/* ============================================================
   承德辰钛矿产品贸易有限公司 — 单页官网
   设计语言：矿石黑蓝 × 钛白 × 熔渣琥珀 · 规格铭牌式排版
   ============================================================ */

:root{
  --ink:      #0C1218;   /* 矿石黑（深色底） */
  --panel:    #131D27;   /* 深色面板 */
  --panel-2:  #18242F;
  --line-d:   #2A3846;   /* 深色发丝线 */
  --paper:    #F2F5F7;   /* 钛白（浅色底） */
  --card:     #FFFFFF;
  --line-l:   #DCE3E9;   /* 浅色发丝线 */
  --text-l:   #16222D;   /* 浅底正文 */
  --muted-l:  #5A6B7A;   /* 浅底弱化 */
  --text-d:   #E7EDF2;   /* 深底正文 */
  --muted-d:  #92A5B6;   /* 深底弱化 */
  --ember:    #E8842C;   /* 熔渣琥珀（强调色） */
  --ember-dk: #C96A1B;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-mono:"Cascadia Mono","JetBrains Mono",Consolas,"SF Mono",Menlo,monospace;
  --wrap:1180px;
  --header-h:72px;
}

/* ---------- 基础 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  background:var(--ink);
  color:var(--text-d);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
h1,h2,h3,h4{font-weight:800;line-height:1.3;letter-spacing:.01em}
.mono{font-family:var(--font-mono)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
:focus-visible{outline:2px solid var(--ember);outline-offset:3px}

/* ---------- 双语切换 ---------- */
body.lang-zh .en{display:none!important}
body.lang-en .zh{display:none!important}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:50;
  height:var(--header-h);
  background:rgba(12,18,24,.82);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-d);
}
.header-inner{height:var(--header-h);display:flex;align-items:center;gap:32px}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.brand-mark{width:38px;height:38px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-cn{font-size:19px;font-weight:800;letter-spacing:.14em;color:#fff}
.brand-en-zh{font-size:10px;letter-spacing:.3em;color:var(--muted-d)}
.main-nav{display:flex;gap:30px}
.main-nav a{
  font-size:15px;color:var(--muted-d);padding:6px 0;
  border-bottom:2px solid transparent;transition:color .2s,border-color .2s;
}
.main-nav a:hover{color:#fff;border-color:var(--ember)}
.header-actions{display:flex;align-items:center;gap:16px}
.lang-btn{
  background:none;border:1px solid var(--line-d);color:var(--text-d);
  font-size:12px;letter-spacing:.12em;padding:7px 12px;border-radius:2px;cursor:pointer;
  transition:border-color .2s,color .2s;
}
.lang-btn:hover{border-color:var(--ember);color:var(--ember)}
.phone-cta{
  font-size:13px;letter-spacing:.06em;color:var(--ember);
  border:1px solid rgba(232,132,44,.45);padding:8px 14px;border-radius:2px;
  transition:background .2s;
}
.phone-cta:hover{background:rgba(232,132,44,.12)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;margin:5px 0;transition:transform .25s,opacity .25s}

/* ---------- 首屏 ---------- */
.hero{
  padding:calc(var(--header-h) + 72px) 0 0;
  background:
    linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px),
    radial-gradient(1100px 520px at 78% -10%,rgba(232,132,44,.10),transparent 60%),
    var(--ink);
  background-size:56px 56px,56px 56px,auto,auto;
}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
.eyebrow{
  font-size:12px;letter-spacing:.18em;color:var(--ember);
  border-left:2px solid var(--ember);padding-left:14px;margin-bottom:26px;
  text-transform:uppercase;
}
.hero-title{font-size:clamp(34px,4.6vw,56px);letter-spacing:.02em;color:#fff}
.hero-title i{font-style:normal;color:var(--ember);font-weight:400}
.hero-sub{margin-top:26px;max-width:56ch;color:var(--muted-d);font-size:16.5px}
.hero-sub strong{color:var(--text-d)}
.hero-cta{margin-top:38px;display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:14px 30px;font-size:15px;font-weight:700;
  border-radius:2px;letter-spacing:.06em;transition:transform .15s,background .2s,border-color .2s;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--ember);color:#181009}
.btn-primary:hover{background:var(--ember-dk)}
.btn-ghost{border:1px solid var(--line-d);color:var(--text-d)}
.btn-ghost:hover{border-color:var(--ember);color:var(--ember)}

/* 首屏实拍图墙 */
.hero-photos{
  display:grid;grid-template-columns:1fr 1fr;gap:10px;
  border:1px solid var(--line-d);padding:10px;background:rgba(255,255,255,.02);
}
.hero-photos figure{position:relative;overflow:hidden;aspect-ratio:4/3}
.hero-photos img{width:100%;height:100%;object-fit:cover;filter:saturate(.92);transition:transform .5s}
.hero-photos figure:hover img{transform:scale(1.05)}
.hero-photos figcaption{
  position:absolute;left:0;bottom:0;
  font-size:10.5px;letter-spacing:.14em;color:#DFE8EF;
  background:linear-gradient(transparent,rgba(8,12,16,.86));
  padding:22px 10px 8px;width:100%;
}

/* 产能数据流 */
.flow-strip{
  margin-top:72px;border-top:1px solid var(--line-d);
  display:flex;align-items:center;gap:28px;padding:30px 4px 34px;flex-wrap:wrap;
}
.flow-item{display:flex;align-items:baseline;gap:14px}
.flow-num{font-size:44px;font-weight:700;color:#fff;line-height:1}
.flow-num em{font-style:normal;font-size:14px;color:var(--ember);margin-left:6px;letter-spacing:.1em}
.flow-label{font-size:13px;color:var(--muted-d);max-width:24ch}
.flow-arrow{color:var(--ember);font-size:24px;opacity:.85}

/* ---------- 通用区块 ---------- */
.section{padding:104px 0}
.section-light{background:var(--paper);color:var(--text-l)}
.section-paper{background:#fff;color:var(--text-l)}
.section-dark{background:var(--ink);color:var(--text-d)}
.section [id]{scroll-margin-top:var(--header-h)}
section[id]{scroll-margin-top:calc(var(--header-h) + 8px)}

.section-head{
  display:flex;gap:22px;align-items:flex-start;
  border-bottom:1px solid var(--line-l);padding-bottom:26px;margin-bottom:56px;
}
.section-dark .section-head{border-color:var(--line-d)}
.section-no{
  font-size:15px;color:var(--ember);border:1px solid currentColor;
  padding:4px 10px;border-radius:2px;line-height:1;margin-top:8px;
}
.section-head h2{font-size:clamp(26px,3vw,36px)}
.section-sub{font-size:12px;letter-spacing:.22em;color:var(--muted-l);margin-top:8px}
.section-dark .section-sub{color:var(--muted-d)}

/* ---------- 公司简介 ---------- */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:start}
.about-text p{margin-bottom:22px;color:#31414F;font-size:16.5px;text-align:justify}
.about-motto{
  border-left:3px solid var(--ember);background:#fff;
  padding:18px 22px;color:var(--text-l)!important;
}
.timeline{background:var(--card);border:1px solid var(--line-l);padding:30px 30px 22px}
.timeline h3{font-size:12px;letter-spacing:.24em;color:var(--ember);margin-bottom:18px}
.timeline ol li{
  display:flex;gap:16px;padding:10px 0;border-bottom:1px dashed var(--line-l);
  font-size:14.5px;color:#31414F;align-items:baseline;
}
.timeline ol li:last-child{border-bottom:0}
.tl-year{color:var(--text-l);font-weight:700;font-size:14px;flex:none;width:46px}
.about-photo{margin-top:20px;border:1px solid var(--line-l)}
.about-photo img{width:100%;height:190px;object-fit:cover}
.about-photo figcaption{font-size:11px;letter-spacing:.12em;color:var(--muted-l);padding:10px 14px}

/* ---------- 生产基地 ---------- */
.base-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.base-card{
  background:var(--card);border:1px solid var(--line-l);
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.base-card:hover{transform:translateY(-5px);box-shadow:0 18px 40px rgba(12,20,28,.10);border-color:#C9D4DD}
.base-card figure{overflow:hidden;aspect-ratio:16/8.6}
.base-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.base-card:hover img{transform:scale(1.04)}
.base-info{padding:24px 26px 26px}
.base-info h3{font-size:20px}
.base-meta{font-size:11.5px;letter-spacing:.08em;color:var(--muted-l);margin-top:8px}
.base-cap{margin-top:14px;font-size:14.5px;color:#31414F;border-top:1px dashed var(--line-l);padding-top:14px}
.base-cap strong{color:var(--ember-dk);font-size:20px;font-family:var(--font-mono);margin:0 2px}

/* ---------- 主营产品 ---------- */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.product-card{
  background:var(--panel);border:1px solid var(--line-d);border-top:2px solid var(--ember);
  padding:30px 26px;display:flex;flex-direction:column;gap:14px;
  transition:transform .25s,border-color .25s,background .25s;
}
.product-card:hover{transform:translateY(-5px);border-color:var(--ember);background:var(--panel-2)}
.p-icon{width:44px;height:44px;color:var(--ember)}
.product-card h3{font-size:19px;color:#fff}
.p-num{font-size:12px;letter-spacing:.1em;color:var(--ember)}
.product-card p:not(.p-num){font-size:14px;color:var(--muted-d);line-height:1.85}
.product-note{margin-top:34px;font-size:12px;letter-spacing:.1em;color:var(--muted-d)}

/* ---------- 荣誉资质 ---------- */
.honors-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:stretch}
.plaque{
  border:1px solid var(--line-l);background:var(--card);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:52px 40px;position:relative;
}
.plaque::before{
  content:"";position:absolute;inset:10px;border:1px solid var(--line-l);pointer-events:none;
}
.plaque-seal{width:58px;height:58px;color:var(--ember);margin-bottom:22px}
.plaque-kicker{font-size:11px;letter-spacing:.26em;color:var(--muted-l);margin-bottom:14px}
.plaque h3{font-size:24px;color:var(--text-l)}
.honor-list{display:flex;flex-direction:column;justify-content:space-between;gap:26px}
.honor-list li{
  display:flex;gap:24px;align-items:flex-start;
  border:1px solid var(--line-l);background:var(--card);padding:26px 30px;
}
.hl-num{font-size:38px;font-weight:700;color:var(--ember-dk);line-height:1;flex:none;min-width:86px}
.hl-num i{font-style:normal;font-size:15px;margin-left:4px}
.honor-list h4{font-size:17px;margin-bottom:6px}
.honor-list p{font-size:14px;color:var(--muted-l)}

/* ---------- 联系我们 ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-card{
  background:var(--panel);border:1px solid var(--line-d);padding:34px 30px;
  display:flex;flex-direction:column;gap:16px;transition:border-color .25s,transform .25s;
}
a.contact-card:hover{border-color:var(--ember);transform:translateY(-4px)}
.cc-role{font-size:11.5px;letter-spacing:.2em;color:var(--muted-d)}
.cc-tel{font-size:clamp(22px,2.2vw,30px);font-weight:700;color:#fff;letter-spacing:.04em}
a.contact-card .cc-tel{color:var(--ember)}
.cc-hint{font-size:12.5px;color:var(--muted-d);letter-spacing:.08em}

/* ---------- 页脚 ---------- */
.site-footer{background:#0A0F14;border-top:1px solid var(--line-d);padding:30px 0}
.footer-inner{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;align-items:baseline}
.f-name{font-size:14.5px;color:var(--muted-d)}
.f-meta{font-size:11.5px;letter-spacing:.14em;color:#5F7284}

/* ---------- 进场动效（仅在 JS 可用时启用，避免无 JS 时内容不可见） ---------- */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .hero-photos img,.base-card img{transition:none}
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-sub{max-width:none}
  .about-grid{grid-template-columns:1fr;gap:44px}
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .honors-grid{grid-template-columns:1fr;gap:30px}
  .contact-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  :root{--header-h:62px}
  .wrap{padding:0 20px}
  .section{padding:72px 0}
  .main-nav{
    position:fixed;top:var(--header-h);left:0;right:0;
    flex-direction:column;gap:0;
    background:#0C1218;
    border-bottom:1px solid var(--line-d);
    box-shadow:0 18px 34px rgba(0,0,0,.45);
    padding:8px 24px 18px;
    display:none;
  }
  .main-nav.open{display:flex}
  .main-nav a{padding:14px 0;border-bottom:1px solid var(--line-d);font-size:16px}
  .main-nav a:last-child{border-bottom:0}
  .nav-toggle{display:block}
  .phone-cta{display:none}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .hero{padding-top:calc(var(--header-h) + 44px)}
  .flow-strip{margin-top:52px;gap:16px;padding-bottom:26px}
  .flow-num{font-size:32px}
  .flow-arrow{display:none}
  .flow-item{flex-direction:column;gap:2px;min-width:44%}
  .base-grid{grid-template-columns:1fr}
  .product-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-inner{flex-direction:column;gap:6px}
}
@media (max-width:420px){
  .hero-title{font-size:30px}
  .brand-cn{font-size:17px}
}