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

:root {
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* HEADER */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
}

.logo-dot {
  color: var(--accent);
}

nav {
  display: flex;
  gap: 28px;
}

nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--accent);
}

/* HERO */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  color: white;
  text-align: center;
  padding: 80px 24px 64px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-bottom: 32px;
}

.search-box {
  display: flex;
  max-width: 480px;
  margin: 0 auto;
  gap: 8px;
}

.search-box input {
  flex: 1;
  padding: 12px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  outline: none;
  background: rgba(255,255,255,0.95);
  color: var(--text);
}

.search-box button {
  padding: 12px 20px;
  background: rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.4);
  color: white;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.search-box button:hover {
  background: rgba(255,255,255,0.3);
}

/* SECTIONS */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 64px 24px;
}

.section h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 36px;
  color: var(--text);
}

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 16px;
}

.card-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.card-link:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

/* FAQ */
.faq-section {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  max-width: 1100px;
  margin: 0 auto 64px;
  padding: 48px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item summary {
  padding: 18px 4px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.2s;
}

.faq-item summary:hover {
  color: var(--accent);
}

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--muted);
  font-weight: 400;
  transition: transform 0.2s;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 4px 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

/* FOOTER */
footer {
  background: #0f172a;
  color: #94a3b8;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  font-size: 1.2rem;
  font-weight: 800;
  color: white;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: white;
}

.footer-copy {
  font-size: 0.8rem;
  opacity: 0.6;
}

/* RESPONSIVE */
@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .search-box { flex-direction: column; }
  .cards { grid-template-columns: 1fr; }
  .faq-section { padding: 28px 20px; }
  nav { gap: 16px; }
}