/* 世奇科技 · 服务落地页通用样式 */
:root{
  --paper:#f7f4ee; --card:#fffdf9; --ink:#1b1e24; --ink2:#5a5f6a; --ink3:#8b909a;
  --blue:#1f4b7a; --blue-deep:#16324f; --gold:#b08d57; --line:#e2dcd0;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",Georgia,serif;
  --sans:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.85}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}

/* 顶栏 */
.top{position:sticky;top:0;z-index:50;background:rgba(247,244,238,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:12px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand img{width:30px;height:30px;border-radius:6px;object-fit:cover}
.brand b{font-family:var(--serif);font-size:16px;letter-spacing:.04em;white-space:nowrap}
.brand span{font-size:11px;color:var(--ink3);letter-spacing:.14em;display:block;line-height:1.2}
.top nav{display:flex;gap:18px;font-size:13.5px;color:var(--ink2)}
.top nav a:hover{color:var(--blue)}
.top .tel{display:inline-flex;align-items:center;gap:6px;background:var(--blue);color:#fff;border-radius:999px;padding:8px 15px;font-size:13px;font-weight:700;white-space:nowrap}
.top .tel svg{flex:none}

/* 首屏 */
.hero{padding:64px 0 48px;border-bottom:1px solid var(--line);background:
  radial-gradient(1100px 420px at 82% -10%,rgba(31,75,122,.10),transparent 60%),
  radial-gradient(680px 300px at 4% 110%,rgba(176,141,87,.10),transparent 62%)}
.kicker{font-size:11px;letter-spacing:.4em;color:var(--gold);font-weight:700;margin-bottom:16px}
.hero h1{font-family:var(--serif);font-size:clamp(27px,4.6vw,42px);line-height:1.35;letter-spacing:.02em;font-weight:700}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero .lead{margin-top:18px;font-size:16px;color:var(--ink2);max-width:660px}
.tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}
.tags span{font-size:12.5px;color:var(--blue);border:1px solid rgba(31,75,122,.25);background:#fff;border-radius:999px;padding:5px 13px}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:13px 24px;font-size:14.5px;font-weight:700;transition:.2s}
.btn.primary{background:var(--blue);color:#fff}
.btn.primary:hover{background:var(--blue-deep)}
.btn.ghost{border:1px solid var(--line);background:#fff;color:var(--ink)}
.btn.ghost:hover{border-color:var(--gold);color:var(--gold)}

/* 区块 */
section.blk{padding:56px 0;border-bottom:1px solid var(--line)}
section.blk:last-of-type{border-bottom:0}
.h2{font-family:var(--serif);font-size:clamp(21px,3vw,27px);letter-spacing:.04em;font-weight:700;margin-bottom:10px}
.sub{color:var(--ink2);font-size:14.5px;margin-bottom:30px;max-width:700px}

/* 服务卡 */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 22px}
.card .n{font-family:var(--serif);font-size:12px;letter-spacing:.3em;color:var(--gold);font-weight:700}
.card h3{font-family:var(--serif);font-size:18px;margin:10px 0 8px;letter-spacing:.03em}
.card p{font-size:14px;color:var(--ink2);line-height:1.8}
.card ul{margin-top:10px;padding-left:0;list-style:none}
.card li{font-size:13.5px;color:var(--ink2);padding-left:14px;position:relative;line-height:1.9}
.card li::before{content:"";position:absolute;left:0;top:11px;width:5px;height:5px;border-radius:50%;background:var(--gold)}

/* 流程 */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;counter-reset:s}
.step{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 16px;position:relative}
.step::before{counter-increment:s;content:counter(s,decimal-leading-zero);font-family:var(--serif);font-size:12px;letter-spacing:.16em;color:var(--gold);font-weight:700}
.step b{display:block;font-size:14.5px;margin:7px 0 5px}
.step span{font-size:12.5px;color:var(--ink3);line-height:1.75}

/* 案例图 */
.shots{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.shots figure{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.shots img{width:100%;height:190px;object-fit:cover;cursor:zoom-in}
.shots figcaption{font-size:12.5px;color:var(--ink2);padding:9px 12px;line-height:1.6}
.shots figure a{display:block;position:relative;cursor:pointer}
.shots figure a .go{position:absolute;right:8px;bottom:8px;font-size:11px;letter-spacing:.06em;color:#fff;background:rgba(18,28,46,.72);padding:4px 9px;border-radius:20px;opacity:0;transform:translateY(4px);transition:.28s}
.shots figure a:hover .go{opacity:1;transform:none}
.shots figure a img{cursor:pointer}
.shots figure a:hover img{transform:scale(1.03)}
.shots figure img{transition:transform .5s ease}

/* 优势 */
.adv{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.adv div{background:var(--card);border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:0 12px 12px 0;padding:18px 20px}
.adv b{display:block;font-family:var(--serif);font-size:15.5px;margin-bottom:6px}
.adv p{font-size:13.5px;color:var(--ink2);line-height:1.8}

/* FAQ */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 18px;margin-bottom:10px}
.faq summary{cursor:pointer;padding:15px 0;font-size:15px;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--gold);font-size:19px;font-weight:400;flex:none}
.faq details[open] summary::after{content:"−"}
.faq details p{font-size:14px;color:var(--ink2);padding:0 0 16px;line-height:1.85}

/* 联系 */
.contact{background:var(--blue-deep);color:#eaf1f8;border-radius:16px;padding:38px 34px;text-align:center}
.contact .kicker{color:#c9a86f}
.contact h2{font-family:var(--serif);font-size:clamp(21px,3.2vw,28px);margin-bottom:10px}
.contact p{color:#a9c1d8;font-size:14px}
.contact .tel-big{display:inline-flex;align-items:center;gap:10px;margin:22px 0 6px;font-family:var(--sans);font-size:clamp(22px,5vw,30px);font-weight:800;letter-spacing:.06em;color:#fff;border-bottom:1px solid rgba(201,168,111,.5);padding-bottom:8px}
.contact .tel-big svg{color:#c9a86f}
.contact .note{font-size:12.5px;color:#7f9ab4;margin-top:14px}

/* 页脚 */
footer{padding:34px 0;text-align:center;color:var(--ink3);font-size:12.5px;line-height:2}
footer a{color:var(--blue)}
footer .links{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:12px;font-size:13px}

/* 灯箱 */
#lb{position:fixed;inset:0;background:rgba(10,14,20,.94);z-index:99;display:none;align-items:center;justify-content:center;padding:20px;cursor:zoom-out}
#lb.on{display:flex}
#lb img{max-width:94vw;max-height:88vh;object-fit:contain;box-shadow:0 20px 80px rgba(0,0,0,.6)}

@media(max-width:900px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .shots{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .hero{padding:44px 0 36px}
  section.blk{padding:40px 0}
  .grid,.adv,.steps{grid-template-columns:1fr}
  .shots{grid-template-columns:repeat(2,1fr)}
  .shots img{height:120px}
  .top nav{display:none}
  .contact{padding:28px 20px}
  .sub{margin-bottom:22px}
}