/* ============================================================
   AI Atlas — Guide Archive (Document Card Listing)
   ============================================================ */

/* ─── HEADER ─────────────────────────────────────────── */

.guide-archive-header {
  position: relative;
  overflow: hidden;
  padding: 120px 0 70px 0;
  text-align: center;
}

.guide-archive-header-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, #e9e6ed 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 90% 80%, rgba(6,182,212,0.1) 0%, transparent 60%);
  pointer-events: none;
}

.guide-archive-header-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.guide-archive-header-inner h1 {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.035em;
  max-width: 640px;
  margin-top: 4px;
}

.guide-archive-header-inner p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  line-height: 1.7;
  margin-top: 4px;
}

/* ─── MAIN LAYOUT ────────────────────────────────────── */

.guide-archive-main {
  padding-top: 20px;
  padding-bottom: 60px;
}

.guide-archive-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 80px 0;
  font-size: 1rem;
}

/* ─── DOCUMENT GRID ──────────────────────────────────── */

.guide-doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* ─── DOCUMENT CARD ──────────────────────────────────── */

.guide-doc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;

  /* Paper-like shadow */
  box-shadow:
    0 1px 2px rgba(0,0,0,0.06),
    0 4px 12px rgba(0,0,0,0.07),
    0 0 0 0 transparent;
}

/* Top accent bar — the "official document" stripe */
.guide-doc-card::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--accent-light) 100%);
  flex-shrink: 0;
}

.guide-doc-card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 2px 4px rgba(0,0,0,0.07),
    0 12px 32px rgba(0,0,0,0.11),
    0 0 0 1px rgba(6,182,212,0.2);
  border-color: rgba(6,182,212,0.35);
}

/* ── Card top row: icon + document type label ───────── */

.guide-doc-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 28px 0;
}

.guide-doc-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6,182,212,0.1);
  border: 1px solid rgba(6,182,212,0.25);
  border-radius: 8px;
  color: var(--brand);
  flex-shrink: 0;
}

.guide-doc-type {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
}

/* ── Body: title + excerpt ──────────────────────────── */

.guide-doc-body {
  padding: 16px 28px 20px;
  flex: 1;
}

.guide-doc-title {
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 10px;
}

.guide-doc-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ── Meta row: chapters · read time · level ─────────── */

.guide-doc-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding: 14px 28px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.02);
}

.guide-doc-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--text-dim);
  white-space: nowrap;
}

.guide-doc-meta-item svg {
  opacity: 0.6;
  flex-shrink: 0;
}

/* ── Footer: date + CTA ─────────────────────────────── */

.guide-doc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  gap: 12px;
}

.guide-doc-updated {
  font-size: 0.77rem;
  color: var(--text-dim);
  font-weight: 500;
}

.guide-doc-cta {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--brand);
  white-space: nowrap;
  transition: color 0.2s;
}

.guide-doc-card:hover .guide-doc-cta {
  color: var(--brand-dark);
}

/* ─── RESPONSIVE ─────────────────────────────────────── */

@media (max-width: 768px) {
  .guide-archive-header {
    padding: 50px 0;
  }

  .guide-doc-grid {
    grid-template-columns: 1fr;
  }

  .guide-doc-top,
  .guide-doc-body,
  .guide-doc-meta,
  .guide-doc-footer {
    padding-left: 20px;
    padding-right: 20px;
  }
}