/* ================= 01. 重置 ================= */
*,
*::before,
*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:150px;
}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:300;line-height:1.12;letter-spacing:-.01em}

/* ================= 02. 变量 ================= */
:root{
  --navy:#061A3B;
  --midnight:#0B2450;
  --cyan:#00D9F5;
  --ice:#A8F6FF;
  --orange:#FF5B3D;
  --coral:#FFB4A3;
  --paper:#F5F8FD;
  --paper-blue:#E6EEF8;
  --ink:#10233F;
  --green:#24C79A;
  --mist:#8FA3BF;
  --cyan-deep:#0A7C92;
  --line:rgba(16,35,63,.12);
  --line-dark:rgba(168,246,255,.18);
  --text-soft:#C4D5EC;
  --shell:1240px;
  --pad:clamp(18px,4vw,40px);
  --radius:14px;
  --radius-sm:10px;
  --cut:22px;
  --font-display:"Alibaba PuHuiTi 3.0","Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ================= 03. 中文排版与基础元素 ================= */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.005em;
  min-height:100vh;
  text-rendering:optimizeLegibility;
}
h1{font-size:clamp(38px,7.4vw,92px);line-height:.98;letter-spacing:-.02em}
h2{font-size:clamp(26px,4vw,48px);line-height:1.1}
h3{font-size:clamp(19px,2.4vw,26px);font-weight:500;line-height:1.3}
h4{font-size:clamp(17px,2vw,20px);font-weight:500;line-height:1.35}
strong{font-weight:600}
p{max-width:74ch}
::selection{background:var(--cyan);color:var(--navy)}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:4px}
.section--dark :focus-visible,
.site-footer :focus-visible{outline-color:var(--coral)}
i{font-style:normal}

/* ================= 04. 布局骨架 ================= */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--dark{background:var(--navy);color:var(--paper)}
.section--dark p{color:var(--text-soft)}
.section-head{display:grid;gap:10px;max-width:62ch;margin-bottom:clamp(24px,4vw,44px)}
.section-index{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.26em;
  color:var(--cyan-deep);
  text-transform:uppercase;
}
.section--dark .section-index{color:var(--cyan)}
.prose{max-width:68ch;font-size:17px;line-height:1.78}
.prose p+p{margin-top:1em}
.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);
  white-space:nowrap;border:0;
}

/* ================= 05. 网格 ================= */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (min-width:901px){
  .grid--offset > *:nth-child(even){transform:translateY(30px)}
}

/* ================= 06. 按钮 ================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:48px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:12px;
  font-size:15px;
  font-weight:600;
  line-height:1.2;
  transition:transform .18s var(--ease),background-color .18s var(--ease),
             border-color .18s var(--ease),color .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--orange);color:#0A1626}
.btn--primary:hover{background:#FF7259}
.btn--outline{border-color:rgba(16,35,63,.28);color:var(--ink)}
.btn--outline:hover{border-color:var(--cyan-deep);color:var(--cyan-deep)}
.btn--ghost{background:rgba(0,217,245,.08);border-color:rgba(168,246,255,.4);color:var(--ice)}
.btn--ghost:hover{background:rgba(0,217,245,.18);color:#fff}
.btn--block{width:100%}

/* ================= 07. 标签与卡片 ================= */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px;
  border-radius:6px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.06em;
  background:var(--paper-blue);
  color:var(--ink);
}
.tag--cyan{background:rgba(0,217,245,.16);border:1px solid rgba(0,217,245,.32);color:var(--ice)}
.tag--alert{background:#FFE2DB;color:#9A2510}
.tag--ok{background:#D6F4EB;color:#0A5F49}

.card{
  position:relative;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.6vw,26px);
  transition:transform .22s var(--ease),border-color .22s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:rgba(0,217,245,.6)}
.card--cut{clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%)}
.card--dark{background:var(--midnight);border-color:var(--line-dark);color:var(--paper)}
.card--dark .card__text{color:var(--text-soft)}
.card__title{font-family:var(--font-display);font-size:clamp(18px,2.2vw,22px);font-weight:500;line-height:1.3}
.card__text{font-size:15px;line-height:1.7;color:#41536F}
.card__text + .card__text{margin-top:.7em}
.card__link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--cyan-deep);
  border-bottom:1px solid currentColor;
  padding-bottom:2px;
  transition:color .18s var(--ease);
}
.card__link:hover{color:var(--orange)}
.card--dark .card__link{color:var(--cyan)}

/* ================= 08. 图片容器 ================= */
.media{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  border-radius:var(--radius);
  aspect-ratio:16 / 10;
  background:linear-gradient(135deg,var(--midnight) 0%,#123A72 55%,#0A2145 100%);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(115deg,rgba(0,217,245,.24) 0%,transparent 42%,rgba(255,91,61,.16) 100%);
  pointer-events:none;
}
.media img,
.media video{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  padding:14px 16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ice);
  background:linear-gradient(transparent,rgba(6,26,59,.88));
}

/* ================= 09. 数据条 ================= */
.bar{
  position:relative;
  height:8px;
  border-radius:4px;
  background:rgba(16,35,63,.1);
  overflow:hidden;
}
.section--dark .bar,
.card--dark .bar{background:rgba(168,246,255,.18)}
.bar__fill{
  display:block;
  height:100%;
  width:var(--value,0%);
  border-radius:4px;
  background:linear-gradient(90deg,var(--cyan),var(--green));
  transition:width .7s var(--ease);
}

/* ================= 10. 面包屑 ================= */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"›";color:var(--mist)}
.breadcrumb a{color:inherit;text-decoration:underline;text-underline-offset:3px}
.breadcrumb a:hover{color:var(--cyan-deep)}
.section--dark .breadcrumb a:hover{color:var(--cyan)}

/* ================= 11. 页头 ================= */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  transform:translateY(-220%);
  padding:12px 18px;
  border-radius:10px;
  background:var(--orange);
  color:#0A1626;
  font-size:14px;
  font-weight:700;
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--navy);
  box-shadow:0 1px 0 rgba(168,246,255,.14);
}
.header-top{position:relative;background:var(--navy);overflow:hidden}
.header-top::before{
  content:"";
  position:absolute;
  top:0;right:0;
  width:42%;height:100%;
  background:linear-gradient(120deg,rgba(0,217,245,.18),rgba(0,217,245,0) 70%);
  clip-path:polygon(30% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.header-top__inner{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  min-height:70px;
  padding-block:10px;
}
.brand{display:inline-flex;align-items:center;gap:12px;min-height:48px}
.brand__mark{display:inline-flex;align-items:flex-end;gap:3px;height:24px;transform:skewX(-12deg)}
.brand__mark i{display:block;width:5px;border-radius:2px}
.brand__mark i:nth-child(1){height:12px;background:var(--ice)}
.brand__mark i:nth-child(2){height:24px;background:var(--cyan)}
.brand__mark i:nth-child(3){height:17px;background:var(--orange)}
.brand__text{display:flex;flex-direction:column;line-height:1.2;gap:2px}
.brand__name{
  font-family:var(--font-display);
  font-size:18px;
  font-weight:500;
  letter-spacing:.02em;
  color:#fff;
  transition:color .18s var(--ease);
}
.brand__line{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--mist);
}
.brand:hover .brand__name,
.brand:focus-visible .brand__name{color:var(--cyan)}

.header-tools{display:flex;align-items:center;gap:10px}
.tool-link{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 16px;
  border:1px solid rgba(168,246,255,.3);
  border-radius:999px;
  font-size:13px;
  line-height:1;
  color:var(--ice);
  white-space:nowrap;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.tool-link:hover{background:rgba(0,217,245,.14);border-color:var(--cyan);color:#fff}
.tool-link--cta{
  background:var(--orange);
  border-color:var(--orange);
  color:#0A1626;
  font-weight:700;
}
.tool-link--cta:hover{background:#FF7259;border-color:#FF7259;color:#0A1626}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  min-height:46px;
  padding:0 14px;
  border:1px solid rgba(168,246,255,.3);
  border-radius:999px;
  color:var(--ice);
  font-size:13px;
  line-height:1;
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transition:transform .2s var(--ease),width .2s var(--ease);
}
.nav-toggle__bars i:nth-child(2){width:11px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){width:16px;transform:translateY(-3px) rotate(-45deg)}
.nav-toggle__label{letter-spacing:.08em}

.header-nav{
  background:var(--midnight);
  border-top:1px solid rgba(168,246,255,.1);
}
.header-nav__inner{
  display:flex;
  align-items:center;
  gap:20px;
  min-height:52px;
}
.header-nav__index{
  flex:none;
  padding-right:16px;
  border-right:1px solid rgba(168,246,255,.22);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.28em;
  color:var(--cyan);
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  flex:1 1 auto;
  overflow-x:auto;
  scrollbar-width:none;
}
.nav-list::-webkit-scrollbar{display:none}
.nav-list a{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:52px;
  padding:0 14px;
  font-size:14px;
  white-space:nowrap;
  color:var(--text-soft);
  transition:color .2s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:10px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav-list a:hover{color:#fff}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:#fff;font-weight:500}
.nav-list a[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.read-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  background:rgba(168,246,255,.16);
  pointer-events:none;
}
.read-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width .12s linear;
}

.subscribe-pill{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:90;
  display:inline-flex;
  align-items:center;
  gap:8px;
  max-width:140px;
  min-height:48px;
  padding:0 16px;
  border-radius:999px;
  background:var(--orange);
  color:#0A1626;
  font-size:14px;
  font-weight:700;
  line-height:1;
  box-shadow:0 10px 26px rgba(6,26,59,.3);
  transition:transform .2s var(--ease),background-color .2s var(--ease);
}
.subscribe-pill:hover{transform:translateY(-2px);background:#FF7259}
.subscribe-pill__dot{
  width:8px;height:8px;
  border-radius:50%;
  background:#0A1626;
  box-shadow:0 0 0 3px rgba(10,22,38,.18);
}
.subscribe-pill__text{letter-spacing:.04em}

/* ================= 12. 页脚 ================= */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--navy);
  color:var(--paper);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-35%;right:-12%;
  width:56%;height:130%;
  background:radial-gradient(circle at 60% 42%,rgba(0,217,245,.2),transparent 62%);
  clip-path:polygon(24% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.footer-top{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);
  gap:clamp(28px,5vw,64px);
  padding-block:clamp(40px,6vw,76px) clamp(24px,3vw,36px);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:500;
  letter-spacing:.02em;
  color:#fff;
}
.footer-brand__desc{
  margin-top:12px;
  max-width:36ch;
  font-size:14px;
  line-height:1.72;
  color:#B9CAE2;
}
.footer-brand__tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(148px,1fr));
  gap:clamp(20px,3vw,32px);
}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.18em;
  color:var(--cyan);
}
.footer-links li + li{margin-top:2px}
.footer-links a{
  display:inline-flex;
  align-items:center;
  min-height:34px;
  font-size:14px;
  color:#C4D5EC;
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-links a:hover{color:#fff;transform:translateX(2px)}
.footer-body{position:relative;z-index:1;padding-bottom:clamp(24px,3vw,36px)}
.footer-card{
  display:grid;
  gap:16px;
  padding:clamp(18px,2.6vw,28px);
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  background:rgba(245,248,253,.06);
}
.footer-card__title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.footer-card__list{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:14px 28px;
}
.footer-card__row{display:flex;flex-direction:column;gap:3px}
.footer-card__row dt{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}
.footer-card__row dd{
  font-size:14px;
  line-height:1.6;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-card__note{
  max-width:78ch;
  font-size:13px;
  line-height:1.7;
  color:#A9BCD8;
}
.footer-meta{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:20px 30px;
  border-top:1px solid var(--line-dark);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.footer-copy{margin:0;max-width:none}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal a{color:var(--ice)}
.footer-legal a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.footer-icp{margin:0;max-width:none}

/* ================= 13. 动效 ================= */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ================= 14. 响应式 ================= */
@media (max-width:1100px){
  .footer-top{grid-template-columns:1fr}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-nav{
    max-height:0;
    overflow:hidden;
    transition:max-height .3s var(--ease);
  }
  .header-nav[data-open="true"]{max-height:220px}
  .header-nav__inner{min-height:0;padding-block:10px 16px;gap:0;align-items:flex-start}
  .header-nav__index{display:none}
  .nav-list{gap:8px;padding-bottom:4px;scroll-snap-type:x proximity}
  .nav-list a{
    min-height:48px;
    padding:0 16px;
    border:1px solid rgba(168,246,255,.26);
    border-radius:999px;
    background:rgba(0,217,245,.06);
    scroll-snap-align:start;
  }
  .nav-list a::after{display:none}
  .nav-list a:hover{background:rgba(0,217,245,.16);border-color:var(--cyan)}
  .nav-list a[aria-current="page"]{
    border-color:var(--orange);
    background:rgba(255,91,61,.16);
    color:#fff;
  }
  .brand__line{font-size:9px;letter-spacing:.1em}
  .header-top__inner{min-height:62px}
  .grid--2,
  .grid--3{grid-template-columns:1fr}
  .grid--offset > *{transform:none}
  .prose{max-width:none}
}
@media (max-width:600px){
  body{font-size:16px}
  .prose{font-size:16px}
  .tool-link--download{display:none}
  .subscribe-pill{right:12px;bottom:calc(14px + env(safe-area-inset-bottom))}
  .footer-meta{justify-content:flex-start}
  .media{border-radius:12px}
}

/* ================= 15. 偏好与无障碍 ================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .btn:hover,
  .card:hover,
  .subscribe-pill:hover,
  .footer-links a:hover{transform:none}
}