/* ============================================================
   common.css - 全站公共基础样式
   加载顺序：common.css → 页面内联样式 → commercial.css
   ============================================================ */

/* CSS Reset */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{overflow-x:hidden;width:100%}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;background:#fff;color:#1a1a1a;line-height:1.8;font-size:15px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;touch-action:manipulation;overflow-x:hidden;width:100%}
a{text-decoration:none;color:inherit;transition:all .3s ease;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
img{max-width:100%;display:block;object-fit:contain;pointer-events:none}

/* CSS Variables */
:root{
  --brand:#AB1942;
  --brand-dark:#8B1435;
  --brand-light:#C42A52;
  --hero-fallback:#171113;
  --hero-fallback-soft:#26171b;
  --text:#1a1a1a;
  --text-secondary:#4a4a4a;
  --text-muted:#8a8a8a;
  --text-faint:#b0b0b0;
  --border:#e8e8e8;
  --border-light:#f0f0f0;
  --bg-gray:#f7f7f7;
  --bg-warm:#f5f3f0;
  --brand-subtle:rgba(171,25,66,.04);
  --brand-glow:rgba(171,25,66,.06);
  --bg-dark:#2a2a2a;
  --bg-darker:#1f1f1f;
  --content-max:1200px;
  --content-padding:24px;
  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:16px;
  --shadow-sm:0 2px 8px rgba(0,0,0,.04);
  --shadow-md:0 8px 24px rgba(0,0,0,.08);
  --shadow-lg:0 16px 48px rgba(0,0,0,.12);
  --transition:.3s ease;
}

/* Container */
.container{max-width:var(--content-max);margin:0 auto;padding:0 var(--content-padding)}

/* ============================================================
   Header & Navigation
   ============================================================ */
.header{position:sticky;top:0;z-index:100;background:var(--brand);box-shadow:0 2px 12px rgba(171,25,66,.15)}
.header-inner{max-width:var(--content-max);margin:0 auto;padding:0 var(--content-padding);height:64px;display:flex;align-items:center;justify-content:space-between}
.header-logo{display:flex;align-items:center;height:100%;padding:8px 12px}
.header-logo img{width:95px;height:auto;object-fit:contain;display:block}
.header-nav{display:flex;gap:32px;align-items:center}
.header-nav a{color:#fff;font-size:15px;font-weight:400;opacity:.9;position:relative}
.header-nav a:hover{opacity:1;color:#fff}
.header-nav a::after{content:'';position:absolute;bottom:-6px;left:0;width:0;height:2px;background:#fff;transition:width var(--transition);opacity:.8}
.header-nav a:hover::after{width:100%}
.header-nav a.active{opacity:1;font-weight:500}
.header-nav a.active::after{width:100%}
.nav-item-wrapper{display:inline-flex;align-items:center;gap:4px}
.nav-badge{font-size:10px;font-weight:600;background:#fff;color:#AB1942;padding:1px 5px;border-radius:8px;line-height:1.4;letter-spacing:.5px}

/* Hamburger button */
.hamburger-btn{display:none;align-items:center;justify-content:center;width:44px;height:44px;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px;padding:0;z-index:101;position:relative;-webkit-tap-highlight-color:transparent}
.hamburger-btn span{display:block;width:24px;height:2.5px;background:#fff;border-radius:2px;transition:all .3s ease;transform-origin:center;pointer-events:none}
.hamburger-btn.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.hamburger-btn.active span:nth-child(2){opacity:0}
.hamburger-btn.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* Mobile nav overlay */
.mobile-nav-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);z-index:99;opacity:0;pointer-events:none;transition:opacity .3s ease}
.mobile-nav-overlay.active{opacity:1;pointer-events:auto}

/* Mobile nav panel */
.mobile-nav{position:fixed;top:0;right:0;width:75%;max-width:300px;height:100%;background:#AB1942;z-index:100;padding:80px 24px 24px;transform:translateX(100%);transition:transform .3s ease;overflow-y:auto}
.mobile-nav-overlay.active .mobile-nav{transform:translateX(0)}

/* Mobile nav links */
.mobile-nav a{display:block;color:#fff;font-size:17px;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.12);font-weight:500;letter-spacing:.5px}
.mobile-nav a:last-child{border-bottom:none}
.mobile-nav a.active{opacity:1;font-weight:600}
.mobile-nav .nav-item-wrapper{display:block;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.12)}
.mobile-nav .nav-item-wrapper a{display:inline;padding:0;border-bottom:none}
.mobile-nav .nav-badge{font-size:10px;font-weight:600;background:#fff;color:#AB1942;padding:1px 6px;border-radius:8px;line-height:1.4;letter-spacing:.5px;margin-left:6px}

/* Commercial primary action in navigation */
.header-nav .nav-cta a{background:#fff;color:#AB1942;padding:7px 14px;border-radius:999px;font-weight:700;opacity:1;box-shadow:0 2px 8px rgba(0,0,0,.12)}
.header-nav .nav-cta a::after{display:none}
.header-nav .nav-cta a:hover{color:#AB1942;transform:translateY(-1px)}
.header-nav .nav-cta a.active{color:#AB1942;font-weight:700}
.mobile-nav .nav-cta{display:block;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.12)}
.mobile-nav .nav-cta a{display:inline-flex;align-items:center;justify-content:center;background:#fff;color:#AB1942;padding:8px 14px;border-radius:999px;font-weight:700;border-bottom:none;box-shadow:0 2px 8px rgba(0,0,0,.14)}
.mobile-nav .nav-cta a.active{color:#AB1942;font-weight:700}

/* ============================================================
   Common Section Styles
   ============================================================ */
.section{padding:82px 0}
.eyebrow{display:inline-block;color:var(--brand);font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;margin-bottom:14px}
.section-title{font-size:32px;line-height:1.35;color:var(--text);margin-bottom:12px}
.section-desc{font-size:16px;color:var(--text-muted);max-width:680px;line-height:1.9}
.section-header{text-align:center;margin-bottom:54px}
.section-header .section-title{margin-bottom:16px}

/* ============================================================
   Buttons & CTAs
   ============================================================ */
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;background:var(--brand);color:#fff;font-size:15px;font-weight:600;border-radius:999px;transition:all var(--transition);cursor:pointer;border:none}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(171,25,66,.25)}
.btn-secondary{display:inline-flex;align-items:center;gap:8px;padding:11px 26px;background:transparent;color:var(--brand);font-size:15px;font-weight:600;border-radius:999px;border:1.5px solid var(--brand);transition:all var(--transition);cursor:pointer}
.btn-secondary:hover{background:var(--brand);color:#fff}

/* ============================================================
   CTA Section (common closing block)
   ============================================================ */
.cta-section{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-dark) 100%);color:#fff;padding:56px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px}
.cta-inner h2{font-size:30px;margin-bottom:8px}
.cta-inner p{color:rgba(255,255,255,.82);font-size:16px}
.cta-btn{background:#fff;color:var(--brand);padding:13px 28px;border-radius:999px;font-weight:700;white-space:nowrap;display:inline-flex;align-items:center;gap:8px;cursor:pointer;border:none;font-size:15px;transition:all var(--transition)}
.cta-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.15)}

/* ============================================================
   Footer
   ============================================================ */
.footer{background:var(--bg-dark);color:#fff;padding:28px 0 16px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.footer-logo{width:55px;height:auto;filter:brightness(0) invert(1);opacity:.9;object-fit:contain}
.footer-right{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer-links a,.footer-email,.footer-email a{font-size:13px;color:var(--text-faint)}
.footer-bottom{padding-top:14px;margin-top:14px;border-top:1px solid rgba(255,255,255,.08);text-align:center;font-size:11px;color:var(--text-muted)}

/* Footer WeChat QR (new common layout) */
.footer-wechat{display:flex;align-items:center;gap:12px;min-width:210px;cursor:pointer}
.footer-wechat:focus-visible{outline:2px solid rgba(255,255,255,.7);outline-offset:4px;border-radius:4px}
.footer-wechat-qr{width:82px;height:82px;display:block;object-fit:contain;background:#fff;padding:4px;border:1px solid rgba(255,255,255,.25);border-radius:3px;box-sizing:border-box}
.footer-wechat-copy{display:flex;flex-direction:column;gap:4px;max-width:150px}
.footer-wechat-copy strong{font-size:13px;line-height:1.5;color:#fff;font-weight:600}
.footer-wechat-copy span{font-size:11px;line-height:1.6;color:rgba(255,255,255,.64)}

/* ============================================================
   WeChat Popover
   ============================================================ */
.wechat-popover{position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);background:#fff;border-radius:8px;padding:14px;box-shadow:0 8px 32px rgba(0,0,0,.12);z-index:200;opacity:0;pointer-events:none;transition:all .25s ease;white-space:nowrap;text-align:center}
.wechat-popover.show{opacity:1;pointer-events:auto;top:calc(100% + 6px)}
.wechat-popover img{width:130px;height:130px;object-fit:contain;border-radius:4px}
.wechat-popover p{font-size:12px;color:var(--text-secondary);margin-top:8px;line-height:1.5}
.wechat-popover::before{content:'';position:absolute;top:-6px;left:50%;transform:translateX(-50%) rotate(45deg);width:12px;height:12px;background:#fff;box-shadow:-2px -2px 4px rgba(0,0,0,.04)}

/* WeChat overlay card (mobile) */
.wechat-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .3s ease;padding:24px}
.wechat-overlay.show{opacity:1;pointer-events:auto}
.wechat-overlay.hidden{display:none}
.wechat-overlay-card{background:#fff;border-radius:12px;padding:28px 24px;text-align:center;max-width:320px;width:100%;position:relative}
.wechat-overlay-card h3{font-size:18px;margin-bottom:4px;color:var(--text)}
.wechat-overlay-card p{font-size:13px;color:var(--text-muted);margin-bottom:16px}
.wechat-overlay-card img{width:200px;height:200px;margin:0 auto 16px;object-fit:contain;border-radius:8px}
.wechat-overlay-close{position:absolute;top:12px;right:12px;width:32px;height:32px;border:none;background:none;font-size:20px;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center}
.wechat-popover-fixed{background:#fff;border-radius:16px;padding:28px 24px;box-shadow:0 16px 48px rgba(0,0,0,.3);text-align:center;position:relative;max-width:280px;width:90%}
.wechat-popover-fixed img{width:220px;height:220px;display:block;border-radius:8px;margin:0 auto;object-fit:contain}
.wechat-popover-fixed .official-wechat-qr{width:240px;height:240px}
.wechat-popover-fixed .wechat-popover-label{display:block;text-align:center;font-size:13px;color:#6b7280;margin-top:12px}
.wechat-close{position:absolute;top:8px;right:8px;font-size:22px;color:#9ca3af;background:none;border:none;cursor:pointer;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;line-height:1;transition:all .2s}
.wechat-close:hover{background:#f3f4f6;color:#374151}

/* Keep WeChat QR images touchable on mobile so users can long-press to scan/save. */
.wechat-popover-fixed img,.wechat-popover img,.wechat-overlay-card img,.service-popover-box img,.footer-wechat-qr{pointer-events:auto!important;-webkit-touch-callout:default!important;-webkit-user-select:auto!important;user-select:auto!important;touch-action:auto!important;-webkit-user-drag:auto!important}

/* ============================================================
   Card Components (shared base)
   ============================================================ */
.service-card,.case-card,.team-card,.expert-card,.domain-card,.system-card,.position-card,.value-card,.article-card,.featured-card,.practice-card{
  border:1px solid var(--border);border-radius:var(--radius-md);background:#fff;transition:all var(--transition)
}
.service-card:hover,.case-card:hover,.expert-card:hover,.article-card:hover,.practice-card:hover{
  transform:translateY(-3px);box-shadow:var(--shadow-lg)
}

/* ============================================================
   Mobile Responsive (common breakpoints)
   ============================================================ */
@media(max-width:900px){
  .section{padding:64px 0}
  .section-title{font-size:28px}
  .cta-inner{flex-direction:column;align-items:flex-start;gap:20px}
  .cta-btn{width:100%;justify-content:center}
}

@media(max-width:767px){
  :root{--content-padding:20px}
  .header-inner{height:56px;padding:0 20px}
  .header-logo img{width:80px}
  .header-nav{display:none}
  .hamburger-btn{display:flex}

  .section{padding:56px 0}
  .section-title{font-size:27px}
  .section-header{margin-bottom:36px}
  .section-desc{font-size:15px}

  .cta-section{padding:44px 0}
  .cta-inner h2{font-size:24px}
  .cta-inner p{font-size:14px}
  .cta-btn{width:100%;justify-content:center}

  .footer-inner,.footer-right{flex-direction:column;align-items:flex-start;gap:14px}
  .footer-links{gap:14px}
  .footer .footer-right{width:100%;grid-template-columns:1fr;grid-template-areas:"links" "email" "wechat";row-gap:16px}
  .footer-wechat{min-width:0;margin-top:2px}
  .footer-wechat-qr{width:76px;height:76px}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}