/* ==========================================================
   5G Network Architecture — Homepage design tokens & layout
   ========================================================== */
:root {
  --signal-navy: #0a1128;
  --signal-navy-deep: #050810;
  --signal-panel: #101a30;
  --signal-cyan: #00d9ff;
  --signal-amber: #ffb020;
  --signal-violet: #a855f7;
  --fog: #8993a8;
  --paper: #eef2f8;
  --border-soft: rgba(255,255,255,0.08);
}

.fgna-home {
  background: var(--signal-navy);
  color: var(--paper);
  font-family: 'Inter', sans-serif;
  overflow-x: hidden;
}

.fgna-eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--signal-cyan);
  margin-bottom: 18px;
}

.fgna-home h1, .fgna-home h2, .fgna-home h3 {
  font-family: 'Space Grotesk', sans-serif;
  color: var(--paper);
  line-height: 1.15;
  margin: 0 0 16px;
}

/* ---------------- HERO ---------------- */
.fgna-hero {
  padding: 90px 6vw 40px;
  background:
    radial-gradient(circle at 85% 20%, rgba(0,217,255,0.10), transparent 55%),
    radial-gradient(circle at 10% 90%, rgba(168,85,247,0.08), transparent 50%),
    var(--signal-navy-deep);
}
.fgna-hero-inner {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 50px;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
}
.fgna-hero h1 { font-size: clamp(2.1rem, 3.6vw, 3.1rem); font-weight: 700; }
.fgna-hero-sub { color: var(--fog); font-size: 1.05rem; max-width: 46ch; margin-bottom: 28px; }

.fgna-hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 42px; }
.fgna-btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.fgna-btn:hover { transform: translateY(-2px); }
.fgna-btn-primary {
  background: linear-gradient(135deg, var(--signal-amber), #ff8a00);
  color: #1a0f00;
}
.fgna-btn-ghost {
  border: 1px solid var(--border-soft);
  color: var(--paper);
}
.fgna-btn-ghost:hover { border-color: var(--signal-cyan); color: var(--signal-cyan); }

.fgna-hero-stats { display: flex; gap: 36px; }
.fgna-hero-stats > div { display: flex; flex-direction: column; }
.fgna-stat-num { font-family: 'Space Grotesk', sans-serif; font-size: 1.7rem; font-weight: 700; color: var(--signal-cyan); }
.fgna-stat-label { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; color: var(--fog); letter-spacing: 0.04em; }

.fgna-hero-diagram { width: 100%; }
.fgna-hero-diagram svg { width: 100%; height: auto; display: block; }

.fgna-diagram-caption {
  max-width: 1280px;
  margin: 18px auto 0;
  padding: 0 6vw;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--fog);
}

/* ---------------- SECTION TITLE ---------------- */
.fgna-section-title {
  font-size: 1.6rem;
  max-width: 1280px;
  margin: 0 auto 30px;
  padding: 0 6vw;
}

/* ---------------- TOPICS ---------------- */
.fgna-topics { padding: 80px 0 40px; }
.fgna-topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 6vw;
}
.fgna-topic-card {
  background: var(--signal-panel);
  border: 1px solid var(--border-soft);
  border-radius: 14px;
  padding: 26px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.fgna-topic-card:hover { border-color: var(--signal-cyan); transform: translateY(-3px); }
.fgna-topic-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--signal-violet);
  background: rgba(168,85,247,0.12);
  padding: 3px 9px;
  border-radius: 5px;
  margin-bottom: 14px;
}
.fgna-topic-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.fgna-topic-card p { color: var(--fog); font-size: 0.92rem; margin: 0; }

/* ---------------- COURSE PROMO ---------------- */
.fgna-course-promo { padding: 20px 6vw 90px; }
.fgna-course-promo-inner {
  max-width: 1280px;
  margin: 0 auto;
  background: linear-gradient(120deg, rgba(0,217,255,0.08), rgba(168,85,247,0.08));
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: 54px 50px;
}
.fgna-course-promo-inner p { color: var(--fog); max-width: 55ch; margin-bottom: 26px; }

/* ---------------- LATEST POSTS ---------------- */
.fgna-latest { padding: 20px 0 100px; }
.fgna-latest-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 6vw;
}
.fgna-post-card {
  display: block;
  background: var(--signal-panel);
  border: 1px solid var(--border-soft);
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.fgna-post-card:hover { transform: translateY(-4px); border-color: var(--signal-cyan); }
.fgna-post-thumb img { width: 100%; height: 170px; object-fit: cover; display: block; }
.fgna-post-body { padding: 20px; }
.fgna-post-date { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; color: var(--signal-cyan); }
.fgna-post-body h3 { font-size: 1.05rem; margin: 8px 0; }
.fgna-post-body p { color: var(--fog); font-size: 0.88rem; margin: 0; }

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 900px) {
  .fgna-hero-inner { grid-template-columns: 1fr; }
  .fgna-topics-grid, .fgna-latest-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .fgna-topics-grid, .fgna-latest-grid { grid-template-columns: 1fr; }
  .fgna-hero-stats { flex-wrap: wrap; gap: 22px; }
  .fgna-course-promo-inner { padding: 36px 24px; }
}