/**
 * Shared lecture layout + components (Brand Kit).
 * Requires brand-tokens.css. Page <style> only for track-specific extras.
 */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg2);color:var(--text);font-size:17px;line-height:1.8}

.page-header{background:linear-gradient(135deg,var(--teal-800) 0%,var(--blue-900) 55%,var(--purple-800) 100%);color:#fff;padding:3rem 2rem 2.5rem;text-align:center;position:relative;overflow:hidden}
.page-header .badge{display:inline-block;background:rgba(255,255,255,0.15);border:1px solid rgba(255,255,255,0.25);border-radius:20px;padding:4px 16px;font-size:13px;letter-spacing:0.05em;margin-bottom:1rem}
.page-header h1{font-size:2.4rem;font-weight:700;margin-bottom:0.5rem;line-height:1.25}
.page-header .subtitle{font-size:1.1rem;opacity:0.85;margin-bottom:1.5rem}
.header-meta{display:flex;gap:1.5rem;justify-content:center;flex-wrap:wrap;font-size:13px;opacity:0.8}
.header-meta span{display:flex;align-items:center;gap:5px}

.toc-wrapper{max-width:860px;margin:2rem auto;padding:0 1.5rem}
.toc-card{background:var(--bg);border:1px solid var(--border2);border-radius:var(--radius-lg);padding:1.5rem 2rem;box-shadow:var(--shadow)}
.toc-card h2{font-size:1rem;font-weight:600;color:var(--text2);margin-bottom:1rem;text-transform:uppercase;letter-spacing:0.06em}
.toc-grid{display:grid;grid-template-columns:1fr 1fr;gap:0.3rem 2rem}
.toc-grid a{color:var(--teal-600);text-decoration:none;font-size:14.5px;display:flex;align-items:baseline;gap:8px;padding:3px 0}
.toc-grid a:hover{color:var(--teal-800)}
.toc-grid .num{font-size:12px;color:var(--text3);min-width:22px;font-weight:600}

.content{max-width:860px;margin:0 auto;padding:0 1.5rem 4rem}
.part{margin-top:2.5rem;scroll-margin-top:20px}
.part-header{display:flex;align-items:center;gap:14px;margin-bottom:1.25rem;padding-bottom:0.75rem;border-bottom:2px solid var(--border);flex-wrap:wrap}
.part-num{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0;color:#fff}
.part-num.blue{background:var(--blue-600)}.part-num.teal{background:var(--teal-600)}.part-num.amber{background:var(--amber-600)}
.part-num.purple{background:var(--purple-600)}.part-num.coral{background:var(--coral-600)}.part-num.green{background:var(--green-600)}
.part-num.red{background:var(--red-600)}.part-num.pink{background:var(--pink-600)}
.part-title-wrap{flex:1;min-width:0}
.part-title-wrap h2{font-size:1.35rem;font-weight:700;margin:0;color:var(--text)}
.part-title-wrap .time-badge{font-size:12px;color:var(--text3);margin-top:2px;display:flex;align-items:center;gap:4px}

.card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem 1.5rem;margin-bottom:1.25rem;box-shadow:var(--shadow)}
.card h3{font-size:1rem;font-weight:700;margin-bottom:0.6rem;color:var(--text)}
.card h4{font-size:15px;font-weight:700;margin:0.75rem 0 0.4rem;color:var(--teal-800)}
.card p,.card li{font-size:16px;color:var(--text2);margin-bottom:0.5rem}
.card ul,.card ol{padding-left:1.5rem;margin-bottom:0.75rem}

.story-box,.example-box,.practice-box,.misconception-box,.danger-box{
  border-radius:var(--radius-lg);padding:1.25rem 1.5rem;margin:1rem 0 1.25rem;border:1px solid var(--border);
}
.story-box{background:linear-gradient(135deg,var(--teal-50),var(--blue-50));border-color:var(--teal-200)}
.example-box{background:var(--amber-50);border-left:4px solid var(--amber-600)}
.practice-box{background:var(--teal-50);border-left:4px solid var(--teal-600)}
.misconception-box{background:var(--coral-50);border-left:4px solid var(--coral-600)}
.danger-box{background:var(--red-50);border:2px solid var(--coral-600)}
.story-box .tag,.example-box .tag,.practice-box .tag,.misconception-box .tag,.danger-box .tag{
  font-size:12.5px;font-weight:700;letter-spacing:0.4px;display:block;margin-bottom:6px;color:var(--teal-800);
}
.example-box .tag{color:var(--amber-800)}.practice-box .tag{color:var(--teal-800)}
.misconception-box .tag,.danger-box .tag{color:var(--coral-800)}

.sql-block{
  background:#0F1923;color:#E2E8F0;border-radius:var(--radius);padding:1.1rem 1.25rem;
  font-family:var(--mono);font-size:13.5px;line-height:1.65;overflow-x:auto;margin:14px 0;
  direction:ltr;text-align:left;white-space:pre;box-shadow:var(--shadow-lg);
}
.sql-label{font-size:12.5px;font-weight:700;color:var(--teal-800);background:var(--teal-50);display:inline-block;padding:4px 12px;border-radius:20px;margin-bottom:8px}
.result-box{background:var(--green-50);border:1px solid var(--green-200);border-left:4px solid var(--green-600);border-radius:var(--radius);padding:14px 20px;margin:10px 0 16px}

.flow{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:0;margin:1.25rem 0;padding:1rem;background:var(--bg2);border-radius:var(--radius-lg);border:1px solid var(--border)}
.flow-node{background:var(--bg);border:2px solid var(--teal-600);color:var(--text);padding:12px 18px;border-radius:10px;font-weight:600;font-size:15px;text-align:center;min-width:110px;box-shadow:var(--shadow)}
.flow-node.alt{border-color:var(--amber-600)}.flow-node.purple{border-color:var(--purple-600)}
.flow-node.coral{border-color:var(--coral-600)}.flow-node.end{background:var(--teal-600);color:#fff;border-color:var(--teal-800)}
.flow-arrow{display:flex;align-items:center;justify-content:center;color:var(--amber-600);font-size:22px;padding:0 8px;font-weight:700}

.grid-2,.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:1rem 0}
.mini-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;box-shadow:var(--shadow)}
.mini-card h4{font-size:15px;font-weight:700;margin-bottom:0.35rem;color:var(--text)}
.mini-card p{font-size:14px;color:var(--text2);margin:0}

.entity{background:var(--bg);border:2px solid var(--teal-600);border-radius:var(--radius);overflow:hidden;min-width:170px;margin:1rem 0;box-shadow:var(--shadow)}
.entity h4,.entity .entity-title{margin:0;background:var(--teal-600);color:#fff;font-weight:700;padding:8px 14px;font-size:14.5px;text-align:center}
.entity .entity-field{padding:6px 14px;font-size:13.5px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;gap:8px}
.entity .entity-field:last-child{border-bottom:none}
.entity .entity-field.pk{background:var(--amber-50);font-weight:700;color:var(--amber-800)}
.entity .entity-field.fk{color:var(--purple-600);font-weight:600}
.er-row{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:flex-start;margin:20px 0}
.drawer-row,.id-row{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin:20px 0}
.drawer,.id-card{width:130px;border-radius:10px;overflow:hidden;border:2px solid var(--teal-600);background:var(--bg)}
.id-card{width:150px}
.drawer .drawer-top,.id-card .id-top{background:var(--teal-600);color:#fff;text-align:center;padding:8px;font-size:22px}
.drawer .drawer-label,.id-card .id-label{padding:8px;text-align:center;font-size:13px;font-weight:600}
.mindmap-root{background:var(--blue-900);color:#fff;text-align:center;padding:14px 20px;border-radius:12px;font-weight:700;font-size:18px;max-width:220px;margin:0 auto 18px}
.mindmap-branches{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.mindmap-node{border-radius:12px;padding:12px;color:#fff;font-weight:700;font-size:14px;text-align:center}
.mindmap-node span{display:block;font-weight:400;font-size:11.5px;margin-top:6px}
.mindmap-node.n1{background:var(--teal-600)}.mindmap-node.n2{background:var(--amber-600)}.mindmap-node.n3{background:var(--purple-600)}
.mindmap-node.n4{background:var(--coral-600)}.mindmap-node.n5{background:var(--blue-600)}.mindmap-node.n6{background:var(--gray-600)}

.divider{text-align:center;color:var(--text3);margin:2rem 0;letter-spacing:0.4em}
.back-top{display:inline-block;margin-top:0.75rem;color:var(--teal-600);text-decoration:none;font-size:14px;font-weight:600}
.back-top:hover{color:var(--teal-800);text-decoration:underline}

.quiz-card{background:var(--bg);border:1px solid var(--border2);border-radius:var(--radius);padding:1rem 1.25rem;margin-bottom:0.75rem;cursor:pointer}
.quiz-q{font-weight:600;font-size:15px;color:var(--text)}
.quiz-a{display:none;margin-top:10px;padding:10px 12px;border-top:1px dashed var(--border2);font-size:15px;color:var(--teal-800);background:var(--teal-50);border-radius:var(--radius)}
.quiz-card.open .quiz-a{display:block}

.pipeline-lab,.dbc-lab{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem 1.5rem;margin-bottom:1.25rem;box-shadow:var(--shadow)}
.pipeline-lab-title,.dbc-lab h4{font-size:1.05rem;font-weight:700;color:var(--blue-800);margin:0 0 8px}
.pipeline-lab-hint,.dbc-lab .hint{font-size:14px;color:var(--text3);margin-bottom:14px}
.dbc-try{display:inline-block;font-size:12px;font-weight:700;letter-spacing:0.04em;text-transform:uppercase;color:var(--teal-800);background:var(--teal-50);padding:3px 10px;border-radius:20px;margin-bottom:8px}
.dbc-chips,.sql-lab-chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.dbc-chip,.sql-lab-chip{min-height:40px;padding:8px 14px;border-radius:var(--radius);border:1.5px solid var(--border2);background:var(--bg);font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;color:var(--text)}
.dbc-chip:hover,.sql-lab-chip:hover{border-color:var(--teal-600);color:var(--teal-800)}
.dbc-chip.ok,.sql-lab-chip.ok{background:var(--green-50);border-color:var(--green-600);color:var(--green-800)}
.dbc-chip.bad,.sql-lab-chip.bad{background:var(--red-50);border-color:var(--red-600);color:var(--red-800)}
.dbc-result,.sql-lab-result{margin-top:12px;padding:12px 14px;border-radius:var(--radius);background:var(--bg2);border:1px solid var(--border);font-size:14.5px;color:var(--text2);min-height:44px}
.dbc-result.ok,.sql-lab-result.ok{background:var(--green-50);border-color:var(--green-200);color:var(--green-800)}
.dbc-result.bad,.sql-lab-result.bad{background:var(--red-50);border-color:var(--red-200);color:var(--red-800)}
.sql-lab-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin:12px 0}
.sql-lab-controls label{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:600;color:var(--text2)}
.sql-lab-controls select,.sql-lab-controls input{min-height:40px;padding:8px 10px;border-radius:8px;border:1px solid var(--border2);font-family:inherit;font-size:14px;background:var(--bg)}
.sql-lab-btn{min-height:40px;padding:8px 16px;border-radius:var(--radius);border:none;background:var(--teal-600);color:#fff;font-family:inherit;font-size:14px;font-weight:600;cursor:pointer}
.sql-lab-btn:hover{background:var(--teal-800)}
.sql-lab-btn.secondary{background:var(--bg);color:var(--text);border:1px solid var(--border2)}

.table-wrap,.table-scroll{overflow-x:auto;margin-bottom:1.25rem}
table{width:100%;border-collapse:collapse;font-size:15px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
thead th,th{background:var(--teal-800);color:#fff;padding:10px 14px;text-align:right;font-weight:600;font-size:14px}
tbody td,td{padding:9px 14px;border-bottom:1px solid var(--border);color:var(--text2);text-align:right;vertical-align:top}
tbody tr:nth-child(even) td,tr:nth-child(even) td{background:var(--gray-50)}
table td.highlight{background:var(--amber-50);font-weight:700;color:var(--amber-800)}

.page-footer{text-align:center;padding:2rem 1.5rem;font-size:14px;color:var(--text3);border-top:1px solid var(--border)}
.page-footer b{color:var(--teal-800)}
.part h3{color:var(--teal-800);font-size:1.05rem;font-weight:700;margin:1.5rem 0 0.75rem;border-left:4px solid var(--amber-600);padding-left:12px}
.part p,.part li{font-size:16px;color:var(--text2);margin-bottom:0.5rem}
.part ul,.part ol{padding-left:1.5rem;margin-bottom:1rem}
code{font-family:var(--mono);direction:ltr;display:inline-block;font-size:0.92em}

@media(max-width:640px){
  .toc-grid,.grid-2,.grid2,.mindmap-branches{grid-template-columns:1fr}
  .page-header h1{font-size:1.7rem}
  .flow{flex-direction:column}
  .flow-arrow{transform:rotate(90deg);padding:4px 0}
}