:root{--bg:#0c0d10;--panel:#14161b;--panel2:#1b1e25;--paper:#f4f1e7;--ink:#1a1a1d;--muted:#aeb3bd;--line:#30343d;--red:#a6192e;--red2:#6e0c1c;--teal:#3ad6d0;--gold:#e4b858;--ok:#72d59b;--warn:#ffd07a;--danger:#ff8b91;--radius:18px;--shadow:0 20px 60px rgba(0,0,0,.28);--content:1120px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--bg);color:#f8f8f6;font:16px/1.65 Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}button,input{font:inherit}a{color:inherit}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;z-index:99;background:#fff;color:#000;padding:10px 16px;border-radius:8px}
.topbar{position:sticky;top:0;z-index:40;height:72px;display:flex;align-items:center;gap:18px;padding:0 28px;background:rgba(12,13,16,.94);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-weight:850;letter-spacing:.02em}.brand img{width:42px;height:42px;object-fit:contain}.brand span{color:var(--teal)}.top-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.icon-btn,.menu-btn{border:1px solid var(--line);background:var(--panel2);color:#fff;border-radius:12px;padding:10px 14px;cursor:pointer}.menu-btn{display:none}.progress{position:absolute;left:0;bottom:-1px;height:3px;width:0;background:linear-gradient(90deg,var(--red),var(--teal));transition:width .1s linear}
.layout{display:grid;grid-template-columns:288px minmax(0,1fr);max-width:1500px;margin:auto}.sidebar{position:sticky;top:72px;height:calc(100vh - 72px);overflow:auto;padding:24px 18px 40px;border-right:1px solid var(--line);background:#101116}.search{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#191b21;color:#fff;margin-bottom:18px}.nav-label{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);padding:0 10px 8px}.toc{display:grid;gap:4px}.toc a{display:flex;gap:10px;align-items:center;text-decoration:none;color:#cdd1d8;padding:9px 10px;border-radius:10px;font-size:.9rem}.toc a span{color:#7f8794;font-variant-numeric:tabular-nums}.toc a:hover,.toc a.active{background:#242730;color:#fff}.toc a.active span{color:var(--teal)}
main{min-width:0}.hero{min-height:72vh;padding:78px 6vw 56px;display:grid;align-items:center;background:radial-gradient(circle at 78% 12%,rgba(166,25,46,.35),transparent 31%),linear-gradient(145deg,#0d0f13,#161017 70%,#230810)}.hero-inner{max-width:var(--content);margin:auto;width:100%;display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}.eyebrow{color:var(--teal);font-weight:800;letter-spacing:.15em;text-transform:uppercase;font-size:.78rem}.hero h1{font-size:clamp(3rem,7vw,6.4rem);line-height:.92;margin:.2em 0}.hero p{max-width:660px;font-size:1.2rem;color:#c8cbd2}.hero-card{background:linear-gradient(160deg,#1d2027,#111318);border:1px solid #353945;border-radius:28px;padding:18px;box-shadow:var(--shadow);transform:rotate(1deg)}.hero-card img{width:100%;display:block;border-radius:17px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border-radius:12px;padding:12px 18px;font-weight:800}.btn.primary{background:var(--teal);color:#071213}.btn.secondary{border:1px solid #555b67;color:#fff}.meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.pill{padding:6px 10px;border-radius:999px;background:#22252d;color:#cfd3da;font-size:.82rem}
.chapter{padding:76px 6vw;border-top:1px solid #272a31}.chapter:nth-child(even){background:#101216}.chapter-inner{max-width:var(--content);margin:auto}.chapter-head{display:grid;grid-template-columns:90px 1fr;gap:26px;align-items:start;margin-bottom:36px}.chapter-no{font:800 3.6rem/1 ui-monospace,monospace;color:#42464f}.chapter h2{font-size:clamp(2rem,4vw,3.7rem);line-height:1.05;margin:0 0 10px}.lead{color:#b9bec7;font-size:1.12rem;max-width:780px}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.card h3{margin-top:0;font-size:1.2rem}.card p:last-child{margin-bottom:0}.steps{counter-reset:step;display:grid;gap:14px;padding:0;list-style:none}.steps li{counter-increment:step;position:relative;padding:18px 18px 18px 62px;background:var(--panel);border:1px solid var(--line);border-radius:14px}.steps li:before{content:counter(step);position:absolute;left:16px;top:16px;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--teal);color:#061213;font-weight:900}.steps strong{display:block;color:#fff;margin-bottom:2px}.kicker{display:block;color:var(--teal);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;font-weight:800}
.figure{margin:30px 0;background:#08090b;border:1px solid #353945;border-radius:20px;overflow:hidden;box-shadow:var(--shadow)}.figure img{display:block;width:100%;height:auto}.figure figcaption{padding:14px 18px;color:#bac0c9;background:#15171c}.annotated{position:relative}.callout{position:absolute;width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--gold);color:#18130a;font-weight:900;box-shadow:0 0 0 4px rgba(228,184,88,.3),0 5px 16px rgba(0,0,0,.45);transform:translate(-50%,-100%);z-index:2}.callout:after{content:"";position:absolute;left:50%;top:100%;transform:translateX(-50%);width:0;height:0;border-left:7px solid transparent;border-right:7px solid transparent;border-top:11px solid var(--gold)}.legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px;padding:14px 18px 18px;background:#15171c}.legend div{display:flex;gap:9px;color:#c9cdd4;font-size:.9rem}.legend b{flex:0 0 24px;height:24px;display:grid;place-items:center;border-radius:50%;background:var(--gold);color:#17120a}
.note,.warning,.success{border-left:4px solid var(--teal);background:#172326;padding:18px 20px;border-radius:0 14px 14px 0;margin:24px 0}.warning{border-color:var(--warn);background:#292416}.success{border-color:var(--ok);background:#15251d}.note strong,.warning strong,.success strong{display:block;margin-bottom:4px}.key{font-family:ui-monospace,monospace;color:#101215;background:var(--paper);padding:2px 7px;border-radius:6px}.diagram{background:#111319;border:1px solid var(--line);border-radius:20px;padding:24px;margin:28px 0;overflow:auto}.flow{min-width:760px;display:flex;align-items:center;justify-content:center;gap:12px}.device{min-width:125px;text-align:center;padding:18px 12px;background:#20232b;border:1px solid #3b404a;border-radius:14px}.device b{display:block;color:var(--teal)}.arrow{color:var(--gold);font-size:1.5rem;font-weight:900}.hierarchy{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;min-width:700px}.hierarchy .device:nth-child(1){border-color:var(--red)}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}.table{width:100%;border-collapse:collapse;min-width:680px}.table th,.table td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}.table th{background:#242731;color:var(--teal)}.table tr:last-child td{border-bottom:0}.checklist{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding:0;list-style:none}.checklist li{padding:14px 15px 14px 44px;position:relative;border:1px solid var(--line);background:var(--panel);border-radius:12px}.checklist li:before{content:"✓";position:absolute;left:16px;color:var(--ok);font-weight:900}.tag{display:inline-block;color:#081415;background:var(--teal);font-size:.72rem;font-weight:900;text-transform:uppercase;letter-spacing:.08em;padding:4px 8px;border-radius:6px;margin-right:6px}.tag.optional{background:var(--gold)}
.accordion{display:grid;gap:10px}.accordion details{border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:0 18px}.accordion summary{cursor:pointer;font-weight:800;padding:17px 0}.accordion details p{color:#c6cad1}.next{display:flex;justify-content:space-between;gap:16px;margin-top:42px;padding-top:24px;border-top:1px solid var(--line)}.next a{text-decoration:none;color:var(--teal);font-weight:800}.footer{padding:50px 6vw;background:#090a0d;border-top:1px solid var(--line);color:#9298a3}.footer-inner{max-width:var(--content);margin:auto;display:flex;justify-content:space-between;gap:24px}.backtop{color:var(--teal)}.hidden-search{display:none!important}.device-switch{text-decoration:none;font-size:.85rem}
.chooser{min-height:100vh;display:grid;place-items:center;padding:42px 24px;background:radial-gradient(circle at 50% 0,rgba(166,25,46,.42),transparent 40%),#0b0c0f}.chooser-shell{width:min(1080px,100%)}.chooser-brand{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:32px;font-weight:900;letter-spacing:.06em}.chooser-brand img{width:54px;height:54px;object-fit:contain}.chooser h1{text-align:center;font-size:clamp(2.3rem,5vw,4.6rem);line-height:1;margin:0 0 14px}.chooser-lead{text-align:center;color:#bcc1c9;font-size:1.1rem;max-width:660px;margin:0 auto 38px}.device-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.device-choice{display:block;text-decoration:none;background:linear-gradient(155deg,#1d2027,#111318);border:1px solid #363b46;border-radius:24px;padding:20px;transition:transform .2s,border-color .2s;box-shadow:var(--shadow)}.device-choice:hover,.device-choice:focus-visible{transform:translateY(-4px);border-color:var(--teal)}.device-preview{height:260px;display:grid;place-items:center;background:#090a0d;border-radius:17px;overflow:hidden;margin-bottom:20px}.device-preview img{width:88%;max-height:92%;object-fit:contain;border-radius:10px}.device-preview.phone img{width:72%;transform:rotate(-1deg)}.device-choice h2{margin:0 0 5px;font-size:1.65rem}.device-choice p{margin:0;color:#afb5bf}.choice-action{display:inline-block;margin-top:16px;color:var(--teal);font-weight:900}.chooser-note{text-align:center;color:#858c97;margin-top:28px;font-size:.9rem}
@media(max-width:980px){.layout{grid-template-columns:1fr}.sidebar{position:fixed;z-index:60;inset:72px auto 0 0;width:min(88vw,330px);transform:translateX(-105%);transition:.25s;box-shadow:var(--shadow)}body.nav-open .sidebar{transform:none}.menu-btn{display:block}.hero-inner{grid-template-columns:1fr}.hero-card{transform:none;max-width:720px}.chapter{padding:58px 24px}.hero{padding:58px 24px}.grid3{grid-template-columns:1fr 1fr}.topbar{padding:0 16px}}
@media(max-width:680px){body{font-size:15px}.brand div{display:none}.top-actions .text-size{display:none}.hero{min-height:auto;padding-top:48px}.hero h1{font-size:3.2rem}.hero p{font-size:1.05rem}.chapter-head{grid-template-columns:52px 1fr;gap:12px}.chapter-no{font-size:2.3rem}.grid2,.grid3,.checklist{grid-template-columns:1fr}.card{padding:19px}.figure{border-radius:12px;margin-left:-10px;margin-right:-10px}.figure img{min-height:210px;object-fit:contain;background:#060709}.legend{grid-template-columns:1fr}.callout{width:26px;height:26px;font-size:.8rem}.callout:after{border-left-width:5px;border-right-width:5px;border-top-width:8px}.footer-inner{display:block}.next{flex-direction:column}.top-actions .btn{display:none}.device-grid{grid-template-columns:1fr}.chooser{padding:28px 18px}.device-preview{height:190px}.chooser h1{font-size:2.55rem}.device-switch{font-size:0;width:42px;height:42px;padding:0;display:grid;place-items:center}.device-switch:after{content:"↔";font-size:1.25rem}}
/* Dedicated tablet edition: stable two-pane navigation from 700–1400 px. */
@media(min-width:700px) and (max-width:1400px){body.tablet-mode{font-size:17px}body.tablet-mode .layout{grid-template-columns:240px minmax(0,1fr)}body.tablet-mode .sidebar{position:sticky;display:block;transform:none;top:72px;width:auto;height:calc(100vh - 72px);padding:18px 14px}body.tablet-mode .menu-btn{display:none}body.tablet-mode .topbar{padding:0 22px}body.tablet-mode .hero{min-height:calc(100vh - 72px);padding:54px 42px}body.tablet-mode .hero-inner{grid-template-columns:1fr;gap:30px}body.tablet-mode .hero-card{max-width:820px;transform:none}body.tablet-mode .chapter{padding:58px 42px}body.tablet-mode .chapter-inner{max-width:980px}body.tablet-mode .chapter-head{grid-template-columns:70px 1fr;gap:20px}body.tablet-mode .chapter-no{font-size:3rem}body.tablet-mode .grid3{grid-template-columns:repeat(2,minmax(0,1fr))}body.tablet-mode .figure{margin:28px 0}body.tablet-mode .figure img{max-height:640px;object-fit:contain;background:#08090b}body.tablet-mode .legend{grid-template-columns:repeat(2,minmax(0,1fr))}body.tablet-mode .toc a{padding:10px;font-size:.86rem}body.tablet-mode .search{font-size:.9rem}}
.course{background:radial-gradient(circle at 88% 5%,rgba(56,211,213,.1),transparent 30%),#0d1014}.course-dashboard{position:sticky;top:84px;z-index:12;display:grid;grid-template-columns:auto minmax(160px,1fr) auto;gap:20px;align-items:center;margin-bottom:24px;padding:18px 20px;background:rgba(28,31,38,.96);border:1px solid #39404a;border-radius:16px;box-shadow:0 12px 35px rgba(0,0,0,.3);backdrop-filter:blur(14px)}.course-dashboard strong{font-size:1.08rem}.course-meter{height:12px;overflow:hidden;background:#090b0e;border:1px solid #3a4049;border-radius:99px}.course-meter span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--teal),var(--ok));transition:width .25s ease}.course-steps{display:grid;gap:13px}.course-step{overflow:hidden;background:var(--panel);border:1px solid var(--line);border-radius:16px;transition:border-color .2s,background .2s}.course-step:has(input:checked){border-color:var(--ok);background:#14231b}.course-step label{display:grid;grid-template-columns:26px 38px 1fr;gap:14px;align-items:center;padding:18px 20px;cursor:pointer}.course-step input{width:22px;height:22px;accent-color:var(--ok)}.course-index{width:36px;height:36px;display:grid;place-items:center;border:1px solid #48505c;border-radius:50%;font-weight:900;color:var(--teal)}.course-step b{display:block;color:#fff;font-size:1.04rem}.course-step small{display:block;margin-top:3px;color:#aeb4bd;font-size:.9rem}.course-step details{padding:0 20px 18px 98px}.course-step summary{width:max-content;color:var(--teal);cursor:pointer;font-weight:800}.course-step details ol{padding-left:20px}.verify{padding:12px 14px;background:#11171a;border-left:3px solid var(--gold);border-radius:0 9px 9px 0}.course-finish{display:flex;align-items:center;gap:18px;margin-top:22px;padding:24px;background:#133021;border:1px solid var(--ok);border-radius:18px}.course-finish>span{width:48px;height:48px;display:grid;place-items:center;border-radius:50%;background:var(--ok);color:#08120c;font-size:1.6rem;font-weight:900}.course-finish strong{font-size:1.25rem}.course-finish p{margin:4px 0 0;color:#c5d7cb}
@media(max-width:680px){.course-dashboard{top:80px;grid-template-columns:1fr auto;gap:12px}.course-meter{grid-column:1/-1;grid-row:2}.course-step label{grid-template-columns:24px 34px 1fr;padding:16px 14px;gap:10px}.course-step details{padding:0 16px 16px 82px}.course-index{width:32px;height:32px}.course-step small{font-size:.82rem}}
.mixer-map .callout{transform:translate(-50%,0)}
.mixer-map .callout:after{top:auto;bottom:100%;border-top:0;border-bottom:11px solid var(--gold)}
.mixer-map .c1{left:5.2%;top:8%}.mixer-map .c2{left:23%;top:8%}.mixer-map .c3{left:68%;top:8%}.mixer-map .c4{left:80%;top:8%}.mixer-map .c5{left:8%;top:74%}
body.tablet-mode .mixer-map .c1{left:5%;top:4.5%}body.tablet-mode .mixer-map .c2{left:82%;top:22%}body.tablet-mode .mixer-map .c3{left:82%;top:10%}body.tablet-mode .mixer-map .c4{left:85%;top:49.5%}body.tablet-mode .mixer-map .c5{left:23%;top:70%}
@media(max-width:680px){.mixer-map .callout:after{border-bottom-width:8px}}
.tablet-only{display:none}body.tablet-mode .tablet-only{display:block}
@media print{.topbar,.sidebar,.hero-actions,.next{display:none}.layout{display:block}.hero,.chapter{background:#fff!important;color:#111;break-inside:avoid}.lead,.hero p{color:#333}.card,.steps li,.diagram{background:#fff;color:#111;border-color:#aaa}.chapter{padding:30px}.figure{box-shadow:none}.footer{background:#fff;color:#333}}
.chooser-brand{text-decoration:none}