/* IA Hub — Premium Editorial Dark Theme */
:root {
  --ia-bg: #030b1d;
  --ia-panel: #081833;
  --ia-panel-2: #0c2144;
  --ia-line: #1a3059;
  --ia-text: #e9f1ff;
  --ia-muted: #8ea8cc;
  --ia-accent: #5a4fff;
  --ia-accent-2: #3678ff;
  --ia-gradient: linear-gradient(135deg, #5a4fff, #3678ff);
  --ia-shadow: 0 22px 48px rgba(0,0,0,.34);
  --ia-font-body: "Manrope", "Segoe UI", sans-serif;
  --ia-font-title: "Sora", "Trebuchet MS", sans-serif;
  --ia-radius: 14px;
  --ia-nav-h: 60px;
  --ia-pill-h: 50px;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--ia-nav-h) + var(--ia-pill-h) + 24px); }

body.ia-hub {
  min-height: 100vh;
  background: var(--ia-bg);
  color: var(--ia-text);
  font-family: var(--ia-font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.ia-container {
  width: min(1140px, 100%);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== NAV ===== */
.ia-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--ia-nav-h);
  background: rgba(3, 11, 29, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(26, 48, 89, 0.4);
  transition: background 0.3s, border-color 0.3s;
}
.ia-nav.is-scrolled {
  background: rgba(3, 11, 29, 0.92);
  border-bottom-color: var(--ia-line);
}
.ia-nav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 100%;
  width: min(1140px, 100%);
  margin: 0 auto;
  padding: 0 20px;
}
.ia-nav-logo {
  font-family: var(--ia-font-title);
  font-size: 22px;
  font-weight: 800;
  color: var(--ia-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.ia-nav-links {
  display: flex;
  gap: 24px;
  margin-left: auto;
}
.ia-nav-links a {
  color: var(--ia-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.2s;
}
.ia-nav-links a:hover { color: var(--ia-text); }

/* ===== BUTTONS ===== */
.ia-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-family: var(--ia-font-body);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  white-space: nowrap;
}
.ia-btn:hover { transform: translateY(-1px); }
.ia-btn:active { transform: translateY(0); }

.ia-btn-primary {
  background: var(--ia-gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(90, 79, 255, 0.3);
}
.ia-btn-primary:hover { box-shadow: 0 6px 28px rgba(90, 79, 255, 0.45); }

.ia-btn-ghost {
  background: transparent;
  color: var(--ia-muted);
  border: 1px solid var(--ia-line);
}
.ia-btn-ghost:hover { border-color: var(--ia-accent); color: var(--ia-text); }

.ia-btn-outline {
  background: transparent;
  color: var(--ia-accent-2);
  border: 1px solid rgba(54, 120, 255, 0.3);
}
.ia-btn-outline:hover { background: rgba(54, 120, 255, 0.08); border-color: var(--ia-accent-2); }

.ia-btn-sm { padding: 8px 18px; font-size: 13px; border-radius: 8px; }
.ia-btn-block { width: 100%; }

/* ===== HERO ===== */
.ia-hero {
  position: relative;
  padding: 120px 0 64px;
  overflow: hidden;
}
.ia-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(800px 400px at 20% 10%, rgba(90, 79, 255, 0.15), transparent 60%),
    radial-gradient(600px 350px at 80% 20%, rgba(54, 120, 255, 0.1), transparent 55%);
  pointer-events: none;
}
.ia-hero .ia-container { position: relative; z-index: 1; }

.ia-eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ia-accent-2);
  margin-bottom: 16px;
}
.ia-title {
  margin: 0;
  font-family: var(--ia-font-title);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  max-width: 18ch;
}
.ia-lead {
  margin: 16px 0 0;
  color: var(--ia-muted);
  font-size: 18px;
  max-width: 60ch;
  line-height: 1.7;
}

/* Hero stats */
.ia-hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 32px;
}
.ia-hero-stat { text-align: center; }
.ia-hero-stat-val {
  display: block;
  font-family: var(--ia-font-title);
  font-size: 28px;
  font-weight: 800;
  color: var(--ia-text);
}
.ia-hero-stat-label {
  display: block;
  font-size: 13px;
  color: var(--ia-muted);
  margin-top: 2px;
}
.ia-hero-stat-sep {
  width: 1px;
  height: 36px;
  background: var(--ia-line);
}

/* Search */
.ia-search-wrap {
  position: relative;
  margin-top: 32px;
  max-width: 480px;
}
.ia-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--ia-muted);
  pointer-events: none;
}
.ia-search-input {
  width: 100%;
  padding: 14px 16px 14px 44px;
  border: 1px solid var(--ia-line);
  border-radius: 12px;
  background: rgba(8, 24, 51, 0.8);
  color: var(--ia-text);
  font-family: var(--ia-font-body);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.ia-search-input::placeholder { color: rgba(142, 168, 204, 0.6); }
.ia-search-input:focus {
  border-color: var(--ia-accent);
  box-shadow: 0 0 0 3px rgba(90, 79, 255, 0.15);
}

/* Search results overlay */
.ia-search-results {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  max-height: 400px;
  overflow-y: auto;
  background: rgba(8, 24, 51, 0.96);
  border: 1px solid var(--ia-line);
  border-radius: 12px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 50;
  padding: 8px;
}
.ia-search-results.is-open { display: block; }
.ia-search-result {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--ia-text);
  transition: background 0.15s;
}
.ia-search-result:hover { background: rgba(90, 79, 255, 0.1); }
.ia-search-result-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
}
.ia-search-result-topic {
  font-size: 11px;
  color: var(--ia-muted);
  margin-top: 2px;
}
.ia-search-no-results {
  padding: 16px;
  text-align: center;
  color: var(--ia-muted);
  font-size: 14px;
}

/* Hero CTAs */
.ia-hero-ctas {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* ===== CATEGORY PILLS ===== */
.ia-categories-bar {
  position: sticky;
  top: var(--ia-nav-h);
  z-index: 90;
  background: rgba(3, 11, 29, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(26, 48, 89, 0.3);
  padding: 0;
}
.ia-categories-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  width: min(1140px, 100%);
  margin: 0 auto;
  padding: 10px 20px;
}
.ia-categories-scroll::-webkit-scrollbar { display: none; }

.ia-pill {
  flex-shrink: 0;
  padding: 8px 18px;
  border: 1px solid var(--ia-line);
  border-radius: 999px;
  background: transparent;
  color: var(--ia-muted);
  font-family: var(--ia-font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.ia-pill:hover { border-color: var(--ia-accent); color: var(--ia-text); }
.ia-pill.is-active {
  background: var(--ia-gradient);
  border-color: transparent;
  color: #fff;
}

/* ===== SECTIONS ===== */
.ia-section {
  padding-top: 48px;
}
.ia-section-title {
  margin: 0 0 8px;
  font-family: var(--ia-font-title);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.ia-section-desc {
  margin: 0 0 24px;
  color: var(--ia-muted);
  font-size: 15px;
  max-width: 65ch;
}

/* ===== GRIDS ===== */
.ia-featured-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 16px;
}
.ia-featured-grid .ia-card.is-featured {
  grid-row: 1 / 3;
}

.ia-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* ===== CARDS ===== */
.ia-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--ia-line);
  border-radius: var(--ia-radius);
  background: linear-gradient(170deg, rgba(9, 31, 67, 0.7), rgba(7, 18, 40, 0.85));
  overflow: hidden;
  transform: translateY(8px);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease, border-color 0.25s, box-shadow 0.25s;
}
.ia-card.is-visible { transform: translateY(0); opacity: 1; }
.ia-card:hover {
  border-color: rgba(90, 79, 255, 0.5);
  box-shadow: 0 8px 32px rgba(90, 79, 255, 0.12);
}

.ia-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--ia-panel);
  border-bottom: 1px solid rgba(26, 48, 89, 0.3);
  flex-shrink: 0;
}
.ia-card-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ia-card-title {
  margin: 0;
  font-family: var(--ia-font-title);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.ia-card.is-featured .ia-card-title {
  font-size: 20px;
  -webkit-line-clamp: 3;
}
.ia-card-desc {
  margin: 0;
  color: var(--ia-muted);
  font-size: 13px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.ia-card.is-featured .ia-card-desc {
  -webkit-line-clamp: 3;
}
.ia-card-meta {
  padding: 0 16px 14px;
  margin-top: auto;
}
.ia-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(90, 79, 255, 0.1);
  color: var(--ia-accent-2);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ===== LOAD MORE ===== */
.ia-load-more-wrap {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

/* ===== CTA BANNERS ===== */
.ia-cta-banner {
  margin-top: 48px;
  border-radius: var(--ia-radius);
  background: var(--ia-gradient);
  position: relative;
  overflow: hidden;
}
.ia-cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.08), transparent 60%);
  pointer-events: none;
}
.ia-cta-banner-alt { background: linear-gradient(135deg, #3678ff, #1a1a5c); }
.ia-cta-banner-inner {
  position: relative;
  z-index: 1;
  padding: 48px 40px;
  text-align: center;
}
.ia-cta-banner-title {
  margin: 0 0 8px;
  font-family: var(--ia-font-title);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  color: #fff;
}
.ia-cta-banner-desc {
  margin: 0 0 24px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 16px;
}
.ia-cta-banner .ia-btn-primary {
  background: #fff;
  color: var(--ia-accent);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.ia-cta-banner .ia-btn-primary:hover { box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25); }

/* ===== FOOTER ===== */
.ia-footer {
  margin-top: 80px;
  border-top: 1px solid var(--ia-line);
  padding: 48px 0 32px;
}
.ia-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}
.ia-footer-logo {
  font-family: var(--ia-font-title);
  font-size: 22px;
  font-weight: 800;
  color: var(--ia-text);
}
.ia-footer-tagline {
  margin: 8px 0 0;
  color: var(--ia-muted);
  font-size: 14px;
}
.ia-footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ia-footer-links a {
  color: var(--ia-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.ia-footer-links a:hover { color: var(--ia-text); }
.ia-footer-copy {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid rgba(26, 48, 89, 0.4);
  color: rgba(142, 168, 204, 0.5);
  font-size: 13px;
  text-align: center;
}

/* ===== MOBILE STICKY CTA ===== */
.ia-mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 80;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
  background: rgba(3, 11, 29, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--ia-line);
  transform: translateY(100%);
  transition: transform 0.3s ease;
}
.ia-mobile-cta.is-visible { transform: translateY(0); }

.ia-empty {
  color: var(--ia-muted);
  font-size: 14px;
  grid-column: 1 / -1;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .ia-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .ia-hero { padding: 100px 0 48px; }
  .ia-title { max-width: none; }
  .ia-lead { font-size: 16px; }

  .ia-hero-stats { gap: 16px; }
  .ia-hero-stat-val { font-size: 22px; }

  .ia-featured-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
  .ia-featured-grid .ia-card.is-featured { grid-row: auto; }

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

  .ia-nav-links { display: none; }

  .ia-footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .ia-cta-banner-inner { padding: 32px 20px; }

  .ia-mobile-cta { display: block; }

  body.ia-hub { padding-bottom: 72px; }
}

@media (max-width: 480px) {
  .ia-hero { padding: 90px 0 36px; }
  .ia-hero-ctas { flex-direction: column; }
  .ia-hero-ctas .ia-btn { width: 100%; }
  .ia-search-wrap { max-width: 100%; }
}