/* =========================================================
   site.css — 夜间数字港口 共享外壳
   ========================================================= */

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

:root{
  --c-ink:#061826;
  --c-ink-2:#0B2239;
  --c-panel:#10283B;
  --c-cyan:#35E0D0;
  --c-coral:#FF7A59;
  --c-sand:#E8C48A;
  --c-mist:#EAF4F8;
  --c-slate:#A9C0CC;
  --c-teal:#1B7F82;
  --c-line:#5A7D93;

  --font-sans:"Inter Tight","PingFang SC","Noto Sans SC",system-ui,sans-serif;
  --font-serif:"Source Han Serif SC","Songti SC",serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,monospace;

  --wrap:1200px;
  --wrap-wide:1320px;
  --gutter:clamp(20px,4vw,48px);
  --cut:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html,body{ min-height:100%; }

body{
  background-color:var(--c-ink);
  background-image:
    radial-gradient(1100px 620px at 84% -12%, rgba(53,224,208,.09), transparent 68%),
    radial-gradient(880px 520px at 4% 6%, rgba(255,122,89,.07), transparent 66%);
  background-repeat:no-repeat;
  color:var(--c-mist);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.004em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{
  font-family:var(--font-sans);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.08;
  color:var(--c-mist);
  text-wrap:balance;
}

::selection{ background:rgba(53,224,208,.32); color:var(--c-mist); }

:focus-visible{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
}

#main-content{ scroll-margin-top:104px; }

/* ---------- 布局基元 ---------- */

.shell{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{
  position:relative;
  padding-block:clamp(56px,8vw,104px);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--c-sand);
}
.eyebrow::before{
  content:"";
  width:20px;
  height:1px;
  background:currentColor;
  opacity:.75;
}

.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.8;
  color:#C9DCE6;
}
.prose > * + *{ margin-top:1.05em; }
.prose h2,.prose h3{ margin-top:1.8em; color:var(--c-mist); }
.prose a{
  color:var(--c-cyan);
  border-bottom:1px solid rgba(53,224,208,.42);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.prose a:hover{ border-bottom-color:var(--c-cyan); }

/* ---------- 形状 ---------- */

.cut{
  clip-path:polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.panel{
  background:var(--c-panel);
  border:1px solid rgba(90,125,147,.22);
}
.panel--hover{
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease),transform .3s var(--ease);
}
.panel--hover:hover{
  border-color:rgba(53,224,208,.48);
  box-shadow:0 26px 52px -30px rgba(53,224,208,.55);
  transform:translateY(-3px);
}

/* ---------- 图片容器基础件 ---------- */

.media{
  --media-ratio:16 / 9;
  position:relative;
  display:block;
  aspect-ratio:var(--media-ratio);
  overflow:hidden;
  background:
    linear-gradient(135deg, rgba(53,224,208,.14), rgba(255,122,89,.09) 62%, rgba(16,40,59,.9)),
    var(--c-panel);
  clip-path:polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
}
.media > img,
.media > picture,
.media > video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg, rgba(6,24,38,0) 45%, rgba(6,24,38,.62) 100%);
  pointer-events:none;
}
.media--wide{ --media-ratio:21 / 9; }
.media--tall{ --media-ratio:3 / 4; }
.media--square{ --media-ratio:1 / 1; }

.media__caption{
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--c-slate);
}

/* ---------- 按钮 ---------- */

.btn{
  --btn-bg:var(--c-cyan);
  --btn-fg:var(--c-ink);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.01em;
  line-height:1.2;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:1px solid transparent;
  border-radius:999px;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background-color .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.btn:hover{ transform:translateY(-2px); }
.btn:active{ transform:translateY(0); }

.btn--coral{
  --btn-bg:var(--c-coral);
  --btn-fg:var(--c-ink);
}
.btn--coral:hover{ box-shadow:0 16px 32px -16px rgba(255,122,89,.85); }

.btn--cyan{
  --btn-bg:var(--c-cyan);
  --btn-fg:var(--c-ink);
}
.btn--cyan:hover{ box-shadow:0 16px 32px -16px rgba(53,224,208,.8); }

.btn--ghost{
  --btn-bg:transparent;
  --btn-fg:var(--c-mist);
  border-color:rgba(169,192,204,.34);
}
.btn--ghost:hover{
  border-color:var(--c-cyan);
  color:var(--c-cyan);
  box-shadow:0 14px 30px -20px rgba(53,224,208,.7);
}

.btn--cut{
  border-radius:0;
  clip-path:polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

/* ---------- 标签 ---------- */

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--c-cyan);
  background:rgba(27,127,130,.22);
  border:1px solid rgba(53,224,208,.3);
  border-radius:999px;
}
.tag--sand{
  color:var(--c-sand);
  background:rgba(232,196,138,.12);
  border-color:rgba(232,196,138,.34);
}
.tag--coral{
  color:var(--c-coral);
  background:rgba(255,122,89,.12);
  border-color:rgba(255,122,89,.34);
}

/* ---------- 面包屑 ---------- */

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--c-slate);
}
.crumbs__link{
  color:var(--c-slate);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.crumbs__link:hover{ color:var(--c-cyan); border-bottom-color:currentColor; }
.crumbs__sep{ color:var(--c-line); }
.crumbs [aria-current="page"]{ color:var(--c-sand); }

/* ---------- 跳转链接 ---------- */

.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:10px 18px;
  font-size:14px;
  font-weight:600;
  color:var(--c-ink);
  background:var(--c-cyan);
  border-radius:8px;
  transform:translateY(-180%);
  transition:transform .25s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{ transform:translateY(0); }

/* =========================================================
   头部：双岛悬浮胶囊
   ========================================================= */

.site-header{
  position:sticky;
  top:0;
  z-index:90;
  padding-top:14px;
  background:linear-gradient(180deg, rgba(6,24,38,.97) 0%, rgba(6,24,38,.86) 62%, rgba(6,24,38,.55) 100%);
  transition:padding-top .35s var(--ease),background-color .35s var(--ease);
}
.site-header[data-condensed]{
  padding-top:6px;
  background:linear-gradient(180deg, rgba(6,24,38,.99) 0%, rgba(6,24,38,.94) 100%);
}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  width:100%;
  max-width:var(--wrap-wide);
  margin-inline:auto;
  padding:0 var(--gutter) 14px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:1 1 auto;
  min-width:0;
  color:var(--c-mist);
}
.brand-mark{
  flex:0 0 auto;
  width:22px;
  height:22px;
  background:linear-gradient(140deg,var(--c-cyan),var(--c-coral));
  clip-path:polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}
.brand-text{
  font-size:16px;
  font-weight:800;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.brand-ver{
  flex:0 0 auto;
  padding-left:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--c-sand);
  border-left:1px solid rgba(90,125,147,.5);
  white-space:nowrap;
}

.nav-dock{
  position:relative;
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:2px;
  padding:6px;
  background:rgba(16,40,59,.86);
  border:1px solid rgba(169,192,204,.18);
  border-radius:999px;
  box-shadow:0 20px 44px -28px rgba(0,0,0,.95);
}

.nav-dock__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:9px 14px;
  font-size:14px;
  font-weight:500;
  line-height:1.2;
  color:var(--c-slate);
  white-space:nowrap;
  border-radius:999px;
  transition:color .25s var(--ease),background-color .25s var(--ease);
}
.nav-dock__link:hover{
  color:var(--c-mist);
  background:rgba(53,224,208,.12);
}
.nav-dock__link[aria-current="page"]{
  color:var(--c-ink);
  background:var(--c-cyan);
  font-weight:700;
}

.nav-dock__link--pin::before{
  content:"";
  width:6px;
  height:6px;
  margin-right:7px;
  border-radius:50%;
  background:var(--c-coral);
  flex:0 0 auto;
}
.nav-dock__link--pin[aria-current="page"]::before{ background:var(--c-ink); }

.nav-dock__cta{ display:none; }

.header-actions{
  flex:1 1 auto;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:10px;
}

.header-cta{
  padding:10px 18px;
  font-size:13px;
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:42px;
  height:42px;
  flex:0 0 auto;
  color:var(--c-mist);
  background:rgba(16,40,59,.9);
  border:1px solid rgba(169,192,204,.3);
  border-radius:12px;
  transition:border-color .25s var(--ease),color .25s var(--ease);
}
.nav-toggle:hover{ border-color:var(--c-cyan); color:var(--c-cyan); }
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  border-radius:2px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:currentColor;
  border-radius:2px;
  transition:transform .3s var(--ease),top .3s var(--ease),opacity .2s linear;
}
.nav-toggle__bars::before{ top:-5px; }
.nav-toggle__bars::after{ top:5px; }
.nav-toggle.is-open .nav-toggle__bars{ background:transparent; }
.nav-toggle.is-open .nav-toggle__bars::before{ top:0; transform:rotate(45deg); }
.nav-toggle.is-open .nav-toggle__bars::after{ top:0; transform:rotate(-45deg); }

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-coral));
  transform:scaleX(0);
  transform-origin:0 50%;
  opacity:.9;
  pointer-events:none;
}

/* =========================================================
   页脚：港口深蓝
   ========================================================= */

.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,96px);
  background:linear-gradient(180deg,var(--c-ink-2) 0%, #071B2B 100%);
  border-top:1px solid rgba(53,224,208,.16);
  color:var(--c-slate);
  font-size:14px;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:min(320px,46%);
  height:2px;
  background:linear-gradient(90deg,var(--c-cyan),rgba(53,224,208,0));
}

.footer-inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(48px,6vw,80px) var(--gutter) 28px;
}

.footer-top{
  display:grid;
  grid-template-columns:1.35fr 1.5fr 1.15fr;
  gap:clamp(28px,4vw,64px);
  align-items:start;
}

.footer-brand__link{
  display:inline-block;
  font-size:22px;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--c-mist);
  transition:color .25s var(--ease);
}
.footer-brand__link:hover{ color:var(--c-cyan); }

.footer-brand__line{
  margin-top:8px;
  font-size:13px;
  line-height:1.7;
  color:var(--c-slate);
}

.footer-app-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:20px;
  padding-bottom:3px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--c-cyan);
  border-bottom:1px solid rgba(53,224,208,.42);
  transition:border-color .25s var(--ease),color .25s var(--ease);
}
.footer-app-link:hover{ border-bottom-color:var(--c-cyan); }
.footer-app-link__arrow{ transition:transform .25s var(--ease); }
.footer-app-link:hover .footer-app-link__arrow{ transform:translateX(4px); }

.footer-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px 24px;
}

.footer-nav__label{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--c-line);
}

.footer-nav__group li + li{ margin-top:9px; }

.footer-nav__link{
  position:relative;
  display:inline-block;
  font-size:14px;
  color:var(--c-slate);
  transition:color .22s var(--ease);
}
.footer-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-2px;
  width:0;
  height:1px;
  background:var(--c-cyan);
  transition:width .28s var(--ease);
}
.footer-nav__link:hover{ color:var(--c-mist); }
.footer-nav__link:hover::after{ width:100%; }

.footer-contact__label{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--c-line);
}
.footer-contact__row{
  display:flex;
  gap:10px;
  font-size:13px;
  line-height:1.65;
  color:var(--c-slate);
  overflow-wrap:anywhere;
}
.footer-contact__row + .footer-contact__row{ margin-top:8px; }
.footer-contact__key{
  flex:0 0 auto;
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--c-sand);
}
.footer-contact__note{
  margin-top:16px;
  padding-top:14px;
  font-size:12px;
  line-height:1.7;
  color:#8FABB9;
  border-top:1px solid rgba(90,125,147,.24);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  margin-top:clamp(32px,5vw,56px);
  padding-top:20px;
  border-top:1px solid rgba(90,125,147,.24);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:#8FABB9;
}
.footer-copy{ margin:0; }
.footer-note{ margin:0; }

/* =========================================================
   显现（JS 协议驱动）
   ========================================================= */

[data-armed]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
}
[data-armed][data-revealed]{
  opacity:1;
  transform:none;
}

/* =========================================================
   响应式
   ========================================================= */

@media (max-width:1080px){
  .nav-dock__link{ padding:9px 11px; font-size:13px; }
  .brand-ver{ display:none; }
}

@media (max-width:900px){
  .site-header{ padding-top:10px; }
  .header-inner{ gap:12px; padding-bottom:12px; }

  .nav-toggle{ display:inline-flex; }
  .header-cta{ display:none; }

  .nav-dock{
    position:absolute;
    top:calc(100% + 8px);
    left:12px;
    right:12px;
    z-index:5;
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    padding:12px;
    background:rgba(11,34,57,.99);
    border:1px solid rgba(53,224,208,.2);
    border-radius:20px;
    box-shadow:0 34px 64px -24px rgba(0,0,0,.9);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s linear;
  }
  .nav-dock[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }

  .nav-dock__link{
    padding:12px 14px;
    font-size:15px;
    border-radius:12px;
  }
  .nav-dock__link:hover{ background:rgba(53,224,208,.1); }

  .nav-dock__cta{
    display:flex;
    align-items:center;
    justify-content:center;
    margin-top:8px;
    padding:12px 16px;
    font-size:14px;
    font-weight:700;
    color:var(--c-ink);
    background:var(--c-coral);
    border-radius:12px;
  }

  .footer-top{
    grid-template-columns:1fr;
    gap:36px;
  }
  .footer-nav{ gap:24px; }
}

@media (max-width:640px){
  body{ font-size:15.5px; line-height:1.75; }
  .brand-text{ font-size:15px; }
  .brand-mark{ width:18px; height:18px; }

  .footer-nav{ grid-template-columns:1fr; gap:26px; }
  .footer-bottom{ flex-direction:column; align-items:flex-start; }
  .footer-inner{ padding-bottom:24px; }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  [data-armed]{ transform:none !important; transition:opacity .25s linear !important; }
  .btn:hover,.panel--hover:hover{ transform:none; }
}