/* =========================================================
   /assets/site.css — 大阳城官网 共享样式
   夜航灯路系统：深靛底 / 琥珀光 / 粗边框 / 硬投影
   ========================================================= */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;color-scheme:dark;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
hr{border:0}

:root{
  --night:#0B1B33;
  --deep:#102A4C;
  --abyss:#07121F;
  --amber:#F2A93B;
  --signal:#D94A3D;
  --mist:#8FB8B2;
  --sand:#D9C48A;
  --foam:#F4F1EA;
  --haze:#C9D4DF;
  --edge:#2E4663;
  --focus:#FFD27A;

  --font-head:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-nav:"Noto Sans SC","PingFang SC",sans-serif;

  --shell:1240px;
  --gutter:clamp(1rem,4vw,2rem);
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-hard:6px 6px 0 rgba(7,18,31,.6);
}

body{
  min-height:100vh;
  background-color:var(--night);
  background-image:
    radial-gradient(70rem 44rem at 88% -12%, rgba(16,42,76,.9), transparent 62%),
    radial-gradient(46rem 28rem at -12% 6%, rgba(143,184,178,.09), transparent 72%);
  color:var(--foam);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;letter-spacing:-.01em;line-height:1.25}

:focus-visible{outline:3px solid var(--focus);outline-offset:3px}

/* ---------- 跳至主要内容 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-5rem;
  z-index:200;
  padding:.65rem 1.1rem;
  background:var(--amber);
  color:var(--abyss);
  border:2px solid var(--focus);
  font-family:var(--font-nav);
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.1em;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:.55rem}

/* ---------- 头部命令栏 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--abyss);
  border-bottom:2px solid var(--edge);
  box-shadow:0 12px 32px rgba(3,9,17,.55);
}
.site-header::before{
  content:"";
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--amber) 0%,var(--signal) 38%,rgba(46,70,99,0) 88%);
}
.header-bar{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:.5rem var(--gutter);
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.5rem 1.25rem;
}

.brand{
  order:1;
  display:flex;
  align-items:center;
  gap:.6rem;
  padding:.25rem 0;
  flex:0 0 auto;
}
.brand-mark{
  position:relative;
  display:block;
  width:.7rem;
  height:1.5rem;
  background:linear-gradient(180deg,var(--focus),var(--amber));
  box-shadow:0 0 16px rgba(242,169,59,.72);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:50%;
  top:100%;
  width:.32rem;
  height:.32rem;
  margin-top:.22rem;
  transform:translateX(-50%);
  background:var(--signal);
  box-shadow:0 0 10px rgba(217,74,61,.85);
}
.brand-text{display:flex;flex-direction:column;line-height:1.12}
.brand-name{
  font-family:var(--font-head);
  font-size:1.06rem;
  font-weight:800;
  letter-spacing:.04em;
  color:var(--foam);
}
.brand-sub{
  font-family:var(--font-nav);
  font-size:.6rem;
  font-weight:600;
  letter-spacing:.22em;
  color:var(--mist);
}

/* ---------- 导航 ---------- */
.site-nav{order:2;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:.1rem;flex-wrap:wrap}
.nav-list a{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:.42rem;
  padding:.55rem .68rem;
  font-family:var(--font-nav);
  font-size:.78rem;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--haze);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:.68rem;
  right:.68rem;
  bottom:.2rem;
  height:2px;
  background:var(--amber);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav-list a:hover,
.nav-list a:focus-visible{color:var(--focus);background:rgba(242,169,59,.08)}
.nav-list a:hover::after,
.nav-list a:focus-visible::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--amber)}
.nav-list a[aria-current="page"]::after{transform:scaleX(1)}
.nav-list a[aria-current="page"] .nav-index{color:var(--signal);opacity:1}
.nav-index{
  font-family:var(--font-nav);
  font-size:.6rem;
  font-weight:700;
  letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
  color:var(--mist);
  opacity:.6;
  transition:color .18s var(--ease),opacity .18s var(--ease);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{
  order:2;
  display:none;
  margin-left:auto;
  align-items:center;
  gap:.55rem;
  padding:.5rem .78rem;
  border:2px solid var(--edge);
  background:var(--deep);
  color:var(--foam);
  font-family:var(--font-nav);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.14em;
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible{border-color:var(--amber);color:var(--focus);background:rgba(242,169,59,.12)}
.nav-toggle-lines{
  position:relative;
  display:block;
  width:1rem;
  height:2px;
  background:currentColor;
}
.nav-toggle-lines::before,
.nav-toggle-lines::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle-lines::before{top:-5px}
.nav-toggle-lines::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines::after{top:0;transform:rotate(-45deg)}

/* ---------- 页脚航标底座 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,5.5rem);
  background:var(--abyss);
  border-top:2px solid var(--edge);
  color:var(--haze);
}
.site-footer::before{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg,rgba(46,70,99,0) 0%,var(--amber) 22%,var(--signal) 62%,rgba(46,70,99,0) 100%);
  opacity:.8;
}
.footer-inner{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(2.2rem,5vw,3.4rem) var(--gutter) clamp(1.6rem,3vw,2.2rem);
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);
  gap:clamp(1.8rem,4vw,3.2rem);
}
.footer-brand-name{
  font-family:var(--font-head);
  font-size:clamp(1.4rem,3vw,1.75rem);
  font-weight:800;
  letter-spacing:.04em;
  color:var(--foam);
}
.footer-tagline{
  margin-top:.7rem;
  max-width:32ch;
  font-size:.94rem;
  line-height:1.8;
  color:var(--mist);
}
.footer-links{
  display:flex;
  flex-wrap:wrap;
  gap:.6rem 1.2rem;
  margin-top:1.7rem;
}
.footer-links a{
  font-family:var(--font-nav);
  font-size:.78rem;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--foam);
  padding-bottom:.18rem;
  border-bottom:1px solid var(--edge);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-links a:hover,
.footer-links a:focus-visible{color:var(--focus);border-bottom-color:var(--amber)}
.footer-label{
  font-family:var(--font-nav);
  font-size:.68rem;
  font-weight:700;
  letter-spacing:.26em;
  color:var(--sand);
  margin-bottom:.95rem;
}
.footer-contact-list{display:grid;gap:.75rem}
.footer-contact-list li{
  display:flex;
  gap:.9rem;
  font-size:.875rem;
  line-height:1.7;
  color:var(--haze);
  overflow-wrap:anywhere;
  padding-left:.7rem;
  border-left:2px solid rgba(46,70,99,.85);
}
.footer-contact-list span{
  flex:0 0 4.4rem;
  font-family:var(--font-nav);
  font-size:.68rem;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--mist);
  padding-top:.22rem;
}
.footer-base{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:1.1rem var(--gutter) 2.2rem;
  border-top:1px solid var(--edge);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:.4rem 1.5rem;
  font-family:var(--font-nav);
  font-size:.74rem;
  letter-spacing:.06em;
  color:var(--mist);
}

/* ---------- 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(2.6rem,6vw,5rem)}
.section-head{max-width:62ch;margin-bottom:clamp(1.4rem,3vw,2.4rem)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.65rem;
  font-family:var(--font-nav);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.26em;
  color:var(--sand);
}
.eyebrow::before{
  content:"";
  width:1.7rem;
  height:2px;
  background:var(--amber);
  box-shadow:0 0 10px rgba(242,169,59,.7);
}
.section-title{
  margin-top:.85rem;
  font-size:clamp(1.5rem,2.6vw,2rem);
  font-weight:800;
  color:var(--foam);
}
.section-lead{
  margin-top:.9rem;
  max-width:64ch;
  font-size:1rem;
  line-height:1.8;
  color:var(--haze);
}
.rule{
  height:2px;
  margin-block:clamp(1.6rem,4vw,2.6rem);
  background:linear-gradient(90deg,var(--edge) 0%,rgba(46,70,99,0) 100%);
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(1rem,2.4vw,1.6rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- 正文长文本 ---------- */
.prose{
  max-width:68ch;
  font-size:1rem;
  line-height:1.85;
  color:var(--haze);
}
.prose p + p{margin-top:1rem}
.prose h2,.prose h3{
  color:var(--foam);
  margin-top:2rem;
  margin-bottom:.7rem;
}
.prose h2{font-size:1.6rem}
.prose h3{font-size:1.18rem}
.prose ul,.prose ol{margin-top:.9rem;display:grid;gap:.55rem}
.prose li{position:relative;padding-left:1.25rem}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.75em;
  width:.42rem;
  height:.42rem;
  background:var(--amber);
}
.prose a{
  color:var(--foam);
  border-bottom:1px solid var(--amber);
  transition:color .18s var(--ease);
}
.prose a:hover,.prose a:focus-visible{color:var(--focus)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-nav);
  font-size:.74rem;
  letter-spacing:.08em;
  color:var(--mist);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}
.breadcrumb li + li::before{content:"/";margin-right:.5rem;color:var(--edge)}
.breadcrumb a{color:var(--haze);transition:color .18s var(--ease)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--focus)}
.breadcrumb [aria-current="page"]{color:var(--sand)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6rem;
  padding:.8rem 1.35rem;
  border:2px solid var(--edge);
  background:transparent;
  color:var(--foam);
  font-family:var(--font-nav);
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.12em;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover,.btn:focus-visible{border-color:var(--amber);color:var(--focus)}
.btn:active{transform:translateY(1px)}
.btn--amber{
  background:var(--amber);
  border-color:var(--amber);
  color:var(--abyss);
  box-shadow:var(--shadow-hard);
}
.btn--amber:hover,.btn--amber:focus-visible{
  background:var(--focus);
  border-color:var(--focus);
  color:var(--abyss);
  box-shadow:4px 4px 0 rgba(7,18,31,.7);
}
.btn--ghost{border-color:var(--edge);color:var(--haze)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--mist);color:var(--foam);background:rgba(143,184,178,.08)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.28rem .62rem;
  border:1px solid var(--edge);
  background:rgba(16,42,76,.6);
  color:var(--mist);
  font-family:var(--font-nav);
  font-size:.68rem;
  font-weight:700;
  letter-spacing:.14em;
}
.tag--signal{
  border-color:var(--signal);
  background:rgba(217,74,61,.14);
  color:#F3A79F;
}
.tag--mist{
  border-color:rgba(143,184,178,.5);
  color:var(--mist);
}
.tag--sand{
  border-color:rgba(217,196,138,.45);
  color:var(--sand);
}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.6rem);
  background:linear-gradient(180deg,rgba(16,42,76,.88),rgba(11,27,51,.9));
  border:2px solid var(--edge);
  box-shadow:var(--shadow-hard);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease);
}
.card:hover{
  border-color:rgba(242,169,59,.65);
  box-shadow:6px 6px 0 rgba(242,169,59,.2);
  transform:translate(-1px,-1px);
}
.card-title{
  font-family:var(--font-head);
  font-size:1.15rem;
  font-weight:800;
  line-height:1.35;
  color:var(--foam);
}

/* ---------- 图片容器基础规则（页面阶段放占位图） ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  isolation:isolate;
  aspect-ratio:16 / 10;
  border:2px solid var(--edge);
  background:
    radial-gradient(80% 70% at 74% 10%, rgba(242,169,59,.22), transparent 62%),
    linear-gradient(180deg,rgba(16,42,76,.95),rgba(7,18,31,.98));
  box-shadow:8px 8px 0 rgba(7,18,31,.6);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame figcaption{
  position:absolute;
  left:0;
  bottom:0;
  padding:.55rem .85rem;
  border-top:2px solid var(--edge);
  border-right:2px solid var(--edge);
  background:rgba(7,18,31,.85);
  color:var(--haze);
  font-family:var(--font-nav);
  font-size:.7rem;
  letter-spacing:.12em;
}

/* ---------- 阅读进度光带（JS 注入） ---------- */
.scroll-rail{
  position:fixed;
  inset:0 0 auto 0;
  height:3px;
  z-index:120;
  pointer-events:none;
  background:rgba(46,70,99,.4);
}
.scroll-rail-fill{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--amber),var(--signal));
  box-shadow:0 0 12px rgba(242,169,59,.75);
}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  .footer-inner{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 移动：导航折叠 ---------- */
@media (max-width:880px){
  .nav-toggle{display:flex;order:2}
  .site-nav{
    order:3;
    flex:1 0 100%;
    margin-left:0;
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    transition:max-height .34s var(--ease),opacity .22s var(--ease);
  }
  .site-nav[data-open]{
    max-height:34rem;
    opacity:1;
    visibility:visible;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-top:.55rem;
    padding-block:.4rem .6rem;
    border-top:1px solid var(--edge);
  }
  .nav-list a{
    padding:.8rem .7rem;
    font-size:.84rem;
    border-left:3px solid transparent;
    border-bottom:1px solid rgba(46,70,99,.5);
  }
  .nav-list a::after{display:none}
  .nav-list a[aria-current="page"]{
    border-left-color:var(--amber);
    background:rgba(242,169,59,.1);
  }
  .nav-list a:hover,
  .nav-list a:focus-visible{border-left-color:var(--mist)}
}

/* ---------- 小屏 ---------- */
@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .brand-sub{display:none}
  .footer-contact-list li{flex-direction:column;gap:.15rem}
  .footer-contact-list span{flex:none;padding-top:0}
  .footer-base{flex-direction:column}
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .card:hover{transform:none}
  .btn:active{transform:none}
}