/* ============ 基础重置 ============ */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,p,figure,blockquote,address{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
address{font-style:normal}

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

::selection{background:var(--cyan);color:var(--ink)}

/* ============ 设计变量 ============ */
:root{
  --ink:#0B1220;
  --ink-2:#141E33;
  --cyan:#33E6C4;
  --orange:#FF7A3D;
  --grass:#6BE39B;
  --paper:#F2E9D8;
  --paper-ink:#1A1512;
  --mist:#9AABC4;
  --white:#F7FAFF;
  --deep-teal:#0E3B39;
  --alert:#E4573D;

  --line:rgba(154,171,196,.20);
  --line-strong:rgba(154,171,196,.42);

  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --gutter:72px;
  --maxw:1440px;
  --radius-s:6px;
  --radius-m:14px;
  --radius-l:26px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ============ 排版 ============ */
.display-1,
.display-2,
.display-3{
  font-family:var(--font-display);
  font-weight:800;
  font-stretch:condensed;
  line-height:1.05;
  letter-spacing:-.02em;
  color:var(--white);
  text-wrap:balance;
}
.display-1{font-size:clamp(2.6rem,5.4vw,4rem)}
.display-2{font-size:clamp(2rem,3.8vw,3rem)}
.display-3{font-size:clamp(1.55rem,2.6vw,2.25rem)}

.lede{
  max-width:46ch;
  font-size:1.0625rem;
  line-height:1.75;
  color:var(--mist);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:currentColor;
}

.label{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  font-size:11.5px;
  letter-spacing:.12em;
  line-height:1.6;
  color:var(--mist);
  white-space:nowrap;
}
.label--cyan{border-color:rgba(51,230,196,.55);color:var(--cyan)}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}
.num--xl{
  display:inline-block;
  font-size:clamp(2rem,4vw,3.2rem);
  font-weight:700;
  line-height:1;
  color:var(--orange);
}

/* ============ 布局 ============ */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{
  position:relative;
  padding-block:96px;
}
.section--tight{padding-block:64px}

.section--paper{
  background-color:var(--paper);
  background-image:radial-gradient(rgba(26,21,18,.10) 1px,transparent 1px);
  background-size:22px 22px;
  color:var(--paper-ink);
}
.section--paper .display-1,
.section--paper .display-2,
.section--paper .display-3{color:var(--paper-ink)}
.section--paper .lede{color:#4A4034}
.section--paper .eyebrow{color:#0E6B5E}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:28px;
  margin-bottom:44px;
}

.grid{display:grid;gap:24px}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}

.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:1 / -1}

.canvas-split{
  display:grid;
  grid-template-columns:minmax(112px,18%) minmax(0,1fr);
  gap:48px;
  align-items:start;
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  transition:transform .2s var(--ease),background-color .2s,color .2s,border-color .2s,box-shadow .2s;
}
.btn--primary{background:var(--orange);color:#1A1512}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(255,122,61,.26)}
.btn--ghost{border-color:var(--line-strong);color:var(--white)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--paper{background:var(--paper-ink);color:var(--paper)}
.btn--paper:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(26,21,18,.24)}
.btn--block{width:100%}
.section--paper .btn--ghost{border-color:rgba(26,21,18,.28);color:var(--paper-ink)}
.section--paper .btn--ghost:hover{border-color:var(--deep-teal);color:var(--deep-teal)}

/* ============ 面包屑 ============ */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--mist);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{color:var(--mist);transition:color .18s}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__sep{color:rgba(154,171,196,.45)}
.breadcrumb__item[aria-current="page"]{color:var(--white)}

/* ============ 页头 ============ */
.skip-link{
  position:fixed;
  left:16px;
  top:-72px;
  z-index:200;
  padding:12px 18px;
  border-radius:0 0 12px 12px;
  background:var(--cyan);
  color:var(--ink);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:
    radial-gradient(120% 180% at 8% -70%,rgba(107,227,155,.20),rgba(11,18,32,0) 62%),
    rgba(11,18,32,.94);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}

.header-bar{
  max-height:56px;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  transition:max-height .34s var(--ease),opacity .2s linear,visibility .34s;
}
.header-bar__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  height:56px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--white);
  flex:0 0 auto;
}
.brand__mark{
  display:inline-grid;
  grid-template-columns:repeat(3,4px);
  align-items:end;
  gap:3px;
  height:18px;
}
.brand__mark i{display:block;width:4px;border-radius:1px;background:var(--cyan)}
.brand__mark i:nth-child(1){height:9px}
.brand__mark i:nth-child(2){height:18px;background:var(--white)}
.brand__mark i:nth-child(3){height:13px;background:var(--orange)}
.brand__text{display:flex;align-items:baseline;gap:10px}
.brand__name{font-size:16px;font-weight:800;letter-spacing:.06em}
.brand__line{font-size:11.5px;letter-spacing:.2em;color:var(--mist);white-space:nowrap}

.header-utility{
  display:flex;
  align-items:center;
  gap:14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--mist);
}
.utility-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 0 rgba(51,230,196,.55);
  animation:signal 2.8s var(--ease) infinite;
}
@keyframes signal{
  0%{box-shadow:0 0 0 0 rgba(51,230,196,.55)}
  70%{box-shadow:0 0 0 8px rgba(51,230,196,0)}
  100%{box-shadow:0 0 0 0 rgba(51,230,196,0)}
}
.utility-line{white-space:nowrap}
.utility-sep{width:1px;height:12px;background:var(--line-strong)}
.utility-mail{color:var(--white);white-space:nowrap}

.nav-rail__inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:64px;
  transition:min-height .3s var(--ease);
}

.brand--compact{
  display:none;
  gap:9px;
}
.brand--compact .brand__mark{height:14px}
.brand--compact .brand__mark i:nth-child(2){height:14px}
.brand--compact .brand__mark i:nth-child(3){height:10px}
.brand--compact .brand__mark i:nth-child(1){height:7px}
.brand--compact .brand__name{font-size:13.5px;letter-spacing:.08em}

.rail-ticks{
  flex:1 1 auto;
  min-width:24px;
  height:10px;
  opacity:.75;
  background-image:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 12px);
}

.primary-nav{
  display:flex;
  align-items:center;
  flex:0 0 auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-link{
  position:relative;
  display:inline-block;
  padding:10px 13px;
  border-radius:var(--radius-s);
  font-size:14px;
  color:var(--mist);
  transition:color .2s,background-color .2s;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:5px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .24s var(--ease),background-color .24s;
}
.nav-link:hover,
.nav-link:focus-visible{color:var(--white)}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--white);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.nav-cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 18px;
  border-radius:999px;
  background:var(--orange);
  color:#1A1512;
  font-size:13px;
  font-weight:800;
  letter-spacing:.06em;
  transition:transform .2s var(--ease),box-shadow .2s,background-color .2s;
}
.nav-cta::after{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:#1A1512;
  opacity:.6;
}
.nav-cta:hover{background:#FF8B55;transform:translateY(-1px);box-shadow:0 10px 26px rgba(255,122,61,.28)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  flex:0 0 auto;
  padding:9px 14px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:var(--ink-2);
  color:var(--white);
  font-size:13px;
  letter-spacing:.08em;
  transition:color .2s,border-color .2s;
}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .24s var(--ease),opacity .2s;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transform:scaleX(var(--scroll-progress,0));
  transform-origin:0 50%;
  opacity:.9;
}

/* ============ 轮次轨道与刻度 ============ */
.rail{
  position:sticky;
  top:120px;
  align-self:start;
  display:grid;
  gap:18px;
}
.rail__label{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  color:var(--mist);
  padding-left:2px;
}
.rail-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  border-left:1px solid var(--line);
}
.rail-item{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:8px 0 8px 18px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--mist);
  text-align:left;
  transition:color .2s;
}
.rail-item::before{
  content:"";
  position:absolute;
  left:-1px;
  top:50%;
  width:2px;
  height:0;
  background:var(--cyan);
  transform:translateY(-50%);
  transition:height .24s var(--ease);
}
.rail-item:hover{color:var(--white)}
.rail-item.is-active,
.rail-item[aria-current="true"]{color:var(--cyan)}
.rail-item.is-active::before,
.rail-item[aria-current="true"]::before{height:70%}

.tick-scale{
  display:flex;
  align-items:flex-end;
  gap:6px;
  height:28px;
}
.tick-scale i{
  display:block;
  width:2px;
  height:10px;
  border-radius:1px;
  background:var(--line-strong);
}
.tick-scale i:nth-child(3n){height:24px;background:var(--cyan)}
.tick-scale i:nth-child(4n){background:var(--orange);height:16px}

/* ============ 图片容器 ============ */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--line);
  border-radius:var(--radius-l);
  background:
    radial-gradient(90% 130% at 18% 0%,rgba(107,227,155,.22),rgba(11,18,32,0) 62%),
    radial-gradient(70% 90% at 92% 100%,rgba(51,230,196,.16),rgba(11,18,32,0) 66%),
    var(--ink-2);
}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.22;
  background-image:repeating-linear-gradient(0deg,rgba(11,18,32,.55) 0 1px,transparent 1px 4px);
}
.media-frame__cap{
  position:absolute;
  left:16px;
  right:16px;
  bottom:14px;
  z-index:1;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(247,250,255,.82);
}

/* ============ 正文 ============ */
.prose{
  max-width:68ch;
  font-size:16.5px;
  line-height:1.8;
  color:#D9E3F0;
}
.prose > * + *{margin-top:1.2em}
.prose h2{
  font-family:var(--font-display);
  font-size:clamp(1.4rem,2.2vw,1.9rem);
  font-weight:800;
  line-height:1.28;
  letter-spacing:-.01em;
  color:var(--white);
}
.prose h3{font-size:1.1rem;font-weight:700;color:var(--white)}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose ul{display:grid;gap:.55em}
.prose ul > li{position:relative;padding-left:20px}
.prose ul > li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:9px;
  height:1px;
  background:var(--orange);
}
.prose blockquote{
  padding:24px 26px;
  border-radius:var(--radius-m);
  background:var(--paper);
  color:var(--paper-ink);
  font-size:1.02rem;
}
.prose code{
  font-family:var(--font-mono);
  font-size:.92em;
  padding:2px 6px;
  border:1px solid var(--line);
  border-radius:4px;
  background:var(--ink-2);
}
.section--paper .prose{color:#40372F}
.section--paper .prose h2,
.section--paper .prose h3{color:var(--paper-ink)}
.section--paper .prose a{color:#0E6B5E}
.section--paper .prose blockquote{background:#FFFDF7;border:1px solid rgba(26,21,18,.12)}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  overflow:hidden;
  border-top:1px solid var(--line);
  background:var(--ink);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:auto -10% -50% -10%;
  height:78%;
  pointer-events:none;
  background:
    radial-gradient(58% 100% at 18% 100%,rgba(107,227,155,.16),rgba(11,18,32,0) 70%),
    radial-gradient(52% 100% at 88% 100%,rgba(51,230,196,.12),rgba(11,18,32,0) 72%);
}

.footer-grid{
  position:relative;
  display:grid;
  grid-template-columns:1.4fr .85fr .85fr 1.1fr;
  gap:48px;
  padding-block:80px 56px;
}
.footer-col{min-width:0}
.footer-brand{
  font-family:var(--font-display);
  font-size:1.5rem;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--white);
}
.footer-tagline{
  margin-top:12px;
  max-width:26ch;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}
.footer-icp{
  margin-top:22px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--mist);
}
.footer-heading{
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.24em;
  color:var(--cyan);
}
.footer-subhead{
  margin:16px 0 8px;
  font-size:11.5px;
  letter-spacing:.2em;
  color:rgba(154,171,196,.7);
}
.footer-subhead:first-of-type{margin-top:0}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;
  color:#CBD6E4;
  transition:color .18s,padding-left .2s var(--ease);
}
.footer-link:hover{color:var(--white);padding-left:6px}
.footer-contact{
  margin-top:18px;
  font-size:13.5px;
  line-height:1.95;
  color:#CBD6E4;
  word-break:break-word;
}
.footer-note{
  margin-top:10px;
  font-size:12px;
  line-height:1.7;
  color:var(--mist);
}
.footer-bottom{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:12px;
  padding-block:20px 30px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--mist);
}
.footer-copy,
.footer-updated{margin:0}

/* ============ 显现动效 ============ */
.js-reveal .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .34s var(--ease),transform .34s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
.js-reveal .reveal.is-in{
  opacity:1;
  transform:none;
}

/* ============ 响应式 ============ */
@media (max-width:1200px){
  :root{--gutter:48px}
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr;gap:40px}
  .footer-col--brand{grid-column:1 / -1}
  .footer-col--brand .footer-tagline{max-width:52ch}
}

@media (max-width:1000px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4{grid-column:span 3}
  .col-5,.col-6,.col-7,.col-8,.col-9{grid-column:span 6}
  .canvas-split{grid-template-columns:minmax(0,1fr);gap:32px}
  .rail{position:static;top:auto}
  .rail-list{
    flex-direction:row;
    flex-wrap:wrap;
    gap:8px;
    border-left:0;
    border-top:1px solid var(--line);
    padding-top:12px;
  }
  .rail-item{padding:6px 12px 6px 0}
  .rail-item::before{display:none}
  .rail__label{writing-mode:horizontal-tb;letter-spacing:.2em}
}

@media (max-width:900px){
  html{scroll-padding-top:96px}

  .header-bar__inner{height:52px;gap:12px}
  .header-bar{max-height:52px}
  .brand__line{display:none}
  .utility-line{display:none}
  .utility-sep{display:none}

  .nav-rail__inner{
    flex-wrap:wrap;
    gap:12px;
    min-height:56px;
    padding-block:8px;
  }
  .rail-ticks{order:0;flex:1 1 auto;height:8px}
  .brand--compact{display:none}
  .nav-cta{order:1;margin-left:auto;padding:8px 15px;font-size:12.5px}
  .nav-toggle{order:2;display:inline-flex}
  .primary-nav{
    order:3;
    flex-basis:100%;
    width:100%;
    display:grid;
    grid-template-rows:0fr;
    transition:grid-template-rows .32s var(--ease);
  }
  .nav-list{
    overflow:hidden;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
  }
  .nav-link{
    padding:14px 2px;
    font-size:15px;
    border-bottom:1px solid var(--line);
    border-radius:0;
    color:#C4D0E0;
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .primary-nav[data-open]{grid-template-rows:1fr}

  .section{padding-block:64px}
  .section--tight{padding-block:44px}
  .footer-grid{padding-block:56px 40px;gap:32px}
  .footer-bottom{padding-block:18px 24px}
}

@media (max-width:640px){
  :root{--gutter:20px}
  body{font-size:16px}
  .grid--12{grid-template-columns:minmax(0,1fr)}
  .grid--12 > *{grid-column:1 / -1}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .media-frame{border-radius:var(--radius-m)}
  .section-head{margin-bottom:28px}
  .btn{padding:12px 20px;font-size:13.5px}
}

/* ============ 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;
  }
  .js-reveal .reveal{opacity:1;transform:none}
  .utility-dot{animation:none}
}