/* ===== 基础变量 ===== */
:root{
  --c-blue:#1B5B8A;
  --c-deep:#0F2A43;
  --c-snow:#F7FAFC;
  --c-paper:#F7F1E5;
  --c-orange:#E8692F;
  --c-orange-deep:#C0440B;
  --c-grayblue:#D7E1E8;
  --c-sand:#E7D8B8;
  --c-ink:#1F2933;
  --c-muted:#5C6B7A;
  --c-border:#B8C6D2;
  --font-body:'PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-tech:'SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --container:1200px;
  --header-w:280px;
  --dur:250ms;
  --shadow-1:0 2px 0 rgba(15,42,67,.12);
  --shadow-2:0 10px 20px rgba(15,42,67,.18);
}
/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  color:var(--c-ink);
  background:var(--c-snow);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--c-blue);text-decoration:none}
a:hover{color:var(--c-orange-deep)}
ul,ol{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none}
h1,h2,h3,h4{font-weight:800;color:var(--c-deep);line-height:1.15}
main:focus{outline:none}
:focus-visible{outline:3px solid var(--c-orange);outline-offset:2px}
::selection{background:var(--c-orange);color:#fff}
/* ===== 通用容器和工具类 ===== */
.container{width:min(100% - 48px,var(--container));margin-inline:auto}
.section{padding:80px 0}
.section--paper{background:var(--c-paper)}
.section--blue{background:var(--c-blue)}
.section--deep{background:var(--c-deep)}
.section__kicker{
  font-family:var(--font-tech);
  font-size:.9rem;
  letter-spacing:.12em;
  color:var(--c-orange);
  text-transform:uppercase;
  margin-bottom:10px;
  display:block;
}
.section__title{font-size:clamp(28px,4vw,48px);font-weight:900;letter-spacing:-.02em}
.section__lead{font-size:1.06rem;color:var(--c-muted);max-width:680px;margin-top:12px}
/* 框架首屏 */
.frame-device{
  position:relative;
  border:3px solid var(--c-deep);
  background:var(--c-snow);
  box-shadow:10px 10px 0 var(--c-blue);
  margin:24px;
}
.frame-device::before{
  content:"";
  position:absolute;
  inset:12px;
  border:1px solid var(--c-grayblue);
  pointer-events:none;
}
.frame-device::after{
  content:"6686 — QINGHAI VIEW / SCALE 1:1";
  position:absolute;
  right:-3px;
  bottom:20px;
  writing-mode:vertical-rl;
  font-family:var(--font-tech);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--c-blue);
  background:var(--c-snow);
  padding:4px 6px;
  border:1px solid var(--c-grayblue);
}
.frame-device__topbar{
  position:relative;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 20px;
  border-bottom:3px solid var(--c-deep);
  font-family:var(--font-tech);
  font-size:13px;
  color:var(--c-deep);
}
.frame-device__topbar span:first-child::before{
  content:"⬡ ";
  color:var(--c-orange);
}
.frame-device__readout{
  display:flex;
  gap:24px;
  padding:14px 20px;
  border-top:1px solid var(--c-grayblue);
  font-family:var(--font-tech);
  font-size:.86rem;
  color:var(--c-muted);
}
.frame-device__readout strong{
  color:var(--c-deep);
  font-weight:700;
}
/* 几何背景线 */
.geo-lines{
  height:30px;
  background:
    repeating-linear-gradient(135deg,
      transparent 0px,transparent 12px,
      var(--c-grayblue) 12px,var(--c-grayblue) 14px);
  border-block:1px solid var(--c-grayblue);
  margin-top:-1px;
}
/* 图片框架 */
.img-frame{
  position:relative;
  border:2px solid var(--c-deep);
  background:var(--c-grayblue);
  overflow:hidden;
  aspect-ratio:3/2;
}
.img-frame::after{
  content:"IMG/6686-"counter(imgnum,decimal-leading-zero);
  counter-increment:imgnum;
  position:absolute;
  left:0;
  bottom:0;
  padding:4px 10px;
  font-family:var(--font-tech);
  font-size:12px;
  color:var(--c-snow);
  background:var(--c-deep);
  letter-spacing:.1em;
}
.img-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.85);
}
.img-frame--wide{aspect-ratio:21/10}
.img-frame--square{aspect-ratio:1/1}
/* 按钮 */
.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:12px 22px;
  border:2px solid var(--c-deep);
  font-weight:700;
  font-size:.95rem;
  line-height:1;
  color:var(--c-deep);
  background:var(--c-snow);
  box-shadow:3px 3px 0 var(--c-deep);
  transition:transform var(--dur) ease,box-shadow var(--dur) ease,background var(--dur) ease;
}
.button:hover{
  transform:translate(-2px,-2px);
  box-shadow:5px 5px 0 var(--c-deep);
  color:var(--c-deep);
  background:var(--c-paper);
}
.button--primary{
  background:var(--c-orange);
  color:#fff;
  border-color:var(--c-deep);
  box-shadow:4px 4px 0 var(--c-deep);
}
.button--primary:hover{
  background:var(--c-orange-deep);
  color:#fff;
}
.button--skew{transform:skewX(-4deg)}
.button--skew:hover{transform:skewX(-4deg) translate(-2px,-2px)}
/* skip link */
.skip-link{
  position:fixed;
  top:-48px;
  left:16px;
  z-index:9999;
  background:var(--c-orange);
  color:#fff;
  padding:10px 18px;
  font-weight:700;
  border-radius:0 0 4px 4px;
  transition:top .2s ease;
}
.skip-link:focus{top:0;color:#fff}
/* ===== 头部 ===== */
.site-header{
  position:fixed;
  top:0;
  left:0;
  width:var(--header-w);
  height:100vh;
  background:var(--c-deep);
  color:var(--c-snow);
  display:flex;
  flex-direction:column;
  z-index:1000;
  border-right:3px solid var(--c-orange);
}
.site-header__bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:24px 20px;
  border-bottom:1px solid rgba(215,225,232,.2);
}
.site-brand{
  display:flex;
  align-items:center;
  gap:12px;
  color:var(--c-snow);
}
.site-brand:hover{color:var(--c-sand)}
.site-brand__mark{
  width:46px;
  height:46px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.1rem;
  font-weight:900;
  color:#fff;
  background:var(--c-orange);
  border:2px solid #fff;
  transform:rotate(-6deg);
  line-height:1;
  font-family:var(--font-tech);
}
.site-brand__name{
  display:block;
  font-size:1.25rem;
  font-weight:900;
  letter-spacing:.02em;
  line-height:1.1;
  transform:skewX(-4deg);
}
.site-brand__sub{
  display:block;
  font-family:var(--font-tech);
  font-size:.66rem;
  letter-spacing:.12em;
  color:var(--c-grayblue);
  margin-top:3px;
}
.nav-toggle{
  display:none;
  width:42px;
  height:42px;
  position:relative;
  z-index:1101;
  border:2px solid var(--c-snow);
  background:transparent;
}
.nav-toggle__icon,.nav-toggle__icon::before,.nav-toggle__icon::after{
  content:"";
  position:absolute;
  left:8px;
  width:22px;
  height:2px;
  background:var(--c-snow);
  transition:transform .25s ease,opacity .2s ease;
}
.nav-toggle__icon{top:19px}
.nav-toggle__icon::before{top:-7px}
.nav-toggle__icon::after{top:7px}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon{
  background:transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{
  transform:translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after{
  transform:translateY(-7px) rotate(-45deg);
}
.site-nav{
  flex:1;
  display:flex;
  flex-direction:column;
  padding:20px 0;
  overflow-y:auto;
}
.site-nav__main ul{display:flex;flex-direction:column}
.site-nav__main a{
  display:flex;
  align-items:center;
  gap:14px;
  padding:12px 20px 12px 28px;
  color:var(--c-snow);
  font-weight:600;
  font-size:.98rem;
  border-left:3px solid transparent;
  transition:background .2s,color .2s,border-color .2s;
}
.site-nav__main a::before{
  content:"/";
  font-family:var(--font-tech);
  color:var(--c-orange);
  font-size:.86rem;
  opacity:0;
  margin-left:-10px;
}
.site-nav__main a:hover{
  color:#fff;
  background:rgba(27,91,138,.45);
}
.site-nav__main a[aria-current="page"]{
  color:#fff;
  background:var(--c-blue);
  border-left-color:var(--c-orange);
}
.site-nav__main a[aria-current="page"]::before{
  opacity:1;
  content:"▸ ";
  color:var(--c-orange);
}
.nav-cta{
  margin:12px 20px 20px;
  justify-content:center;
}
.nav-meta{
  margin-top:auto;
  padding:16px 20px;
  border-top:1px solid rgba(215,225,232,.15);
  font-family:var(--font-tech);
  font-size:.74rem;
  color:var(--c-grayblue);
  display:flex;
  flex-direction:column;
  gap:4px;
}
/* ===== 页脚 ===== */
.site-footer{
  background:var(--c-deep);
  color:var(--c-snow);
  border-top:4px solid var(--c-orange);
  margin-top:80px;
  position:relative;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:100%;
  pointer-events:none;
  background:
    linear-gradient(90deg,transparent 0%,transparent 94%,rgba(231,216,184,.08) 94%,rgba(231,216,184,.08) 100%),
    linear-gradient(0deg,transparent 0%,transparent 97%,rgba(231,216,184,.05) 97%,rgba(231,216,184,.05) 100%);
  background-size:60px 60px;
}
.site-footer__inner{
  position:relative;
  padding:64px 0 48px;
}
.site-footer__grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.6fr;
  gap:48px;
}
.footer-brand__logo{
  font-size:1.7rem;
  font-weight:900;
  font-style:italic;
  color:var(--c-snow);
  letter-spacing:.02em;
}
.footer-brand__logo:hover{color:var(--c-sand)}
.footer-brand__slogan{
  margin-top:10px;
  color:var(--c-grayblue);
  font-size:1rem;
}
.footer-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:20px;
  padding:6px 12px;
  border:1px solid rgba(215,225,232,.4);
  font-family:var(--font-tech);
  font-size:.8rem;
  color:var(--c-sand);
}
.footer-status__dot{
  width:8px;
  height:8px;
  background:var(--c-orange);
  border-radius:0;
}
.footer-heading{
  font-size:.86rem;
  font-weight:800;
  color:var(--c-snow);
  letter-spacing:.12em;
  text-transform:uppercase;
  padding-bottom:10px;
  margin-bottom:14px;
  border-bottom:1px solid rgba(215,225,232,.2);
}
.footer-heading::before{
  content:attr(data-index);
  font-family:var(--font-tech);
  color:var(--c-orange);
  margin-right:8px;
}
.footer-links__list li+li,.footer-contact__list li+li{margin-top:8px}
.footer-links__list a,.footer-contact__list a{
  color:var(--c-grayblue);
  font-size:.92rem;
}
.footer-links__list a:hover,.footer-contact__list a:hover{
  color:var(--c-orange);
}
.footer-contact__list li{
  color:var(--c-grayblue);
  font-size:.88rem;
  padding-left:16px;
  position:relative;
}
.footer-contact__list li::before{
  content:"→";
  position:absolute;
  left:0;
  color:var(--c-orange);
  font-family:var(--font-tech);
  font-size:.8rem;
}
.footer-contact__service{
  margin-top:12px;
  padding-top:12px;
  border-top:1px dashed rgba(215,225,232,.2);
}
.footer-icp{
  margin-top:24px;
  padding-top:16px;
  border-top:1px solid rgba(215,225,232,.2);
  display:flex;
  flex-direction:column;
  gap:4px;
  font-family:var(--font-tech);
  font-size:.8rem;
  color:var(--c-grayblue);
}
/* ===== 等高线/斜切装饰元素 ===== */
.athletic-stripe{
  height:8px;
  background:repeating-linear-gradient(-45deg,var(--c-orange),var(--c-orange) 8px,var(--c-deep) 8px,var(--c-deep) 16px);
}
/* ===== 标签页 ===== */
.track-tabs{display:flex;flex-wrap:wrap;gap:0;border-bottom:2px solid var(--c-deep)}
.track-tabs [role="tab"]{
  padding:12px 22px;
  font-weight:700;
  font-size:.92rem;
  border:2px solid var(--c-deep);
  border-bottom:none;
  background:var(--c-snow);
  color:var(--c-deep);
  transform:skewX(-4deg);
  margin-right:8px;
}
.track-tabs [role="tab"][aria-selected="true"]{
  background:var(--c-blue);
  color:#fff;
  position:relative;
}
.track-tabs [role="tab"][aria-selected="true"]::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-4px;
  height:4px;
  background:var(--c-orange);
}
.tab-panel:focus-visible{outline:3px solid var(--c-orange)}
/* ===== 积分条 ===== */
.score-strip{
  padding:12px 0;
  border-bottom:1px solid var(--c-grayblue);
  display:grid;
  grid-template-columns:80px 1fr 70px;
  align-items:center;
  gap:16px;
  font-family:var(--font-tech);
  font-size:.88rem;
}
.score-strip__name{font-weight:600;color:var(--c-deep)}
.score-strip__bar{
  height:12px;
  background:var(--c-grayblue);
  position:relative;
  overflow:hidden;
}
.score-strip__bar span{
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:var(--bar,0%);
  background:var(--c-blue);
  transition:width .8s cubic-bezier(.2,.8,.2,1);
}
.score-strip__bar span.is-revealed{width:var(--bar)}
.score-strip__value{
  text-align:right;
  font-weight:700;
}
/* ===== 卡片系统 ===== */
.card-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:24px;
}
.card{
  background:var(--c-snow);
  border:2px solid var(--c-deep);
  padding:24px;
  box-shadow:4px 4px 0 var(--c-deep);
  transition:transform var(--dur) ease,box-shadow var(--dur) ease;
}
.card:hover{
  transform:translate(-3px,-3px);
  box-shadow:8px 8px 0 var(--c-deep);
}
.card--paper{background:var(--c-paper)}
.card--blue{background:var(--c-blue);color:var(--c-snow)}
.card--blue .card__title,.card--blue a{color:#fff}
.card__path{
  display:inline-block;
  font-family:var(--font-tech);
  font-size:.78rem;
  color:var(--c-orange);
  margin-bottom:10px;
  transform:skewX(-6deg);
}
.card__title{font-size:1.3rem;font-weight:800;margin-bottom:8px}
.card__text{font-size:.92rem;color:var(--c-muted)}
/* ===== 折叠面板 ===== */
.collapse{border:1px solid var(--c-grayblue);margin-bottom:12px}
.collapse__btn{
  width:100%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:14px 18px;
  background:var(--c-snow);
  color:var(--c-deep);
  font-weight:600;
  text-align:left;
  border-bottom:1px solid var(--c-grayblue);
}
.collapse__btn::after{
  content:"+";
  font-family:var(--font-tech);
  font-size:1.2rem;
  color:var(--c-orange);
  transition:transform .2s;
}
.collapse__btn[aria-expanded="true"]::after{transform:rotate(45deg)}
.collapse__panel{
  padding:16px 18px;
  background:var(--c-paper);
  font-size:.94rem;
}
/* 滚动显现 */
[data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .6s ease,transform .6s ease;
}
[data-reveal].is-revealed{
  opacity:1;
  transform:none;
}
/* 滚动进度条 */
[data-scope]{
  position:fixed;
  top:0;
  left:0;
  height:4px;
  width:0;
  background:var(--c-orange);
  z-index:2000;
  transform-origin:left;
  transition:width .1s linear;
}
/* 工具总览条 */
.tool-map{
  border:2px solid var(--c-deep);
  background:var(--c-paper);
  display:flex;
  flex-wrap:wrap;
  gap:28px;
  padding:28px;
}
.tool-map__item{
  flex:1 1 200px;
  position:relative;
  padding:20px 18px;
  background:var(--c-snow);
  border:1px solid var(--c-grayblue);
  box-shadow:3px 3px 0 var(--c-deep);
  transition:transform .2s;
}
.tool-map__item:hover{transform:translateY(-3px)}
.tool-map__num{
  font-family:var(--font-tech);
  font-size:1.2rem;
  color:var(--c-orange);
  display:block;
  margin-bottom:6px;
}
.tool-map__item h3{font-size:1.05rem;margin-bottom:4px}
.tool-map__item p{font-size:.84rem;color:var(--c-muted)}
/* 表格 */
.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:.92rem;
  background:var(--c-snow);
}
.data-table th{
  background:var(--c-deep);
  color:#fff;
  text-align:left;
  padding:12px 14px;
  font-weight:700;
  font-size:.88rem;
}
.data-table td{
  padding:10px 14px;
  border:1px solid var(--c-grayblue);
}
.data-table tr:nth-child(even) td{background:#fff}
/* 背景分区色块 */
.hero-band{
  background:
    linear-gradient(0deg,rgba(15,42,67,.7),rgba(15,42,67,.3)),
    repeating-linear-gradient(115deg,var(--c-blue) 0px,var(--c-blue) 18px,var(--c-deep) 18px,var(--c-deep) 22px);
  color:#fff;
}
/* ===== 响应式 ===== */
@media (max-width:1024px){
  .site-footer__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .site-header{
    width:100%;
    height:auto;
    position:fixed;
    border-right:none;
    border-bottom:3px solid var(--c-orange);
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    padding:10px 20px;
  }
  .site-header__bar{
    border-bottom:none;
    padding:0;
    flex:1;
  }
  .nav-toggle{display:block}
  .site-nav{
    position:fixed;
    top:0;
    right:0;
    height:100vh;
    width:min(320px,82vw);
    background:var(--c-deep);
    border-left:3px solid var(--c-orange);
    padding:80px 20px 20px;
    transform:translateX(100%);
    transition:transform .3s ease;
    z-index:1100;
    box-shadow:-8px 0 20px rgba(0,0,0,.2);
  }
  .site-nav[data-open]{transform:translateX(0)}
  .site-nav__main a{padding-block:14px;font-size:1.02rem}
  .nav-meta{margin-top:30px}
  .nav-cta{margin-top:20px}
  body.nav-lock{overflow:hidden}
  .tool-map{flex-direction:column}
}
@media (max-width:640px){
  :root{--container:100%}
  .container{width:calc(100% - 28px)}
  .section{padding:48px 0}
  .frame-device{margin:12px}
  .frame-device__readout{flex-direction:column;gap:8px}
  .site-footer__grid{grid-template-columns:1fr;gap:32px}
  .site-footer__inner{padding:48px 0 36px}
  .skip-link{font-size:.82rem;padding:8px 12px}
  .score-strip{
    grid-template-columns:48px 1fr 46px;
    gap:10px;
    font-size:.76rem;
  }
  .track-tabs [role="tab"]{
    flex:1 1 auto;
    padding:10px 10px;
    text-align:center;
    margin-right:0;
    transform:none;
  }
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
  }
  [data-scope]{display:none}
}
/* 桌面端主体自适应侧栏 */
@media (min-width:901px){
  body{
    padding-left:var(--header-w);
  }
  .skip-link{left:calc(var(--header-w) + 16px)}
}