/* ============================================================
   山海国旅官网 — 全站样式
   ============================================================ */
:root{
  --ink:#0d1220;
  --ink-2:#39435a;
  --muted:#6b7688;
  --line:#e5e9f0;
  --line-2:#d3dae6;
  --bg:#ffffff;
  --bg-soft:#f6f8fc;
  --bg-deep:#0a1a22;
  --brand:#0d5f7d;
  --brand-d:#0a4b63;
  --brand-l:#e7f2f7;
  --accent:#c2552f;
  --accent-l:#fbeee7;
  --radius:14px;
  --max:1120px;
  --shadow-sm:0 1px 2px rgba(13,18,32,.05),0 4px 14px rgba(13,18,32,.05);
  --shadow-lg:0 28px 64px -28px rgba(13,18,32,.22);
  --ff:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--ff);font-size:16px;line-height:1.72;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.26;letter-spacing:-.012em;font-weight:500}
h1{font-size:clamp(31px,4.3vw,50px);letter-spacing:-.025em}
h2{font-size:clamp(24px,3vw,34px)}
h3{font-size:18px}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- header ---------- */
.site-head{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.site-head .wrap{display:flex;align-items:center;gap:28px;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:500;letter-spacing:-.02em;flex:0 0 auto}
.logo-img{width:37px;height:24px;flex:0 0 auto;display:block}
.hero-slogan{
  margin:20px 0 0;font-size:15px;font-weight:500;letter-spacing:.18em;
  color:var(--brand);
}
.hero-slogan::before{content:"—— ";letter-spacing:0}
.hero-slogan::after{content:" ——";letter-spacing:0}
.logo small{font-size:12px;color:var(--muted);font-weight:400;margin-left:2px}
.nav{display:flex;gap:26px;margin-left:auto;font-size:14.5px;color:var(--ink-2)}
.nav a{padding:4px 0;border-bottom:2px solid transparent;transition:.16s}
.nav a:hover{color:var(--brand)}
.nav a.active{color:var(--ink);border-bottom-color:var(--brand)}
.nav-toggle{
  display:none;margin-left:auto;width:40px;height:40px;border:1px solid var(--line);
  background:#fff;border-radius:10px;cursor:pointer;padding:0;place-items:center;
}
.nav-toggle i,.nav-toggle i::before,.nav-toggle i::after{
  display:block;width:16px;height:1.5px;background:var(--ink);border-radius:2px;content:"";
}
.nav-toggle i{position:relative}
.nav-toggle i::before{position:absolute;top:-5px}
.nav-toggle i::after{position:absolute;top:5px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:10px;border:1px solid transparent;
  font-family:var(--ff);font-size:14.5px;font-weight:500;cursor:pointer;
  transition:.18s;white-space:nowrap;background:none;color:inherit;
}
.btn-p{background:var(--brand);color:#fff}
.btn-p:hover{background:var(--brand-d)}
.btn-s{background:#fff;border-color:var(--line-2);color:var(--ink)}
.btn-s:hover{border-color:#aab6c9;background:#fbfcfe}
.btn-sm{height:38px;padding:0 15px;font-size:14px}
.arrow::after{content:"→";font-size:15px;line-height:1}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:70px 0 62px}
.hero-bg{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(880px 400px at 84% -14%,#e8f3f8 0%,rgba(255,255,255,0) 72%),
    radial-gradient(600px 320px at 2% 12%,#fdf1ea 0%,rgba(255,255,255,0) 70%);
}
.hero-grid{position:relative;display:grid;grid-template-columns:1.03fr .97fr;gap:56px;align-items:center}
.pill{
  display:inline-flex;align-items:center;gap:8px;height:31px;padding:0 13px;border-radius:999px;
  background:var(--accent-l);color:#8f3c1d;font-size:13px;font-weight:500;
}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:block}
.hero h1{margin:20px 0 18px}
.hero h1 em{font-style:normal;color:var(--brand);position:relative;white-space:nowrap}
.hero-lead{font-size:16.5px;color:var(--ink-2);max-width:33em}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 22px}
.trust{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13.5px;color:var(--muted)}
.trust span{display:inline-flex;align-items:center;gap:7px}
.trust span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent);flex:0 0 auto}

/* ---------- mock AI answer ---------- */
.mock{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--shadow-lg);overflow:hidden;
}
.mock-top{display:flex;align-items:center;gap:9px;padding:11px 16px;background:var(--bg-soft);border-bottom:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.mock-dots{display:flex;gap:5px}
.mock-dots i{width:8px;height:8px;border-radius:50%;background:#d8dee9;display:block}
.mock-body{padding:18px 18px 20px}
.mock-q{
  display:flex;gap:10px;align-items:flex-start;background:var(--bg-soft);
  border:1px solid var(--line);border-radius:11px;padding:11px 14px;font-size:13.5px;color:var(--ink-2);
}
.mock-q b{color:var(--ink);font-weight:500}
.mock-a{margin-top:16px;font-size:13.5px;color:var(--ink-2);line-height:1.8}
.mock-a strong{color:var(--ink);font-weight:500}
.cite{
  display:inline-flex;align-items:center;justify-content:center;min-width:16px;height:16px;
  padding:0 4px;margin:0 2px;border-radius:5px;background:var(--brand-l);color:var(--brand-d);
  font-size:11px;font-weight:500;vertical-align:1.5px;
}
.mock-src{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);display:grid;gap:9px}
.mock-src a{display:flex;align-items:center;gap:9px;font-size:12.5px;color:var(--muted)}
.mock-src b{
  width:16px;height:16px;border-radius:4px;background:var(--brand-l);color:var(--brand-d);
  display:grid;place-items:center;font-size:10.5px;font-weight:500;flex:0 0 auto;
}
.mock-src a:first-child{color:var(--ink-2);font-weight:500}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats div{background:var(--bg);padding:26px 24px}
.stats b{display:block;font-size:28px;font-weight:500;letter-spacing:-.03em;color:var(--brand)}
.stats span{font-size:13.5px;color:var(--muted)}

/* ---------- sections ---------- */
.sec{padding:76px 0}
.sec-soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
/* 山海文旅 子品牌板块：双色渐变底，区别于纯白与浅灰 */
.sec-brand{
  background:
    radial-gradient(760px 340px at 88% -12%,#fdf1ea 0%,rgba(255,255,255,0) 70%),
    radial-gradient(620px 320px at 4% 112%,#e8f3f8 0%,rgba(255,255,255,0) 72%),
    #fff;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.sec-head{max-width:740px;margin-bottom:44px}
.eyebrow{font-size:12.5px;font-weight:500;color:var(--brand);letter-spacing:.1em;text-transform:uppercase}
.sec-head h2{margin:12px 0 14px}
.sec-head p{color:var(--muted);font-size:15.5px}
.sec-foot{margin-top:36px;display:flex;gap:12px;flex-wrap:wrap}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;transition:.2s;
}
.card:hover{border-color:var(--line-2);box-shadow:var(--shadow-sm)}
.card h3{margin-bottom:9px}
.card p{font-size:14.5px;color:var(--muted)}
.card ul{display:grid;gap:8px;margin-top:15px}
.card ul li{position:relative;padding-left:16px;font-size:14px;color:var(--ink-2)}
.card ul li::before{content:"";position:absolute;left:0;top:10px;width:5px;height:5px;border-radius:2px;background:var(--brand)}
.card ul li b{font-weight:500;color:var(--ink)}
.card .tag{display:inline-block;font-size:12px;font-weight:500;color:var(--accent);background:var(--accent-l);border-radius:6px;padding:2px 8px;margin-bottom:14px}
.icon{
  width:38px;height:38px;border-radius:11px;background:var(--brand-l);
  display:grid;place-items:center;margin-bottom:16px;
}
.icon span{width:15px;height:15px;border:2px solid var(--brand);border-radius:4px;display:block}
.icon.round span{border-radius:50%}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.step-n{
  width:34px;height:34px;border-radius:10px;background:var(--brand);color:#fff;
  display:grid;place-items:center;font-size:14px;font-weight:500;margin-bottom:16px;
}
.step h3{font-size:16px;margin-bottom:8px}
.step p{font-size:14px;color:var(--muted)}

/* table */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{border-collapse:collapse;width:100%;min-width:620px;font-size:14.5px}
th,td{text-align:left;padding:15px 20px;border-bottom:1px solid var(--line)}
th{background:var(--bg-soft);font-weight:500;font-size:13.5px;color:var(--ink-2);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
td.yes{color:var(--accent);font-weight:500}
td.no{color:#c0392b}

/* faq */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{
  cursor:pointer;font-size:16px;font-weight:500;list-style:none;
  display:flex;justify-content:space-between;align-items:flex-start;gap:20px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"＋";color:var(--brand);font-size:17px;line-height:1.4;flex:0 0 auto}
.faq details[open] summary::after{content:"－"}
.faq .ans{padding-top:12px;color:var(--ink-2);font-size:14.8px;max-width:66em}
.faq .ans b{font-weight:500;color:var(--ink)}

/* cta band */
.cta{background:var(--bg-deep);color:#fff;padding:64px 0}
.cta h2{color:#fff}
.cta p{color:#a6b0c4;margin:14px 0 26px;max-width:46em}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.cta .btn-s{background:transparent;border-color:#3a4459;color:#fff}
.cta .btn-s:hover{border-color:#66718a;background:rgba(255,255,255,.04)}

/* forms */
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.field{display:grid;gap:7px}
.field.full{grid-column:1/-1}
.field label{font-size:13.5px;font-weight:500;color:var(--ink-2)}
.field input,.field select,.field textarea{
  font-family:var(--ff);font-size:14.5px;color:var(--ink);background:#fff;
  border:1px solid var(--line-2);border-radius:10px;padding:11px 13px;width:100%;
}
.field textarea{min-height:112px;resize:vertical;line-height:1.6}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--brand);outline:none}
.hint{font-size:13px;color:var(--muted)}

/* 待补充标记（上线前请替换为真实信息） */
.tbd{
  display:inline-block;padding:1px 7px;border-radius:5px;
  background:var(--accent-l);color:#8f3c1d;font-size:12.5px;font-weight:500;
}

/* 联系人卡片 */
.person{display:flex;gap:14px;align-items:flex-start;padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.person .avatar{
  width:56px;height:56px;border-radius:50%;background:var(--brand-l);color:var(--brand-d);
  display:grid;place-items:center;font-size:17px;font-weight:500;flex:0 0 auto;overflow:hidden;
}
.person .avatar img{width:100%;height:100%;object-fit:cover;display:block}
.person b{display:block;font-size:15.5px;font-weight:500;margin-bottom:2px}
.person .role{font-size:13px;color:var(--muted);margin-bottom:7px}
.person a{display:inline-flex;align-items:center;gap:7px;font-size:15px;font-weight:500;color:var(--brand)}
.person a:hover{color:var(--brand-d)}
.person a + a{margin-left:16px}

/* content prose (about page) */
.prose{max-width:760px}
.prose h2{margin:44px 0 14px}
.prose h2:first-child{margin-top:0}
.prose p{margin-bottom:16px;color:var(--ink-2)}
.prose ul{margin:0 0 18px;display:grid;gap:9px}
.prose ul li{padding-left:18px;position:relative;color:var(--ink-2);font-size:15px}
.prose ul li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;border-radius:2px;background:var(--brand)}
.facts{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.facts dl{display:grid;grid-template-columns:180px 1fr;margin:0;font-size:14.5px}
.facts dt{padding:14px 20px;background:var(--bg-soft);font-weight:500;color:var(--ink-2);border-bottom:1px solid var(--line)}
.facts dd{padding:14px 20px;margin:0;border-bottom:1px solid var(--line);color:var(--ink-2)}
.facts dl > *:nth-last-child(-n+2){border-bottom:0}

/* footer */
.site-foot{background:var(--bg-deep);color:#98a3b8;font-size:13.5px;padding:52px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:34px;border-bottom:1px solid #1e2637}
.site-foot .logo{color:#fff;margin-bottom:14px}
.site-foot h4{color:#fff;font-size:13.5px;font-weight:500;margin-bottom:14px}
.site-foot li{margin-bottom:9px}
.site-foot a:hover{color:#fff}
.site-foot .addr{line-height:1.8}
.foot-slogan{margin:0 0 14px;font-size:13px;letter-spacing:.3em;color:#c9d3e0}
.foot-bottom{padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px;color:#6d7893}

/* 关于页 logo 展示 */
.about-logo{margin:0 0 30px;text-align:center}
.about-logo img{width:min(320px,70%);height:auto}
.about-logo figcaption{margin-top:10px;font-size:12.5px;color:var(--muted)}

/* ---------- 图片位（照片替换占位图后提示自动消失，无需改代码） ---------- */
.ph{
  position:relative;margin:0;overflow:hidden;border-radius:var(--radius);
  border:1px solid var(--line);background:var(--brand-l);
}
.ph>img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .6s cubic-bezier(.2,.7,.3,1);
}
a.ph:hover>img{transform:scale(1.04)}
.ph figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:34px 16px 12px;color:#fff;
  font-size:13px;font-weight:500;letter-spacing:.03em;pointer-events:none;
  background:linear-gradient(rgba(6,25,33,0),rgba(6,25,33,.74));
}

/* 通用图框比例（品牌页等复用） */
.g-wide{aspect-ratio:21/9}
.g-half{aspect-ratio:4/3}

/* 卡片配图（业务范围 / 行程方案） */
.card.has-media{padding-top:0;overflow:hidden}
.card.has-media .card-media{
  margin:0 0 20px;border:0;border-bottom:1px solid var(--line);border-radius:0;
}
.card-media{aspect-ratio:16/10}
.rt-media{aspect-ratio:16/9}

/* 关于页 / 联系页实景图 */
.band{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.band-media{aspect-ratio:3/2}
.band-note{font-size:13px;color:var(--muted);margin-top:10px}

/* ---------- 社媒关注入口（首页 hero） ---------- */
.follow-bar{display:flex;flex-wrap:wrap;gap:11px;margin-top:24px}
.follow-item{
  display:flex;align-items:center;gap:11px;
  padding:10px 16px 10px 11px;background:#fff;
  border:1px solid var(--line-2);border-radius:12px;
  box-shadow:var(--shadow-sm);transition:.18s;min-width:0;
}
.follow-item:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:0 10px 24px -12px rgba(13,95,125,.45)}
.follow-item.is-static{cursor:default}
.follow-item.is-static:hover{border-color:var(--line-2);transform:none;box-shadow:var(--shadow-sm)}
.follow-ico{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;flex:0 0 auto;color:#fff}
.follow-ico svg{width:18px;height:18px;fill:currentColor}
.follow-ico.xhs{background:#ff2442}
.follow-ico.sph{background:#ef8a2e}
.follow-ico.dy{background:#161722}
.follow-txt b{display:block;font-size:14px;font-weight:500;line-height:1.3;white-space:nowrap}
.follow-txt i{display:block;font-style:normal;font-size:12px;color:var(--muted);line-height:1.35;white-space:nowrap}
.follow-tip{margin-top:12px;font-size:13px;color:var(--muted);line-height:1.6}

/* 页内锚点跳转时避开粘性导航 */
section[id]{scroll-margin-top:78px}

/* 往期团队实图：横向滑动展示 */
.rail{position:relative}
.rail-track{
  display:flex;gap:14px;margin:0;padding:2px 2px 12px;
  overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x mandatory;scroll-behavior:smooth;
  -webkit-overflow-scrolling:touch;
}
.rail-track::-webkit-scrollbar{height:6px}
.rail-track::-webkit-scrollbar-track{background:transparent}
.rail-track::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px}
.rail-track::-webkit-scrollbar-thumb:hover{background:var(--brand)}
.rail-track:focus-visible{outline:2px solid var(--brand);outline-offset:4px;border-radius:8px}
.rail-item{flex:0 0 clamp(228px,26vw,300px);margin:0;scroll-snap-align:start}
.rail-cap{aspect-ratio:4/3}
.rail-item .ph{border-radius:12px}
.rail-item figcaption{font-size:12.5px;padding:30px 13px 11px}
.rail-nav{
  position:absolute;top:calc(50% - 27px);width:40px;height:40px;padding:0;border-radius:50%;
  background:#fff;border:1px solid var(--line-2);box-shadow:var(--shadow-sm);
  display:grid;place-items:center;cursor:pointer;z-index:2;color:var(--ink-2);transition:.18s;
}
.rail-nav svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.rail-nav:hover{background:var(--brand);border-color:var(--brand);color:#fff}
.rail-nav[disabled]{opacity:.3;cursor:default;pointer-events:none}
.rail-nav.prev{left:-18px}
.rail-nav.next{right:-18px}
.rail-hint{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:13px;color:var(--muted)}
.rail-hint svg{width:15px;height:15px;flex:0 0 auto;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .nav{
    position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;gap:0;padding:8px 24px 16px;display:none;
  }
  .nav.open{display:flex}
  .nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav a.active{border-bottom-color:var(--line)}
  .nav-toggle{display:grid}
  .head-cta{display:none}
  .hero{padding:48px 0 44px}
  .hero-grid,.grid-3,.grid-2,.steps,.form-grid,.foot-grid,.band{grid-template-columns:1fr}
  .follow-txt b,.follow-txt i{white-space:normal}
  .follow-bar{gap:9px}
  .rail-nav{display:none}
  .d-only{display:none}
  .rail-track{margin:0 -24px;padding-left:24px;padding-right:24px;scroll-padding-left:24px}
  .rail-item{flex:0 0 74%}
  .g-wide{aspect-ratio:16/9}
  .hero-grid{gap:40px}
  .steps{gap:26px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .sec{padding:56px 0}
  .sec-head{margin-bottom:32px}
  .facts dl{grid-template-columns:1fr}
  .facts dt{border-bottom:0;padding-bottom:4px}
  .foot-grid{gap:28px}
}
@media (max-width:520px){
  .wrap{padding:0 18px}
  .hero h1{font-size:29px}
  .stats b{font-size:24px}
  .rail-track{margin:0 -18px;padding-left:18px;padding-right:18px;scroll-padding-left:18px}
  .rail-item{flex:0 0 82%}
  .rail-hint{font-size:12.5px}
}