/* ============================================================
   金年汇中文站 · 共享样式 /assets/site.css
   1 Reset · 2 Tokens · 3 Base · 4 Layout · 5 Components
   6 Header · 7 Footer · 8 Responsive · 9 Motion
   ============================================================ */

/* 1. Reset ------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,dl,dt,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{background:none;border:0;padding:0;font:inherit;color:inherit;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid #F2C14E;outline-offset:3px}

/* 2. Tokens ------------------------------------------------ */
:root{
  --deep-sea:#06283F;
  --trench:#0B4A72;
  --gold:#F2C14E;
  --gold-deep:#C9962F;
  --coral:#FF6A4D;
  --coral-deep:#D9432A;
  --mint:#3ECFA8;
  --mint-deep:#1E9C7A;
  --mist:#F4F7FA;
  --paper:#FFFFFF;
  --ink:#0E1A24;
  --slate:#6B8299;
  --line:#C8D6E1;

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --bevel:polygon(14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%,0 14px);
  --bevel-sm:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);

  --ease:cubic-bezier(.2,.8,.2,1);
  --t-fast:120ms;
  --t:180ms;
  --t-slow:240ms;

  --bar-h:32px;
  --nav-h:74px;
  --header-total:106px;
}

/* 3. Base -------------------------------------------------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.7;
  font-weight:400;
  letter-spacing:.005em;
  color:var(--ink);
  background:var(--mist);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:800;line-height:1.25;letter-spacing:-.02em;color:var(--deep-sea)}
h1{font-size:clamp(28px,4.6vw,44px);line-height:1.2}
h2{font-size:clamp(21px,2.6vw,32px)}
h3{font-size:clamp(17px,1.9vw,22px)}
p{max-width:74ch}
strong{font-weight:700}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em;font-size:.86em}
.u-visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:200;
  padding:11px 18px;font-weight:700;font-size:14px;
  background:var(--gold);color:var(--deep-sea);
  clip-path:var(--bevel-sm);
  transition:top var(--t) var(--ease);
}
.skip-link:focus{top:10px}

#main-content{padding-top:var(--header-total);display:block}
#main-content.main--flush{padding-top:0}

/* 4. Layout ------------------------------------------------ */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section,.band{position:relative;padding-block:clamp(48px,7vw,96px)}
.band--mist{background:var(--mist)}
.band--paper{background:var(--paper)}
.band--deep{background:var(--deep-sea);color:#DCE9F2}
.band--trench{background:var(--trench);color:#EAF3F9}
.band--deep h1,.band--deep h2,.band--deep h3,.band--trench h1,.band--trench h2,.band--trench h3{color:#fff}

.grid{display:grid;gap:clamp(20px,3vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr)}
.grid--offset>*:nth-child(even){margin-top:clamp(14px,2.5vw,34px)}

.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;line-height:1;
  letter-spacing:.14em;text-transform:uppercase;color:var(--gold-deep);
}
.kicker::before{content:"";width:22px;height:2px;background:currentColor;transform:skewX(-24deg)}
.band--deep .kicker,.band--trench .kicker{color:var(--gold)}

.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px 24px;
  padding-bottom:16px;margin-bottom:clamp(24px,3vw,40px);
  border-bottom:1px solid var(--line);
}
.section-head__title{font-size:clamp(19px,2.3vw,28px)}
.section-head__note{margin-left:auto;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--slate)}
.band--deep .section-head,.band--trench .section-head{border-color:rgba(200,214,225,.24)}
.band--deep .section-head__note,.band--trench .section-head__note{color:#9FBACD}

.rule-slant{height:1px;border:0;background:var(--line);transform:skewY(-24deg);transform-origin:left;margin-block:clamp(24px,4vw,48px)}

/* 5. Components -------------------------------------------- */
.panel{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  clip-path:var(--bevel);
  padding:clamp(20px,2.6vw,32px);
}
.panel--deep{background:var(--deep-sea);border-color:rgba(242,193,78,.35);color:#DCE9F2}
.panel--edge{border-top:3px solid var(--gold)}
.panel--edge-mint{border-top:3px solid var(--mint)}
.panel--edge-coral{border-top:3px solid var(--coral)}
.panel--interactive{transition:border-color var(--t) var(--ease),background var(--t) var(--ease),transform var(--t) var(--ease)}
.panel--interactive:hover{border-color:var(--gold-deep);transform:translateY(-3px)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 9px;border:1px solid currentColor;
  font-family:var(--font-mono);font-size:12px;line-height:1;letter-spacing:.06em;
  color:var(--trench);
}
.tag--gold{color:var(--gold-deep)}
.tag--mint{color:var(--mint-deep)}
.tag--coral{color:var(--coral-deep)}
.tag--deep{color:var(--deep-sea)}

.btn{
  position:relative;isolation:isolate;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;font-size:15px;font-weight:700;letter-spacing:-.01em;
  color:var(--deep-sea);
  transition:color var(--t) var(--ease),transform var(--t) var(--ease);
}
.btn::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:var(--gold);clip-path:var(--bevel);
  transition:background var(--t) var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:hover::before{background:var(--gold-deep)}
.btn--gold{color:var(--deep-sea)}
.btn--coral{color:#fff}
.btn--coral::before{background:var(--coral)}
.btn--coral:hover::before{background:var(--coral-deep)}
.btn--outline{color:#fff}
.btn--outline::before{background:rgba(255,255,255,.10)}
.btn--outline:hover{color:var(--gold)}
.btn--outline:hover::before{background:rgba(255,255,255,.18)}
.btn--ghost{color:var(--trench)}
.btn--ghost::before{background:rgba(11,74,114,.08)}
.btn--ghost:hover{color:var(--deep-sea)}
.btn--ghost:hover::before{background:rgba(11,74,114,.16)}
.btn--sm{padding:8px 15px;font-size:14px}
.btn--block{width:100%}

.link-more{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  font-weight:700;color:var(--trench);
  transition:color var(--t) var(--ease);
}
.link-more::before{
  content:"";position:absolute;left:0;right:22px;bottom:-3px;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform var(--t) var(--ease);
}
.link-more::after{content:"→";transition:transform var(--t) var(--ease)}
.link-more:hover{color:var(--gold-deep)}
.link-more:hover::before{transform:scaleX(1)}
.link-more:hover::after{transform:translateX(4px)}

.breadcrumb{font-family:var(--font-mono);font-size:13px;color:var(--slate)}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:4px;align-items:center}
.breadcrumb__item{display:inline-flex;align-items:center}
.breadcrumb__item:not(:last-child)::after{content:"/";margin-inline:8px;color:var(--line)}
.breadcrumb__item a{transition:color var(--t) var(--ease)}
.breadcrumb__item a:hover{color:var(--trench)}
.breadcrumb__item[aria-current="page"]{color:var(--deep-sea)}

.prose{max-width:74ch}
.prose h2{margin-top:clamp(28px,4vw,44px);margin-bottom:14px}
.prose h3{margin-top:clamp(22px,3vw,32px);margin-bottom:10px}
.prose p+p{margin-top:1em}
.prose ul{margin-block:1em;display:grid;gap:8px}
.prose li{position:relative;padding-left:18px}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--gold-deep)}

.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/10;
  background:linear-gradient(140deg,var(--trench),var(--deep-sea));
  clip-path:var(--bevel);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.09) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.09) 1px,transparent 1px);
  background-size:48px 48px;
}
.media-stack{position:relative}
.media-stack__shot{
  position:absolute;right:-6%;bottom:-8%;width:clamp(120px,38%,260px);
  background:var(--paper);border:1px solid var(--line);
  box-shadow:0 18px 40px rgba(6,40,63,.28);
  clip-path:var(--bevel-sm);
  overflow:hidden;
}
.media-stack__shot img{width:100%;height:auto}

/* 6. Header ------------------------------------------------ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  color:#fff;
  --nav-h:74px;
  background:linear-gradient(180deg,rgba(6,40,63,.95) 0%,rgba(6,40,63,.74) 62%,rgba(6,40,63,0) 100%);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  transition:background var(--t-slow) var(--ease),box-shadow var(--t-slow) var(--ease);
}
.site-header[data-scrolled]{
  --nav-h:62px;
  background:var(--deep-sea);
  box-shadow:0 10px 30px rgba(6,40,63,.28);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(242,193,78,.6),transparent);
  opacity:0;transition:opacity var(--t) var(--ease);
}
.site-header[data-scrolled]::after{opacity:1}

.version-bar{
  background:rgba(11,74,114,.55);
  border-bottom:1px solid rgba(200,214,225,.16);
  font-size:13px;
}
.version-bar__inner{display:flex;align-items:center;gap:12px;min-height:var(--bar-h);padding-block:4px}
.version-bar__badge{
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.08em;
  padding:3px 8px;color:var(--deep-sea);background:var(--gold);clip-path:var(--bevel-sm);
}
.version-bar__text{color:#CFE0EC;min-width:0}
.version-bar__meta{margin-left:auto;color:var(--gold);font-size:12px;white-space:nowrap}

.header-main__inner{display:flex;align-items:center;gap:20px;height:var(--nav-h);transition:height var(--t-slow) var(--ease)}

.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__mark{
  width:34px;height:34px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--gold),var(--gold-deep));
  color:var(--deep-sea);font-weight:800;font-size:17px;line-height:1;
  clip-path:var(--bevel-sm);
}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__name{font-size:17px;font-weight:800;letter-spacing:-.02em;color:#fff}
.brand__tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:rgba(255,255,255,.66)}

.primary-nav{margin-left:auto}
.primary-nav__list{display:flex;align-items:center;gap:2px}
.primary-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 12px;font-size:15px;font-weight:500;
  color:rgba(255,255,255,.86);
  transition:color var(--t) var(--ease);
}
.primary-nav__link::before{
  content:attr(data-index);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;
  color:rgba(242,193,78,.55);
  transition:color var(--t) var(--ease);
}
.primary-nav__link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left;
  transition:transform var(--t) var(--ease);
}
.primary-nav__link:hover{color:#fff}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--gold)}
.primary-nav__link[aria-current="page"]::before{color:var(--gold)}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

.nav-toggle{
  position:relative;display:none;width:44px;height:40px;
  border:1px solid rgba(200,214,225,.38);color:#fff;
  transition:border-color var(--t) var(--ease),background var(--t) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);background:rgba(242,193,78,.12)}
.nav-toggle__bars{position:absolute;inset:0;margin:auto;width:18px;height:12px}
.nav-toggle__bar{
  position:absolute;left:0;right:0;height:2px;background:currentColor;
  transition:transform var(--t) var(--ease),opacity var(--t) var(--ease);
}
.nav-toggle__bar:nth-child(1){top:0}
.nav-toggle__bar:nth-child(2){top:5px}
.nav-toggle__bar:nth-child(3){top:10px}
.site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.scroll-progress{
  position:absolute;left:0;bottom:0;z-index:3;
  width:100%;height:2px;pointer-events:none;
  background:linear-gradient(90deg,var(--gold),var(--mint));
  transform:scaleX(0);transform-origin:0 50%;
}

/* 7. Footer ------------------------------------------------ */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--deep-sea);color:#D8E5EE;
  padding-top:clamp(44px,6vw,80px);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(24deg,rgba(242,193,78,.07) 0 1px,transparent 1px 68px);
}
.site-footer::after{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--gold) 0 16%,var(--trench) 16% 56%,var(--mint) 56% 62%,rgba(62,207,168,0) 62% 100%);
}
.footer-shell{position:relative;z-index:1;padding-bottom:0}

.footer-top{
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:clamp(28px,4vw,64px);
}
.footer-brand__link{display:inline-flex;align-items:center;gap:10px}
.footer-brand__mark{
  width:34px;height:34px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--gold),var(--gold-deep));
  color:var(--deep-sea);font-weight:800;font-size:17px;line-height:1;
  clip-path:var(--bevel-sm);
}
.footer-brand__name{font-size:19px;font-weight:800;letter-spacing:-.02em;color:#fff}
.footer-brand__line{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--gold)}
.footer-summary{margin-top:14px;font-size:15px;color:#C6D8E4;max-width:52ch}

.footer-col__title{
  font-family:var(--font-mono);font-size:13px;font-weight:700;
  letter-spacing:.1em;color:var(--gold);
}
.contact-list{margin-top:16px;display:grid;gap:14px}
.contact-list__item{
  display:grid;grid-template-columns:76px minmax(0,1fr);gap:12px;align-items:baseline;
  padding-bottom:12px;border-bottom:1px solid rgba(200,214,225,.16);
}
.contact-list__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:#8FA9BC}
.contact-list__value{font-size:15px;color:#E6F0F7;word-break:break-word}
.contact-note{margin-top:16px;font-size:13px;line-height:1.7;color:#9FBACD;max-width:56ch}

.footer-columns{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(24px,3vw,48px);
  margin-top:clamp(36px,5vw,60px);padding-top:clamp(28px,4vw,44px);
  border-top:1px solid rgba(200,214,225,.18);
}
.footer-links{margin-top:16px;display:grid;gap:10px}
.footer-link{
  position:relative;display:inline-block;font-size:15px;color:#D8E5EE;
  transition:color var(--t) var(--ease);
}
.footer-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left;
  transition:transform var(--t) var(--ease);
}
.footer-link:hover{color:var(--gold)}
.footer-link:hover::after{transform:scaleX(1)}
.footer-col--index{border-left:1px solid rgba(200,214,225,.18);padding-left:clamp(16px,2vw,32px)}
.footer-index{margin-top:16px;font-family:var(--font-mono);font-size:15px;letter-spacing:.06em;color:#fff}
.footer-index-note{margin-top:10px;font-size:14px;color:#9FBACD;max-width:34ch}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  margin-top:clamp(36px,5vw,56px);padding-block:22px 28px;
  border-top:1px solid rgba(200,214,225,.18);
  font-size:13px;color:#9FBACD;
}
.footer-copy,.footer-icp{max-width:none}
.footer-icp{font-family:var(--font-mono);letter-spacing:.06em}

/* 8. Responsive -------------------------------------------- */
@media (max-width:1024px){
  :root{--bar-h:28px;--nav-h:64px;--header-total:92px}
  .site-header{--nav-h:64px}
  .site-header[data-scrolled]{--nav-h:56px}
  .primary-nav__link{padding:8px 9px;font-size:14px}
  .primary-nav__link::before{display:none}
}
@media (max-width:960px){
  .nav-toggle{display:block}
  .header-main__inner{gap:12px}
  .primary-nav{
    position:fixed;left:0;right:0;top:var(--header-total);margin-left:0;
    background:var(--deep-sea);
    border-top:1px solid rgba(242,193,78,.35);
    border-bottom:1px solid rgba(200,214,225,.18);
    max-height:0;overflow:hidden;
    transition:max-height var(--t-slow) var(--ease);
  }
  .site-header[data-open] .primary-nav{max-height:calc(100vh - var(--header-total));overflow-y:auto}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:6px var(--gutter) 20px}
  .primary-nav__link{
    display:flex;justify-content:flex-start;padding:15px 0;font-size:17px;
    border-bottom:1px solid rgba(200,214,225,.12);
  }
  .primary-nav__link::before{display:inline;font-size:11px}
  .primary-nav__link::after{display:none}
  .grid--2,.grid--3,.grid--split{grid-template-columns:minmax(0,1fr)}
  .grid--offset>*:nth-child(even){margin-top:0}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--index{border-left:0;padding-left:0}
}
@media (max-width:640px){
  body{font-size:15px}
  .version-bar__text{font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .version-bar__meta{display:none}
  .brand__tag{display:none}
  .header-actions .btn{display:none}
  .footer-columns{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .media-stack__shot{right:-2%;bottom:-6%;width:46%}
}

/* 9. Motion ------------------------------------------------ */
html.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html.js [data-reveal]{opacity:1;transform:none;transition:none}
  .btn:hover,.panel--interactive:hover{transform:none}
}