font-size: 14px;
  color: var(--body);
  transition: background 0.2s, color 0.2s;
}
.related-links a:hover { background: var(--surface-elevated); color: var(--on-dark); }

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand .footer-logo { font-size: 18px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: var(--on-dark); margin-bottom: 1rem; }
.footer-brand .footer-logo span { color: var(--m-blue-light); }
.footer-brand p { font-size: 14px; line-height: 1.6; }
.footer-col h6 { font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 1rem; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li + li { margin-top: 0.6rem; }
.footer-col a { font-size: 14px; color: var(--body); }
.footer-col a:hover { color: var(--on-dark); }
.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.footer-disclaimer { font-size: 13px; color: var(--muted); line-height: 1.6; }
.footer-copy { font-size: 13px; color: var(--muted); }

.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 0.5rem; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  color: var(--on-dark);
  font-size: 16px;
  font-weight: 300;
  padding: 12px 16px;
  height: 48px;
  border-radius: 0;
  font-family: inherit;
  transition: border-color 0.2s;
}
.form-group textarea { height: auto; min-height: 120px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--on-dark); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--muted); }

.form-status { display: none; padding: 1rem 1.5rem; margin-top: 1rem; font-size: 15px; }
.form-status.success { display: block; background: var(--surface-card); border: 1px solid var(--m-blue-light); color: var(--body-strong); }
.form-status.loading { display: block; background: var(--surface-card); border: 1px solid var(--hairline); color: var(--muted); }

.cookie-banner {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 24px;
  max-width: 360px;
  z-index: 999;
  display: none;
}
.cookie-banner.visible { display: block; }
.cookie-banner p { font-size: 14px; font-weight: 300; margin-bottom: 1.25rem; color: var(--body); }
.cookie-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.cookie-actions .btn { font-size: 12px; padding: 0 20px; height: 40px; line-height: 40px; }

.spec-table { width: 100%; border-collapse: collapse; margin: 2rem 0; }
.spec-table th {
  background: var(--surface-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--hairline);
}
.spec-table td {
  padding: 1rem;
  font-size: 14px;
  color: var(--body);
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
.spec-table tr:hover td { background: var(--surface-card); }

.page-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 0;
}

@media (max-width: 1024px) {
  .page-layout { grid-template-columns: 1fr; }
  .page-sidebar { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .card-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .nav-hamburger { display: flex; }
  .hero-band { padding: 64px 0; }
  .section-band { padding: 64px 0; }
  .card-grid.cols-3, .card-grid.cols-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .ref-card { padding: 24px; }
  .page-content { padding: 2rem 1rem; }
  .cookie-banner { left: 1rem; right: 1rem; bottom: 1rem; max-width: none; }
}