:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --brand: #4f46e5;
  --brand-dark: #3730a3;
  --accent: #0ea5e9;
  --max: 1080px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.logo span { color: var(--brand); }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.95rem;
}

nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a.active { color: var(--brand); text-decoration: none; }

.hero {
  padding: 48px 0 32px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  line-height: 1.25;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 720px;
}

.disclaimer {
  margin-top: 20px;
  padding: 12px 16px;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-radius: 10px;
  color: #9a3412;
  font-size: 0.9rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  padding-bottom: 48px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.card:hover {
  border-color: #c7d2fe;
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.08);
}

.card .tag {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--brand);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.card h2 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.35;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  flex: 1;
}

.card .read-more {
  font-weight: 600;
  font-size: 0.92rem;
}

.article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px 28px;
  margin: 28px 0 48px;
}

.article h1 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
}

.article .meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.article h2 {
  margin: 28px 0 12px;
  font-size: 1.25rem;
}

.article h3 {
  margin: 20px 0 8px;
  font-size: 1.05rem;
}

.article p, .article li {
  color: #334155;
}

.article ul, .article ol {
  padding-left: 1.25rem;
}

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.92rem;
}

.article th, .article td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

.article th { background: #f1f5f9; }

.page {
  padding: 32px 0 48px;
}

.page h1 { margin-top: 0; }

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.92rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  max-width: 520px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 11px 20px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
}

.btn:hover {
  background: var(--brand-dark);
  text-decoration: none;
}

.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 36px 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.site-footer h4 {
  color: #f1f5f9;
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li { margin-bottom: 8px; }

.site-footer a { color: #cbd5e1; }

.copyright {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid #1e293b;
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .article { padding: 22px 18px; }
}