/* =========================================================
   安信主页 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================= */

:root{
  --ink:#0A2A43;
  --ink-soft:#123c5c;
  --night:#2B2A5C;
  --spark:#17C3B2;
  --celadon:#57A79A;
  --gold:#E3A93F;
  --sand:#F3F1EA;
  --mist:#CFE7E3;
  --graphite:#263238;
  --slate:#6B8494;
  --dune:#E7E1D4;

  --line:rgba(10,42,67,.14);
  --line-strong:rgba(10,42,67,.28);
  --grid-line:rgba(10,42,67,.045);

  --radius-lg:26px 10px 26px 10px;
  --radius-md:18px 7px 18px 7px;
  --radius-sm:12px 4px 12px 4px;

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,monospace;

  --wrap:1240px;
  --gutter:clamp(18px,4vw,44px);
  --nav-break:960px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  min-height:100vh;
  color:var(--graphite);
  background-color:var(--sand);
  background-image:
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px),
    linear-gradient(180deg,var(--grid-line) 1px,transparent 1px);
  background-size:76px 76px,76px 76px;
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg,video,picture,canvas{display:block;max-width:100%;}
ul,ol{margin:0;padding:0;list-style:none;}
p{margin:0 0 1.2em;}
p:last-child{margin-bottom:0;}
h1,h2,h3,h4,h5{
  margin:0 0 .5em;
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.2;
  letter-spacing:-.015em;
  color:var(--ink);
}
h1{font-size:clamp(34px,6vw,68px);}
h2{font-size:clamp(26px,3.4vw,40px);}
h3{font-size:clamp(19px,2.1vw,24px);}
a{color:inherit;text-decoration:none;}
strong{font-weight:700;color:var(--ink);}
code,kbd,samp,time{font-family:var(--font-mono);}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--spark);outline-offset:3px;border-radius:4px;}

/* ---------- 左侧蓝图细线（桌面） ---------- */
@media (min-width:1080px){
  body::before{
    content:"";
    position:fixed;
    top:0;
    bottom:0;
    left:max(0px,calc((100vw - var(--wrap)) / 2 - 30px));
    width:1px;
    background:linear-gradient(180deg,rgba(23,195,178,.55),rgba(10,42,67,.18) 38%,rgba(10,42,67,.04));
    pointer-events:none;
    z-index:4;
  }
}

/* ---------- 跳至主内容 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-70px;
  z-index:200;
  display:inline-block;
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  color:var(--ink);
  background:var(--spark);
  border-radius:var(--radius-sm);
  box-shadow:0 10px 22px rgba(10,42,67,.24);
  transition:top .18s ease;
}
.skip-link:focus{top:16px;}

/* ---------- 通用容器 ---------- */
.shell{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding:clamp(38px,6vw,86px) 0;}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 28px;
  margin-bottom:clamp(20px,3vw,38px);
}
.section__title{font-size:clamp(26px,3.4vw,40px);margin:0;}
.section__note{margin:0;max-width:46ch;font-size:14.5px;color:var(--slate);}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--celadon);
  text-transform:uppercase;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;}
.lede{
  max-width:60ch;
  font-size:clamp(16px,1.6vw,19px);
  line-height:1.8;
  color:#33474f;
}
.annot{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--slate);
}
.note-vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--slate);
}
.rule-h{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,var(--line-strong),rgba(10,42,67,.02));
}
.trust-line{
  margin:clamp(24px,3vw,40px) 0 0;
  padding-top:14px;
  border-top:1px dashed var(--line-strong);
  font-size:13px;
  color:var(--slate);
}
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* =========================================================
   头部：框架式导航
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  color:var(--mist);
  background:linear-gradient(180deg,var(--ink) 0%,#0d3350 100%);
  border-bottom:1px solid rgba(23,195,178,.28);
  transition:box-shadow .22s ease;
}
.site-header.is-condensed{box-shadow:0 14px 34px rgba(10,42,67,.26);}

.header-rail{
  display:flex;
  align-items:center;
  gap:18px;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:9px var(--gutter) 8px;
  max-height:44px;
  overflow:hidden;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:rgba(207,231,227,.72);
  border-bottom:1px solid rgba(23,195,178,.18);
  transition:max-height .24s ease,opacity .24s ease,padding .24s ease,border-color .24s ease;
}
.header-rail__coord{white-space:nowrap;}
.header-rail__note{white-space:nowrap;}
.header-rail__scale{
  flex:1 1 auto;
  height:6px;
  min-width:40px;
  background-image:repeating-linear-gradient(90deg,rgba(23,195,178,.45) 0 1px,transparent 1px 14px);
}
.site-header.is-condensed .header-rail{
  max-height:0;
  opacity:0;
  padding-top:0;
  padding-bottom:0;
  border-bottom-color:transparent;
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(14px,2vw,32px);
  max-width:var(--wrap);
  margin-inline:auto;
  padding:12px var(--gutter);
  min-height:74px;
}

.header-brand{display:flex;align-items:center;gap:14px;min-width:0;}
.brand-mark{display:flex;align-items:center;gap:12px;min-width:0;}
.brand-mark__glyph{
  display:grid;
  place-items:center;
  width:42px;height:42px;
  flex:none;
  font-family:var(--font-head);
  font-size:21px;
  font-weight:900;
  color:var(--ink);
  background:linear-gradient(140deg,var(--spark),#7fe3d7);
  border-radius:14px 5px 14px 5px;
  box-shadow:0 6px 18px rgba(23,195,178,.3);
}
.brand-mark__text{display:flex;flex-direction:column;line-height:1.15;min-width:0;}
.brand-mark__name{
  font-family:var(--font-head);
  font-size:19px;
  font-weight:900;
  letter-spacing:.02em;
  color:#fff;
}
.brand-mark__sub{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:rgba(207,231,227,.72);
}
.brand-index{
  padding-left:14px;
  border-left:1px solid rgba(207,231,227,.22);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(207,231,227,.6);
  white-space:nowrap;
}

/* 移动端按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  border:1px solid rgba(23,195,178,.5);
  border-radius:var(--radius-sm);
  transition:background-color .18s ease,border-color .18s ease;
}
.nav-toggle:hover{background:rgba(23,195,178,.12);border-color:var(--spark);}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px;flex:none;}
.nav-toggle__bars i{
  display:block;
  height:2px;
  background:var(--spark);
  border-radius:2px;
  transition:transform .2s 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);}

/* 导航 */
.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
}
.site-nav__list{display:flex;align-items:center;gap:clamp(2px,.6vw,8px);}
.site-nav__link{
  position:relative;
  display:block;
  padding:10px 12px;
  font-size:14.5px;
  font-weight:600;
  color:rgba(243,241,234,.82);
  border:1px solid transparent;
  border-radius:10px 3px 10px 3px;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:4px;
  height:1px;
  background:var(--spark);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .2s ease;
}
.site-nav__link:hover{
  color:#fff;
  border-color:rgba(23,195,178,.45);
  background:rgba(23,195,178,.08);
}
.site-nav__link:hover::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{
  color:#fff;
  border-color:var(--spark);
  background:rgba(23,195,178,.14);
}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);}

.frame-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 19px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  color:#231a06;
  background:linear-gradient(120deg,var(--gold),#f0c169);
  border-radius:16px 5px 16px 5px;
  box-shadow:0 8px 20px rgba(227,169,63,.26);
  transition:transform .18s ease,box-shadow .18s ease;
}
.frame-cta::after{content:"→";font-family:var(--font-mono);}
.frame-cta:hover{transform:translateY(-2px);box-shadow:0 13px 26px rgba(227,169,63,.34);}

.header-rule{height:2px;background:rgba(23,195,178,.16);}
.header-rule__fill{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--spark),var(--gold));
  transition:width .1s linear;
}

/* =========================================================
   页脚：轻量标签行
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(30px,5vw,70px);
  background:linear-gradient(180deg,#EFEBE1 0%,var(--dune) 100%);
  border-top:1px solid var(--line-strong);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:76px;height:2px;
  background:linear-gradient(90deg,var(--spark),var(--celadon));
}
.footer-inner{
  display:flex;
  flex-direction:column;
  gap:16px;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(26px,4vw,44px) var(--gutter) clamp(32px,4vw,50px);
}
.footer-brand{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px;}
.footer-brand__mark{
  font-family:var(--font-head);
  font-size:18px;
  font-weight:900;
  color:var(--ink);
}
.footer-brand__note{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--slate);
}
.footer-tags{display:flex;flex-wrap:wrap;gap:10px;}
.footer-tag{
  display:inline-flex;
  align-items:center;
  padding:5px 12px;
  font-size:12.5px;
  font-weight:600;
  color:var(--ink);
  background:rgba(255,255,255,.66);
  border:1px solid var(--line);
  border-radius:11px 4px 11px 4px;
}
.footer-tag--icp{font-family:var(--font-mono);letter-spacing:.06em;color:#3b4a51;}
.footer-contact{
  display:flex;
  flex-wrap:wrap;
  gap:8px 28px;
  font-size:14px;
  color:#3b4a51;
}
.footer-contact__item{display:inline-flex;align-items:baseline;gap:8px;}
.footer-contact__key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--slate);
}
.footer-links{display:flex;flex-wrap:wrap;gap:10px;}
.footer-links a{
  padding:7px 14px;
  font-size:13.5px;
  font-weight:600;
  color:var(--ink);
  border:1px solid var(--line-strong);
  border-radius:13px 4px 13px 4px;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.footer-links a:hover{background:var(--mist);border-color:var(--spark);}
.footer-meta{
  margin:0;
  padding-top:12px;
  border-top:1px dashed var(--line-strong);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--slate);
}

/* =========================================================
   通用组件
   ========================================================= */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 22px;
  font-size:15px;
  font-weight:700;
  border:1px solid transparent;
  border-radius:var(--radius-md);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{background:var(--ink);color:#fff;}
.btn--primary:hover{background:var(--ink-soft);transform:translateY(-2px);box-shadow:0 14px 26px rgba(10,42,67,.24);}
.btn--gold{background:var(--gold);color:#231a06;}
.btn--gold:hover{transform:translateY(-2px);box-shadow:0 14px 26px rgba(227,169,63,.3);}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--ink);}
.btn--ghost:hover{border-color:var(--spark);background:var(--mist);}
.btn--spark{background:var(--spark);color:var(--ink);}
.btn--spark:hover{transform:translateY(-2px);box-shadow:0 14px 26px rgba(23,195,178,.3);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 13px;
  font-size:13px;
  font-weight:600;
  color:var(--ink);
  background:var(--mist);
  border:1px solid rgba(10,42,67,.1);
  border-radius:12px 4px 12px 4px;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.tag--spark{background:rgba(23,195,178,.16);border-color:rgba(23,195,178,.5);color:#0b4a45;}
.tag--gold{background:rgba(227,169,63,.18);border-color:rgba(227,169,63,.55);color:#6b4a09;}
.tag--quiet{background:transparent;border-color:var(--line-strong);color:var(--slate);}
a.tag:hover{background:var(--spark);border-color:var(--spark);color:var(--ink);}

.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:clamp(18px,2.2vw,26px);
  background:linear-gradient(160deg,#fff 0%,#FBFAF6 100%);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{transform:translateY(-3px);border-color:rgba(23,195,178,.45);box-shadow:0 18px 34px rgba(10,42,67,.12);}
.card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--slate);}
.card__title{font-size:clamp(19px,2vw,23px);margin:0;}
.card__text{margin:0;font-size:15px;color:#3b4a51;}
.card--dark{
  background:linear-gradient(150deg,var(--ink) 0%,var(--ink-soft) 100%);
  border-color:rgba(23,195,178,.26);
  color:var(--mist);
}
.card--dark .card__title{color:#fff;}
.card--dark .card__text{color:rgba(207,231,227,.86);}
.card--dark .card__meta{color:rgba(207,231,227,.7);}

.grid{display:grid;gap:clamp(16px,2vw,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));}
@media (min-width:901px){
  .grid--stagger>*:nth-child(3n+2){margin-top:clamp(18px,3vw,44px);}
  .grid--stagger>*:nth-child(3n+3){margin-top:clamp(8px,1.4vw,20px);}
}

.panel{
  padding:clamp(20px,3vw,40px);
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
}
.panel--mist{background:linear-gradient(150deg,var(--mist) 0%,#E6F2EF 100%);border-color:rgba(23,195,178,.3);}
.panel--night{
  background:linear-gradient(150deg,var(--night) 0%,var(--ink) 100%);
  border-color:rgba(23,195,178,.26);
  color:var(--mist);
}
.panel--night h2,.panel--night h3,.panel--night h4{color:#fff;}
.panel--grid{
  background-image:
    linear-gradient(90deg,rgba(10,42,67,.06) 1px,transparent 1px),
    linear-gradient(180deg,rgba(10,42,67,.06) 1px,transparent 1px);
  background-size:44px 44px,44px 44px;
}

/* 图像容器基类：页面阶段放入内联 SVG 或 <img> */
.media{
  position:relative;
  overflow:hidden;
  width:100%;
  background:linear-gradient(150deg,var(--mist) 0%,var(--dune) 100%);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
}
.media>img,.media>svg,.media>picture,.media>video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--16x9{aspect-ratio:16/9;}
.media--4x3{aspect-ratio:4/3;}
.media--1x1{aspect-ratio:1/1;}
.media--tall{aspect-ratio:3/4;}
.media__cap{
  position:absolute;
  left:12px;
  bottom:11px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--ink);
  background:rgba(243,241,234,.88);
  border-radius:8px 3px 8px 3px;
}
.media__slot{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-align:center;
  color:rgba(10,42,67,.42);
}
.media--shadow{box-shadow:0 18px 40px rgba(10,42,67,.14);}

/* 面包屑 */
.crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:22px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--slate);
}
.crumb li{display:flex;align-items:center;gap:8px;}
.crumb li+li::before{content:"/";color:rgba(107,132,148,.6);}
.crumb a:hover{color:var(--ink);}
.crumb [aria-current="page"]{color:var(--ink);}

/* 进入视口点亮 */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s ease,transform .5s ease;
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none;}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1180px){
  .brand-index{display:none;}
}
@media (max-width:1080px){
  .site-nav__link{padding:9px 9px;}
}
@media (max-width:960px){
  .nav-toggle{display:inline-flex;}
  .header-inner{min-height:64px;padding:10px var(--gutter);}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    max-height:calc(100vh - 64px);
    overflow-y:auto;
    padding:16px var(--gutter) 22px;
    background:linear-gradient(180deg,#0d3350 0%,var(--night) 100%);
    border-bottom:1px solid rgba(23,195,178,.35);
    box-shadow:0 26px 44px rgba(10,42,67,.34);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0);}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:2px;}
  .site-nav__link{padding:13px 14px;font-size:16px;border-color:rgba(207,231,227,.14);}
  .site-nav__link[aria-current="page"]{border-color:var(--spark);}
  .frame-cta{justify-content:center;margin-top:10px;padding:14px 20px;}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:720px){
  body{font-size:16px;}
  .header-rail__note{display:none;}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr);}
  .grid--stagger>*{margin-top:0!important;}
  .footer-contact{flex-direction:column;gap:6px;}
}
@media (max-width:420px){
  .nav-toggle__label{display:none;}
}

/* =========================================================
   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 [data-reveal],
  .js-reveal [data-reveal].is-visible{
    opacity:1!important;
    transform:none!important;
  }
  .card:hover,.btn:hover,.frame-cta:hover{transform:none;}
}