@charset "UTF-8";
/* ============================================================
   ntcpk.com · 全站共享基础样式  style.css
   风格：校园展板风 —— 藏青 + 纯白 + 浅金
   说明：本文件只承载全站通用基建（变量/排版/顶栏/导航/页脚/
         按钮/表单/面包屑/首屏/CTA/渐入动画/响应式工具类）。
         每个页面的独有布局由 css/pages/<页面名>.css 负责，
         保证页面间骨架互不重复。
   兼容：PC / 平板 / 手机，现代浏览器（Chrome / Edge / Firefox / Safari）
============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  /* 藏青系 */
  --navy-950:#10182E;
  --navy-900:#141C33;
  --navy-800:#1F2B4E;
  --navy-700:#27365F;
  --navy-600:#33446F;
  --navy-500:#4A5B88;
  /* 浅金系 */
  --gold-500:#C9A96A;
  --gold-400:#D8BC8A;
  --gold-300:#E6D3A8;
  --gold-200:#F0E4C6;
  /* 白与中性色 */
  --white:#FFFFFF;
  --paper:#F8F6F0;          /* 展板纸感浅底 */
  --paper-deep:#F1EDE2;
  --ink:#23272F;            /* 正文深色 */
  --ink-2:#4A505C;
  --muted:#7C8290;
  --line:#E4E0D4;           /* 浅金灰分隔线 */
  --line-navy:rgba(255,255,255,.14);
  /* 字体 */
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB","Noto Sans SC",sans-serif;
  --font-head:"Microsoft YaHei","PingFang SC","Noto Sans SC",-apple-system,"Segoe UI",sans-serif;
  /* 圆弧异形参数 */
  --r-sm:10px;
  --r-md:18px;
  --r-lg:28px;
  --r-xl:44px;
  --r-pill:999px;
  /* 阴影 */
  --shadow-sm:0 4px 14px rgba(20,28,51,.08);
  --shadow-md:0 12px 32px rgba(20,28,51,.12);
  --shadow-lg:0 24px 60px rgba(20,28,51,.18);
  --shadow-gold:0 10px 30px rgba(201,169,106,.35);
  /* 布局 */
  --container:1200px;
  --header-h:76px;
  --topbar-h:40px;
  /* 过渡 */
  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:.25s var(--ease);
  --t-med:.45s var(--ease);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none;transition:color var(--t-fast)}
button{font:inherit;border:0;background:none;cursor:pointer;color:inherit}
input,textarea,select{font:inherit;color:inherit}
h1,h2,h3,h4,h5,h6{font-family:var(--font-head);line-height:1.3;font-weight:800;color:var(--navy-900)}
strong,b{font-weight:700}
::selection{background:var(--gold-400);color:var(--navy-900)}

/* 页面载入过渡 */
body{animation:pageIn .6s ease both}
@keyframes pageIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- 通用工具类 ---------- */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:92px 0;position:relative}
.section-sm{padding:56px 0}
.section-tight{padding:64px 0}
.bg-paper{background:var(--paper)}
.bg-navy{background:var(--navy-800);color:#EAEDF5}
.bg-navy h1,.bg-navy h2,.bg-navy h3,.bg-navy h4{color:var(--white)}
.bg-navy .sec-desc{color:#C6CDDE}
.text-gold{color:var(--gold-500)}
.text-navy{color:var(--navy-800)}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.hidden-mobile{}

/* 栅格工具 */
.grid{display:grid;gap:28px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 30px;border-radius:var(--r-pill);
  font-family:var(--font-head);font-size:15px;font-weight:700;letter-spacing:1px;
  transition:transform var(--t-fast),box-shadow var(--t-fast),background var(--t-fast),color var(--t-fast);
  white-space:nowrap;line-height:1.2;
}
.btn svg{width:18px;height:18px;flex:none}
.btn-gold{
  background:linear-gradient(135deg,var(--gold-400),var(--gold-500) 55%,#B8934F);
  color:var(--navy-900);
  box-shadow:var(--shadow-gold);
}
.btn-gold:hover{transform:translateY(-3px);box-shadow:0 16px 38px rgba(201,169,106,.45);color:var(--navy-900)}
.btn-navy{background:var(--navy-800);color:var(--white);box-shadow:var(--shadow-sm)}
.btn-navy:hover{transform:translateY(-3px);background:var(--navy-700);box-shadow:var(--shadow-md);color:var(--white)}
.btn-light{background:var(--white);color:var(--navy-800);box-shadow:var(--shadow-sm)}
.btn-light:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);color:var(--navy-800)}
.btn-outline{background:transparent;color:var(--navy-800);border:1.5px solid var(--navy-800)}
.btn-outline:hover{background:var(--navy-800);color:var(--white)}
.btn-outline-light{background:transparent;color:var(--white);border:1.5px solid rgba(255,255,255,.75)}
.btn-outline-light:hover{background:var(--white);color:var(--navy-800)}
.btn-xl{padding:17px 40px;font-size:16px}

/* ---------- 顶部联系方式条 ---------- */
.topbar{
  height:var(--topbar-h);
  background:var(--navy-950);
  color:#B9C1D4;
  font-size:13px;
  position:relative;z-index:60;
}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.topbar-links{display:flex;align-items:center;gap:26px}
.topbar-links a{display:inline-flex;align-items:center;gap:7px;transition:color var(--t-fast)}
.topbar-links a:hover{color:var(--gold-400)}
.topbar-links svg{width:15px;height:15px;color:var(--gold-500);flex:none}
.topbar-tip{color:var(--gold-300);letter-spacing:1px}
.topbar-tip b{color:var(--gold-400);font-weight:700}

/* ---------- 站点头部 / 导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:background var(--t-med),box-shadow var(--t-med),transform var(--t-med);
}
.header-main{display:flex;align-items:center;height:var(--header-h);position:relative;z-index:2}
.logo{display:inline-flex;align-items:center;gap:12px;flex:none}
.logo img{width:46px;height:46px;border-radius:12px;object-fit:cover}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-name{font-family:var(--font-head);font-size:21px;font-weight:800;color:var(--white);letter-spacing:1px}
.logo-sub{font-size:11px;color:rgba(255,255,255,.68);letter-spacing:2px}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:6px}
.site-nav > ul{display:flex;align-items:center;gap:2px}
.site-nav a.nav-link{
  display:block;padding:10px 15px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;color:rgba(255,255,255,.92);
  position:relative;transition:color var(--t-fast),background var(--t-fast);
}
.site-nav a.nav-link:hover{color:var(--gold-300);background:rgba(255,255,255,.08)}
.site-nav a.nav-link.active{color:var(--gold-300)}
.site-nav a.nav-link.active::after{
  content:"";position:absolute;left:50%;bottom:2px;transform:translateX(-50%);
  width:18px;height:3px;border-radius:3px;background:var(--gold-500);
}
.nav-cta{margin-left:14px}
.nav-toggle{display:none}

/* 滚动后：白底藏青字（顶栏随头部整体上移收起） */
.site-header.scrolled{
  transform:translateY(calc(-1 * var(--topbar-h)));
  background:rgba(255,255,255,.96);
  box-shadow:0 4px 22px rgba(20,28,51,.1);
  backdrop-filter:blur(8px);
}
.site-header.scrolled .logo-name{color:var(--navy-900)}
.site-header.scrolled .logo-sub{color:var(--muted)}
.site-header.scrolled .site-nav a.nav-link{color:var(--navy-800)}
.site-header.scrolled .site-nav a.nav-link:hover{color:var(--navy-600);background:rgba(31,43,78,.06)}
.site-header.scrolled .site-nav a.nav-link.active{color:var(--navy-800)}
.site-header.scrolled .site-nav a.nav-link.active::after{background:var(--gold-500)}
.site-header.scrolled .nav-toggle span{background:var(--navy-800)}

/* ---------- 页面首屏（内页统一暗色首屏 + 面包屑） ---------- */
.page-hero{
  position:relative;overflow:hidden;
  background:linear-gradient(150deg,var(--navy-950) 0%,var(--navy-800) 55%,#2B3A63 100%);
  color:#E8EBF4;padding:180px 0 110px;
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:26px 26px;
  opacity:.5;
}
.page-hero .deco-arc{position:absolute;border-radius:50%;border:1.5px solid rgba(201,169,106,.25)}
.page-hero .deco-arc.a{width:420px;height:420px;right:-120px;top:-140px}
.page-hero .deco-arc.b{width:260px;height:260px;left:-80px;bottom:-90px;border-color:rgba(255,255,255,.12)}
.hero-inner{position:relative;z-index:2;display:flex;align-items:flex-end;justify-content:space-between;gap:32px}
.hero-crumb{font-size:13px;color:#AEB6CB;display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:16px}
.hero-crumb a{color:#C8CEDF;transition:color var(--t-fast)}
.hero-crumb a:hover{color:var(--gold-400)}
.hero-crumb .sep{color:var(--gold-500)}
.hero-crumb .cur{color:var(--gold-300)}
.hero-title{
  font-size:clamp(28px,4.2vw,46px);line-height:1.22;color:var(--white);
  letter-spacing:1px;margin-bottom:14px;
}
.hero-title em{font-style:normal;color:var(--gold-400)}
.hero-lead{font-size:16px;color:#C3CADD;max-width:640px;line-height:1.9}
.hero-side{flex:none;text-align:right}
.hero-side .tel-big{
  font-family:var(--font-head);font-size:clamp(22px,2.4vw,30px);font-weight:800;
  color:var(--gold-300);letter-spacing:1px;display:flex;align-items:center;gap:10px;justify-content:flex-end;
}
.hero-side .tel-big svg{width:26px;height:26px}
.hero-side .tel-note{font-size:12px;color:#8E97AE;letter-spacing:2px;margin-top:4px}

/* ---------- 区块标题 ---------- */
.sec-head{max-width:760px;margin-bottom:52px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;font-weight:700;letter-spacing:4px;color:var(--gold-500);
  margin-bottom:14px;
}
.sec-eyebrow::before{content:"";width:34px;height:2px;background:linear-gradient(90deg,transparent,var(--gold-500))}
.sec-eyebrow.after::after{content:"";width:34px;height:2px;background:linear-gradient(90deg,var(--gold-500),transparent)}
.center .sec-eyebrow::before{background:linear-gradient(90deg,transparent,var(--gold-500))}
.center .sec-eyebrow.after::after{background:linear-gradient(90deg,var(--gold-500),transparent)}
.sec-title{font-size:clamp(26px,3.4vw,38px);letter-spacing:1px;margin-bottom:16px;color:var(--navy-900)}
.sec-title em{font-style:normal;color:var(--gold-500)}
.sec-desc{font-size:15.5px;color:var(--ink-2);line-height:1.95;margin-bottom:8px}
.bg-navy .sec-title{color:var(--white)}
.bg-navy .sec-desc{color:#C6CDDE}

/* ---------- 面包屑（页面正文内的次级面包屑，备选） ---------- */
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.crumb a{color:var(--navy-600)}
.crumb a:hover{color:var(--gold-500)}
.crumb .sep{color:var(--gold-500)}

/* ---------- 滚动渐入动画 ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .8s var(--ease),transform .8s var(--ease);transition-delay:var(--d,0s)}
.reveal-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  body{animation:none}
}

/* ---------- 页面底部 CTA 带 ---------- */
.cta-band{
  position:relative;overflow:hidden;
  background:linear-gradient(135deg,var(--navy-950) 0%,var(--navy-800) 60%,#2E3D68 100%);
  color:var(--white);padding:84px 0;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(201,169,106,.14) 1px,transparent 1px);
  background-size:24px 24px;
}
.cta-band .container{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap}
.cta-title{font-size:clamp(24px,3vw,34px);color:var(--white);margin-bottom:10px;letter-spacing:1px}
.cta-title em{font-style:normal;color:var(--gold-400)}
.cta-desc{color:#C6CDDE;max-width:600px;font-size:15px;line-height:1.9}
.cta-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.cta-tel{display:inline-flex;align-items:center;gap:12px}
.cta-tel svg{width:34px;height:34px;color:var(--gold-400)}
.cta-tel .num{font-family:var(--font-head);font-size:24px;font-weight:800;color:var(--gold-300);letter-spacing:1px}
.cta-tel .lab{font-size:12px;color:#9AA3BC;letter-spacing:2px}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--navy-950);color:#AEB6CB;position:relative;overflow:hidden}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;
  background:linear-gradient(90deg,var(--gold-500),var(--gold-300) 30%,transparent 60%);
}
.footer-main{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:48px;padding:72px 0 48px}
.footer-brand .logo{margin-bottom:20px}
.footer-brand .logo-name{color:var(--white)}
.footer-brand .logo-sub{color:#8E97AE}
.footer-about{font-size:14px;line-height:1.95;color:#9AA3BC;margin-bottom:22px;max-width:340px}
.footer-social{display:flex;gap:12px}
.footer-social a{
  width:40px;height:40px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid rgba(255,255,255,.16);color:#C8CEDF;
  transition:all var(--t-fast);
}
.footer-social a:hover{background:var(--gold-500);border-color:var(--gold-500);color:var(--navy-900);transform:translateY(-3px)}
.footer-social svg{width:17px;height:17px}
.footer-h{font-size:15px;font-weight:700;color:var(--white);letter-spacing:2px;margin-bottom:22px;position:relative;padding-bottom:10px}
.footer-h::after{content:"";position:absolute;left:0;bottom:0;width:28px;height:2px;background:var(--gold-500)}
.footer-links li{margin-bottom:11px}
.footer-links a{font-size:14px;color:#9AA3BC;display:inline-flex;align-items:center;gap:8px;transition:all var(--t-fast)}
.footer-links a::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--gold-500);opacity:.6}
.footer-links a:hover{color:var(--gold-300);transform:translateX(4px)}
.footer-contact li{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px;font-size:14px;color:#9AA3BC}
.footer-contact svg{width:18px;height:18px;color:var(--gold-500);flex:none;margin-top:3px}
.footer-contact a{color:#C8CEDF}
.footer-contact a:hover{color:var(--gold-300)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:20px 0;font-size:13px;color:#7E87A0;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.footer-bottom a{color:#9AA3BC}
.footer-bottom a:hover{color:var(--gold-300)}

/* ---------- 返回顶部 ---------- */
.backtop{
  position:fixed;right:26px;bottom:30px;z-index:40;
  width:48px;height:48px;border-radius:50%;
  background:var(--navy-800);color:var(--gold-300);
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(16px);
  transition:all var(--t-med);
}
.backtop.show{opacity:1;visibility:visible;transform:none}
.backtop:hover{background:var(--navy-700);transform:translateY(-3px)}
.backtop svg{width:20px;height:20px}

/* ---------- 表单 ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:14px;font-weight:600;color:var(--navy-800);margin-bottom:8px}
.field label i{color:var(--gold-500);font-style:normal}
.field input,.field textarea,.field select{
  width:100%;padding:13px 16px;border:1.5px solid var(--line);
  border-radius:12px;background:var(--white);color:var(--ink);
  transition:border-color var(--t-fast),box-shadow var(--t-fast);outline:none;
}
.field textarea{min-height:140px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{
  border-color:var(--gold-500);box-shadow:0 0 0 4px rgba(201,169,106,.16);
}
.field ::placeholder{color:#A9AEBB}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .footer-main{grid-template-columns:1fr 1fr;gap:40px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:920px){
  .section{padding:72px 0}
  .topbar{display:none}
  .site-header.scrolled{transform:none}
  .nav-toggle{
    display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
    width:44px;height:44px;margin-left:12px;padding:10px;border-radius:10px;
  }
  .nav-toggle span{display:block;height:2px;width:22px;background:var(--white);border-radius:2px;transition:all var(--t-med)}
  .site-header.scrolled .nav-toggle span{background:var(--navy-800)}
  .nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .site-nav{
    position:fixed;top:0;right:0;bottom:0;z-index:90;
    width:min(320px,84vw);background:var(--navy-900);
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    padding:96px 28px 40px;gap:6px;
    transform:translateX(100%);transition:transform var(--t-med);
    box-shadow:-20px 0 50px rgba(0,0,0,.25);
  }
  .site-nav.open{transform:none}
  .site-nav > ul{flex-direction:column;align-items:stretch;gap:4px;width:100%}
  .site-nav a.nav-link{color:var(--white);font-size:17px;padding:13px 16px;border-radius:12px}
  .site-nav a.nav-link:hover,.site-nav a.nav-link.active{background:rgba(201,169,106,.12);color:var(--gold-300)}
  .site-nav a.nav-link.active::after{display:none}
  .nav-cta{margin:18px 0 0}
  .nav-cta .btn{width:100%}
  .hero-side{display:none}
}
@media (max-width:768px){
  .page-hero{padding:150px 0 84px}
  .grid-3,.grid-4{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .sec-head{margin-bottom:38px}
  .cta-band{padding:64px 0}
  .footer-main{grid-template-columns:1fr;gap:36px;padding:56px 0 32px}
  .footer-bottom{flex-direction:column;text-align:center}
  .cta-actions{width:100%}
  .cta-tel .num{font-size:20px}
}
@media (max-width:480px){
  .container{padding:0 18px}
  .section{padding:60px 0}
  .btn{padding:13px 24px}
}