:root,[data-theme=warm]{--bg:#fdf8f1;--surface:#fff;--surface-soft:#f9f0e3;--surface-hover:#f6efe5;--border:#ead9c5;--text:#3a2f2a;--text-muted:#8b7768;--primary:#d97757;--primary-hover:#c4623f;--primary-soft:#f4e3d9;--success:#5a8f6a;--danger:#c1432e;--warning:#d4a73a;--code-bg:#2b2522;--code-text:#f0e7d8;--radius:14px;--radius-sm:10px;--radius-lg:20px;--shadow-sm:0 1px 2px #3a2f2a0a, 0 1px 3px #3a2f2a0f;--shadow:0 2px 6px #3a2f2a0f, 0 4px 12px #3a2f2a0d;--shadow-lg:0 8px 24px #3a2f2a1a, 0 16px 40px #3a2f2a14;--font-display:"Fraunces", Georgia, "Times New Roman", serif;--font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100dvh;line-height:1.55}a{color:var(--primary);border-bottom:1px solid color-mix(in srgb, var(--primary) 30%, transparent);text-decoration:none;transition:border-color .15s}a:hover{border-bottom-color:var(--primary)}h1,h2,h3,h4{font-family:var(--font-display);font-variation-settings:"opsz" 60, "SOFT" 50;letter-spacing:-.01em;color:var(--text);font-weight:600}code{font-family:var(--font-mono);background:var(--surface-soft);border:1px solid var(--border);border-radius:5px;padding:1px 6px;font-size:.88em}pre{background:var(--code-bg);color:var(--code-text);border-radius:var(--radius-sm);font-family:var(--font-mono);margin:16px 0;padding:16px 18px;font-size:13px;line-height:1.5;overflow-x:auto}pre code{color:inherit;font-size:inherit;background:0 0;border:none;padding:0}.pin-gate{background:var(--bg);justify-content:center;align-items:center;min-height:100dvh;padding:24px;display:flex}.pin-gate-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:420px;box-shadow:var(--shadow-lg);text-align:center;padding:36px 32px}.pin-gate-icon{background:var(--primary-soft);width:56px;height:56px;color:var(--primary);border-radius:50%;justify-content:center;align-items:center;margin-bottom:18px;display:inline-flex}.pin-gate-card h1{font-variation-settings:"opsz" 144, "SOFT" 80;margin-bottom:12px;font-size:1.8rem}.pin-gate-lede{color:var(--text-muted);margin-bottom:24px;font-size:14.5px;line-height:1.55}.pin-gate-form{flex-direction:column;gap:12px;margin-bottom:20px;display:flex}.pin-gate-form input{text-align:center;width:100%;font-family:var(--font-mono);letter-spacing:.5em;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);outline:none;padding:14px 12px 14px 26px;font-size:1.6rem;transition:border-color .15s}.pin-gate-form input:focus{border-color:var(--primary)}.pin-gate-form button{background:var(--primary);color:#fff;cursor:pointer;box-shadow:var(--shadow-sm);border:none;border-radius:999px;padding:12px 22px;font-size:15px;font-weight:600;transition:background .15s,transform .1s}.pin-gate-form button:hover:not(:disabled){background:var(--primary-hover)}.pin-gate-form button:active{transform:scale(.98)}.pin-gate-form button:disabled{opacity:.5;cursor:not-allowed}.pin-gate-error{color:var(--danger);margin:-4px 0 0;font-size:13px}.pin-gate-note{color:var(--text-muted);font-size:12.5px;font-style:italic}.layout{flex-direction:column;min-height:100dvh;display:flex}.layout-header{background:var(--surface);border-bottom:1px solid var(--border);z-index:50;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);justify-content:space-between;align-items:center;padding:14px 24px;display:flex;position:sticky;top:0}.brand{font-family:var(--font-display);color:var(--text);border-bottom:none;align-items:center;gap:10px;font-size:1.1rem;font-weight:600;display:inline-flex}.brand em{color:var(--primary);font-style:italic;font-weight:500}.brand-mark{background:var(--primary);color:#fff;border-radius:8px;justify-content:center;align-items:center;width:32px;height:32px;display:inline-flex}.layout-header-actions{align-items:center;gap:10px;display:flex}.header-link{color:var(--text-muted);border-bottom:none;border-radius:999px;align-items:center;gap:4px;padding:6px 10px;font-size:13px;font-weight:500;transition:background .15s,color .15s;display:inline-flex}.header-link:hover{background:var(--surface-hover);color:var(--text)}.nav-toggle{color:var(--text);cursor:pointer;background:0 0;border:none;padding:4px;display:none}.layout-body{flex:1;grid-template-columns:260px 1fr;gap:0;width:100%;max-width:1200px;margin:0 auto;display:grid}.layout-sidebar{border-right:1px solid var(--border);align-self:start;height:calc(100dvh - 65px);padding:28px 20px;position:sticky;top:65px;overflow-y:auto}.sidebar-label{font-family:var(--font-display);letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin-bottom:12px;font-size:12px;font-weight:600}.lesson-nav{flex-direction:column;gap:2px;list-style:none;display:flex}.lesson-nav-link{color:var(--text);border-bottom:none;border-radius:8px;align-items:center;gap:10px;padding:8px 10px;font-size:13.5px;display:flex}.lesson-nav-link:hover{background:var(--surface-hover)}.lesson-nav-link.active{background:var(--primary-soft);color:var(--primary);font-weight:600}.lesson-nav-num{font-family:var(--font-mono);color:var(--text-muted);font-size:11px;font-weight:600}.lesson-nav-link.active .lesson-nav-num{color:var(--primary)}.sidebar-footer{color:var(--text-muted);margin-top:32px;font-size:12px;line-height:1.5}.sidebar-footer a{font-weight:500}.layout-main{max-width:760px;padding:40px 56px 80px}.home-eyebrow{font-family:var(--font-display);color:var(--primary);margin-bottom:14px;font-size:13px;font-style:italic;font-weight:500;display:inline-block}.home-hero h1{font-variation-settings:"opsz" 144, "SOFT" 80;margin-bottom:18px;font-size:clamp(2rem,5vw,3rem);line-height:1.1}.home-lede{color:var(--text-muted);max-width:560px;margin-bottom:28px;font-size:1.05rem}.home-cta{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:56px;display:flex}.home-cta-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-sm);border-bottom:none;border-radius:999px;align-items:center;gap:8px;padding:12px 22px;font-weight:500;transition:background .15s,transform .1s,box-shadow .2s;display:inline-flex}.home-cta-primary:hover{background:var(--primary-hover);box-shadow:var(--shadow)}.home-cta-primary strong{font-weight:700}.home-cta-secondary{color:var(--text);border-bottom:none;border-radius:999px;align-items:center;gap:6px;padding:12px 18px;font-size:14px;display:inline-flex}.home-cta-secondary:hover{background:var(--surface-hover)}.home-pitches{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:56px;display:grid}.home-pitch{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px}.home-pitch-icon{background:var(--primary-soft);width:36px;height:36px;color:var(--primary);border-radius:10px;justify-content:center;align-items:center;margin-bottom:12px;display:inline-flex}.home-pitch h3{margin-bottom:4px;font-size:1rem}.home-pitch p{color:var(--text-muted);font-size:13.5px;line-height:1.5}.home-toc h2{margin-bottom:16px;font-size:1.4rem}.home-lesson-list{flex-direction:column;gap:8px;list-style:none;display:flex}.home-lesson-link{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);border-bottom:1px solid var(--border);align-items:center;gap:18px;padding:14px 16px;transition:border-color .15s,background .15s,transform .1s;display:flex}.home-lesson-link:hover{border-color:var(--primary);transform:translate(2px)}.home-lesson-num{font-family:var(--font-mono);color:var(--primary);font-size:14px;font-weight:700}.home-lesson-meta{flex-direction:column;gap:2px;display:flex}.home-lesson-meta strong{font-size:14.5px;font-weight:600}.home-lesson-meta em{color:var(--text-muted);font-size:13px;font-style:normal}.home-toc-note{color:var(--text-muted);margin-top:20px;font-size:13px;font-style:italic}.lesson-header{margin-bottom:32px}.lesson-pill{font-family:var(--font-mono);letter-spacing:.06em;color:var(--primary);background:var(--primary-soft);text-transform:uppercase;border-radius:999px;margin-bottom:14px;padding:4px 10px;font-size:11px;font-weight:700;display:inline-block}.lesson-header h1{font-variation-settings:"opsz" 144, "SOFT" 80;margin-bottom:10px;font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.1}.lesson-subtitle{color:var(--text-muted);font-size:1.05rem;line-height:1.5}.lesson-body{font-size:16px}.lesson-body p{margin-bottom:16px}.lesson-body p.lead{color:var(--text);margin-bottom:24px;font-size:1.1rem}.lesson-body h2{margin:36px 0 14px;font-size:1.5rem}.lesson-body h3{margin:24px 0 10px;font-size:1.15rem;font-weight:600}.lesson-body ul,.lesson-body ol{margin:0 0 16px 22px}.lesson-body li{margin-bottom:8px}.lesson-body strong{font-weight:600}.lesson-nav-footer{border-top:1px solid var(--border);grid-template-columns:1fr 1fr;gap:16px;margin-top:56px;padding-top:28px;display:grid}.lesson-prev,.lesson-next{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);border-bottom:1px solid var(--border);align-items:center;gap:10px;min-width:0;padding:14px 18px;transition:border-color .15s,transform .1s;display:flex}.lesson-prev:hover,.lesson-next:hover{border-color:var(--primary)}.lesson-next{text-align:right;justify-content:flex-end}.lesson-next:hover{transform:translate(2px)}.lesson-prev:hover{transform:translate(-2px)}.lesson-prev span,.lesson-next span{flex-direction:column;gap:1px;min-width:0;display:flex}.lesson-nav-direction{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;font-size:11px;font-weight:600}.lesson-prev strong,.lesson-next strong{white-space:nowrap;text-overflow:ellipsis;font-size:14px;font-weight:600;overflow:hidden}.arch-stack{flex-direction:column;margin:28px 0;display:flex}.arch-block{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);align-items:flex-start;gap:16px;padding:18px 20px;transition:border-color .15s,transform .1s;display:flex}.arch-block:hover{border-color:var(--primary)}.arch-block h3{margin-bottom:6px;font-size:1.1rem}.arch-block p{color:var(--text);margin:0;font-size:14.5px;line-height:1.55}.arch-block p a{font-weight:500}.arch-block code{font-size:.85em}.arch-num{width:36px;height:36px;font-family:var(--font-mono);color:#fff;background:var(--primary);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:16px;font-weight:700;display:inline-flex}.arch-arrow{color:var(--text-muted);text-align:center;font-size:13px;font-family:var(--font-mono);padding:10px 0}.arch-arrow em{font-family:var(--font-body);margin-left:8px;font-size:12.5px;font-style:italic}.screenshot{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);margin:24px 0;padding:12px}.screenshot img{border-radius:var(--radius-sm);border:1px solid var(--border);max-width:100%;height:auto;display:block}.screenshot figcaption{color:var(--text-muted);margin-top:12px;padding:0 4px;font-size:13.5px;line-height:1.55}.screenshot figcaption code{font-size:.88em}.quiz{background:var(--surface-soft);border:1px solid var(--border);border-radius:var(--radius);margin:40px 0 0;padding:24px}.quiz-header{justify-content:space-between;align-items:center;margin-bottom:18px;display:flex}.quiz-label{font-family:var(--font-display);letter-spacing:.06em;text-transform:uppercase;color:var(--primary);font-size:13px;font-weight:600}.quiz-reset{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:4px;padding:4px 10px;font-size:12px;display:inline-flex}.quiz-reset:hover{color:var(--text);border-color:var(--primary)}.quiz-question{margin-bottom:20px}.quiz-question:last-of-type{margin-bottom:8px}.quiz-prompt{color:var(--text);margin-bottom:12px;font-size:15px;font-weight:500}.quiz-num{color:var(--primary);font-weight:700;font-family:var(--font-mono);margin-right:4px}.quiz-choices{flex-direction:column;gap:6px;margin:0;padding:0;list-style:none;display:flex}.quiz-choices li{margin:0}.quiz-choice{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text);text-align:left;cursor:pointer;align-items:center;gap:10px;padding:10px 14px;font-size:14px;transition:border-color .15s,background .15s;display:flex}.quiz-choice:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft)}.quiz-choice:disabled{opacity:.5;cursor:default}.quiz-choice-letter{font-family:var(--font-mono);background:var(--surface-soft);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;font-size:12px;font-weight:700;display:inline-flex}.quiz-choice-text{flex:1}.quiz-choice.correct{background:color-mix(in srgb, var(--success) 12%, var(--surface));border-color:var(--success);color:var(--success)}.quiz-choice.correct .quiz-choice-letter{background:var(--success);color:#fff}.quiz-choice.wrong{background:color-mix(in srgb, var(--danger) 12%, var(--surface));border-color:var(--danger);color:var(--danger)}.quiz-choice.wrong .quiz-choice-letter{background:var(--danger);color:#fff}.quiz-choice.reveal{background:color-mix(in srgb, var(--success) 8%, var(--surface));border-color:color-mix(in srgb, var(--success) 50%, var(--border));color:var(--success);opacity:.85}.quiz-explanation{color:var(--text-muted);background:var(--surface);border-left:3px solid var(--primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin-top:10px;padding:10px 14px;font-size:13.5px;line-height:1.5}.quiz-summary{background:var(--surface);border-radius:var(--radius-sm);text-align:center;color:var(--text);margin-top:16px;padding:12px 16px;font-size:14px}.quiz-summary strong{color:var(--primary)}@media (width<=800px){.nav-toggle{display:inline-flex}.hide-on-mobile{display:none}.layout-body{grid-template-columns:1fr}.layout-sidebar{z-index:40;background:var(--surface);height:auto;transition:transform .2s ease-out;position:fixed;inset:56px 0 0;transform:translate(-100%)}.layout-sidebar.open{transform:translate(0)}.layout-main{padding:28px 20px 60px}.lesson-nav-footer{grid-template-columns:1fr}.home-cta-primary,.home-cta-secondary{justify-content:center;width:100%}}