/* ==========================================================
   安信官网 · 共享样式 /assets/site.css
   1 设计令牌 · 2 重置与中文排版 · 3 布局工具 · 4 共享组件
   5 页头 · 6 页脚 · 7 响应式与动效降级
   ========================================================== */

/* 1 设计令牌 */
:root{
  --deep:#0B2A4A;
  --deep-2:#08213A;
  --blue:#145DA0;
  --teal:#2E7F8F;
  --slate:#6B8794;
  --mist:#DCE8F2;
  --sand:#E8D9BF;
  --amber:#F2A93B;
  --green:#2F7D5B;
  --ink:#1C2A33;
  --paper:#F7F8F5;

  --font-head:"Helvetica Neue","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:"SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --radius-pill:999px;
  --radius-lg:26px;
  --radius-md:18px;
  --radius-sm:12px;

  --line:rgba(28,42,51,.12);
  --wrap:1180px;
  --gutter:clamp(16px,4vw,40px);
  --shadow-card:0 16px 34px -30px rgba(11,42,74,.7);
}

/* 2 重置与中文排版 */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
main{display:block}
img,svg,video{max-width:100%;display:block}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,h6{
  margin:0 0 .55em;
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.01em;
  color:var(--deep);
  text-wrap:balance;
}
h1{font-size:clamp(2.2rem,5vw,3.4rem);letter-spacing:-.02em}
h2{font-size:clamp(1.55rem,2.8vw,2.1rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.35rem);letter-spacing:0}
p{margin:0 0 1em}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--teal)}
strong{font-weight:700}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px;border-radius:6px}

/* 3 布局工具 */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.wrap--narrow{max-width:860px}
.section{padding:clamp(32px,5vw,64px) 0}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px;margin-bottom:clamp(18px,3vw,30px);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 10px;
  font-family:var(--font-mono);font-size:.74rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--teal);
}
.eyebrow::before{content:"";width:22px;height:2px;border-radius:2px;background:var(--amber)}
.grid{display:grid;gap:clamp(16px,2.6vw,28px)}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.divider{border:0;height:1px;margin:clamp(24px,4vw,40px) 0;background:linear-gradient(90deg,rgba(20,93,160,.35),rgba(20,93,160,.04))}
.text-muted{color:var(--slate)}

/* 4 共享组件 */
.skip-link{
  position:fixed;top:-90px;left:50%;transform:translateX(-50%);
  z-index:200;padding:11px 22px;border-radius:0 0 16px 16px;
  background:var(--deep);color:var(--paper);font-weight:700;font-size:.9rem;
  text-decoration:none;transition:top .2s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:0;color:var(--paper);outline:3px solid var(--amber);outline-offset:2px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border:1px solid transparent;border-radius:var(--radius-pill);
  font-family:var(--font-head);font-size:.88rem;font-weight:700;letter-spacing:.03em;
  text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:transform .18s ease,background-color .18s ease,box-shadow .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--amber);color:#1B2733;box-shadow:0 12px 22px -14px rgba(242,169,59,.95)}
.btn-primary:hover{background:#FFB84D;color:#1B2733}
.btn-quiet{background:rgba(255,255,255,.08);border-color:rgba(247,248,245,.4);color:var(--paper)}
.btn-quiet:hover{background:rgba(255,255,255,.18);color:var(--paper)}
.btn-outline{background:transparent;border-color:rgba(20,93,160,.4);color:var(--blue)}
.btn-outline:hover{background:rgba(20,93,160,.08);color:var(--deep)}

.exhibit-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 13px 5px 11px;border-radius:var(--radius-pill);
  background:var(--sand);color:#3B3222;
  font-family:var(--font-head);font-size:.76rem;font-weight:700;letter-spacing:.06em;
}
.exhibit-tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--amber)}

.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(20,93,160,.28);background:#fff;color:var(--blue);
  font-size:.84rem;font-weight:600;line-height:1.4;cursor:pointer;text-decoration:none;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.chip:hover{background:var(--mist);border-color:rgba(20,93,160,.45);color:var(--deep)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--blue);border-color:var(--blue);color:var(--paper)}

.card{
  min-width:0;padding:clamp(18px,2.4vw,26px);
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);
  box-shadow:var(--shadow-card);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{transform:translateY(-3px);border-color:rgba(20,93,160,.35);box-shadow:0 26px 48px -32px rgba(11,42,74,.75)}
.card-title{margin:0 0 8px;font-family:var(--font-head);font-size:1.06rem;font-weight:800;line-height:1.35;color:var(--deep)}
.card-text{margin:0;font-size:.92rem;line-height:1.72;color:rgba(28,42,51,.78)}
.card-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;
  margin:14px 0 0;font-family:var(--font-mono);font-size:.74rem;
  letter-spacing:.04em;color:var(--teal);
}

.media-frame{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius-lg);aspect-ratio:16/10;
  background:linear-gradient(135deg,var(--mist) 0%,#E4EFF5 46%,var(--sand) 100%);
  box-shadow:inset 0 0 0 1px rgba(11,42,74,.08);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame:empty::after{content:"";position:absolute;inset:16px;border-radius:16px;border:1px dashed rgba(11,42,74,.22)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}

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

.prose{max-width:68ch;font-size:1rem;line-height:1.85;color:rgba(28,42,51,.88)}
.prose p{margin:0 0 1.1em}
.prose h2,.prose h3{margin-top:1.8em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em;list-style:disc}
.prose li{margin:0 0 .45em}

.breadcrumbs{margin:0 0 clamp(16px,2.6vw,26px)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:0;font-size:.8rem;color:var(--slate)}
.breadcrumb-list li{display:flex;align-items:center}
.breadcrumb-list li+li::before{content:"/";margin:0 8px;color:rgba(107,135,148,.55)}
.breadcrumb-link{color:var(--teal)}
.breadcrumb-link:hover{color:var(--blue);text-decoration:underline}
.breadcrumb-current{color:var(--ink);font-weight:600}

[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .6s cubic-bezier(.22,.61,.36,1),transform .6s cubic-bezier(.22,.61,.36,1);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-in{opacity:1;transform:none}

/* 5 页头 */
.site-header{
  position:sticky;top:0;z-index:80;
  padding:14px var(--gutter) 22px;
  background:linear-gradient(180deg,rgba(247,248,245,.97) 0%,rgba(247,248,245,.9) 58%,rgba(247,248,245,0) 100%);
}
.header-meter{position:fixed;top:0;left:0;right:0;height:3px;z-index:90;pointer-events:none;background:rgba(11,42,74,.09)}
.header-meter-bar{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--blue) 0%,var(--teal) 55%,var(--amber) 100%);
  transition:transform .12s linear;
}
.header-inner{
  position:relative;display:flex;align-items:center;gap:18px;
  max-width:var(--wrap);margin:0 auto;padding:9px 10px 9px 16px;
  border-radius:var(--radius-pill);color:var(--paper);
  background:linear-gradient(118deg,#0B2A4A 0%,#10395F 52%,#145DA0 100%);
  box-shadow:0 22px 46px -28px rgba(11,42,74,.9),inset 0 0 0 1px rgba(255,255,255,.1);
}
.brand{
  display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:4px 8px 4px 4px;border-radius:var(--radius-pill);
  color:var(--paper);text-decoration:none;
}
.brand:hover{color:var(--paper)}
.brand-mark{
  display:flex;flex-direction:column;justify-content:center;gap:3px;flex:0 0 auto;
  width:34px;height:34px;padding:0 8px;border-radius:11px;
  background:linear-gradient(150deg,var(--teal) 0%,var(--deep) 74%);
  box-shadow:inset 0 0 0 1px rgba(232,217,191,.35);
  transition:transform .2s ease;
}
.brand:hover .brand-mark{transform:rotate(-4deg)}
.brand-mark-line{display:block;height:2.5px;border-radius:2px;background:var(--sand)}
.brand-mark-line--short{width:58%;background:var(--amber)}
.brand-text{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand-name{font-family:var(--font-head);font-size:1rem;font-weight:800;letter-spacing:.05em}
.brand-tag{font-size:.66rem;letter-spacing:.14em;color:rgba(232,217,191,.86);white-space:nowrap}

.header-panel{display:flex;align-items:center;gap:14px;margin-left:auto;min-width:0}
.site-nav{min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-item{display:flex}
.nav-link{
  position:relative;display:inline-block;padding:9px 13px;border-radius:var(--radius-pill);
  font-family:var(--font-body);font-size:.92rem;font-weight:500;white-space:nowrap;
  color:rgba(247,248,245,.76);text-decoration:none;
  transition:color .18s ease,background-color .18s ease;
}
.nav-link:hover{color:var(--paper);background:rgba(255,255,255,.1)}
.nav-link[aria-current="page"]{color:#fff;background:rgba(255,255,255,.13)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:3px;width:16px;height:2px;border-radius:2px;
  background:var(--amber);transform:translateX(-50%);
}
.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(247,248,245,.4);background:rgba(255,255,255,.08);
  color:var(--paper);font-family:var(--font-head);font-size:.8rem;font-weight:700;
  letter-spacing:.12em;cursor:pointer;
}
.nav-toggle:hover{background:rgba(255,255,255,.16)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:2px;border-radius:2px;background:var(--amber);transition:transform .2s ease}
.site-header[data-open] .nav-toggle-bars span:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

/* 6 页脚 */
.site-footer{
  position:relative;margin-top:clamp(48px,8vw,96px);
  padding:clamp(40px,6vw,66px) 0 26px;
  color:var(--mist);
  background:
    radial-gradient(circle at 1px 1px,rgba(220,232,242,.11) 1px,transparent 1px) 0 0/20px 20px,
    linear-gradient(175deg,#0B2A4A 0%,#08213A 58%,#061829 100%);
}
.footer-inner{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.footer-top{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.85fr);
  gap:clamp(28px,4vw,56px);align-items:start;
}
.footer-brand{min-width:0}
.footer-brand-line{
  display:flex;align-items:center;gap:10px;margin:0 0 12px;
  font-family:var(--font-head);font-size:1.25rem;font-weight:800;letter-spacing:.05em;color:var(--paper);
}
.brand-mark--footer{width:30px;height:30px;border-radius:10px;padding:0 7px;background:linear-gradient(150deg,var(--teal) 0%,#0B2A4A 76%)}
.footer-about{margin:0 0 18px;max-width:34ch;font-size:.92rem;line-height:1.75;color:rgba(220,232,242,.78)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:clamp(20px,3vw,36px)}
.footer-col{min-width:0}
.footer-heading{
  margin:0 0 12px;font-family:var(--font-head);font-size:.74rem;font-weight:800;
  letter-spacing:.2em;color:var(--sand);
}
.footer-list{display:flex;flex-direction:column;gap:9px;font-size:.9rem}
.footer-link{
  color:rgba(220,232,242,.82);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease;
}
.footer-link:hover{color:var(--paper);border-bottom-color:var(--amber)}
.footer-contact{display:flex;flex-direction:column;gap:12px;font-size:.88rem}
.footer-contact-item{display:flex;flex-direction:column;gap:3px}
.footer-contact-label{font-size:.7rem;letter-spacing:.16em;color:rgba(232,217,191,.75)}
.footer-contact-value{font-family:var(--font-mono);font-size:.84rem;line-height:1.6;color:var(--paper);word-break:break-word}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 26px;
  margin-top:clamp(28px,4vw,44px);padding-top:20px;
  border-top:1px solid rgba(220,232,242,.16);
  font-size:.8rem;color:rgba(220,232,242,.7);
}
.footer-note{flex:1 1 320px;max-width:62ch;margin:0;line-height:1.65}
.footer-legal{display:flex;flex-wrap:wrap;gap:6px 18px}
.footer-legal-link{
  color:rgba(220,232,242,.82);text-decoration:none;
  border-bottom:1px dashed rgba(220,232,242,.35);
  transition:color .18s ease,border-color .18s ease;
}
.footer-legal-link:hover{color:var(--paper);border-bottom-color:var(--amber)}
.footer-icp{margin:0;font-family:var(--font-mono);font-size:.76rem;color:rgba(220,232,242,.62)}
.footer-copy{margin:0;font-size:.76rem;color:rgba(220,232,242,.55)}

/* 7 响应式 */
@media (max-width:1180px){
  .brand-tag{display:none}
}
@media (max-width:1080px){
  .nav-link{padding:8px 9px;font-size:.85rem}
  .header-actions .btn-quiet{display:none}
  .footer-top{grid-template-columns:1fr}
}
@media (max-width:1023px){
  .site-header{padding:10px var(--gutter) 18px}
  .header-inner{flex-wrap:wrap;padding:8px 10px 8px 12px;border-radius:22px}
  .nav-toggle{display:inline-flex}
  .header-panel{
    display:none;position:absolute;top:calc(100% + 12px);left:0;right:0;
    margin-left:0;flex-direction:column;align-items:stretch;gap:14px;
    padding:16px;border-radius:24px;
    background:linear-gradient(160deg,#0B2A4A 0%,#123F68 58%,#145DA0 100%);
    box-shadow:0 34px 60px -32px rgba(11,42,74,.95),inset 0 0 0 1px rgba(255,255,255,.12);
  }
  .site-header[data-open] .header-panel{display:flex}
  .site-nav{width:100%}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-item{width:100%}
  .nav-link{display:block;width:100%;padding:12px 14px;font-size:.98rem;border-radius:14px}
  .nav-link[aria-current="page"]::after{
    left:auto;right:14px;top:50%;bottom:auto;width:6px;height:6px;border-radius:50%;
    transform:translateY(-50%);
  }
  .header-actions{flex-direction:column;align-items:stretch;gap:10px;width:100%}
  .header-actions .btn{width:100%;padding:12px 18px}
  .header-actions .btn-quiet{display:inline-flex}
}
@media (max-width:640px){
  h1{font-size:clamp(1.9rem,7.4vw,2.5rem)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-legacy{gap:6px 14px}
}
@media (max-width:420px){
  .footer-grid{grid-template-columns:1fr}
  .brand-name{font-size:.95rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1;transform:none;transition:none;transition-delay:0ms}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
}