:root{--bg-dark:#050510;--card:#ffffff08;--input-bg:#ffffff0d;--cyan:#00f3ff;--purple:#bc13fe;--text-main:#fff;--text-dim:#88a;--text-muted:#666;--border:#ffffff14;--accent:#ef4444;--font-main:"Inter", sans-serif;--font-mono:"JetBrains Mono", monospace}[data-theme=light]{--bg-dark:#e8edf5;--card:#fffffff2;--input-bg:#e8eef4;--text-main:#0f172a;--text-dim:#334155;--text-muted:#64748b;--border:#0000001a;--accent:#b91c1c;--cyan:#0e7490;--purple:#7c3aed}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-dark);color:var(--text-main);font-family:var(--font-main);min-height:100vh;transition:background .3s,color .3s}.main-container{max-width:1600px;margin:0 auto;padding:1.5rem 1.5rem 3rem}.calc-title{background:linear-gradient(135deg,#ef4444,#f87171);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:.4rem;font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800}[data-theme=light] .calc-title{background:linear-gradient(135deg,#b91c1c,#dc2626);-webkit-background-clip:text;background-clip:text}.calc-subtitle{color:var(--text-dim);max-width:700px;margin-bottom:1.5rem;font-size:.95rem}.calc-breadcrumb{color:var(--text-muted);max-width:1600px;margin:0 auto;padding:.6rem 1.5rem;font-size:.8rem}.calc-breadcrumb a{color:var(--text-muted);text-decoration:none}.calc-breadcrumb a:hover{color:var(--accent)}.tab-nav{border-bottom:1px solid var(--border);gap:0;margin-bottom:1.5rem;display:flex;overflow-x:auto}.tab-btn{color:var(--text-dim);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;padding:.75rem 1.25rem;font-size:.875rem;font-weight:600;transition:color .2s,border-color .2s}.tab-btn:hover{color:var(--text-main)}.tab-btn.active{color:var(--accent);border-bottom-color:var(--accent)}.tab-content{display:none}.tab-content.active{display:block}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:1rem;padding:1.25rem}[data-theme=light] .card{background:#fff;border-color:#0000001a;box-shadow:0 2px 12px #00000012}.input-card{border-left:3px solid var(--cyan)}.hero-result{border-left:3px solid var(--accent)!important}[data-theme=light] .input-card{border-left-color:#0e7490}.calc-layout{grid-template-columns:1fr 1.4fr;align-items:start;gap:1.25rem;display:grid}@media (width<=900px){.calc-layout{grid-template-columns:minmax(0,1fr);overflow:hidden}}.result-panel{flex-direction:column;gap:1rem;display:flex}.section-title{letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin-bottom:1rem;font-size:.8rem;font-weight:700}.form-group{margin-bottom:1rem}.form-label{color:var(--text-dim);justify-content:space-between;align-items:center;margin-bottom:.4rem;font-size:.8rem;font-weight:600;display:flex}.form-input{background:var(--input-bg);border:1px solid var(--border);width:100%;color:var(--text-main);font-size:.95rem;font-family:var(--font-main);border-radius:8px;outline:none;padding:.6rem .75rem;transition:border-color .2s}.form-input:focus{border-color:var(--accent)}.form-input::placeholder{color:var(--text-muted)}[data-theme=light] .form-input{color:#0f172a;background:#f0f4f9;border-color:#00000026}[data-theme=light] .form-input::placeholder{color:#0006}.solve-toggle-wrap{border:1px solid var(--border);border-radius:8px;display:flex;overflow:hidden}.solve-btn{border:none;border-right:1px solid var(--border);color:var(--text-dim);cursor:pointer;font-size:.8rem;font-weight:600;font-family:var(--font-main);background:0 0;flex:1;padding:.5rem .75rem;transition:all .2s}.solve-btn:last-child{border-right:none}.solve-btn:hover{color:var(--text-main);background:var(--input-bg)}.solve-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}[data-theme=light] .solve-toggle-wrap{border-color:#00000026}[data-theme=light] .solve-btn{color:#334155;border-color:#00000026}[data-theme=light] .solve-btn.active{color:#fff;background:#b91c1c;border-color:#b91c1c}.speed-input-row{align-items:center;gap:.5rem;display:flex}.speed-input-row .form-input{flex:1}.shape-chips{flex-wrap:wrap;gap:.5rem;margin-bottom:1rem;display:flex}.shape-chip{background:var(--input-bg);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;user-select:none;border-radius:20px;padding:.35rem .85rem;font-size:.8rem;font-weight:600;transition:all .2s}.shape-chip:hover{border-color:var(--accent);color:var(--text-main)}.shape-chip.active{background:var(--accent);border-color:var(--accent);color:#fff}[data-theme=light] .shape-chip{color:#334155;background:#f0f4f9;border-color:#00000026}[data-theme=light] .shape-chip.active{color:#fff;background:#b91c1c;border-color:#b91c1c}.cond-chips{grid-template-columns:repeat(5,1fr);gap:.5rem;margin-bottom:1rem;display:grid}@media (width<=500px){.cond-chips{grid-template-columns:repeat(3,1fr)}}.cond-chip{background:var(--input-bg);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;text-align:center;user-select:none;border-radius:10px;padding:.5rem .25rem;font-size:.78rem;font-weight:600;transition:all .2s}.cond-icon{margin-bottom:.2rem;font-size:1.2rem;display:block}.cond-name{font-size:.72rem}.cond-chip:hover{border-color:var(--accent)}.cond-chip.active{border-color:var(--accent);color:var(--text-main);background:#ef444426}[data-theme=light] .cond-chip{background:#f0f4f9;border-color:#00000026}[data-theme=light] .cond-chip.active{color:#0f172a;background:#b91c1c1a;border-color:#b91c1c}.range-slider{width:100%;accent-color:var(--accent);cursor:pointer}.slider-labels{color:var(--text-muted);justify-content:space-between;margin-top:.2rem;font-size:.72rem;display:flex}.grade-row{align-items:center;gap:.5rem;display:flex}.grade-row .form-input{width:80px}.grade-pct{color:var(--text-dim);font-size:.9rem;font-weight:600}.grade-note{color:var(--text-muted);margin-top:.25rem;font-size:.72rem}.toggle-switch{width:42px;height:22px;display:inline-block;position:relative}.toggle-switch input{opacity:0;width:0;height:0}.toggle-slider{cursor:pointer;background:#ffffff1a;border-radius:22px;transition:all .2s;position:absolute;inset:0}.toggle-slider:before{content:"";background:var(--text-muted);border-radius:50%;width:16px;height:16px;transition:all .2s;position:absolute;bottom:3px;left:3px}input:checked+.toggle-slider{background:var(--accent)}input:checked+.toggle-slider:before{background:#fff;transform:translate(20px)}[data-theme=light] .toggle-slider{background:#00000026}.hero-result{text-align:center;background:linear-gradient(135deg,#ef444414,#f59e0b0a);border:1px solid #ef444433;border-radius:14px;padding:1.25rem}[data-theme=light] .hero-result{background:linear-gradient(135deg,#b91c1c0f,#b453090a);border-color:#b91c1c33}.hero-label{text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:.4rem;font-size:.75rem;font-weight:700}.hero-value{font-size:3rem;font-weight:800;font-family:var(--font-mono);color:var(--accent);line-height:1}.hero-sub{color:var(--text-dim);margin-top:.4rem;font-size:.85rem}.danger-level{text-transform:uppercase;letter-spacing:.06em;border-radius:20px;margin-top:.6rem;padding:.25rem .85rem;font-size:.75rem;font-weight:700;display:inline-block}.danger-ok{color:#34d399;background:#10b98126;border:1px solid #10b9814d}.danger-warn{color:#fbbf24;background:#f59e0b26;border:1px solid #f59e0b4d}.danger-high{color:#f87171;background:#ef444426;border:1px solid #ef44444d}.danger-extreme{color:#ef4444;background:#ef444440;border:1px solid #ef444480}[data-theme=light] .danger-ok{color:#065f46;background:#10b9811f}[data-theme=light] .danger-warn{color:#92400e;background:#f59e0b1f}[data-theme=light] .danger-high{color:#991b1b;background:#ef44441a}[data-theme=light] .danger-extreme{color:#7f1d1d;background:#ef444426}.road-viz-wrap{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:.75rem .75rem .5rem}[data-theme=light] .road-viz-wrap{background:#fff;border-color:#0000001a;box-shadow:0 1px 6px #0000000f}.road-svg{width:100%;height:auto;max-height:96px;display:block}.context-strip{grid-template-columns:repeat(4,1fr);gap:.5rem;display:grid}@media (width<=600px){.context-strip{grid-template-columns:repeat(2,1fr)}}.ctx-card{background:var(--input-bg);border:1px solid var(--border);text-align:center;border-radius:10px;padding:.65rem .5rem}[data-theme=light] .ctx-card{background:#edf2f9;border-color:#0000001a}.ctx-icon{margin-bottom:.15rem;font-size:1.2rem;line-height:1}.ctx-val{font-size:.95rem;font-weight:800;font-family:var(--font-mono);color:var(--accent)}.ctx-label{color:var(--text-muted);margin-top:.1rem;font-size:.66rem}[data-theme=light] .ctx-val{color:#b91c1c}[data-theme=light] .ctx-label{color:#64748b}.distance-breakdown{padding:1rem}.db-label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.75rem;font-size:.75rem;font-weight:700}.db-bar-wrap{background:#ffffff0a;border-radius:6px;height:20px;display:flex;overflow:hidden}[data-theme=light] .db-bar-wrap{background:#edf2f9}.db-reaction-bar{background:#f59e0b;transition:width .4s}.db-braking-bar{background:#ef4444;transition:width .4s}.db-legend{color:var(--text-dim);gap:1.25rem;margin-top:.6rem;font-size:.78rem;display:flex}.db-leg-item{align-items:center;gap:.4rem;display:flex}.db-dot{border-radius:50%;flex-shrink:0;width:10px;height:10px;display:inline-block}.db-dot-reaction{background:#f59e0b}.db-dot-braking{background:#ef4444}.stat-grid{grid-template-columns:repeat(3,1fr);gap:.65rem;display:grid}@media (width<=600px){.stat-grid{grid-template-columns:repeat(2,1fr)}}.stat-card{background:var(--input-bg);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:10px;padding:.75rem}[data-theme=light] .stat-card{border-color:#0000001a;border-left-color:var(--accent);background:#edf2f9}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;font-size:.72rem}.stat-value{font-size:1rem;font-weight:700;font-family:var(--font-mono);color:var(--text-main);margin-top:.25rem}[data-theme=light] .stat-label{color:#64748b}[data-theme=light] .stat-value{color:#0f172a}.formula-strip{flex-wrap:wrap;gap:.5rem;display:flex}.formula-pill{color:var(--accent);font-family:var(--font-mono);background:#ef44441a;border:1px solid #ef44444d;border-radius:6px;padding:.3rem .65rem;font-size:.72rem}[data-theme=light] .formula-pill{color:#b91c1c;background:#b91c1c14;border-color:#b91c1c40}.cond-compare{padding:1rem}.cc-title{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.75rem;font-size:.75rem;font-weight:700}.cc-row{align-items:center;gap:.75rem;margin-bottom:.5rem;display:flex}.cc-label{color:var(--text-dim);flex-shrink:0;width:55px;font-size:.78rem}.cc-bar-wrap{background:#ffffff0d;border-radius:4px;flex:1;height:14px;overflow:hidden}[data-theme=light] .cc-bar-wrap{background:#edf2f9}.cc-bar{border-radius:4px;height:100%;transition:width .5s}.cc-val{font-size:.75rem;font-family:var(--font-mono);color:var(--text-main);text-align:right;flex-shrink:0;width:55px}[data-theme=light] .cc-val{color:#0f172a}[data-theme=light] .cc-label{color:#334155}.alert-box{color:var(--text-dim);background:#ef444414;border:1px solid #ef444440;border-radius:10px;padding:.75rem 1rem;font-size:.83rem;line-height:1.6}[data-theme=light] .alert-box{color:#7f1d1d;background:#fff1f2;border-color:#b91c1c33}.action-bar{flex-wrap:wrap;gap:.5rem;display:flex}.action-btn{background:var(--input-bg);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;border-radius:8px;padding:.5rem 1rem;font-size:.8rem;font-weight:600;transition:all .2s}.action-btn:hover{border-color:var(--accent);color:var(--text-main)}[data-theme=light] .action-btn{color:#334155;background:#f0f4f9;border-color:#00000026}.inner-tab-nav{border-bottom:1px solid var(--border);gap:4px;margin-bottom:1rem;display:flex;overflow-x:auto}.inner-tab-btn{color:var(--text-dim);cursor:pointer;font-family:var(--font-main);white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:.45rem 1rem;font-size:.82rem;font-weight:500;transition:all .2s}.inner-tab-btn:hover{color:var(--text-main)}.inner-tab-btn.active{border-bottom-color:var(--accent);color:var(--accent);font-weight:700}.inner-panel{display:none}.inner-panel.active{display:block}[data-theme=light] .inner-tab-btn{color:#64748b}[data-theme=light] .inner-tab-btn.active{color:#b91c1c;border-bottom-color:#b91c1c}.data-table{border-collapse:collapse;width:100%;font-size:.83rem}.data-table th{color:var(--accent);letter-spacing:.06em;text-align:left;text-transform:uppercase;background:#ef444414;padding:.6rem .75rem;font-size:.72rem;font-weight:700}.data-table td{border-bottom:1px solid var(--border);color:var(--text-dim);font-family:var(--font-mono);padding:.55rem .75rem}.data-table td:first-child{font-family:var(--font-main);color:var(--text-main);font-weight:600}.data-table tr:hover td{background:#ffffff05}.data-table tr.rt-highlight-row td{color:var(--text-main);background:#ef44441f;font-weight:700}[data-theme=light] .data-table th{color:#b91c1c;background:#b91c1c12}[data-theme=light] .data-table td{color:#334155;border-color:#00000012}[data-theme=light] .data-table tr:hover td{background:#f0f4f9}[data-theme=light] .data-table td:first-child{color:#0f172a}[data-theme=light] .data-table tr.rt-highlight-row td{color:#0f172a;background:#b91c1c14}.scenario-cards-sd{grid-template-columns:repeat(3,1fr);gap:.75rem;display:grid}@media (width<=700px){.scenario-cards-sd{grid-template-columns:minmax(0,1fr);overflow:hidden}}.scard{background:var(--input-bg);border:1px solid var(--border);border-radius:12px;padding:1.25rem 1rem 1rem;transition:transform .15s;position:relative}.scard:hover{transform:translateY(-2px)}.scard--conservative{border-color:#10b98166}.scard--typical{border-color:#f59e0b66}.scard--worst{border-color:#ef444466}[data-theme=light] .scard{background:#fff;border-color:#0000001a;box-shadow:0 2px 8px #00000012}[data-theme=light] .scard--conservative{border-color:#10b98166}[data-theme=light] .scard--typical{border-color:#f59e0b66}[data-theme=light] .scard--worst{border-color:#ef444459}.scard-badge{color:#fff;letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;border-radius:20px;padding:3px 10px;font-size:.62rem;font-weight:700;position:absolute;top:-10px;left:14px}.scard-label{color:var(--text-main);margin-top:.3rem;margin-bottom:.2rem;font-size:.85rem;font-weight:700}.scard-desc{color:var(--text-muted);margin-bottom:.75rem;font-size:.71rem;line-height:1.5}.scard-value{font-size:1.5rem;font-weight:800;font-family:var(--font-mono);color:var(--text-main)}.scard-delta{margin-top:.2rem;font-size:.78rem;font-weight:600}[data-theme=light] .scard-label,[data-theme=light] .scard-value{color:#0f172a}[data-theme=light] .scard-desc{color:#64748b}.sm-table{border-collapse:collapse;width:100%;font-size:.78rem}.sm-table th{color:var(--accent);letter-spacing:.05em;text-align:center;text-transform:uppercase;background:#ef444414;padding:.5rem .6rem;font-size:.7rem;font-weight:700}.sm-table th:first-child{text-align:left}.sm-speed-label{font-family:var(--font-main);color:var(--text-main);white-space:nowrap;background:var(--input-bg);padding:.45rem .6rem;font-weight:700}.sm-cur-label{color:var(--accent)!important}.sm-cell{font-family:var(--font-mono);text-align:center;padding:.45rem .6rem;font-size:.77rem;font-weight:600}.sm-cell-current{outline:2px solid var(--accent);outline-offset:-2px;font-weight:800!important}[data-theme=light] .sm-table th{color:#b91c1c;background:#b91c1c12}[data-theme=light] .sm-speed-label{color:#0f172a;background:#f0f4f9}[data-theme=light] .sm-cur-label{color:#b91c1c!important}.follow-cards{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.75rem;display:grid}.follow-card{background:var(--input-bg);border:1px solid var(--border);border-radius:12px;padding:.875rem}[data-theme=light] .follow-card{background:#edf2f9;border-color:#0000001a}.follow-cond{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.35rem;font-size:.72rem;font-weight:700}.follow-seconds{font-size:1.4rem;font-weight:800;font-family:var(--font-mono);color:var(--accent)}.follow-feet{color:var(--text-dim);margin-top:.2rem;font-size:.78rem}[data-theme=light] .follow-seconds{color:#b91c1c}[data-theme=light] .follow-cond{color:#64748b}[data-theme=light] .follow-feet{color:#334155}.speed-ctx-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.75rem;display:grid}.speed-ctx-card{background:var(--input-bg);border:1px solid var(--border);border-radius:12px;padding:.875rem}[data-theme=light] .speed-ctx-card{background:#edf2f9;border-color:#0000001a}.sc-zone{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);font-size:.72rem;font-weight:700}.sc-speed{font-size:1.3rem;font-weight:800;font-family:var(--font-mono);color:var(--text-main);margin:.25rem 0}.sc-stop{color:var(--accent);font-size:.8rem;font-weight:600}.sc-note{color:var(--text-muted);margin-top:.2rem;font-size:.72rem}[data-theme=light] .sc-speed{color:#0f172a}[data-theme=light] .sc-stop{color:#b91c1c}[data-theme=light] .sc-zone{color:#64748b}.rt-table{border-collapse:collapse;width:100%;font-size:.82rem}.rt-table th{color:var(--accent);text-align:left;text-transform:uppercase;background:#ef444414;padding:.5rem .75rem;font-size:.72rem;font-weight:700}.rt-table td{border-bottom:1px solid var(--border);color:var(--text-dim);padding:.5rem .75rem}.rt-table td:first-child{color:var(--text-main);font-weight:600}[data-theme=light] .rt-table th{color:#b91c1c;background:#b91c1c12}[data-theme=light] .rt-table td{color:#334155;border-color:#00000012}[data-theme=light] .rt-table td:first-child{color:#0f172a}.page-sections-outer{max-width:1600px;margin:0 auto;padding:0 1.5rem 3rem}.section-heading{color:var(--text-main);margin-bottom:1.25rem;font-size:1.35rem;font-weight:800}[data-theme=light] .section-heading{color:#0f172a}.how-section{margin-bottom:3rem}.how-steps{flex-direction:column;gap:1rem;display:flex}.how-step{background:var(--card);border:1px solid var(--border);border-radius:12px;align-items:flex-start;gap:1rem;padding:1rem;display:flex}[data-theme=light] .how-step{background:#fff;border-color:#0000001a;box-shadow:0 1px 4px #0000000f}.step-num{background:var(--accent);color:#fff;text-align:center;border-radius:50%;flex-shrink:0;width:32px;height:32px;font-size:.85rem;font-weight:800;line-height:32px}.step-body h3{margin-bottom:.25rem;font-size:.9rem;font-weight:700}.step-body p{color:var(--text-dim);font-size:.83rem;line-height:1.6}[data-theme=light] .step-body h3{color:#0f172a}[data-theme=light] .step-body p{color:#334155}.formula-pills2{margin-bottom:3rem}.pills-wrap{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.75rem;display:grid}.pill-card{background:var(--card);border:1px solid #ef444433;border-radius:12px;padding:1rem}[data-theme=light] .pill-card{background:#fff;border-color:#b91c1c33;box-shadow:0 1px 4px #0000000f}.pill-name{text-transform:uppercase;letter-spacing:.06em;color:var(--accent);margin-bottom:.4rem;font-size:.72rem;font-weight:700}.pill-formula{font-family:var(--font-mono);color:var(--text-main);margin-bottom:.35rem;font-size:.85rem}.pill-desc{color:var(--text-muted);font-size:.75rem;line-height:1.5}[data-theme=light] .pill-name{color:#b91c1c}[data-theme=light] .pill-formula{color:#0f172a}[data-theme=light] .pill-desc{color:#64748b}.gloss-section2{margin-bottom:3rem}.gloss-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:.75rem;display:grid}.gloss-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem}[data-theme=light] .gloss-item{background:#fff;border-color:#0000001a;box-shadow:0 1px 4px #0000000f}.gloss-item h4{color:var(--accent);margin-bottom:.35rem;font-size:.85rem;font-weight:700}.gloss-item p{color:var(--text-dim);font-size:.8rem;line-height:1.6}[data-theme=light] .gloss-item h4{color:#b91c1c}[data-theme=light] .gloss-item p{color:#334155}.ex-section2{margin-bottom:3rem}.ex-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:.75rem;display:grid}.ex-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem}[data-theme=light] .ex-card{background:#fff;border-color:#0000001a;box-shadow:0 1px 4px #0000000f}.ex-title{color:var(--accent);margin-bottom:.4rem;font-size:.9rem;font-weight:700}.ex-body{color:var(--text-dim);font-size:.8rem;line-height:1.65}[data-theme=light] .ex-title{color:#b91c1c}[data-theme=light] .ex-body{color:#334155}.calc-article{max-width:860px;margin-bottom:3rem}.calc-article h2{color:var(--text-main);margin-bottom:1rem;font-size:1.25rem;font-weight:800}.calc-article h3{color:var(--accent);margin:1.25rem 0 .5rem;font-size:1rem;font-weight:700}.calc-article p{color:var(--text-dim);margin-bottom:.75rem;font-size:.875rem;line-height:1.8}[data-theme=light] .calc-article h2{color:#0f172a}[data-theme=light] .calc-article h3{color:#b91c1c}[data-theme=light] .calc-article p{color:#334155}.faq-section{margin-bottom:3rem}.faq-list{flex-direction:column;display:flex}.faq-item{border-bottom:1px solid #ffffff0f}.faq-item__question{cursor:pointer;color:var(--text-main);user-select:none;justify-content:space-between;align-items:center;padding:14px 4px;font-size:.9rem;font-weight:600;list-style:none;transition:color .2s;display:flex}.faq-item__question::-webkit-details-marker{display:none}.faq-item__question:after{content:"+";color:var(--text-dim);flex-shrink:0;margin-left:16px;font-size:1.1rem;transition:color .2s}.faq-item[open] .faq-item__question:after{content:"−";color:var(--accent)}.faq-item__question:hover{color:var(--cyan)}.faq-item__answer{color:var(--text-dim);padding:0 4px 14px;font-size:.85rem;line-height:1.75}[data-theme=light] .faq-list{gap:8px}[data-theme=light] .faq-item{background:#fff;border:1px solid #0000001a;border-radius:10px;overflow:hidden;box-shadow:0 1px 4px #0000000f}[data-theme=light] .faq-item[open]{border-color:#b91c1c66 #b91c1c66 #b91c1c66 #b91c1c;border-left-style:solid;border-left-width:3px}[data-theme=light] .faq-item__question{color:#0f172a;padding:14px 16px}[data-theme=light] .faq-item__question:hover{color:#0e7490}[data-theme=light] .faq-item__answer{color:#475569;border-top:1px solid #0000000f;padding:12px 16px 16px}.calc-related{margin-bottom:3rem}.related-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.75rem;display:grid}.related-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem;text-decoration:none;transition:border-color .2s,transform .15s;display:block}.related-card:hover{border-color:var(--accent);transform:translateY(-2px)}[data-theme=light] .related-card{background:#fff;border-color:#0000001a;box-shadow:0 1px 4px #0000000f}.related-icon{margin-bottom:.4rem;font-size:1.5rem;display:block}.related-name{color:var(--text-main);margin-bottom:.25rem;font-size:.85rem;font-weight:700}.related-desc{color:var(--text-muted);font-size:.75rem;line-height:1.5}[data-theme=light] .related-name{color:#0f172a}[data-theme=light] .related-desc{color:#64748b}#toast-container{z-index:9999;flex-direction:column;gap:.5rem;display:flex;position:fixed;bottom:1.5rem;right:1.5rem}.toast{border:1px solid var(--border);color:var(--text-main);background:#0f0f1ef2;border-radius:10px;max-width:320px;padding:.75rem 1rem;font-size:.83rem;animation:.3s toastIn}[data-theme=light] .toast{color:#0f172a;background:#fff;box-shadow:0 4px 12px #0000001f}.toast-success{border-left:3px solid #10b981}.toast-warn{border-left:3px solid #f59e0b}.toast-error{border-left:3px solid #ef4444}@keyframes toastIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}#backToTop{background:var(--accent);color:#fff;cursor:pointer;opacity:0;pointer-events:none;z-index:998;border:none;border-radius:50%;width:42px;height:42px;font-size:1.1rem;font-weight:700;transition:opacity .3s;position:fixed;bottom:1.5rem;right:5rem}#backToTop.visible{opacity:1;pointer-events:auto}.skip-link{background:var(--accent);color:#fff;border-radius:6px;padding:.5rem 1rem;font-weight:700;position:absolute;left:-9999px}.skip-link:focus{z-index:9999;top:1rem;left:1rem}