:root{--ink:#101828;--muted:#475467;--line:#e4e7ec;--bg:#f2f4f7;--card:#fff;--teal:#0e7569;--teal2:#e6f4f1;--amber:#b54708;--amberbg:#fffaeb;--red:#b42318;--radius:14px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;padding-bottom:0}
a{color:var(--teal);text-decoration:none}a:hover{text-decoration:underline}
.topbar{position:sticky;top:0;z-index:50;background:#0c1f1d;color:#fff;border-bottom:3px solid #f79009}
.topbar-in{max-width:1180px;margin:0 auto;padding:10px 16px;display:flex;gap:12px;align-items:center}
.logo{font-weight:800;letter-spacing:-.02em;color:#fff;font-size:17px;white-space:nowrap}.logo span{color:#fdb022}
.hgi-stroke{font-size:20px;line-height:1;vertical-align:-3px}
.hamburger{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;flex:0 0 auto;background:#1a3532;color:#fff;border:1px solid #2a4a46;border-radius:10px;cursor:pointer;touch-action:manipulation}
.hamburger:hover{background:#24473f}.hamburger .hgi-stroke{font-size:24px}
.top-cta{margin-left:auto;display:inline-flex;align-items:center;gap:7px;background:#f79009;color:#101828!important;font-weight:800;font-size:13.5px;padding:10px 14px;border-radius:10px;min-height:44px;white-space:nowrap}
.top-cta:hover{text-decoration:none;background:#fdb022}
@media(max-width:480px){.top-cta{font-size:12px;padding:9px 10px}}
.overlay{display:none;position:fixed;inset:0;background:rgba(12,31,29,.62);z-index:70;opacity:0;transition:opacity .22s}
.overlay.open{display:block;opacity:1}
.sidebar{position:fixed;top:0;left:0;bottom:0;width:min(330px,88vw);background:#0c1f1d;color:#fff;z-index:80;transform:translateX(-105%);transition:transform .26s ease;display:flex;flex-direction:column;box-shadow:16px 0 40px rgba(0,0,0,.28);visibility:hidden}
.sidebar.open{transform:translateX(0);visibility:visible}
.side-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;padding:20px 18px 14px;border-bottom:1px solid #24473f}
.side-head strong{font-size:20px}.side-head p{margin:2px 0 0;color:#98a2b3;font-size:13px}
.side-close{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;flex:0 0 auto;background:#1a3532;color:#fff;border:1px solid #2a4a46;border-radius:10px;cursor:pointer}
.side-nav{flex:1;overflow-y:auto;padding:10px 12px 18px;-webkit-overflow-scrolling:touch}
.side-group{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#fdb022;font-weight:800;margin:18px 8px 6px}
.side-group:first-child{margin-top:6px}
.slink{display:flex;align-items:center;gap:12px;color:#eaecf0!important;font-weight:600;font-size:15px;padding:12px 10px;border-radius:10px;min-height:48px}
.slink:hover{background:#1a3532;text-decoration:none}
.slink .hgi-stroke{font-size:21px;color:#fdb022;flex:0 0 auto}
.slink span{flex:1}
.slink .slink-arrow{font-size:15px;color:#667085;opacity:0}
.slink:hover .slink-arrow,.slink.active .slink-arrow{opacity:1}
.slink.active{background:#f79009;color:#101828!important}
.slink.active .hgi-stroke{color:#101828}
.side-foot{border-top:1px solid #24473f;padding:16px 18px;color:#d0d5dd;font-size:13.5px}
.side-foot p{color:#98a2b3;margin:4px 0 8px}
body.menu-open{overflow:hidden}
@media(prefers-reduced-motion:reduce){.sidebar,.overlay{transition:none}}
.hero{background:#0c1f1d;color:#fff;padding:36px 20px 30px}
.hero-in{max-width:1180px;margin:0 auto}
.hero h1{font-size:clamp(28px,5vw,42px);line-height:1.08;letter-spacing:-.03em;margin:10px 0 12px;max-width:820px}
.hero p{color:#d0d5dd;max-width:760px;font-size:clamp(15px,2.5vw,17px)}
.pill{display:inline-block;background:#f79009;color:#101828;font-weight:700;font-size:11px;padding:5px 10px;border-radius:999px;letter-spacing:.06em;text-transform:uppercase}
.meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.meta span{background:#1a3532;border:1px solid #2a4a46;color:#eaecf0;padding:6px 10px;border-radius:999px;font-size:12.5px}
.wrap{max-width:1180px;margin:0 auto;padding:24px 16px 60px}
@media(min-width:760px){.wrap{padding:28px 20px 60px}}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(max-width:860px){.grid,.grid2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;content-visibility:auto}
.card h3{margin:0 0 8px;font-size:17px}.card p,.card li{color:var(--muted);font-size:14.5px}
.kicker{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);font-weight:800}
h2{font-size:clamp(21px,3.5vw,26px);letter-spacing:-.02em;margin:34px 0 12px}h2:first-child{margin-top:6px}
/* Responsive tables: scrollable region, sticky header (modern-web-guidance) */
.table-wrapper{overflow:auto;max-inline-size:100%;border:1px solid var(--line);border-radius:12px;background:#fff;margin:12px 0;container-type:inline-size}
.table-wrapper:focus-visible{outline:3px solid var(--teal);outline-offset:2px}
table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;font-size:14px;min-width:560px}
thead th{position:sticky;top:0;z-index:2;background:#f9fafb}
th,td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#f9fafb}
@media(max-width:560px){table{font-size:13px}th,td{padding:9px 10px}}
code,pre{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace}code{background:#eef2f6;padding:2px 6px;border-radius:6px;font-size:.88em;word-break:break-word}
pre{background:#101828;color:#eaecf0;padding:16px;border-radius:12px;overflow:auto;font-size:13px;line-height:1.6;-webkit-overflow-scrolling:touch}
pre code{background:none;color:inherit;padding:0;word-break:normal}
.callout{border-radius:12px;padding:16px 18px;margin:16px 0;font-size:14.5px}
.callout.teal{background:var(--teal2);border:1px solid #a6d8d0}.callout.amber{background:var(--amberbg);border:1px solid #fedf89}
.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--teal);color:#fff!important;padding:12px 16px;border-radius:10px;font-weight:700;font-size:14px;border:0;cursor:pointer;min-height:48px;touch-action:manipulation}
.btn.alt{background:#fff;color:var(--ink)!important;border:1px solid var(--line)}.btn.dark{background:#101828}
.tag{font-size:11px;font-weight:700;padding:3px 8px;border-radius:999px;background:#eef2f6}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:6px 16px;margin:10px 0}
details summary{cursor:pointer;font-weight:700;padding:12px 0;min-height:48px}
details p,details li{color:var(--muted);font-size:14.5px}
.check{list-style:none;padding:0}.check li{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:8px 0;display:flex;gap:10px;align-items:flex-start}
.check input{margin-top:4px;width:20px;height:20px;accent-color:var(--teal);flex:0 0 auto}
.progressbar{height:10px;background:#eaecf0;border-radius:99px;overflow:hidden}.progressbar i{display:block;height:100%;background:var(--teal);width:0%;transition:width .3s}
.flash{background:#0c1f1d;color:#fff;border-radius:14px;padding:22px;min-height:170px;cursor:pointer}
.flash small{color:#fdb022;font-weight:700;letter-spacing:.08em;text-transform:uppercase}
input[type=search],select,textarea{width:100%;padding:12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff;min-height:48px;font-size:16px}
.footer{max-width:1180px;margin:0 auto;padding:24px 20px 40px;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}
.small{font-size:13px;color:var(--muted)}.score{font-size:34px;font-weight:800}
/* Diagrams */
.diagram{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;margin:16px 0;overflow-x:auto;-webkit-overflow-scrolling:touch}
.diagram figcaption{font-size:13px;color:var(--muted);margin-top:10px;text-align:center}
.diagram .mermaid{min-width:520px;text-align:center}
@media(max-width:600px){.diagram .mermaid{min-width:480px}.diagram{padding:12px 8px}}
.diagram svg{max-width:100%;height:auto}
/* Quiz */
.module-quiz{background:#fff;border:2px solid #0c1f1d;border-radius:14px;padding:18px;margin:22px 0}
.module-quiz h2,.module-quiz h3{margin-top:4px}
.quiz{margin:12px 0}
.qbtn{display:block;width:100%;text-align:left;background:#f9fafb;border:1px solid var(--line);padding:13px 14px;border-radius:10px;margin:8px 0;font:inherit;font-size:14.5px;cursor:pointer;min-height:48px;touch-action:manipulation}
.qbtn:hover{border-color:var(--teal)}
.qbtn.correct{background:#027a48!important;color:#fff!important;border-color:#027a48}
.qbtn.wrong{background:#b42318!important;color:#fff!important;border-color:#b42318}
.explain{display:none;background:var(--teal2);border-radius:10px;padding:12px 14px;font-size:14px;margin-top:8px}
.modscore{font-weight:800;font-size:18px}
.pass{background:#ecfdf3;border:1px solid #a6f4c5;border-radius:10px;padding:12px 14px}
.fail{background:#fef3f2;border:1px solid #fecdca;border-radius:10px;padding:12px 14px}
/* Timeline (12h plan) */
.timeline{list-style:none;padding:0}
.timeline li{display:flex;gap:14px;margin:0}
.tl-time{flex:0 0 86px;font-weight:800;font-size:13px;color:var(--teal);padding:16px 0;text-align:right}
.tl-dot{flex:0 0 auto;display:flex;flex-direction:column;align-items:center}
.tl-dot i{width:14px;height:14px;border-radius:50%;background:#f79009;border:3px solid #0c1f1d;margin-top:18px}
.tl-dot b{flex:1;width:2px;background:var(--line)}
.tl-card{flex:1;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:8px 0}
.tl-card h3{margin:0 0 4px;font-size:16px}.tl-card p{margin:0;color:var(--muted);font-size:14px}
@media(max-width:560px){.tl-time{flex-basis:62px;font-size:11.5px}}
.sticky-cta{position:sticky;bottom:16px;z-index:5}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.topbar,.sidebar,.overlay,.no-print{display:none!important}body{background:#fff;padding:0}.card,details,.diagram{break-inside:avoid}}