:root{--bg:#f6f8fb;--surface:#fff;--surface2:#eef3f8;--text:#10233c;--muted:#53657a;--border:#d8e1eb;--accent:#155eef;--accent2:#0e4fd1;--ok:#137a4a;--warn:#9a6700;--danger:#b42318;--shadow:0 10px 30px rgba(15,35,60,.08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-size:18px;line-height:1.55}a{color:inherit}.site-header{background:linear-gradient(135deg,#fff,#eef5ff);border-bottom:1px solid var(--border)}.wrap{width:min(1180px,calc(100% - 32px));margin:auto}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-weight:800;font-size:1.15rem}.brand-mark{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:#e7efff;font-size:25px}.home-link{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border:1px solid var(--border);border-radius:12px;background:#fff;text-decoration:none;font-weight:700}.hero{padding:54px 0 42px}.hero h1{margin:0 0 12px;font-size:clamp(2.15rem,5vw,4rem);line-height:1.05;letter-spacing:-.04em}.hero p{max-width:760px;margin:0;color:var(--muted);font-size:clamp(1.05rem,2vw,1.3rem)}.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.badge{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--border);font-size:.9rem;font-weight:700;color:#334862}.controls{display:grid;grid-template-columns:1fr auto;gap:14px;margin:30px 0 22px}.search{width:100%;padding:15px 17px;border:1px solid var(--border);border-radius:14px;background:#fff;font:inherit;font-size:1rem}.tabs{display:flex;gap:8px;background:#eaf0f7;padding:6px;border-radius:14px;overflow:auto}.tab{border:0;background:transparent;border-radius:10px;padding:11px 16px;font:inherit;font-weight:800;white-space:nowrap;cursor:pointer}.tab.active{background:#fff;color:var(--accent);box-shadow:0 3px 12px rgba(15,35,60,.08)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin:34px 0 16px}.section-head h2{margin:0;font-size:1.65rem}.section-head p{margin:0;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;padding-bottom:44px}.card{background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;min-width:0}.card .icon{height:132px;display:grid;place-items:center;background:linear-gradient(135deg,#f5f8fc,#e9f1fb);font-size:56px}.card-body{padding:20px;display:flex;flex-direction:column;gap:12px;flex:1}.card h3{margin:0;font-size:1.22rem;line-height:1.25}.card p{margin:0;color:var(--muted);font-size:.98rem}.card .meta{display:flex;gap:8px;flex-wrap:wrap}.pill{padding:5px 9px;border-radius:999px;background:#eef4ff;color:#244a86;font-size:.78rem;font-weight:800}.card-link{margin-top:auto;display:inline-flex;justify-content:center;align-items:center;min-height:48px;background:var(--accent);color:#fff;text-decoration:none;border-radius:12px;font-weight:800;padding:11px 14px}.card-link:hover,.primary:hover{background:var(--accent2)}.footer{padding:28px 0 40px;color:var(--muted);font-size:.9rem}.sim-main{padding:34px 0 48px}.sim-intro{display:grid;grid-template-columns:1.4fr .6fr;gap:18px;align-items:start}.sim-intro h1{margin:0 0 8px;font-size:clamp(2rem,4vw,3.25rem);line-height:1.06;letter-spacing:-.035em}.sim-intro p{margin:0;color:var(--muted);font-size:1.05rem}.spec{background:#eef5ff;border:1px solid #d3e2ff;border-radius:16px;padding:16px}.spec strong{display:block;margin-bottom:4px}.sim-grid{display:grid;grid-template-columns:minmax(280px,.78fr) minmax(0,1.22fr);gap:20px;margin-top:24px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:20px;min-width:0}.panel h2,.panel h3{margin-top:0}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field{display:flex;flex-direction:column;gap:7px;min-width:0}.field.full{grid-column:1/-1}.field label{font-weight:800;font-size:.92rem}.field input,.field select,.field textarea{width:100%;min-height:46px;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:#fff;color:var(--text);font:inherit;font-size:1rem}.field input[type=range]{padding:0;min-height:auto}.range-row{display:flex;align-items:center;gap:12px}.range-row input{flex:1}.value-chip{min-width:88px;text-align:center;padding:7px 10px;border-radius:9px;background:var(--surface2);font-weight:800}.buttons{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.button,.primary,.secondary{min-height:46px;border:0;border-radius:11px;padding:10px 15px;font:inherit;font-weight:800;cursor:pointer}.primary{background:var(--accent);color:#fff}.secondary{background:#eaf0f7;color:var(--text);border:1px solid var(--border)}.results{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:16px}.metric{padding:14px;border-radius:14px;background:#f4f7fb;border:1px solid var(--border);min-width:0}.metric .label{font-size:.82rem;color:var(--muted);font-weight:700}.metric .num{margin-top:3px;font-size:1.25rem;font-weight:900;overflow-wrap:anywhere}.canvas-wrap{margin-top:16px;border:1px solid var(--border);border-radius:14px;background:#fbfcfe;padding:10px;overflow:auto}.canvas-wrap canvas,.canvas-wrap svg{width:100%;min-width:520px;height:auto;display:block}.note{margin-top:14px;padding:12px 14px;border-radius:12px;background:#fff8e6;border:1px solid #f0d28a;color:#6f5200}.ok{background:#eaf8f1;border-color:#b5e2c8;color:#175b38}.danger{background:#fff0ee;border-color:#f0c0bb;color:#8e241a}.learn{margin-top:20px}.learn ul{padding-left:1.2rem}.learn li{margin:.35rem 0}.table-wrap{overflow:auto;border:1px solid var(--border);border-radius:12px;margin-top:12px}table{width:100%;border-collapse:collapse;min-width:560px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}th{background:#eef3f8;font-size:.9rem}.quiz{margin-top:18px;padding:16px;border-radius:14px;background:#eef5ff;border:1px solid #d7e5ff}.quiz-row{display:flex;gap:10px;align-items:end;flex-wrap:wrap}.quiz .field{flex:1 1 220px}.feedback{font-weight:800;margin-top:10px}.component-palette{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;max-height:380px;overflow:auto;padding-right:4px}.component{border:1px solid var(--border);background:#fff;border-radius:10px;padding:9px 10px;text-align:left;font:inherit;font-size:.86rem;cursor:pointer}.component:hover{background:#f0f5fb}.board{min-height:330px;border:2px dashed #cfd9e4;border-radius:14px;background:#fbfcfe;padding:14px;display:flex;align-content:flex-start;gap:10px;flex-wrap:wrap}.board-item{padding:10px 12px;border:1px solid #bccbdd;background:#fff;border-radius:10px;font-weight:800;cursor:pointer}.board-empty{color:var(--muted);margin:auto}.status-line{margin-top:12px;padding:12px;border-radius:12px;background:#f4f7fb;border:1px solid var(--border)}@media(max-width:900px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sim-grid,.sim-intro{grid-template-columns:1fr}.controls{grid-template-columns:1fr}.results{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:620px){body{font-size:17px}.wrap{width:min(100% - 20px,1180px)}.hero{padding-top:36px}.grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.results{grid-template-columns:1fr}.panel{padding:16px}.topbar{align-items:flex-start}.home-link{font-size:.9rem;padding:9px 11px}.component-palette{grid-template-columns:1fr}.canvas-wrap canvas,.canvas-wrap svg{min-width:420px}}

/* Interactive 3D learning models */
.model3d-panel{margin-top:24px;padding:0;overflow:hidden;border-color:#cbd8e6;background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%)}
.model3d-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding:22px 24px 16px;border-bottom:1px solid var(--border)}
.model3d-head h2{margin:.25rem 0 .25rem;font-size:1.55rem}.model3d-head p{margin:0;color:var(--muted);font-size:.98rem}.model3d-kicker{font-size:.75rem;font-weight:900;letter-spacing:.12em;color:var(--accent)}
.model3d-live{display:inline-flex;align-items:center;gap:6px;flex:0 0 auto;padding:7px 11px;border-radius:999px;background:#eaf8f1;border:1px solid #b6e2c9;color:#17623c;font-size:.78rem;font-weight:900}
.model3d-stage{position:relative;padding:12px 12px 0;background:linear-gradient(180deg,#f8fbff,#eef4fa)}
.model3d-canvas{display:block;width:100%;height:auto;min-height:360px;max-height:560px;border:1px solid #d6e1ec;border-radius:14px;background:#f5f9fd;cursor:grab;touch-action:pan-y;outline:none}
.model3d-canvas.dragging{cursor:grabbing}.model3d-canvas:focus-visible{box-shadow:0 0 0 4px rgba(21,94,239,.18);border-color:var(--accent)}
.model3d-hint{position:absolute;left:28px;top:28px;padding:7px 10px;border-radius:9px;background:rgba(255,255,255,.86);border:1px solid rgba(191,205,219,.9);color:#455a70;font-size:.77rem;font-weight:800;backdrop-filter:blur(5px)}
.model3d-toolbar{display:flex;gap:8px;flex-wrap:wrap;padding:14px 20px 10px;background:#fff;border-top:1px solid var(--border)}
.model3d-toolbar button{min-height:42px;padding:8px 12px;border:1px solid #cfdbe7;border-radius:10px;background:#f7faff;color:#24364b;font:inherit;font-size:.84rem;font-weight:800;cursor:pointer}.model3d-toolbar button:hover{background:#eaf2ff;border-color:#a9c3ef}.model3d-toolbar button:focus-visible{outline:3px solid rgba(21,94,239,.2);outline-offset:1px}
.model3d-note{margin:0;padding:8px 22px 18px;background:#fff;color:#5a6b7e;font-size:.84rem}
@media(max-width:620px){.model3d-head{padding:18px 16px 14px}.model3d-head{flex-direction:column}.model3d-stage{padding:8px 8px 0}.model3d-canvas{min-height:330px}.model3d-hint{position:static;display:block;margin:0 4px 8px;background:#fff}.model3d-toolbar{padding:12px}.model3d-toolbar button{flex:1 1 42%;}.model3d-note{padding:6px 16px 16px}}