:root {
  --bg: #f5f6f8;
  --ink: #1f2937;
  --soft: #6b7280;
  --brand: #334155;
  --brand-2: #475569;
  --card: #ffffff;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.hero {
  background: linear-gradient(120deg, #111827, #1f2937 65%, #374151);
  color: #fff;
  padding-bottom: 3rem;
}

.top-nav {
  width: min(1100px, 92%);
  margin: 0 auto;
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.4px;
}

.hero-content {
  padding: 3rem 0;
  text-align: center;
}

.tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  margin: 0 0 0.7rem;
  font-size: 0.9rem;
}

h1 {
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.15;
  margin: 0.2rem 0 0.8rem;
}

h2 {
  margin-top: 0;
  font-size: 1.6rem;
}

h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

p {
  margin: 0.5rem 0 1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.1rem;
  justify-content: center;
}

.btn {
  display: inline-block;
  text-decoration: none;
  background: #fff;
  color: #0f172a;
  padding: 0.7rem 1.1rem;
  border-radius: 10px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-sm {
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
}

main {
  padding: 2rem 0 3rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.4rem;
  margin-bottom: 1rem;
  box-shadow: 0 6px 16px rgba(17, 24, 39, 0.06);
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid.three {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.mini-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  background: #f9fafb;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1rem 0;
  justify-content: center;
}

.notice {
  border-left: 4px solid var(--brand-2);
  background: #f3f4f6;
  padding: 0.9rem;
  border-radius: 8px;
}

.image-card {
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
}

.image-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  background: #e5e7eb;
}

.image-card figcaption {
  padding: 0.8rem;
  color: var(--soft);
  font-size: 0.95rem;
}

.link-list {
  display: grid;
  gap: 0.7rem;
}

.link-list a {
  text-decoration: none;
  border: 1px solid var(--border);
  background: #f9fafb;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  color: #1f2937;
  font-weight: 600;
}

.link-list a:hover {
  background: #f3f4f6;
}

.footer {
  text-align: center;
  color: var(--soft);
  padding: 0.8rem;
}

.simple-header {
  background: #111827;
  color: #fff;
  padding: 2rem 0;
}

.simple-header h1 {
  margin: 0;
  font-size: clamp(1.7rem, 5vw, 2.5rem);
}

.simple-header p {
  margin-bottom: 0;
  color: #dbe7ff;
}

.back-link {
  display: inline-block;
  margin-top: 1rem;
  color: #d1d5db;
  text-decoration: none;
  font-weight: 600;
}

.prose {
  max-width: 860px;
  margin: 0 auto;
}

.prose h2 {
  margin-top: 1.4rem;
  margin-bottom: 0.4rem;
}

.prose h3 {
  margin-top: 1rem;
  margin-bottom: 0.2rem;
}

.prose ul {
  padding-left: 1.1rem;
}

.meta {
  color: var(--soft);
  font-size: 0.95rem;
}

.center-block {
  text-align: center;
}

.top-nav .btn-sm {
  background: #f9fafb;
}

@media (max-width: 640px) {
  .hero-content {
    padding-top: 2rem;
  }

  .card {
    padding: 1rem;
  }
}