:root {
  --bg: #0e1117; --bg2: #161b27; --bg3: #1c2333; --panel: #1a2035;
  --border: #2a3348; --border2: #374060;
  --text: #cdd5e0; --text2: #8892a4; --text3: #5a6478;
  --lime: #a8e063; --cyan: #38d9d9; --amber: #f5a623; --coral: #ff6b6b; --violet: #a78bfa; --sky: #60a5fa;
  --green: #34d399; --yellow: #fbbf24;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Sans Thai', sans-serif;
  --sidebar: 240px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html,body{height:100%;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:14px;line-height:1.6;overflow:hidden;}

/* ── SHELL ── */
#shell{display:flex;height:100vh;}

/* ── SIDEBAR ── */
#sidebar{width:var(--sidebar);flex-shrink:0;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;}
#logo{padding:18px 16px 14px;border-bottom:1px solid var(--border);}
#logo-title{font-size:13px;font-weight:700;color:var(--text);letter-spacing:.3px;}
#logo-sub{font-size:11px;color:var(--text3);margin-top:2px;}
#search-wrap{padding:10px 12px;border-bottom:1px solid var(--border);}
#search{width:100%;background:var(--bg3);border:1px solid var(--border);border-radius:7px;padding:6px 10px;color:var(--text);font-family:var(--sans);font-size:12px;outline:none;}
#search:focus{border-color:var(--cyan);}
#search::placeholder{color:var(--text3);}
.sb-section{padding:16px 12px 8px;font-size:10px;font-weight:700;color:var(--text3);letter-spacing:1.5px;text-transform:uppercase;}
.sb-item{display:flex;align-items:center;gap:8px;padding:7px 12px;cursor:pointer;font-size:12.5px;color:var(--text2);border-radius:0;transition:all .15s;position:relative;border-left:2px solid transparent;}
.sb-item:hover{background:rgba(255,255,255,.04);color:var(--text);}
.sb-item.active{background:rgba(56,217,217,.06);color:var(--cyan);border-left-color:var(--cyan);}
.sb-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0;}
.sb-pages{padding:0 12px 16px;}
.sb-page{font-size:11.5px;color:var(--text3);padding:5px 8px;cursor:pointer;border-radius:5px;margin-bottom:1px;transition:all .15s;}
.sb-page:hover,.sb-page.active{background:rgba(255,255,255,.04);color:var(--text2);}
#sidebar-bottom{margin-top:auto;padding:12px;border-top:1px solid var(--border);}
.kbd{display:inline-flex;align-items:center;justify-content:center;background:var(--bg3);border:1px solid var(--border2);border-radius:4px;padding:1px 5px;font-size:10px;font-family:var(--mono);color:var(--text3);}

/* ── MAIN AREA ── */
#main{flex:1;display:flex;flex-direction:column;overflow:hidden;}

/* TOPBAR */
#topbar{padding:12px 28px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px;flex-shrink:0;}
#breadcrumb{font-size:12px;color:var(--text3);}
#breadcrumb span{color:var(--text2);}
#breadcrumb b{color:var(--text);}
#page-tags{display:flex;gap:6px;margin-left:auto;}
.ptag{padding:2px 10px;border-radius:12px;font-size:11px;font-weight:600;cursor:pointer;transition:all .15s;border:1px solid transparent;}
.ptag.viz{background:rgba(96,165,250,.1);color:var(--sky);border-color:rgba(96,165,250,.25);}
.ptag.cheat{background:rgba(168,224,99,.1);color:var(--lime);border-color:rgba(168,224,99,.25);}
.ptag.tut{background:rgba(167,139,250,.1);color:var(--violet);border-color:rgba(167,139,250,.25);}
.ptag.active,.ptag:hover{opacity:.7;}

/* CONTENT */
#content{flex:1;overflow-y:auto;padding:32px 32px 60px;scroll-behavior:smooth;}
#content::-webkit-scrollbar{width:5px;}
#content::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px;}

/* TOC */
#toc-panel{width:190px;flex-shrink:0;padding:28px 16px;border-left:1px solid var(--border);overflow-y:auto;}
#toc-panel::-webkit-scrollbar{display:none;}
#toc-title{font-size:10px;font-weight:700;color:var(--text3);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:12px;}
.toc-item{font-size:12px;color:var(--text3);padding:4px 0 4px 8px;cursor:pointer;border-left:1px solid var(--border);transition:all .15s;display:block;}
.toc-item:hover,.toc-item.active{color:var(--cyan);border-left-color:var(--cyan);}
.toc-sub{padding-left:16px;font-size:11px;}

/* ── PAGE SECTIONS ── */
.page-header{margin-bottom:28px;}
.page-title{font-size:26px;font-weight:700;color:var(--text);line-height:1.2;margin-bottom:6px;}
.page-desc{color:var(--text2);font-size:13.5px;line-height:1.6;max-width:640px;}
.sec-anchor{padding-top:8px;}
.sec-title{font-size:16px;font-weight:700;color:var(--text);margin:32px 0 14px;padding-bottom:8px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px;}
.sub-title{font-size:13.5px;font-weight:600;color:var(--text);margin:20px 0 10px;}

/* ── TABS ── */
.tabs{display:flex;gap:2px;background:var(--bg3);border:1px solid var(--border);border-radius:9px;padding:3px;margin-bottom:20px;width:fit-content;}
.tab-btn{padding:5px 16px;border-radius:6px;font-size:12px;font-weight:600;font-family:var(--sans);cursor:pointer;background:none;border:none;color:var(--text3);transition:all .2s;}
.tab-btn.active{background:var(--bg2);color:var(--text);box-shadow:0 1px 4px rgba(0,0,0,.3);}
.tab-pane{display:none;}.tab-pane.active{display:block;}

/* ── DIAGRAM ── */
.diagram-wrap{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:24px;margin:0 0 20px;position:relative;overflow:hidden;}
.diagram-label{font-size:10px;font-weight:700;color:var(--text3);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:16px;}

/* ── ANIMATED ARCH ── */
.arch-svg{width:100%;height:auto;}
@keyframes dashFlow{to{stroke-dashoffset:-24;}}
@keyframes dashFlow2{to{stroke-dashoffset:24;}}
@keyframes pkFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.5}}
.flow-a{stroke-dasharray:6 4;animation:dashFlow 1.8s linear infinite;}
.flow-b{stroke-dasharray:6 4;animation:dashFlow2 2.2s linear infinite;}
.flow-c{stroke-dasharray:6 4;animation:dashFlow 3s linear infinite;}
.float-node{animation:pkFloat 3s ease-in-out infinite;}
.pulse{animation:blink 2s ease-in-out infinite;}

/* ── CODE BLOCK ── */
.code-wrap{background:#080d18;border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:12px 0;}
.code-top{background:var(--bg3);padding:8px 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);}
.code-lang{font-size:11px;color:var(--cyan);font-family:var(--mono);letter-spacing:.8px;}
.copy-btn{background:none;border:1px solid var(--border);color:var(--text3);padding:2px 8px;border-radius:4px;font-size:11px;cursor:pointer;font-family:var(--sans);transition:all .2s;}
.copy-btn:hover{border-color:var(--lime);color:var(--lime);}
pre{padding:14px 16px;overflow-x:auto;font-family:var(--mono);font-size:12px;line-height:1.8;}
.kw{color:#ff79c6;}.fn{color:#8be9fd;}.st{color:#a8ff68;}.cm{color:#4d5e7a;font-style:italic;}.nm{color:#ffb86c;}.op{color:#6be5fd;}.bl{color:#50fa7b;}

/* ── CARDS ── */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:14px 0;}
.card{background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:14px 16px;transition:border-color .2s;}
.card:hover{border-color:var(--border2);}
.card-title{font-weight:600;font-size:13px;margin-bottom:5px;display:flex;align-items:center;gap:7px;}
.card-body{font-size:12px;color:var(--text2);line-height:1.65;}
.card-tags{display:flex;gap:5px;margin-top:8px;flex-wrap:wrap;}

/* ── STEPS ── */
.steps{display:flex;flex-direction:column;gap:8px;margin:12px 0;}
.step{display:flex;gap:12px;background:var(--bg2);border:1px solid var(--border);border-radius:9px;padding:12px 14px;transition:border-color .2s;}
.step:hover{border-color:var(--border2);}
.step-num{min-width:26px;height:26px;background:linear-gradient(135deg,var(--cyan),var(--violet));border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#000;flex-shrink:0;}
.step-title{font-weight:600;font-size:12.5px;margin-bottom:3px;}
.step-desc{font-size:11.5px;color:var(--text2);line-height:1.6;}

/* ── ALERT ── */
.alert{border-radius:8px;padding:10px 14px;font-size:12.5px;display:flex;gap:9px;margin:10px 0;line-height:1.6;}
.alert-tip{background:rgba(168,224,99,.05);border:1px solid rgba(168,224,99,.2);}
.alert-warn{background:rgba(245,166,35,.06);border:1px solid rgba(245,166,35,.25);color:var(--amber);}
.alert-info{background:rgba(56,217,217,.04);border:1px solid rgba(56,217,217,.18);}
.alert-danger{background:rgba(255,107,107,.05);border:1px solid rgba(255,107,107,.2);color:var(--coral);}

/* ── PILLS ── */
.pill{display:inline-block;padding:1px 8px;border-radius:10px;font-size:11px;font-weight:600;margin:2px;}
.pg{background:rgba(168,224,99,.1);color:var(--lime);border:1px solid rgba(168,224,99,.2);}
.pc{background:rgba(56,217,217,.1);color:var(--cyan);border:1px solid rgba(56,217,217,.2);}
.pv{background:rgba(167,139,250,.1);color:var(--violet);border:1px solid rgba(167,139,250,.2);}
.pa{background:rgba(245,166,35,.1);color:var(--amber);border:1px solid rgba(245,166,35,.2);}
.pr{background:rgba(255,107,107,.1);color:var(--coral);border:1px solid rgba(255,107,107,.2);}
.ps{background:rgba(96,165,250,.1);color:var(--sky);border:1px solid rgba(96,165,250,.2);}

/* ── TABLE ── */
.tbl{width:100%;border-collapse:collapse;font-size:12px;margin:12px 0;}
.tbl th{background:var(--bg3);padding:8px 12px;text-align:left;color:var(--text2);font-weight:600;border-bottom:1px solid var(--border);}
.tbl td{padding:8px 12px;border-bottom:1px solid rgba(42,51,72,.5);vertical-align:top;}
.tbl tr:hover td{background:rgba(56,217,217,.02);}

/* ── HIGHLIGHT ── */
.hl-box{background:rgba(56,217,217,.04);border:1px solid rgba(56,217,217,.15);border-radius:10px;padding:14px 16px;margin:14px 0;}
.hl-box h4{color:var(--cyan);font-size:12.5px;margin-bottom:5px;}
.hl-box p{font-size:12px;color:var(--text2);line-height:1.7;}

/* ── GRID DIR TREE ── */
.tree{font-family:var(--mono);font-size:12px;line-height:2;background:#080d18;border:1px solid var(--border);border-radius:10px;padding:14px 18px;overflow-x:auto;white-space:pre-wrap;}
.tr{color:var(--text3);}
.tf{color:var(--lime);}
.ty{color:var(--amber);}
.td{color:var(--cyan);}
.tc2{color:var(--violet);}
.tn{color:var(--coral);}

/* ── COMING SOON ── */
.coming-soon{text-align:center;padding:60px 20px;color:var(--text3);}
.coming-soon h3{font-size:18px;color:var(--text2);margin-bottom:8px;}
.coming-soon p{font-size:13px;}

/* ── SEARCH RESULTS ── */
#search-overlay{display:none;position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.7);backdrop-filter:blur(4px);}
#search-modal{position:absolute;top:80px;left:50%;transform:translateX(-50%);width:560px;background:var(--bg2);border:1px solid var(--border2);border-radius:14px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.5);}
#s-input{width:100%;background:transparent;border:none;padding:16px 20px;color:var(--text);font-size:15px;font-family:var(--sans);outline:none;border-bottom:1px solid var(--border);}
#s-results{max-height:360px;overflow-y:auto;}
.s-result{padding:12px 20px;cursor:pointer;display:flex;gap:10px;align-items:flex-start;border-bottom:1px solid rgba(42,51,72,.4);transition:background .15s;}
.s-result:hover{background:rgba(255,255,255,.03);}
.s-result-cat{font-size:11px;color:var(--text3);margin-top:1px;flex-shrink:0;width:80px;}
.s-result-title{font-size:13px;font-weight:600;color:var(--text);}
.s-result-desc{font-size:11.5px;color:var(--text2);margin-top:2px;}

/* SCROLLBAR for content */
#content::-webkit-scrollbar-track{background:transparent;}

/* ── LAB TAB TAG ── */
.ptag.lab{background:rgba(245,166,35,.1);color:var(--amber);border-color:rgba(245,166,35,.25);}

/* ── LAB CHECKLIST ── */
.lab-step{display:flex;gap:12px;background:var(--bg2);border:1px solid var(--border);border-radius:9px;padding:11px 14px;margin-bottom:6px;transition:all .2s;align-items:flex-start;}
.lab-step.done{background:rgba(168,224,99,.04);border-color:rgba(168,224,99,.25);}
.lab-step.done .lab-step-title{text-decoration:line-through;color:var(--text3);}
.lab-check{flex-shrink:0;cursor:pointer;padding-top:1px;}
.lab-check input[type=checkbox]{display:none;}
.lab-check-box{display:flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:5px;border:1.5px solid var(--border2);background:var(--bg3);transition:all .2s;flex-shrink:0;}
.lab-check input:checked ~ .lab-check-box{background:var(--lime);border-color:var(--lime);}
.lab-check input:checked ~ .lab-check-box::after{content:'✓';font-size:12px;font-weight:700;color:#0e1117;}
.lab-step-body{flex:1;}
.lab-step-title{font-size:13px;font-weight:600;color:var(--text);line-height:1.4;}
.lab-step-desc{font-size:11.5px;color:var(--text2);margin-top:3px;line-height:1.5;}

/* ── LAB PROGRESS ── */
.lab-progress-wrap{display:flex;align-items:center;gap:12px;margin:10px 0 18px;}
.lab-progress-bar{flex:1;height:6px;background:var(--bg3);border-radius:3px;overflow:hidden;border:1px solid var(--border);}
.lab-progress-fill{height:100%;background:linear-gradient(90deg,var(--cyan),var(--lime));border-radius:3px;transition:width .4s ease;width:0%;}
.lab-progress-pct{font-size:11px;color:var(--text3);font-family:var(--mono);white-space:nowrap;}

/* ── SIDEBAR STATUS BADGES ── */
.sb-badge{font-size:9px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;padding:1px 5px;border-radius:3px;margin-left:auto;flex-shrink:0;}
.sb-badge-wip{background:rgba(251,191,36,.12);color:var(--yellow);border:1px solid rgba(251,191,36,.3);}
.sb-badge-stub{background:rgba(90,100,120,.2);color:var(--text3);border:1px solid rgba(90,100,120,.3);}
.sb-item.stub{opacity:.65;}
.sb-item.stub:hover{opacity:.85;}
.sb-dot-wip{animation:blink 2s ease-in-out infinite;}

/* ── LAB CARD GRID (multi-lab) ── */
.lab-card-grid{display:flex;flex-direction:column;gap:10px;margin:14px 0;}
.lab-card{display:flex;align-items:center;gap:14px;background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:16px 18px;cursor:pointer;transition:all .2s;}
.lab-card:hover{border-color:var(--cyan);background:rgba(56,217,217,.04);transform:translateX(3px);}
.lab-card-icon{font-size:26px;flex-shrink:0;width:40px;text-align:center;}
.lab-card-body{flex:1;}
.lab-card-title{font-size:14px;font-weight:700;color:var(--text);margin-bottom:6px;}
.lab-card-meta{display:flex;flex-wrap:wrap;gap:5px;align-items:center;}
.lab-card-progress{font-size:11px;color:var(--lime);margin-top:5px;}
.lab-card-arrow{font-size:22px;color:var(--text3);flex-shrink:0;transition:transform .2s;}
.lab-card:hover .lab-card-arrow{transform:translateX(4px);color:var(--cyan);}
.lab-back-btn{display:inline-flex;align-items:center;gap:6px;background:var(--bg3);border:1px solid var(--border);color:var(--text2);padding:6px 14px;border-radius:7px;font-size:12px;cursor:pointer;font-family:var(--sans);margin-bottom:20px;transition:all .15s;}
.lab-back-btn:hover{border-color:var(--cyan);color:var(--cyan);}

/* ── SIDEBAR SUB-ITEMS ── */
.sb-sub-group{margin:2px 0 6px 0;}
.sb-subitem{display:flex;align-items:center;gap:8px;padding:5px 12px 5px 32px;font-size:11.5px;color:var(--text3);cursor:pointer;border-radius:6px;transition:all .15s;position:relative;}
.sb-subitem::before{content:'';position:absolute;left:18px;top:50%;width:6px;height:1px;background:var(--border);}
.sb-subitem:hover{color:var(--text);background:rgba(255,255,255,.04);}
.sb-subitem.active{color:var(--cyan);background:rgba(56,217,217,.08);}
.sb-subitem.active::before{background:var(--cyan);}
.sb-subitem-icon{font-size:12px;flex-shrink:0;}