:root{--navy: #13294b;--navy-2: #1f3d70;--orange: #ff5f05;--orange-2: #ff8a3d;--orange-ink: #c24905;--bg: #f4f6fa;--surface: #ffffff;--surface-2: #eef1f6;--text: #17223a;--text-dim: #5d6a82;--border: #e2e7f0;--brand: var(--navy);--accent: var(--orange);--danger: #c0392b;--nav-bg: #13294b;--nav-text: #eaf0fb;--nav-dim: #9fb2d6;--shadow: 0 4px 20px rgba(19, 41, 75, .08);--radius: 12px;--nav-h: 65px}[data-theme=dark]{--bg: #0a1424;--surface: #10203a;--surface-2: #17294a;--text: #e8edf6;--text-dim: #9fb0c8;--border: #24375a;--orange-ink: #ff8a45;--nav-bg: #0c1a30;--nav-text: #eaf0fb;--nav-dim: #93a6c9;--shadow: 0 4px 24px rgba(0, 0, 0, .5)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.55;transition:background .2s ease,color .2s ease}a{color:var(--orange-ink);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.25;color:var(--text);letter-spacing:-.01em}.nav{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:22px;padding:12px 26px;background:var(--nav-bg);border-bottom:3px solid var(--orange)}.nav .brand-lockup{display:flex;align-items:center;gap:11px}.nav .brand-text{display:flex;flex-direction:column;line-height:1.1}.nav .brand-title{font-weight:800;font-size:17px;color:#fff;letter-spacing:-.01em}.nav .brand-sub{font-size:11px;color:var(--nav-dim);font-weight:600;letter-spacing:.02em}.nav .spacer{flex:1}.nav a{color:var(--nav-dim);font-weight:600;font-size:14px;padding:4px 0}.nav a.active,.nav a:hover{color:#fff;text-decoration:none}.nav a.active{box-shadow:inset 0 -2px 0 var(--orange)}.nav-toggle{background:none;border:none;color:var(--nav-dim);cursor:pointer;padding:7px;border-radius:8px;display:inline-flex;align-items:center;margin-right:2px}.nav-toggle:hover{color:#fff;background:#ffffff1f}.container{max-width:940px;margin:0 auto;padding:34px 24px 90px}.container.narrow{max-width:540px}.shell{display:flex;align-items:flex-start}.shell-main{flex:1;min-width:0}.sidebar{width:320px;flex-shrink:0;position:sticky;top:var(--nav-h);height:calc(100vh - var(--nav-h));overflow-y:auto;overflow-x:hidden;background:var(--surface);border-right:1px solid var(--border);padding:16px 16px 28px;transition:width .2s ease,padding .2s ease;scrollbar-gutter:stable;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.sidebar::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar-track{background:transparent}.sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:999px;border:2px solid var(--surface)}.sidebar:hover::-webkit-scrollbar-thumb{background:var(--text-dim)}.sidebar.collapsed{scrollbar-gutter:auto}.sidebar-backdrop{display:none}.sidebar.collapsed{width:0;min-width:0;padding-left:0;padding-right:0;border-right-width:0;pointer-events:none}.sidebar.collapsed>*{opacity:0}.sidebar-progress{padding:8px 8px 16px;border-bottom:1px solid var(--border)}.side-heading{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);padding:18px 10px 8px}.side-link{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px;border-radius:8px;color:var(--text);font-weight:600;font-size:14px;text-decoration:none}.side-link:hover{background:var(--surface-2);text-decoration:none}.side-link.active{background:color-mix(in srgb,var(--orange) 12%,transparent);color:var(--orange-ink);box-shadow:inset 3px 0 0 var(--orange)}.side-modules{display:flex;flex-direction:column;gap:2px}.side-module-group{display:flex;flex-direction:column}.side-module{display:flex;align-items:stretch;border-radius:8px}.side-module:hover{background:var(--surface-2)}.side-module.active{background:color-mix(in srgb,var(--orange) 12%,transparent);box-shadow:inset 3px 0 0 var(--orange)}.side-caret{background:none;border:none;cursor:pointer;color:var(--text-dim);padding:10px 2px 0 8px;display:flex;align-items:flex-start}.side-caret:hover{color:var(--text)}.caret{display:inline-block;font-size:11px;transition:transform .15s ease}.caret.open{transform:rotate(90deg)}.side-module-link{display:flex;gap:10px;align-items:flex-start;flex:1;min-width:0;padding:9px 10px 9px 2px;text-decoration:none;color:var(--text)}.side-module-link:hover{text-decoration:none}.side-num{flex-shrink:0;width:24px;height:24px;border-radius:6px;background:var(--surface-2);color:var(--text-dim);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;margin-top:1px}.side-num.done{background:var(--navy);color:#fff}.side-module.active .side-num:not(.done){background:var(--orange);color:#fff}.side-module-body{display:flex;flex-direction:column;min-width:0;flex:1}.side-module-title{font-size:13.5px;font-weight:600;line-height:1.3}.side-module-meta{font-size:11.5px;color:var(--text-dim);margin-top:2px}.side-module-bar{height:4px;border-radius:999px;background:var(--surface-2);overflow:hidden;margin-top:6px}.side-module-bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--orange),var(--orange-2))}.side-lessons{display:flex;flex-direction:column;margin:2px 0 6px 21px;padding-left:12px;border-left:1px solid var(--border)}.side-lesson{display:flex;align-items:center;gap:9px;padding:7px 10px;border-radius:7px;text-decoration:none;color:var(--text-dim);font-size:13px}.side-lesson:hover{background:var(--surface-2);color:var(--text);text-decoration:none}.side-lesson.active{color:var(--orange-ink);font-weight:700;background:color-mix(in srgb,var(--orange) 10%,transparent)}.side-lesson-dot{flex-shrink:0;width:16px;height:16px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:9px;color:#fff}.side-lesson-dot.done{background:var(--navy);border-color:var(--navy)}.side-lesson-title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.side-lesson.quiz .side-lesson-title{font-weight:600;color:inherit}.side-lesson.locked{cursor:not-allowed;opacity:.5}.side-lesson.locked:hover{background:none;color:var(--text-dim)}.side-tag{font-size:10.5px;font-weight:800;padding:2px 8px;border-radius:999px;text-transform:uppercase;letter-spacing:.03em}.side-tag.ready{background:var(--navy);color:#fff}.side-tag.locked{background:var(--surface-2);color:var(--text-dim)}@media (max-width: 860px){.sidebar{position:fixed;top:var(--nav-h);left:0;z-index:30;width:300px;max-width:84vw;height:calc(100vh - var(--nav-h));border-right:1px solid var(--border);box-shadow:10px 0 40px #00000040;transform:translate(0);transition:transform .22s ease;scrollbar-gutter:auto}.sidebar.collapsed{width:300px;max-width:84vw;padding:16px 16px 28px;border-right-width:1px;transform:translate(-100%);pointer-events:none}.sidebar.collapsed>*{opacity:1}.sidebar-backdrop{display:block;position:fixed;inset:var(--nav-h) 0 0 0;background:#0a142473;z-index:25}}@media (max-width: 560px){.nav{gap:10px;padding:10px 14px}.nav .brand-sub{display:none}.container{padding:22px 16px 72px}h1{font-size:25px}.lesson-body{font-size:15px}.lesson-body table{font-size:13px}.certificate{padding:34px 20px}.certificate h1{font-size:21px}.certificate .recipient{font-size:27px}.certificate .rule{width:200px}.certificate .body-text{font-size:14px}.module-badge{width:38px;height:38px;font-size:17px}}@media (max-width: 430px){.nav .brand-text{display:none}}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:9px;border:1px solid transparent;background:var(--orange);color:#fff;font-weight:700;font-size:14px;cursor:pointer;transition:transform .05s ease,background .15s ease,opacity .15s ease}.btn:hover{background:#e85400;text-decoration:none}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.navy{background:var(--navy)}.btn.navy:hover{background:var(--navy-2)}.btn.ghost{background:transparent;color:var(--text);border-color:var(--border)}.btn.ghost:hover{background:var(--surface-2)}.btn.subtle{background:var(--surface-2);color:var(--text)}.btn.subtle:hover{background:var(--border)}.btn.danger{background:var(--danger)}.btn.danger:hover{background:#a5311f}.btn.block{width:100%}.nav .btn.ghost{color:var(--nav-text);border-color:#ffffff40}.nav .btn.ghost:hover{background:#ffffff1f}.nav .btn.subtle{background:#ffffff1a;color:var(--nav-text)}.nav .btn.subtle:hover{background:#ffffff2e}.input,textarea.input{width:100%;padding:11px 13px;border-radius:9px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-size:14px;font-family:inherit}.input:focus{outline:2px solid var(--orange);outline-offset:0}.input:disabled{opacity:.65}label.field{display:block;margin-bottom:14px}label.field span{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text-dim)}.error{color:var(--danger);font-size:14px;margin:8px 0}.muted{color:var(--text-dim)}.center{text-align:center}.row{display:flex;gap:12px;align-items:center}.wrap{flex-wrap:wrap}.progressbar{height:9px;border-radius:999px;background:var(--surface-2);overflow:hidden}.progressbar>div{height:100%;background:linear-gradient(90deg,var(--orange),var(--orange-2));transition:width .4s ease}.pill{font-size:12px;font-weight:700;padding:3px 11px;border-radius:999px;white-space:nowrap}.pill.done{background:var(--navy);color:#fff}.pill.todo{background:var(--surface-2);color:var(--text-dim)}.pill.progress{background:color-mix(in srgb,var(--orange) 16%,transparent);color:var(--orange-ink)}.module-grid{display:grid;gap:14px}.module-card{display:flex;gap:16px;align-items:flex-start;text-decoration:none;color:inherit}.module-card:hover{text-decoration:none;border-color:var(--orange)}.module-badge{flex-shrink:0;width:44px;height:44px;border-radius:10px;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800}.module-card h3{margin:0 0 4px}.meta-row{display:flex;flex-wrap:wrap;gap:18px;font-size:13px;color:var(--text-dim)}.lesson-body{font-size:16px}.lesson-body h2{margin-top:26px;font-size:20px}.lesson-body a{color:var(--orange-ink)}.lesson-body code{background:var(--surface-2);padding:2px 6px;border-radius:6px;font-size:.9em;font-family:SF Mono,Menlo,Consolas,monospace}.lesson-body pre{background:var(--navy);color:#eaf0fb;padding:16px;border-radius:10px;overflow-x:auto}.lesson-body pre code{background:none;padding:0;color:inherit}.lesson-body table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14px}.lesson-body th,.lesson-body td{border:1px solid var(--border);padding:8px 12px;text-align:left}.lesson-body th{background:var(--surface-2)}.lesson-body blockquote{margin:16px 0;padding:10px 16px;border-left:4px solid var(--orange);background:var(--surface-2);border-radius:0 8px 8px 0}.quiz-option{display:block;width:100%;text-align:left;padding:14px 16px;margin-bottom:10px;border-radius:9px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;font-size:15px;transition:border .1s,background .1s}.quiz-option:hover{border-color:var(--orange)}.quiz-option.selected{border-color:var(--orange);background:color-mix(in srgb,var(--orange) 9%,transparent)}.quiz-option.correct{border-color:#1a8f5f;background:color-mix(in srgb,#1a8f5f 12%,transparent)}.quiz-option.wrong{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 12%,transparent)}.certificate{background:#fff;color:#17223a;border:2px solid var(--navy);border-radius:14px;padding:54px 48px;text-align:center;position:relative;box-shadow:var(--shadow)}.certificate:before{content:"";position:absolute;top:10px;right:10px;bottom:10px;left:10px;border:1px solid var(--orange);border-radius:8px;pointer-events:none}.certificate-watermark{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden;display:flex;flex-direction:column;justify-content:center;gap:34px;transform:rotate(-24deg) scale(1.5);pointer-events:none;-webkit-user-select:none;user-select:none;z-index:0}.certificate-watermark span{white-space:nowrap;text-align:center;text-transform:uppercase;font-size:26px;font-weight:800;letter-spacing:4px;color:var(--navy);opacity:.06}.certificate>*:not(.certificate-watermark){position:relative;z-index:1}.certificate .kicker{letter-spacing:3px;text-transform:uppercase;font-weight:800;color:#c24905;font-size:13px}.certificate h1{font-size:30px;margin:8px 0 2px;color:var(--navy)}.certificate .recipient{font-size:38px;font-weight:800;margin:20px 0 6px;color:var(--navy)}.certificate .rule{width:300px;height:2px;background:var(--orange);margin:6px auto 20px}.certificate .meta{color:#5b667a;font-size:14px}.certificate .body-text{max-width:620px;margin:0 auto;color:#3a4256}@media print{@page{size:landscape;margin:14mm}*{-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important}.nav,.no-print,.sidebar,.sidebar-backdrop,.demo-banner{display:none!important}html,body{background:#fff!important}.shell,.shell-main{display:block!important}.container{max-width:none!important;margin:0!important;padding:0!important;display:flex;align-items:center;justify-content:center;min-height:0}.certificate{box-shadow:none;border-color:var(--navy);width:100%;max-width:1000px;padding:40px 52px;background:#fff!important;color:#17223a!important;page-break-inside:avoid}[data-theme=dark] .certificate{background:#fff!important;color:#17223a!important}}.demo-banner{background:var(--orange);color:#fff;text-align:center;font-size:13px;font-weight:600;padding:7px 16px}.loading{min-height:60vh;display:flex;align-items:center;justify-content:center;color:var(--text-dim)}.divider{height:1px;background:var(--border);margin:20px 0}.footer-note{text-align:center;color:var(--text-dim);font-size:13px;margin-top:40px}