/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #1a3a5c;
  --color-accent: #e8632b;
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-text: #2d3748;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --max-width: 1100px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-header .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

.site-header .logo:hover {
  text-decoration: none;
}

.site-header .logo span {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: #fff;
  text-decoration: none;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #264d73 100%);
  color: #fff;
  padding: 4rem 0 3.5rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.15rem;
  max-width: 640px;
  margin: 0 auto;
  opacity: 0.9;
  line-height: 1.6;
}

/* Section */
.section {
  padding: 3.5rem 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.card .read-more {
  font-weight: 600;
  font-size: 0.9rem;
}

/* Article / Blog */
.article-header {
  padding: 3rem 0 1.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.article-meta {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.article-body {
  max-width: 740px;
  padding-bottom: 3rem;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 2rem 0 0.75rem;
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 1.5rem 0 0.5rem;
}

.article-body p {
  margin-bottom: 1.15rem;
}

.article-body ul,
.article-body ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body blockquote {
  border-left: 4px solid var(--color-accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: #fef3ee;
  border-radius: 0 6px 6px 0;
  color: var(--color-text);
}

/* About */
.about-content {
  max-width: 740px;
}

.about-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 2rem 0 0.75rem;
}

.about-content p {
  margin-bottom: 1.15rem;
}

/* Footer */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 0;
  margin-top: 2rem;
  font-size: 0.9rem;
  text-align: center;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.9);
}

.site-footer p {
  margin-bottom: 0.4rem;
}

/* Responsive */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero {
    padding: 2.5rem 0 2rem;
  }

  .section {
    padding: 2rem 0;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .site-header .container {
    flex-direction: column;
    text-align: center;
  }

  .site-nav {
    gap: 1rem;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }
}