/* ============================================================
   K1看台 · 共享样式  /assets/site.css
   夜间数据舱 × 品牌手册式纵向长卷
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink:#06111F;
  --cabin:#0B1D33;
  --cabin-2:#0E2440;
  --paper:#F2E9D8;
  --paper-ink:#122233;
  --cyan:#22F0D3;
  --orange:#FF7A3D;
  --sage:#7FA99B;
  --mist:#A9B8C7;
  --white:#F8FBFF;
  --coral:#FF5C7A;
  --amber:#FFD166;

  --line:rgba(169,184,199,.18);
  --line-soft:rgba(169,184,199,.1);
  --line-strong:rgba(169,184,199,.34);
  --cyan-line:rgba(34,240,211,.36);

  --shell:1240px;
  --gutter:clamp(16px,4vw,44px);
  --radius:18px;
  --radius-lg:26px;
  --radius-paper:32px 12px 32px 12px;

  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Arial Narrow",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:clamp(15px,.62vw + 13px,17px);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:var(--cyan);color:#04202a}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

/* ---------- 3. 中文排版体系 ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.14;letter-spacing:-.018em;color:var(--white);text-wrap:balance}
h1{font-size:clamp(2.3rem,5.6vw,4.6rem);letter-spacing:-.032em;line-height:1.04}
h2{font-size:clamp(1.65rem,3.4vw,2.7rem)}
h3{font-size:clamp(1.15rem,1.7vw,1.5rem);font-weight:700;line-height:1.3}
h4{font-size:1.02rem;font-weight:700;line-height:1.45}
p{color:var(--mist)}
strong{color:var(--white)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);margin:0 0 .9em;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.8}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 4. 布局容器 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(40px,6vw,82px)}
.section--tight{padding-block:clamp(24px,3.4vw,44px)}
.grid{display:grid;gap:clamp(14px,2.1vw,26px)}
.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))}

/* ---------- 5. 通用按钮 ---------- */
.btn{
  --btn-bg:transparent;--btn-fg:var(--white);--btn-bd:var(--line-strong);
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.72em 1.2em;border-radius:999px;
  background:var(--btn-bg);color:var(--btn-fg);border:1px solid var(--btn-bd);
  font-size:.9rem;font-weight:600;line-height:1.2;letter-spacing:.01em;
  cursor:pointer;transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--signal{
  --btn-bg:var(--cyan);--btn-fg:#04202a;--btn-bd:var(--cyan);
  box-shadow:0 10px 26px -16px rgba(34,240,211,.95),inset 0 1px 0 rgba(255,255,255,.4);
}
.btn--signal:hover{--btn-bg:#6bf8e4;--btn-bd:#6bf8e4;box-shadow:0 14px 30px -16px rgba(34,240,211,1)}
.btn--warm{
  --btn-bg:var(--orange);--btn-fg:#1c0a02;--btn-bd:var(--orange);
  box-shadow:0 10px 26px -16px rgba(255,122,61,.95);
}
.btn--warm:hover{--btn-bg:#ff9563;--btn-bd:#ff9563}
.btn--ghost{--btn-bg:rgba(11,29,51,.55);--btn-fg:var(--white);--btn-bd:var(--line-strong)}
.btn--ghost:hover{--btn-bd:var(--cyan-line);--btn-fg:var(--cyan)}
.btn--paper{--btn-bg:var(--paper);--btn-fg:var(--paper-ink);--btn-bd:transparent}
.btn--paper:hover{--btn-bg:#fff6e4}

/* ---------- 6. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.3em .72em;border-radius:999px;
  border:1px solid var(--line-strong);background:rgba(11,29,51,.62);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  color:var(--mist);white-space:nowrap;
}
.tag .num{font-weight:600}
.tag--cyan{color:var(--cyan);border-color:var(--cyan-line);background:rgba(34,240,211,.1)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,61,.42);background:rgba(255,122,61,.1)}
.tag--sage{color:var(--sage);border-color:rgba(127,169,155,.42);background:rgba(127,169,155,.1)}
.tag--amber{color:var(--amber);border-color:rgba(255,209,102,.42);background:rgba(255,209,102,.1)}
.tag--coral{color:var(--coral);border-color:rgba(255,92,122,.42);background:rgba(255,92,122,.1)}

/* ---------- 7. 面板 ---------- */
.panel{
  position:relative;
  padding:clamp(16px,2.4vw,26px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(165deg,var(--cabin) 0%,#091827 100%);
}
.panel--line{background:transparent;border-color:var(--line-strong)}
.panel--paper{
  background:
    radial-gradient(120% 90% at 100% 0%,rgba(255,255,255,.6),transparent 60%),
    var(--paper);
  border-color:transparent;border-radius:var(--radius-paper);
  color:var(--paper-ink);
}
.panel--paper h1,.panel--paper h2,.panel--paper h3,.panel--paper h4,.panel--paper strong{color:var(--paper-ink)}
.panel--paper p{color:#31465a}
.panel--paper .eyebrow{color:#0f6f66}

/* ---------- 8. 图片容器（页面阶段放图） ---------- */
.figure{
  position:relative;margin:0;
  border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;background:linear-gradient(140deg,#0D2340,#081625);
}
.figure__frame{position:relative;aspect-ratio:16/9;overflow:hidden}
.figure--tall .figure__frame{aspect-ratio:4/5}
.figure--square .figure__frame{aspect-ratio:1/1}
.figure--wide .figure__frame{aspect-ratio:21/9}
.figure__frame img{width:100%;height:100%;object-fit:cover}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(34,240,211,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,240,211,.14) 1px,transparent 1px);
  background-size:48px 48px;opacity:.35;
}
.figure__cap{
  padding:.68em 1em;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.05em;color:var(--mist);
}
.figure--bleed{border-radius:0;border-inline:0}

/* ---------- 9. 面包屑与正文容器 ---------- */
.breadcrumbs{padding-block:clamp(14px,2vw,22px)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;color:var(--mist)}
.breadcrumbs li{display:inline-flex;align-items:center;gap:.5em}
.breadcrumbs li + li::before{content:"/";color:var(--sage);opacity:.6}
.breadcrumbs a{color:var(--mist);transition:color .2s}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--white)}

.prose{max-width:74ch;font-size:1.01rem}
.prose > * + *{margin-top:1.05em}
.prose h2{margin-top:1.9em}
.prose h3{margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.3em;color:var(--mist)}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.45em}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:.22em;text-decoration-thickness:1px}
.prose a:hover{color:var(--white)}
.prose blockquote{margin:1.6em 0;padding:.2em 0 .2em 1.1em;border-left:2px solid var(--cyan);color:var(--white)}
.prose code{font-family:var(--font-mono);font-size:.9em;background:rgba(34,240,211,.1);color:var(--cyan);padding:.15em .45em;border-radius:5px}

/* ---------- 10. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:500;
  padding:.65em 1.1em;border-radius:9px;
  background:var(--cyan);color:#04202a;font-weight:700;font-size:.86rem;
  transform:translateY(-200%);transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ============================================================
   11. 页头
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:120;
  background:linear-gradient(180deg,rgba(6,17,31,.95) 0%,rgba(6,17,31,.66) 58%,rgba(6,17,31,0) 100%);
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header.is-scrolled{
  background:rgba(9,24,42,.97);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom-color:rgba(34,240,211,.24);
  box-shadow:0 20px 44px -34px #000,0 1px 0 rgba(34,240,211,.1);
}

/* 信号带 */
.header-signal{
  background:rgba(6,17,31,.55);
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--mist);
}
.header-signal__inner{
  display:flex;align-items:center;gap:.75em;
  min-height:30px;padding-block:4px;flex-wrap:wrap;
}
.signal-led{
  width:7px;height:7px;border-radius:50%;flex:0 0 auto;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(34,240,211,.16),0 0 12px rgba(34,240,211,.9);
  animation:signal-pulse 2.8s var(--ease) infinite;
}
@keyframes signal-pulse{0%,100%{opacity:1}50%{opacity:.36}}
.signal-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.signal-num{color:var(--cyan);font-weight:600}
.signal-support{margin-left:auto;color:var(--sage);letter-spacing:.06em}

/* 主导航条 */
.header-bar{position:relative}
.header-bar__inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  min-height:64px;padding-block:10px;
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:.62em;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;width:38px;height:38px;border-radius:11px;
  background:linear-gradient(150deg,var(--cyan),#10b8a3);
  color:#04202a;font-family:var(--font-mono);font-weight:700;font-size:.92rem;letter-spacing:-.03em;
  box-shadow:0 10px 22px -16px var(--cyan),inset 0 1px 0 rgba(255,255,255,.45);
}
.brand__text{display:flex;flex-direction:column;line-height:1.12}
.brand__name{font-family:var(--font-display);font-size:1.02rem;font-weight:800;letter-spacing:.05em;color:var(--white)}
.brand__line{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.24em;color:var(--sage);text-transform:uppercase}

/* 导航 */
.site-nav{margin-left:auto;display:flex;align-items:center;gap:clamp(6px,1.2vw,16px)}
.site-nav__list{display:flex;align-items:center;gap:clamp(2px,.9vw,12px)}
.site-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:.42em;
  padding:.58em .58em;border-radius:8px;
  color:var(--mist);font-size:.92rem;font-weight:500;
  transition:color .2s var(--ease);
}
.nav-index{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.1em;color:var(--sage);transition:color .2s var(--ease)}
.site-nav__link::after{
  content:"";position:absolute;left:.58em;right:.58em;bottom:.14em;height:1px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .26s var(--ease),background .2s var(--ease);
}
.site-nav__link:hover{color:var(--white)}
.site-nav__link:hover .nav-index{color:var(--cyan)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--white);font-weight:600}
.site-nav__link[aria-current="page"] .nav-index{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}
.nav-cta{flex:0 0 auto;margin-left:.4em;padding:.62em 1.05em;font-size:.82rem}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:.55em;margin-left:auto;
  padding:.55em .82em;border-radius:10px;
  background:rgba(11,29,51,.88);border:1px solid var(--line-strong);
  color:var(--white);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;
  cursor:pointer;transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-line)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:12px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:var(--cyan);transition:transform .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

/* 阅读进度光带 */
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(169,184,199,.12);overflow:hidden;pointer-events:none}
.scroll-progress__fill{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:transform .12s linear;
}

/* ============================================================
   12. 页脚
   ============================================================ */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,8vw,110px);
  background:var(--ink);
  border-top:1px solid rgba(34,240,211,.2);
  color:var(--mist);
}
.footer-decor{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.footer-decor::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(600px 240px at 86% -6%,rgba(34,240,211,.16),transparent 70%),
    radial-gradient(460px 220px at 6% 104%,rgba(255,122,61,.11),transparent 70%);
}
.footer-decor::after{
  content:"K1";position:absolute;right:-3%;bottom:-24%;
  font-family:var(--font-mono);font-weight:700;line-height:.8;letter-spacing:-.06em;
  font-size:clamp(140px,26vw,320px);
  color:transparent;-webkit-text-stroke:1px rgba(169,184,199,.1);
}
.footer-inner{position:relative;z-index:1;padding-block:clamp(34px,5vw,62px) clamp(18px,2.6vw,26px)}

.footer-top{
  display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);
  gap:clamp(20px,4vw,48px);align-items:end;
  padding-bottom:clamp(24px,3.4vw,40px);
  border-bottom:1px solid var(--line);
}
.footer-kicker{
  margin:0 0 .85em;font-family:var(--font-mono);font-size:.7rem;
  letter-spacing:.26em;text-transform:uppercase;color:var(--cyan);
}
.footer-title{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(1.9rem,4.4vw,3.2rem);line-height:1.02;letter-spacing:-.028em;
  color:var(--white);
}
.footer-title__accent{color:var(--cyan)}
.footer-summary{margin-top:.85em;max-width:42ch;font-size:.94rem;color:var(--mist)}
.footer-status{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-start}
@media (min-width:861px){.footer-status{justify-content:flex-end}}

.footer-cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,40px);
  padding-block:clamp(24px,3.4vw,40px);
}
.footer-col__title{
  margin:0 0 1em;font-family:var(--font-mono);font-weight:600;font-size:.68rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--sage);
}
.footer-links{display:grid;gap:.62em}
.footer-link{
  display:inline-flex;align-items:center;gap:.55em;
  font-size:.93rem;color:var(--mist);
  transition:color .2s var(--ease);
}
.footer-link::before{
  content:"";width:5px;height:5px;border-radius:50%;flex:0 0 auto;
  background:var(--sage);opacity:.55;transition:background .2s var(--ease),opacity .2s var(--ease);
}
.footer-link:hover{color:var(--white)}
.footer-link:hover::before{background:var(--cyan);opacity:1}

.footer-contact{display:grid;gap:.78em;font-size:.88rem}
.footer-contact__row{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.75em;align-items:baseline}
.footer-contact__label{
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--sage);
}
.footer-contact__value{color:var(--white);word-break:break-word;line-height:1.5}
.footer-copybar{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;margin-top:1em}
.footer-copy{
  display:inline-flex;align-items:center;gap:.45em;
  padding:.5em .88em;border-radius:999px;
  border:1px solid var(--cyan-line);background:rgba(34,240,211,.08);
  color:var(--cyan);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  cursor:pointer;transition:background .2s var(--ease),border-color .2s var(--ease);
}
.footer-copy:hover{background:rgba(34,240,211,.17);border-color:rgba(34,240,211,.6)}
.footer-copy__status{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:var(--sage);min-height:1em}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.6em 1.6em;
  padding-top:clamp(15px,2.2vw,22px);
  border-top:1px solid var(--line);
}
.footer-legal{
  font-family:var(--font-mono);font-size:.73rem;letter-spacing:.06em;color:var(--mist);
}
.footer-legal--icp{color:var(--sage)}

/* ============================================================
   13. 响应式
   ============================================================ */
@media (max-width:1240px){
  .nav-index{display:none}
}
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    display:block;margin-left:0;
    padding:10px var(--gutter) 20px;
    background:rgba(9,24,42,.99);
    -webkit-backdrop-filter:blur(16px);
    backdrop-filter:blur(16px);
    border-bottom:1px solid rgba(34,240,211,.26);
    box-shadow:0 34px 64px -34px #000;
    max-height:calc(100vh - 96px);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{
    justify-content:flex-start;gap:.8em;
    padding:.88em .35em;font-size:1rem;
    border-bottom:1px solid var(--line-soft);border-radius:0;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--cyan)}
  .site-nav__link[aria-current="page"] .nav-index{display:inline;color:var(--orange)}
  .nav-cta{margin-top:16px;width:100%;padding:.8em 1.2em;font-size:.9rem}
}
@media (max-width:860px){
  .signal-support{display:none}
  .header-signal{font-size:.64rem;letter-spacing:.05em}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .footer-col:last-child{grid-column:1 / -1}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .header-bar__inner{min-height:58px;gap:10px}
  .brand__line{display:none}
  .brand__mark{width:34px;height:34px;border-radius:10px;font-size:.84rem}
  .brand__name{font-size:.98rem}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-col:last-child{grid-column:auto}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-decor::after{font-size:170px;right:-6%;bottom:-14%}
  .section{padding-block:clamp(30px,7vw,48px)}
  .figure--wide .figure__frame{aspect-ratio:16/10}
}

/* ---------- 14. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .signal-led{animation:none}
  .btn:hover{transform:none}
  .scroll-progress__fill{transition:none}
}