/* 德衡咨询 - 全站样式 */
:root{
  --primary:#1a3a5c;--primary-light:#2c5f8a;--accent:#c8a45c;--accent-light:#e0c488;
  --dark:#1a1a2e;--gray-1:#f8f9fa;--gray-2:#e9ecef;--gray-3:#adb5bd;--gray-4:#6c757d;
  --text:#2d3436;--text-light:#636e72;--white:#fff;--shadow:0 4px 20px rgba(0,0,0,.08);
  --shadow-hover:0 8px 30px rgba(0,0,0,.12);--radius:8px;--transition:all .3s ease;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;color:var(--text);line-height:1.7;background:var(--white);font-size:16px}
a{text-decoration:none;color:inherit;transition:var(--transition)}
img{max-width:100%;display:block}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.btn{display:inline-block;padding:12px 32px;border-radius:var(--radius);font-weight:600;font-size:15px;cursor:pointer;border:none;transition:var(--transition)}
.btn-primary{background:var(--primary);color:var(--white)}
.btn-primary:hover{background:var(--primary-light);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-accent{background:var(--accent);color:var(--white)}
.btn-accent:hover{background:var(--accent-light);transform:translateY(-2px)}
.btn-outline{border:2px solid var(--white);color:var(--white);background:transparent}
.btn-outline:hover{background:var(--white);color:var(--primary)}

/* Header */
.header{position:sticky;top:0;z-index:1000;background:var(--white);box-shadow:0 2px 10px rgba(0,0,0,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{width:42px;height:42px;background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--accent);font-weight:800;font-size:20px}
.logo-text{display:flex;flex-direction:column}
.logo-text strong{font-size:18px;color:var(--primary);letter-spacing:1px}
.logo-text span{font-size:11px;color:var(--gray-4);letter-spacing:2px}
.nav{display:flex;align-items:center;gap:32px}
.nav a{font-size:15px;font-weight:500;color:var(--text);position:relative;padding:4px 0}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav a.active::after{content:'';position:absolute;bottom:-4px;left:0;width:100%;height:2px;background:var(--accent)}
.header-phone{display:flex;align-items:center;gap:8px;color:var(--primary);font-weight:700;font-size:16px}
.header-phone svg{width:18px;height:18px}
.mobile-menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--primary)}

/* Hero */
.hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 60%,#3a7ab5 100%);color:var(--white);padding:80px 0;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-50%;right:-10%;width:600px;height:600px;background:radial-gradient(circle,rgba(200,164,92,.15) 0%,transparent 70%);border-radius:50%}
.hero::after{content:'';position:absolute;bottom:-30%;left:-5%;width:400px;height:400px;background:radial-gradient(circle,rgba(255,255,255,.05) 0%,transparent 70%);border-radius:50%}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center}
.hero-tag{display:inline-block;padding:6px 16px;background:rgba(200,164,92,.2);border:1px solid rgba(200,164,92,.4);border-radius:20px;font-size:13px;color:var(--accent-light);margin-bottom:20px}
.hero h1{font-size:42px;line-height:1.3;font-weight:800;margin-bottom:20px}
.hero h1 span{color:var(--accent-light)}
.hero p{font-size:17px;opacity:.9;margin-bottom:32px;max-width:520px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px}
.hero-stat h3{font-size:32px;font-weight:800;color:var(--accent-light)}
.hero-stat p{font-size:13px;opacity:.8;margin:0}
.hero-card{background:rgba(255,255,255,.08);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.15);border-radius:16px;padding:32px}
.hero-card h3{font-size:20px;margin-bottom:20px;color:var(--accent-light)}
.hero-card ul li{padding:10px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:14px;display:flex;align-items:center;gap:10px}
.hero-card ul li:last-child{border:none}
.hero-card ul li::before{content:'✓';color:var(--accent);font-weight:700}

/* Section */
.section{padding:80px 0}
.section-alt{background:var(--gray-1)}
.section-header{text-align:center;margin-bottom:56px}
.section-tag{display:inline-block;padding:4px 14px;background:rgba(200,164,92,.12);color:var(--accent);border-radius:20px;font-size:13px;font-weight:600;margin-bottom:12px}
.section-header h2{font-size:34px;font-weight:800;color:var(--primary);margin-bottom:12px}
.section-header p{font-size:16px;color:var(--text-light);max-width:640px;margin:0 auto}

/* Services */
.services-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.service-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;box-shadow:var(--shadow);transition:var(--transition);border-top:3px solid transparent}
.service-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-top-color:var(--accent)}
.service-icon{width:52px;height:52px;background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--accent);font-size:22px;font-weight:700;margin-bottom:20px}
.service-card h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:12px}
.service-card p{font-size:14px;color:var(--text-light);line-height:1.7}

/* About / Features */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.feature-item{text-align:center;padding:32px 24px}
.feature-icon{width:64px;height:64px;margin:0 auto 20px;background:var(--gray-1);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:28px}
.feature-item h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:10px}
.feature-item p{font-size:14px;color:var(--text-light)}

/* Process */
.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}
.process-step{text-align:center;position:relative;padding:24px}
.process-num{width:48px;height:48px;background:var(--primary);color:var(--white);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;margin:0 auto 16px;position:relative;z-index:2}
.process-step h3{font-size:16px;font-weight:700;color:var(--primary);margin-bottom:8px}
.process-step p{font-size:13px;color:var(--text-light)}

/* Cases */
.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.case-img{height:180px;background:linear-gradient(135deg,var(--primary),var(--primary-light));display:flex;align-items:center;justify-content:center;color:var(--accent-light);font-size:48px}
.case-body{padding:24px}
.case-body h3{font-size:16px;font-weight:700;color:var(--primary);margin-bottom:8px}
.case-body p{font-size:13px;color:var(--text-light);margin-bottom:12px}
.case-meta{display:flex;gap:12px;font-size:12px;color:var(--gray-4)}
.case-meta span{background:var(--gray-1);padding:3px 10px;border-radius:12px}

/* CTA */
.cta{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:var(--white);padding:64px 0;text-align:center}
.cta h2{font-size:30px;font-weight:800;margin-bottom:12px}
.cta p{font-size:16px;opacity:.9;margin-bottom:28px}

/* City list */
.city-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.city-link{display:block;padding:12px 8px;text-align:center;background:var(--white);border:1px solid var(--gray-2);border-radius:6px;font-size:14px;color:var(--text);transition:var(--transition)}
.city-link:hover{border-color:var(--accent);color:var(--primary);background:rgba(200,164,92,.05)}

/* Article / Content page */
.content-page{padding:60px 0;min-height:60vh}
.content-page h1{font-size:32px;color:var(--primary);margin-bottom:24px;font-weight:800}
.content-page h2{font-size:24px;color:var(--primary);margin:32px 0 16px;font-weight:700;border-left:4px solid var(--accent);padding-left:12px}
.content-page h3{font-size:18px;color:var(--primary);margin:24px 0 12px;font-weight:700}
.content-page p{margin-bottom:16px;color:var(--text);line-height:1.9}
.content-page ul,.content-page ol{margin:16px 0;padding-left:24px}
.content-page ul li,.content-page ol li{margin-bottom:8px;line-height:1.8}
.content-page ul li::marker{color:var(--accent)}
.content-page table{width:100%;border-collapse:collapse;margin:20px 0;font-size:14px}
.content-page th,.content-page td{border:1px solid var(--gray-2);padding:12px;text-align:left}
.content-page th{background:var(--primary);color:var(--white)}
.content-page tr:nth-child(even){background:var(--gray-1)}
.breadcrumb{font-size:14px;color:var(--gray-4);margin-bottom:24px}
.breadcrumb a{color:var(--primary)}
.breadcrumb span{margin:0 8px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-info h2{font-size:28px;color:var(--primary);margin-bottom:24px}
.contact-item{display:flex;gap:16px;margin-bottom:24px;align-items:flex-start}
.contact-icon{width:48px;height:48px;background:var(--gray-1);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.contact-item h4{font-size:16px;color:var(--primary);margin-bottom:4px}
.contact-item p{font-size:14px;color:var(--text-light)}
.contact-form{background:var(--gray-1);padding:32px;border-radius:var(--radius)}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:14px;font-weight:600;margin-bottom:6px;color:var(--text)}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:12px 16px;border:1px solid var(--gray-2);border-radius:6px;font-size:14px;font-family:inherit;transition:var(--transition)}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,58,92,.1)}
.form-group textarea{resize:vertical;min-height:100px}

/* Footer */
.footer{background:var(--dark);color:rgba(255,255,255,.7);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.5fr;gap:40px;padding-bottom:40px}
.footer-brand h3{color:var(--white);font-size:20px;margin-bottom:12px}
.footer-brand p{font-size:13px;line-height:1.8;margin-bottom:16px}
.footer-col h4{color:var(--white);font-size:15px;margin-bottom:16px;font-weight:700}
.footer-col ul li{margin-bottom:10px;font-size:13px}
.footer-col ul li a:hover{color:var(--accent)}
.footer-contact p{font-size:13px;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:12px;color:rgba(255,255,255,.4)}
.footer-bottom a{color:rgba(255,255,255,.4)}

/* Floating call button (only one at bottom) */
.float-call{position:fixed;bottom:24px;right:24px;z-index:999;background:var(--accent);color:var(--white);width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px rgba(200,164,92,.4);transition:var(--transition);font-size:24px}
.float-call:hover{transform:scale(1.1);background:var(--accent-light)}

/* Responsive */
@media(max-width:992px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero h1{font-size:32px}
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .process-grid{grid-template-columns:repeat(2,1fr)}
  .cases-grid{grid-template-columns:repeat(2,1fr)}
  .city-grid{grid-template-columns:repeat(4,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--white);flex-direction:column;padding:20px;gap:16px;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .mobile-menu-btn{display:block}
  .header-phone{display:none}
  .hero{padding:50px 0}
  .hero h1{font-size:26px}
  .hero-stats{grid-template-columns:repeat(3,1fr);gap:12px}
  .hero-stat h3{font-size:24px}
  .section{padding:50px 0}
  .section-header h2{font-size:26px}
  .services-grid{grid-template-columns:1fr 1fr;gap:16px}
  .service-card{padding:20px 16px}
  .features-grid{grid-template-columns:1fr}
  .process-grid{grid-template-columns:1fr 1fr}
  .cases-grid{grid-template-columns:1fr}
  .city-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .content-page h1{font-size:24px}
}