:root{--color-bg:#fbf9f4;--color-surface:#fff;--color-text:#1c1b1a;--color-text-muted:#4a4744;--color-border:#e4ddd0;--color-primary:#1f6f5c;--color-primary-dark:#14493d;--color-accent:#c9622a;--color-tip-bg:#eaf4ee;--color-tip-border:#1f6f5c;--color-warning-bg:#fbeee6;--color-warning-border:#c9622a;--color-done:#1f6f5c;--radius:16px;--max-width:880px;--font-body:-apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;margin:0;font-size:19px;line-height:1.65}#root{flex-direction:column;min-height:100vh;display:flex}h1,h2,h3,h4{color:var(--color-primary-dark);font-weight:700;line-height:1.25}h1{font-size:clamp(2rem,5vw,2.75rem)}h2{font-size:clamp(1.5rem,4vw,2rem)}h3{font-size:1.3rem}p{margin:0 0 1em}a{color:var(--color-primary)}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--color-accent);outline-offset:3px}button{font-family:inherit}.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}.site-header{z-index:20;background:var(--color-surface);border-bottom:1px solid var(--color-border);position:sticky;top:0}.site-header__inner{max-width:var(--max-width);justify-content:space-between;align-items:center;gap:16px;margin:0 auto;padding:16px 24px;display:flex}.site-header__brand{flex-direction:column;gap:2px;text-decoration:none;display:flex}.site-header__title{color:var(--color-primary-dark);font-size:1.5rem;font-weight:800}.site-header__subtitle{color:var(--color-text-muted);font-size:.85rem}.site-header__nav{gap:8px;display:flex}.nav-link{color:var(--color-primary-dark);border-radius:999px;align-items:center;min-height:44px;padding:10px 16px;font-weight:600;text-decoration:none;display:flex}.nav-link:hover{background:var(--color-tip-bg)}.btn{cursor:pointer;border:2px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:10px;min-height:52px;padding:14px 28px;font-size:1.05rem;font-weight:700;line-height:1.2;text-decoration:none;display:inline-flex}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-dark)}.btn-secondary{color:var(--color-primary-dark);border-color:var(--color-primary);background:0 0}.btn-secondary:hover{background:var(--color-tip-bg)}.btn-outline{background:var(--color-surface);color:var(--color-text);border-color:var(--color-border)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-block{width:100%}main{flex:1;padding:40px 0 80px}.hero{text-align:center;padding:24px 0 8px}.hero__badge{background:var(--color-tip-bg);color:var(--color-primary-dark);border-radius:999px;margin-bottom:20px;padding:8px 18px;font-size:.9rem;font-weight:700;display:inline-block}.hero__lead{color:var(--color-text-muted);max-width:640px;margin:0 auto 32px;font-size:1.2rem}.hero__actions{flex-wrap:wrap;justify-content:center;gap:16px;margin-bottom:12px;display:flex}.hero__note{color:var(--color-text-muted);font-size:.95rem}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin:56px 0;display:grid}.feature-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:24px}.feature-card h3{margin:0 0 8px;font-size:1.15rem}.feature-card p{color:var(--color-text-muted);margin:0;font-size:.98rem}.progress-track{background:var(--color-border);border-radius:999px;width:100%;height:12px;overflow:hidden}.progress-fill{background:var(--color-primary);border-radius:999px;height:100%}.progress-label{color:var(--color-text-muted);justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:8px;font-size:.95rem;display:flex}.module-block{margin-bottom:44px}.module-block__header{align-items:baseline;gap:12px;margin-bottom:16px;display:flex}.module-block__index{color:var(--color-accent);font-size:1rem;font-weight:800}.lesson-list{flex-direction:column;gap:12px;margin:0;padding:0;list-style:none;display:flex}.lesson-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);color:var(--color-text);align-items:center;gap:16px;padding:16px 20px;text-decoration:none;display:flex}.lesson-card:hover{border-color:var(--color-primary)}.lesson-card__status{border:2px solid var(--color-border);width:34px;height:34px;color:var(--color-text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.95rem;font-weight:700;display:flex}.lesson-card--done .lesson-card__status{background:var(--color-done);border-color:var(--color-done);color:#fff}.lesson-card__body{flex:1;min-width:0}.lesson-card__title{margin-bottom:2px;font-size:1.05rem;font-weight:700;display:block}.lesson-card__meta{color:var(--color-text-muted);font-size:.88rem;display:block}.lesson-card__arrow{color:var(--color-primary);flex-shrink:0;font-size:1.3rem}.breadcrumb{color:var(--color-text-muted);margin-bottom:8px;font-size:.92rem}.lesson-header{margin-bottom:8px}.lesson-meta-row{color:var(--color-text-muted);align-items:center;gap:12px;margin-bottom:28px;font-size:.95rem;display:flex}.content-block{margin-bottom:22px}.content-block p{margin:0 0 1em}.steps-box{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:22px 26px}.steps-box h4{margin:0 0 14px;font-size:1.05rem}.steps-box ol{flex-direction:column;gap:12px;margin:0;padding-left:22px;display:flex}.steps-box li{padding-left:4px}.tip-box,.warning-box,.example-box{border-radius:var(--radius);border:1px solid #0000;padding:20px 24px}.tip-box{background:var(--color-tip-bg);border-color:var(--color-tip-border)}.warning-box{background:var(--color-warning-bg);border-color:var(--color-warning-border)}.callout-label{text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px;font-size:.78rem;font-weight:800;display:block}.tip-box .callout-label{color:var(--color-primary-dark)}.warning-box .callout-label{color:var(--color-accent)}.example-box{background:var(--color-surface);border-color:var(--color-border);flex-direction:column;gap:14px;display:flex}.example-row{border-radius:12px;align-items:flex-start;gap:12px;padding:12px 16px;display:flex}.example-row--bad{background:#fbeee6}.example-row--good{background:#eaf4ee}.example-row__tag{flex-shrink:0;min-width:74px;font-size:.85rem;font-weight:800}.example-row--bad .example-row__tag{color:var(--color-accent)}.example-row--good .example-row__tag{color:var(--color-primary-dark)}.lesson-complete-row{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);flex-wrap:wrap;align-items:center;gap:16px;margin:40px 0;padding:20px 24px;display:flex}.lesson-complete-row p{color:var(--color-text-muted);flex:1;min-width:180px;margin:0}.lesson-nav{flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:32px;display:flex}.lesson-nav__spacer{flex:1}.site-footer{border-top:1px solid var(--color-border);text-align:center;color:var(--color-text-muted);padding:28px 0;font-size:.9rem}.text-center{text-align:center}.mt-0{margin-top:0}@media (width<=640px){.site-header__inner{flex-wrap:wrap}body{font-size:18px}}