/* ═══════════════════════════════════════════════════
   css/pages/blog.css — Tenor Analytics Blog Page
   ═══════════════════════════════════════════════════ */

/* ── CATEGORY FILTER ────────────────────────────── */
.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: var(--sp-10);
}
.blog-filter {
  padding: 7px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-3);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t-base) var(--ease);
  text-decoration: none;
}
.blog-filter:hover {
  border-color: rgba(37,99,235,0.35);
  color: var(--text-1);
  background: rgba(37,99,235,0.06);
}
.blog-filter.active {
  background: var(--grad-primary);
  border-color: transparent;
  color: #fff;
}

/* ── FEATURED POST ──────────────────────────────── */
.featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
  transition: border-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease),
              transform var(--t-base) var(--ease);
}
.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 0;
  height: 3px;
  background: var(--grad-primary);
  transition: width 0.4s var(--ease);
  z-index: 1;
}
.featured-card:hover {
  border-color: rgba(37,99,235,0.25);
  box-shadow: var(--shadow-blue);
  transform: translateY(-4px);
}
.featured-card:hover::before { width: 100%; }

.featured-visual {
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  position: relative;
  overflow: hidden;
}
.featured-visual-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--r-lg);
  background: rgba(37,99,235,0.1);
  border: 1px solid rgba(37,99,235,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue);
}
.featured-visual-icon svg { width: 40px; height: 40px; }
.featured-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(37,99,235,0.06) 0%, transparent 70%);
}

.featured-body {
  padding: var(--sp-10);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.featured-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}
.featured-body .badge {
  font-size: 0.72rem;
}
.featured-reading {
  font-size: 0.8rem;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 5px;
}
.featured-reading svg { width: 14px; height: 14px; }
.featured-title {
  font-size: clamp(1.3rem, 2.5vw, 1.6rem);
  font-weight: 800;
  color: var(--text-1);
  line-height: 1.25;
  margin-bottom: var(--sp-4);
}
.featured-excerpt {
  font-size: 0.95rem;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: var(--sp-6);
}
.featured-author {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.featured-author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 0.8rem;
  flex-shrink: 0;
}
.featured-author-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-1);
}
.featured-author-date {
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ── BLOG POST CARDS ────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
}

.blog-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease);
  text-decoration: none;
  color: inherit;
}
.blog-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 0;
  height: 3px;
  background: var(--grad-primary);
  transition: width 0.4s var(--ease);
  z-index: 1;
}
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-blue);
  border-color: rgba(37,99,235,0.25);
}
.blog-card:hover::before { width: 100%; }

/* Card preview area */
.blog-card-preview {
  height: 160px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.blog-card-preview::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(37,99,235,0.04) 0%, transparent 70%);
}
.blog-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}
.blog-card-icon svg { width: 28px; height: 28px; }
.blog-card-icon.icon-blue   { background: rgba(37,99,235,0.12); color: var(--blue);    border: 1px solid rgba(37,99,235,0.2); }
.blog-card-icon.icon-violet { background: rgba(124,58,237,0.12); color: var(--violet);  border: 1px solid rgba(124,58,237,0.2); }
.blog-card-icon.icon-cyan   { background: rgba(6,182,212,0.12); color: var(--cyan);    border: 1px solid rgba(6,182,212,0.2); }
.blog-card-icon.icon-green  { background: rgba(34,197,94,0.12); color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.blog-card-icon.icon-amber  { background: rgba(245,158,11,0.12); color: var(--warning); border: 1px solid rgba(245,158,11,0.2); }

/* Card body */
.blog-card-body {
  padding: var(--sp-5) var(--sp-5) var(--sp-6);
  display: flex;
  flex-direction: column;
  flex: 1;
}
.blog-card-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}
.blog-card-reading {
  font-size: 0.75rem;
  color: var(--text-4);
}
.blog-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.35;
  margin-bottom: var(--sp-3);
}
.blog-card-excerpt {
  font-size: 0.85rem;
  color: var(--text-3);
  line-height: 1.65;
  flex: 1;
}

/* Card footer */
.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) var(--sp-5);
  border-top: 1px solid var(--border-subtle);
  margin-top: auto;
}
.blog-card-author {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.blog-card-author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 0.6rem;
  flex-shrink: 0;
}
.blog-card-author-info {
  font-size: 0.78rem;
  color: var(--text-3);
}
.blog-card-author-info strong {
  color: var(--text-2);
  font-weight: 600;
}
.blog-card-date {
  font-size: 0.78rem;
  color: var(--text-4);
}

/* ── NEWSLETTER CTA ─────────────────────────────── */
.newsletter-card {
  grid-column: 1 / -1;
  background: var(--grad-primary);
  border: none;
  border-radius: var(--r-lg);
  padding: var(--sp-12) var(--sp-10);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.newsletter-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.newsletter-card::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.newsletter-inner {
  position: relative;
  z-index: 1;
  max-width: 520px;
  margin: 0 auto;
}
.newsletter-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--sp-5);
  color: #fff;
}
.newsletter-icon svg { width: 24px; height: 24px; }
.newsletter-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: var(--sp-3);
}
.newsletter-desc {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.65;
  margin-bottom: var(--sp-6);
}
.newsletter-form {
  display: flex;
  gap: 10px;
  max-width: 440px;
  margin: 0 auto;
}
.newsletter-input {
  flex: 1;
  padding: 12px 18px;
  border-radius: var(--r);
  border: 1.5px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.12);
  color: #fff;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--t-fast);
}
.newsletter-input::placeholder { color: rgba(255,255,255,0.55); }
.newsletter-input:focus { border-color: #fff; }
.newsletter-btn {
  padding: 12px 24px;
  border-radius: var(--r);
  border: none;
  background: #fff;
  color: var(--blue);
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t-base) var(--ease);
}
.newsletter-btn:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  transform: translateY(-1px);
}

/* ── EMPTY STATE ────────────────────────────────── */
.blog-empty {
  text-align: center;
  padding: var(--sp-16) var(--sp-6);
  color: var(--text-3);
}
.blog-empty-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(37,99,235,0.08);
  border: 1px solid rgba(37,99,235,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--sp-5);
  color: var(--blue);
}
.blog-empty-icon svg { width: 28px; height: 28px; }
.blog-empty h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: var(--sp-2);
}
.blog-empty p {
  font-size: 0.9rem;
  color: var(--text-3);
}

/* ── RESPONSIVE ─────────────────────────────────── */
@media (max-width: 960px) {
  .featured-card {
    grid-template-columns: 1fr;
  }
  .featured-visual {
    min-height: 200px;
  }
  .featured-body {
    padding: var(--sp-8);
  }
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .featured-body {
    padding: var(--sp-6);
  }
  .featured-title {
    font-size: 1.2rem;
  }
  .newsletter-form {
    flex-direction: column;
  }
  .newsletter-card {
    padding: var(--sp-8) var(--sp-6);
  }
}