/* ============================================================
   亿万28手机 · 共享样式 /assets/site.css
   设计逻辑：放大版 iOS 控制中心 + 编辑部索引
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --bg:#070A12;
  --bg-2:#0E1B2E;
  --bg-3:#1A2233;
  --silver:#C7CEDB;
  --ice:#EAF2FF;
  --blue:#2F7BFF;
  --magenta:#FF3FA4;
  --mint:#4FE0B0;
  --orange:#FF9F45;
  --violet:#7A5CFF;

  --line:rgba(199,206,219,.14);
  --line-strong:rgba(199,206,219,.28);
  --surface-1:linear-gradient(160deg,rgba(14,27,46,.94),rgba(7,10,18,.88));
  --surface-2:linear-gradient(150deg,rgba(47,123,255,.20),rgba(122,92,255,.13) 46%,rgba(7,10,18,.92));

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

  --container:1240px;
  --header-h:120px;

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

  --shadow-island:0 26px 64px -34px rgba(47,123,255,.55);
  --shadow-deep:0 34px 70px -40px rgba(0,0,0,.95);
  --ease:cubic-bezier(.2,.7,.3,1);
}

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

/* ---------- 3. 基础排版 ---------- */
body{
  background-color:var(--bg);
  background-image:
    radial-gradient(980px 520px at 10% -8%,rgba(122,92,255,.20),transparent 66%),
    radial-gradient(820px 460px at 94% 2%,rgba(47,123,255,.18),transparent 62%),
    radial-gradient(720px 420px at 60% 108%,rgba(255,63,164,.10),transparent 70%);
  background-repeat:no-repeat;
  color:var(--silver);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.005em;
  min-height:100vh;
  padding-top:var(--header-h);
  transition:padding-top .32s var(--ease);
  overflow-x:hidden;
}
h1,h2,h3,h4{color:var(--ice);font-weight:800;line-height:1.16;letter-spacing:-.022em}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.5rem,3vw,2.15rem)}
h3{font-size:clamp(1.1rem,1.9vw,1.35rem)}
h4{font-size:1.02rem;letter-spacing:-.01em}
strong{color:var(--ice);font-weight:700}
p{max-width:74ch}
::selection{background:rgba(47,123,255,.45);color:#fff}

:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}
a:focus-visible,button:focus-visible{outline:2px solid var(--magenta);outline-offset:3px}

/* ---------- 4. 工具类 ---------- */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:clamp(1rem,4vw,2.5rem)}
.container--wide{max-width:1440px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.05em}
.visually-hidden{position:absolute;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}
.section{padding-block:clamp(2.4rem,6vw,4.6rem)}
.section__head{display:flex;flex-direction:column;gap:.8rem;max-width:66ch;margin-bottom:clamp(1.4rem,3vw,2.4rem)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.24em;
  text-transform:uppercase;color:var(--blue);
}
.eyebrow::before{content:"";width:26px;height:2px;background:linear-gradient(90deg,var(--blue),var(--magenta));border-radius:2px}
.lede{font-size:clamp(1rem,1.5vw,1.12rem);line-height:1.85;color:var(--silver)}
.trail{height:2px;border:0;background:linear-gradient(90deg,transparent,var(--blue),var(--magenta),transparent);opacity:.55;transform:skewY(-1.2deg)}
.halo{position:absolute;width:min(520px,62vw);aspect-ratio:1;border-radius:50%;filter:blur(70px);opacity:.32;pointer-events:none;background:radial-gradient(circle,rgba(47,123,255,.85),transparent 70%)}
.halo--magenta{background:radial-gradient(circle,rgba(255,63,164,.8),transparent 70%)}
.actions{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.85rem 1.4rem;border-radius:var(--pill);
  font-size:.95rem;font-weight:650;letter-spacing:.01em;white-space:nowrap;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .26s var(--ease),background-color .2s ease,border-color .2s ease,color .2s ease;
}
.btn--primary{background:linear-gradient(118deg,var(--blue),#5e9dff 52%,var(--magenta));color:#fff;box-shadow:0 16px 34px -18px rgba(47,123,255,.95)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 22px 40px -18px rgba(255,63,164,.8)}
.btn--ghost{background:rgba(199,206,219,.06);border-color:var(--line-strong);color:var(--ice)}
.btn--ghost:hover{border-color:var(--blue);background:rgba(47,123,255,.15);color:#fff}
.btn--sm{padding:.6rem 1.05rem;font-size:.84rem}

/* ---------- 6. 状态芯片 / 标签 ---------- */
.status-chip{
  display:inline-flex;align-items:center;gap:.42rem;
  padding:.34rem .72rem;border-radius:var(--pill);
  border:1px solid var(--line);background:rgba(199,206,219,.05);
  font-size:.75rem;color:var(--silver);letter-spacing:.02em;line-height:1.4;
}
.status-chip__dot{width:.5rem;height:.5rem;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px rgba(79,224,176,.16);animation:chipPulse 2.8s ease-in-out infinite}
.status-chip--live{color:var(--mint);border-color:rgba(79,224,176,.36);background:rgba(79,224,176,.09)}
.status-chip--mono{font-family:var(--font-mono);letter-spacing:.09em}
@keyframes chipPulse{50%{box-shadow:0 0 0 9px rgba(79,224,176,.04)}}

.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.28rem .68rem;border-radius:var(--pill);border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--silver);
}
.tag--blue{color:#d3e4ff;border-color:rgba(47,123,255,.5);background:rgba(47,123,255,.16)}
.tag--magenta{color:#ffd7ea;border-color:rgba(255,63,164,.5);background:rgba(255,63,164,.16)}
.tag--mint{color:#ccfff1;border-color:rgba(79,224,176,.5);background:rgba(79,224,176,.14)}
.tag--orange{color:#ffe4c9;border-color:rgba(255,159,69,.5);background:rgba(255,159,69,.14)}

/* ---------- 7. 信息岛 / 网格 / 数据 ---------- */
.panel{
  position:relative;overflow:hidden;
  padding:clamp(1.1rem,2.4vw,1.8rem);
  border-radius:var(--radius-md);border:1px solid var(--line);
  background:var(--surface-1);
}
.panel::before{
  content:"";position:absolute;top:0;right:0;width:46px;height:46px;pointer-events:none;
  background:linear-gradient(225deg,rgba(47,123,255,.6),rgba(255,63,164,0) 74%);
  clip-path:polygon(100% 0,0 0,100% 100%);
}
.panel--glow{border-color:rgba(47,123,255,.38);box-shadow:var(--shadow-island)}
.panel--accent{background:var(--surface-2)}
.panel__lead{color:var(--silver);font-size:.94rem;line-height:1.8}

.grid{display:grid;gap:clamp(1rem,2.2vw,1.6rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(258px,1fr))}

.stat{display:flex;flex-direction:column;gap:.3rem}
.stat__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(1.6rem,3.2vw,2.3rem);line-height:1.1;color:var(--ice);letter-spacing:-.01em}
.stat__label{font-size:.8rem;color:var(--silver);letter-spacing:.05em}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs{margin-block:1.1rem .2rem}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-family:var(--font-mono);font-size:.71rem;letter-spacing:.09em;color:rgba(199,206,219,.72)}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";margin-inline-end:.5rem;color:rgba(199,206,219,.32)}
.breadcrumbs__item a{transition:color .2s ease}
.breadcrumbs__item a:hover{color:var(--blue)}
.breadcrumbs__item[aria-current="page"]{color:var(--ice)}

/* ---------- 9. 图像容器（供页面阶段放图片占位） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;border-radius:var(--radius-md);border:1px solid var(--line);
  background:linear-gradient(150deg,#0E1B2E,#070A12 56%,rgba(122,92,255,.35));
}
.media-frame img,.media-frame video{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame__cap{
  position:absolute;inset-inline:0;bottom:0;padding:.7rem 1rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.09em;color:var(--silver);
  background:linear-gradient(180deg,transparent,rgba(7,10,18,.9));
}
.media-frame__placeholder{
  display:grid;place-items:center;height:100%;padding:1rem;text-align:center;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:rgba(199,206,219,.5);
}

/* ---------- 10. 页头 ---------- */
.skip-link{
  position:fixed;top:.6rem;left:.6rem;z-index:99;
  padding:.62rem 1rem;border-radius:12px;
  background:var(--ice);color:#06101f;font-weight:700;font-size:.85rem;
  transform:translateY(-180%);transition:transform .22s var(--ease);
}
.skip-link:focus{transform:none}

.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(7,10,18,.86);
  backdrop-filter:blur(18px) saturate(150%);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;pointer-events:none}
.scroll-progress span{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--blue),var(--magenta),var(--orange));
}

.status-strip{
  max-height:120px;overflow:hidden;
  background:linear-gradient(90deg,rgba(26,34,51,.92),rgba(14,27,46,.72));
  border-bottom:1px solid var(--line);
  transition:max-height .32s var(--ease),opacity .22s ease,border-color .22s ease;
}
.status-strip__inner{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  min-height:48px;padding-block:.45rem;
}
.status-readout{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;max-width:none}

.brand{display:inline-flex;align-items:center;gap:.7rem;flex:none}
.brand__mark{
  position:relative;width:36px;height:36px;flex:none;border-radius:11px;
  background:conic-gradient(from 210deg,var(--blue),var(--violet),var(--magenta),var(--blue));
  box-shadow:0 10px 24px -12px rgba(47,123,255,.95);
}
.brand__mark i{position:absolute;inset:4px;border-radius:8px;background:var(--bg);display:block}
.brand__mark i::after{content:"";position:absolute;inset:6px;border-radius:4px;background:linear-gradient(140deg,var(--ice),var(--blue))}
.brand__text{display:flex;flex-direction:column;line-height:1.16}
.brand__name{font-size:1.02rem;font-weight:800;letter-spacing:.02em;color:var(--ice)}
.brand__sub{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.2em;color:var(--silver);opacity:.72}
.brand--footer{margin-bottom:.2rem}

.nav-bar{
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(14,27,46,.55),rgba(7,10,18,.35));
}
.nav-bar__inner{display:flex;align-items:center;gap:1rem;min-height:66px;padding-block:.3rem}

.site-nav{display:flex;align-items:center;justify-content:space-between;gap:1.2rem;flex:1 1 auto;min-width:0}
.site-nav__list{display:flex;align-items:center;gap:.12rem;flex-wrap:wrap}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;display:inline-flex;align-items:center;gap:.42rem;
  padding:.55rem .78rem;border-radius:var(--pill);
  font-size:.92rem;color:var(--silver);white-space:nowrap;
  transition:color .2s ease,background-color .2s ease,box-shadow .25s ease;
}
.site-nav__link:hover{color:var(--ice);background:rgba(47,123,255,.13)}
.site-nav__link[aria-current="page"]{
  color:#fff;
  background:linear-gradient(120deg,rgba(47,123,255,.30),rgba(255,63,164,.22));
  box-shadow:inset 0 0 0 1px rgba(47,123,255,.5);
}
.site-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:-8px;width:22px;height:2px;border-radius:2px;
  transform:translateX(-50%);background:linear-gradient(90deg,var(--blue),var(--magenta));
}
.site-nav__index{font-family:var(--font-mono);font-size:.6rem;color:var(--blue);opacity:.9}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--ice)}
.site-nav__pills{display:flex;align-items:center;gap:.5rem;flex:none}

.nav-toggle{
  display:none;align-items:center;gap:.6rem;flex:none;
  padding:.5rem .85rem;border-radius:var(--pill);
  border:1px solid var(--line-strong);color:var(--ice);font-size:.82rem;
  transition:border-color .2s ease,background-color .2s ease;
}
.nav-toggle:hover{border-color:var(--blue);background:rgba(47,123,255,.14)}
.nav-toggle__label{letter-spacing:.08em}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:var(--ice);transition:transform .26s var(--ease),opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

html[data-scrolled="true"] .status-strip{max-height:0;opacity:0;border-color:transparent}
html[data-scrolled="true"] .nav-bar{background:linear-gradient(90deg,rgba(14,27,46,.92),rgba(7,10,18,.86))}
html[data-scrolled="true"] .nav-bar__inner{min-height:58px}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(2.5rem,6vw,5rem);
  padding:clamp(2.2rem,5vw,3.4rem) 0 1.6rem;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(14,27,46,.6),rgba(7,10,18,1) 62%);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;opacity:.75;
  background:linear-gradient(90deg,transparent,var(--blue),var(--magenta),transparent);
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.5fr;gap:clamp(1.6rem,3vw,2.4rem)}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start}
.footer-note{margin-top:1rem;font-size:.9rem;line-height:1.78;color:var(--silver);max-width:36ch}
.footer-badges{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:1.05rem}
.footer-nav__title{
  margin-bottom:.95rem;font-family:var(--font-mono);font-size:.72rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--ice);
}
.footer-nav__list{display:flex;flex-direction:column;gap:.55rem}
.footer-nav__link{display:inline-flex;align-items:baseline;gap:.55rem;font-size:.9rem;color:var(--silver);transition:color .2s ease,transform .2s ease}
.footer-nav__link:hover{color:var(--blue);transform:translateX(3px)}
.footer-nav__num{font-family:var(--font-mono);font-size:.64rem;color:rgba(199,206,219,.45)}
.footer-contact__list{display:flex;flex-direction:column;gap:.8rem}
.footer-contact__item{display:flex;flex-direction:column;gap:.16rem}
.footer-contact__key{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--blue)}
.footer-contact__value{font-size:.9rem;line-height:1.68;color:var(--ice);word-break:break-word}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.8rem 1.4rem;
  margin-top:clamp(1.8rem,4vw,2.6rem);padding-top:1.2rem;border-top:1px solid var(--line);
}
.footer-legal{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.05em;color:rgba(199,206,219,.7)}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:1rem;font-size:.8rem;color:var(--silver)}
.footer-legal__links a{transition:color .2s ease}
.footer-legal__links a:hover{color:var(--magenta)}

/* ---------- 12. 滚动显现 ---------- */
.reveal{transition:opacity .62s var(--ease),transform .62s var(--ease);transition-delay:var(--reveal-delay,0ms)}
html.js-reveal .reveal{opacity:0;transform:translate3d(26px,14px,0)}
html.js-reveal .reveal.is-visible{opacity:1;transform:none}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1180px){
  .site-nav__link{padding:.5rem .62rem;font-size:.88rem}
}
@media (max-width:1080px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:980px){
  :root{--header-h:106px}
  .status-strip__inner{min-height:44px}
  .status-chip--mono:last-child{display:none}
  .nav-bar__inner{min-height:58px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;inset-inline:0;top:var(--header-h);
    flex-direction:column;align-items:stretch;gap:1.1rem;
    padding:1.2rem clamp(1rem,4vw,2rem) 1.7rem;
    background:linear-gradient(180deg,rgba(7,10,18,.985),rgba(14,27,46,.985));
    border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-deep);
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-14px);
    transition:opacity .24s ease,transform .3s var(--ease),visibility .24s ease;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:.2rem;width:100%}
  .site-nav__item{width:100%}
  .site-nav__link{width:100%;padding:.9rem 1rem;border-radius:14px;font-size:1rem;justify-content:flex-start}
  .site-nav__link[aria-current="page"]::after{left:1rem;bottom:8px;width:26px;transform:none}
  .site-nav__pills{flex-direction:column;align-items:stretch;width:100%}
  .site-nav__pills .btn{width:100%}
}
@media (max-width:860px){
  .grid--2,.grid--3{grid-template-columns:1fr}
}
@media (max-width:640px){
  :root{--header-h:100px}
  body{font-size:15.5px}
  .grid--auto{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:1.8rem}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .brand__sub{letter-spacing:.14em}
  .status-chip--mono{display:none}
  .status-chip--mono:last-child{display:none}
  .btn{padding:.78rem 1.15rem;font-size:.9rem}
}
html[data-scrolled="true"]{--header-h:64px}

/* ---------- 14. 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;
    transition-delay:0ms !important;
  }
  html.js-reveal .reveal{opacity:1;transform:none}
}