:root{--bg:#f6f8fb;--card:#fff;--text:#152033;--muted:#5b6878;--line:#e4e9f0;--brand:#315efb;--brand2:#173bb8}
*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}
a{color:inherit;text-decoration:none}.container{width:min(1160px,92%);margin:auto}
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.nav{display:flex;align-items:center;justify-content:space-between;min-height:68px;gap:18px}
.brand{font-size:1.35rem;font-weight:800;letter-spacing:-.04em}.brand span{color:var(--brand)}nav{display:flex;gap:20px;align-items:center}nav a{font-size:.95rem;color:var(--muted)}nav a:hover{color:var(--text)}
.hero{padding:76px 0 50px;text-align:center}.hero h1{font-size:clamp(2.3rem,6vw,4.7rem);line-height:1.03;letter-spacing:-.06em;margin:0 auto 20px;max-width:980px}.hero p{max-width:760px;margin:0 auto 28px;color:var(--muted);font-size:1.1rem}
.search{max-width:680px;margin:0 auto;display:flex;background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:0 12px 35px rgba(20,35,70,.07)}.search input{flex:1;border:0;outline:0;padding:12px;font-size:1rem}
.search button,.btn{border:0;background:var(--brand);color:#fff;padding:12px 18px;border-radius:10px;font-weight:700;cursor:pointer}
.section{padding:38px 0}.section h2{font-size:1.9rem;letter-spacing:-.035em;margin:0 0 8px}.lead{color:var(--muted);margin:0 0 25px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;transition:.18s}.card:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(20,35,70,.07)}
.card h3{margin:0 0 7px;font-size:1.08rem}.card p{margin:0;color:var(--muted);font-size:.93rem}.badge{display:inline-block;font-size:.74rem;font-weight:800;color:var(--brand2);background:#edf1ff;padding:5px 9px;border-radius:999px;margin-bottom:12px}
.ad-slot{border:1px dashed #c8d0dc;border-radius:12px;min-height:100px;display:flex;align-items:center;justify-content:center;color:#8a95a5;background:#fafbfd;margin:28px 0;font-size:.84rem}
.tool-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:30px;padding:42px 0}.tool-main h1{font-size:2.5rem;letter-spacing:-.05em;margin:0 0 8px}.intro{color:var(--muted);font-size:1.06rem;margin-bottom:25px}
.calc{background:white;border:1px solid var(--line);border-radius:18px;padding:24px;margin-bottom:26px}.field{margin-bottom:16px}.field label{display:block;font-size:.9rem;font-weight:700;margin-bottom:6px}.field input,.field textarea,.field select{width:100%;border:1px solid #cfd6e2;border-radius:10px;padding:12px 13px;font:inherit}
.result{margin-top:18px;background:#f0f4ff;border-radius:12px;padding:18px}.result strong{font-size:1.5rem;display:block;white-space:pre-wrap}.result small{color:var(--muted)}
.article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;margin-bottom:20px}.article h2{margin-top:0}.article h3{margin-top:25px}.article p,.article li{color:#445064}
.sidebar{position:sticky;top:92px;align-self:start}.sidebox{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:18px}.sidebox h3{margin:0 0 12px}.sidebox a{display:block;padding:8px 0;color:var(--muted);font-size:.92rem;border-bottom:1px solid #f0f2f5}.sidebox a:last-child{border-bottom:0}
.page{padding:46px 0}.page h1{font-size:2.6rem;letter-spacing:-.045em}.prose{max-width:860px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px}.prose h2{margin-top:30px}.prose p,.prose li{color:#445064}
.category-intro{max-width:820px}.guide-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
footer{margin-top:55px;background:#111827;color:#d5dbea;padding:44px 0}.foot{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}.foot p,.foot a{color:#9ca9ba;font-size:.92rem}.foot a{display:block;padding:4px 0}.copyright{border-top:1px solid #273246;margin-top:30px;padding-top:20px;color:#8591a3;font-size:.86rem}
@media(max-width:850px){.grid{grid-template-columns:repeat(2,1fr)}.guide-list{grid-template-columns:1fr}.tool-wrap{grid-template-columns:1fr}.sidebar{position:static}.foot{grid-template-columns:1fr 1fr}nav a.hide-sm{display:none}}
@media(max-width:560px){.grid{grid-template-columns:1fr}.hero{padding-top:52px}.hero h1{font-size:2.6rem}.tool-main h1,.page h1{font-size:2rem}.foot{grid-template-columns:1fr}.search{padding:6px}.search button{padding:10px 12px}}