:root {
  --bg: #070b14;
  --bg-card: #0d1424;
  --bg-elevated: #121d33;
  --deep-blue: #0a2540;
  --deep-blue-2: #14365e;
  --icy-blue: #5ec8e8;
  --icy-blue-bright: #7dd8f0;
  --icy-blue-dim: #3a9bc4;
  --accent: #00d4ff;
  --text: #dfeaf2;
  --text-muted: #8ba3b8;
  --text-dim: #7690a6;
  --border: #1a2a42;
  --border-light: #243a56;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(94, 200, 232, 0.12);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.7; font-size: 17px; -webkit-font-smoothing: antialiased; }
a { color: var(--icy-blue); text-decoration: none; }
a:hover { color: var(--icy-blue-bright); text-decoration: underline; }
.skip-link { position: absolute; top: -100px; left: 0; background: var(--icy-blue); color: var(--bg); padding: 12px 20px; border-radius: 0 0 var(--radius-sm) 0; z-index: 1000; font-weight: 600; }
.skip-link:focus { top: 0; text-decoration: none; }
:focus-visible { outline: 2px solid var(--icy-blue); outline-offset: 3px; border-radius: 4px; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; }
.section--alt { background: var(--bg-card); }
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(7, 11, 20, 0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: var(--max-width); margin: 0 auto; }
.nav__logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.nav__logo:hover { text-decoration: none; }
.nav__logo svg { flex-shrink: 0; }
.nav__links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav__links a { color: var(--text-muted); font-size: 0.95rem; font-weight: 500; text-decoration: none; transition: color 0.2s; }
.nav__links a:hover { color: var(--icy-blue); text-decoration: none; }
.nav__cta { background: var(--icy-blue); color: var(--bg) !important; padding: 8px 18px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.9rem; transition: background 0.2s, transform 0.15s; }
.nav__cta:hover { background: var(--icy-blue-bright); text-decoration: none; transform: translateY(-1px); }
.nav__toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.5rem; cursor: pointer; padding: 4px 8px; }
.hero { position: relative; overflow: hidden; padding: 80px 0 64px; background: linear-gradient(180deg, var(--deep-blue) 0%, var(--bg) 100%); }
.hero::before { content: ''; position: absolute; top: -200px; right: -100px; width: 500px; height: 500px; background: radial-gradient(circle, rgba(94, 200, 232, 0.08) 0%, transparent 70%); pointer-events: none; }
.hero__inner { position: relative; z-index: 1; }
.hero h1 { font-size: 2.8rem; line-height: 1.2; font-weight: 800; margin-bottom: 20px; max-width: 700px; }
.hero h1 .accent { color: var(--icy-blue); }
.hero__lead { font-size: 1.2rem; color: var(--text-muted); max-width: 600px; margin-bottom: 32px; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem; text-decoration: none; transition: all 0.2s; border: none; cursor: pointer; }
.btn--primary { background: var(--icy-blue); color: var(--bg); }
.btn--primary:hover { background: var(--icy-blue-bright); transform: translateY(-2px); text-decoration: none; }
.btn--secondary { background: transparent; color: var(--icy-blue); border: 1px solid var(--border-light); }
.btn--secondary:hover { border-color: var(--icy-blue); text-decoration: none; }
.page-header { background: linear-gradient(180deg, var(--deep-blue) 0%, var(--bg) 100%); padding: 56px 0 40px; }
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-header p { color: var(--text-muted); font-size: 1.1rem; max-width: 650px; }
.breadcrumbs { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; font-size: 0.85rem; color: var(--text-dim); }
.breadcrumbs li::after { content: '\203a'; margin-left: 6px; color: var(--text-dim); }
.breadcrumbs li:last-child::after { content: ''; }
.breadcrumbs a { color: var(--text-dim); }
.breadcrumbs a:hover { color: var(--icy-blue); }
.breadcrumbs li[aria-current="page"] { color: var(--text-muted); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: border-color 0.2s, box-shadow 0.2s; }
.card:hover { border-color: var(--border-light); box-shadow: var(--shadow-glow); }
.card__icon { width: 48px; height: 48px; margin-bottom: 16px; color: var(--icy-blue); }
.card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.card p { color: var(--text-muted); font-size: 0.95rem; }
.card__link { display: inline-block; margin-top: 14px; font-weight: 600; font-size: 0.9rem; }
.article-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: border-color 0.2s, transform 0.2s; }
.article-card:hover { border-color: var(--icy-blue-dim); transform: translateY(-2px); }
.article-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.article-card h3 a { color: var(--text); text-decoration: none; }
.article-card h3 a:hover { color: var(--icy-blue); }
.article-card p { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 12px; }
.article-card__meta { font-size: 0.8rem; color: var(--text-dim); }
.table-wrap { overflow-x: auto; margin: 24px 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--border); }
th { background: var(--bg-elevated); font-weight: 600; color: var(--icy-blue); white-space: nowrap; }
tr:hover td { background: rgba(94, 200, 232, 0.03); }
.faq { max-width: 760px; margin: 0 auto; }
.faq__item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; background: var(--bg-card); }
.faq__question { width: 100%; text-align: left; background: none; border: none; padding: 18px 20px; font-size: 1rem; font-weight: 600; color: var(--text); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 12px; font-family: var(--font); }
.faq__question:hover { color: var(--icy-blue); }
.faq__icon { flex-shrink: 0; transition: transform 0.25s; color: var(--icy-blue); }
.faq__item[open] .faq__icon { transform: rotate(45deg); }
.faq__answer { padding: 0 20px 18px; color: var(--text-muted); font-size: 0.95rem; }
.article { max-width: 760px; margin: 0 auto; }
.article h2 { font-size: 1.6rem; margin: 40px 0 12px; font-weight: 700; }
.article h3 { font-size: 1.25rem; margin: 28px 0 10px; font-weight: 600; }
.article p { margin-bottom: 18px; color: var(--text); }
.article ul, .article ol { margin: 0 0 18px 22px; }
.article li { margin-bottom: 8px; }
.article blockquote { border-left: 3px solid var(--icy-blue); padding: 12px 20px; margin: 24px 0; background: var(--bg-card); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-muted); font-style: italic; }
.article__meta { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 32px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.article__related { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.article__related h3 { font-size: 1.1rem; margin-bottom: 16px; }
.article__related ul { list-style: none; margin: 0; }
.article__related li { margin-bottom: 10px; }
.callout { background: var(--deep-blue); border: 1px solid var(--border-light); border-radius: var(--radius-sm); padding: 20px 24px; margin: 24px 0; }
.callout strong { color: var(--icy-blue); }
.form { max-width: 560px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 14px; background: var(--bg); border: 1px solid var(--border-light); border-radius: var(--radius-sm); color: var(--text); font-size: 1rem; font-family: var(--font); transition: border-color 0.2s; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--icy-blue); box-shadow: 0 0 0 3px rgba(94, 200, 232, 0.15); }
.form-group textarea { min-height: 140px; resize: vertical; }
.form__message { padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 20px; font-size: 0.92rem; display: none; }
.form__message--success { background: rgba(94, 200, 232, 0.1); border: 1px solid var(--icy-blue-dim); color: var(--icy-blue-bright); }
.form__message--error { background: rgba(231, 76, 60, 0.1); border: 1px solid #e74c3c; color: #ff8a80; }
.newsletter { background: linear-gradient(135deg, var(--deep-blue), var(--deep-blue-2)); border-radius: var(--radius); padding: 48px; text-align: center; border: 1px solid var(--border-light); }
.newsletter h2 { font-size: 1.6rem; margin-bottom: 8px; }
.newsletter p { color: var(--text-muted); margin-bottom: 24px; }
.newsletter__form { display: flex; gap: 10px; max-width: 420px; margin: 0 auto; }
.newsletter__form input { flex: 1; padding: 12px 16px; background: var(--bg); border: 1px solid var(--border-light); border-radius: var(--radius-sm); color: var(--text); font-size: 1rem; }
.newsletter__form input:focus { outline: none; border-color: var(--icy-blue); }
.site-footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 56px 0 32px; margin-top: 64px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-grid h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--icy-blue); margin-bottom: 14px; }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a { color: var(--text-muted); font-size: 0.9rem; }
.footer-grid a:hover { color: var(--icy-blue); }
.footer-grid p { color: var(--text-muted); font-size: 0.9rem; }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: var(--text-dim); }
.error-page { text-align: center; padding: 120px 0; }
.error-page h1 { font-size: 3rem; color: var(--icy-blue); margin-bottom: 16px; }
.error-page p { color: var(--text-muted); margin-bottom: 28px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; } }
@media (max-width: 768px) {
  .nav__toggle { display: block; }
  .nav__links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; background: var(--bg-elevated); border-bottom: 1px solid var(--border); padding: 16px 24px; gap: 18px; align-items: flex-start; }
  .nav__links--open { display: flex; }
  .hero h1 { font-size: 2rem; }
  .hero__lead { font-size: 1.05rem; }
  .page-header h1 { font-size: 1.7rem; }
  .newsletter { padding: 32px 24px; }
  .newsletter__form { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 44px 0; }
  body { font-size: 16px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .card-grid { grid-template-columns: 1fr; }
  .btn { width: 100%; justify-content: center; }
  .hero__actions { flex-direction: column; }
}