/* ========================================
   SANYOU-TRANS · 三友捷运
   common.css — 公共样式（所有页面共享）
   ======================================== */

/* ====== RESET & BASE ====== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}

/* ====== CSS VARIABLES ====== */
:root{
  --bg:#060B14;
  --bg2:#0B1424;
  --bg3:#101E36;
  --surface:rgba(255,255,255,0.045);
  --surface-hover:rgba(255,255,255,0.08);
  --glass:rgba(255,255,255,0.06);
  --glass-border:rgba(255,255,255,0.1);
  --ink:#F1F5F9;
  --ink-bright:#FFFFFF;
  --muted:#94A3B8;
  --muted-light:#B0BEC5;
  --accent:#F59E0B;
  --accent-hover:#FBBF24;
  --accent-dim:rgba(245,158,11,0.15);
  --accent2:#3B82F6;
  --accent2-dim:rgba(59,130,246,0.15);
  --rule:rgba(255,255,255,0.08);
  --radius:16px;
  --radius-sm:10px;
  --radius-lg:24px;
  --max-width:1200px;
  --nav-h:72px;
}

/* ====== LANGUAGE TOGGLE ====== */
body.lang-cn .en{display:none}
body.lang-en .cn{display:none}

/* ====== LAYOUT UTILS ====== */
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
section{position:relative;padding:100px 0}
.section-label{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;font-weight:600;letter-spacing:0.15em;text-transform:uppercase;
  color:var(--accent);margin-bottom:16px;
}
.section-label::before{content:'';width:32px;height:2px;background:var(--accent)}
.section-title{
  font-size:clamp(28px,4vw,42px);font-weight:800;line-height:1.2;
  margin-bottom:16px;letter-spacing:-0.02em;
}
.section-subtitle{font-size:17px;color:var(--muted);max-width:680px;margin-bottom:56px}

/* ====== BUTTONS ====== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;border-radius:50px;font-size:15px;font-weight:600;
  transition:all .3s ease;white-space:nowrap;
}
.btn-primary{background:var(--accent);color:#0B1424}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-2px);box-shadow:0 8px 30px rgba(245,158,11,0.35)}
.btn-outline{border:1.5px solid rgba(255,255,255,0.25);color:var(--ink)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:rgba(245,158,11,0.05)}
.btn-portal{
  background:rgba(255,255,255,0.08);backdrop-filter:blur(12px);
  border:1.5px solid rgba(255,255,255,0.2);color:var(--ink-bright);
  position:relative;overflow:hidden;
}
.btn-portal::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(245,158,11,0.15),rgba(59,130,246,0.15));
  opacity:0;transition:opacity .3s;
}
.btn-portal:hover{border-color:rgba(245,158,11,0.5);transform:translateY(-2px);box-shadow:0 8px 30px rgba(59,130,246,0.2)}
.btn-portal:hover::before{opacity:1}
.btn-portal span{position:relative;z-index:1}
.btn-portal .portal-icon{
  width:18px;height:18px;display:inline-flex;align-items:center;justify-content:center;
}
.btn-portal .portal-icon svg{width:18px;height:18px;stroke:var(--accent);fill:none;stroke-width:2}
.btn-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--accent);transition:gap .3s}
.btn-arrow:hover{gap:12px}

/* ====== NAVIGATION ====== */
nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1000;
  display:flex;align-items:center;
  background:rgba(6,11,20,0.6);backdrop-filter:blur(20px);
  border-bottom:1px solid transparent;
  transition:all .3s ease;
}
nav.scrolled{background:rgba(6,11,20,0.9);border-bottom-color:var(--rule)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.nav-logo{display:flex;align-items:center;gap:12px}
.logo-mark{
  width:42px;height:42px;border-radius:10px;
  background:linear-gradient(135deg,var(--accent),#D97706);
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:900;color:#0B1424;letter-spacing:-0.05em;
}
.logo-text{display:flex;flex-direction:column;line-height:1.1}
.logo-text .lt-main{font-size:17px;font-weight:800;letter-spacing:0.02em}
.logo-text .lt-sub{font-size:11px;color:var(--muted);font-weight:500}
.nav-menu{display:flex;align-items:center;gap:36px}
.nav-menu a{font-size:15px;font-weight:500;color:var(--muted-light);transition:color .2s;position:relative}
.nav-menu a:hover{color:var(--ink)}
.nav-menu a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--accent);transition:width .3s}
.nav-menu a:hover::after{width:100%}
.nav-right{display:flex;align-items:center;gap:20px}
.lang-toggle{display:flex;align-items:center;border:1px solid var(--rule);border-radius:50px;overflow:hidden}
.lang-toggle button{padding:6px 14px;font-size:13px;font-weight:600;color:var(--muted);transition:all .2s}
.lang-toggle button.active{background:var(--accent);color:#0B1424}
.nav-cta{display:inline-flex}
.mobile-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.mobile-toggle span{width:24px;height:2px;background:var(--ink);transition:all .3s}
.mobile-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.mobile-toggle.active span:nth-child(2){opacity:0}
.mobile-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ====== FOOTER ====== */
footer{background:var(--bg2);border-top:1px solid var(--rule);padding:60px 0 32px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .nav-logo{margin-bottom:16px}
.footer-brand p{font-size:14px;color:var(--muted);line-height:1.7;max-width:320px}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px;letter-spacing:0.02em}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{font-size:14px;color:var(--muted);transition:color .2s}
.footer-col ul li a:hover{color:var(--accent)}
.footer-bottom{padding-top:24px;border-top:1px solid var(--rule);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:13px;color:var(--muted)}
.footer-social{display:flex;gap:12px}
.footer-social a{width:36px;height:36px;border-radius:50%;border:1px solid var(--rule);display:flex;align-items:center;justify-content:center;transition:all .2s}
.footer-social a:hover{border-color:var(--accent);color:var(--accent)}
.footer-social svg{width:16px;height:16px;fill:currentColor}

/* ====== ANIMATIONS ====== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible{opacity:1;transform:none}
.reveal-delay-1{transition-delay:.1s}
.reveal-delay-2{transition-delay:.2s}
.reveal-delay-3{transition-delay:.3s}
.reveal-delay-4{transition-delay:.4s}

/* ====== PAGE BANNER (子页面通用顶部) ====== */
.page-banner{
  min-height:320px;display:flex;align-items:center;
  padding-top:var(--nav-h);position:relative;overflow:hidden;
  background:var(--bg2);
}
.page-banner-bg{position:absolute;inset:0;z-index:0}
.page-banner-bg img{width:100%;height:100%;object-fit:cover;opacity:0.3}
.page-banner-bg::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(6,11,20,0.6) 0%,rgba(6,11,20,0.9) 100%);
}
.page-banner-content{position:relative;z-index:1;width:100%}
.page-banner-title{
  font-size:clamp(32px,5vw,48px);font-weight:900;line-height:1.15;
  letter-spacing:-0.03em;margin-bottom:12px;
}
.page-banner-title .highlight{color:var(--accent)}
.page-banner-subtitle{font-size:18px;color:var(--muted-light);max-width:600px}
.breadcrumb{
  display:flex;align-items:center;gap:8px;
  font-size:13px;color:var(--muted);margin-bottom:20px;
}
.breadcrumb a{color:var(--muted);transition:color .2s}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{color:var(--accent)}

/* ====== PARTNERS STRIP ====== */
.partners{padding:48px 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--bg)}
.partners-label{text-align:center;font-size:13px;color:var(--muted);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:24px}
.partners-row{display:flex;flex-wrap:wrap;justify-content:center;gap:16px}
.partner-badge{
  padding:8px 20px;border:1px solid var(--rule);border-radius:50px;
  font-size:14px;font-weight:700;color:var(--muted-light);letter-spacing:0.05em;
  transition:all .3s;
}
.partner-badge:hover{border-color:var(--accent);color:var(--accent)}

/* ====== SERVICE TAGS (shared) ====== */
.service-tag{font-size:12px;font-weight:600;padding:4px 12px;border-radius:50px;background:rgba(255,255,255,0.05);color:var(--muted-light);border:1px solid var(--rule)}

/* ====== RESPONSIVE (shared) ====== */
@media(max-width:768px){
  section{padding:64px 0}
  .nav-menu{display:none}
  .mobile-toggle{display:flex}
  .nav-menu.mobile-open{
    display:flex;flex-direction:column;position:fixed;top:var(--nav-h);left:0;right:0;
    background:rgba(6,11,20,0.98);backdrop-filter:blur(20px);
    padding:32px 24px;gap:20px;border-bottom:1px solid var(--rule);
  }
  .nav-cta,.nav-portal{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
}

/* Filing numbers: keep on the same baseline and typography as footer copyright. */
.footer-bottom p .site-icp-link,.footer-bottom p .site-police-link{font:inherit;color:inherit;line-height:inherit;text-decoration:none;margin-left:14px;white-space:nowrap}
.footer-bottom p .site-icp-link:hover,.footer-bottom p .site-police-link:hover{color:inherit;text-decoration:underline}