/* =========================================================
   AI Tech Pulse — Global Stylesheet
   ========================================================= */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #10182b;
  --bg-card: #131b2e;
  --bg-elevated: #1a2438;
  --accent-cyan: #00e0ff;
  --accent-violet: #7c5cff;
  --accent-pink: #ff4fd8;
  --text-primary: #eef2ff;
  --text-secondary: #a3adc9;
  --text-muted: #6b7590;
  --border-color: rgba(124, 92, 255, 0.18);
  --success: #34e0a1;
  --gradient-main: linear-gradient(135deg, #00e0ff 0%, #7c5cff 50%, #ff4fd8 100%);
  --gradient-soft: linear-gradient(135deg, rgba(0,224,255,0.12) 0%, rgba(124,92,255,0.12) 100%);
  --shadow-glow: 0 0 40px rgba(124, 92, 255, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(0,224,255,0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(124,92,255,0.10) 0%, transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(255,79,216,0.06) 0%, transparent 45%);
  z-index: -2;
  pointer-events: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

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

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------------- Header / Nav ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1240px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #061018;
  box-shadow: var(--shadow-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 2px;
}

.nav-cta {
  background: var(--gradient-main);
  color: #061018 !important;
  padding: 10px 20px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
}
.nav-toggle span {
  width: 26px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
}

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}
.btn-primary {
  background: var(--gradient-main);
  color: #061018;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: var(--shadow-glow); }
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }

/* ---------------- Hero ---------------- */
.hero {
  padding: 90px 0 60px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-soft);
  border: 1px solid var(--border-color);
  padding: 8px 18px;
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  font-weight: 600;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  max-width: 900px;
  margin: 0 auto 20px;
}

.hero p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.hero-stats div { text-align: center; }
.hero-stats strong {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  display: block;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-stats span { color: var(--text-muted); font-size: 0.85rem; }

/* ---------------- Section headers ---------------- */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 16px;
}
.section-head h2 { font-size: 1.9rem; }
.section-head p { color: var(--text-secondary); margin-top: 6px; }
.section-tag {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.78rem;
  color: var(--accent-violet);
  font-weight: 700;
  margin-bottom: 8px;
  display: block;
}

section { padding: 60px 0; }

/* ---------------- Category filter ---------------- */
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.filter-chip {
  padding: 8px 18px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.filter-chip:hover { color: var(--text-primary); border-color: var(--accent-cyan); }
.filter-chip.active {
  background: var(--gradient-main);
  color: #061018;
  border-color: transparent;
}

/* ---------------- Article Cards ---------------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-cyan);
}

.article-card-img {
  position: relative;
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.article-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.article-card:hover .article-card-img img { transform: scale(1.07); }

.article-card-cat {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(10,14,23,0.85);
  backdrop-filter: blur(6px);
  color: var(--accent-cyan);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-card-body { padding: 22px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.article-card-body h3 { font-size: 1.15rem; line-height: 1.4; }
.article-card-body p { color: var(--text-secondary); font-size: 0.9rem; flex: 1; }

.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
}
.article-meta i { color: var(--accent-violet); margin-right: 4px; }

.featured-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 40px;
}
.featured-card .article-card-img { aspect-ratio: auto; height: 100%; min-height: 320px; }
.featured-card .article-card-body { padding: 40px; justify-content: center; }
.featured-card h3 { font-size: 1.7rem; }

/* ---------------- Ad Slots ---------------- */
.ad-slot {
  width: 100%;
  border: 1px dashed rgba(124, 92, 255, 0.35);
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(124,92,255,0.06), rgba(0,224,255,0.04));
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
  min-height: 100px;
  margin: 32px auto;
  position: relative;
  padding: 14px;
}
.ad-slot::before {
  content: attr(data-ad-label);
  position: absolute;
  top: -11px;
  left: 16px;
  background: var(--bg-primary);
  padding: 0 8px;
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--accent-cyan);
  font-weight: 700;
  letter-spacing: 1px;
}
.ad-slot-leaderboard { max-width: 970px; min-height: 90px; }
.ad-slot-incontent { max-width: 100%; min-height: 120px; }
.ad-slot-footer { max-width: 970px; min-height: 90px; }
.ad-slot-sidebar { min-height: 250px; max-width: 300px; }

/* ---------------- Newsletter ---------------- */
.newsletter {
  background: var(--gradient-soft);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.newsletter h2 { margin-bottom: 10px; font-size: 1.8rem; }
.newsletter p { color: var(--text-secondary); margin-bottom: 26px; }
.newsletter-form {
  display: flex;
  gap: 12px;
  justify-content: center;
  max-width: 480px;
  margin: 0 auto;
  flex-wrap: wrap;
}
.newsletter-form input {
  flex: 1;
  min-width: 220px;
  padding: 14px 20px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.95rem;
}
.newsletter-form input:focus { outline: none; border-color: var(--accent-cyan); }
.newsletter-msg { margin-top: 14px; font-size: 0.9rem; color: var(--success); min-height: 20px; }

/* ---------------- Footer ---------------- */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 0;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand p { color: var(--text-secondary); margin: 16px 0 20px; font-size: 0.92rem; max-width: 320px; }
.footer-col h4 { font-size: 0.95rem; margin-bottom: 18px; color: var(--text-primary); }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { color: var(--text-secondary); font-size: 0.9rem; transition: color 0.2s ease; }
.footer-col ul li a:hover { color: var(--accent-cyan); }
.social-links { display: flex; gap: 10px; }
.social-links a {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s ease;
}
.social-links a:hover { background: var(--gradient-main); color: #061018; border-color: transparent; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a:hover { color: var(--accent-cyan); }

/* ---------------- Static Pages ---------------- */
.page-hero {
  padding: 70px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}
.page-hero h1 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 12px; }
.page-hero p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

.static-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 60px 24px;
}
.static-content h2 { font-size: 1.5rem; margin: 36px 0 14px; color: var(--accent-cyan); }
.static-content h3 { font-size: 1.15rem; margin: 22px 0 10px; }
.static-content p { color: var(--text-secondary); margin-bottom: 14px; }
.static-content ul, .static-content ol { color: var(--text-secondary); margin: 0 0 14px 22px; }
.static-content ul { list-style: disc; }
.static-content ol { list-style: decimal; }
.static-content li { margin-bottom: 8px; }
.static-content strong { color: var(--text-primary); }
.last-updated { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 30px; display: block; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card, .team-card, .value-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 26px;
}
.contact-info-card { margin-bottom: 18px; }
.contact-info-card i { color: var(--accent-cyan); font-size: 1.3rem; margin-bottom: 10px; display: block; }
.contact-info-card h4 { margin-bottom: 6px; }
.contact-info-card p { color: var(--text-secondary); margin: 0; font-size: 0.9rem; }

.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.9rem; margin-bottom: 8px; color: var(--text-secondary); font-weight: 600; }
.form-group input, .form-group textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-cyan); }
.form-group textarea { resize: vertical; min-height: 130px; }
.form-msg { margin-top: 14px; font-size: 0.9rem; }
.form-msg.success { color: var(--success); }
.form-msg.error { color: #ff6b6b; }

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 30px; }
.value-card { text-align: center; }
.value-card i { font-size: 1.8rem; color: var(--accent-violet); margin-bottom: 14px; }
.value-card h4 { margin-bottom: 8px; }
.value-card p { color: var(--text-secondary); font-size: 0.88rem; margin: 0; }

/* ---------------- Article page ---------------- */
.article-hero {
  padding: 50px 0 30px;
  border-bottom: 1px solid var(--border-color);
}
.breadcrumb { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 20px; }
.breadcrumb a:hover { color: var(--accent-cyan); }
.article-hero .cat-badge {
  display: inline-block;
  background: var(--gradient-soft);
  color: var(--accent-cyan);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.article-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); max-width: 860px; margin-bottom: 18px; }
.article-hero .article-meta { border-top: none; padding-top: 0; }
.article-cover { width: 100%; max-height: 480px; object-fit: cover; border-radius: var(--radius); margin: 30px 0; }

.article-layout {
  display: grid;
  grid-template-columns: 2.3fr 1fr;
  gap: 48px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  align-items: start;
}
.article-body h2 { font-size: 1.5rem; margin: 34px 0 14px; }
.article-body h3 { font-size: 1.2rem; margin: 26px 0 12px; color: var(--accent-cyan); }
.article-body p { color: var(--text-secondary); margin-bottom: 16px; font-size: 1.02rem; }
.article-body ul, .article-body ol { color: var(--text-secondary); margin: 0 0 16px 22px; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 8px; }
.article-body blockquote {
  border-left: 3px solid var(--accent-violet);
  padding: 4px 20px;
  margin: 24px 0;
  color: var(--text-primary);
  font-style: italic;
  background: var(--bg-card);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.article-body strong { color: var(--text-primary); }

.article-tags { display: flex; gap: 10px; flex-wrap: wrap; margin: 30px 0; }
.tag-pill {
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.share-bar { display: flex; align-items: center; gap: 14px; margin: 30px 0; padding: 20px 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.share-bar span { color: var(--text-muted); font-size: 0.85rem; font-weight: 600; }
.share-bar a { width: 36px; height: 36px; border-radius: 50%; background: var(--bg-card); border: 1px solid var(--border-color); display: flex; align-items: center; justify-content: center; transition: all 0.2s ease; }
.share-bar a:hover { background: var(--gradient-main); color: #061018; border-color: transparent; }

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}
.sidebar-widget h4 { font-size: 1rem; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px solid var(--border-color); }
.mini-article { display: flex; gap: 12px; margin-bottom: 16px; }
.mini-article img { width: 70px; height: 70px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; }
.mini-article h5 { font-size: 0.88rem; line-height: 1.35; margin-bottom: 4px; }
.mini-article span { font-size: 0.75rem; color: var(--text-muted); }

.author-box { display: flex; gap: 16px; align-items: center; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 24px; margin: 30px 0; }
.author-avatar { width: 56px; height: 56px; border-radius: 50%; background: var(--gradient-main); display: flex; align-items: center; justify-content: center; font-weight: 700; color: #061018; flex-shrink: 0; }
.author-box h4 { font-size: 1rem; margin-bottom: 4px; }
.author-box p { color: var(--text-secondary); font-size: 0.85rem; margin: 0; }

/* ---------------- Loading / Empty states ---------------- */
.loader { display: flex; justify-content: center; padding: 60px 0; }
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state i { font-size: 2.4rem; margin-bottom: 16px; color: var(--accent-violet); }

/* ---------------- Pagination ---------------- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 40px; }
.pagination button {
  min-width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
}
.pagination button:hover { border-color: var(--accent-cyan); color: var(--text-primary); }
.pagination button.active { background: var(--gradient-main); color: #061018; border-color: transparent; }

/* ---------------- Back to top ---------------- */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--gradient-main);
  color: #061018;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  opacity: 0; visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease;
  z-index: 900;
  border: none;
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 992px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .featured-card { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-links { position: fixed; top: 72px; left: 0; right: 0; background: var(--bg-secondary); flex-direction: column; padding: 24px; gap: 20px; border-bottom: 1px solid var(--border-color); transform: translateY(-120%); transition: transform 0.3s ease; }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .articles-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-stats { gap: 28px; }
  .newsletter { padding: 32px 22px; }
  .section-head { flex-direction: column; align-items: flex-start; }
}