/* ============================================================
   乐天堂主页 · 全站共享样式 /assets/site.css
   深墨蓝基底 / 暖金强调 / 朱砂提醒 / 浅青灰分隔 / 纸白正文
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-900:#0A1A2F;
  --ink-850:#0C2038;
  --ink-800:#0C2138;
  --ink-700:#102A4C;
  --line-blue:#2D567F;
  --line-soft:rgba(45,86,127,.55);
  --gold:#D8A84E;
  --gold-bright:#E9C276;
  --gold-soft:rgba(216,168,78,.14);
  --vermilion:#C84B3B;
  --vermilion-soft:rgba(200,75,59,.16);
  --mist:#D8E2E8;
  --mist-dim:rgba(216,226,232,.70);
  --paper:#F6F3EC;
  --glass:rgba(246,243,236,.08);
  --glass-line:rgba(246,243,236,.18);

  --font-head:"Noto Sans SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;

  --shell:1200px;
  --gutter:clamp(18px,4vw,48px);
  --header-h:74px;

  --step--1:clamp(12px,.85vw + 10px,13.5px);
  --step-0:clamp(16px,1.05vw + 13px,18px);
  --step-1:clamp(18px,1.2vw + 14px,20px);
  --step-2:clamp(20px,1.7vw + 14px,26px);
  --step-3:clamp(24px,2.4vw + 16px,34px);
  --step-4:clamp(30px,3.6vw + 18px,48px);
  --step-5:clamp(38px,5.2vw + 20px,72px);

  --ease:cubic-bezier(.22,.61,.36,1);
  --radius:2px;
  --shadow-float:0 18px 48px rgba(3,10,20,.5);
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 14px);
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(900px 520px at 88% -8%, rgba(216,168,78,.09), transparent 62%),
    radial-gradient(760px 520px at -10% 16%, rgba(45,86,127,.22), transparent 66%);
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:var(--step-0);
  line-height:1.8;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img,picture,svg,video{max-width:100%;display:block}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.015em;
  margin:0 0 .55em;
  color:var(--paper);
}
h1{font-size:var(--step-5)}
h2{font-size:var(--step-4)}
h3{font-size:var(--step-3)}
h4{font-size:var(--step-2)}
p{margin:0 0 1.1em}
a{color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

/* ---------- 3. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:12px;z-index:200;
  transform:translateY(-180%);
  padding:10px 16px;
  background:var(--gold);color:#161006;
  font-family:var(--font-head);font-size:14px;font-weight:700;
  text-decoration:none;border-radius:var(--radius);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 4. 共享页头 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  background-color:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .34s var(--ease),border-color .34s var(--ease),backdrop-filter .34s var(--ease);
}
.site-header::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,26,47,.80) 0%,rgba(10,26,47,.34) 58%,rgba(10,26,47,0) 100%);
  opacity:1;transition:opacity .34s var(--ease);
}
.site-header[data-scrolled]{
  background-color:rgba(10,26,47,.96);
  border-bottom-color:var(--line-blue);
  -webkit-backdrop-filter:blur(12px) saturate(120%);
  backdrop-filter:blur(12px) saturate(120%);
}
.site-header[data-scrolled]::before{opacity:0}

.header-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(216,226,232,.08);
  pointer-events:none;overflow:hidden;
}
.header-progress > span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--gold) 0%,var(--gold-bright) 55%,var(--vermilion) 100%);
}

.header-shell{
  position:relative;z-index:1;
  max-width:var(--shell);margin:0 auto;
  padding:0 var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;gap:clamp(14px,2vw,30px);
}

/* 品牌 */
.brand-mark{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:12px;
  text-decoration:none;color:var(--paper);
}
.brand-mark__ticks{display:inline-flex;flex-direction:column;gap:3px;width:22px}
.brand-mark__ticks i{display:block;height:2px;transition:width .28s var(--ease),background-color .28s var(--ease)}
.brand-mark__ticks i:nth-child(1){width:22px;background:var(--gold)}
.brand-mark__ticks i:nth-child(2){width:14px;background:var(--mist);opacity:.78}
.brand-mark__ticks i:nth-child(3){width:7px;background:var(--vermilion)}
.brand-mark:hover .brand-mark__ticks i:nth-child(1){width:12px}
.brand-mark:hover .brand-mark__ticks i:nth-child(3){width:22px}
.brand-mark__text{display:flex;flex-direction:column;line-height:1.2}
.brand-mark__name{font-family:var(--font-head);font-size:17px;font-weight:800;letter-spacing:.02em}
.brand-mark__tag{font-size:11.5px;letter-spacing:.14em;color:var(--mist-dim)}

/* 主导航 */
.site-nav{
  flex:1 1 auto;display:flex;align-items:center;justify-content:center;
}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.7vw,26px)}
.nav-link{
  position:relative;display:inline-block;padding:10px 2px;
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.02em;
  color:var(--mist-dim);text-decoration:none;white-space:nowrap;
  transition:color .24s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:4px;height:2px;
  background:var(--gold);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .3s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--paper)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-foot{display:none}
.nav-foot__rule{display:block;height:1px;background:var(--line-soft)}

/* 右侧状态区 */
.header-side{flex:0 0 auto;display:flex;align-items:center;gap:12px}
.bookmark-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 12px;border:1px solid var(--glass-line);border-radius:999px;
  background:var(--glass);color:var(--mist);
  font-size:12px;letter-spacing:.06em;white-space:nowrap;
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  transition:border-color .24s var(--ease),color .24s var(--ease);
}
.bookmark-chip:hover{border-color:rgba(216,168,78,.6);color:var(--paper)}
.bookmark-chip__dot{
  width:6px;height:6px;border-radius:50%;background:var(--gold);
  box-shadow:0 0 0 3px rgba(216,168,78,.18);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border:1px solid var(--glass-line);border-radius:var(--radius);
  background:var(--glass);color:var(--paper);
  font-family:var(--font-head);font-size:13px;font-weight:700;letter-spacing:.04em;
  cursor:pointer;
  transition:border-color .24s var(--ease),background-color .24s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{
  display:block;height:2px;background:currentColor;
  transition:transform .26s var(--ease),opacity .26s var(--ease),width .26s var(--ease);
}
.nav-toggle__bars i:nth-child(1){width:16px}
.nav-toggle__bars i:nth-child(2){width:10px}
.nav-toggle__bars i:nth-child(3){width:16px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- 5. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:1px solid transparent;border-radius:var(--radius);
  font-family:var(--font-head);font-size:14px;font-weight:700;letter-spacing:.03em;
  text-decoration:none;cursor:pointer;
  transition:background-color .22s var(--ease),color .22s var(--ease),
             border-color .22s var(--ease),transform .12s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--gold{background:var(--gold);border-color:var(--gold);color:#1A1206}
.btn--gold:hover{background:var(--gold-bright);border-color:var(--gold-bright)}
.btn--ghost{background:transparent;border-color:rgba(216,226,232,.34);color:var(--paper)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--sm{padding:9px 15px;font-size:13px}

/* ---------- 6. 布局骨架 ---------- */
main{display:block;padding-top:var(--header-h)}
.bleed-top{margin-top:calc(-1 * var(--header-h))}
.shell{
  width:100%;max-width:var(--shell);margin:0 auto;
  padding-left:var(--gutter);padding-right:var(--gutter);
}
.section{padding:clamp(44px,7vw,96px) 0;position:relative}
.section--tight{padding:clamp(26px,4vw,52px) 0}
.section--paper{background:var(--paper);color:var(--ink-900)}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4{color:var(--ink-900)}
.section--ink{background:var(--ink-850)}
.section--glass{
  background:var(--glass);
  border-top:1px solid var(--glass-line);
  border-bottom:1px solid var(--glass-line);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}

.grid{display:grid;gap:clamp(18px,2.4vw,36px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym-a{grid-template-columns:minmax(0,3fr) minmax(0,6fr) minmax(0,3fr)}
.grid--asym-b{grid-template-columns:minmax(0,2fr) minmax(0,7fr) minmax(0,3fr)}
.grid--asym-c{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}

/* ---------- 7. 档案装饰零件 ---------- */
.rule-ticks{
  height:9px;color:var(--line-blue);opacity:.85;
  background-image:repeating-linear-gradient(90deg,currentColor 0 1px,transparent 1px 26px);
}
.rule-ticks--gold{color:var(--gold);opacity:.7}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-head);font-size:12px;font-weight:700;
  letter-spacing:.2em;color:var(--gold);margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid transparent;border-radius:var(--radius);
  font-size:12px;font-weight:600;letter-spacing:.1em;line-height:1.6;
}
.tag--gold{background:var(--gold-soft);border-color:rgba(216,168,78,.4);color:var(--gold)}
.tag--vermilion{background:var(--vermilion-soft);border-color:rgba(200,75,59,.45);color:#E9907F}
.tag--mist{background:rgba(216,226,232,.1);border-color:var(--glass-line);color:var(--mist)}
.tag--solid{background:var(--ink-700);border-color:var(--line-blue);color:var(--mist)}

.frame{
  position:relative;border:1px solid var(--line-blue);border-radius:var(--radius);
  background:linear-gradient(155deg,rgba(16,42,76,.92),rgba(10,26,47,.96));
}
.frame__corner{position:absolute;width:14px;height:14px;border:2px solid var(--gold);pointer-events:none}
.frame__corner--tl{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame__corner--tr{top:-1px;right:-1px;border-left:0;border-bottom:0}
.frame__corner--bl{bottom:-1px;left:-1px;border-right:0;border-top:0}
.frame__corner--br{bottom:-1px;right:-1px;border-left:0;border-top:0}

/* ---------- 8. 媒体容器（供页面阶段放置图片） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line-blue);border-radius:var(--radius);
  background:
    linear-gradient(135deg,rgba(45,86,127,.35),rgba(10,26,47,.9)),
    var(--ink-700);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,26,47,0) 42%,rgba(10,26,47,.62) 100%);
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .6s var(--ease),opacity .4s var(--ease);
}
.media-frame--zoom:hover > img,
.media-frame--zoom:hover > picture > img{transform:scale(1.03)}
.media-frame--ratio-21x9{aspect-ratio:21/9}
.media-frame--ratio-16x9{aspect-ratio:16/9}
.media-frame--ratio-4x3{aspect-ratio:4/3}
.media-frame--ratio-1x1{aspect-ratio:1/1}
.media-frame--ratio-3x4{aspect-ratio:3/4}
.media-frame--glass{border-color:var(--glass-line);background:var(--glass)}
.media-frame--tall{min-height:clamp(240px,38vw,520px)}

/* ---------- 9. 正文与卡片 ---------- */
.prose{max-width:68ch;font-size:var(--step-0);line-height:1.85;color:var(--mist)}
.prose > * + *{margin-top:1em}
.prose h2{font-size:var(--step-3);margin-top:1.8em;color:var(--paper)}
.prose h3{font-size:var(--step-2);margin-top:1.5em;color:var(--paper)}
.prose ul{list-style:disc;margin:1em 0 1em 1.25em}
.prose ol{list-style:decimal;margin:1em 0 1em 1.25em}
.prose li{margin:.4em 0}
.prose a{color:var(--gold);text-decoration:underline;text-underline-offset:3px}
.section--paper .prose{color:#22323F}
.section--paper .prose h2,.section--paper .prose h3{color:var(--ink-900)}

.card{
  position:relative;
  border:1px solid var(--line-soft);border-radius:var(--radius);
  background:var(--ink-800);
  padding:clamp(18px,2.2vw,28px);
  transition:border-color .26s var(--ease),transform .26s var(--ease),background-color .26s var(--ease);
}
.card:hover{border-color:var(--gold);transform:translateY(-2px)}
.card--glass{
  background:var(--glass);border-color:var(--glass-line);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:14px 0;font-size:12.5px;color:var(--mist-dim);
}
.breadcrumb__link{color:var(--mist-dim);text-decoration:none;transition:color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--gold)}
.breadcrumb__sep{opacity:.55}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 10. 显现动效协议 ---------- */
html[data-js] [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
}
html[data-js] [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 11. 共享页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,128px);
  background:linear-gradient(180deg,var(--ink-850) 0%,#081426 100%);
  border-top:1px solid var(--line-blue);
  color:var(--mist);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:8px;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,var(--line-blue) 0 1px,transparent 1px 24px);
  opacity:.6;
}
.footer-shell{
  max-width:var(--shell);margin:0 auto;
  padding:clamp(38px,5vw,68px) var(--gutter) clamp(28px,4vw,48px);
  display:grid;gap:clamp(24px,3.2vw,52px);
  grid-template-columns:minmax(220px,1.5fr) minmax(120px,.85fr) minmax(120px,.85fr) minmax(240px,1.7fr);
}
.footer-brand__mark{
  display:block;
  font-family:var(--font-head);font-size:19px;font-weight:800;
  letter-spacing:.03em;color:var(--paper);
}
.footer-brand__mark::after{
  content:"";display:block;width:46px;height:3px;margin-top:10px;
  background:linear-gradient(90deg,var(--gold),var(--vermilion));
}
.footer-brand__line{
  margin:14px 0 16px;max-width:30ch;
  font-size:14px;line-height:1.75;color:var(--mist-dim);
}
.footer-brand__meta{
  display:inline-block;padding:5px 11px;border:1px solid var(--line-soft);border-radius:999px;
  font-size:12px;letter-spacing:.08em;color:var(--mist);
}
.footer-nav{display:contents}
.footer-nav__title{
  font-family:var(--font-head);font-size:12px;font-weight:700;
  letter-spacing:.16em;color:var(--gold);margin:0 0 14px;
}
.footer-nav__list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-block;padding:6px 0;font-size:14px;color:var(--mist);
  text-decoration:none;border-bottom:1px solid transparent;
  transition:color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{
  color:var(--gold);border-bottom-color:var(--gold);transform:translateX(4px);
}
.footer-contact__item{
  display:grid;grid-template-columns:auto 1fr;gap:2px 14px;align-items:baseline;
  margin:0;padding:9px 0;font-size:14px;
  border-bottom:1px dashed rgba(45,86,127,.5);
}
.footer-contact__key{font-size:12px;letter-spacing:.12em;color:var(--gold)}
.footer-contact__val{color:var(--paper);word-break:break-word}
.footer-note{margin:14px 0 0;font-size:12.5px;line-height:1.7;color:var(--mist-dim)}
.footer-base{
  max-width:var(--shell);margin:0 auto;
  padding:18px var(--gutter) 30px;
  border-top:1px solid rgba(45,86,127,.5);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 26px;font-size:12.5px;color:var(--mist-dim);
}
.footer-base__copy{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:6px 18px}
.footer-legal__link{
  display:inline-block;padding:4px 0;color:var(--mist-dim);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.footer-legal__link:hover,.footer-legal__link:focus-visible{color:var(--paper);border-bottom-color:var(--gold)}

/* ---------- 12. 返回页首 ---------- */
.to-top{
  position:fixed;right:clamp(14px,3vw,34px);bottom:clamp(14px,3vw,34px);z-index:90;
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 16px;border:1px solid var(--line-blue);border-radius:999px;
  background:rgba(16,42,76,.94);color:var(--paper);
  font-family:var(--font-head);font-size:13px;font-weight:700;letter-spacing:.04em;
  cursor:pointer;box-shadow:0 10px 28px rgba(3,10,20,.5);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  transition:border-color .22s var(--ease),color .22s var(--ease),
             transform .16s var(--ease),opacity .24s var(--ease);
}
.to-top[hidden]{display:none}
.to-top:hover{border-color:var(--gold);color:var(--gold)}
.to-top:active{transform:translateY(1px)}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1180px){
  .nav-list{gap:clamp(8px,1.2vw,16px)}
  .nav-link{font-size:13.5px}
}
@media (max-width:1080px){
  .bookmark-chip{display:none}
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    display:block;flex:0 0 auto;
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    padding:10px var(--gutter) 26px;
    background:linear-gradient(180deg,rgba(16,42,76,.99),rgba(10,26,47,.99));
    border-top:1px solid var(--line-blue);
    border-bottom:1px solid var(--line-blue);
    box-shadow:var(--shadow-float);
    transform:translateY(-14px);opacity:0;visibility:hidden;pointer-events:none;
    transition:transform .3s var(--ease),opacity .3s var(--ease),visibility .3s var(--ease);
  }
  .site-nav[data-open]{
    transform:none;opacity:1;visibility:visible;pointer-events:auto;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list > li + li{border-top:1px solid rgba(45,86,127,.5)}
  .nav-link{display:block;padding:15px 4px;font-size:16px}
  .nav-link::after{bottom:9px;right:auto;width:26px}
  .nav-foot{
    display:flex;align-items:center;gap:10px;margin-top:18px;
    font-size:12px;letter-spacing:.1em;color:var(--mist-dim);
  }
  .nav-foot__rule{flex:1 1 auto}
}
@media (max-width:980px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .grid--2,.grid--3,.grid--asym-a,.grid--asym-b,.grid--asym-c{grid-template-columns:1fr}
  .footer-shell{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:700px){
  :root{--header-h:64px}
  .brand-mark__tag{display:none}
  .brand-mark__ticks{width:18px}
  .brand-mark__ticks i:nth-child(1){width:18px}
  .footer-shell{grid-template-columns:1fr;gap:28px}
  .footer-base{flex-direction:column;align-items:flex-start}
  .to-top{right:12px;bottom:12px;padding:10px 14px}
}

/* ---------- 14. 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  html[data-js] [data-reveal]{opacity:1;transform:none}
}