*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;}
body{background:#f5f7fa;color:#333;line-height:1.6;min-height:100vh;}

/* Header */
.site-header{background:#fff;border-bottom:1px solid #e8e8e8;position:sticky;top:0;z-index:100;}
.header-inner{max-width:1200px;margin:0 auto;padding:15px 20px;display:flex;justify-content:space-between;align-items:center;}
.site-brand{display:flex;align-items:center;gap:12px;}
.brand-icon{width:44px;height:44px;background:linear-gradient(135deg,#1890ff,#096dd9);color:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:bold;box-shadow:0 2px 8px rgba(24,144,255,0.3);}
.brand-text h1{font-size:20px;color:#333;font-weight:600;}
.brand-text span{font-size:12px;color:#999;}
.site-nav{display:flex;gap:25px;}
.site-nav a{color:#666;text-decoration:none;font-size:14px;font-weight:500;transition:color .2s;}
.site-nav a:hover{color:#1890ff;}
.site-nav .nav-home{color:#1890ff;font-weight:600;padding:4px 14px;background:#e6f4ff;border-radius:6px;transition:all .2s;}
.site-nav .nav-home:hover{background:#1890ff;color:#fff;}

/* Hero */
.site-hero{background:linear-gradient(135deg,#1890ff 0%,#096dd9 50%,#0050b3 100%);color:#fff;padding:60px 20px;text-align:center;}
.hero-inner{max-width:800px;margin:0 auto;}
.hero-inner h2{font-size:36px;font-weight:700;margin-bottom:15px;letter-spacing:1px;}
.hero-inner p{font-size:16px;opacity:0.9;margin-bottom:30px;}
.hero-stats{display:flex;justify-content:center;gap:50px;margin-top:20px;}
.stat-item strong{display:block;font-size:24px;font-weight:700;}
.stat-item span{font-size:13px;opacity:0.85;}

/* Main */
.site-main{max-width:1200px;margin:0 auto;padding:40px 20px;}

/* Tool categories */
.tool-category{margin-bottom:50px;}
.category-header{display:flex;align-items:baseline;gap:15px;margin-bottom:25px;padding-bottom:12px;border-bottom:2px solid #f0f0f0;}
.category-header h2{font-size:22px;font-weight:600;color:#333;}
.cat-desc{font-size:13px;color:#999;}

/* Tool grid */
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.tool-card{background:#fff;border-radius:12px;padding:20px;text-align:center;text-decoration:none;color:inherit;transition:all .3s ease;border:1px solid #f0f0f0;display:flex;flex-direction:column;align-items:center;}
.tool-card:hover{border-color:#1890ff;box-shadow:0 6px 20px rgba(24,144,255,0.12);transform:translateY(-3px);}
.tool-icon-box{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;box-shadow:0 4px 10px rgba(0,0,0,0.1);}
.tool-icon-box svg{width:28px;height:28px;}
.tool-icon-box.code{background:linear-gradient(135deg,#667eea,#764ba2);}
.tool-icon-box.data{background:linear-gradient(135deg,#f093fb,#f5576c);}
.tool-icon-box.hex{background:linear-gradient(135deg,#4facfe,#00f2fe);}
.tool-icon-box.regex{background:linear-gradient(135deg,#fa709a,#fee140);}
.tool-icon-box.time{background:linear-gradient(135deg,#43e97b,#38f9d7);}
.tool-icon-box.domain{background:linear-gradient(135deg,#fa8c16,#faad14);}
.tool-icon-box.health{background:linear-gradient(135deg,#11998e,#38ef7d);}
.tool-icon-box.calc{background:linear-gradient(135deg,#667eea,#764ba2);}
.tool-icon-box.age{background:linear-gradient(135deg,#f093fb,#f5576c);}
.tool-icon-box.retire{background:linear-gradient(135deg,#fa709a,#fee140);}
.tool-icon-box.calc2{background:linear-gradient(135deg,#4facfe,#00f2fe);}
.tool-icon-box.text{background:linear-gradient(135deg,#43e97b,#38f9d7);}
.tool-icon-box.lock{background:linear-gradient(135deg,#fa709a,#fee140);}
.tool-icon-box.family{background:linear-gradient(135deg,#667eea,#764ba2);}
.tool-icon-box.image{background:linear-gradient(135deg,#f093fb,#f5576c);}
.tool-icon-box.favicon{background:linear-gradient(135deg,#4facfe,#00f2fe);}
.tool-icon-box.cloud{background:linear-gradient(135deg,#43e97b,#38f9d7);}
.tool-icon-box.network{background:linear-gradient(135deg,#fa8c16,#faad14);}
.tool-icon-box.location{background:linear-gradient(135deg,#fa709a,#fee140);}
.tool-icon-box.phone{background:linear-gradient(135deg,#667eea,#764ba2);}
.tool-icon-box.beijing{background:linear-gradient(135deg,#fa8c16,#faad14);}
.tool-icon-box.us{background:linear-gradient(135deg,#4facfe,#00f2fe);}
.tool-icon-box.germany{background:linear-gradient(135deg,#f093fb,#f5576c);}
.tool-icon-box.la{background:linear-gradient(135deg,#43e97b,#38f9d7);}
.tool-icon-box.holiday{background:linear-gradient(135deg,#fa709a,#fee140);}
.tool-icon-box.calendar{background:linear-gradient(135deg,#667eea,#764ba2);}
.tool-icon-box.exchange{background:linear-gradient(135deg,#fa8c16,#faad14);}
.tool-icon-box.currency{background:linear-gradient(135deg,#43e97b,#38f9d7);}
.tool-icon-box.gold{background:linear-gradient(135deg,#faad14,#ffec3d);}
.tool-icon-box.convert{background:linear-gradient(135deg,#4facfe,#00f2fe);}
.tool-icon-box.text2{background:linear-gradient(135deg,#f093fb,#f5576c);}
.tool-icon-box.bazi{background:linear-gradient(135deg,#fa709a,#fee140);}
.tool-icon-box.car{background:linear-gradient(135deg,#667eea,#764ba2);}
.tool-icon-box.cpu{background:linear-gradient(135deg,#4facfe,#00f2fe);}
.tool-card h3{font-size:15px;font-weight:600;color:#333;margin:8px 0 4px;}
.tool-card p{font-size:12px;color:#888;margin-bottom:10px;line-height:1.4;}
.tool-tag{display:inline-block;padding:3px 10px;background:#f5f7fa;border-radius:10px;font-size:11px;color:#666;}

/* Intro section */
.site-intro{background:#fff;border-radius:12px;padding:40px;margin-top:40px;box-shadow:0 2px 12px rgba(0,0,0,0.04);}
.intro-inner h2{font-size:22px;font-weight:600;color:#333;margin-bottom:20px;padding-left:15px;border-left:4px solid #1890ff;}
.intro-inner p{color:#555;font-size:14px;line-height:1.9;margin-bottom:15px;}

/* Friend links */
.friend-links{background:#fff;border-radius:12px;padding:20px 40px;margin-top:40px;box-shadow:0 2px 12px rgba(0,0,0,0.04);}
.friend-links-inner{display:flex;align-items:center;gap:20px;flex-wrap:wrap;}
.friend-links-inner h2{font-size:14px;font-weight:600;color:#555;margin:0;white-space:nowrap;padding-right:20px;border-right:1px solid #eee;}
.fl-list{display:flex;flex-wrap:wrap;gap:0;}
.fl-list a{color:#666;text-decoration:none;font-size:13px;padding:4px 14px;border-right:1px solid #eee;transition:all .2s;}
.fl-list a:last-child{border-right:none;}
.fl-list a:hover{color:#1890ff;}

/* Footer */
.site-footer{background:#fff;border-top:1px solid #e8e8e8;margin-top:40px;}
.footer-inner{max-width:1200px;margin:0 auto;padding:40px 20px;display:grid;grid-template-columns:repeat(3,1fr);gap:30px;}
.footer-section h4{font-size:15px;color:#333;margin-bottom:15px;font-weight:600;}
.footer-section p{color:#888;font-size:13px;line-height:1.8;}
.footer-section a{display:block;color:#888;text-decoration:none;font-size:13px;margin-bottom:8px;transition:color .2s;}
.footer-section a:hover{color:#1890ff;}
.footer-bottom{border-top:1px solid #f0f0f0;padding:20px;text-align:center;color:#999;font-size:12px;}

/* Back to top */
.back-to-top{position:fixed;bottom:30px;right:30px;width:42px;height:42px;background:#1890ff;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;cursor:pointer;z-index:1000;box-shadow:0 4px 12px rgba(24,144,255,0.35);line-height:1;transition:all .3s;}
.back-to-top:hover{background:#096dd9;transform:translateY(-2px);}

/* Responsive */
@media(max-width:992px){
.tool-grid{grid-template-columns:repeat(3,1fr);}
.hero-stats{gap:30px;}
.footer-inner{grid-template-columns:1fr;}
}
@media(max-width:768px){
.site-nav{display:none;}
.hero-inner h2{font-size:26px;}
.hero-stats{flex-direction:column;gap:20px;}
.tool-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
.tool-card{padding:15px 10px;}
.tool-icon-box{width:48px;height:48px;}
.tool-icon-box svg{width:24px;height:24px;}
.tool-card h3{font-size:14px;}
.tool-card p{font-size:12px;}
.site-intro{padding:25px 20px;}
.category-header{flex-direction:column;gap:5px;}
.back-to-top{bottom:20px;right:20px;width:38px;height:38px;font-size:18px;}
.friend-links{padding:15px 20px;}
.friend-links-inner{flex-direction:column;align-items:flex-start;gap:8px;}
.friend-links-inner h2{border-right:none;padding-right:0;border-bottom:1px solid #eee;padding-bottom:6px;width:100%;}
.fl-list a{padding:4px 10px;font-size:12px;}
}