/* =============================================
   TechUAF — Main Stylesheet
   Fonts: Sora (UI) + Lora (Body copy)
   ============================================= */

/* ---------- CSS Custom Properties ---------- */
:root {
  --c-bg:          #f8f9fc;
  --c-surface:     #ffffff;
  --c-border:      #e8ecf2;
  --c-primary:     #1a56db;
  --c-primary-dk:  #1344b8;
  --c-accent:      #ff6b35;
  --c-accent-lt:   #fff3ee;
  --c-text:        #1a1f36;
  --c-muted:       #6b7280;
  --c-muted-lt:    #9ca3af;
  --c-tag-bg:      #eef2ff;
  --c-tag-text:    #3730a3;

  --font-ui:       'Sora', sans-serif;
  --font-body:     'Lora', Georgia, serif;

  --radius-sm:     6px;
  --radius-md:     12px;
  --radius-lg:     20px;
  --radius-xl:     28px;

  --shadow-sm:     0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:     0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --shadow-lg:     0 12px 40px rgba(0,0,0,.10), 0 4px 12px rgba(0,0,0,.05);
  --shadow-card:   0 2px 12px rgba(26,86,219,.08);

  --transition:    all .22s cubic-bezier(.4,0,.2,1);
  --max-w:         1200px;
  --header-h:      68px;
}

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

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

body {
  font-family: var(--font-ui);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

/* ---------- Accessibility ---------- */
.skip-link {
  position: absolute; top: -60px; left: 0;
  background: var(--c-primary); color: #fff;
  padding: 8px 16px; z-index: 9999; border-radius: 0 0 var(--radius-sm) 0;
  transition: top .2s;
}
.skip-link:focus { top: 0; }

/* ---------- Layout Helpers ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 80px 0; }
.section-sm { padding: 56px 0; }

.section-header { text-align: center; margin-bottom: 52px; }
.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700; letter-spacing: -.02em; margin-bottom: 12px;
}
.section-header p { color: var(--c-muted); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* ---------- Site Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 500;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  height: var(--header-h);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h); gap: 24px;
}

/* Logo */
.site-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-ui); font-size: 1.3rem; font-weight: 600;
  letter-spacing: -.01em; white-space: nowrap;
}
.logo-icon { font-size: 1.5rem; line-height: 1; }
.logo-text { color: var(--c-text); }
.logo-text strong { color: var(--c-primary); font-weight: 800; }

/* Main nav */
.main-nav ul { display: flex; gap: 4px; align-items: center; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: .925rem; font-weight: 500; color: var(--c-muted);
  transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--c-primary); background: var(--c-tag-bg);
}

/* Header actions */
.header-actions { display: flex; align-items: center; gap: 8px; }
.btn-search {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  color: var(--c-muted); transition: var(--transition);
}
.btn-search:hover { background: var(--c-tag-bg); color: var(--c-primary); }

/* Hamburger */
.btn-menu {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 8px; border-radius: var(--radius-sm);
}
.btn-menu span {
  display: block; width: 22px; height: 2px;
  background: var(--c-text); border-radius: 2px; transition: var(--transition);
}
.btn-menu.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.btn-menu.open span:nth-child(2) { opacity: 0; }
.btn-menu.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  display: none; position: fixed; top: var(--header-h); left: 0; right: 0;
  background: var(--c-surface); border-bottom: 1px solid var(--c-border);
  z-index: 490; padding: 16px 24px 24px;
  box-shadow: var(--shadow-lg);
}
.mobile-nav.open { display: block; }
.mobile-nav ul { display: flex; flex-direction: column; gap: 4px; }
.mobile-nav a {
  display: block; padding: 11px 16px; border-radius: var(--radius-sm);
  font-weight: 500; color: var(--c-text); transition: var(--transition);
}
.mobile-nav a:hover { background: var(--c-tag-bg); color: var(--c-primary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius-sm);
  font-family: var(--font-ui); font-size: .925rem; font-weight: 600;
  cursor: pointer; border: 2px solid transparent; transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--c-primary); color: #fff; border-color: var(--c-primary);
}
.btn-primary:hover {
  background: var(--c-primary-dk); border-color: var(--c-primary-dk);
  transform: translateY(-1px); box-shadow: 0 6px 20px rgba(26,86,219,.28);
}
.btn-outline {
  background: transparent; color: var(--c-primary); border-color: var(--c-primary);
}
.btn-outline:hover {
  background: var(--c-primary); color: #fff;
  transform: translateY(-1px);
}
.btn-accent {
  background: var(--c-accent); color: #fff; border-color: var(--c-accent);
}
.btn-accent:hover {
  background: #e55a28; border-color: #e55a28;
  transform: translateY(-1px); box-shadow: 0 6px 20px rgba(255,107,53,.3);
}
.btn-sm { padding: 8px 16px; font-size: .85rem; }

/* ---------- Article Cards ---------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--c-surface); border-radius: var(--radius-md);
  border: 1px solid var(--c-border); overflow: hidden;
  transition: var(--transition);
  display: flex; flex-direction: column;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(26,86,219,.15);
}

.card-image-wrap {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
}
.card-image-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
}
.article-card:hover .card-image-wrap img { transform: scale(1.04); }
.card-icon-placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
}

.card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; gap: 10px; }

.card-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.cat-tag {
  display: inline-block;
  background: var(--c-tag-bg); color: var(--c-tag-text);
  padding: 3px 10px; border-radius: 40px;
  font-size: .75rem; font-weight: 600; letter-spacing: .01em;
}
.meta-info {
  display: flex; align-items: center; gap: 8px;
  color: var(--c-muted-lt); font-size: .78rem;
}
.meta-info span { display: flex; align-items: center; gap: 4px; }

.card-title {
  font-size: 1rem; font-weight: 700; line-height: 1.45;
  color: var(--c-text); transition: color .2s;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card:hover .card-title { color: var(--c-primary); }

.card-excerpt {
  font-family: var(--font-body); font-size: .9rem;
  color: var(--c-muted); line-height: 1.65;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

.card-link {
  margin-top: auto; padding-top: 12px;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .85rem; font-weight: 600; color: var(--c-primary);
  transition: gap .2s;
}
.card-link:hover { gap: 10px; }
.card-link svg { transition: transform .2s; }
.card-link:hover svg { transform: translateX(3px); }

/* ---------- Hero Section ---------- */
.hero {
  background: linear-gradient(150deg, #f0f4ff 0%, #fafbff 60%, #fff3ee 100%);
  padding: 100px 0 80px;
  border-bottom: 1px solid var(--c-border);
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(26,86,219,.06) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
  position: relative;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--c-accent-lt); color: var(--c-accent);
  border: 1px solid rgba(255,107,53,.2);
  padding: 6px 14px; border-radius: 40px;
  font-size: .82rem; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800; letter-spacing: -.03em; line-height: 1.18;
  margin-bottom: 20px;
}
.hero h1 span { color: var(--c-primary); }
.hero-desc {
  font-family: var(--font-body); font-size: 1.1rem;
  color: var(--c-muted); line-height: 1.75; margin-bottom: 36px;
  max-width: 480px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 32px; margin-top: 48px;
}
.hero-stat strong { display: block; font-size: 1.8rem; font-weight: 800; color: var(--c-primary); }
.hero-stat span { font-size: .8rem; color: var(--c-muted); font-weight: 500; text-transform: uppercase; letter-spacing: .06em; }

.hero-visual {
  position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.hero-card {
  background: var(--c-surface); border-radius: var(--radius-md);
  border: 1px solid var(--c-border); padding: 20px;
  box-shadow: var(--shadow-card);
  transition: transform .4s ease;
}
.hero-card:nth-child(1) { transform: translateY(-8px); }
.hero-card:nth-child(3) { transform: translateY(8px); grid-column: span 2; }
.hero-card:hover { transform: translateY(0) !important; }
.hero-card-icon { font-size: 1.8rem; margin-bottom: 10px; }
.hero-card h4 { font-size: .9rem; font-weight: 700; margin-bottom: 4px; }
.hero-card p { font-size: .78rem; color: var(--c-muted); }

/* ---------- Featured Articles ---------- */
.featured-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px;
}
.featured-main { grid-row: span 2; }
.featured-main .article-card { height: 100%; }
.featured-main .card-image-wrap { aspect-ratio: 4/3; }
.featured-main .card-title { font-size: 1.2rem; }

/* ---------- Categories Section ---------- */
.categories-section { background: var(--c-surface); }
.categories-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px;
}
.cat-card {
  background: var(--c-bg); border-radius: var(--radius-md);
  border: 1px solid var(--c-border); padding: 24px 20px;
  text-align: center; cursor: pointer; transition: var(--transition);
  text-decoration: none; display: block;
}
.cat-card:hover {
  border-color: var(--c-primary); background: var(--c-tag-bg);
  transform: translateY(-3px); box-shadow: var(--shadow-card);
}
.cat-card-icon { font-size: 2rem; margin-bottom: 10px; }
.cat-card h3 { font-size: .88rem; font-weight: 700; color: var(--c-text); margin-bottom: 4px; }
.cat-card span { font-size: .76rem; color: var(--c-muted); }

/* ---------- Newsletter ---------- */
.newsletter-section {
  background: linear-gradient(135deg, var(--c-primary) 0%, #3b82f6 100%);
  color: #fff; text-align: center;
}
.newsletter-section h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; margin-bottom: 12px; }
.newsletter-section p { opacity: .85; font-size: 1.05rem; max-width: 500px; margin: 0 auto 32px; }
.newsletter-form {
  display: flex; gap: 12px; max-width: 480px; margin: 0 auto;
}
.newsletter-form input[type="email"] {
  flex: 1; padding: 13px 18px; border-radius: var(--radius-sm);
  border: 2px solid transparent; background: rgba(255,255,255,.15);
  color: #fff; font-family: var(--font-ui); font-size: .95rem;
  outline: none; transition: var(--transition);
  backdrop-filter: blur(4px);
}
.newsletter-form input[type="email"]::placeholder { color: rgba(255,255,255,.6); }
.newsletter-form input[type="email"]:focus { border-color: rgba(255,255,255,.6); background: rgba(255,255,255,.2); }
.newsletter-form button {
  padding: 13px 24px; border-radius: var(--radius-sm);
  background: #fff; color: var(--c-primary); border: none;
  font-family: var(--font-ui); font-size: .925rem; font-weight: 700;
  cursor: pointer; transition: var(--transition); white-space: nowrap;
}
.newsletter-form button:hover { background: var(--c-accent); color: #fff; transform: translateY(-2px); }
.newsletter-note { font-size: .78rem; opacity: .65; margin-top: 14px; }
#newsletter-msg { margin-top: 16px; font-weight: 600; }

/* ---------- Blog Page ---------- */
.blog-header {
  background: linear-gradient(135deg, #f0f4ff 0%, #fafbff 100%);
  padding: 64px 0 48px; border-bottom: 1px solid var(--c-border);
}
.blog-header h1 { font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 800; letter-spacing: -.03em; margin-bottom: 10px; }
.blog-header p { color: var(--c-muted); font-size: 1.05rem; }

.blog-layout {
  display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: start;
}

.cat-filters {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 36px;
}
.cat-filter-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px; border-radius: 40px;
  border: 1.5px solid var(--c-border);
  background: var(--c-surface); color: var(--c-muted);
  font-family: var(--font-ui); font-size: .82rem; font-weight: 600;
  cursor: pointer; transition: var(--transition); text-decoration: none;
}
.cat-filter-btn:hover, .cat-filter-btn.active {
  border-color: var(--c-primary); background: var(--c-tag-bg); color: var(--c-primary);
}

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 28px; }
.sidebar-widget {
  background: var(--c-surface); border-radius: var(--radius-md);
  border: 1px solid var(--c-border); padding: 24px; overflow: hidden;
}
.sidebar-widget h3 {
  font-size: 1rem; font-weight: 700; margin-bottom: 18px;
  padding-bottom: 12px; border-bottom: 2px solid var(--c-tag-bg);
  color: var(--c-text);
}
.sidebar-cats li a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 0; border-bottom: 1px solid var(--c-border);
  font-size: .88rem; color: var(--c-muted); transition: color .2s;
}
.sidebar-cats li:last-child a { border-bottom: none; }
.sidebar-cats li a:hover { color: var(--c-primary); }
.sidebar-cats li a span.count {
  background: var(--c-tag-bg); color: var(--c-tag-text);
  padding: 2px 8px; border-radius: 40px; font-size: .72rem; font-weight: 700;
}

/* ---------- Article Page ---------- */
.article-layout {
  display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: start;
  padding: 56px 0 80px;
}
.article-content { min-width: 0; }
.breadcrumbs {
  display: flex; align-items: center; gap: 6px;
  font-size: .8rem; color: var(--c-muted); margin-bottom: 24px; flex-wrap: wrap;
}
.breadcrumbs a { color: var(--c-primary); }
.breadcrumbs span { color: var(--c-muted-lt); }

.article-header { margin-bottom: 32px; }
.article-header .cat-tag { margin-bottom: 14px; }
.article-header h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 800;
  letter-spacing: -.025em; line-height: 1.25; margin-bottom: 18px;
}
.article-meta {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  color: var(--c-muted); font-size: .85rem;
}
.article-meta span { display: flex; align-items: center; gap: 5px; }

.article-featured-img {
  width: 100%; border-radius: var(--radius-md); margin-bottom: 40px;
  aspect-ratio: 16/9; object-fit: cover;
  background: linear-gradient(135deg, #eef2ff, #e0e7ff);
}
.article-featured-placeholder {
  width: 100%; aspect-ratio: 16/9; border-radius: var(--radius-md);
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 5rem; margin-bottom: 40px;
}

.article-body {
  font-family: var(--font-body); font-size: 1.05rem;
  line-height: 1.85; color: var(--c-text);
}
.article-body h2 { font-family: var(--font-ui); font-size: 1.45rem; font-weight: 700; margin: 40px 0 16px; }
.article-body h3 { font-family: var(--font-ui); font-size: 1.15rem; font-weight: 700; margin: 28px 0 12px; }
.article-body p  { margin-bottom: 22px; }

/* Related posts */
.related-posts { margin-top: 64px; }
.related-posts h2 {
  font-size: 1.4rem; font-weight: 700; margin-bottom: 28px;
  padding-bottom: 14px; border-bottom: 2px solid var(--c-border);
}

/* ---------- Forms ---------- */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: .875rem; font-weight: 600;
  margin-bottom: 8px; color: var(--c-text);
}
.form-control {
  width: 100%; padding: 12px 16px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--c-border); background: var(--c-surface);
  font-family: var(--font-ui); font-size: .95rem; color: var(--c-text);
  transition: var(--transition); outline: none;
}
.form-control:focus { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(26,86,219,.1); }
textarea.form-control { resize: vertical; min-height: 140px; }

.form-alert {
  padding: 14px 18px; border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 500; margin-bottom: 20px;
}
.form-alert.success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.form-alert.error   { background: #fef2f2; color: #991b1b; border: 1px solid #fca5a5; }

/* ---------- Page Hero (internal pages) ---------- */
.page-hero {
  background: linear-gradient(135deg, #f0f4ff 0%, #fafbff 100%);
  padding: 64px 0 48px; border-bottom: 1px solid var(--c-border); text-align: center;
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; margin-bottom: 12px; }
.page-hero p   { color: var(--c-muted); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* ---------- About Page ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-image-block {
  background: linear-gradient(135deg, #eef2ff, #e0e7ff);
  border-radius: var(--radius-xl); padding: 60px 40px; text-align: center;
  font-size: 6rem; position: relative; overflow: hidden;
}
.values-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 48px; }
.value-card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: 20px;
}
.value-card span { font-size: 1.6rem; margin-bottom: 10px; display: block; }
.value-card h4 { font-size: .9rem; font-weight: 700; margin-bottom: 6px; }
.value-card p  { font-size: .82rem; color: var(--c-muted); }

/* ---------- Legal Pages ---------- */
.legal-content {
  max-width: 760px; margin: 0 auto; padding: 64px 0 80px;
  font-family: var(--font-body);
}
.legal-content h2 { font-family: var(--font-ui); font-size: 1.3rem; font-weight: 700; margin: 36px 0 14px; color: var(--c-text); }
.legal-content h3 { font-family: var(--font-ui); font-size: 1.05rem; font-weight: 700; margin: 24px 0 10px; }
.legal-content p  { margin-bottom: 18px; color: #374151; line-height: 1.8; }
.legal-content ul { margin: 14px 0 18px 24px; }
.legal-content ul li { list-style: disc; margin-bottom: 8px; color: #374151; line-height: 1.7; }
.legal-content a  { color: var(--c-primary); }
.legal-meta       { color: var(--c-muted); font-family: var(--font-ui); font-size: .85rem; margin-bottom: 40px; }

/* ---------- Search Page ---------- */
.search-bar-wrap {
  background: var(--c-surface); border: 1.5px solid var(--c-border);
  border-radius: var(--radius-md); display: flex; align-items: center;
  overflow: hidden; transition: var(--transition); margin-bottom: 40px;
}
.search-bar-wrap:focus-within { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(26,86,219,.1); }
.search-bar-wrap input {
  flex: 1; padding: 16px 20px; border: none; outline: none;
  font-family: var(--font-ui); font-size: 1rem; background: transparent; color: var(--c-text);
}
.search-bar-wrap button {
  padding: 14px 22px; background: var(--c-primary); color: #fff;
  border: none; cursor: pointer; font-family: var(--font-ui); font-weight: 600;
  display: flex; align-items: center; gap: 8px; transition: var(--transition);
}
.search-bar-wrap button:hover { background: var(--c-primary-dk); }
.search-results-count { color: var(--c-muted); font-size: .9rem; margin-bottom: 24px; }
.no-results { text-align: center; padding: 64px 0; color: var(--c-muted); }
.no-results span { font-size: 4rem; display: block; margin-bottom: 16px; }

/* ---------- Contact Page ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.contact-info h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 16px; }
.contact-info p  { color: var(--c-muted); font-size: 1rem; margin-bottom: 32px; line-height: 1.75; }
.contact-detail  { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 20px; }
.contact-detail-icon {
  width: 44px; height: 44px; background: var(--c-tag-bg); color: var(--c-primary);
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 1.2rem;
}
.contact-detail-text strong { display: block; font-size: .85rem; font-weight: 700; margin-bottom: 2px; }
.contact-detail-text span  { font-size: .85rem; color: var(--c-muted); }
.contact-form-card {
  background: var(--c-surface); border-radius: var(--radius-lg);
  border: 1px solid var(--c-border); padding: 36px;
  box-shadow: var(--shadow-md);
}

/* ---------- Footer ---------- */
.site-footer {
  background: #0f172a; color: #94a3b8;
  margin-top: auto;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
  padding: 64px 0 48px;
}
.footer-brand .site-logo .logo-text { color: #e2e8f0; }
.footer-brand .site-logo .logo-text strong { color: #60a5fa; }
.footer-logo .logo-icon { filter: brightness(1.2); }
.footer-brand p { font-size: .875rem; margin-top: 14px; line-height: 1.7; max-width: 280px; }
.social-links { display: flex; gap: 12px; margin-top: 24px; }
.social-links a {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,.08); color: #94a3b8;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.social-links a:hover { background: var(--c-primary); color: #fff; }

.footer-col h4 { color: #e2e8f0; font-size: .9rem; font-weight: 700; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: .85rem; color: #94a3b8; transition: color .2s; }
.footer-col a:hover { color: #60a5fa; }

.footer-bottom { border-top: 1px solid rgba(255,255,255,.07); }
.footer-bottom-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 0; gap: 16px;
}
.footer-bottom p { font-size: .8rem; }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.highlight { color: var(--c-primary); }
.badge {
  display: inline-block; padding: 3px 10px; border-radius: 40px;
  font-size: .72rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
}
.badge-new { background: #ecfdf5; color: #065f46; }
.divider { border: none; border-top: 1px solid var(--c-border); margin: 40px 0; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .blog-layout { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .featured-grid { grid-template-columns: 1fr 1fr; }
  .featured-main { grid-row: span 1; }
}
@media (max-width: 768px) {
  :root { --header-h: 62px; }
  .section { padding: 56px 0; }
  .main-nav { display: none; }
  .btn-menu { display: flex; }
  .articles-grid { grid-template-columns: 1fr; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
  .newsletter-form { flex-direction: column; }
  .featured-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .cat-filters { gap: 6px; }
}

/* ---------- Category Pages ---------- */
.cat-hero {
  background: linear-gradient(150deg, #f0f4ff 0%, #fafbff 60%, #fff3ee 100%);
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--c-border);
  position: relative; overflow: hidden;
}
.cat-hero::before {
  content: '';
  position: absolute; top: -160px; right: -160px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(26,86,219,.06) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.cat-hero-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.cat-hero-icon {
  font-size: 3rem; margin-bottom: 14px; display: inline-block;
  background: var(--c-surface); border-radius: var(--radius-md);
  padding: 12px 16px; box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
}
.cat-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800; letter-spacing: -.03em; margin-bottom: 14px; color: var(--c-text);
}
.cat-hero-desc {
  font-family: var(--font-body); font-size: 1.05rem;
  color: var(--c-muted); line-height: 1.75;
  max-width: 640px; margin-bottom: 22px;
}
.cat-hero-meta {
  display: flex; align-items: center; gap: 10px;
  font-size: .85rem; color: var(--c-muted); font-weight: 500;
}
.cat-hero-count {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--c-surface); border: 1px solid var(--c-border);
  padding: 5px 12px; border-radius: 40px; font-weight: 600; color: var(--c-primary);
}
.cat-hero-sep { color: var(--c-border); }

/* Category featured card (top article) */
.cat-featured-card { flex-direction: row; align-items: stretch; }
.cat-featured-card .cat-featured-img {
  width: 320px; flex-shrink: 0; aspect-ratio: auto; min-height: 220px;
  position: relative;
}
.cat-featured-badge {
  position: absolute; top: 14px; left: 14px;
  background: var(--c-accent); color: #fff;
  padding: 4px 12px; border-radius: 40px;
  font-size: .75rem; font-weight: 700; letter-spacing: .04em;
}
.cat-featured-card .card-title { font-size: 1.2rem !important; -webkit-line-clamp: 3 !important; }
.cat-featured-card .card-excerpt { -webkit-line-clamp: 4 !important; }

@media (max-width: 768px) {
  .cat-featured-card { flex-direction: column; }
  .cat-featured-card .cat-featured-img { width: 100%; min-height: auto; aspect-ratio: 16/9; }
}

/* ---------- Article Body Typography Enhancements ---------- */
.article-body code {
  background: #f1f5f9; color: #0f172a;
  padding: 2px 7px; border-radius: 4px;
  font-family: 'Courier New', monospace; font-size: .9em;
  border: 1px solid #e2e8f0;
}
.article-body strong { color: var(--c-text); font-weight: 700; }
.article-body em { font-style: italic; color: #4b5563; }

.article-body ul,
.article-body ol {
  margin: 0 0 22px 26px;
}
.article-body ul li { list-style: disc; margin-bottom: 9px; line-height: 1.75; }
.article-body ol li { list-style: decimal; margin-bottom: 9px; line-height: 1.75; }

/* Tip / callout boxes — applied via strong inside p */
.article-body p:has(strong:first-child) {
  background: var(--c-tag-bg);
  border-left: 4px solid var(--c-primary);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 24px;
  font-family: var(--font-ui);
  font-size: .95rem;
}

/* Table of contents / section dividers */
.article-body h2 {
  border-bottom: 2px solid var(--c-border);
  padding-bottom: 10px;
  margin-top: 48px;
}
.article-body h2:first-of-type { margin-top: 32px; }

/* =============================================
   IMAGE UPDATES — Real images with fallback
   ============================================= */

/* Card image — real img tag */
.card-image-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
  display: block;
}
.article-card:hover .card-image-wrap img { transform: scale(1.04); }

/* Fallback shown when image missing/error */
.card-image-wrap .card-icon-placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; background: linear-gradient(135deg,#eef2ff,#e0e7ff);
}

/* Article featured image */
.article-featured-figure {
  position: relative; width: 100%;
  aspect-ratio: 16/9; overflow: hidden;
  border-radius: var(--radius-md); margin-bottom: 40px;
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
}
.article-featured-img {
  width: 100%; height: 100%; object-fit: cover;
  display: block; border-radius: var(--radius-md);
}
.article-featured-fallback {
  display: none;
  position: absolute; inset: 0;
  align-items: center; justify-content: center;
  font-size: 5rem;
}

/* Category featured card image */
.cat-featured-img {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg,#eef2ff,#e0e7ff);
}
.cat-featured-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease; display: block;
}
.article-card:hover .cat-featured-img img { transform: scale(1.04); }

/* =============================================
   TABLE OF CONTENTS WIDGET
   ============================================= */
.toc-widget h3 {
  display: flex; align-items: center; gap: 8px;
  font-size: .95rem;
}
.toc-list {
  list-style: none; padding: 0; margin: 0;
  counter-reset: toc-counter;
  display: flex; flex-direction: column; gap: 2px;
}
.toc-list li {
  counter-increment: toc-counter;
  display: flex; align-items: baseline; gap: 8px;
}
.toc-list li::before {
  content: counter(toc-counter);
  font-size: .7rem; font-weight: 800;
  color: var(--c-primary); opacity: .5;
  min-width: 16px; text-align: right;
  flex-shrink: 0; line-height: 1.8;
}
.toc-link {
  display: block; padding: 7px 10px 7px 0;
  font-size: .855rem; font-weight: 500;
  color: var(--c-muted); line-height: 1.4;
  border-left: 2px solid transparent;
  padding-left: 10px; margin-left: -2px;
  transition: all .18s ease;
  text-decoration: none;
}
.toc-link:hover {
  color: var(--c-primary);
  border-left-color: rgba(26,86,219,.3);
  padding-left: 14px;
}
.toc-link.active {
  color: var(--c-primary);
  font-weight: 700;
  border-left-color: var(--c-primary);
  padding-left: 14px;
  background: linear-gradient(to right, rgba(26,86,219,.06), transparent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Reading progress bar inside TOC */
.toc-progress-wrap {
  height: 4px; background: var(--c-border);
  border-radius: 4px; margin-top: 16px; overflow: hidden;
}
.toc-progress-bar {
  height: 100%; width: 0%;
  background: linear-gradient(to right, var(--c-primary), #60a5fa);
  border-radius: 4px; transition: width .3s ease;
}
.toc-progress-label {
  font-size: .72rem; color: var(--c-muted-lt);
  text-align: right; margin-top: 5px;
}

/* Sticky TOC behaviour */
.toc-widget {
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

@media (max-width: 1024px) {
  .toc-widget { position: static; }
}

/* =============================================
   INLINE ARTICLE TABLE OF CONTENTS
   ============================================= */
.article-toc {
  background: linear-gradient(135deg, #f8faff 0%, #f0f4ff 100%);
  border: 1.5px solid rgba(26,86,219,.15);
  border-left: 4px solid var(--c-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 22px 24px 20px;
  margin: 32px 0 40px;
  font-family: var(--font-ui);
}
.article-toc-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px;
}
.article-toc-icon {
  display: flex; align-items: center; justify-content: center;
  width: 30px; height: 30px;
  background: var(--c-primary); color: #fff;
  border-radius: var(--radius-sm); flex-shrink: 0;
}
.article-toc-header > span:nth-child(2) {
  font-size: 1rem; font-weight: 700; color: var(--c-text); flex: 1;
}
.toc-toggle {
  background: none; border: none; cursor: pointer; padding: 4px;
  color: var(--c-muted); border-radius: 4px; transition: var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.toc-toggle:hover { background: rgba(26,86,219,.08); color: var(--c-primary); }
#toc-chevron { transition: transform .25s ease; }

.article-toc-list {
  list-style: none; padding: 0; margin: 0;
  counter-reset: toc;
  display: flex; flex-direction: column; gap: 0;
}
.article-toc-list.collapsed { display: none; }

.article-toc-list li {
  counter-increment: toc;
  display: flex; align-items: baseline;
  border-bottom: 1px solid rgba(26,86,219,.08);
}
.article-toc-list li:last-child { border-bottom: none; }
.article-toc-list li::before {
  content: counter(toc);
  font-size: .72rem; font-weight: 800;
  color: var(--c-primary); opacity: .45;
  min-width: 22px; text-align: center;
  flex-shrink: 0; padding-top: 11px;
}

/* TOC links inside article body */
.article-toc .toc-link {
  flex: 1;
  display: block; padding: 10px 8px 10px 4px;
  font-size: .9rem; font-weight: 500; color: var(--c-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px; margin-left: 4px;
  transition: all .18s ease; line-height: 1.4;
}
.article-toc .toc-link:hover {
  color: var(--c-primary);
  padding-left: 16px;
  border-left-color: rgba(26,86,219,.35);
}
.article-toc .toc-link.active {
  color: var(--c-primary); font-weight: 700;
  padding-left: 16px;
  border-left-color: var(--c-primary);
  background: linear-gradient(to right, rgba(26,86,219,.07), transparent);
}

/* Reading progress inside TOC */
.article-toc-progress {
  display: flex; align-items: center; gap: 10px; margin-top: 16px;
}
.article-toc-progress-bar-wrap {
  flex: 1; height: 4px; background: rgba(26,86,219,.15);
  border-radius: 4px; overflow: hidden;
}
/* reuse progress bar from sidebar — new layout */
.article-toc-progress {
  position: relative;
  height: 4px; background: rgba(26,86,219,.12);
  border-radius: 4px; overflow: visible;
  display: block; margin-top: 18px;
}
#toc-progress {
  height: 4px; width: 0%;
  background: linear-gradient(to right, var(--c-primary), #60a5fa);
  border-radius: 4px; transition: width .3s ease;
  position: absolute; top: 0; left: 0;
}
.article-toc-progress-label {
  display: block; text-align: right;
  font-size: .72rem; color: var(--c-muted-lt);
  margin-top: 6px;
}

@media (max-width: 640px) {
  .article-toc { padding: 18px 16px; }
  .article-toc .toc-link { font-size: .85rem; }
}

/* =============================================
   404 PAGE
   ============================================= */
.page-404 { padding: 80px 0; }

.error-inner {
  display: flex; gap: 64px; align-items: center;
  max-width: 860px; margin: 0 auto 80px;
}

.error-visual { text-align: center; flex-shrink: 0; }
.error-code {
  font-size: clamp(5rem, 15vw, 9rem);
  font-weight: 900; letter-spacing: -.05em;
  line-height: 1;
  background: linear-gradient(135deg, var(--c-primary) 0%, #60a5fa 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.error-icon {
  font-size: 3rem; margin-top: 8px;
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0);    }
  50%       { transform: translateY(-8px); }
}

.error-content h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800; margin-bottom: 14px; letter-spacing: -.02em;
}
.error-content p {
  color: var(--c-muted); font-family: var(--font-body);
  font-size: 1.05rem; line-height: 1.75; margin-bottom: 28px;
}

.error-search {
  display: flex; gap: 0; margin-bottom: 24px;
  border: 1.5px solid var(--c-border); border-radius: var(--radius-sm);
  overflow: hidden; transition: var(--transition);
}
.error-search:focus-within { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(26,86,219,.1); }
.error-search input {
  flex: 1; padding: 13px 18px; border: none; outline: none;
  font-family: var(--font-ui); font-size: .95rem; color: var(--c-text); background: var(--c-surface);
}
.error-search button {
  padding: 12px 20px; background: var(--c-primary); color: #fff; border: none;
  font-family: var(--font-ui); font-weight: 600; cursor: pointer;
  display: flex; align-items: center; gap: 7px; font-size: .875rem;
  transition: background .2s;
}
.error-search button:hover { background: var(--c-primary-dk); }

.error-links { display: flex; gap: 12px; flex-wrap: wrap; }

.error-suggestions h2 {
  font-size: 1.4rem; font-weight: 700; margin-bottom: 28px;
  padding-bottom: 14px; border-bottom: 2px solid var(--c-border);
}

@media (max-width: 700px) {
  .error-inner { flex-direction: column; gap: 32px; text-align: center; }
  .error-links { justify-content: center; }
  .error-search { max-width: 100%; }
}