/* 德朗驰门窗 官网样式 V2 —— 高端定制调性：墨黑 + 香槟金 + 衬线标题 */
:root{
  --ink:#14161b;
  --ink-2:#23262e;
  --gold:#a8874f;
  --gold-light:#cbb083;
  --gold-bg:#f6f1e7;
  --paper:#ffffff;
  --paper-2:#f8f7f4;
  --line:#e8e4dc;
  --text:#33363d;
  --muted:#8a8d94;
  --serif:"Songti SC","STSong","SimSun",Georgia,serif;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;color:var(--text);background:var(--paper);line-height:1.8;font-size:16px;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:1200px;margin:0 auto;padding:0 32px;}
.serif{font-family:var(--serif);}

/* ===== 头部 ===== */
.top-bar{background:var(--ink);color:rgba(255,255,255,.6);font-size:12.5px;}
.top-bar .wrap{display:flex;justify-content:space-between;height:34px;align-items:center;}
.top-bar b{color:var(--gold-light);font-weight:500;}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:78px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{width:42px;height:42px;background:var(--ink);color:var(--gold-light);display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-weight:700;font-size:20px;}
.brand-name{font-family:var(--serif);font-size:21px;font-weight:700;color:var(--ink);letter-spacing:3px;}
.brand-name small{display:block;font-family:"PingFang SC",sans-serif;font-size:9.5px;letter-spacing:4px;color:var(--muted);font-weight:400;text-transform:uppercase;}
.nav-links{display:flex;gap:34px;font-size:15px;}
.nav-links a{color:var(--text);padding:4px 0;border-bottom:2px solid transparent;transition:.2s;}
.nav-links a:hover,.nav-links a.active{color:var(--ink);border-bottom-color:var(--gold);}
.nav-tel{font-size:17px;font-weight:700;color:var(--ink);letter-spacing:1px;}
.nav-tel i{font-style:normal;font-size:11px;color:var(--muted);display:block;letter-spacing:2px;font-weight:400;}
@media(max-width:880px){.nav-links{display:none;}.top-bar .hide-m{display:none;}}

/* ===== Hero ===== */
.hero{position:relative;min-height:640px;display:flex;align-items:flex-end;background:var(--ink);overflow:hidden;}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.5;transform:scale(1.02);}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,16,20,.25) 0%,rgba(15,16,20,.55) 55%,rgba(15,16,20,.92) 100%);}
.hero-inner{position:relative;z-index:2;padding:120px 0 72px;width:100%;}
.hero-kicker{color:var(--gold-light);letter-spacing:8px;font-size:12.5px;margin-bottom:22px;text-transform:uppercase;}
.hero h1{font-family:var(--serif);color:#fff;font-size:54px;font-weight:700;line-height:1.3;letter-spacing:6px;}
.hero h1 em{font-style:normal;color:var(--gold-light);}
.hero-sub{color:rgba(255,255,255,.85);margin:24px 0 40px;font-size:16.5px;max-width:600px;}
.btn{display:inline-block;padding:15px 42px;font-size:15px;letter-spacing:3px;transition:.25s;}
.btn-gold{background:var(--gold);color:#fff;}
.btn-gold:hover{background:#94763e;transform:translateY(-1px);}
.btn-ghost{border:1px solid rgba(255,255,255,.45);color:#fff;margin-left:16px;}
.btn-ghost:hover{border-color:var(--gold-light);color:var(--gold-light);}
.hero-tags{display:flex;gap:34px;margin-top:52px;padding-top:26px;border-top:1px solid rgba(255,255,255,.18);flex-wrap:wrap;}
.hero-tag{color:rgba(255,255,255,.75);font-size:13.5px;letter-spacing:1px;}
.hero-tag b{display:block;color:var(--gold-light);font-size:20px;font-family:var(--serif);font-weight:700;letter-spacing:2px;margin-bottom:2px;}
@media(max-width:880px){.hero h1{font-size:34px;letter-spacing:3px;}.btn-ghost{margin-left:0;margin-top:14px;}.hero{min-height:560px;}}

/* ===== 直答块（GEO核心） ===== */
.direct-answer{background:var(--gold-bg);border-bottom:1px solid var(--line);}
.direct-answer .wrap{padding:30px 32px;display:flex;gap:26px;align-items:flex-start;}
.da-label{flex-shrink:0;background:var(--ink);color:var(--gold-light);font-size:11.5px;letter-spacing:3px;padding:6px 14px;margin-top:4px;}
.direct-answer p{font-size:14.5px;color:var(--text);}
.direct-answer p b{color:var(--ink);}
@media(max-width:680px){.direct-answer .wrap{flex-direction:column;gap:12px;padding:22px 24px;}}

/* ===== 数据条 ===== */
.stats{background:var(--ink);padding:70px 0;}
.stats .grid-4{gap:0;}
.stat{text-align:center;border-right:1px solid rgba(255,255,255,.1);padding:12px 0;}
.stat:last-child{border-right:none;}
.stat b{display:block;font-family:var(--serif);font-size:42px;color:var(--gold-light);font-weight:700;letter-spacing:1px;line-height:1.2;}
.stat span{color:rgba(255,255,255,.6);font-size:13px;letter-spacing:3px;}

/* ===== 区块通用 ===== */
section{padding:96px 0;}
.sec-kicker{color:var(--gold);letter-spacing:5px;font-size:12.5px;text-transform:uppercase;margin-bottom:14px;}
.sec-kicker::before{content:"";display:inline-block;width:28px;height:1px;background:var(--gold);vertical-align:middle;margin-right:12px;}
.sec-title{font-family:var(--serif);font-size:34px;font-weight:700;color:var(--ink);letter-spacing:2px;margin-bottom:16px;line-height:1.4;}
.sec-desc{color:var(--muted);max-width:660px;margin-bottom:50px;font-size:15.5px;}
.sec-alt{background:var(--paper-2);}
.center{text-align:center;}
.center .sec-kicker::before{display:none;}
.center .sec-desc{margin-left:auto;margin-right:auto;}

/* ===== 城市pills ===== */
.city-pills{display:flex;flex-wrap:wrap;gap:10px;}
.city-pill{padding:9px 22px;border:1px solid var(--line);background:#fff;font-size:14px;color:var(--text);letter-spacing:1px;transition:.2s;}
.city-pill:hover{border-color:var(--gold);}
.city-pill.hot{border-color:var(--gold);color:var(--gold);font-weight:600;background:var(--gold-bg);}

/* ===== 卡片 ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
@media(max-width:960px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}}
@media(max-width:600px){.grid-3,.grid-4{grid-template-columns:1fr;}}
.card{background:#fff;border:1px solid var(--line);padding:38px 30px;transition:.3s;position:relative;}
.card:hover{border-color:var(--gold);box-shadow:0 18px 44px rgba(20,22,27,.09);transform:translateY(-4px);}
.card .num{font-family:var(--serif);font-size:13px;color:var(--gold);letter-spacing:4px;margin-bottom:14px;}
.card h3{font-size:19px;color:var(--ink);margin-bottom:13px;letter-spacing:1px;}
.card p{font-size:14.5px;color:var(--muted);}

/* ===== 产品卡 ===== */
.product-card{background:#fff;border:1px solid var(--line);overflow:hidden;transition:.3s;display:block;}
.product-card:hover{border-color:var(--gold);box-shadow:0 18px 44px rgba(20,22,27,.09);transform:translateY(-4px);}
.product-card img{height:240px;width:100%;object-fit:cover;}
.product-body{padding:26px 24px 30px;}
.product-body h3{font-family:var(--serif);font-size:19px;color:var(--ink);margin-bottom:6px;letter-spacing:1px;}
.product-body .en{font-size:10.5px;color:var(--muted);letter-spacing:2.5px;text-transform:uppercase;margin-bottom:14px;}
.spec-row{display:flex;justify-content:space-between;font-size:13px;padding:8px 0;border-bottom:1px dashed var(--line);color:var(--muted);}
.spec-row b{color:var(--text);font-weight:500;}

/* ===== 图文左右 ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;}
@media(max-width:880px){.split{grid-template-columns:1fr;}}
.split img{width:100%;height:440px;object-fit:cover;}
.feature-list{list-style:none;margin-top:28px;}
.feature-list li{padding:14px 0;border-bottom:1px solid var(--line);display:flex;gap:16px;font-size:15px;}
.feature-list li::before{content:"—";color:var(--gold);font-weight:700;}

/* ===== 案例 ===== */
.case-card{border:1px solid var(--line);background:#fff;overflow:hidden;transition:.3s;display:block;}
.case-card:hover{border-color:var(--gold);box-shadow:0 18px 44px rgba(20,22,27,.09);transform:translateY(-4px);}
.case-card img{height:210px;width:100%;object-fit:cover;}
.case-body{padding:22px 24px 26px;}
.case-city{font-size:11.5px;color:var(--gold);letter-spacing:3px;margin-bottom:8px;}
.case-body h3{font-size:16.5px;color:var(--ink);margin-bottom:8px;letter-spacing:.5px;}
.case-body p{font-size:13.5px;color:var(--muted);}

/* ===== FAQ ===== */
.faq-item{background:#fff;border:1px solid var(--line);margin-bottom:14px;transition:.2s;}
.faq-item h3{font-size:16px;color:var(--ink);padding:20px 26px;cursor:pointer;position:relative;font-weight:500;}
.faq-item h3::before{content:"Q";font-family:var(--serif);color:var(--gold);font-weight:700;margin-right:12px;}
.faq-item h3::after{content:"+";position:absolute;right:26px;color:var(--muted);transition:.2s;}
.faq-item.open h3::after{content:"−";color:var(--gold);}
.faq-item p{padding:0 26px 20px 45px;font-size:14.5px;color:var(--muted);display:none;}
.faq-item.open p{display:block;}
.faq-item.open{border-color:var(--gold);}

/* ===== 选窗助手 ===== */
.tool-box{background:#fff;border:1px solid var(--line);padding:52px 48px;max-width:860px;margin:0 auto;box-shadow:0 24px 60px rgba(20,22,27,.06);}
.tool-q{margin-bottom:30px;}
.tool-q .q-label{font-size:14px;color:var(--ink);font-weight:600;margin-bottom:12px;letter-spacing:1px;}
.tool-q .q-label span{color:var(--gold);font-family:var(--serif);margin-right:8px;}
.tool-opts{display:flex;flex-wrap:wrap;gap:10px;}
.tool-opt{padding:10px 24px;border:1px solid var(--line);font-size:14px;cursor:pointer;transition:.2s;user-select:none;}
.tool-opt:hover{border-color:var(--gold);}
.tool-opt.sel{border-color:var(--gold);background:var(--gold-bg);color:var(--ink);font-weight:600;}
.tool-result{background:var(--ink);color:rgba(255,255,255,.85);padding:34px 36px;display:none;}
.tool-result.show{display:block;}
.tool-result h4{font-family:var(--serif);color:var(--gold-light);font-size:21px;letter-spacing:2px;margin-bottom:14px;}
.tool-result p{font-size:14.5px;margin-bottom:8px;}
.tool-result b{color:#fff;}
.tool-result .btn{margin-top:18px;}
@media(max-width:680px){.tool-box{padding:34px 24px;}}

/* ===== 口碑 ===== */
.quote-card{background:#fff;border:1px solid var(--line);padding:36px 32px;position:relative;}
.quote-card::before{content:"“";font-family:var(--serif);position:absolute;top:18px;left:24px;font-size:52px;color:var(--gold);opacity:.35;line-height:1;}
.quote-card p{font-size:14.5px;color:var(--text);margin:26px 0 18px;}
.quote-card .who{font-size:13px;color:var(--muted);}
.quote-card .who b{color:var(--ink);font-weight:600;}

/* ===== CTA ===== */
.cta{background:linear-gradient(140deg,#16181d 0%,#26232a 100%);text-align:center;position:relative;overflow:hidden;}
.cta::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse at 50% 120%,rgba(168,135,79,.22),transparent 60%);}
.cta .wrap{position:relative;}
.cta h2{font-family:var(--serif);color:#fff;font-size:32px;letter-spacing:3px;margin-bottom:16px;}
.cta p{color:rgba(255,255,255,.65);margin-bottom:32px;}
.cta .tel{font-family:var(--serif);font-size:40px;font-weight:700;color:var(--gold-light);letter-spacing:3px;display:block;margin-bottom:10px;}
.cta .tip{color:rgba(255,255,255,.4);font-size:12.5px;margin:0;}

/* ===== 页脚 ===== */
.site-footer{background:var(--ink);color:rgba(255,255,255,.6);padding:60px 0 26px;font-size:13.5px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:44px;margin-bottom:38px;}
@media(max-width:880px){.footer-grid{grid-template-columns:1fr;}}
.site-footer h4{color:#fff;font-family:var(--serif);font-size:16px;margin-bottom:18px;letter-spacing:2px;}
.site-footer a{display:block;padding:5px 0;transition:.2s;}
.site-footer a:hover{color:var(--gold-light);}
.footer-bar{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;text-align:center;color:rgba(255,255,255,.38);font-size:12.5px;letter-spacing:.5px;}

/* ===== 面包屑 ===== */
.crumb{background:var(--ink);padding:74px 0 64px;position:relative;overflow:hidden;}
.crumb::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border:1px solid rgba(203,176,131,.18);border-radius:50%;}
.crumb h1{font-family:var(--serif);color:#fff;font-size:34px;letter-spacing:3px;margin-top:10px;}
.crumb .path{color:rgba(255,255,255,.5);font-size:13px;letter-spacing:1px;}
.crumb .path a{color:var(--gold-light);}

/* ===== 表格 ===== */
.spec-table{width:100%;border-collapse:collapse;font-size:14px;background:#fff;}
.spec-table th{background:var(--ink);color:var(--gold-light);padding:13px 18px;text-align:left;font-weight:500;letter-spacing:2px;font-family:var(--serif);}
.spec-table td{padding:12px 18px;border-bottom:1px solid var(--line);color:var(--muted);}
.spec-table td:first-child{color:var(--ink);font-weight:500;}

/* ===== 步骤 ===== */
.steps{counter-reset:step;}
.step{position:relative;padding:0 0 38px 64px;}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:0;top:-4px;font-size:30px;font-weight:700;color:var(--gold);font-family:var(--serif);opacity:.85;}
.step::after{content:"";position:absolute;left:14px;top:34px;bottom:8px;width:1px;background:var(--line);}
.step:last-child::after{display:none;}
.step h3{font-size:17px;color:var(--ink);margin-bottom:7px;letter-spacing:.5px;}
.step p{font-size:14px;color:var(--muted);}

/* ===== 移动端黏性电话条 ===== */
.mobile-cta{display:none;position:fixed;bottom:0;left:0;right:0;z-index:200;background:var(--ink);padding:10px 16px calc(10px + env(safe-area-inset-bottom));box-shadow:0 -8px 24px rgba(0,0,0,.25);}
.mobile-cta a{display:flex;align-items:center;justify-content:center;gap:10px;background:var(--gold);color:#fff;font-size:16px;font-weight:700;letter-spacing:2px;padding:13px 0;}
@media(max-width:880px){.mobile-cta{display:block;}body{padding-bottom:58px;}}