:root{--primary:#1e3a5f;--primary-dark:#0f2340;--primary-light:#2c5f8a;--accent:#e8712a;--accent-light:#f59e5e;--bg:#f8f9fa;--card:#fff;--text:#1a1a2e;--text-light:#555;--border:#dfe3e8;--radius:12px;--shadow:0 2px 16px rgba(0,0,0,.07);--max-w:1120px;--nav-bg:rgba(30,58,95,.97)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.7}
a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-light)}
img{max-width:100%;height:auto}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}
.navbar{background:var(--nav-bg);backdrop-filter:blur(14px);position:sticky;top:0;z-index:100;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.nav-inner{max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:62px}
.nav-logo{color:#fff;font-size:1.4rem;font-weight:800;letter-spacing:-.5px}
.nav-logo span{color:var(--accent)}
.nav-links{display:flex;gap:26px}
.nav-links a{color:rgba(255,255,255,.88);font-size:.95rem;font-weight:500;transition:color .2s}
.nav-links a:hover{color:#fff}
.hamburger{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}
.hero{background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 60%,var(--primary-light) 100%);color:#fff;padding:65px 20px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-50%;right:-20%;width:400px;height:400px;background:radial-gradient(circle,rgba(232,113,42,.15),transparent 70%);border-radius:50%}
.hero h1{font-size:2.5rem;font-weight:900;margin-bottom:14px;position:relative}
.hero p{font-size:1.1rem;opacity:.9;max-width:620px;margin:0 auto 28px;position:relative}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative}
.btn{display:inline-block;padding:13px 30px;border-radius:var(--radius);font-weight:600;font-size:.95rem;transition:all .2s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-light);transform:translateY(-2px)}
.btn-secondary{background:rgba(255,255,255,.12);color:#fff;border:1.5px solid rgba(255,255,255,.35)}
.btn-secondary:hover{background:rgba(255,255,255,.22)}
.section-title{font-size:1.7rem;font-weight:800;margin-bottom:26px;text-align:center;color:var(--primary-dark);padding-top:42px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px;padding-bottom:22px}
.tool-card{background:var(--card);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s;border:1px solid var(--border);display:block;color:var(--text)}
.tool-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.12)}
.tool-icon{font-size:2rem;display:block;margin-bottom:10px}
.tool-card h3{font-size:1.02rem;font-weight:700;margin-bottom:4px;color:var(--primary-dark)}
.tool-card p{font-size:.82rem;color:var(--text-light)}
.tool-page{max-width:var(--max-w);margin:0 auto;padding:20px}
.breadcrumb{font-size:.85rem;color:var(--text-light);margin-bottom:16px}
.breadcrumb a{color:var(--primary)}
.tool-page h1{font-size:1.8rem;font-weight:800;margin-bottom:8px}
.desc{color:var(--text-light);margin-bottom:22px}
.calc-box{background:var(--card);padding:26px;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}
.calc-box label{display:block;font-weight:600;margin-bottom:6px;font-size:.9rem}
.calc-box input,.calc-box select{padding:10px 14px;border:1.5px solid var(--border);border-radius:8px;font-size:1rem;width:100%;max-width:300px;margin-bottom:12px;transition:border-color .2s}
.calc-box input:focus,.calc-box select:focus{border-color:var(--primary);outline:none}
.calc-box button{background:var(--accent);color:#fff;border:none;padding:13px 34px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s}
.calc-box button:hover{background:var(--accent-light)}
.result-box{margin-top:16px;padding:16px;background:var(--bg);border-radius:8px;border-left:4px solid var(--primary);display:none}
.result-box.show{display:block}
.result-box strong{font-size:1.3rem;color:var(--primary-dark)}
.article-page{max-width:800px;margin:0 auto;padding:20px}
.article-meta{display:flex;gap:16px;color:var(--text-light);font-size:.85rem;margin-bottom:22px}
.article-page h2{font-size:1.3rem;margin:26px 0 10px;color:var(--primary-dark)}
.article-page p{margin-bottom:12px}
.article-page img{border-radius:var(--radius);margin:18px 0;width:100%}
.tool-mention{color:var(--accent);font-weight:600;border-bottom:1px dashed var(--primary-light)}
.footer{background:var(--primary-dark);color:rgba(255,255,255,.85);padding:44px 20px 22px;margin-top:44px}
.footer-grid{max-width:var(--max-w);margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:26px}
.footer h4{color:#fff;margin-bottom:12px;font-size:1rem}
.footer a{color:rgba(255,255,255,.7);font-size:.88rem;display:block;margin-bottom:7px}
.footer a:hover{color:#fff}
.footer-bottom{text-align:center;margin-top:26px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:.82rem}
.static-page{max-width:800px;margin:0 auto;padding:20px}
.static-page h1{font-size:1.8rem;margin-bottom:18px;color:var(--primary-dark)}
.static-page h2{font-size:1.3rem;margin:26px 0 10px;color:var(--primary)}
.static-page p,.static-page li{margin-bottom:10px;color:var(--text-light)}
.static-page ul{padding-left:22px}
@media(max-width:768px){
.nav-links{display:none;position:absolute;top:62px;left:0;right:0;background:var(--nav-bg);flex-direction:column;padding:18px 20px;gap:14px}
.nav-links.open{display:flex}
.hamburger{display:block}
.hero h1{font-size:1.65rem}
.tool-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
}