:root{--bg:#f7f8fc;--panel:#fff;--ink:#171923;--muted:#5f6675;--line:#dfe3ee;--brand:#3857a6;--brand2:#6f42c1;--soft:#edf2ff;--success:#1f7a55;--warn:#996500;--danger:#b42318;--radius:22px;--shadow:0 12px 32px rgba(20,26,48,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:14px 6vw;background:rgba(247,248,252,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;color:var(--ink)}.brand:hover{text-decoration:none}.brand-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:grid;place-items:center;font-weight:900}.brand small{display:block;color:var(--muted);font-size:.78rem;margin-top:-3px}.site-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.site-nav a{padding:8px 12px;border-radius:999px;color:#2b3040;font-weight:650;font-size:.95rem}.site-nav a.active,.site-nav a:hover{background:var(--soft);text-decoration:none;color:var(--brand)}.nav-toggle{display:none;border:0;background:var(--panel);border-radius:12px;padding:8px 12px;font-size:1.4rem}.hero{padding:72px 6vw 42px;background:radial-gradient(circle at 10% 10%,#eaf0ff 0,transparent 34%),radial-gradient(circle at 90% 0,#f2eaff 0,transparent 30%)}.hero-inner{max-width:1160px;margin:0 auto;display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;background:var(--soft);color:var(--brand);border:1px solid #c8d4ff;border-radius:999px;padding:7px 12px;font-weight:750;font-size:.88rem}h1{font-size:clamp(2.3rem,6vw,5rem);line-height:1.02;margin:18px 0;color:#111827;letter-spacing:-.04em}h2{font-size:clamp(1.6rem,3vw,2.6rem);line-height:1.1;margin:0 0 16px;letter-spacing:-.025em}h3{font-size:1.25rem;margin:0 0 10px}p.lead{font-size:clamp(1.08rem,2vw,1.35rem);color:var(--muted);max-width:760px}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;padding:12px 18px;font-weight:800;border:1px solid var(--line);background:var(--panel);color:var(--ink);box-shadow:0 4px 10px rgba(0,0,0,.04)}.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:0}.btn:hover{text-decoration:none;transform:translateY(-1px)}.panel{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:24px}.section{padding:48px 6vw}.section-inner{max-width:1160px;margin:0 auto}.grid{display:grid;gap:18px}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}.grid.cols-4{grid-template-columns:repeat(4,1fr)}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 5px 18px rgba(20,26,48,.04)}.card h3{font-size:1.15rem}.card p{color:var(--muted);margin:.25rem 0 .75rem}.card .icon{width:46px;height:46px;border-radius:16px;background:var(--soft);display:grid;place-items:center;font-size:1.5rem;margin-bottom:14px}.help-shell{display:grid;grid-template-columns:280px 1fr;gap:24px;max-width:1240px;margin:0 auto;padding:28px 6vw 56px}.help-sidebar{position:sticky;top:92px;align-self:start}.help-sidebar .panel{padding:14px;max-height:calc(100vh - 120px);overflow:auto}.help-sidebar a{display:block;padding:9px 10px;border-radius:12px;color:#303646;font-weight:650}.help-sidebar a:hover{background:var(--soft);text-decoration:none}.help-content{min-width:0}.breadcrumb{font-size:.92rem;color:var(--muted);margin-bottom:16px}.article-header{padding:28px;border-radius:var(--radius);background:linear-gradient(135deg,#fff,#f0f4ff);border:1px solid #d6def7;margin-bottom:20px}.article-header h1{font-size:clamp(2rem,4vw,3.5rem);margin:8px 0 10px}.badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.badge{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 10px;font-weight:750;color:#3b4356;font-size:.88rem}.article-section{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:18px 0}.action-list{display:grid;gap:12px}.action{display:grid;grid-template-columns:auto 1fr;gap:14px;padding:14px;border:1px solid #e6e9f2;border-radius:18px;background:#fbfcff}.action .num{width:38px;height:38px;border-radius:13px;background:var(--soft);display:grid;place-items:center;font-weight:900;color:var(--brand)}.action h3{margin:0;font-size:1.06rem}.action p{margin:3px 0 0;color:var(--muted)}.checklist,.mistakes,.related-list{display:grid;gap:10px;padding:0;margin:0;list-style:none}.checklist li,.mistakes li{padding:12px 14px;border-radius:16px;background:#f8fafc;border:1px solid #e7eaf2}.checklist li:before{content:'✓ ';color:var(--success);font-weight:900}.mistakes li:before{content:'Avoid: ';color:var(--danger);font-weight:900}.related-list{grid-template-columns:repeat(2,1fr)}.related-list a{display:block;padding:14px;border:1px solid var(--line);border-radius:16px;background:#fbfcff;font-weight:760}.search-box{display:flex;gap:8px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 12px;box-shadow:0 6px 18px rgba(20,26,48,.05)}.search-box input{border:0;outline:0;width:100%;font-size:1.05rem;background:transparent;padding:8px}.search-results{display:grid;gap:10px;margin-top:14px}.search-result{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}.search-result strong{display:block;color:var(--ink)}.search-result span{color:var(--muted)}.site-footer{padding:42px 6vw;border-top:1px solid var(--line);background:#fff;display:grid;grid-template-columns:1.1fr 1fr;gap:24px}.footer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.fineprint{grid-column:1/-1;color:var(--muted);font-size:.9rem}.notice{border-left:4px solid var(--brand);background:var(--soft);padding:14px;border-radius:12px;color:#26345f}.warn{border-left-color:var(--warn);background:#fff8e6}.contact-form{display:grid;gap:14px}.contact-form input,.contact-form textarea{width:100%;padding:12px;border:1px solid var(--line);border-radius:14px;font:inherit}@media (max-width:900px){.hero-inner,.help-shell,.grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}.help-sidebar{position:static}.site-footer{grid-template-columns:1fr}}@media (max-width:720px){.site-header{align-items:flex-start}.nav-toggle{display:block}.site-nav{display:none;width:100%;flex-direction:column;align-items:stretch}.site-nav.open{display:flex}.site-nav a{display:block}.brand small{display:none}.hero{padding-top:40px}.related-list{grid-template-columns:1fr}.article-section,.article-header{padding:18px}}