/* ---------- COLOR THEME (สดใสขึ้น) ---------- */
:root {
  --kb-bg: #f9fafb;           /* พื้นหลังสว่าง */
  --kb-card: #ffffff;         /* การ์ดขาว */
  --kb-text: #1f2937;         /* ข้อความหลัก เทาเข้ม */
  --kb-sub: #6b7280;          /* ข้อความรอง เทา */
  --kb-border: #e5e7eb;       /* เส้นขอบอ่อน */
  --kb-primary: #3b82f6;      /* ฟ้า modern */
  --kb-chip: #f3f4f6;         /* ชิปเทาอ่อน */
  --kb-chip-text: #374151;    /* ตัวหนังสือชิป */
  --kb-muted: #6b7280;        /* muted text */
  --kb-hover: #f0f9ff;        /* hover อ่อน */
  --kb-accent: #10b981;       /* accent เขียว mint */
}
* { box-sizing: border-box; }
body {
  background: var(--kb-bg);
  color: var(--kb-text);
  font-family: "Inter", "Sarabun", sans-serif;
  line-height: 1.6;
}

/* ---------- HERO ---------- */
.kb-hero {
  padding: 48px 16px 24px;
  background: linear-gradient(135deg, #e0f2fe, #f0fdf4);
  border-bottom: 1px solid var(--kb-border);
}
.kb-hero__inner { max-width: 1100px; margin: 0 auto; text-align: center; }
.kb-hero h1 {
  margin: 0 0 12px;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--kb-text);
}
.kb-hero__subtitle {
  margin: 0 auto;
  max-width: 700px;
  color: var(--kb-sub);
  font-size: 1.1rem;
}

/* ---------- CONTROL BAR (ปรับความยาวช่องค้นหา) ---------- */
:root { --ctl-h: 44px; }

.kb-controls{
  /* จัดให้อยู่กลางหน้า + จำกัดความกว้างรวม */
  max-width: 1100px;
  margin: 24px auto 0;
  padding: 0 16px;

  display: grid;
  /* ให้ช่องค้นหา “ยาว” แต่ไม่เกิน 720px */
  grid-template-columns: minmax(320px, 720px) auto;
  gap: 16px;
  align-items: center;
}

/* ช่องค้นหา */
.kb-search{ width: 100%; display:flex; align-items:center; }
.kb-search input{
  width: 100%;
  height: var(--ctl-h);
  line-height: var(--ctl-h);
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid var(--kb-border);
  background: #fff;
  color: var(--kb-text);
  outline: none;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.kb-search input:focus{
  border-color: var(--kb-primary);
  box-shadow: 0 0 0 3px rgba(59,130,246,.2);
}
.kb-search input::placeholder{ color:#9ca3af; }

/* จัดเรียง */
.kb-sort{ display:flex; align-items:center; gap:8px; }
.kb-sort label{
  margin:0;
  white-space:nowrap;
  color: var(--kb-sub);
  font-size: .92rem;
}
.kb-sort select{
  height: var(--ctl-h);
  line-height: var(--ctl-h);
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--kb-border);
  background: #fff;
  color: var(--kb-text);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

/* มือถือ: ให้เรียงเป็น 1 คอลัมน์ และปุ่มจัดเรียงไปขวา */
@media (max-width: 640px){
  .kb-controls{ grid-template-columns: 1fr; }
  .kb-sort{ justify-content: flex-end; }
}

/* ---------- TAGS ---------- */
.kb-tags {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.kb-tag {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--kb-border);
  background: var(--kb-chip);
  color: var(--kb-chip-text);
  cursor: pointer;
  font-size: .9rem;
  transition: all .2s ease;
}
.kb-tag:hover { background: #e5e7eb; }
.kb-tag.is-active {
  background: var(--kb-primary);
  color: #fff;
  border-color: var(--kb-primary);
  font-weight: 600;
}

/* ---------- GRID + CARD ---------- */
.kb-grid {
  max-width: 1100px;
  margin: 24px auto 40px;
  padding: 0 16px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}
.kb-card {
  grid-column: span 12;
  display: flex;
  flex-direction: column;
  background: var(--kb-card);
  border: 1px solid var(--kb-border);
  border-radius: 16px;
  overflow: hidden;
  transition: transform .1s ease, box-shadow .2s ease;
}
.kb-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(0,0,0,.08);
}
.kb-card__image-wrap {
  display: block;
  aspect-ratio: 16/9;
  background: #f3f4f6;
}
.kb-card__image-wrap img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.kb-card__body { padding: 16px; }
.kb-card__title {
  margin: 0 0 8px;
  font-size: 1.15rem;
  font-weight: 600;
}
.kb-card__title a { color: var(--kb-text); text-decoration: none; }
.kb-card__title a:hover { color: var(--kb-primary); }
.kb-card__meta {
  color: var(--kb-sub);
  font-size: .85rem;
  margin-bottom: 8px;
}
.kb-card__excerpt {
  color: #374151;
  margin: 0 0 12px;
  font-size: .95rem;
}
.kb-card__tags { display: flex; gap: 6px; flex-wrap: wrap; }
.kb-chip {
  border: 1px solid var(--kb-border);
  background: #f9fafb;
  color: var(--kb-sub);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: .8rem;
}

/* ---------- PAGINATION ---------- */
.kb-pagination {
  max-width: 1100px;
  margin: 20px auto 40px;
  padding: 0 16px;
  display: flex; gap: 10px; align-items: center; justify-content: center;
}
.kb-page {
  padding: 8px 14px;
  border: 1px solid var(--kb-border);
  border-radius: 10px;
  background: #fff;
  color: var(--kb-text);
  text-decoration: none;
  transition: background .2s;
}
.kb-page:hover { background: var(--kb-hover); }
.kb-page.is-current { font-weight: 700; border-color: var(--kb-primary); background: var(--kb-primary); color: #fff; }
.kb-page.is-disabled { opacity: .5; pointer-events: none; }

/* ---------- Responsive ---------- */
@media (min-width: 600px) {
  .kb-card { grid-column: span 6; }
}
@media (min-width: 960px) {
  .kb-card { grid-column: span 4; }
}