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

:root {
  --bg:        #ffffff;
  --bg-alt:    #f8f9fa;
  --border:    #e9ecef;
  --text:      #1a1a2e;
  --text-muted:#6c757d;
  --accent:    #2563eb;
  --accent-light:#eff6ff;
  --heading:   #0f172a;
  --card-shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.05);
  --radius:    12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; border-radius: var(--radius); display: block; }

/* ── Layout ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* ── Header / Nav ── */
header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 1.25rem; font-weight: 800; color: var(--heading);
  letter-spacing: -.5px;
}
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { color: var(--text-muted); font-size: .95rem; font-weight: 500; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-cta {
  background: var(--accent); color: #fff !important;
  padding: 8px 18px; border-radius: 8px; font-size: .875rem !important;
}
.nav-cta:hover { background: #1d4ed8; text-decoration: none !important; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; border: none; background: none; padding: 4px; }
.hamburger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; display: block; transition: .3s; }

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
  color: #fff; padding: 80px 0 64px; text-align: center;
}
.hero-badge {
  display: inline-block; background: rgba(37,99,235,.3); color: #93c5fd;
  padding: 6px 16px; border-radius: 100px; font-size: .8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 20px;
  border: 1px solid rgba(147,197,253,.2);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800;
  line-height: 1.15; margin-bottom: 20px; letter-spacing: -.5px;
}
.hero h1 span { color: #60a5fa; }
.hero p { font-size: 1.15rem; color: #94a3b8; max-width: 560px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: var(--accent); color: #fff;
  padding: 14px 28px; border-radius: 10px; font-weight: 600; font-size: .95rem;
  transition: background .2s;
}
.btn-primary:hover { background: #1d4ed8; text-decoration: none; color: #fff; }
.btn-secondary {
  background: rgba(255,255,255,.1); color: #fff;
  padding: 14px 28px; border-radius: 10px; font-weight: 600; font-size: .95rem;
  border: 1px solid rgba(255,255,255,.2); transition: background .2s;
}
.btn-secondary:hover { background: rgba(255,255,255,.15); text-decoration: none; color: #fff; }

/* ── Section titles ── */
.section { padding: 64px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-label {
  display: inline-block; color: var(--accent); font-size: .8rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 10px;
}
.section-title { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; color: var(--heading); margin-bottom: 12px; }
.section-sub { color: var(--text-muted); font-size: 1rem; max-width: 520px; margin: 0 auto; }

/* ── Cards grid ── */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--card-shadow); transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,.12); }

.card-img {
  width: 100%; height: 200px; object-fit: cover; border-radius: 0;
  background: linear-gradient(135deg, #1e3a5f, #2563eb);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; color: rgba(255,255,255,.3);
}
.card-body { padding: 20px; }
.card-tag {
  display: inline-block; background: var(--accent-light); color: var(--accent);
  padding: 3px 10px; border-radius: 100px; font-size: .75rem; font-weight: 600;
  margin-bottom: 10px;
}
.card-title { font-size: 1.05rem; font-weight: 700; color: var(--heading); margin-bottom: 8px; line-height: 1.4; }
.card-title a { color: inherit; }
.card-title a:hover { color: var(--accent); text-decoration: none; }
.card-excerpt { font-size: .9rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; }
.card-meta { display: flex; align-items: center; gap: 12px; font-size: .8rem; color: var(--text-muted); }
.card-meta span { display: flex; align-items: center; gap: 4px; }

/* ── Featured post ── */
.featured {
  background: var(--bg-alt); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border);
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  box-shadow: var(--card-shadow); margin-bottom: 48px;
}
.featured-img {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
  min-height: 320px; display: flex; align-items: center; justify-content: center;
  font-size: 5rem; color: rgba(255,255,255,.15);
}
.featured-body { padding: 40px; display: flex; flex-direction: column; justify-content: center; }
.featured-label {
  display: inline-block; background: #fef3c7; color: #92400e;
  padding: 4px 12px; border-radius: 100px; font-size: .75rem; font-weight: 700;
  margin-bottom: 16px; text-transform: uppercase; letter-spacing: .5px;
}
.featured-body h2 { font-size: 1.6rem; font-weight: 800; color: var(--heading); margin-bottom: 12px; line-height: 1.3; }
.featured-body p { color: var(--text-muted); margin-bottom: 24px; }
.read-more {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent); font-weight: 600; font-size: .9rem;
}
.read-more:hover { text-decoration: none; gap: 10px; }

/* ── Article content ── */
.article-hero {
  background: linear-gradient(135deg, #0f172a, #1e3a5f);
  color: #fff; padding: 64px 0 48px;
}
.article-tag {
  display: inline-block; background: rgba(37,99,235,.4); color: #93c5fd;
  padding: 4px 14px; border-radius: 100px; font-size: .8rem; font-weight: 600;
  margin-bottom: 16px;
}
.article-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; margin-bottom: 16px; line-height: 1.2; }
.article-hero .meta { color: #94a3b8; font-size: .9rem; display: flex; gap: 16px; flex-wrap: wrap; }

.article-body { padding: 56px 0; }
.article-body h2 { font-size: 1.5rem; font-weight: 700; color: var(--heading); margin: 40px 0 16px; }
.article-body h3 { font-size: 1.2rem; font-weight: 700; color: var(--heading); margin: 28px 0 12px; }
.article-body p { margin-bottom: 20px; color: var(--text); }
.article-body ul, .article-body ol { margin: 0 0 20px 24px; }
.article-body li { margin-bottom: 8px; color: var(--text); }
.article-body strong { color: var(--heading); }
.article-body blockquote {
  border-left: 4px solid var(--accent); background: var(--accent-light);
  padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 24px 0;
  font-style: italic; color: var(--text-muted);
}
.article-body .tip-box {
  background: #f0fdf4; border: 1px solid #bbf7d0; border-radius: 10px;
  padding: 20px; margin: 24px 0;
}
.article-body .tip-box strong { color: #166534; }
.article-body .warning-box {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 10px;
  padding: 20px; margin: 24px 0;
}
.toc {
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 40px;
}
.toc h4 { font-size: .9rem; font-weight: 700; color: var(--heading); margin-bottom: 12px; text-transform: uppercase; letter-spacing: .5px; }
.toc ol { margin-left: 20px; }
.toc li { margin-bottom: 6px; font-size: .9rem; }

/* ── Sidebar / Related ── */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 40px; align-items: start; }
.sidebar-card {
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 24px; position: sticky; top: 80px;
}
.sidebar-card h4 { font-size: .9rem; font-weight: 700; color: var(--heading); margin-bottom: 16px; text-transform: uppercase; letter-spacing: .5px; }
.sidebar-link { display: block; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: .9rem; color: var(--text); }
.sidebar-link:last-child { border-bottom: none; }
.sidebar-link:hover { color: var(--accent); text-decoration: none; }

/* ── Newsletter ── */
.newsletter {
  background: linear-gradient(135deg, #0f172a, #1e3a5f);
  color: #fff; border-radius: var(--radius); padding: 48px 40px;
  text-align: center; margin: 48px 0;
}
.newsletter h3 { font-size: 1.6rem; font-weight: 800; margin-bottom: 10px; }
.newsletter p { color: #94a3b8; margin-bottom: 24px; }
.newsletter-form { display: flex; gap: 12px; max-width: 440px; margin: 0 auto; }
.newsletter-form input {
  flex: 1; padding: 12px 16px; border-radius: 8px; border: none;
  font-size: .9rem; outline: none;
}
.newsletter-form button {
  background: var(--accent); color: #fff; border: none; padding: 12px 20px;
  border-radius: 8px; font-weight: 600; cursor: pointer; white-space: nowrap;
}

/* ── Footer ── */
footer {
  background: #0f172a; color: #94a3b8; padding: 56px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand .logo { color: #fff; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: .9rem; line-height: 1.7; }
.footer-col h5 { color: #fff; font-size: .875rem; font-weight: 700; margin-bottom: 16px; text-transform: uppercase; letter-spacing: .5px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #94a3b8; font-size: .9rem; }
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-bottom {
  border-top: 1px solid #1e293b; padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: gap;
  font-size: .85rem;
}
.footer-bottom a { color: #94a3b8; }
.footer-bottom a:hover { color: #fff; }

/* ── About / Static pages ── */
.page-hero {
  background: linear-gradient(135deg, #0f172a, #1e3a5f);
  color: #fff; padding: 64px 0; text-align: center;
}
.page-hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 12px; }
.page-hero p { color: #94a3b8; font-size: 1.05rem; }
.page-body { padding: 64px 0; }
.page-body h2 { font-size: 1.4rem; font-weight: 700; color: var(--heading); margin: 36px 0 14px; }
.page-body p { margin-bottom: 18px; color: var(--text); }
.page-body ul { margin: 0 0 18px 24px; }
.page-body li { margin-bottom: 8px; }

/* ── Contact form ── */
.contact-form { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: .875rem; font-weight: 600; color: var(--heading); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px;
  font-size: .95rem; font-family: inherit; background: var(--bg); color: var(--text);
  outline: none; transition: border-color .2s;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-group textarea { min-height: 140px; resize: vertical; }
.form-submit {
  background: var(--accent); color: #fff; border: none; padding: 14px 32px;
  border-radius: 8px; font-weight: 600; font-size: .95rem; cursor: pointer;
  transition: background .2s;
}
.form-submit:hover { background: #1d4ed8; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── Breadcrumb ── */
.breadcrumb { padding: 14px 0; font-size: .85rem; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 8px; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .featured { grid-template-columns: 1fr; }
  .featured-img { min-height: 200px; }
  .article-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sidebar-card { position: static; }
}
@media (max-width: 640px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero { padding: 56px 0 48px; }
  .newsletter { padding: 32px 20px; }
  .newsletter-form { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .form-grid { grid-template-columns: 1fr; }
  .featured-body { padding: 24px; }
}