/* =========================================================
   上海声洋建筑科技有限公司 — 官网样式（高级 / 大气 版）
   ========================================================= */

/* ===== 设计令牌 ===== */
:root{
  --ink:#191e24;            /* 深炭灰 主色 */
  --ink-2:#232930;
  --ink-3:#2f363e;
  --paper:#f7f5f1;          /* 暖白底 */
  --paper-2:#efebe4;
  --gold:#c9a45c;           /* 暖金 强调 */
  --gold-l:#dfc288;         /* 亮金（渐变/高亮） */
  --gold-d:#a9853c;         /* 深金（文字） */
  --text:#2b3037;
  --muted:#6d737b;
  --line:#e3ddd2;
  --maxw:1200px;
  --r-sm:10px;
  --r:16px;
  --r-lg:20px;
  --sh-1:0 1px 2px rgba(25,30,36,.04), 0 8px 24px rgba(25,30,36,.05);
  --sh-2:0 2px 8px rgba(25,30,36,.06), 0 20px 48px rgba(25,30,36,.10);
  --ease:cubic-bezier(.22,.61,.36,1);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,SimSun,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--text);
  background:#fff;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
::selection{background:var(--gold);color:#fff}
a{color:inherit;text-decoration:none}
img{max-width:100%}

/* ===== 导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:rgba(25,30,36,.88);backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.07);box-shadow:0 1px 0 rgba(201,164,92,.12)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;height:72px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-mark{font-family:var(--serif);font-weight:700;color:var(--gold-l);border:1px solid rgba(201,164,92,.55);
  padding:4px 11px;border-radius:6px;font-size:14px;letter-spacing:2px}
.brand-name{font-size:15px;font-weight:600;letter-spacing:1px}
.nav-links{display:flex;gap:30px}
.nav-links a{color:#c3c8ce;font-size:14.5px;letter-spacing:.5px;transition:color .25s;position:relative;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--gold);transition:right .3s var(--ease)}
.nav-links a:hover{color:#fff}
.nav-links a:hover::after{right:0}
.nav-toggle{display:none;background:none;border:0;color:#fff;font-size:24px;cursor:pointer}

/* ===== Hero ===== */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;
  background:linear-gradient(160deg,#191e24 0%,#232930 45%,#302b21 100%);overflow:hidden}
/* 建筑网格纹理 */
.hero-grid{position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(ellipse 80% 70% at 50% 45%,#000 30%,transparent 75%);
  mask-image:radial-gradient(ellipse 80% 70% at 50% 45%,#000 30%,transparent 75%)}
.hero-overlay{position:absolute;inset:0;background:
  radial-gradient(circle at 22% 24%,rgba(201,164,92,.20),transparent 42%),
  radial-gradient(circle at 78% 78%,rgba(168,88,74,.14),transparent 46%)}
.hero-content{position:relative;z-index:2;padding:0 24px;max-width:940px}
.hero h1{font-family:var(--serif);font-size:clamp(34px,6.2vw,66px);font-weight:700;line-height:1.2;letter-spacing:3px}
.hero-rule{display:block;width:56px;height:2px;background:linear-gradient(90deg,var(--gold),rgba(201,164,92,0));margin:28px auto}
.hero-tag{color:#c9c2b3;letter-spacing:4px;font-size:13.5px;margin-bottom:18px;line-height:2.1}
.hero-tag span{white-space:nowrap}
.hero-sub{margin:14px auto 36px;font-size:clamp(15px,1.9vw,19px);color:#c2c7cd;max-width:660px;line-height:1.9;letter-spacing:.5px}
.hero-btns{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 36px;border-radius:var(--r-sm);font-weight:600;font-size:15px;letter-spacing:2px;
  transition:transform .25s var(--ease),background .25s,color .25s,border-color .25s,box-shadow .25s;cursor:pointer;border:1px solid transparent}
.btn-gold{background:linear-gradient(135deg,var(--gold-l),var(--gold));color:#1a1f25;box-shadow:0 10px 26px rgba(201,164,92,.28)}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(201,164,92,.38)}
.btn-ghost{border-color:rgba(255,255,255,.3);color:#fff}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-l);transform:translateY(-2px)}
.hero-scroll{position:absolute;left:50%;bottom:34px;transform:translateX(-50%);z-index:2;font-size:12px;letter-spacing:3px;color:rgba(255,255,255,.55);display:flex;flex-direction:column;align-items:center;gap:8px}
.hero-scroll::after{content:"";width:1px;height:38px;background:linear-gradient(180deg,rgba(201,164,92,.9),transparent);animation:scrollLine 2.2s var(--ease) infinite}
@keyframes scrollLine{0%{transform:scaleY(.3);transform-origin:top;opacity:.4}50%{transform:scaleY(1);opacity:1}100%{transform:scaleY(.3);transform-origin:bottom;opacity:.4}}

/* ===== 通用区块 ===== */
.section{padding:112px 0}
.section-alt{background:var(--paper)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section-title{font-family:var(--serif);font-size:clamp(26px,3.6vw,40px);color:var(--ink);letter-spacing:2px;margin-bottom:16px;font-weight:700}
.section-title::after{content:"";display:block;width:46px;height:2px;background:var(--gold);margin-top:20px}
.sub-title{font-family:var(--serif);font-size:19px;color:var(--ink-2);margin:52px 0 22px;letter-spacing:1px;display:flex;align-items:center;gap:12px}
.sub-title::before{content:"";width:18px;height:1px;background:var(--gold)}
.section-lead{color:var(--muted);max-width:800px;margin-bottom:48px;font-size:16px;line-height:1.95}

/* ===== 公司介绍 ===== */
.about-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:56px;align-items:center}
.about-text p{margin-bottom:18px;color:#454b53;line-height:1.95}
.stats{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.stats li{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px 18px;text-align:center;
  box-shadow:var(--sh-1);transition:transform .3s var(--ease),box-shadow .3s}
.stats li:hover{transform:translateY(-4px);box-shadow:var(--sh-2)}
.stats strong{display:block;font-family:var(--serif);font-size:42px;color:var(--gold-d);font-weight:700;letter-spacing:1px;line-height:1.1}
.stats span{font-size:13px;color:var(--muted);letter-spacing:1px}

/* ===== 动态列表 ===== */
.news-list{display:flex;flex-direction:column;gap:18px}
.news-item{background:#fff;border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:var(--r);
  padding:22px 26px;box-shadow:var(--sh-1);transition:box-shadow .3s var(--ease),transform .3s var(--ease)}
.news-item:hover{box-shadow:var(--sh-2);transform:translateX(4px)}
.news-date{display:inline-block;font-size:12px;color:var(--gold-d);background:var(--paper-2);padding:3px 12px;border-radius:999px;margin-bottom:10px;letter-spacing:1px}
.news-item h4{font-family:var(--serif);font-size:18px;color:var(--ink);margin-bottom:8px;letter-spacing:.5px}
.news-item p{color:var(--muted);font-size:14px;line-height:1.85}
.loading{color:var(--muted)}

/* ===== 业务介绍 ===== */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.biz-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:34px 28px;box-shadow:var(--sh-1);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s}
.biz-card:hover{transform:translateY(-6px);box-shadow:var(--sh-2);border-color:rgba(201,164,92,.45)}
.biz-card-wide{grid-column:span 2;background:linear-gradient(135deg,#fff,#faf5ec);border-color:rgba(201,164,92,.35)}
.biz-icon{width:54px;height:54px;border-radius:14px;background:linear-gradient(135deg,var(--ink),var(--ink-3));
  color:var(--gold-l);display:flex;align-items:center;justify-content:center;font-family:var(--serif);
  font-size:23px;font-weight:700;margin-bottom:20px;box-shadow:0 8px 18px rgba(25,30,36,.22)}
.biz-card h3{font-family:var(--serif);font-size:21px;color:var(--ink);margin-bottom:10px;letter-spacing:1px}
.biz-card p{color:var(--muted);font-size:14px;line-height:1.85}
.sub-tags{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}
.sub-tag{background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:13px;padding:7px 20px;border-radius:999px;letter-spacing:2px;transition:border-color .25s,color .25s}
.sub-tag:hover{border-color:var(--gold);color:var(--gold-d)}

/* ===== 成果案例 ===== */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.gallery-item{aspect-ratio:4/3;border-radius:var(--r);overflow:hidden;position:relative;
  background:linear-gradient(150deg,var(--ink-2),var(--ink-3));border:1px solid rgba(255,255,255,.07);
  display:flex;align-items:center;justify-content:center;text-align:center;padding:24px;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.gallery-item:hover{transform:translateY(-5px);box-shadow:var(--sh-2)}
.gallery-item span{position:relative;z-index:2;color:#d5d9de;font-size:14px;letter-spacing:1.5px;line-height:1.8}
.gallery-item::after{content:"";position:absolute;left:50%;bottom:26px;transform:translateX(-50%);width:28px;height:1px;background:var(--gold)}
.gallery-item::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 70% 20%,rgba(201,164,92,.16),transparent 55%)}

/* ===== 合作品牌 ===== */
.brand-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.brand-logo{flex-direction:column;gap:12px;background:#fff;border:1px solid var(--line);border-radius:var(--r);
  padding:24px 14px;display:flex;align-items:center;justify-content:center;box-shadow:var(--sh-1);
  transition:transform .3s var(--ease),box-shadow .3s,border-color .3s}
.brand-logo:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:rgba(201,164,92,.45)}
.brand-logo img{max-width:100%;max-height:56px;object-fit:contain;opacity:.92;transition:opacity .25s}
.brand-logo:hover img{opacity:1}
.brand-logo span{font-size:13px;color:var(--ink-2);text-align:center;line-height:1.5;letter-spacing:.5px}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
.contact-info p{margin-bottom:14px;color:#454b53;font-size:15px}
.contact-info strong{color:var(--ink);letter-spacing:.5px}
.contact-info a{color:var(--gold-d);border-bottom:1px solid rgba(169,133,60,.3);transition:border-color .25s}
.contact-info a:hover{border-color:var(--gold-d)}
.kf-status{margin-top:20px;padding:16px 20px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);font-size:14px;color:#454b53}
.kf-status b{color:var(--gold-d)}
.kf-wechat{margin-top:20px}
.kf-wechat-t{display:block;font-size:14px;color:#454b53;margin-bottom:10px;letter-spacing:1px}
.kf-qr{width:136px;height:136px;border:1px solid var(--line);border-radius:var(--r-sm);background:#fff;padding:6px;box-shadow:var(--sh-1);overflow:hidden}
.kf-qr img{width:100%;height:100%;object-fit:cover;border-radius:6px}
.kf-wechat small{display:block;margin-top:10px;color:var(--muted);font-size:12px;letter-spacing:.5px}
.contact-form{display:flex;flex-direction:column;gap:14px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:30px;box-shadow:var(--sh-1)}
.contact-form input,.contact-form textarea{width:100%;padding:13px 16px;border:1px solid var(--line);border-radius:var(--r-sm);
  font-size:14px;font-family:inherit;background:var(--paper);color:var(--text);transition:border-color .25s,box-shadow .25s,background .25s}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--gold);background:#fff;box-shadow:0 0 0 3px rgba(201,164,92,.14)}
.contact-form .btn-gold{width:100%;margin-top:4px}
.form-tip{font-size:12px;color:var(--muted)}

/* ===== 在线客服 ===== */
.kf-wrap{position:fixed;right:22px;bottom:24px;z-index:60;display:flex;flex-direction:column;align-items:flex-end;gap:12px}
.kf-fab{display:flex;align-items:center;gap:9px;background:linear-gradient(135deg,var(--gold-l),var(--gold));color:#1a1f25;
  border:0;border-radius:999px;padding:13px 20px;font-size:15px;font-weight:600;letter-spacing:1px;cursor:pointer;
  box-shadow:0 10px 28px rgba(201,164,92,.34);transition:transform .2s var(--ease),box-shadow .2s}
.kf-fab:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(201,164,92,.45)}
.kf-fab-ico{font-size:17px}
.kf-pop{width:244px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--sh-2);text-align:center}
.kf-pop-title{font-size:15px;color:var(--ink);margin-bottom:4px}
.kf-pop-title span{color:var(--gold-d);font-weight:700}
.kf-pop-tip{font-size:12px;color:var(--muted);margin-bottom:14px}
.kf-pop-btn{display:block;width:100%;margin-top:10px;padding:11px;border-radius:var(--r-sm);font-size:14px;font-weight:600;cursor:pointer;border:1px solid transparent;letter-spacing:1px}
.kf-link{background:none;border:1px solid var(--line);color:var(--ink-2);transition:border-color .25s,color .25s}
.kf-link:hover{border-color:var(--gold);color:var(--gold-d)}

/* ===== 页脚 ===== */
.footer{background:var(--ink);color:#aeb4bb;padding:60px 0 44px;text-align:center;border-top:1px solid rgba(201,164,92,.2)}
.footer .f-brand{font-family:var(--serif);font-size:18px;color:#e8eaec;letter-spacing:3px;margin-bottom:10px}
.footer .f-line{width:40px;height:1px;background:rgba(201,164,92,.5);margin:18px auto}
.footer p{font-size:13px;letter-spacing:.5px}
.f-biz .nb{white-space:nowrap}
.footer-small{font-size:12px;color:#8b919a;margin-top:8px}
.footer .icp{color:#aeb4bb;text-decoration:none;border-bottom:1px solid rgba(174,180,187,.35);transition:color .25s}
.footer .icp:hover{color:var(--gold-l)}

/* ===== 响应式 ===== */
/* 平板（竖屏/小尺寸横屏） */
@media(max-width:1024px){
  .section{padding:88px 0}
  .biz-grid{grid-template-columns:repeat(2,1fr)}
  .biz-card-wide{grid-column:span 2}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .brand-grid{grid-template-columns:repeat(3,1fr)}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:36px}
}
@media(max-width:860px){
  .nav-inner{height:62px}
  .nav-links{position:fixed;top:62px;right:0;width:230px;background:var(--ink);flex-direction:column;gap:0;padding:10px 0;
    transform:translateX(110%);transition:transform .3s var(--ease);border-radius:0 0 0 14px;box-shadow:-10px 20px 40px rgba(0,0,0,.25)}
  .nav-links.open{transform:translateX(0)}
  .nav-links a{padding:14px 26px;display:block}
  .nav-toggle{display:block}
  .section{padding:72px 0}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .biz-grid{grid-template-columns:1fr 1fr}
  .biz-card-wide{grid-column:span 2}
  .gallery,.brand-grid{grid-template-columns:repeat(2,1fr)}
  .hero{min-height:86vh}
  .hero-scroll{display:none}
}
@media(max-width:520px){
  .biz-grid,.gallery,.brand-grid{grid-template-columns:1fr}
  .biz-card-wide{grid-column:span 1}
  .stats{grid-template-columns:1fr 1fr}
  .hero-tag{font-size:12.5px;letter-spacing:2px}
  .hero h1{letter-spacing:1.5px}
  .section{padding:60px 0}
  .brand-name{font-size:13.5px}
  .f-biz{font-size:12px;letter-spacing:0}
  .contact-form{padding:22px}
}