[data-theme="dark"]{--bg-primary:#0B1220;--bg-surface:#111A2E;--bg-elevated:#18233D;--bg-input:#0B1220;--bg-hover:rgba(255,255,255,0.04);--border:rgba(255,255,255,0.08);--border-strong:rgba(255,255,255,0.15);--accent:#1D9E75;--accent-hover:#25B687;--accent-light:#5DCAA5;--accent-bg:rgba(29,158,117,0.12);--warn:#F0997B;--warn-bg:rgba(240,153,123,0.12);--danger:#E24B4A;--danger-bg:rgba(226,75,74,0.12);--info:#85B7EB;--info-bg:rgba(133,183,235,0.12);--text-primary:#E6EDF7;--text-secondary:#9BA8BD;--text-muted:#6B7896;--text-on-accent:#04342C;--bit-host-bg:rgba(255,255,255,0.05);--nav-bg:rgba(11,18,32,0.85);--code-string:#5DCAA5;--code-key:#85B7EB;--code-num:#F0997B;--code-keyword:#C58AF9;--shadow-card:0 1px 2px rgba(0,0,0,0.2)}[data-theme="light"]{--bg-primary:#FAFBFC;--bg-surface:#FFFFFF;--bg-elevated:#F4F6F9;--bg-input:#F7F9FB;--bg-hover:rgba(13,24,44,0.03);--border:rgba(13,24,44,0.08);--border-strong:rgba(13,24,44,0.16);--accent:#0F6E56;--accent-hover:#0B5644;--accent-light:#1D9E75;--accent-bg:rgba(29,158,117,0.10);--warn:#BA7517;--warn-bg:rgba(186,117,23,0.10);--danger:#A32D2D;--danger-bg:rgba(163,45,45,0.08);--info:#185FA5;--info-bg:rgba(24,95,165,0.08);--text-primary:#0B1220;--text-secondary:#4E5B73;--text-muted:#8593A8;--text-on-accent:#FFFFFF;--bit-host-bg:rgba(13,24,44,0.05);--nav-bg:rgba(250,251,252,0.85);--code-string:#0F6E56;--code-key:#185FA5;--code-num:#993C1D;--code-keyword:#6B21A8;--shadow-card:0 1px 2px rgba(13,24,44,0.05)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg-primary);color:var(--text-primary);font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;transition:background 0.25s ease,color 0.25s ease}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}input,select,textarea{font-family:inherit}code,pre{font-family:'JetBrains Mono','SF Mono',Menlo,monospace}.nav{position:sticky;top:0;z-index:100;background:var(--nav-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:background 0.25s ease,border-color 0.25s ease}.nav-inner{max-width:1280px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}.logo{display:flex;align-items:center;gap:10px;font-weight:500;font-size:15px}.logo-mark{width:30px;height:30px;border-radius:7px;background:var(--accent);color:var(--text-on-accent);display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;font-size:13px;font-weight:500}.logo-suffix{color:var(--text-muted)}.nav-links{display:flex;gap:24px;font-size:14px;color:var(--text-secondary)}.nav-links a{transition:color 0.15s}.nav-links a:hover,.nav-links a.active{color:var(--text-primary)}.nav-cta{display:flex;align-items:center;gap:8px}.theme-toggle{width:36px;height:36px;border-radius:8px;border:1px solid var(--border-strong);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:all 0.15s}.theme-toggle:hover{background:var(--bg-surface);color:var(--text-primary)}.theme-toggle .icon-moon{display:none}.theme-toggle .icon-sun{display:block}[data-theme="dark"] .theme-toggle .icon-moon{display:block}[data-theme="dark"] .theme-toggle .icon-sun{display:none}@media (max-width:900px){.nav-links{display:none}}@media (max-width:600px){.btn-ghost{display:none}}.btn{padding:8px 16px;border-radius:8px;font-size:14px;font-weight:500;transition:all 0.15s;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}.btn-primary{background:var(--accent);color:var(--text-on-accent)}.btn-primary:hover{background:var(--accent-hover)}.btn-ghost{color:var(--text-secondary)}.btn-ghost:hover{color:var(--text-primary)}.btn-outline{border:1px solid var(--border-strong);color:var(--text-primary)}.btn-outline:hover{background:var(--bg-surface)}.btn-lg{padding:12px 22px;font-size:15px}.btn-sm{padding:6px 12px;font-size:13px}.btn-danger{background:var(--danger-bg);color:var(--danger)}.btn-danger:hover{background:var(--danger);color:white}.container{max-width:1280px;margin:0 auto;padding:0 24px}.container-narrow{max-width:900px;margin:0 auto;padding:0 24px}.section{padding:60px 0}.section-sm{padding:40px 0}.section-lg{padding:80px 0}.page-header{text-align:center;padding:60px 24px 32px}.page-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--accent);background:var(--accent-bg);padding:6px 14px;border-radius:999px;margin-bottom:20px;font-weight:500}.page-eyebrow-dot{width:6px;height:6px;background:var(--accent);border-radius:50%}.page-title{font-size:42px;font-weight:600;line-height:1.15;letter-spacing:-0.8px;margin-bottom:14px}.page-subtitle{font-size:17px;color:var(--text-secondary);max-width:620px;margin:0 auto}h1{font-size:52px;font-weight:600;line-height:1.1;letter-spacing:-1.2px}h2{font-size:32px;font-weight:600;line-height:1.2;letter-spacing:-0.5px}h3{font-size:22px;font-weight:500;line-height:1.3;letter-spacing:-0.3px}h4{font-size:17px;font-weight:500}.accent-text{color:var(--accent)}.accent-mono{color:var(--accent);font-family:'JetBrains Mono',monospace;font-weight:500}@media (max-width:640px){h1{font-size:36px;letter-spacing:-0.6px}h2{font-size:26px}.page-title{font-size:32px}}.card{background:var(--bg-surface);border:1px solid var(--border);border-radius:12px;padding:24px;transition:all 0.2s}.card-hover:hover{border-color:var(--border-strong);transform:translateY(-2px)}.panel{background:var(--bg-surface);border:1px solid var(--border);border-radius:12px;overflow:hidden}.panel-header{padding:14px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:var(--bg-input)}.panel-title{font-size:13px;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;font-weight:500}.panel-body{padding:20px}.input,.select,.textarea{width:100%;background:var(--bg-input);border:1px solid var(--border-strong);color:var(--text-primary);padding:10px 14px;border-radius:8px;font-size:14px;transition:all 0.15s;outline:none}.input-mono{font-family:'JetBrains Mono',monospace;font-size:15px}.input:focus,.select:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-bg)}.input-lg{padding:13px 16px;font-size:16px}.textarea{resize:vertical;min-height:100px;font-family:'JetBrains Mono',monospace}.field{margin-bottom:16px}.label{display:block;font-size:12px;color:var(--text-secondary);margin-bottom:6px;font-weight:500;text-transform:uppercase;letter-spacing:0.5px}.tabs{display:flex;gap:4px;background:var(--bg-input);padding:3px;border-radius:8px;border:1px solid var(--border)}.tab{padding:6px 14px;font-size:13px;color:var(--text-secondary);border-radius:6px;transition:all 0.15s;white-space:nowrap}.tab.active{background:var(--bg-surface);color:var(--text-primary);box-shadow:var(--shadow-card)}[data-theme="dark"] .tab.active{background:var(--bg-elevated)}.stat{background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:12px 14px}.stat-label{font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:0.6px;margin-bottom:6px;font-weight:500}.stat-val{font-family:'JetBrains Mono',monospace;font-size:14px;color:var(--text-primary);font-weight:500;word-break:break-all}.badge{display:inline-block;font-size:11px;padding:3px 8px;border-radius:5px;font-weight:500;text-transform:uppercase;letter-spacing:0.5px}.badge-accent{background:var(--accent-bg);color:var(--accent)}.badge-warn{background:var(--warn-bg);color:var(--warn)}.badge-danger{background:var(--danger-bg);color:var(--danger)}.badge-info{background:var(--info-bg);color:var(--info)}.badge-muted{background:var(--bg-elevated);color:var(--text-muted)}.icon{width:1em;height:1em;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;display:inline-block;vertical-align:middle}footer{border-top:1px solid var(--border);padding:40px 24px 32px;margin-top:80px}.footer-inner{max-width:1280px;margin:0 auto}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:40px;margin-bottom:32px}.footer-brand-col p{font-size:14px;color:var(--text-secondary);margin-top:12px;max-width:280px}.footer-col h5{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);margin-bottom:14px;font-weight:500}.footer-col a{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:8px;transition:color 0.15s}.footer-col a:hover{color:var(--text-primary)}.footer-bottom{border-top:1px solid var(--border);padding-top:24px;display:flex;justify-content:space-between;font-size:13px;color:var(--text-muted);flex-wrap:wrap;gap:12px}@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;gap:24px}}.split-grid{display:grid;grid-template-columns:260px 1fr;gap:32px;align-items:start}.sidebar-nav{position:sticky;top:80px;padding:8px 0}.sidebar-section{margin-bottom:24px}.sidebar-heading{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);margin-bottom:8px;padding:0 12px;font-weight:500}.sidebar-link{display:flex;align-items:center;gap:10px;padding:7px 12px;border-radius:6px;font-size:14px;color:var(--text-secondary);margin-bottom:2px;transition:all 0.15s}.sidebar-link:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-link.active{background:var(--accent-bg);color:var(--accent);font-weight:500}.sidebar-link .icon{width:16px;height:16px;flex-shrink:0}@media (max-width:900px){.split-grid{grid-template-columns:1fr}.sidebar-nav{position:static;display:flex;overflow-x:auto;gap:4px;padding-bottom:8px}.sidebar-section{display:flex;gap:4px;margin-bottom:0}.sidebar-heading{display:none}.sidebar-link{flex-shrink:0}}.code-block{background:var(--bg-surface);border:1px solid var(--border);border-radius:12px;overflow:hidden}.code-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--bg-input)}.code-tabs{display:flex;gap:4px}.code-tab{padding:5px 12px;font-size:12px;color:var(--text-secondary);font-family:'JetBrains Mono',monospace;border-radius:6px;transition:all 0.15s}.code-tab.active{background:var(--bg-elevated);color:var(--accent)}.code-copy{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:5px;cursor:pointer;padding:4px 8px;border-radius:5px;transition:all 0.15s}.code-copy:hover{background:var(--bg-hover);color:var(--text-primary)}.code-body{padding:18px 20px;font-family:'JetBrains Mono',monospace;font-size:13px;line-height:1.7;overflow-x:auto;color:var(--text-primary);white-space:pre}.code-comment{color:var(--text-muted)}.code-string{color:var(--code-string)}.code-key{color:var(--code-key)}.code-num{color:var(--code-num)}.code-keyword{color:var(--code-keyword)}.alert{display:flex;gap:12px;padding:12px 16px;border-radius:8px;font-size:14px;border:1px solid;align-items:flex-start}.alert .icon{flex-shrink:0;margin-top:2px;width:18px;height:18px}.alert-info{background:var(--info-bg);color:var(--info);border-color:var(--info)}.alert-warn{background:var(--warn-bg);color:var(--warn);border-color:var(--warn)}.alert-danger{background:var(--danger-bg);color:var(--danger);border-color:var(--danger)}.alert-success{background:var(--accent-bg);color:var(--accent);border-color:var(--accent)}.table{width:100%;border-collapse:collapse;font-size:14px}.table th{text-align:left;font-size:11px;text-transform:uppercase;letter-spacing:0.6px;color:var(--text-muted);padding:10px 14px;border-bottom:1px solid var(--border);font-weight:500}.table td{padding:12px 14px;border-bottom:1px solid var(--border)}.table tr:last-child td{border-bottom:none}.table tr:hover{background:var(--bg-hover)}.table .mono{font-family:'JetBrains Mono',monospace;font-size:13px}.flex{display:flex}.flex-col{display:flex;flex-direction:column}.items-center{align-items:center}.items-start{align-items:flex-start}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.gap-6{gap:24px}.grid{display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.text-secondary{color:var(--text-secondary)}.text-sm{font-size:13px}.text-xs{font-size:12px}.mono{font-family:'JetBrains Mono',monospace}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}.mb-8{margin-bottom:32px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.w-full{width:100%}@media (max-width:700px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:1fr}}@media (max-width:480px){.grid-3,.grid-4{grid-template-columns:1fr}}.bits{display:flex;gap:2px}.bit{flex:1;height:32px;min-width:0;border-radius:3px;display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;font-size:10px;font-weight:500;transition:background 0.2s}.bit-net{background:var(--accent);color:var(--text-on-accent)}.bit-host{background:var(--bit-host-bg);color:var(--text-muted)}.bit-separator{flex:0 0 1px;background:transparent;margin:0 3px;position:relative}.bit-separator::after{content:'';position:absolute;top:-4px;bottom:-4px;left:50%;width:1px;background:var(--border-strong)}.slider{width:100%;-webkit-appearance:none;appearance:none;height:4px;background:var(--bit-host-bg);border-radius:2px;outline:none}.slider::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;background:var(--accent);border-radius:50%;cursor:pointer;border:3px solid var(--bg-surface)}.slider::-moz-range-thumb{width:18px;height:18px;background:var(--accent);border-radius:50%;cursor:pointer;border:3px solid var(--bg-surface)}.tree-row{display:grid;grid-template-columns:1fr auto auto auto auto auto;gap:12px;align-items:center;padding:10px 14px;background:var(--bg-surface);border:1px solid var(--border);border-radius:8px;margin-bottom:6px;transition:all 0.15s}.tree-row:hover{border-color:var(--border-strong)}.tree-row .cidr-cell{font-family:'JetBrains Mono',monospace;font-weight:500}.tree-depth-1{margin-left:24px}.tree-depth-2{margin-left:48px}.tree-depth-3{margin-left:72px}.tree-depth-4{margin-left:96px}.chat-container{background:var(--bg-surface);border:1px solid var(--border);border-radius:12px;display:flex;flex-direction:column;height:600px}.chat-messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px}.chat-msg{max-width:80%;padding:12px 16px;border-radius:12px;font-size:14px;line-height:1.6}.chat-msg-user{background:var(--accent);color:var(--text-on-accent);align-self:flex-end;border-bottom-right-radius:4px}.chat-msg-ai{background:var(--bg-input);color:var(--text-primary);align-self:flex-start;border-bottom-left-radius:4px;border:1px solid var(--border)}.chat-input-row{padding:14px;border-top:1px solid var(--border);display:flex;gap:8px}.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.pricing-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:12px;padding:32px 24px;display:flex;flex-direction:column}.pricing-card-featured{border:2px solid var(--accent);position:relative}.pricing-badge{position:absolute;top:-10px;left:50%;transform:translateX(-50%);background:var(--accent);color:var(--text-on-accent);padding:3px 12px;border-radius:999px;font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:0.6px}.price{font-size:38px;font-weight:600;letter-spacing:-0.8px;margin:12px 0}.price-suffix{font-size:15px;color:var(--text-muted);font-weight:400}.feature-list{list-style:none;margin:24px 0;flex:1}.feature-list li{padding:8px 0;font-size:14px;display:flex;align-items:center;gap:10px;color:var(--text-secondary)}.feature-list .icon{color:var(--accent);flex-shrink:0;width:16px;height:16px}@media (max-width:800px){.pricing-grid{grid-template-columns:1fr}}.faq-item{border-bottom:1px solid var(--border);padding:20px 0}.faq-question{font-size:16px;font-weight:500;margin-bottom:8px;cursor:pointer;display:flex;justify-content:space-between;align-items:center}.faq-answer{font-size:14px;color:var(--text-secondary);line-height:1.6}@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.4}}.pulse{animation:pulse 2s infinite}@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn 0.3s ease}.ad-slot{background:var(--bg-input);border:1px dashed var(--border-strong);border-radius:8px;padding:12px;text-align:center;color:var(--text-muted);font-size:12px;margin:20px auto}.ad-slot-label{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);margin-bottom:6px}.ad-slot-leaderboard{max-width:728px;min-height:90px;display:flex;align-items:center;justify-content:center}.ad-slot-rectangle{max-width:300px;min-height:250px;display:flex;flex-direction:column;align-items:center;justify-content:center}.ad-slot-banner{max-width:100%;min-height:90px}.ad-slot-inline{background:transparent;border:1px dashed var(--border);margin:30px 0;padding:24px}.export-toolbar{display:flex;gap:8px;flex-wrap:wrap}.export-toolbar .btn{font-size:12px;padding:6px 10px}.legal-content{max-width:760px;margin:0 auto;line-height:1.7}.legal-content h2{font-size:22px;margin:32px 0 12px}.legal-content h3{font-size:17px;margin:24px 0 10px}.legal-content p{margin-bottom:14px;color:var(--text-secondary)}.legal-content ul,.legal-content ol{margin:0 0 16px 24px;color:var(--text-secondary)}.legal-content li{margin-bottom:6px}.legal-content code{background:var(--bg-input);padding:2px 6px;border-radius:4px;font-size:13px;color:var(--accent)}.legal-content strong{color:var(--text-primary)}.legal-meta{background:var(--bg-input);border-left:3px solid var(--accent);padding:12px 16px;border-radius:4px;font-size:13px;color:var(--text-secondary);margin-bottom:32px}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.55);display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px;backdrop-filter:blur(2px)}.modal-content{background:var(--bg-surface);border:1px solid var(--border);border-radius:12px;width:100%;max-width:480px;max-height:90vh;overflow-y:auto;box-shadow:0 24px 60px rgba(0,0,0,0.35);animation:modal-pop 0.18s ease-out}@keyframes modal-pop{from{transform:scale(0.97);opacity:0}to{transform:scale(1);opacity:1}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:18px 24px;border-bottom:1px solid var(--border)}.modal-header h3{margin:0;font-size:16px;font-weight:600}.modal-close{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-muted);width:30px;height:30px;border-radius:6px;display:flex;align-items:center;justify-content:center;line-height:1}.modal-close:hover{background:var(--bg-input);color:var(--text-primary)}.modal-body{padding:20px 24px}.modal-footer{padding:14px 24px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:8px}.form-row{margin-bottom:14px}.form-row label{display:block;font-size:12px;font-weight:500;color:var(--text-secondary);margin-bottom:5px;text-transform:uppercase;letter-spacing:0.4px}.form-row .input{width:100%}.form-row textarea.input{font-family:inherit;resize:vertical;min-height:60px}.form-hint{font-size:11px;color:var(--text-muted);margin-top:4px;min-height:14px}.tag-pill{display:inline-block;padding:1px 7px;background:var(--bg-input);border:1px solid var(--border);border-radius:10px;font-size:10px;color:var(--text-secondary);margin-right:3px;margin-top:2px;font-family:'JetBrains Mono',monospace}.status-allocated{background:var(--accent)}.status-reserved{background:var(--warn)}.status-free{background:var(--text-muted)}.lesson-card.lesson-completed{border-left:3px solid var(--accent);background:linear-gradient(90deg,var(--accent-bg) 0%,var(--bg-surface) 8%)}.lesson-body{font-size:14px;line-height:1.65;color:var(--text-primary)}.lesson-body p{margin-bottom:14px}.lesson-body ul,.lesson-body ol{margin:10px 0 14px 24px;padding:0}.lesson-body li{margin-bottom:6px}.lesson-body strong{color:var(--text-primary)}.lesson-body code{background:var(--bg-input);border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-family:'JetBrains Mono',monospace;font-size:12.5px;color:var(--accent)}.lesson-body pre{background:var(--bg-input);border:1px solid var(--border);border-radius:6px;padding:12px 14px;margin:10px 0 14px 0;overflow-x:auto;font-family:'JetBrains Mono',monospace;font-size:12px;line-height:1.5;color:var(--text-primary)}.lesson-body pre code{background:none;border:none;padding:0;color:inherit;font-size:inherit}.lesson-body table.ref-table{margin:8px 0 14px 0}.lesson-body sup{font-size:70%}.filter-pills{display:flex;gap:6px;flex-wrap:wrap}.filter-pill{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;font-size:12.5px;font-weight:500;border-radius:16px;background:var(--bg-surface);border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;transition:all 0.15s ease;user-select:none}.filter-pill:hover{border-color:var(--accent);color:var(--text-primary)}.filter-pill.active{background:var(--accent);border-color:var(--accent);color:#fff}.filter-pill .pill-count{font-size:11px;opacity:0.7;font-family:'JetBrains Mono',monospace}.filter-pill.active .pill-count{opacity:0.9}.lesson-card-mini{background:var(--bg-surface);border:1px solid var(--border);border-radius:8px;padding:14px 14px 12px 14px;cursor:pointer;transition:all 0.15s ease;display:flex;flex-direction:column;height:100%}.lesson-card-mini:hover{border-color:var(--accent);transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,0.08)}.lesson-card-mini.lesson-completed{border-left:3px solid var(--accent);background:linear-gradient(90deg,var(--accent-bg) 0%,var(--bg-surface) 8%)}.lesson-card-mini h5{margin:0 0 6px 0;font-size:13.5px;font-weight:600;line-height:1.35;color:var(--text-primary)}.lesson-card-mini .micro-summary{font-size:12px;line-height:1.5;color:var(--text-secondary);margin:0;flex:1}.lesson-card-mini .micro-cat{display:inline-block;margin-top:10px;font-size:10.5px;font-weight:600;text-transform:uppercase;letter-spacing:0.4px;color:var(--accent)}.lesson-card-mini .micro-check{float:right;color:var(--accent)}.filter-empty{grid-column:1 / -1;text-align:center;padding:40px 20px;color:var(--text-secondary);font-size:14px}.ad-banner{display:flex;justify-content:center;align-items:center;padding:12px 16px;background:var(--bg-elevated);border-bottom:1px solid var(--border);min-height:0}.ad-banner-inner{display:none}.ad-banner-inner.desktop{width:728px;max-width:100%;min-height:90px}.ad-banner-inner.mobile{width:320px;max-width:100%;min-height:50px}@media (min-width:768px){.ad-banner-inner.desktop{display:block}}@media (max-width:767px){.ad-banner-inner.mobile{display:block}}.ad-banner:has(.ad-banner-inner:empty){}.ad-banner-inner:empty{background:transparent}#consent-banner{position:fixed;bottom:0;left:0;right:0;z-index:9999;background:var(--bg-surface);border-top:1px solid var(--border-strong);box-shadow:0 -4px 24px rgba(0,0,0,0.15);padding:16px 20px}[data-theme="dark"] #consent-banner{box-shadow:0 -4px 24px rgba(0,0,0,0.4)}.consent-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:20px;flex-wrap:wrap}.consent-text{flex:1 1 320px;font-size:13px;color:var(--text-secondary);line-height:1.5}.consent-text strong{color:var(--text-primary);display:block;margin-bottom:2px;font-size:14px}.consent-text a{color:var(--accent);text-decoration:underline}.consent-actions{display:flex;gap:10px;flex-shrink:0}.consent-btn{font-size:13px;padding:8px 16px;border-radius:6px;border:1px solid var(--border-strong);background:var(--bg-elevated);color:var(--text-primary);cursor:pointer;font-family:inherit;font-weight:500;transition:background 120ms ease,border-color 120ms ease}.consent-btn:hover{border-color:var(--accent)}.consent-btn.consent-accept{background:var(--accent);color:white;border-color:var(--accent)}.consent-btn.consent-accept:hover{background:var(--accent-hover,var(--accent));filter:brightness(1.05)}@media (max-width:640px){.consent-inner{flex-direction:column;align-items:stretch}.consent-actions{justify-content:stretch}.consent-actions .consent-btn{flex:1}}
/* ============ TOOL CONTEXT — content section below each tool ============ */
.tool-context{max-width:920px;margin:48px auto 0;padding:0 24px}
.tool-context h2{font-size:22px;font-weight:600;letter-spacing:-0.3px;margin-bottom:14px;margin-top:32px}
.tool-context h2:first-child{margin-top:0}
.tool-context h3{font-size:17px;font-weight:600;margin:24px 0 10px;color:var(--text-primary)}
.tool-context p{font-size:15px;color:var(--text-secondary);line-height:1.7;margin-bottom:14px}
.tool-context p strong{color:var(--text-primary);font-weight:600}
.tool-context a{color:var(--accent);text-decoration:none;border-bottom:1px solid transparent;transition:border-color 120ms ease}
.tool-context a:hover{border-bottom-color:var(--accent)}
.tool-context ul,.tool-context ol{margin:0 0 14px 22px;color:var(--text-secondary);font-size:15px;line-height:1.7}
.tool-context li{margin-bottom:6px}
.tool-context li strong{color:var(--text-primary)}
.tool-context code{background:var(--bg-input);border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--accent)}
.tool-context .related-tools{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:14px 0 24px}
.tool-context .related-card{display:block;padding:14px 16px;background:var(--bg-surface);border:1px solid var(--border);border-radius:8px;transition:border-color 120ms ease,transform 120ms ease}
.tool-context .related-card:hover{border-color:var(--accent);transform:translateY(-1px);border-bottom-color:var(--accent)}
.tool-context .related-card-title{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:4px}
.tool-context .related-card-desc{font-size:12.5px;color:var(--text-secondary);line-height:1.45}

/* ============ FAQ BLOCK ============ */
.faq-block .faq-item{padding:18px 0;border-bottom:1px solid var(--border)}
.faq-block .faq-item:last-child{border-bottom:none}
.faq-block .faq-q{font-size:16px;font-weight:600;color:var(--text-primary);margin:0 0 8px}
.faq-block .faq-a{font-size:15px;color:var(--text-secondary);line-height:1.7;margin:0}
.faq-block .faq-a code{background:var(--bg-input);border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--accent)}

/* ============ MOBILE NAVIGATION ============ */
/* Hamburger button — hidden on desktop, shown ≤900px */
.nav-hamburger{display:none;width:40px;height:40px;border-radius:8px;border:1px solid var(--border-strong);background:transparent;color:var(--text-primary);align-items:center;justify-content:center;cursor:pointer;transition:background 120ms ease,border-color 120ms ease;padding:0}
.nav-hamburger:hover{background:var(--bg-surface)}
.nav-hamburger .icon-x{display:none}
.nav-hamburger[aria-expanded="true"] .icon-bars{display:none}
.nav-hamburger[aria-expanded="true"] .icon-x{display:block}

/* Mobile nav panel — slides below the nav bar */
.mobile-nav-panel{display:none;flex-direction:column;background:var(--nav-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:8px 16px 14px}
.mobile-nav-panel .mobile-nav-link{display:block;padding:11px 14px;font-size:15px;color:var(--text-secondary);border-radius:8px;transition:background 120ms ease,color 120ms ease;border:1px solid transparent}
.mobile-nav-panel .mobile-nav-link:hover{background:var(--bg-hover);color:var(--text-primary)}
.mobile-nav-panel .mobile-nav-link.active{background:var(--accent-bg);color:var(--accent);font-weight:500}

/* ≤900px — show hamburger, allow panel to show when not [hidden] */
@media (max-width:900px){
  .nav-hamburger{display:inline-flex}
  .mobile-nav-panel:not([hidden]){display:flex}
}

/* Prevent body scroll when mobile nav is open (optional, minor polish) */
body.mobile-nav-open{overflow:hidden}

/* On phone-sized screens, the hamburger is primary — hide redundant "Get started" CTA */
@media (max-width:520px){
  .nav-cta .btn-primary{display:none}
}