/* ==========================================================================
   领航国际站 · 共享样式表 /assets/site.css
   设计语言：未来航海图 × 城市坐标 / 深海蓝基底 + 信号橙 + 荧光青
   ========================================================================== */

:root{
  --deep:#0B1E3A;
  --abyss:#06132A;
  --panel:#12294A;
  --line:#24406B;
  --orange:#FF6B35;
  --orange-soft:#FF9A6E;
  --cyan:#00E5FF;
  --cyan-soft:#7CF3FF;
  --ink:#EAF3FB;
  --ink-dim:#9FB3C8;
  --white:#FFFFFF;
  --green:#2FE6A8;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --wrap:1280px;
  --gap:20px;
  --radius:3px;
  --ease:160ms ease;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;-webkit-appearance:none;appearance:none}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
input,select{font:inherit}

/* ---------- base ---------- */
body{
  min-height:100vh;
  background-color:var(--deep);
  background-image:
    linear-gradient(rgba(36,64,107,.20) 1px,transparent 1px),
    linear-gradient(90deg,rgba(36,64,107,.20) 1px,transparent 1px);
  background-size:96px 96px,96px 96px;
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.005em;
}

h1,h2,h3,h4{color:var(--white);font-weight:900;line-height:1.16;letter-spacing:-.01em}
h1{font-size:clamp(34px,5.2vw,64px)}
h2{font-size:clamp(26px,3.2vw,40px)}
h3{font-size:clamp(20px,1.9vw,26px);font-weight:700;line-height:1.3}
h4{font-size:17px;font-weight:700}

#main-content{display:block;padding-bottom:48px}

.container{width:min(100% - 40px,var(--wrap));margin-inline:auto}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;box-shadow:0 0 0 4px rgba(0,229,255,.20);border-radius:2px}

.skip-link{
  position:absolute;left:16px;top:-72px;z-index:200;
  padding:10px 16px;border-radius:var(--radius);
  background:var(--cyan);color:#06132A;font-weight:700;font-size:15px;
  transition:top var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 通用文字元件 ---------- */
.lead{font-size:19px;line-height:1.85;color:var(--ink-dim);max-width:64ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  color:var(--orange);text-transform:uppercase;
}
.coord-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--cyan)}
.data-mono{font-family:var(--font-mono);font-size:.88em;letter-spacing:.04em;color:var(--cyan-soft)}
.side-note{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  color:var(--ink-dim);
}

/* ---------- 章节头与刻度 ---------- */
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);align-items:end;gap:16px;
  padding-bottom:14px;margin-bottom:28px;border-bottom:1px solid var(--line);
}
.section-num{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;color:var(--orange);
  padding-bottom:6px;
}
.section-head h2{font-size:clamp(24px,2.8vw,36px)}
.rule-scale{
  height:6px;margin:28px 0;
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 14px);
  background-size:auto 6px;background-repeat:repeat-x;
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:var(--gap)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

.index-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;
}
.index-grid > *{
  background:var(--panel);padding:18px 18px 20px;min-height:100%;
}

/* ---------- 卡片 / 标签 / 状态 ---------- */
.card{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  transition:border-color var(--ease),background-color var(--ease);
}
.card::after{
  content:attr(data-coord);
  position:absolute;top:9px;right:11px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--ink-dim);opacity:0;
  transition:opacity var(--ease),color var(--ease);
}
.card:hover{border-color:var(--cyan)}
.card:hover::after{opacity:1;color:var(--cyan)}

.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--line);border-radius:2px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--ink-dim);
  transition:background-color var(--ease),border-color var(--ease),color var(--ease);
}
.tag:hover{border-color:var(--cyan);color:var(--cyan)}
.tag.is-active,.tag[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#06132A}

.batch{
  display:inline-flex;align-items:center;gap:7px;
  padding:4px 10px;border:1px solid rgba(255,107,53,.55);border-radius:2px;
  background:rgba(255,107,53,.09);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--orange-soft);
}

.status{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;color:var(--green);
}
.status::before{
  content:"";width:7px;height:7px;border-radius:50%;background:var(--green);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.78)}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);color:var(--ink);
  font-weight:700;font-size:15px;letter-spacing:.03em;
  transition:border-color var(--ease),color var(--ease),background-color var(--ease),transform 120ms ease;
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--orange);border-color:var(--orange);color:#06132A}
.btn-primary:hover{background:var(--orange-soft);border-color:var(--orange-soft);color:#06132A}
.btn-cyan{background:transparent;border-color:var(--cyan);color:var(--cyan)}
.btn-cyan:hover{background:rgba(0,229,255,.12);color:var(--cyan-soft)}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin:22px 0 0;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--ink-dim)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.breadcrumb-item{display:flex;align-items:center;gap:10px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--line)}
.breadcrumb-link{color:var(--ink-dim);transition:color var(--ease)}
.breadcrumb-link:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- 长文 ---------- */
.prose{max-width:70ch;font-size:17px;line-height:1.85;color:var(--ink)}
.prose > * + *{margin-top:1.05em}
.prose h2{margin-top:1.9em}
.prose h3{margin-top:1.6em}
.prose ul li{position:relative;padding-left:22px}
.prose ul li + li{margin-top:.5em}
.prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:11px;height:1px;background:var(--cyan)}
.prose a{color:var(--cyan-soft);border-bottom:2px solid rgba(0,229,255,.32);transition:color var(--ease),border-color var(--ease)}
.prose a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* ---------- 图形容器 ---------- */
.media-frame{
  position:relative;display:block;width:100%;aspect-ratio:16/10;
  background:var(--abyss);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame img,.media-frame svg{width:100%;height:100%;object-fit:cover}
.media-caption{
  margin-top:8px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.05em;color:var(--ink-dim);
}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--deep);
  border-bottom:1px solid var(--line);
}
.site-header::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--orange),var(--cyan) 42%,transparent 78%);
}
.header-inner{
  width:min(100% - 40px,var(--wrap));margin-inline:auto;
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;gap:24px;padding:14px 0;
}

.brand-cluster{display:flex;align-items:center;gap:18px;min-width:0}
.brand-lockup{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark,.footer-mark{position:relative;display:block;flex:none;border:1px solid var(--line);border-radius:50%}
.brand-mark{width:36px;height:36px}
.brand-mark::before,.footer-mark::before{
  content:"";position:absolute;inset:6px;border:1px solid var(--cyan);transform:rotate(45deg);
}
.brand-mark::after,.footer-mark::after{
  content:"";position:absolute;left:50%;top:50%;width:5px;height:5px;margin:-2.5px 0 0 -2.5px;
  background:var(--orange);border-radius:50%;
}
.brand-text{display:block;min-width:0}
.brand-name{display:block;font-size:19px;font-weight:900;color:var(--white);letter-spacing:.06em;line-height:1.2}
.brand-subline{
  display:block;margin-top:3px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.16em;color:var(--ink-dim);white-space:nowrap;
}
.brand-lockup:hover .brand-name{color:var(--cyan)}

.cta-direct{
  display:inline-flex;align-items:center;gap:9px;flex:none;
  padding:10px 16px;border:1px solid var(--orange);border-radius:var(--radius);
  background:var(--orange);color:#06132A;
  font-weight:900;font-size:14px;letter-spacing:.06em;white-space:nowrap;
  transition:background-color var(--ease),border-color var(--ease),box-shadow var(--ease),transform 120ms ease;
}
.cta-direct::after{content:"→";font-family:var(--font-mono);font-size:15px;line-height:1}
.cta-direct:hover{background:var(--orange-soft);border-color:var(--orange-soft);box-shadow:0 0 0 3px rgba(255,107,53,.18)}
.cta-direct:active{transform:scale(.98)}

.header-grid{
  height:22px;
  border-top:1px solid rgba(36,64,107,.75);
  border-bottom:1px solid rgba(36,64,107,.75);
  background-image:
    repeating-linear-gradient(90deg,rgba(36,64,107,.9) 0 1px,transparent 1px 44px),
    linear-gradient(90deg,transparent,rgba(0,229,255,.32),transparent);
  background-size:auto 100%,100% 1px;
  background-position:0 0,0 50%;
  background-repeat:repeat,no-repeat;
}

.header-end{display:flex;flex-direction:column;align-items:flex-end;gap:7px}
.header-nav{display:block}
.nav-list{display:flex;align-items:center;justify-content:flex-end;gap:4px}
.nav-link{
  position:relative;display:inline-block;padding:8px 11px;
  font-size:15px;font-weight:700;letter-spacing:.02em;color:var(--ink);
  transition:color var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:11px;right:11px;bottom:2px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform var(--ease),background-color var(--ease);
}
.nav-link:hover{color:var(--cyan)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.header-meta{display:flex;align-items:center;gap:14px}
.header-aux{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;
  color:var(--ink-dim);white-space:nowrap;
}
.aux-link{color:var(--cyan-soft);border-bottom:1px solid transparent;transition:color var(--ease),border-color var(--ease)}
.aux-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 12px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);color:var(--ink);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  transition:border-color var(--ease),color var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle-bars .bar{display:block;height:2px;background:currentColor;transition:transform var(--ease),opacity var(--ease)}
.nav-toggle-bars .bar:nth-child(2){width:70%}
.nav-toggle[aria-expanded="true"] .bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:transparent}
.scroll-progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--orange),var(--cyan));
  transition:width 100ms linear;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:88px;padding:56px 0 28px;
  background:var(--abyss);border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:6px;
  background-image:
    repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 16px),
    linear-gradient(90deg,var(--orange),transparent 58%);
  background-size:auto 6px,100% 2px;
  background-position:0 0,0 0;
  background-repeat:repeat-x,no-repeat;
}
.footer-inner{
  width:min(100% - 40px,var(--wrap));margin-inline:auto;
  display:grid;grid-template-columns:1.35fr 1fr 1.25fr 1.15fr;gap:34px;
}
.footer-brand{min-width:0}
.footer-mark{width:44px;height:44px;margin-bottom:16px}
.footer-mark::before{inset:8px}
.footer-name{font-size:18px;font-weight:900;color:var(--white);letter-spacing:.06em}
.footer-slogan{
  margin-top:6px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.06em;color:var(--ink-dim);
}
.footer-batch{margin-top:14px}
.batch{max-width:100%}

.footer-col-title{
  display:flex;align-items:center;gap:9px;
  margin-bottom:14px;font-family:var(--font-mono);font-size:12px;
  font-weight:400;letter-spacing:.18em;color:var(--cyan);
}
.footer-col-title::before{content:"";width:16px;height:1px;background:var(--cyan);flex:none}
.footer-links li{margin-bottom:9px;font-size:14px;line-height:1.7;color:var(--ink-dim)}
.footer-contact li{word-break:break-word}
.footer-link{
  color:var(--ink);font-size:14px;
  border-bottom:1px solid transparent;
  transition:color var(--ease),border-color var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-note{font-size:13.5px;line-height:1.75;color:var(--ink-dim)}
.footer-note + .footer-note{margin-top:10px}

.footer-bottom{
  width:min(100% - 40px,var(--wrap));margin:40px auto 0;padding-top:18px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--ink-dim);
}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.footer-meta{color:var(--ink-dim)}
.footer-legal .footer-link{font-family:var(--font-mono);font-size:12px;color:var(--ink-dim)}
.footer-legal .footer-link:hover{color:var(--cyan)}
.footer-copy{color:var(--ink-dim)}

/* ---------- 进入视口显现 ---------- */
html.js [data-reveal]{
  opacity:0;transform:translateY(4px);
  transition:opacity 420ms ease,transform 420ms ease;
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .header-inner{grid-template-columns:minmax(0,1fr) auto;gap:12px}
  .header-grid{display:none}
  .header-end{flex-direction:row;align-items:center;justify-content:flex-end;gap:12px}
  .nav-toggle{display:inline-flex}
  .header-nav{
    position:absolute;left:0;right:0;top:100%;display:none;
    background:var(--abyss);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    padding:6px 0 14px;max-height:72vh;overflow-y:auto;
    box-shadow:0 20px 34px rgba(6,19,42,.6);
  }
  .header-nav[data-open]{display:block;animation:navDrop 180ms ease-out both}
  .nav-list{
    flex-direction:column;align-items:stretch;gap:0;
    width:min(100% - 40px,var(--wrap));margin-inline:auto;
  }
  .nav-item{border-bottom:1px solid rgba(36,64,107,.55)}
  .nav-item:last-child{border-bottom:0}
  .nav-link{display:block;padding:14px 2px;font-size:16px}
  .nav-link::after{left:2px;right:auto;width:26px;bottom:9px}

  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

@media (max-width:640px){
  body{font-size:16px;background-size:64px 64px,64px 64px}
  .container,.header-inner,.footer-inner,.footer-bottom,.nav-list{width:min(100% - 28px,var(--wrap))}
  .header-inner{padding:11px 0}
  .brand-cluster{gap:12px}
  .brand-subline{display:none}
  .brand-name{font-size:17px}
  .cta-direct{padding:9px 12px;font-size:13px}
  .aux-time{display:none}
  .header-aux{font-size:11px}
  .site-footer{margin-top:60px;padding:42px 0 22px}
  .footer-inner{grid-template-columns:minmax(0,1fr);gap:26px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .index-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
  .section-head{grid-template-columns:minmax(0,1fr);align-items:start;gap:6px}
  .section-num{padding-bottom:0}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .status::before{animation:none}
  html.js [data-reveal]{opacity:1;transform:none}
  .header-nav[data-open]{animation:none}
}