:root{
  --color-bg:#0B2B1F;
  --color-bg-panel:#123D2D;
  --color-bg-dark:#071E16;
  --color-line:#1E4B3B;
  --color-accent:#F5C518;
  --color-accent-orange:#FF7A1A;
  --color-white:#F2F8F4;
  --color-text-sub:#A8C3B5;
  --color-text-mute:#6F8F80;
  --color-success:#2AB673;
  --font-headline:'Inter','PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'PingFang SC','Microsoft YaHei',sans-serif;
  --font-data:'Roboto Mono','SFMono','Cascadia Code',monospace;
  --header-w:280px;
  --space-section:80px;
  --space-block:24px;
  --radius-cut:8px;
  --ease:150ms cubic-bezier(.2,.7,.3,1);
  --shadow-card:0 4px 0 rgba(0,0,0,.25);
  --topbar-h:56px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

html{
  scroll-behavior:smooth;
  background:var(--color-bg);
}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--color-white);
  background:var(--color-bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{max-width:100%;display:block}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
:focus-visible{outline:2px solid var(--color-accent);outline-offset:3px;border-radius:2px}
::selection{background:var(--color-accent);color:#0B2B1F}

#main-content{
  min-height:60vh;
}

.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:3000;
  background:var(--color-accent);
  color:#0B2B1F;
  font-weight:700;
  font-size:14px;
  padding:10px 20px;
  border-radius:4px;
  transform:translateY(-200%);
  transition:transform var(--ease);
}
.skip-link:focus{
  transform:translateY(0);
}

/* ========== 头部框架 ========== */
.site-header{
  position:relative;
  z-index:1000;
  background:var(--color-bg-dark);
  border-bottom:1px solid var(--color-line);
}

.header-grid{
  display:grid;
  grid-template-columns:1fr auto;
  align-items:center;
  height:var(--topbar-h);
  padding:0 24px 0 0;
  border-bottom:1px solid var(--color-line);
  background:var(--color-bg-dark);
}

.header-brand-col{
  height:100%;
  display:flex;
  align-items:center;
}

.brand-lockup{
  display:inline-flex;
  align-items:center;
  gap:12px;
  height:100%;
  padding:0 24px;
  border-right:1px solid var(--color-line);
  transition:background var(--ease);
}
.brand-lockup:hover{
  background:rgba(30,75,59,.2);
}

.brand-mark{
  position:relative;
  width:28px;
  height:28px;
  display:block;
  flex-shrink:0;
  border:1px solid var(--color-accent);
  transform:rotate(45deg);
  overflow:hidden;
}
.brand-mark-line{
  position:absolute;
  left:0;
  right:0;
  height:1px;
  background:var(--color-accent);
}
.brand-mark-line:nth-child(1){top:8px}
.brand-mark-line:nth-child(2){top:14px}
.brand-mark-line:nth-child(3){top:20px}
.brand-mark-dot{
  position:absolute;
  top:12px;
  left:12px;
  width:4px;
  height:4px;
  background:var(--color-accent-orange);
  border-radius:50%;
  animation:pulse-dot 2s infinite;
}

@keyframes pulse-dot{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.5;transform:scale(1.4)}
}

.brand-word{
  display:flex;
  flex-direction:column;
  line-height:1.2;
}
.brand-name{
  font-family:var(--font-headline);
  font-weight:800;
  font-size:18px;
  letter-spacing:-0.02em;
  color:var(--color-white);
}
.brand-code{
  font-family:var(--font-data);
  font-size:10px;
  letter-spacing:.08em;
  color:var(--color-text-mute);
}

.header-status{
  display:flex;
  align-items:center;
  gap:8px;
  height:100%;
  padding:0 24px;
  border-left:1px solid var(--color-line);
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--color-text-sub);
  background:rgba(18,61,45,.3);
}
.status-dot{
  width:8px;
  height:8px;
  background:var(--color-success);
  border-radius:50%;
  animation:blink 1.6s ease-in-out infinite;
}
@keyframes blink{
  0%,100%{opacity:1}
  50%{opacity:.4}
}
.status-code{
  margin-left:8px;
  padding:2px 6px;
  border:1px solid var(--color-line);
  color:var(--color-text-mute);
  font-size:10px;
}

.nav-toggle{
  display:none;
}

/* ========== 主导航（桌面左侧框架） ========== */
.main-nav{
  position:fixed;
  top:0;
  left:0;
  width:var(--header-w);
  height:100vh;
  background:var(--color-bg-panel);
  border-right:1px solid var(--color-line);
  padding:calc(var(--topbar-h) + 32px) 24px 32px;
  display:flex;
  flex-direction:column;
  z-index:900;
  overflow-y:auto;
}

.nav-index{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-bottom:16px;
  margin-bottom:24px;
  border-bottom:1px solid var(--color-line);
  font-family:var(--font-data);
  font-size:10px;
  color:var(--color-text-mute);
  letter-spacing:.1em;
}
.nav-index-code{
  color:var(--color-accent);
}

.nav-list{
  display:flex;
  flex-direction:column;
  gap:2px;
}

.nav-item{
  position:relative;
}

.nav-link{
  display:flex;
  align-items:center;
  padding:10px 12px;
  font-family:var(--font-headline);
  font-weight:700;
  font-size:15px;
  letter-spacing:-0.01em;
  color:var(--color-text-sub);
  border-left:2px solid transparent;
  transition:all var(--ease);
}
.nav-link:hover{
  color:var(--color-white);
  background:rgba(30,75,59,.3);
  border-left-color:var(--color-accent);
  padding-left:16px;
}
.nav-link[aria-current="page"]{
  color:var(--color-accent);
  border-left-color:var(--color-accent);
  background:rgba(245,197,24,.06);
}

.nav-meta{
  margin-top:auto;
  padding-top:24px;
  border-top:1px solid var(--color-line);
  font-family:var(--font-data);
  font-size:10px;
  line-height:1.8;
  letter-spacing:.05em;
  color:var(--color-text-mute);
}

.nav-contact{
  margin-top:12px;
  font-size:11px;
  color:var(--color-text-sub);
  line-height:1.8;
}
.nav-contact-item{
  display:block;
}

/* 内容区域需要为左边距留出空间，页面Shell处理 */
.page-shell{
  margin-left:var(--header-w);
  position:relative;
  background:var(--color-bg);
  min-height:80vh;
}
.page-shell::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:1px;
  height:100%;
  background:var(--color-line);
  opacity:.5;
  pointer-events:none;
}

.section{
  padding:var(--space-section) 48px;
  max-width:1200px;
}
.container-narrow{
  max-width:680px;
  margin:0 auto;
}

/* ========== 头部移动端 ========== */
@media (max-width:860px){
  :root{
    --header-w:0px;
  }
  .site-header{
    position:sticky;
    top:0;
  }
  .header-grid{
    grid-template-columns:1fr auto auto;
  }
  .header-status{
    display:none;
  }
  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:8px 16px;
    border:1px solid var(--color-line);
    border-radius:4px;
    background:var(--color-bg-panel);
    color:var(--color-white);
    font-size:13px;
    font-weight:600;
    transition:all var(--ease);
  }
  .nav-toggle:hover{
    border-color:var(--color-accent);
    color:var(--color-accent);
  }
  .nav-toggle-box{
    position:relative;
    width:18px;
    height:14px;
    display:block;
  }
  .nav-toggle-inner,
  .nav-toggle-inner::before,
  .nav-toggle-inner::after{
    content:"";
    position:absolute;
    left:0;
    right:0;
    height:2px;
    background:currentColor;
    transition:all var(--ease);
  }
  .nav-toggle-inner{
    top:6px;
  }
  .nav-toggle-inner::before{
    top:-5px;
  }
  .nav-toggle-inner::after{
    top:5px;
  }
  .nav-toggle[data-open] .nav-toggle-inner{
    background:transparent;
  }
  .nav-toggle[data-open] .nav-toggle-inner::before{
    top:0;
    transform:rotate(45deg);
  }
  .nav-toggle[data-open] .nav-toggle-inner::after{
    top:0;
    transform:rotate(-45deg);
  }

  .main-nav{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    width:min(84vw,340px);
    height:100vh;
    padding:80px 20px 32px;
    transform:translateX(-105%);
    visibility:hidden;
    transition:transform var(--ease),visibility var(--ease);
    box-shadow:0 0 60px rgba(0,0,0,.5);
  }
  .main-nav[data-open]{
    transform:translateX(0);
    visibility:visible;
  }
  .nav-toggle-label{
    display:none;
  }
  .page-shell{
    margin-left:0;
  }
  .section{
    padding:48px 20px;
  }
}

@media (max-width:480px){
  .header-grid{
    padding:0 12px 0 0;
  }
  .brand-lockup{
    padding:0 12px;
    gap:8px;
  }
  .brand-mark{
    width:24px;
    height:24px;
  }
  .brand-name{
    font-size:15px;
  }
  .brand-code{
    font-size:8px;
  }
}

/* ========== footer ========== */
.site-footer{
  background:var(--color-bg-dark);
  border-top:2px solid var(--color-line);
  position:relative;
  margin-left:var(--header-w);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-2px;
  left:0;
  width:120px;
  height:2px;
  background:var(--color-accent);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:40px;
  padding:52px 48px 44px;
  max-width:1320px;
}
.footer-brand-col{
  display:flex;
  flex-direction:column;
  gap:16px;
}
.brand-lockup--footer{
  padding:0;
  border-right:none;
  height:auto;
}
.brand-lockup--footer .brand-mark{
  width:24px;
  height:24px;
}
.brand-lockup--footer .brand-mark-line:nth-child(1){top:7px}
.brand-lockup--footer .brand-mark-line:nth-child(2){top:11px}
.brand-lockup--footer .brand-mark-line:nth-child(3){top:15px}
.brand-lockup--footer .brand-mark-dot{top:9px;left:10px}

.footer-about{
  font-size:13px;
  letter-spacing:.02em;
  color:var(--color-text-sub);
  max-width:280px;
}
.footer-heading{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-headline);
  font-size:14px;
  font-weight:700;
  color:var(--color-white);
  padding-bottom:10px;
  margin-bottom:16px;
  border-bottom:1px solid var(--color-line);
  letter-spacing:.02em;
}
.footer-heading-index{
  font-family:var(--font-data);
  font-size:10px;
  color:var(--color-accent);
}
.footer-nav-list{
  display:flex;
  flex-direction:column;
  gap:6px;
}
.footer-link{
  font-size:13px;
  color:var(--color-text-sub);
  padding-left:10px;
  border-left:1px solid transparent;
  transition:all var(--ease);
}
.footer-link:hover{
  color:var(--color-white);
  border-left-color:var(--color-accent);
  padding-left:14px;
}
.footer-contact-list{
  margin-top:16px;
  padding-top:16px;
  border-top:1px solid var(--color-line);
  font-size:11px;
  font-family:var(--font-data);
  color:var(--color-text-mute);
  line-height:2;
  letter-spacing:.02em;
}
.footer-time-col{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  padding-left:20px;
  border-left:1px solid var(--color-line);
}
.footer-time-label{
  font-family:var(--font-data);
  font-size:10px;
  letter-spacing:.15em;
  color:var(--color-text-mute);
  text-transform:uppercase;
}
.footer-time-value{
  font-family:var(--font-headline);
  font-weight:800;
  font-size:36px;
  letter-spacing:-0.02em;
  color:var(--color-accent);
  line-height:1.1;
  margin:8px 0 4px;
}
.footer-time-sub{
  font-size:12px;
  color:var(--color-text-sub);
}
.footer-daily{
  margin-top:24px;
  padding-top:12px;
  border-top:1px solid var(--color-line);
  font-size:11px;
  font-family:var(--font-data);
  color:var(--color-text-mute);
  width:100%;
  letter-spacing:.03em;
}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  border-top:1px solid var(--color-line);
  padding:18px 48px;
  flex-wrap:wrap;
  background:rgba(0,0,0,.15);
}
.footer-bottom-left{
  font-size:11px;
  color:var(--color-text-mute);
  letter-spacing:.02em;
  max-width:560px;
}
.footer-bottom-right{
  font-size:11px;
  font-family:var(--font-data);
  color:var(--color-text-mute);
  white-space:nowrap;
}

@media (max-width:1024px){
  .footer-grid{
    grid-template-columns:1fr 1fr;
  }
  .footer-time-col{
    border-left:none;
    padding-left:0;
  }
}

@media (max-width:860px){
  .site-footer{
    margin-left:0;
  }
  .footer-grid{
    padding:40px 20px;
    gap:28px;
  }
  .footer-bottom{
    padding:14px 20px;
    align-items:flex-start;
  }
}

@media (max-width:560px){
  .footer-grid{
    grid-template-columns:1fr;
  }
}

/* ========== 通用按钮与数据组件 ========== */
.chamfer-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 24px;
  font-family:var(--font-headline);
  font-weight:700;
  font-size:14px;
  letter-spacing:.02em;
  background:var(--color-bg-panel);
  color:var(--color-white);
  border:1px solid var(--color-line);
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px));
  transition:all var(--ease);
  cursor:pointer;
}
.chamfer-btn:hover{
  background:var(--color-line);
  transform:translateY(-2px);
}
.chamfer-btn--primary{
  background:var(--color-accent);
  color:#0B2B1F;
  border-color:var(--color-accent);
  font-weight:800;
}
.chamfer-btn--primary:hover{
  background:#ffe14d;
  border-color:#ffe14d;
}
.chamfer-btn--accent{
  background:var(--color-accent-orange);
  color:#0B2B1F;
  border-color:var(--color-accent-orange);
  font-weight:800;
}
.chamfer-btn--accent:hover{
  background:#ff9440;
  border-color:#ff9440;
}
.chamfer-btn:focus-visible{
  outline:2px solid var(--color-white);
  outline-offset:2px;
}

.data-badge{
  display:inline-flex;
  align-items:center;
  gap:4px;
  padding:3px 8px;
  font-family:var(--font-data);
  font-size:12px;
  font-weight:600;
  background:rgba(18,61,45,.6);
  border:1px solid var(--color-line);
  border-radius:2px;
  color:var(--color-text-sub);
}
.data-badge--accent{
  color:var(--color-accent);
  border-color:rgba(245,197,24,.4);
}

.card-panel{
  position:relative;
  background:var(--color-bg-panel);
  border:1px solid var(--color-line);
  clip-path:polygon(0 0,calc(100% - 14px) 0,100% 14px,100% 100%,14px 100%,0 calc(100% - 14px));
  padding:24px;
  transition:transform var(--ease),box-shadow var(--ease);
}
.card-panel:hover{
  transform:translateY(-2px);
  box-shadow:var(--shadow-card);
}
.card-index{
  position:absolute;
  top:14px;
  right:16px;
  font-family:var(--font-data);
  font-size:11px;
  color:var(--color-text-mute);
  letter-spacing:.05em;
}

.tag-index{
  display:inline-block;
  padding:2px 8px;
  font-family:var(--font-data);
  font-size:10px;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--color-accent);
  border:1px solid rgba(245,197,24,.4);
  background:rgba(245,197,24,.05);
  text-transform:uppercase;
}

.crumb{
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
  font-size:13px;
  color:var(--color-text-mute);
  padding:16px 0 0;
}
.crumb a{
  color:var(--color-text-sub);
  transition:color var(--ease);
}
.crumb a:hover{
  color:var(--color-accent);
}
.crumb-sep{
  color:var(--color-line);
}

.img-frame{
  position:relative;
  overflow:hidden;
  background:var(--color-bg-panel);
  border:1px solid var(--color-line);
  aspect-ratio:16/9;
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,16px 100%,0 calc(100% - 16px));
}
.img-frame::after{
  content:attr(data-label);
  position:absolute;
  bottom:10px;
  left:12px;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--color-text-mute);
  background:rgba(7,30,22,.75);
  padding:4px 10px;
  border:1px solid var(--color-line);
  z-index:2;
}

/* ========== 滚动进度条 ========== */
.scroll-progress{
  position:fixed;
  top:0;
  right:0;
  height:3px;
  width:0%;
  z-index:2000;
  background:var(--color-accent);
  pointer-events:none;
  transition:width 80ms linear;
}

/* ========== 返回顶部 ========== */
.back-to-top{
  position:fixed;
  right:28px;
  bottom:28px;
  z-index:1500;
  width:44px;
  height:44px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--color-bg-panel);
  border:1px solid var(--color-line);
  color:var(--color-text-sub);
  font-family:var(--font-data);
  font-size:18px;
  clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,8px 100%,0 calc(100% - 8px));
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:all var(--ease);
}
.back-to-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.back-to-top:hover{
  background:var(--color-accent);
  color:#0B2B1F;
  border-color:var(--color-accent);
}

/* ========== 滚动显现 ========== */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 400ms ease,transform 400ms ease;
}
[data-reveal].is-revealed{
  opacity:1;
  transform:translateY(0);
}

/* ========== 页面垂直间距 ========== */
.page-title-block{
  position:relative;
  padding:56px 0 24px;
  border-bottom:1px solid var(--color-line);
  margin-bottom:40px;
}
.page-title-block::before{
  content:"";
  position:absolute;
  bottom:-1px;
  left:0;
  width:80px;
  height:2px;
  background:var(--color-accent);
}

h1,h2,h3,h4{
  font-family:var(--font-headline);
  color:var(--color-white);
  line-height:1.25;
  letter-spacing:-0.02em;
}
h1{
  font-size:clamp(28px,4vw,44px);
  font-weight:800;
}
h2{
  font-size:clamp(22px,3vw,32px);
  font-weight:700;
}
h3{
  font-size:18px;
  font-weight:700;
}
h4{
  font-size:15px;
  font-weight:700;
}

.body-text{
  font-size:15px;
  line-height:1.8;
  color:var(--color-text-sub);
}
.body-text strong{
  color:var(--color-white);
  font-weight:600;
}

/* ========== 表格基础 ========== */
.data-table{
  width:100%;
  border-collapse:collapse;
  font-family:var(--font-data);
  font-size:13px;
}
.data-table th{
  text-align:left;
  padding:10px 12px;
  border-bottom:2px solid var(--color-line);
  color:var(--color-text-mute);
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  font-size:11px;
}
.data-table td{
  padding:10px 12px;
  border-bottom:1px solid rgba(30,75,59,.5);
  color:var(--color-text-sub);
  font-variant-numeric:tabular-nums;
}
.data-table tr:hover td{
  background:rgba(18,61,45,.5);
  color:var(--color-white);
}

/* ========== 焦点和减少动画 ========== */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html{
    scroll-behavior:auto;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
  }
}