/* ============================================================
   豫工特种作业考证咨询网 · 全站基础样式 base.css
   风格：配饰复古 / 古铜 + 墨黑 + 暗红 · 对角线渐变 · 科技感
   说明：本文件为全站共享层（变量/导航/页脚/按钮/动画/响应式）
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --ink:#16120e;            /* 墨黑主底 */
  --ink-2:#1e1812;          /* 墨黑次底 */
  --ink-3:#241c14;          /* 深褐黑 */
  --ink-4:#0f0c09;          /* 最深 */
  --bronze:#b08d57;         /* 古铜 */
  --bronze-l:#d9bc85;       /* 亮铜 */
  --bronze-d:#8a6c3f;       /* 暗铜 */
  --red:#8a2f2f;            /* 暗红 */
  --red-d:#6e2323;
  --paper:#e9dfcd;          /* 主文字 */
  --paper-2:#b9ad95;        /* 次要文字 */
  --paper-3:#8d8371;        /* 弱文字 */
  --line:rgba(176,141,87,.22);
  --line-2:rgba(233,223,205,.1);
  --ok:#7d9a5f;
  --grad-bronze:linear-gradient(135deg,#c9a86b 0%,#8a6c3f 55%,#4a3824 100%);
  --grad-red:linear-gradient(135deg,#a03a33 0%,#6e2323 100%);
  --shadow:0 18px 44px rgba(0,0,0,.45);
  --radius:14px;
  --font-h:'Songti SC','STSong','Noto Serif SC',serif;
  --font-b:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --ease:cubic-bezier(.22,.9,.32,1);
}

/* ---------- 基础重置 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-b);
  background:var(--ink);
  color:var(--paper);
  line-height:1.75;
  font-size:15px;
  overflow-x:hidden;
  /* 墨黑底 + 细腻噪点纹理（CSS实现，非图片） */
  background-image:
    radial-gradient(1100px 500px at 85% -10%,rgba(138,47,47,.16),transparent 62%),
    radial-gradient(900px 620px at -12% 18%,rgba(176,141,87,.13),transparent 60%),
    repeating-linear-gradient(0deg,rgba(255,255,255,.012) 0 1px,transparent 1px 4px),
    linear-gradient(180deg,#171310 0%,#120e0a 100%);
  background-attachment:fixed;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .3s var(--ease)}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
::selection{background:var(--red);color:#fff}

/* 细滚动条 */
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-track{background:#0f0c09}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#8a6c3f,#5a4527);border-radius:9px}
::-webkit-scrollbar-thumb:hover{background:var(--bronze)}

/* ---------- 布局容器 ---------- */
.container{width:min(1180px,92%);margin:0 auto}
.container-lg{width:min(1320px,94%);margin:0 auto}
.grid{display:grid;gap:22px}

/* ---------- 排版 ---------- */
h1,h2,h3,h4{font-family:var(--font-h);font-weight:700;line-height:1.3;color:#f2e8d4}
h1{font-size:clamp(30px,5vw,54px)}
h2{font-size:clamp(24px,3.4vw,36px)}
h3{font-size:clamp(19px,2.4vw,24px)}
h4{font-size:17px}
p{margin-bottom:14px}
em{font-style:normal;color:var(--bronze-l)}
strong{color:#f2e8d4}

/* ---------- 章节骨架 ---------- */
.section{padding:84px 0;position:relative}
.section--dim{background:rgba(255,255,255,.022)}
.section--line{border-top:1px solid var(--line-2)}
.sec-head{max-width:760px;margin:0 auto 46px;text-align:center;position:relative;z-index:2}
.sec-head--left{max-width:640px;margin:0 0 40px;text-align:left}
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.42em;text-transform:uppercase;
  color:var(--bronze);margin-bottom:14px;
}
.kicker::before,.kicker::after{content:"";width:26px;height:1px;background:linear-gradient(90deg,transparent,var(--bronze))}
.kicker--plain::before,.kicker--plain::after{display:none}
.sec-sub{color:var(--paper-2);font-size:15px;margin-top:12px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;border-radius:999px;font-size:15px;font-weight:600;
  cursor:pointer;border:1px solid transparent;position:relative;overflow:hidden;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),background .35s,color .35s;
  white-space:nowrap;
}
.btn::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 30%,rgba(255,255,255,.22) 50%,transparent 70%);transform:translateX(-120%);transition:transform .8s var(--ease)}
.btn:hover::after{transform:translateX(120%)}
.btn:hover{transform:translateY(-3px)}
.btn-bronze{background:var(--grad-bronze);color:#221a10;box-shadow:0 10px 28px rgba(176,141,87,.28)}
.btn-bronze:hover{box-shadow:0 16px 36px rgba(176,141,87,.42)}
.btn-red{background:var(--grad-red);color:#f6e9d8;box-shadow:0 10px 28px rgba(138,47,47,.32)}
.btn-red:hover{box-shadow:0 16px 38px rgba(138,47,47,.45)}
.btn-ghost{border-color:var(--bronze);color:var(--bronze-l);background:rgba(176,141,87,.06)}
.btn-ghost:hover{background:rgba(176,141,87,.16);color:#f2e8d4}
.btn-line{background:transparent;border-color:rgba(233,223,205,.28);color:var(--paper)}
.btn-line:hover{border-color:var(--bronze-l);color:var(--bronze-l)}
.btn-lg{padding:16px 38px;font-size:16px}
.btn-sm{padding:8px 18px;font-size:13px}
.btn .ico{width:18px;height:18px}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:900;
  padding:20px 0;transition:padding .4s var(--ease),background .4s var(--ease),box-shadow .4s;
  background:linear-gradient(180deg,rgba(15,12,9,.88),rgba(15,12,9,.55) 70%,transparent);
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  padding:10px 0;background:rgba(15,12,9,.96);
  border-bottom-color:var(--line-2);box-shadow:0 12px 34px rgba(0,0,0,.5);
  backdrop-filter:blur(14px);
}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand .logo{
  width:46px;height:46px;border-radius:12px;object-fit:cover;
  box-shadow:0 0 0 1px rgba(176,141,87,.4),0 6px 16px rgba(0,0,0,.5);
}
.brand-txt{line-height:1.15}
.brand-txt b{display:block;font-family:var(--font-h);font-size:19px;letter-spacing:.14em;color:#f0e4cd}
.brand-txt span{font-size:11px;letter-spacing:.3em;color:var(--bronze)}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list>li{position:relative}
.nav-list>li>a{
  display:flex;align-items:center;gap:5px;padding:10px 13px;
  font-size:14px;color:var(--paper-2);border-radius:8px;transition:color .3s,background .3s;
}
.nav-list>li>a:hover,.nav-list>li.active>a{color:#f2e8d4;background:rgba(176,141,87,.1)}
.nav-list>li>a .arrow{width:10px;height:10px;transition:transform .3s}
.nav-list>li:hover>a .arrow{transform:rotate(180deg)}
.drop{
  position:absolute;top:calc(100% + 14px);left:0;min-width:196px;
  background:rgba(24,19,13,.97);border:1px solid var(--line);
  border-radius:12px;padding:10px;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;
}
.nav-list>li:hover .drop{opacity:1;visibility:visible;transform:translateY(0)}
.drop a{
  display:flex;align-items:center;gap:8px;padding:9px 14px;border-radius:8px;
  font-size:13.5px;color:var(--paper-2);transition:color .25s,background .25s,padding-left .25s;
}
.drop a:hover{color:#f2e8d4;background:rgba(176,141,87,.12);padding-left:20px}
.drop a::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--bronze);flex-shrink:0}
.nav-cta{flex-shrink:0}
.nav-burger{display:none;flex-direction:column;gap:5px;width:40px;height:40px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;background:rgba(176,141,87,.06);cursor:pointer}
.nav-burger span{display:block;width:20px;height:2px;background:var(--bronze-l);transition:.35s var(--ease)}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.site-footer{background:linear-gradient(180deg,#14100c,#0c0906);border-top:1px solid var(--line-2);position:relative;overflow:hidden}
.site-footer::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(700px 300px at 20% 0%,rgba(138,47,47,.14),transparent 65%),
             radial-gradient(700px 300px at 85% 100%,rgba(176,141,87,.1),transparent 65%);
  pointer-events:none;
}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:38px;padding:64px 0 46px;position:relative}
.foot-brand .logo{width:52px;height:52px;border-radius:13px;object-fit:cover;margin-bottom:16px;box-shadow:0 0 0 1px rgba(176,141,87,.4)}
.foot-brand p{color:var(--paper-2);font-size:13.5px;max-width:300px}
.foot-col h4{font-size:15px;letter-spacing:.18em;margin-bottom:18px;color:#f0e4cd;position:relative;padding-bottom:10px}
.foot-col h4::after{content:"";position:absolute;left:0;bottom:0;width:34px;height:2px;background:var(--grad-bronze);border-radius:2px}
.foot-col li{margin-bottom:9px}
.foot-col a{font-size:13.5px;color:var(--paper-2);transition:color .25s,padding-left .25s}
.foot-col a:hover{color:var(--bronze-l);padding-left:6px}
.foot-contact li{display:flex;gap:10px;font-size:13.5px;color:var(--paper-2);margin-bottom:12px}
.foot-contact .ico{width:16px;height:16px;flex-shrink:0;margin-top:3px;color:var(--bronze)}
.foot-bottom{border-top:1px solid var(--line-2);padding:20px 0;display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--paper-3);position:relative}
.foot-bottom a{color:var(--paper-3)}
.foot-bottom a:hover{color:var(--bronze-l)}
.foot-icp{color:var(--paper-2);font-weight:600}

/* ---------- 面包屑 ---------- */
.breadcrumb{font-size:13px;color:var(--paper-3);display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:30px}
.breadcrumb a{color:var(--bronze)}
.breadcrumb a:hover{color:var(--bronze-l)}
.breadcrumb .sep{color:var(--paper-3);opacity:.6}

/* ---------- 内页首屏 ---------- */
.page-hero{position:relative;padding:150px 0 86px;overflow:hidden}
.page-hero .bg{position:absolute;inset:0;object-fit:cover;width:100%;height:100%;opacity:.5}
.page-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(115deg,rgba(12,9,6,.96) 18%,rgba(20,15,10,.72) 48%,rgba(138,47,47,.18) 82%,rgba(12,9,6,.9));}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,9,6,.55),transparent 40%,transparent 70%,var(--ink));}
.page-hero .container{position:relative;z-index:2}
.page-hero h1{max-width:860px;margin-bottom:18px}
.page-hero h1 .tilt{display:inline-block;color:var(--bronze-l);position:relative}
.page-hero h1 .tilt::after{content:"";position:absolute;left:0;right:0;bottom:6px;height:8px;background:linear-gradient(90deg,var(--red),transparent);opacity:.5;z-index:-1}
.page-hero p.lead{max-width:720px;color:var(--paper-2);font-size:16px;margin-bottom:26px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px}
.hero-tags span{
  font-size:12.5px;letter-spacing:.1em;padding:7px 16px;border-radius:999px;
  background:rgba(176,141,87,.1);border:1px solid var(--line);color:var(--bronze-l);
}

/* ---------- 渐显动画 ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in-view{opacity:1;transform:none}
.reveal-l{opacity:0;transform:translateX(-44px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal-l.in-view{opacity:1;transform:none}
.reveal-r{opacity:0;transform:translateX(44px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal-r.in-view{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}
.d4{transition-delay:.32s}.d5{transition-delay:.4s}

/* 装饰元素：对角网格 / 斜线 */
.diag-grid{position:relative}
.diag-grid::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(135deg,rgba(176,141,87,.055) 1px,transparent 1px);
  background-size:34px 34px;
  mask-image:radial-gradient(720px 420px at 30% 30%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(720px 420px at 30% 30%,#000,transparent 75%);
}
.orn-line{width:72px;height:3px;background:var(--grad-bronze);border-radius:3px;margin:18px 0}
.orn-line--c{margin:18px auto}

/* 数字角标 */
.idx-num{
  font-family:var(--font-h);font-size:44px;line-height:1;
  background:var(--grad-bronze);-webkit-background-clip:text;background-clip:text;color:transparent;
  opacity:.9;
}

/* 返回顶部 */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:880;width:46px;height:46px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(24,19,13,.9);border:1px solid var(--line);color:var(--bronze-l);
  opacity:0;visibility:hidden;transform:translateY(16px);cursor:pointer;
  transition:.35s var(--ease);
}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--bronze);color:#221a10}
.to-top svg{width:18px;height:18px}

/* 悬浮电话 */
.float-tel{
  position:fixed;left:22px;bottom:26px;z-index:880;
  display:flex;align-items:center;gap:10px;padding:12px 20px;border-radius:999px;
  background:var(--grad-red);color:#f6e9d8;box-shadow:0 12px 30px rgba(138,47,47,.4);
  font-size:14px;font-weight:600;letter-spacing:.04em;
}
.float-tel svg{width:17px;height:17px}
.float-tel:hover{transform:translateY(-3px)}

/* ---------- 关键帧 ---------- */
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
@keyframes pulseDot{0%,100%{box-shadow:0 0 0 0 rgba(176,141,87,.5)}50%{box-shadow:0 0 0 9px rgba(176,141,87,0)}}
@keyframes shine{to{background-position:200% center}}
@keyframes ticker{to{transform:translateX(-50%)}}
@keyframes glitch{
  0%,92%,100%{transform:translate(0);opacity:1}
  94%{transform:translate(-2px,1px);opacity:.85}
  96%{transform:translate(2px,-1px);opacity:.92}
}

/* 分段数字动画（由 JS 触发） */
.count-num{font-variant-numeric:tabular-nums}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .foot-grid{grid-template-columns:1fr 1fr;gap:30px}
  .nav-list,.nav-cta{display:none}
  .nav-burger{display:flex}
  .mobile-menu{
    position:fixed;inset:0;z-index:899;background:rgba(15,12,9,.98);
    padding:100px 26px 40px;overflow:auto;
    opacity:0;visibility:hidden;transition:.35s var(--ease);
  }
  .mobile-menu.open{opacity:1;visibility:visible}
  .mobile-menu a{display:block;padding:14px 6px;font-size:17px;font-family:var(--font-h);color:var(--paper);border-bottom:1px solid var(--line-2)}
  .mobile-menu a:hover{color:var(--bronze-l)}
  .mobile-menu .sub{display:none;padding-left:16px}
  .mobile-menu .sub.open{display:block}
  .mobile-menu .sub a{font-size:14px;color:var(--paper-2);border-bottom:none;padding:9px 6px}
}
@media (max-width:640px){
  body{font-size:14.5px}
  .section{padding:60px 0}
  .foot-grid{grid-template-columns:1fr;gap:26px;padding:44px 0 30px}
  .page-hero{padding:120px 0 60px}
  .float-tel{right:22px;left:auto;bottom:80px}
  .to-top{bottom:80px;right:22px}
}