/* ==========================================================================
   KHẢO THÍ VIỆT - THƯ VIỆN SGK & HỌC LIỆU NXB GIÁO DỤC VIỆT NAM
   Nguồn chính thức: taphuan.nxbgd.vn — Chuẩn GDPT 2018
   ========================================================================== */

.nxbgd-library-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* HEADER TOP */
.nxbgd-header {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg, 16px);
  padding: 28px 32px 0;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.nxbgd-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.nxbgd-official-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #EFF6FF;
  color: #1D4ED8;
  border: 1px solid #BFDBFE;
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 700;
}

[data-theme="dark"] .nxbgd-official-badge {
  background: #1E293B;
  color: #60A5FA;
  border-color: #3B82F6;
}

.hero-titles .hero-title {
  font-family: var(--font-heading, 'Quicksand', sans-serif);
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.hero-titles .hero-desc {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 860px;
}

/* STATS STRIP */
.nxbgd-stats-strip {
  display: flex;
  gap: 14px;
  margin: 20px 0 24px;
  flex-wrap: wrap;
}

.stat-pill {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 8px 18px;
  border-radius: 12px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.stat-pill .stat-num {
  font-size: 20px;
  font-weight: 900;
  color: var(--primary-navy, #1E40AF);
}

.stat-pill .stat-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-secondary);
}

.stat-pill.highlight {
  background: #F0FDF4;
  border-color: #BBF7D0;
}
.stat-pill.highlight .stat-num {
  color: #15803D;
}
[data-theme="dark"] .stat-pill.highlight {
  background: #064E3B;
  border-color: #059669;
}
[data-theme="dark"] .stat-pill.highlight .stat-num {
  color: #34D399;
}

/* TABS */
.nxbgd-tabs {
  display: flex;
  gap: 8px;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  overflow-x: auto;
}

.nxbgd-tab-btn {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 12px 18px;
  font-family: var(--font-main, sans-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: all 0.2s;
}

.nxbgd-tab-btn:hover {
  color: var(--text-primary);
}

.nxbgd-tab-btn.active {
  color: var(--primary-navy, #1E40AF);
  border-bottom-color: var(--primary-navy, #1E40AF);
}

/* FILTER BAR */
.nxbgd-filter-bar {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 18px 22px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.filter-group {
  margin-bottom: 16px;
}

.filter-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.grade-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.grade-chip {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.grade-chip:hover {
  border-color: var(--primary-navy, #1E40AF);
  background: var(--bg-hover);
}

.grade-chip.active {
  background: var(--primary-navy, #1E40AF);
  color: #FFFFFF;
  border-color: var(--primary-navy, #1E40AF);
  box-shadow: 0 2px 6px rgba(30, 64, 175, 0.25);
}

.filter-row-secondary {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  border-top: 1px dashed var(--border-color);
  padding-top: 14px;
}

.filter-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-sublabel {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.styled-select {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 600;
  outline: none;
  cursor: pointer;
}

.styled-select:focus {
  border-color: var(--primary-navy, #1E40AF);
}

.filter-search-box {
  flex: 1;
  min-width: 240px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0 12px;
}

.filter-search-box input {
  width: 100%;
  border: none;
  background: transparent;
  padding: 8px 0;
  font-size: 13.5px;
  color: var(--text-primary);
  outline: none;
}

/* RESULTS & BOOKS GRID */
.nxbgd-results-header {
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--text-secondary);
}

.nxbgd-books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

.nxbgd-book-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.nxbgd-book-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.kntt-card {
  border-left: 4px solid #2563EB;
}

.ctst-card {
  border-left: 4px solid #EA580C;
}

.card-top-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.series-pill {
  font-size: 11.5px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.pill-kntt {
  background: #DBEAFE;
  color: #1E40AF;
}

.pill-ctst {
  background: #FFEDD5;
  color: #C2410C;
}

[data-theme="dark"] .pill-kntt {
  background: #1E3A8A;
  color: #93C5FD;
}

[data-theme="dark"] .pill-ctst {
  background: #7C2D12;
  color: #FDBA74;
}

.grade-pill {
  font-size: 12px;
  font-weight: 800;
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 3px 10px;
  border-radius: 8px;
}

.card-book-title {
  font-family: var(--font-heading, 'Quicksand', sans-serif);
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.35;
}

.card-meta-line {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.card-action-buttons {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-action-resource {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.15s;
}

.sgk-btn {
  background: #2563EB;
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.28);
}

.sgk-btn:hover {
  background: #1D4ED8;
  transform: translateY(-1px);
}

.outline-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.outline-btn:hover {
  background: var(--bg-hover);
}

.sub-resources-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.btn-sub-resource {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 600;
  padding: 7px 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  transition: all 0.15s;
}

.btn-sub-resource:hover {
  background: var(--bg-hover);
  border-color: var(--primary-navy, #1E40AF);
  color: var(--primary-navy, #1E40AF);
}

.btn-sub-resource.tkbd-highlight {
  background: #F0FDF4;
  border-color: #86EFAC;
  color: #166534;
}

[data-theme="dark"] .btn-sub-resource.tkbd-highlight {
  background: #064E3B;
  border-color: #059669;
  color: #6EE7B7;
}

.card-footer-info {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-color);
  font-size: 11.5px;
}

.link-full-detail {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  display: inline-block;
  transition: color 0.15s;
}

.link-full-detail:hover {
  color: var(--primary-navy, #1E40AF);
}

/* PEDAGOGY SECTION */
.nxbgd-pedagogy-container {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.pedagogy-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.sec-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FEF3C7;
  color: #92400E;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 12px;
}

[data-theme="dark"] .sec-badge {
  background: #78350F;
  color: #FDE68A;
}

.sec-title {
  font-family: var(--font-heading, 'Quicksand', sans-serif);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.sec-desc {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.five-steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.step-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  position: relative;
  transition: all 0.2s;
}

.step-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary-navy, #1E40AF);
}

.step-number {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 24px;
  font-weight: 900;
  color: var(--border-color);
}

.step-icon {
  width: 44px;
  height: 44px;
  background: #EFF6FF;
  color: #2563EB;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

[data-theme="dark"] .step-icon {
  background: #1E293B;
  color: #60A5FA;
}

.step-name {
  font-size: 15.5px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-secondary);
}

/* 5 COMPETENCIES */
.competencies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.comp-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
}

.comp-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.comp-header .icon {
  color: var(--primary-navy, #1E40AF);
}

.comp-header h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
}

.comp-card p {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-secondary);
}

/* TRAP TABLE */
.trap-table-wrapper {
  overflow-x: auto;
}

.trap-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.trap-table th {
  background: var(--bg-primary);
  color: var(--text-primary);
  text-align: left;
  padding: 12px 16px;
  font-weight: 800;
  border-bottom: 2px solid var(--border-color);
}

.trap-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: top;
  line-height: 1.5;
}

.trap-table tr:hover td {
  background: var(--bg-hover);
}

/* ASSESSMENTS TAB */
.nxbgd-assessments-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.assess-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px 32px;
  box-shadow: var(--shadow-sm);
}

.assess-title {
  font-family: var(--font-heading, 'Quicksand', sans-serif);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.assess-desc {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.assess-grades-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.assess-grade-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
}

.grade-block-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.forms-chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.form-action-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  transition: all 0.15s;
}

.form-action-card:hover {
  background: var(--bg-hover);
  border-color: var(--primary-navy, #1E40AF);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.f-card-icon {
  width: 40px;
  height: 40px;
  background: #EFF6FF;
  color: #2563EB;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

[data-theme="dark"] .f-card-icon {
  background: #1E293B;
  color: #60A5FA;
}

.f-card-info {
  flex: 1;
}

.f-card-sub {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.f-card-desc {
  font-size: 12px;
  color: var(--text-secondary);
}

.icon-arrow {
  color: var(--text-secondary);
  font-size: 18px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .nxbgd-library-container {
    padding: 16px 12px 40px;
  }
  .nxbgd-header {
    padding: 20px 16px 0;
  }
  .hero-titles .hero-title {
    font-size: 20px;
  }
  .nxbgd-books-grid {
    grid-template-columns: 1fr;
  }
  .pedagogy-section, .assess-banner, .assess-grade-block {
    padding: 20px 16px;
  }
  .sub-resources-grid {
    grid-template-columns: 1fr;
  }
}