/* ============================================
   山乙建设 · 现代线条风格
   ============================================ */

/* --- Reset --- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;
  font-size:16px;line-height:1.6;color:#1a1a1a;background:#fff;
  -webkit-font-smoothing:antialiased
}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}

/* --- Container --- */
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* --- Text Utilities --- */
.text-center{text-align:center}
.mt-40{margin-top:40px}

/* ============================================
   NAV
   ============================================ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:#fff;border-bottom:2px solid #1a1a1a;
  height:90px
}
.nav-inner{
  max-width:1200px;margin:0 auto;padding:0 24px;
  display:flex;justify-content:space-between;align-items:center;
  height:100%
}
.nav-logo{
  font-size:22px;font-weight:800;letter-spacing:4px;
  color:#1a1a1a
}
.nav-links{display:flex;gap:32px}
.nav-links a{
  font-size:13px;font-weight:600;letter-spacing:1.5px;
  color:#888;position:relative;padding:4px 0;transition:color .2s
}
.nav-links a:hover,
.nav-links a.active{color:#1a1a1a}
.nav-links a::after{
  content:'';position:absolute;bottom:-12px;left:0;right:0;
  height:2px;background:#1a1a1a;
  transform:scaleX(0);transition:transform .2s
}
.nav-links a:hover::after,
.nav-links a.active::after{transform:scaleX(1)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:#1a1a1a}

/* ============================================
   HERO
   ============================================ */
.hero{
  min-height:100vh;
  display:flex;align-items:center;justify-content:center;
  color:#1a1a1a;text-align:center;
  padding:120px 24px 60px;
  position:relative;overflow:hidden
}
.hero-bg{
  position:absolute;inset:0;
  background:url('../images/hero_bg.webp') center/cover no-repeat;
  opacity:.08
}
.hero::after{
  content:'';position:absolute;inset:0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 80px, rgba(0,0,0,.03) 80px, rgba(0,0,0,.03) 81px),
    repeating-linear-gradient(90deg, transparent, transparent 80px, rgba(0,0,0,.03) 80px, rgba(0,0,0,.03) 81px);
}
.hero-content{position:relative;z-index:1}
.hero-title{
  font-size:clamp(36px,6vw,72px);
  font-weight:800;letter-spacing:-1px;line-height:1.1
}
.hero-sub{
  font-size:clamp(14px,2vw,18px);
  color:rgba(0,0,0,.6);
  margin-top:16px;letter-spacing:4px;font-weight:300
}
.hero-line{
  width:60px;height:3px;background:#1a1a1a;
  margin:28px auto
}

/* ============================================
   BUTTONS
   ============================================ */
.btn{
  display:inline-block;padding:14px 36px;
  font-size:13px;font-weight:600;letter-spacing:2px;
  cursor:pointer;transition:all .3s
}
.btn-outline{
  border:2px solid #1a1a1a;color:#1a1a1a;background:transparent
}
.btn-outline:hover{background:#1a1a1a;color:#fff}
.btn-white{
  border:2px solid #fff;color:#1a1a1a;background:#fff
}
.btn-white:hover{background:transparent;color:#fff}
.btn-dark{
  border:2px solid #1a1a1a;color:#fff;background:#1a1a1a
}
.btn-dark:hover{background:transparent;color:#1a1a1a}

/* ============================================
   STATS
   ============================================ */
.stats{background:#fff;border-bottom:2px solid #1a1a1a}
.stats-inner{
  max-width:1000px;margin:0 auto;padding:40px 24px;
  display:flex;justify-content:space-around;align-items:center
}
.stat-item{text-align:center;flex:1}
.stat-num{
  display:block;font-size:clamp(28px,4vw,48px);
  font-weight:800;color:#1a1a1a;line-height:1
}
.stat-label{
  display:block;font-size:12px;color:#888;
  letter-spacing:2px;margin-top:8px;font-weight:500
}
.stat-divider{width:1px;height:50px;background:#ddd}

/* ============================================
   SECTION
   ============================================ */
.section{padding:80px 0}
.section-dark{background:#f5f5f5}
.section-header{margin-bottom:48px}
.section-tag{
  font-size:11px;font-weight:700;letter-spacing:3px;
  color:#bbb;display:block;margin-bottom:8px
}
.section-title{
  font-size:clamp(24px,3vw,36px);
  font-weight:800;letter-spacing:-.5px;line-height:1.2
}
.section-line{
  width:50px;height:3px;background:#1a1a1a;
  margin-top:12px
}
.section-line.center{margin-left:auto;margin-right:auto}

/* ============================================
   ABOUT BRIEF
   ============================================ */
.about-brief{
  display:grid;grid-template-columns:1fr 1fr;
  gap:60px;align-items:center
}
.about-text p{font-size:15px;color:#555;margin-bottom:16px;line-height:1.8}
/* about-image uses direct img tag now */

/* ============================================
   CASE GRID
   ============================================ */
.case-grid{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:4px
}
.case-card{
  position:relative;overflow:hidden;
  aspect-ratio:4/3;display:block;
  background:#e0e0e0
}
.case-img{
  width:100%;height:100%;overflow:hidden
}
.case-img img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .4s
}
.case-card:hover .case-img img{transform:scale(1.05)}
.case-info{
  position:absolute;bottom:0;left:0;right:0;
  padding:20px;background:linear-gradient(transparent,rgba(0,0,0,.7));
  color:#fff
}
.case-info h3{font-size:16px;font-weight:600}
.case-info span{font-size:12px;opacity:.7}


/* ============================================
   SERVICES
   ============================================ */
.service-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:24px
}
.service-card{
  border:1px solid #e0e0e0;padding:32px 24px;
  transition:border-color .3s
}
.service-card:hover{border-color:#1a1a1a}
.service-icon{
  font-size:24px;font-weight:800;color:#ddd;
  margin-bottom:16px
}
.service-card h3{
  font-size:16px;font-weight:600;margin-bottom:8px
}
.service-card p{font-size:13px;color:#888;line-height:1.7}

/* ============================================
   CTA
   ============================================ */
.cta-section{
  background:#1a1a1a;color:#fff;
  padding:80px 0
}
.cta-title{
  font-size:clamp(22px,3vw,36px);
  font-weight:700;letter-spacing:-.5px
}
.cta-text{
  font-size:15px;color:rgba(255,255,255,.6);
  margin:20px 0 32px;letter-spacing:2px
}

/* ============================================
   FOOTER
   ============================================ */
.footer{
  background:#1a1a1a;color:rgba(255,255,255,.5);
  padding:60px 0 0
}
.footer-grid{
  display:grid;grid-template-columns:auto 1fr;
  gap:60px;padding-bottom:40px;align-items:start
}
.footer-logo{display:block}
.footer-right{
  display:flex;flex-direction:column;
  align-items:flex-end;gap:4px
}
.footer-right .footer-links,
.footer-right .footer-contact{text-align:right}
.footer-links a{text-align:right}
.footer-links h4,
.footer-contact h4{
  font-size:13px;font-weight:600;letter-spacing:2px;
  color:#fff;margin-bottom:16px
}
.footer-links a{
  display:block;font-size:13px;padding:4px 0;transition:color .2s
}
.footer-links a:hover{color:#fff}
.footer-contact p{font-size:13px;padding:4px 0}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:20px 0;text-align:center;
  font-size:12px
}

/* ============================================
   INNER PAGE HERO
   ============================================ */
.page-hero{
  background:#1a1a1a;color:#fff;
  padding:150px 0 60px;text-align:center
}
.page-hero h1{
  font-size:clamp(28px,4vw,48px);
  font-weight:800;letter-spacing:-.5px
}
.page-hero p{
  font-size:14px;color:rgba(255,255,255,.5);
  margin-top:12px;letter-spacing:2px
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-full{padding:80px 0}
.about-content{max-width:800px;margin:0 auto}
.about-content p{
  font-size:15px;color:#555;line-height:2;
  margin-bottom:20px
}
.about-highlight{
  background:#f5f5f5;padding:40px;
  margin-top:40px;border-left:4px solid #1a1a1a
}
.about-highlight h3{font-size:16px;font-weight:600;margin-bottom:12px}
.about-highlight ul li{
  font-size:14px;color:#555;padding:6px 0;
  padding-left:20px;position:relative
}
.about-highlight ul li::before{
  content:'—';position:absolute;left:0;color:#1a1a1a
}

/* ============================================
   CASES PAGE (case list)
   ============================================ */
.cases-page{padding:80px 0}
.cases-list{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}
.case-item{
  aspect-ratio:4/3;background:#e0e0e0;
  position:relative;overflow:hidden;display:block
}
.case-item .case-img-bg{
  width:100%;height:100%;overflow:hidden
}
.case-item .case-img-bg img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .4s
}
.case-item:hover .case-img-bg img{transform:scale(1.05)}
.case-item .case-overlay{
  position:absolute;bottom:0;left:0;right:0;
  padding:20px;background:linear-gradient(transparent,rgba(0,0,0,.7));
  color:#fff
}
.case-item .case-overlay h3{font-size:15px;font-weight:600}
.case-item .case-overlay span{font-size:11px;opacity:.7}

/* ============================================
   TEAM PAGE
   ============================================ */
.team-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:32px;padding:80px 0
}
.team-card{text-align:center}
.team-photo{
  width:100%;aspect-ratio:1;
  background:#e0e0e0;margin-bottom:16px;
  display:flex;align-items:flex-end;justify-content:center;
  overflow:hidden
}

/* ============================================
   HONOR / AWARDS
   ============================================ */
.honor-year{margin-bottom:36px}
.honor-year-title{
  font-size:20px;font-weight:700;margin-bottom:12px;
  padding-bottom:8px;border-bottom:2px solid #1a1a1a;
  display:inline-block
}
.honor-list{list-style:none}
.honor-list li{
  font-size:14px;color:#555;padding:6px 0;
  padding-left:24px;position:relative;line-height:1.7
}
.honor-list li::before{
  content:'▸';position:absolute;left:4px;color:#1a1a1a;font-weight:700
}
.team-card h3{font-size:16px;font-weight:600}
.team-card .role{font-size:12px;color:#888;letter-spacing:1px;margin-top:4px}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-page{padding:80px 0}
.contact-grid{
  display:grid;grid-template-columns:1fr 1fr;
  gap:60px
}
.contact-info h3{
  font-size:16px;font-weight:600;margin-bottom:24px
}
.contact-info .info-item{
  display:flex;gap:12px;margin-bottom:20px;
  font-size:14px;color:#555
}
.contact-info .info-item .icon{font-size:20px;flex-shrink:0}
.contact-form-group{margin-bottom:20px}
.contact-form-group label{
  display:block;font-size:12px;font-weight:600;
  letter-spacing:1px;margin-bottom:6px;color:#888
}
.contact-form-group input,
.contact-form-group textarea{
  width:100%;padding:12px 16px;
  border:1px solid #ddd;font-size:14px;
  font-family:inherit;transition:border-color .2s;
  outline:none;background:#fff
}
.contact-form-group input:focus,
.contact-form-group textarea:focus{border-color:#1a1a1a}
.contact-form-group textarea{resize:vertical;min-height:120px}

/* ============================================
   RESPONSIVE
   ============================================ */
@media(max-width:968px){
  .about-brief{grid-template-columns:1fr;gap:32px}
  .service-grid{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr;gap:40px}
  .cases-list{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-right{align-items:flex-start}
  .footer-right .footer-links,
  .footer-right .footer-contact{text-align:left}
}

@media(max-width:768px){
  .nav-links{
    display:none;position:absolute;top:90px;left:0;right:0;
    background:#fff;border-bottom:2px solid #1a1a1a;
    flex-direction:column;padding:16px 24px;gap:16px
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .stats-inner{flex-wrap:wrap;gap:24px}
  .stat-item{width:45%;flex:none}
  .stat-divider{display:none}
  .case-grid{grid-template-columns:1fr}
  .case-grid .case-card:first-child{grid-column:auto}
  .service-grid{grid-template-columns:1fr}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .cases-list{grid-template-columns:1fr}
}

/* ============================================
   PRICE TABLE
   ============================================ */
.price-table{width:100%;border-collapse:collapse}
.price-table tr{border-bottom:1px solid #e0e0e0}
.price-table td{padding:16px 12px;font-size:14px;color:#555}
.price-table .price{text-align:right;font-weight:700;color:#1a1a1a;white-space:nowrap}
.price-table tr:last-child{border:none}