/* =============================================
   BRIEFS ARCHIVE PAGE
   ============================================= */
.briefs-hero {
  background: var(--bg);
  padding: 140px 0 80px;
  text-align: center;
}
.briefs-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 64px);
  color: var(--primary-deep);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.briefs-hero-sub {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Search & Filter */
.briefs-controls {
  background: white;
  padding: 40px 0;
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 72px;
  z-index: 100;
}
.briefs-search-wrap {
  max-width: 600px;
  margin: 0 auto 20px;
}
.briefs-search {
  width: 100%;
  padding: 16px 20px 16px 48px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  background: var(--off-white);
  font-size: 15px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' stroke='%238896AB' stroke-width='2'%3E%3Ccircle cx='9' cy='9' r='7'/%3E%3Cpath d='M14 14l4 4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 16px center;
}
.briefs-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.briefs-filters {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}
.briefs-filter-chip {
  padding: 8px 20px;
  border-radius: 100px;
  border: 1px solid var(--border-light);
  background: white;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}
.briefs-filter-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.briefs-filter-chip--active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Brief Cards Grid */
.briefs-grid-section {
  background: var(--off-white);
  padding: 60px 0 100px;
}
.briefs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.briefs-empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  font-size: 16px;
  grid-column: 1 / -1;
}

.brief-card {
  background: white;
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 4px 24px var(--shadow-neutral);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s;
  border: 1px solid transparent;
  display: flex;
  flex-direction: column;
}
.brief-card:hover {
  border-color: var(--hairline-dark);
}
.brief-card-meta {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--text-muted);
}
.brief-card-city {
  font-weight: 600;
  color: var(--accent);
}
.brief-card-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}
.brief-card-insight {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}
.brief-card-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.brief-card-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
}
.brief-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s;
}
.brief-card-link:hover { gap: 10px; }

/* Empty State */
.briefs-empty-state {
  text-align: center;
  padding: 100px 40px;
  max-width: 600px;
  margin: 0 auto;
}
.briefs-empty-content {
  background: white;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 80px 60px;
}
.briefs-empty-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 20px;
  letter-spacing: var(--tracking-tight);
}
.briefs-empty-text {
  font-size: 15px;
  color: var(--ink-70);
  line-height: 1.8;
  margin-bottom: 40px;
}

/* Tablets (968px and below) */
@media (max-width: 968px) {
  .briefs-hero {
    padding: 120px 0 60px;
  }
  .briefs-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

/* Tablets Portrait (768px and below) */
@media (max-width: 768px) {
  .briefs-hero-title {
    font-size: clamp(28px, 6vw, 48px);
  }
  .briefs-hero-sub {
    font-size: 15px;
  }
  .briefs-controls {
    padding: 28px 0;
  }
  .briefs-search {
    padding: 14px 16px 14px 44px;
    font-size: 14px;
    background-position: 14px center;
  }
  .briefs-filters {
    gap: 6px;
  }
  .briefs-filter-chip {
    padding: 6px 16px;
    font-size: 12px;
  }
}

/* Mobile (640px and below) */
@media (max-width: 640px) {
  .briefs-hero {
    padding: 110px 0 50px;
  }
  .briefs-hero-title {
    font-size: clamp(26px, 7vw, 36px);
  }
  .briefs-hero-sub {
    font-size: 14px;
  }

  .briefs-controls {
    top: 64px;
    padding: 20px 0;
  }
  .briefs-search {
    border-radius: 8px;
  }
  .briefs-filters {
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    flex-wrap: nowrap;
  }
  .briefs-filter-chip {
    flex-shrink: 0;
  }

  .briefs-grid-section {
    padding: 40px 0 80px;
  }
  .briefs-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .brief-card {
    padding: 24px;
    border-radius: 16px;
  }
  .brief-card-meta {
    font-size: 11px;
    gap: 8px;
  }
  .brief-card-title {
    font-size: 18px;
  }
  .brief-card-insight {
    font-size: 13px;
  }
  .brief-card-tags {
    gap: 6px;
  }
  .brief-card-tag {
    font-size: 10px;
    padding: 3px 10px;
  }
  .brief-card-link {
    font-size: 13px;
  }

  .briefs-empty-content {
    padding: 60px 24px;
  }
  .briefs-empty-title {
    font-size: 22px;
  }
  .briefs-empty-text {
    font-size: 14px;
    margin-bottom: 32px;
  }
}

/* Small phones (480px and below) */
@media (max-width: 480px) {
  .briefs-hero-title {
    font-size: clamp(24px, 7vw, 30px);
  }
  .brief-card {
    padding: 20px;
  }
  .briefs-empty-content {
    padding: 48px 20px;
  }
}