:root{
  --ink:#172033;--muted:#5d6678;--line:#e7eaf1;--paper:#ffffff;--soft:#f5f7fb;
  --brand:#2457c5;--brand-dark:#163c8e;--accent:#fff4c2;--accent-2:#fff9dc;
  --green:#16794a;--orange:#b45c00;--code:#111827;--code-bg:#f7f8fb;
  --shadow:0 16px 45px rgba(21,31,54,.10);--radius:18px;--radius-sm:12px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.58;font-size:16px}
a{color:var(--brand);text-decoration:none} a:hover{text-decoration:underline}.container{width:min(1160px,calc(100% - 32px));margin:auto}.skip{position:absolute;left:-999px;top:auto}.skip:focus{left:16px;top:16px;background:#fff;padding:12px 16px;border:2px solid var(--brand);z-index:99}.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:72px}.brand{display:flex;align-items:center;gap:10px;font-weight:850;color:var(--ink);letter-spacing:-.02em}.brand-mark{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--brand),#6c8cff);display:grid;place-items:center;color:#fff;font-weight:900}.brand span:last-child{font-size:1.08rem}.nav{display:flex;align-items:center;gap:4px}.nav a,.dropbtn{padding:11px 13px;border-radius:12px;color:var(--ink);font-weight:650;font-size:.95rem}.nav a:hover,.drop:hover .dropbtn,.nav a.active{background:#eef3ff;text-decoration:none}.drop{position:relative}.dropbtn{display:inline-flex;align-items:center;gap:6px;cursor:default}.dropmenu{position:absolute;top:43px;left:0;min-width:260px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:10px;display:none}.drop:hover .dropmenu,.drop:focus-within .dropmenu{display:block}.dropmenu a{display:block;color:var(--ink);padding:10px 12px;border-radius:11px}.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;font-weight:800}.hero{background:linear-gradient(180deg,#f7f9ff 0%,#fff 100%);border-bottom:1px solid #eef1f7}.hero-inner{padding:48px 0 38px}.kicker{display:inline-flex;align-items:center;gap:7px;background:#eef3ff;color:#183a8a;padding:7px 11px;border-radius:999px;font-weight:800;font-size:.86rem;margin-bottom:16px}.hero h1{font-size:clamp(2rem,4vw,4.2rem);line-height:1.02;letter-spacing:-.055em;margin:0 0 16px;max-width:980px}.hero p{font-size:clamp(1.05rem,1.8vw,1.24rem);color:var(--muted);max-width:820px;margin:0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;background:var(--brand);color:#fff;border-radius:12px;padding:12px 16px;font-weight:800;box-shadow:0 9px 18px rgba(36,87,197,.18)}.btn:hover{background:var(--brand-dark);text-decoration:none}.btn.secondary{background:#fff;color:var(--ink);border-color:var(--line);box-shadow:none}.btn.disabled{background:#eef0f5;color:#7b8392;pointer-events:none}.ideas{background:var(--accent-2);border:1px solid #f0dd8f;border-radius:var(--radius);padding:20px;margin:26px auto 30px;box-shadow:0 8px 25px rgba(94,78,0,.05)}.ideas-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:14px}.ideas h2{margin:0;font-size:1.24rem;letter-spacing:-.02em}.ideas p{margin:3px 0 0;color:#665a24}.idea-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.idea-card{background:#fff;border:1px solid #efdf9a;border-radius:14px;padding:14px;color:var(--ink)}.idea-card strong{display:block;margin-bottom:4px}.idea-card small{display:block;color:var(--muted);line-height:1.45}.idea-card:hover{text-decoration:none;box-shadow:0 8px 22px rgba(80,70,20,.09)}main{padding-bottom:50px}.section{padding:34px 0}.grid{display:grid;gap:18px}.grid.two{grid-template-columns:repeat(2,1fr)}.grid.three{grid-template-columns:repeat(3,1fr)}.grid.four{grid-template-columns:repeat(4,1fr)}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:0 8px 25px rgba(25,33,61,.04)}.card h2,.card h3{margin-top:0;letter-spacing:-.025em}.card p:last-child{margin-bottom:0}.hub-card{display:flex;flex-direction:column;gap:8px;color:var(--ink);min-height:155px}.hub-card:hover{text-decoration:none;box-shadow:var(--shadow);transform:translateY(-1px)}.hub-card .emoji{font-size:1.7rem}.muted{color:var(--muted)}.pill-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.pill{display:inline-flex;align-items:center;background:#f0f4ff;color:#203e88;padding:6px 10px;border-radius:999px;font-weight:700;font-size:.84rem}.breadcrumbs{font-size:.9rem;color:var(--muted);padding-top:20px}.breadcrumbs a{color:var(--muted)}.article{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}.content h2{font-size:1.75rem;line-height:1.18;letter-spacing:-.035em;margin-top:34px}.content h3{font-size:1.25rem;letter-spacing:-.02em;margin-top:25px}.quick-answer{border:1px solid #d9e2ff;background:#f5f8ff;border-radius:var(--radius);padding:20px}.formula-box{position:relative;background:var(--code-bg);border:1px solid #dfe3ec;border-radius:14px;padding:16px;margin:12px 0;overflow-x:auto}.formula-box code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;color:var(--code);font-weight:700;white-space:pre}.copy-btn{position:absolute;right:10px;top:10px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:6px 9px;font-weight:800;font-size:.78rem;cursor:pointer}.copy-btn.copied{background:#e9fff4;color:var(--green);border-color:#b6efd2}.example-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.example{border:1px solid var(--line);border-radius:16px;padding:16px;background:#fff}.example .level{font-weight:900;color:var(--brand);font-size:.82rem;text-transform:uppercase;letter-spacing:.05em}.data-table{width:100%;border-collapse:collapse;overflow:hidden;border-radius:12px;margin:16px 0;border:1px solid var(--line)}.data-table th,.data-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}.data-table th{background:#f6f8fc;font-size:.88rem}.data-table tr:last-child td{border-bottom:0}.steps{counter-reset:step;list-style:none;padding:0;margin:16px 0}.steps li{counter-increment:step;margin:12px 0;padding:14px 16px 14px 54px;border:1px solid var(--line);border-radius:14px;position:relative;background:#fff}.steps li:before{content:counter(step);position:absolute;left:15px;top:14px;width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:.85rem;font-weight:900}.toc{position:sticky;top:96px}.toc h3{margin-top:0}.toc a{display:block;color:var(--muted);padding:8px 0;border-bottom:1px solid #eef0f4;font-size:.94rem}.related-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.related-list a{border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:#fff;color:var(--ink);font-weight:700}.related-list a:hover{text-decoration:none;background:#f6f8ff}.search-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);margin-top:24px}.searchbar{display:flex;gap:10px}.searchbar input{flex:1;border:1px solid var(--line);border-radius:12px;padding:14px 15px;font-size:1rem}.search-results{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:12px}.result{border:1px solid var(--line);border-radius:12px;padding:12px;color:var(--ink)}.result:hover{background:#f8faff;text-decoration:none}.ad-slot{border:1px dashed #ccd3df;background:#fafbfe;border-radius:14px;padding:18px;text-align:center;color:#7b8392;margin:24px 0;font-size:.92rem}.footer{border-top:1px solid var(--line);background:#f8f9fc;margin-top:40px}.footer-inner{padding:32px 0;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}.footer a{display:block;color:var(--muted);margin:8px 0}.notice{background:#f7f9fc;border:1px solid var(--line);border-radius:14px;padding:14px;color:var(--muted);font-size:.94rem}.template-status{background:#fff8dc;border:1px solid #ecd988;border-radius:14px;padding:16px;margin:16px 0}.tag{font-size:.78rem;background:#edf2ff;color:#21438f;border-radius:999px;padding:4px 8px;font-weight:800}.site-note{font-size:.9rem;color:var(--muted)}
@media (max-width:900px){.menu-toggle{display:inline-flex}.nav{display:none;position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.nav.open{display:flex}.dropmenu{position:static;display:block;box-shadow:none;border:0;padding:0 0 0 12px}.nav a,.dropbtn{display:block}.article{grid-template-columns:1fr}.toc{position:static}.idea-grid,.grid.four{grid-template-columns:repeat(2,1fr)}.grid.three,.grid.two,.example-list,.search-results,.related-list,.footer-inner{grid-template-columns:1fr}.hero-inner{padding:34px 0 24px}}
@media (max-width:560px){.container{width:min(100% - 22px,1160px)}.idea-grid{grid-template-columns:1fr}.hero h1{font-size:2rem}.card{padding:16px}.formula-box{padding-top:46px}.searchbar{flex-direction:column}.footer-inner{gap:10px}.ideas-head{display:block}.nav-wrap{min-height:64px}.nav{top:64px}.brand span:last-child{font-size:1rem}}