/* TIANZI GROUP — International Site (tianzioem.com)
   Static, no-build-required CSS. Mobile-first. */

:root{
  /* Brand palette — from official TIANZI GROUP logo (#00AEBB teal) */
  --navy:#06333d;
  --navy-2:#0a4a57;
  --ink:#122b32;
  --body:#43555c;
  --line:#dfe9ec;
  --bg:#ffffff;
  --bg-soft:#f4f9fa;
  --gold:#00aebb;
  --gold-soft:#dff5f7;
  --teal:#00aebb;
  --radius:12px;
  --max:1200px;
  --shadow:0 6px 24px rgba(6,51,61,.09);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Inter","Helvetica Neue",Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--body);
  background:var(--bg);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy-2);text-decoration:none}
a:hover{color:var(--gold)}
h1,h2,h3,h4{color:var(--ink);line-height:1.25;margin:0 0 .5em;font-weight:700}
h1{font-size:2.1rem}
h2{font-size:1.75rem}
h3{font-size:1.15rem}
p{margin:0 0 1em}
ul{margin:0 0 1em;padding-left:1.15em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
section{padding:56px 0}
.section-soft{background:var(--bg-soft)}
.eyebrow{
  display:inline-block;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--gold);font-weight:700;margin-bottom:10px;
}
.section-head{max-width:820px;margin:0 auto 36px;text-align:center}
.section-head p{color:var(--body);margin:0}
.center{text-align:center}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;padding:13px 26px;border-radius:8px;font-weight:600;font-size:.95rem;
  transition:.2s;border:1.5px solid transparent;cursor:pointer;
}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{background:#00909c;color:#fff}
.btn-outline{border-color:rgba(255,255,255,.55);color:#fff}
.btn-outline:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-2);color:#fff}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}

/* ---------- Top bar ---------- */
.topbar{background:var(--navy);color:#cfdae6;font-size:.83rem;padding:7px 0}
.topbar .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.topbar a{color:#cfdae6}
.topbar a:hover{color:#fff}

/* ---------- Header ---------- */
header.site{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--navy);font-size:1.15rem;letter-spacing:.02em}
.logo span{display:block}
.logo small{display:block;font-size:.62rem;letter-spacing:.22em;color:var(--gold);font-weight:700}
.logo-img{height:40px;width:auto;flex:0 0 auto}
nav.main{display:flex;align-items:center;gap:22px}
nav.main a{font-size:.92rem;font-weight:500;color:var(--ink);white-space:nowrap}
nav.main a:hover{color:var(--gold)}
.lang{display:flex;align-items:center;gap:6px;border-left:1px solid var(--line);padding-left:16px}
.lang select{
  border:1px solid var(--line);border-radius:6px;padding:6px 8px;font-size:.85rem;background:#fff;color:var(--ink);cursor:pointer;
}
.nav-toggle{display:none;background:none;border:0;font-size:1.5rem;cursor:pointer;color:var(--navy)}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(120deg,#06333d 0%,#08505f 55%,#0a6c7a 100%);
  color:#e8eef5;padding:78px 0 66px;position:relative;overflow:hidden;
}
.hero:after{
  content:"";position:absolute;right:-140px;top:-120px;width:460px;height:460px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,174,187,.30),transparent 62%);
}
.hero .wrap{position:relative;z-index:1}
.hero h1{color:#fff;font-size:2.5rem;max-width:820px}
.hero .lede{font-size:1.06rem;color:#c8d6e4;max-width:760px}
.hero .btn-outline{border-color:rgba(255,255,255,.5)}
.badges{display:flex;flex-wrap:wrap;gap:9px;margin-top:26px}
.badge{
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);
  padding:6px 13px;border-radius:999px;font-size:.8rem;color:#dbe6f1;
}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:44px}
.stat{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:20px}
.stat b{display:block;color:#fff;font-size:1.85rem;line-height:1.1}
.stat span{font-size:.84rem;color:#b6c7d8}

/* ---------- Cards / grids ---------- */
.grid{display:grid;gap:22px}
.g4{grid-template-columns:repeat(4,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;
  transition:.2s;
}
.card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.card h3{margin-bottom:.4em}
.card p{font-size:.93rem;margin-bottom:0}
.card .num{color:var(--gold);font-weight:800;font-size:.8rem;letter-spacing:.1em;display:block;margin-bottom:8px}

/* ---------- Spec block (CALLA-style 属性:值) ---------- */
.spec{list-style:none;padding:0;margin:14px 0 0;border-top:1px dashed var(--line)}
.spec li{
  display:flex;gap:10px;padding:7px 0;border-bottom:1px dashed var(--line);font-size:.88rem;
}
.spec li .k{flex:0 0 118px;color:var(--ink);font-weight:700}
.spec li .v{flex:1;color:var(--body)}
.prod-grid{grid-template-columns:repeat(2,1fr)}

/* ---------- Process ---------- */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;position:relative}
.step:before{
  counter-increment:s;content:counter(s,decimal-leading-zero);
  color:var(--gold);font-weight:800;font-size:.85rem;letter-spacing:.08em;
}
.step h4{margin:.2em 0 .2em;font-size:1rem;color:var(--ink)}
.step p{font-size:.86rem;margin:0}

/* ---------- Service blocks ---------- */
.svc{border-left:3px solid var(--gold);background:#fff;padding:22px;border-radius:0 var(--radius) var(--radius) 0;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.svc h3{color:var(--navy)}
.svc .tag{font-size:.75rem;font-weight:800;letter-spacing:.14em;color:var(--gold);text-transform:uppercase}

/* ---------- FAQ ---------- */
.faq{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.faq details{border-bottom:1px solid var(--line)}
.faq details:last-child{border-bottom:0}
.faq summary{
  cursor:pointer;padding:16px 20px;font-weight:600;color:var(--ink);font-size:.98rem;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-weight:800;font-size:1.2rem}
.faq details[open] summary:after{content:"–"}
.faq .a{padding:0 20px 18px;font-size:.92rem;color:var(--body)}

/* ---------- Contact / form ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}
form.q{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
form.q label{display:block;font-size:.85rem;font-weight:600;color:var(--ink);margin:0 0 6px}
form.q input,form.q select,form.q textarea{
  width:100%;border:1px solid var(--line);border-radius:8px;padding:11px 12px;font-size:.92rem;
  font-family:inherit;margin-bottom:14px;background:#fff;color:var(--ink);
}
form.q input:focus,form.q select:focus,form.q textarea:focus{outline:2px solid var(--gold-soft);border-color:var(--gold)}
form.q textarea{min-height:96px;resize:vertical}
.contact-info li{list-style:none;padding:10px 0;border-bottom:1px solid var(--line);font-size:.93rem}
.contact-info li b{color:var(--ink);display:inline-block;min-width:96px}
.contact-info ul{padding:0;margin:0}

/* ---------- Footer ---------- */
footer{background:var(--navy);color:#b8c8d8;padding:52px 0 26px;font-size:.9rem}
footer h4{color:#fff;font-size:1rem;margin-bottom:14px}
.f-logo{height:64px;width:auto;margin-bottom:12px}
footer a{color:#b8c8d8}
footer a:hover{color:#fff}
.f-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:28px}
.f-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:20px;font-size:.82rem;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.f-langs{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.f-langs a{background:rgba(255,255,255,.08);padding:4px 10px;border-radius:6px;font-size:.8rem}

/* ---------- Sticky mobile CTA ---------- */
.mcta{display:none}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .g4,.steps{grid-template-columns:repeat(2,1fr)}
  .f-grid{grid-template-columns:1fr 1fr}
  nav.main{
    display:none;position:absolute;top:100%;left:0;right:0;background:#fff;
    flex-direction:column;align-items:flex-start;padding:14px 20px 20px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow);
  }
  nav.main.open{display:flex}
  nav.main a{padding:9px 0;font-size:1rem}
  .lang{border-left:0;padding-left:0;margin-top:8px}
  .nav-toggle{display:block}
  header.site{position:relative}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:660px){
  h1{font-size:1.7rem}
  .hero h1{font-size:1.75rem}
  .hero{padding:52px 0 46px}
  section{padding:42px 0}
  .g4,.g3,.g2,.steps,.prod-grid,.f-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr;gap:12px}
  .stat b{font-size:1.5rem}
  .spec li{flex-direction:column;gap:2px}
  .spec li .k{flex:none}
  .logo-img{height:34px}
  .mcta{
    display:flex;position:fixed;bottom:0;left:0;right:0;z-index:60;background:#fff;
    border-top:1px solid var(--line);box-shadow:0 -4px 16px rgba(14,42,68,.1);
  }
  .mcta a{
    flex:1;text-align:center;padding:13px 8px;font-weight:700;font-size:.9rem;color:var(--ink);
  }
  .mcta a:first-child{border-right:1px solid var(--line)}
  .mcta a.cta{background:var(--gold);color:#fff}
  body{padding-bottom:56px}
}

/* ---------- RTL (Arabic) ---------- */
html[dir="rtl"] body{text-align:right}
html[dir="rtl"] .spec li .k{text-align:right}
html[dir="rtl"] .f-bottom{flex-direction:row-reverse}
html[dir="rtl"] nav.main{flex-direction:column;align-items:flex-end}