*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}:root{--blue:#1a73e8;--blue-dark:#1557b0;--blue-light:#e8f0fe;--green:#34a853;--green-dark:#1e7e34;--red:#ea4335;--bg:#ffffff;--bg-alt:#f8f9fa;--bg-card:#ffffff;--text:#202124;--text-muted:#5f6368;--border:#dadce0;--shadow:0 1px 3px rgba(0,0,0,.12), 0 2px 6px rgba(0,0,0,.08);--shadow-md:0 4px 12px rgba(0,0,0,.12);--radius:8px;--radius-lg:12px;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--max-width:900px;--transition:.2s ease}html{scroll-behavior:smooth}body{font-family:var(--font);font-size:16px;line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto;display:block}.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}.site-header{background:var(--bg);border-bottom:1px solid 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var(--transition);color:var(--text)}.sr-item:last-child{border-bottom:none}.sr-item:hover{background:var(--blue-light)}.sr-num{font-size:.8rem;font-weight:700;color:var(--blue)}.sr-name{font-size:.9rem}.sr-empty{color:var(--text-muted);font-size:.9rem;text-align:center}.sections-grid,.popular-section,.about-section{padding:56px 0}.sections-grid{background:var(--bg-alt)}.sections-grid h2,.popular-section h2,.about-section h2{font-size:1.7rem;font-weight:700;margin-bottom:8px;color:var(--text);letter-spacing:-.02em}.section-lead{color:var(--text-muted);margin-bottom:32px}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-top:28px}.section-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;text-decoration:none;color:var(--text);transition:box-shadow var(--transition),transform var(--transition),border-color var(--transition)}.section-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:var(--blue);text-decoration:none}.card-highlight{border-color:var(--green)}.card-icon{font-size:2rem;margin-bottom:10px}.section-card h3{font-size:1rem;font-weight:700;margin-bottom:8px;color:var(--blue)}.section-card p{font-size:.875rem;color:var(--text-muted);flex:1;line-height:1.5}.card-count{margin-top:12px;font-size:.8rem;font-weight:600;color:var(--green)}.popular-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:24px}.popular-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;text-decoration:none;color:var(--text);transition:box-shadow var(--transition),border-color 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12px;border-radius:20px;font-size:.8rem;font-weight:700}.badge-active{background:#e6f4ea;color:#1e8e3e;border:1px solid #a8d5b5}.badge-inactive{background:#fce8e6;color:#c62828;border:1px solid #f5c6c2}.gost-infobox{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:24px}.info-table{width:100%;border-collapse:collapse}.info-table th,.info-table td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:.9rem}.info-table tr:last-child th,.info-table tr:last-child td{border-bottom:none}.info-table th{width:40%;font-weight:600;color:var(--text-muted);background:var(--bg-alt)}.info-table td{background:#fff}.gost-actions{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px}.prose{max-width:720px}.prose h2{font-size:1.3rem;font-weight:700;margin:32px 0 12px;color:var(--text)}.prose h3{font-size:1.1rem;font-weight:700;margin:24px 0 10px}.prose p{margin-bottom:14px}.prose ul,.prose ol{margin:0 0 14px 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h2{font-size:1.2rem;font-weight:700;margin-bottom:16px}.related-list{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}.related-list a{display:flex;flex-direction:column;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;transition:border-color var(--transition),box-shadow var(--transition)}.related-list a:hover{border-color:var(--blue);box-shadow:var(--shadow);text-decoration:none}.related-list .gost-num{font-size:.8rem;font-weight:700;color:var(--blue)}.related-list .gost-title{font-size:.875rem;color:var(--text)}.section-header{margin-bottom:28px}.section-header h1{font-size:clamp(1.4rem,3.5vw,2rem);font-weight:800;letter-spacing:-.02em}.section-description{color:var(--text-muted);margin-top:10px;font-size:1.05rem}.gost-list-section{margin-top:40px}.gost-list-section 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transparent}.calc-tab:hover{background:var(--blue-light);color:var(--blue)}.calc-tab.active{background:#fff;color:var(--blue);border-color:var(--border);border-bottom-color:#fff;font-weight:700}.calc-panel{display:none}.calc-panel.active{display:block}.calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-bottom:16px}.calc-field{display:flex;flex-direction:column;gap:6px}.calc-field label{font-size:.85rem;font-weight:600;color:var(--text)}.calc-field input,.calc-field select{padding:10px 12px;border:1.5px solid var(--border);border-radius:6px;font-size:.95rem;font-family:var(--font);background:#fff;transition:border-color var(--transition)}.calc-field input:focus,.calc-field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,115,232,.12)}.calc-btn{margin-top:4px}.calc-result{margin-top:20px;padding:20px;background:#fff;border:2px solid var(--green);border-radius:var(--radius)}.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:14px;margin-bottom:12px}.result-item{display:flex;flex-direction:column;align-items:center;background:var(--bg-alt);border-radius:var(--radius);padding:12px;text-align:center;border:1px solid var(--border)}.result-item.highlight{background:#e6f4ea;border-color:var(--green)}.result-label{font-size:.78rem;color:var(--text-muted);margin-bottom:4px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.result-value{font-size:1.5rem;font-weight:800;color:var(--green);line-height:1.2}.result-item.highlight .result-value{font-size:1.9rem}.result-unit{font-size:.8rem;color:var(--text-muted);margin-top:2px}.calc-formula{font-size:.8rem;color:var(--text-muted);font-style:italic;margin-top:8px;border-top:1px solid var(--border);padding-top:8px}.calc-note{font-size:.875rem;color:var(--text-muted);margin-bottom:16px;background:#fff8e1;border-left:3px solid #f9ab00;padding:10px 14px;border-radius:0 6px 6px 0}.calc-error{margin-top:12px;padding:12px 16px;background:#fce8e6;border:1px solid #f5c6c2;border-radius:6px;color:var(--red);font-size:.9rem}.search-page h1{margin-bottom:24px}.search-wrapper{margin-bottom:32px}.search-input-large{width:100%;padding:14px 20px;font-size:1.1rem;border:2px solid var(--border);border-radius:10px;font-family:var(--font);background:#fff;transition:border-color var(--transition),box-shadow var(--transition)}.search-input-large:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(26,115,232,.12)}.search-hint{display:block;margin-top:8px;font-size:.85rem;color:var(--text-muted)}.search-results{margin-bottom:40px}.search-count{font-size:.9rem;color:var(--text-muted);margin-bottom:16px}.search-list{list-style:none}.search-item{padding:16px 0;border-bottom:1px solid var(--border)}.search-title{font-size:1.05rem;font-weight:600;color:var(--blue)}.search-title:hover{text-decoration:underline}.search-desc{font-size:.875rem;color:var(--text-muted);margin-top:4px}.search-desc mark,.search-title mark{background:#fbf5cc;padding:0 2px;border-radius:2px}.search-noresult,.search-loading,.search-error,.search-more{color:var(--text-muted);font-size:.9rem;padding:12px 0}.search-error{color:var(--red)}@media(max-width:768px){.nav-toggle{display:flex}.main-nav{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);box-shadow:0 4px 12px rgba(0,0,0,.1);margin-left:0}.main-nav.open{display:block}.main-nav ul{flex-direction:column;padding:8px 0;gap:0}.main-nav a{padding:10px 20px;border-radius:0}.header-inner{position:relative}.hero{padding:40px 0 36px}.cards-grid{grid-template-columns:1fr 1fr}.popular-grid{grid-template-columns:1fr}.gost-actions{flex-direction:column}.gost-actions .btn{justify-content:center}.info-table th{width:38%}.footer-grid{grid-template-columns:1fr 1fr}.related-list{grid-template-columns:1fr}.links-cell{flex-direction:column}}@media(max-width:480px){.cards-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.hero h1{font-size:1.4rem}}