/* ============ KNOWLEDGE BASE ============ */

/* Fix: map variable names used in this file to actual app.css definitions */
:root {
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --bg: var(--bg-primary, #f5f6fb);
  --text: var(--text-primary, #1e2138);
  --php: var(--php-purple, #777BB4);
  --danger-light: var(--danger-bg, #fdeef0);
  --success-light: var(--success-bg, #e6f9f1);
  --warning-light: var(--warning-bg, #fef5e7);
  --info-light: var(--info-bg, #ebf3fe);
  --code-bg: #1e293b;
  --shadow: var(--shadow-sm, 0 2px 8px rgba(30,33,56,.06));
}

[data-theme="dark"] {
  --surface: #1a1d28;
  --surface-alt: #222530;
  --code-bg: #0f172a;
}

.kb-header { margin-bottom: 20px; }
.section-subtitle {
  color: var(--text-secondary);
  font-size: 15px;
  margin-top: 6px;
}
.kb-progress-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
}

/* ---- point list ---- */
.kb-point-list { display: flex; flex-direction: column; gap: 12px; }
.kb-point-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.kb-point-card:hover {
  border-color: var(--php);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.kb-point-card:focus-visible {
  outline: none;
  border-color: var(--php);
  box-shadow: 0 0 0 3px rgba(99,102,241,.2);
}
.kb-point-main { min-width: 0; flex: 1; }
.kb-point-title { font-size: 17px; font-weight: 700; }
.kb-point-summary {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 6px 0 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.kb-point-tags { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.kb-time { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; color: var(--text-secondary); }
.kb-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--php-dark);
  background: var(--php-light);
  padding: 2px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.kb-tag svg { width: 13px; height: 13px; }
/* 动画讲解标记 */
.kb-tag-viz { color: #6366f1; background: rgba(99, 102, 241, 0.12); }
/* 动手实践标记 */
.kb-tag-practice { color: #0d9488; background: rgba(13, 148, 136, 0.12); }
.kb-point-arrow { color: var(--text-secondary); flex-shrink: 0; }

/* ---- detail ---- */
.kb-detail-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-top: 14px;
}
.kb-detail-title { font-size: 26px; font-weight: 800; }
.kb-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 32px;
  margin-top: 24px;
  align-items: start;
}
.kb-article { min-width: 0; }

.kb-h {
  font-size: 19px;
  font-weight: 700;
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.kb-h:first-child { margin-top: 0; }
.kb-p { font-size: 15.5px; line-height: 1.85; color: var(--text); margin-bottom: 14px; }
.kb-p code, .kb-steps code {
  background: var(--php-light);
  color: var(--php-dark);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.kb-callout {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius);
  margin: 16px 0;
  font-size: 14.5px;
  line-height: 1.7;
  border-left: 3px solid var(--info);
  background: var(--info-light);
}
.kb-callout svg { flex-shrink: 0; margin-top: 2px; }
.kb-callout-warn { border-color: var(--warning); background: var(--warning-light); }
.kb-callout-good { border-color: var(--success); background: var(--success-light); }
.kb-callout-info { border-color: var(--info); background: var(--info-light); }

.kb-code {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 16px 0;
}
.kb-code-head {
  background: var(--code-header, #1e293b);
  color: #e2e8f0;
  font-size: 12px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  letter-spacing: .03em;
}
.kb-code pre { margin: 0; padding: 14px 16px; background: var(--code-bg, #0f172a); overflow-x: auto; }
.kb-code code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #e2e8f0;
  white-space: pre;
}

.kb-steps { margin: 14px 0; padding-left: 22px; }
.kb-steps li { margin-bottom: 8px; line-height: 1.7; font-size: 15px; color: var(--text); }

.kb-table-wrap { overflow-x: auto; margin: 16px 0; }
.kb-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.kb-table th, .kb-table td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
  line-height: 1.6;
}
.kb-table th { background: var(--surface-alt, #f1f5f9); font-weight: 700; }
.kb-table tbody tr:nth-child(even) { background: var(--surface); }

/* ---- quiz ---- */
.kb-quiz {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 20px 0;
}
.kb-quiz-q { font-weight: 700; font-size: 15.5px; display: flex; gap: 8px; align-items: flex-start; margin-bottom: 14px; }
.kb-quiz-q svg { color: var(--php); flex-shrink: 0; margin-top: 2px; }
.kb-quiz-opts { display: flex; flex-direction: column; gap: 8px; }
.kb-quiz-opt {
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 14.5px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.kb-quiz-opt:hover:not(:disabled) { border-color: var(--php); }
.kb-quiz-opt:disabled { cursor: default; }
.kb-quiz-opt.correct { background: var(--success-light); border-color: var(--success); color: #14532d; font-weight: 600; }
.kb-quiz-opt.wrong { background: var(--danger-light); border-color: var(--danger); color: #7f1d1d; }
.kb-quiz-feedback { margin-top: 12px; font-weight: 700; font-size: 14px; }
.kb-quiz-right { color: var(--success); }
.kb-quiz-wrong { color: var(--danger); }
.kb-quiz-explain { margin-top: 8px; font-size: 14px; line-height: 1.7; color: var(--text-secondary); background: var(--surface-alt, #f8fafc); padding: 10px 14px; border-radius: 8px; }

/* ---- 靶场训练 Range ---- */
.kb-range {
  margin: 24px 0;
  border: 2px solid var(--php);
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(99,102,241,.03) 0%, rgba(168,85,247,.04) 100%);
  transition: box-shadow .3s, border-color .3s;
}
.kb-range-passed {
  border-color: var(--success, #10b981) !important;
  box-shadow: 0 0 0 4px rgba(16,185,129,.1), 0 4px 20px rgba(16,185,129,.12) !important;
}
.kb-range-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: linear-gradient(135deg, var(--php), #7c3aed);
  color: #fff;
}
.kb-range-icon { flex-shrink: 0; }
.kb-range-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .3px;
}
.kb-range-scenario {
  padding: 14px 18px 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}
.kb-range-code {
  margin: 0 18px 12px;
  padding: 12px 14px;
  background: #1e293b;
  color: #e2e8f0;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
}
.kb-range-opts {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 18px 12px;
}
.kb-range-opt {
  display: block;
  width: 100%;
  text-align: left;
  padding: 11px 16px;
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 8px;
  background: var(--surface, #fff);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
  line-height: 1.5;
}
.kb-range-opt:hover:not(:disabled) {
  border-color: var(--php);
  background: rgba(99,102,241,.05);
  transform: translateX(4px);
}
.kb-range-opt:disabled { cursor: default; transform: none; }
.kb-range-opt.correct {
  background: var(--success-light, #d1fae5);
  border-color: var(--success, #10b981);
  color: #065f46;
  font-weight: 600;
}
.kb-range-opt.wrong {
  background: var(--danger-light, #fee2e2);
  border-color: var(--danger, #ef4444);
  color: #991b1b;
}
.kb-range-feedback {
  margin: 0 18px 12px;
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 15px;
}
.kb-range-right {
  background: rgba(16,185,129,.1);
  color: #047857;
  border: 1px solid rgba(16,185,129,.25);
}
.kb-range-wrong {
  background: rgba(239,68,68,.08);
  color: #b91c1c;
  border: 1px solid rgba(239,68,68,.2);
}
.kb-range-sub {
  font-weight: 400;
  font-size: 13px;
  opacity: .8;
}
.kb-range-explain {
  margin: 0 18px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
  background: var(--surface-alt, #f8fafc);
  padding: 12px 16px;
  border-radius: 8px;
  border-left: 3px solid var(--php);
}

[data-theme="dark"] .kb-range {
  background: linear-gradient(135deg, rgba(99,102,241,.08) 0%, rgba(168,85,247,.08) 100%);
}
[data-theme="dark"] .kb-range-code { background: #0f172a; color: #cbd5e1; }
[data-theme="dark"] .kb-range-opt { background: var(--surface, #1e293b); border-color: var(--border, #334155); color: var(--text, #e2e8f0); }
[data-theme="dark"] .kb-range-opt:hover:not(:disabled) { background: rgba(99,102,241,.12); }
[data-theme="dark"] .kb-range-explain { background: rgba(15,23,42,.6); }

/* ============ PRACTICE (代码实操) ============ */
.kb-practice {
  margin: 24px 0;
  border: 2px solid var(--php, #6181f6);
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(97,129,246,.04) 0%, rgba(99,102,241,.05) 100%);
}
.kb-practice-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: linear-gradient(135deg, var(--php, #6181f6), #6366f1);
  color: #fff;
}
.kb-practice-icon { flex-shrink: 0; }
.kb-practice-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .3px;
}
.kb-practice-prompt {
  padding: 14px 18px 4px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}
.kb-practice-prompt code {
  background: var(--code-inline-bg, rgba(97,129,246,.12));
  color: var(--php, #6181f6);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 13px;
}
.kb-practice .kb-practice-editor {
  display: block;
  width: calc(100% - 36px);
  margin: 12px 18px 0;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 13px;
  line-height: 1.6;
  tab-size: 4;
  resize: vertical;
  min-height: 180px;
  background: #1e293b;
  color: #e2e8f0;
  border: 1px solid var(--border, #cbd5e1);
}
.kb-practice .flex.gap-2 { padding: 12px 18px 0; }
.kb-practice-hint {
  margin: 12px 18px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  background: var(--surface-alt, #f1f5f9);
  padding: 10px 14px;
  border-radius: 8px;
  border-left: 3px solid var(--warning, #f59e0b);
}
.kb-practice-solution {
  margin: 12px 18px 0;
  font-size: 14px;
}
.kb-practice-solution .code-result-pre {
  margin: 4px 0 0;
  background: #0f172a;
  color: #cbd5e1;
}
.kb-practice-result { padding: 12px 18px 18px; }

[data-theme="dark"] .kb-practice {
  background: linear-gradient(135deg, rgba(97,129,246,.10) 0%, rgba(99,102,241,.10) 100%);
}
[data-theme="dark"] .kb-practice .kb-practice-editor { background: #0f172a; color: #e2e8f0; border-color: rgba(255,255,255,.14); }
[data-theme="dark"] .kb-practice-hint { background: rgba(15,23,42,.6); }


/* ---- TOC ---- */
.kb-toc {
  position: sticky;
  top: 84px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  align-self: start;
}
.kb-toc-title { font-size: 13px; font-weight: 700; color: var(--text-secondary); margin-bottom: 10px; letter-spacing: .04em; }
.kb-toc-link {
  display: block;
  font-size: 13.5px;
  color: var(--text-secondary);
  padding: 6px 0;
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: color .15s, border-color .15s;
}
.kb-toc-link:hover { color: var(--php); border-color: var(--php); }

.kb-footer-actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

/* ============ VIZ (interactive animations) ============ */
.kviz {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin: 20px 0;
  overflow: hidden;
}
.kviz-stage { background: var(--bg); border-radius: var(--radius); padding: 10px; overflow-x: auto; }
.kviz-svg { width: 100%; height: auto; display: block; }
.kviz-caption {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.kviz-caption svg { color: var(--php); flex-shrink: 0; margin-top: 2px; }
.kviz-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 12px; }

/* B+Tree 搜索框 */
.kb-search-group { display: inline-flex; align-items: center; gap: 6px; }
.kb-search-input {
  width: 130px;
  padding: 5px 10px;
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 6px;
  font-size: 13px;
  background: var(--surface, #fff);
  color: var(--text, #1e293b);
  outline: none;
  transition: border-color 0.2s;
}
.kb-search-input:focus { border-color: var(--php); box-shadow: 0 0 0 3px rgba(99,102,241,.15); }
.kb-search-input::placeholder { color: var(--muted, #94a3b8); }
[data-theme="dark"] .kb-search-input {
  background: var(--surface, #1e293b);
  border-color: var(--border, #334155);
  color: var(--text, #e2e8f0);
}

/* 搜索结果状态 */
.kb-search-found { color: #0a7c4e !important; font-weight: 600; }
.kb-search-miss { color: #dc2626 !important; font-weight: 600; }
.kb-search-warn { color: #d97706 !important; font-weight: 600; }
.kviz-types { display: inline-flex; gap: 6px; background: var(--bg); padding: 4px; border-radius: 8px; }
.ktype-btn {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13.5px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.ktype-btn.active { background: var(--php); color: #fff; }
.kviz-inputrow { display: flex; gap: 8px; margin-bottom: 10px; }
.kviz-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: var(--font-mono);
}
.kviz-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.kviz-chip {
  font-size: 12px;
  background: var(--php-light);
  color: var(--php-dark);
  padding: 3px 9px;
  border-radius: 999px;
  font-family: var(--font-mono);
}
.kviz-stat { margin-top: 12px; font-size: 14px; color: var(--text); }
.kviz-stat.good { color: var(--success); }
.kviz-stat.bad { color: var(--danger); }
.kviz-note { margin-left: 8px; font-weight: 600; }
.kviz-note.good { color: var(--success); }
.kviz-note.bad { color: var(--danger); }

/* SVG primitives */
.k-box { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.k-txt { fill: var(--text); font-size: 13px; font-weight: 600; font-family: var(--font-ui, sans-serif); text-anchor: middle; dominant-baseline: middle; }
.k-sub { fill: var(--text-secondary); font-size: 11px; font-family: var(--font-ui, sans-serif); }
.k-arrow { stroke: var(--php); stroke-width: 2; fill: none; }
.k-arrowhead { fill: var(--php); }
.k-instance { fill: var(--surface); }
.k-factory { fill: var(--php-light); stroke: var(--php); }
.k-output { fill: var(--surface); }
.k-node { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.k-node.n1 { stroke: #6366f1; }
.k-node.n2 { stroke: #10b981; }
.k-node.n3 { stroke: #f59e0b; }
.k-keybox { fill: var(--surface); stroke: var(--php); }
.k-cache { fill: var(--surface); }
.k-db { fill: var(--surface); }
.k-root { fill: var(--php-light); stroke: var(--php); }
.k-leaf { fill: var(--surface); stroke: var(--border); }
.k-mem { fill: var(--surface); stroke: var(--border); }
.k-var { fill: var(--php-light); stroke: var(--php); }
.k-link { stroke: var(--text-secondary); stroke-width: 1.5; fill: none; }
.k-list { stroke: var(--php); stroke-width: 1.5; fill: none; stroke-dasharray: 3 3; }
.k-ring { fill: none; stroke: var(--border); stroke-width: 2; stroke-dasharray: 4 4; }
.ch-node { stroke-width: 2; cursor: default; }
.k-keydash { fill: var(--php); }
.k-arc { stroke: var(--php); stroke-width: 2.5; fill: none; stroke-dasharray: 6 4; animation: kvizDash 1s linear infinite; }

/* active / animation states */
.k-instance.pulse,
.k-db.pulse-red,
.k-node.active,
.k-root.active,
.k-leaf.active,
.ch-node.active { animation-duration: .6s; animation-timing-function: ease; }
.k-instance.pulse { animation-name: kvizPulse; }
.k-db.pulse-red { animation-name: kvizPulseRed; }
.k-node.active { fill: var(--php); stroke: var(--php); }
.k-root.active, .k-leaf.active { fill: var(--php-light); stroke: var(--php); stroke-width: 2.5; }
.ch-node.active { fill: var(--php); stroke: var(--php); }
.k-output.pop { animation: kvizPop .45s ease; transform-box: fill-box; transform-origin: center; }

/* 缓存击穿脉冲粒子 */
.k-pulse { pointer-events: none; filter: drop-shadow(0 0 4px rgba(99,102,241,.5)); }
.k-block-mark { pointer-events: none; font-weight: bold; }

@keyframes kvizPulse {
  0%, 100% { stroke: var(--border); stroke-width: 1.5; }
  50% { stroke: var(--php); stroke-width: 3; }
}
@keyframes kvizPulseRed {
  0%, 100% { stroke: var(--border); stroke-width: 1.5; }
  50% { stroke: var(--danger); stroke-width: 3; }
}
@keyframes kvizPop {
  0% { transform: scale(.82); opacity: .4; }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes kvizDash { to { stroke-dashoffset: -20; } }

/* ---- 相关练习题 / 同分类继续学 ---- */
.kb-related { margin-top: 28px; }
.kb-related-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 17px; font-weight: 700; color: var(--text-primary);
  margin-bottom: 14px;
}
.kb-related-head svg { color: var(--php); }
.kb-related-sub { font-size: 13px; font-weight: 500; color: var(--text-secondary); }

.rel-q-list { display: flex; flex-direction: column; gap: 10px; }
.rel-q-card {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .15s ease, box-shadow .15s ease, transform .12s ease;
}
.rel-q-card:hover {
  border-color: var(--php);
  box-shadow: var(--shadow-sm);
  transform: translateX(2px);
}
.rel-q-main { flex: 1; min-width: 0; }
.rel-q-type {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; color: var(--text-secondary); margin-bottom: 4px;
}
.rel-q-type svg { opacity: .8; }
.rel-q-title {
  font-size: 14.5px; font-weight: 600; color: var(--text-primary);
  line-height: 1.5; margin-bottom: 6px;
}
.rel-q-meta { display: flex; align-items: center; gap: 8px; }
.rel-q-mod { font-size: 12px; color: var(--text-secondary); }
.rel-q-go {
  flex-shrink: 0; color: var(--php);
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--bg-hover);
  transition: background .15s ease;
}
.rel-q-card:hover .rel-q-go { background: var(--php-light); }

/* 同分类小卡片 */
.skill-card-sm { padding: 16px; }
.skill-card-sm .skill-card-title { margin-bottom: 4px; }

@media (max-width: 860px) {
  .kb-layout { grid-template-columns: 1fr; }
  .kb-toc { position: static; top: auto; }
  .kb-detail-head { flex-direction: column; }
}

/* ============ LEARNING PATH DASHBOARD ============ */
.kb-browse-title { margin-top: 32px; }
.kb-path {
  background: linear-gradient(135deg, var(--php-light), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 8px;
}
.kb-path-head { margin-bottom: 18px; }
.kb-path-head .section-title { margin: 0; }
.kb-path-head .section-subtitle { margin-top: 4px; }

.kb-path-dash {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.kb-ring {
  width: 116px; height: 116px; border-radius: 50%;
  background: conic-gradient(var(--php) calc(var(--pct) * 1%), var(--border) 0);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.kb-ring-inner {
  width: 90px; height: 90px; border-radius: 50%;
  background: var(--surface);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  box-shadow: inset 0 0 0 1px var(--border);
}
.kb-ring-num { font-size: 30px; font-weight: 800; color: var(--php-dark); line-height: 1; }
.kb-ring-tot { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

.kb-path-stats { display: flex; gap: 28px; }
.kb-stat { display: flex; flex-direction: column; align-items: flex-start; }
.kb-stat-num { font-size: 26px; font-weight: 800; line-height: 1; }
.kb-stat-lbl { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

.kb-path-cta { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.kb-path-cat-sub { font-size: 13px; color: var(--text-secondary); display: inline-flex; align-items: center; gap: 5px; }
.kb-path-done { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--php-dark); font-size: 15px; }

.kb-path-cats {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px; margin-top: 22px;
}
.kb-path-cat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  cursor: pointer;
  transition: border-color .15s, transform .15s;
}
.kb-path-cat:hover { border-color: var(--php); transform: translateY(-2px); }
.kb-path-cat-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.kb-path-cat-num { font-size: 13px; color: var(--text-secondary); font-weight: 500; }

/* ============ CATEGORY PROGRESS + ORDER BADGE ============ */
.kb-path-progress {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 16px;
}
.kb-path-progress-lbl { font-size: 14px; font-weight: 600; white-space: nowrap; }
.kb-path-progress-track { flex: 1; height: 8px; border-radius: 999px; background: var(--border); overflow: hidden; }
.kb-path-progress-track .progress-fill { height: 100%; background: var(--php); }
.kb-path-progress-num { font-size: 13px; color: var(--text-secondary); white-space: nowrap; }

.kb-order {
  flex-shrink: 0;
  width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800;
  background: var(--border); color: var(--text-secondary);
}
.kb-order-active { background: var(--php-light); color: var(--php-dark); }
.kb-order-done { background: var(--success); color: #fff; }

@media (max-width: 860px) {
  .kb-path-dash { grid-template-columns: 1fr; gap: 18px; justify-items: center; text-align: center; }
  .kb-path-cta { align-items: center; }
  .kb-path-stats { justify-content: center; }
}

.kb-home-cta { margin-top: 16px; display: flex; }

/* ============ PREREQ HINTS ============ */
.kb-prereq {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  margin-top: 8px; font-size: 12px;
}
.kb-prereq-label {
  display: inline-flex; align-items: center; gap: 3px;
  color: var(--text-secondary); font-weight: 600; white-space: nowrap;
}
.kb-prereq-chip {
  display: inline-flex; align-items: center;
  padding: 2px 9px; border-radius: 999px;
  background: var(--php-light); color: var(--php-dark);
  border: 1px solid var(--php); font-weight: 600; cursor: pointer;
  transition: background .15s, transform .15s;
}
.kb-prereq-chip:hover { background: var(--php); color: #fff; transform: translateY(-1px); }
.kb-prereq-ok {
  color: var(--success); font-weight: 600;
  display: inline-flex; align-items: center; gap: 4px;
}

/* ============ PREREQ BANNER (detail page) ============ */
.kb-prereq-banner {
  display: flex; align-items: flex-start; gap: 12px;
  background: #fffbeb; border: 1px solid var(--warning-border, #fde68a);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 18px;
}
.kb-prereq-banner-ico { color: #d97706; margin-top: 1px; flex-shrink: 0; }
.kb-prereq-banner-body { flex: 1; }
.kb-prereq-banner-title { font-weight: 700; color: #92400e; font-size: 14px; margin-bottom: 6px; }
.kb-prereq-banner-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.kb-prereq-banner-ok {
  background: var(--success-light, #e6f9f1);
  border-color: var(--success-border, #b8edd3);
}
.kb-prereq-banner-ok .kb-prereq-banner-ico { color: var(--success); }
.kb-prereq-banner-ok .kb-prereq-banner-title { color: #0a7c4e; }

[data-theme="dark"] .kb-prereq-banner {
  background: rgba(245, 166, 35, 0.08); border-color: rgba(245, 166, 35, 0.25);
}
[data-theme="dark"] .kb-prereq-banner-ico { color: #fbbf24; }
[data-theme="dark"] .kb-prereq-banner-title { color: #fbbf24; }
[data-theme="dark"] .kb-prereq-banner-ok { background: rgba(45, 212, 167, 0.1); border-color: rgba(45, 212, 167, 0.25); }
[data-theme="dark"] .kb-prereq-banner-ok .kb-prereq-banner-title { color: #2dd4a7; }

/* ============ REDIS LOCK: holder highlight ============ */
.k-locked {
  stroke: var(--php) !important;
  stroke-width: 2.5 !important;
  fill: var(--php-light) !important;
}

/* ============ KNOWLEDGE LIST PAGINATION ============ */
.kb-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px dashed var(--border, #e5e7eb);
}
.kb-page-btn {
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid var(--border, #e5e7eb);
  background: var(--bg-card, #fff);
  color: var(--text, #1f2937);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s ease;
}
.kb-page-btn:hover:not(:disabled):not(.active) {
  border-color: var(--php, #6181f6);
  color: var(--php, #6181f6);
}
.kb-page-btn.active {
  background: var(--php, #6181f6);
  border-color: var(--php, #6181f6);
  color: #fff;
  cursor: default;
}
.kb-page-btn:disabled {
  opacity: .4;
  cursor: not-allowed;
}
.kb-page-info {
  margin-left: 8px;
  font-size: 13px;
  color: var(--text-secondary, #6b7280);
  white-space: nowrap;
}
[data-theme="dark"] .kb-pagination { border-top-color: rgba(255,255,255,.12); }
[data-theme="dark"] .kb-page-btn { background: #1e2433; border-color: rgba(255,255,255,.14); color: #e5e7eb; }
[data-theme="dark"] .kb-page-btn:hover:not(:disabled):not(.active) { border-color: var(--php, #6181f6); color: #fff; }
[data-theme="dark"] .kb-page-info { color: #9aa4b2; }
[data-theme="dark"] .kb-tag-viz { color: #a5b4fc; background: rgba(99, 102, 241, 0.18); }
[data-theme="dark"] .kb-tag-practice { color: #5eead4; background: rgba(13, 148, 136, 0.18); }