*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}

ul,ol{list-style:none;padding:0}

img,svg,video{max-width:100%;display:block}

a{color:inherit}

button{font:inherit;color:inherit;background:none;border:0}

:root{
  --paper:#F6F1E4;
  --salt:#FFFDF6;
  --ink:#221A14;
  --lake:#1F6F8B;
  --mist:#8FBDCB;
  --ochre:#BF4F26;
  --ochre-deep:#A2401D;
  --barley:#D9A62E;
  --saltgray:#8B8377;
  --night:#12333F;
  --wind:#6B4A32;
  --radius-lg:26px;
  --radius-md:18px;
  --radius-sm:12px;
  --shell:1280px;
  --gutter:clamp(20px,4vw,48px);
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Noto Sans Mono",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:140ms;
  --t-mid:200ms;
}

body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 8% 4%, rgba(143,189,203,.20), transparent 40%),
    radial-gradient(circle at 92% -6%, rgba(217,166,46,.13), transparent 36%),
    radial-gradient(rgba(34,26,20,.055) 1px, transparent 1.2px);
  background-size:auto,auto,4px 4px;
  background-attachment:fixed,fixed,scroll;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

main#main-content{flex:1 0 auto;display:block}

#main-content:focus{outline:2px solid var(--barley);outline-offset:6px}

[id]{scroll-margin-top:96px}

:focus-visible{outline:2px solid var(--barley);outline-offset:3px;border-radius:6px}

::selection{background:rgba(217,166,46,.4);color:var(--ink)}

/* ============ 通用排版 ============ */
h1,h2,h3,h4{font-weight:900;line-height:1.15;letter-spacing:.04em;color:var(--ink)}

.title-xl{font-size:clamp(30px,5.2vw,56px);line-height:1.15;letter-spacing:.04em;font-weight:900}

.title-lg{font-size:clamp(26px,3.4vw,34px);line-height:1.2;letter-spacing:.04em;font-weight:900}

.title-md{font-size:clamp(22px,2.4vw,24px);line-height:1.3;letter-spacing:.03em;font-weight:700}

.lede{font-size:17px;line-height:1.85;color:rgba(34,26,20,.84);max-width:62ch}

.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.18em;text-transform:uppercase;color:var(--lake);
}

.eyebrow::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--barley);flex:none}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}

.muted{color:var(--saltgray);font-size:13px;line-height:1.7}

.num-badge{
  font-family:var(--font-mono);font-weight:700;font-size:.86em;
  background:var(--barley);color:#2B1F07;
  padding:1px 8px;border-radius:6px;letter-spacing:.02em;
  display:inline-block;
}

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

.wrap-narrow{width:100%;max-width:680px;margin-inline:auto}

.section{padding-block:clamp(40px,6vw,84px)}

.section--tight{padding-block:clamp(28px,4vw,48px)}

.section--tint{background:rgba(255,253,246,.75);border-block:1px solid rgba(34,26,20,.1)}

.section--mist{background:linear-gradient(180deg,rgba(143,189,203,.24),rgba(143,189,203,.08));border-block:1px solid rgba(31,111,139,.18)}

.section--night{background:var(--night);color:rgba(246,241,228,.9);border-block:1px solid rgba(18,51,63,.6)}

.section--night h1,.section--night h2,.section--night h3{color:#FDF7E9}

.stack{display:grid;gap:16px}

.stack--lg{gap:28px}

.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* Bento 网格 */
.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:18px}

.bento-half{grid-column:span 6}

.bento-wide{grid-column:span 8}

.bento-thin{grid-column:span 4}

.bento-third{grid-column:span 4}

.bento-full{grid-column:1 / -1}

/* ============ 跳转链接 ============ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  transform:translateY(-180%);
  background:var(--ink);color:var(--salt);
  padding:10px 20px;border-radius:999px;
  font-size:14px;font-weight:700;text-decoration:none;
  transition:transform var(--t-fast) var(--ease);
}

.skip-link:focus{transform:translateY(0);outline:2px solid var(--barley);outline-offset:3px}

/* ============ 头部命令栏 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,#FFFDF6 0%,rgba(255,253,246,.96) 100%);
  border-bottom:1px solid rgba(34,26,20,.16);
  box-shadow:0 2px 0 rgba(246,241,228,.9);
  transition:box-shadow var(--t-mid) var(--ease);
}

.site-header[data-scrolled]{box-shadow:0 14px 30px -26px rgba(18,51,63,.85)}

.header-progress{
  position:absolute;inset:0 0 auto 0;height:3px;
  background:rgba(31,111,139,.12);
  overflow:hidden;
}

.progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--lake) 0%,var(--mist) 42%,var(--barley) 74%,var(--ochre) 100%);
  transition:transform 120ms linear;
}

.command-bar{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:"brand nav actions";
  align-items:center;
  gap:14px;
  width:100%;max-width:var(--shell);
  margin-inline:auto;
  padding:12px var(--gutter);
  min-height:74px;
  transition:min-height var(--t-mid) var(--ease),padding var(--t-mid) var(--ease);
}

.site-header[data-scrolled] .command-bar{min-height:56px;padding-block:7px}

/* 品牌 */
.brand-block{grid-area:brand;display:flex;align-items:center;gap:10px;min-width:0}

.brand-mark{
  display:inline-flex;align-items:center;gap:10px;
  text-decoration:none;color:var(--ink);
  transition:color var(--t-fast) var(--ease);
}

.brand-mark:hover{color:var(--lake)}

.brand-glyph{
  position:relative;width:26px;height:26px;flex:none;
  border-radius:9px;
  background:
    radial-gradient(circle at 50% 122%, var(--mist) 0 44%, transparent 45%),
    linear-gradient(158deg,var(--lake) 0%,var(--night) 100%);
  box-shadow:inset 0 0 0 1px rgba(255,253,246,.3);
}

.brand-glyph-dot{
  position:absolute;right:4px;bottom:5px;
  width:6px;height:6px;border-radius:50%;background:var(--barley);
}

.brand-name{font-size:19px;font-weight:900;letter-spacing:.1em;line-height:1}

.version-pill{
  display:inline-flex;align-items:center;gap:5px;
  background:var(--lake);color:var(--salt);
  border-radius:999px;padding:3px 10px;
  font-family:var(--font-mono);font-size:10.5px;font-weight:700;
  letter-spacing:.08em;white-space:nowrap;
}

.version-pill-label{opacity:.72}

.version-pill-num{color:#FCEFCB;font-variant-numeric:tabular-nums}

/* 主导航 */
.command-nav{grid-area:nav;justify-self:center;min-width:0}

.nav-list{display:flex;align-items:center;gap:2px}

.nav-item{display:block}

.nav-link{
  position:relative;
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 11px;border-radius:999px;
  font-size:14px;font-weight:600;line-height:1.2;
  color:rgba(34,26,20,.86);text-decoration:none;white-space:nowrap;
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);
}

.nav-index{
  font-family:var(--font-mono);font-size:10px;font-weight:700;
  letter-spacing:.02em;color:var(--lake);opacity:.8;
  transition:color var(--t-fast) var(--ease),opacity var(--t-fast) var(--ease);
}

.nav-link:hover{background:rgba(31,111,139,.11);color:var(--lake);transform:translateY(-1px)}

.nav-link:hover .nav-index{opacity:1}

.nav-link:active{transform:translateY(0)}

.nav-link[aria-current="page"]{
  background:var(--lake);color:var(--salt);
  box-shadow:inset 0 0 0 1px rgba(255,253,246,.22);
}

.nav-link[aria-current="page"] .nav-index{color:var(--barley);opacity:1}

.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:-8px;
  width:16px;height:2px;border-radius:2px;
  background:var(--ochre);transform:translateX(-50%);
}

/* 头部动作区 */
.header-actions{
  grid-area:actions;justify-self:end;
  display:flex;align-items:center;gap:8px;min-width:0;
}

.mini-link{
  font-size:12px;font-weight:600;color:var(--saltgray);
  text-decoration:none;padding:4px 2px;
  border-bottom:1px dashed rgba(139,131,119,.7);
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}

.mini-link:hover{color:var(--lake);border-bottom-color:var(--lake)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:999px;border:1.5px solid transparent;
  padding:12px 22px;
  font-family:inherit;font-size:14px;font-weight:700;letter-spacing:.03em;line-height:1.1;
  text-decoration:none;cursor:pointer;
  transition:transform var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}

.btn-sm{padding:8px 16px;font-size:13px}

.btn-solid{
  background:var(--ochre);color:#FFF6EC;
  box-shadow:0 6px 0 -3px rgba(107,74,50,.45);
}

.btn-solid:hover{background:var(--ochre-deep);transform:translateY(-2px);box-shadow:0 14px 22px -14px rgba(191,79,38,.85)}

.btn-outline{
  background:var(--salt);color:var(--ink);border-color:rgba(34,26,20,.62);
}

.btn-outline:hover{background:var(--ink);color:var(--salt);transform:translateY(-2px);border-color:var(--ink)}

.btn-ghost{
  background:rgba(31,111,139,.1);color:var(--lake);border-color:rgba(31,111,139,.28);
}

.btn-ghost:hover{background:var(--lake);color:var(--salt);border-color:var(--lake);transform:translateY(-2px)}

.btn:active{transform:translateY(0) scale(.985)}

.btn:focus-visible{outline:2px solid var(--barley);outline-offset:3px}

/* ============ 移动导航按钮 ============ */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 13px;border-radius:999px;
  border:1.5px solid rgba(34,26,20,.3);
  background:var(--salt);
  font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--ink);
  cursor:pointer;
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}

.nav-toggle:hover{background:rgba(31,111,139,.12);border-color:rgba(31,111,139,.5);color:var(--lake)}

.nav-toggle-bars{display:grid;gap:4px;width:14px}

.nav-toggle-bars i{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform var(--t-fast) var(--ease),opacity var(--t-fast) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child{transform:translateY(3px) rotate(45deg)}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child{transform:translateY(-3px) rotate(-45deg)}

.nav-toggle-text{white-space:nowrap}

/* ============ 通用组件 ============ */
.card{
  position:relative;
  background:var(--salt);
  border:1px solid rgba(34,26,20,.12);
  border-radius:var(--radius-lg);
  padding:clamp(18px,2.2vw,26px);
  transition:transform var(--t-mid) var(--ease),box-shadow var(--t-mid) var(--ease),border-color var(--t-mid) var(--ease);
}

.card:hover,.card:focus-within{
  transform:translateY(-2px);
  box-shadow:0 16px 34px -26px rgba(18,51,63,.8);
  border-color:rgba(31,111,139,.45);
}

.card-title{font-size:19px;font-weight:700;letter-spacing:.02em;line-height:1.35;transition:color var(--t-fast) var(--ease)}

.card-title a{text-decoration:none;color:inherit}

.card:hover .card-title,.card:focus-within .card-title{color:var(--lake)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  border-radius:999px;padding:4px 11px;
  font-size:12px;font-weight:600;letter-spacing:.03em;
  background:rgba(31,111,139,.12);color:var(--lake);
  border:1px solid rgba(31,111,139,.24);
}

.tag-gold{background:rgba(217,166,46,.2);color:#7A5A0F;border-color:rgba(217,166,46,.45)}

.tag-ochre{background:rgba(191,79,38,.13);color:var(--ochre-deep);border-color:rgba(191,79,38,.32)}

.tag-gray{background:rgba(139,131,119,.14);color:#5C5449;border-color:rgba(139,131,119,.34)}

.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:700;font-size:14px;color:var(--lake);text-decoration:none;
  border-bottom:1.5px solid rgba(31,111,139,.34);
  padding-bottom:2px;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),gap var(--t-fast) var(--ease);
}

.link-arrow::after{content:"→";font-family:var(--font-mono);line-height:1}

.link-arrow:hover{color:var(--ochre);border-color:rgba(191,79,38,.55);gap:12px}

.breadcrumbs{font-size:13px;color:var(--saltgray);letter-spacing:.02em}

.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}

.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}

.breadcrumbs li+li::before{content:"›";color:var(--mist);font-family:var(--font-mono)}

.breadcrumbs a{text-decoration:none;color:rgba(34,26,20,.72);border-bottom:1px solid transparent;transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease)}

.breadcrumbs a:hover{color:var(--lake);border-bottom-color:var(--lake)}

.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:700}

.divider-wave{
  height:14px;border:0;margin:0;width:100%;
  background-image:radial-gradient(circle at 14px 0,transparent 12.5px,rgba(31,111,139,.28) 13px,transparent 14px);
  background-size:28px 14px;
  background-repeat:repeat-x;
}

/* 图片容器基础规则（页面阶段放置占位图） */
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(255,253,246,.96),rgba(143,189,203,.28));
  border:1px solid rgba(34,26,20,.12);
  box-shadow:0 20px 42px -34px rgba(18,51,63,.85);
  width:100%;
}

.media-frame img,.media-frame svg{width:100%;height:100%;object-fit:cover;display:block}

.media-wide{aspect-ratio:16/9}

.media-tall{aspect-ratio:3/4}

.media-square{aspect-ratio:1/1}

.media-frame.is-placeholder::after{
  content:attr(data-label);
  position:absolute;inset:auto 0 0 0;
  padding:10px 16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:rgba(34,26,20,.55);
  background:linear-gradient(180deg,transparent,rgba(255,253,246,.86));
  text-align:left;
}

.media-frame.is-placeholder::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(45deg,rgba(31,111,139,.1) 25%,transparent 25%,transparent 50%,rgba(31,111,139,.1) 50%,rgba(31,111,139,.1) 75%,transparent 75%);
  background-size:26px 26px;
  opacity:.7;
}

.device-frame{
  padding:10px;
  border-radius:30px;
  background:linear-gradient(180deg,#FFFDF6,#EFE7D6);
  border:1px solid rgba(34,26,20,.18);
  box-shadow:0 24px 48px -36px rgba(18,51,63,.9);
}

.device-frame .media-frame{border-radius:22px;box-shadow:none}

/* 显现动效 */
.has-js [data-reveal]{opacity:0;transform:translateY(10px);transition:opacity 320ms var(--ease),transform 320ms var(--ease)}

.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 页脚 ============ */
.site-footer{position:relative;background:var(--night);color:rgba(246,241,228,.86);margin-top:auto}

.footer-band{
  height:18px;
  background-color:var(--night);
  background-image:radial-gradient(circle at 50% 0,var(--paper) 0 58%,transparent 60%);
  background-size:36px 36px;
  background-repeat:repeat-x;
  background-position:center top;
}

.footer-inner{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:clamp(30px,4.5vw,54px) var(--gutter) 0;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.15fr 1.35fr;
  gap:34px 40px;
  align-items:start;
}

.footer-col{min-width:0}

.footer-mark{
  display:inline-block;text-decoration:none;
  font-size:22px;font-weight:900;letter-spacing:.12em;line-height:1.2;
  color:#FDF7E9;
  transition:color var(--t-fast) var(--ease);
}

.footer-mark:hover{color:var(--barley)}

.footer-tagline{
  margin-top:14px;max-width:30ch;
  font-size:14px;line-height:1.75;color:rgba(246,241,228,.7);
}

.footer-legal{
  margin-top:16px;font-size:12px;letter-spacing:.04em;
  color:rgba(246,241,228,.5);
}

.footer-legal .mono{color:rgba(143,189,203,.9)}

.footer-title{
  display:flex;align-items:center;gap:8px;
  font-size:11.5px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:var(--barley);margin-bottom:16px;
}

.footer-title::before{content:"";width:14px;height:2px;border-radius:2px;background:var(--ochre);flex:none}

.footer-list{display:grid;gap:10px;font-size:14px;line-height:1.6}

.footer-list a{
  display:inline-block;text-decoration:none;
  color:rgba(246,241,228,.82);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);
}

.footer-list a:hover{color:var(--barley);border-bottom-color:rgba(217,166,46,.7);transform:translateY(-1px)}

.footer-contact{gap:14px}

.footer-contact li{display:grid;gap:3px}

.footer-label{
  font-family:var(--font-mono);font-size:10.5px;font-weight:700;
  letter-spacing:.18em;text-transform:uppercase;color:rgba(143,189,203,.85);
}

.footer-value{color:rgba(246,241,228,.86);font-size:13.5px;line-height:1.65;word-break:break-word}

.footer-bottom{
  margin-top:clamp(26px,3.5vw,40px);
  border-top:1px solid rgba(246,241,228,.16);
  padding-block:18px 26px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  font-size:12.5px;color:rgba(246,241,228,.6);
}

.footer-copy{letter-spacing:.02em}

.footer-copy .mono{color:rgba(246,241,228,.8)}

.footer-legal-links{display:flex;flex-wrap:wrap;gap:20px}

.footer-legal-links a{
  text-decoration:none;color:rgba(246,241,228,.72);
  border-bottom:1px solid rgba(246,241,228,.22);
  padding-bottom:1px;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}

.footer-legal-links a:hover{color:var(--barley);border-bottom-color:var(--barley)}

/* ============ 响应式 ============ */
@media (max-width:1120px){
  .command-bar{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:
      "brand actions"
      "nav nav";
    gap:8px 12px;
    padding-block:10px;
    min-height:0;
  }

  .site-header[data-scrolled] .command-bar{padding-block:8px}

  .brand-name{font-size:17px}

  .mini-link{display:none}

  .nav-toggle{display:inline-flex}

  .command-nav{
    display:none;
    width:100%;
    margin-top:2px;
    padding-top:8px;
    border-top:1px dashed rgba(34,26,20,.18);
    overflow-x:auto;
    overflow-y:hidden;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:thin;
  }

  .site-header[data-open] .command-nav{display:block}

  .nav-list{
    width:max-content;
    min-width:100%;
    gap:6px;
    padding-bottom:6px;
  }

  .nav-link{padding:8px 12px;font-size:13.5px;background:rgba(31,111,139,.06)}

  .nav-link[aria-current="page"]::after{bottom:-2px}

  .bento-half,.bento-wide,.bento-thin,.bento-third{grid-column:span 6}
}

@media (max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px 28px}
  .footer-brand{grid-column:1 / -1}
  .footer-tagline{max-width:46ch}
}

@media (max-width:620px){
  body{font-size:15.5px}
  .brand-name{font-size:16px;letter-spacing:.08em}
  .version-pill{display:none}
  .btn-sm{padding:7px 13px;font-size:12.5px}
  .nav-toggle{padding:7px 11px;font-size:12.5px}
  .header-actions{gap:6px}
  .bento{grid-template-columns:repeat(6,minmax(0,1fr));gap:14px}
  .bento-half,.bento-wide,.bento-thin,.bento-third,.bento-full{grid-column:1 / -1}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .card{border-radius:var(--radius-md)}
  .media-frame{border-radius:var(--radius-md)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:120ms !important;
    transition-property:opacity,color,background-color,border-color !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .card:hover,.card:focus-within,.btn:hover,.nav-link:hover,.footer-list a:hover{transform:none}
}