/* ============================================================
   亿万品牌站 · 共享样式表  /assets/site.css
   基调：午夜发布厅 × 数字档案库
   ============================================================ */

/* ---------- 1. RESET ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
@media (prefers-reduced-motion: no-preference){ html{scroll-behavior:smooth;} }
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dt,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,picture,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
hr{border:0;}

/* ---------- 2. 设计令牌 ---------- */
:root{
  /* 色彩 */
  --c-space:#070E24;
  --c-midnight:#0E1A3C;
  --c-line:#1E2C57;
  --c-cyan:#21E6D0;
  --c-cyan-soft:#8FF4EA;
  --c-amber:#FF8A3C;
  --c-glow:#FFD166;
  --c-mist:#E9EEF9;
  --c-cold:#8A97BE;
  --c-abyss:#14213F;
  --c-amberink:#170A02;

  /* 字体 */
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Songti SC","SimSun",serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono","Courier New",monospace;

  /* 字号 */
  --fs-display:clamp(44px,8vw,132px);
  --fs-h1:clamp(32px,5.2vw,72px);
  --fs-h2:clamp(24px,3.2vw,42px);
  --fs-h3:clamp(19px,1.8vw,25px);
  --fs-body:17px;
  --fs-small:14px;
  --fs-label:12.5px;
  --lh-body:1.75;

  /* 尺寸 */
  --w-page:1240px;
  --w-text:68ch;
  --pad-x:clamp(20px,4vw,56px);
  --gap:clamp(16px,2vw,30px);
  --strip-h:38px;
  --bar-h:72px;
  --header-h:calc(var(--strip-h) + var(--bar-h));
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  overflow-x:hidden;
  background-color:var(--c-space);
  background-image:
    radial-gradient(1100px 560px at 84% -12%, rgba(33,230,208,.10), transparent 62%),
    radial-gradient(880px 520px at 6% 104%, rgba(255,138,60,.09), transparent 64%);
  background-attachment:fixed;
  background-repeat:no-repeat;
  color:var(--c-mist);
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
}
@media (max-width:900px){ body{background-attachment:scroll;} }

h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.12;color:var(--c-mist);}
h1{font-size:var(--fs-h1);}
h2{font-size:var(--fs-h2);}
h3{font-size:var(--fs-h3);font-weight:700;}
p{max-width:var(--w-text);}
strong{color:var(--c-cyan-soft);font-weight:700;}
::selection{background:rgba(33,230,208,.28);color:var(--c-mist);}

:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;border-radius:1px;}

.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em;}
.serif{font-family:var(--font-serif);}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:var(--fs-label);letter-spacing:.16em;text-transform:uppercase;
  color:var(--c-cold);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--c-line);}
.index-num{
  font-family:var(--font-serif);font-weight:400;
  font-size:clamp(30px,4.4vw,64px);line-height:1;
  color:var(--c-line);letter-spacing:.02em;
}
.lede{font-size:clamp(17px,1.5vw,19px);line-height:1.7;color:var(--c-mist);max-width:var(--w-text);}
.prose{max-width:var(--w-text);}
.prose p + p{margin-top:1.05em;}
.prose a{border-bottom:1px solid rgba(33,230,208,.45);color:var(--c-cyan-soft);}
.prose a:hover{border-bottom-color:var(--c-cyan);}

/* ---------- 4. 布局骨架 ---------- */
.shell,.header-strip__inner,.header-bar__inner,.site-footer__inner{
  width:min(100% - (var(--pad-x) * 2), var(--w-page));
  margin-inline:auto;
}
.grid{display:grid;gap:var(--gap);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.rule{height:1px;background:var(--c-line);border:0;margin:0;}
.rule--glow{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--c-cyan),rgba(33,230,208,0) 55%,var(--c-amber));opacity:.6;}
.stack-sm{display:grid;gap:10px;}
.stack-md{display:grid;gap:var(--gap);}

#main-content{padding-top:var(--header-h);}
#main-content[data-flush]{padding-top:0;}

/* ---------- 5. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 19px;border:1px solid var(--c-line);border-radius:var(--radius);
  background:var(--c-midnight);color:var(--c-mist);
  font-family:var(--font-sans);font-size:var(--fs-small);font-weight:600;line-height:1;
  letter-spacing:.02em;white-space:nowrap;text-decoration:none;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn:hover{border-color:var(--c-cyan);color:var(--c-cyan-soft);}
.btn--amber{background:var(--c-amber);border-color:var(--c-amber);color:var(--c-amberink);font-weight:700;}
.btn--amber:hover{background:#FFA668;border-color:#FFA668;color:var(--c-amberink);box-shadow:0 0 0 4px rgba(255,138,60,.16);}
.btn--cyan{background:rgba(33,230,208,.08);border-color:rgba(33,230,208,.55);color:var(--c-cyan-soft);}
.btn--cyan:hover{background:rgba(33,230,208,.16);border-color:var(--c-cyan);color:var(--c-cyan-soft);}
.btn--ghost{background:transparent;}
.btn--sm{padding:8px 13px;font-size:13px;}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--c-line);border-radius:999px;
  background:rgba(20,33,63,.6);
  font-family:var(--font-sans);font-size:var(--fs-label);letter-spacing:.08em;line-height:1.5;
  color:var(--c-cold);white-space:nowrap;
}
.tag--cyan{color:var(--c-cyan-soft);border-color:rgba(33,230,208,.42);background:rgba(33,230,208,.08);}
.tag--amber{color:#FFB27B;border-color:rgba(255,138,60,.45);background:rgba(255,138,60,.10);}
.tag--glow{color:var(--c-glow);border-color:rgba(255,209,102,.45);background:rgba(255,209,102,.10);}
[data-copy]{cursor:pointer;transition:border-color .2s var(--ease),box-shadow .2s var(--ease);}
[data-copy][data-copied]{border-color:var(--c-cyan);box-shadow:0 0 0 4px rgba(33,230,208,.18);}

.dot{
  display:inline-block;flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  background:var(--c-glow);box-shadow:0 0 0 3px rgba(255,209,102,.16);
}
@media (prefers-reduced-motion: no-preference){
  .dot{animation:dot-breathe 2.8s var(--ease) infinite;}
  @keyframes dot-breathe{
    0%,100%{box-shadow:0 0 0 3px rgba(255,209,102,.16);}
    50%{box-shadow:0 0 0 8px rgba(255,209,102,.03);}
  }
}

/* ---------- 6. 进度条 / 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-220%);
  padding:11px 18px;background:var(--c-mist);color:var(--c-space);
  font-size:var(--fs-small);font-weight:700;border-radius:var(--radius);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);}

.scroll-meter{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:90;
  background:rgba(30,44,87,.4);pointer-events:none;
}
.scroll-meter__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-glow) 55%,var(--c-amber));
}
@media (prefers-reduced-motion: no-preference){
  .scroll-meter__bar{transition:width .12s linear;}
}

/* ---------- 7. 页头 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:transparent;border-bottom:1px solid transparent;
  transition:background-color .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.site-header[data-scrolled]{
  background:rgba(7,14,36,.94);
  border-bottom-color:var(--c-line);
  box-shadow:0 18px 40px -34px rgba(0,0,0,.9);
}
@supports (backdrop-filter: blur(8px)){
  .site-header[data-scrolled]{backdrop-filter:blur(12px) saturate(140%);}
}

.header-strip{
  border-bottom:1px solid rgba(30,44,87,.7);
  max-height:var(--strip-h);overflow:hidden;opacity:1;
  transition:max-height .25s var(--ease),opacity .2s var(--ease),border-color .25s var(--ease);
}
.site-header[data-scrolled] .header-strip{max-height:0;opacity:0;border-bottom-color:transparent;}
.header-strip__inner{
  min-height:var(--strip-h);
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.status-badge{
  display:inline-flex;align-items:center;gap:9px;
  font-size:var(--fs-label);letter-spacing:.12em;color:var(--c-mist);
  max-width:none;
}
.header-strip__meta{font-size:11.5px;letter-spacing:.1em;color:var(--c-cold);max-width:none;}

.header-bar__inner{
  min-height:var(--bar-h);
  display:flex;align-items:center;gap:clamp(14px,2vw,30px);
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;}
.brand__mark{
  width:38px;height:38px;flex:0 0 auto;
  display:grid;place-items:center;
  border:1px solid var(--c-line);border-radius:var(--radius);
  background:linear-gradient(150deg,rgba(33,230,208,.16),rgba(255,138,60,.10));
  color:var(--c-cyan);font-family:var(--font-sans);font-size:17px;font-weight:800;line-height:1;
}
.brand__text{display:flex;flex-direction:column;gap:4px;}
.brand__name{font-size:16px;font-weight:800;letter-spacing:-.01em;color:var(--c-mist);white-space:nowrap;}
.brand__sub{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--c-cold);}
.brand:hover .brand__mark{border-color:var(--c-cyan);}
.brand--footer .brand__mark{width:44px;height:44px;font-size:19px;}

/* 主导航 */
.primary-nav{margin-left:auto;}
.primary-nav__list{display:flex;align-items:center;gap:clamp(12px,1.7vw,26px);}
.primary-nav__link{
  position:relative;display:inline-block;padding:8px 2px;
  font-size:15px;font-weight:500;letter-spacing:.02em;color:var(--c-mist);
  transition:color .2s var(--ease);
}
.primary-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:1px;
  background:var(--c-cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform .18s var(--ease);
}
.primary-nav__link:hover{color:var(--c-cyan-soft);}
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after{transform:scaleX(1);}
.primary-nav__link[aria-current="page"]{color:var(--c-cyan-soft);font-weight:700;}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-amber);}

/* 页头右侧 */
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.chip{
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 14px;border-radius:999px;
  border:1px solid rgba(255,209,102,.34);
  background:rgba(255,209,102,.07);
  color:var(--c-glow);font-size:var(--fs-label);letter-spacing:.06em;line-height:1;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.chip:hover{background:rgba(255,209,102,.14);border-color:rgba(255,209,102,.6);}
.chip[aria-expanded="true"]{background:rgba(255,209,102,.2);box-shadow:0 0 0 4px rgba(255,209,102,.12);}
.chip__star{font-size:12px;color:var(--c-glow);}
.chip__label{font-weight:600;color:var(--c-mist);}
.chip__quota{font-size:11.5px;color:var(--c-glow);}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;border:1px solid var(--c-line);border-radius:var(--radius);
  color:var(--c-mist);font-size:var(--fs-label);letter-spacing:.08em;
  transition:border-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-cyan);}
.nav-toggle__bars{display:grid;gap:4px;width:18px;}
.nav-toggle__bars span{display:block;height:1px;background:var(--c-mist);transition:transform .2s var(--ease),opacity .2s var(--ease);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 收藏额度面板 */
.collection-panel{
  border-top:1px solid var(--c-line);
  border-bottom:1px solid var(--c-line);
  background:rgba(10,18,42,.97);
}
.collection-panel[hidden]{display:none;}
.collection-panel__inner{
  width:min(100% - (var(--pad-x) * 2), var(--w-page));
  margin-inline:auto;
  padding:20px 0 24px;
  display:grid;gap:10px;max-width:520px;
}
.collection-panel__title{font-size:var(--fs-label);letter-spacing:.16em;color:var(--c-glow);max-width:none;}
.collection-panel__meta{font-size:12px;color:var(--c-cold);max-width:none;}
.collection-panel__note{font-size:13.5px;line-height:1.65;color:var(--c-cold);max-width:none;}

.meter{
  height:6px;width:100%;
  background:var(--c-abyss);border:1px solid var(--c-line);border-radius:999px;overflow:hidden;
}
.meter__fill{display:block;height:100%;background:linear-gradient(90deg,var(--c-amber),var(--c-glow));}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  margin-top:clamp(64px,10vw,140px);
  border-top:1px solid var(--c-line);
  background:linear-gradient(180deg,rgba(14,26,60,.72),rgba(7,14,36,.98));
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) repeat(3,minmax(0,.82fr)) minmax(0,1.35fr);
  gap:clamp(26px,3vw,50px);
  padding:clamp(44px,6vw,86px) 0 clamp(30px,4vw,52px);
}
.footer-brand{display:grid;gap:16px;align-content:start;}
.footer-brand__note{font-size:14.5px;line-height:1.7;color:var(--c-cold);max-width:34ch;}
.footer-brand__status{
  display:inline-flex;align-items:center;gap:9px;
  font-size:var(--fs-label);letter-spacing:.12em;color:var(--c-mist);max-width:none;
}
.footer-brand__coord{font-size:11.5px;letter-spacing:.14em;color:var(--c-line);}

.footer-col{display:grid;gap:14px;align-content:start;}
.footer-col__heading{
  font-size:var(--fs-label);font-weight:700;letter-spacing:.16em;color:var(--c-cold);
  text-transform:uppercase;line-height:1.4;
}
.footer-col__list{display:grid;gap:10px;}
.footer-link{
  position:relative;display:inline-block;padding-bottom:3px;
  font-size:14.5px;color:var(--c-mist);transition:color .2s var(--ease);
}
.footer-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--c-cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform .18s var(--ease);
}
.footer-link:hover{color:var(--c-cyan-soft);}
.footer-link:hover::after,.footer-link:focus-visible::after{transform:scaleX(1);}

.footer-contact{display:grid;gap:14px;align-content:start;}
.footer-contact__list{display:grid;gap:14px;}
.footer-contact__list li{display:grid;gap:5px;}
.footer-contact__k{font-size:11.5px;letter-spacing:.14em;color:var(--c-cold);}
.footer-contact__v{font-size:13.5px;line-height:1.6;color:var(--c-mist);overflow-wrap:anywhere;}

.footer-base{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:12px 30px;
  padding:20px 0 34px;border-top:1px solid var(--c-line);
}
.footer-base__legal{font-size:12.5px;letter-spacing:.1em;color:var(--c-cold);max-width:none;}
.footer-base__meta{font-size:12.5px;color:var(--c-cold);max-width:none;}
.footer-base__note{font-size:12.5px;line-height:1.6;color:var(--c-cold);max-width:52ch;}

/* ---------- 9. 通用组件 ---------- */
.card{
  position:relative;
  background:var(--c-midnight);
  border:1px solid var(--c-line);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,30px);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.card:hover{border-color:rgba(33,230,208,.5);box-shadow:0 20px 44px -34px rgba(33,230,208,.85);}
.card__meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--c-cold);}
.card__title{margin-top:10px;font-size:var(--fs-h3);font-weight:700;letter-spacing:-.01em;}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--c-cold);
}
.breadcrumbs a{color:var(--c-cold);border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease);}
.breadcrumbs a:hover{color:var(--c-cyan-soft);border-bottom-color:var(--c-cyan);}
.breadcrumbs__sep{color:var(--c-line);}
.breadcrumbs [aria-current="page"]{color:var(--c-mist);}

.figure{margin:0;display:grid;gap:12px;}
.figure__frame{
  position:relative;display:block;width:100%;overflow:hidden;
  background:var(--c-midnight);
  border:1px solid var(--c-line);border-radius:var(--radius);
}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(33,230,208,.10),rgba(7,14,36,0) 58%),
    radial-gradient(120% 82% at 100% 0%,rgba(255,138,60,.16),transparent 62%);
}
.figure__frame img,.figure__frame picture,.figure__frame video{width:100%;height:100%;object-fit:cover;}
.figure__caption{font-size:var(--fs-label);letter-spacing:.06em;line-height:1.7;color:var(--c-cold);}
.figure--21x9 .figure__frame{aspect-ratio:21/9;}
.figure--16x9 .figure__frame{aspect-ratio:16/9;}
.figure--4x3  .figure__frame{aspect-ratio:4/3;}
.figure--1x1  .figure__frame{aspect-ratio:1/1;}
.figure--3x4  .figure__frame{aspect-ratio:3/4;}

/* ---------- 10. 入场显现 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(16px);}
.js [data-reveal].is-visible{opacity:1;transform:none;}
@media (prefers-reduced-motion: no-preference){
  .js [data-reveal]{transition:opacity .55s var(--ease),transform .55s var(--ease);}
}

/* ---------- 11. 断点 ---------- */
@media (max-width:1180px){
  .primary-nav__list{gap:16px;}
  .primary-nav__link{font-size:14.5px;}
}
@media (max-width:1080px){
  :root{--strip-h:0px;--bar-h:64px;}
  .header-strip{display:none;}
  .header-actions{margin-left:auto;}
  .nav-toggle{display:inline-flex;}

  .primary-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    margin:0;padding:6px var(--pad-x) 26px;
    background:rgba(10,18,42,.98);
    border-top:1px solid var(--c-line);
    border-bottom:1px solid var(--c-line);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
  }
  .primary-nav[data-open]{opacity:1;visibility:visible;transform:none;pointer-events:auto;}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .primary-nav__item{border-bottom:1px solid var(--c-line);}
  .primary-nav__link{display:block;padding:16px 2px;font-size:17px;}
  .primary-nav__link::after{display:none;}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-brand{grid-column:1 / -1;}
  .footer-contact{grid-column:1 / -1;}
}
@media (max-width:760px){
  .header-cta{display:none;}
  .chip__label{display:none;}
  .chip{padding:8px 12px;}
  .brand__name{font-size:14.5px;}
  .brand__mark{width:34px;height:34px;font-size:15px;}
  .brand__sub{font-size:10px;letter-spacing:.16em;}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-base{flex-direction:column;align-items:flex-start;}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
}
@media (max-width:420px){
  .brand__sub{display:none;}
  .brand__name{font-size:13.5px;}
  .nav-toggle__text{display:none;}
}

/* ---------- 12. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .js [data-reveal]{opacity:1;transform:none;}
  .scroll-meter__bar{transition:none;}
}