/* ===== 01 变量 ===== */
:root{
  --c-bg:#0A0F2C;
  --c-panel:#131A3F;
  --c-band:#1B2A6B;
  --c-line:#2A3566;
  --c-white:#F4F7FF;
  --c-text:#C9D2F0;
  --c-muted:#8A94BE;
  --c-cyan:#35E6E0;
  --c-magenta:#FF3FA4;
  --c-gold:#E8B45A;
  --shell-max:1280px;
  --gap:24px;
  --header-h:88px;
  --header-h-compact:54px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
@media (max-width:1023px){
  :root{--header-h:64px;--header-h-compact:48px;}
}

/* ===== 02 RESET 与基础排版 ===== */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.7;
  background-image:
    linear-gradient(rgba(42,53,102,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,53,102,.16) 1px,transparent 1px);
  background-size:76px 76px;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;}
table{border-collapse:collapse;width:100%;}
[hidden]{display:none!important;}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;}

h1,.h1{font-size:clamp(2.4rem,6.4vw,5.2rem);font-weight:250;line-height:1.04;letter-spacing:-.01em;color:var(--c-white);text-shadow:0 0 1px rgba(53,230,224,.85),0 0 28px rgba(53,230,224,.2);}
h2,.h2{font-size:clamp(1.5rem,3vw,2.4rem);font-weight:400;line-height:1.18;letter-spacing:-.005em;color:var(--c-white);}
h3,.h3{font-size:clamp(1.08rem,1.5vw,1.32rem);font-weight:600;line-height:1.35;color:var(--c-white);}

/* ===== 03 通用工具 ===== */
.shell{width:100%;max-width:var(--shell-max);margin:0 auto;padding:0 clamp(16px,4vw,40px);}
main{position:relative;z-index:1;padding-top:var(--header-h);}
.sr-only{position:absolute;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:.04em;}
.skip-link{position:absolute;left:16px;top:-72px;z-index:90;padding:12px 18px;background:var(--c-cyan);color:var(--c-bg);font-size:.68rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;transition:top .2s var(--ease);}
.skip-link:focus{top:12px;}

/* ===== 04 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 22px;font-size:.68rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;border:1px solid var(--c-line);color:var(--c-white);background:transparent;cursor:pointer;transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease),transform .22s var(--ease);}
.btn:hover{transform:translateY(-2px);}
.btn-neon{border-color:var(--c-cyan);color:var(--c-cyan);}
.btn-neon:hover{background:var(--c-cyan);color:var(--c-bg);box-shadow:0 14px 30px -18px rgba(53,230,224,.9);}
.btn-solid{background:var(--c-cyan);border-color:var(--c-cyan);color:var(--c-bg);}
.btn-solid:hover{box-shadow:0 14px 32px -18px rgba(53,230,224,.95);}
.btn-ghost{color:var(--c-text);}
.btn-ghost:hover{border-color:var(--c-cyan);color:var(--c-white);}
.btn-sm{padding:9px 14px;font-size:.6rem;letter-spacing:.16em;}

/* ===== 05 头部 ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  background:linear-gradient(180deg,rgba(10,15,44,.78),rgba(10,15,44,0));
  border-bottom:1px solid transparent;
  transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}
.site-header[data-scrolled]{
  background:rgba(10,15,44,.94);
  border-bottom-color:var(--c-line);
  box-shadow:0 20px 44px -36px rgba(53,230,224,.6);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}
.site-header[data-open]{
  background:rgba(10,15,44,.98);
  border-bottom-color:var(--c-line);
}
.header-inner{display:flex;align-items:center;gap:18px;min-height:var(--header-h);transition:min-height .3s var(--ease);}
.site-header[data-scrolled] .header-inner{min-height:var(--header-h-compact);}
.site-header[data-open] .header-inner{min-height:var(--header-h);}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-magenta));
  transform:scaleX(var(--progress,0));transform-origin:left center;
  transition:transform .15s linear;
}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto;padding:6px 0;color:var(--c-white);}
.brand-mark{position:relative;flex:0 0 34px;width:34px;height:34px;border:1px solid var(--c-line);background:linear-gradient(135deg,rgba(53,230,224,.18),rgba(255,63,164,.16));box-shadow:0 0 24px -12px rgba(53,230,224,.8);}
.brand-mark::before{content:"";position:absolute;inset:9px;border:1px solid var(--c-cyan);transform:rotate(45deg);opacity:.9;}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1.1;}
.brand-name{font-size:1.02rem;font-weight:600;letter-spacing:.08em;}
.brand-descriptor{font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--c-muted);}
.nav-toggle{display:none;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--c-line);color:var(--c-white);cursor:pointer;transition:border-color .2s var(--ease);}
.nav-toggle:hover{border-color:var(--c-cyan);}
.nav-toggle-label{font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--c-text);}
.nav-toggle-bars{position:relative;display:inline-block;width:18px;height:10px;}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;width:18px;height:1px;background:var(--c-cyan);transition:transform .25s var(--ease);}
.nav-toggle-bars::before{top:0;}
.nav-toggle-bars::after{bottom:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(4.5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-4.5px) rotate(-45deg);}
.site-nav{display:flex;align-items:center;gap:10px;}
.nav-list{display:flex;align-items:center;gap:2px;}
.nav-link{position:relative;display:inline-block;padding:10px 12px;font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--c-text);transition:color .2s var(--ease);}
.nav-link::after{content:"";position:absolute;left:12px;right:12px;bottom:4px;height:1px;background:var(--c-cyan);transform:scaleX(0);transform-origin:left center;transition:transform .25s var(--ease);}
.nav-link:hover{color:var(--c-white);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--c-cyan);}
.nav-link[aria-current="page"]::after{transform:scaleX(1);}
.nav-utility{display:none;align-items:center;gap:12px;padding-left:14px;border-left:1px solid var(--c-line);}
.nav-utility-label{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.22em;text-transform:uppercase;color:var(--c-gold);}
.nav-utility-link{font-size:.62rem;letter-spacing:.16em;color:var(--c-muted);transition:color .2s var(--ease);}
.nav-utility-link:hover{color:var(--c-cyan);}
.nav-cta{margin-left:6px;}
@media (min-width:1120px){
  .nav-utility{display:flex;}
}
@media (max-width:1023px){
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:fixed;top:var(--header-h);left:0;right:0;bottom:0;z-index:79;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    padding:24px clamp(16px,4vw,40px) 96px;
    background:rgba(10,15,44,.98);
    border-top:1px solid var(--c-line);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s var(--ease);
    -webkit-backdrop-filter:blur(16px);
    backdrop-filter:blur(16px);
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:none;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-link{display:block;padding:16px 0;border-bottom:1px solid rgba(42,53,102,.7);font-size:.86rem;letter-spacing:.16em;}
  .nav-link::after{display:none;}
  .nav-link[aria-current="page"]{padding-left:14px;box-shadow:inset 2px 0 0 var(--c-cyan);}
  .nav-utility{display:flex;flex-wrap:wrap;padding:20px 0 0;border-left:0;border-top:0;}
  .nav-cta{margin:24px 0 0;align-self:flex-start;}
  html.is-nav-open{overflow:hidden;}
}

/* ===== 06 页脚 ===== */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(64px,9vw,140px);
  border-top:1px solid var(--c-line);
  background:linear-gradient(180deg,rgba(19,26,63,.65),rgba(10,15,44,1) 62%);
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:var(--gap);padding:clamp(44px,6vw,84px) 0 clamp(28px,4vw,48px);}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr repeat(3,1fr);}}
.footer-brand{display:flex;flex-direction:column;gap:12px;max-width:38ch;}
.footer-mark{position:relative;width:40px;height:40px;border:1px solid var(--c-line);background:linear-gradient(135deg,rgba(53,230,224,.2),rgba(255,63,164,.16));}
.footer-mark::after{content:"";position:absolute;inset:11px;border:1px solid var(--c-cyan);transform:rotate(45deg);}
.footer-brand-name{font-size:1.15rem;font-weight:600;letter-spacing:.08em;color:var(--c-white);}
.footer-descriptor{font-size:.64rem;letter-spacing:.2em;text-transform:uppercase;color:var(--c-muted);}
.footer-note{font-size:.88rem;line-height:1.8;color:var(--c-text);}
.footer-col{display:flex;flex-direction:column;gap:14px;}
.footer-col-title{font-size:.62rem;font-weight:600;letter-spacing:.24em;text-transform:uppercase;color:var(--c-gold);}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-link{display:inline-block;font-size:.88rem;color:var(--c-text);transition:color .2s var(--ease),transform .2s var(--ease);}
.footer-link:hover{color:var(--c-cyan);transform:translateX(4px);}
.footer-contact{display:grid;gap:14px;padding:clamp(24px,3vw,36px) 0;border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);}
@media (min-width:900px){.footer-contact{grid-template-columns:200px 1fr;align-items:start;gap:24px;}}
.footer-contact-title{font-size:.62rem;letter-spacing:.24em;text-transform:uppercase;color:var(--c-muted);}
.footer-contact-list{display:flex;flex-wrap:wrap;gap:10px 34px;}
.footer-contact-item{display:flex;align-items:baseline;gap:10px;font-size:.88rem;}
.footer-contact-label{font-size:.58rem;letter-spacing:.2em;text-transform:uppercase;color:var(--c-muted);}
.footer-contact-value{color:var(--c-white);font-variant-numeric:tabular-nums;}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;padding:26px 0 34px;}
.footer-legal-text{font-size:.72rem;letter-spacing:.1em;color:var(--c-muted);}
.service-bar{border-top:1px solid var(--c-line);background:linear-gradient(90deg,rgba(27,42,107,.75),rgba(19,26,63,.92));}
.service-bar-inner{display:flex;align-items:center;flex-wrap:wrap;gap:16px;padding:14px 0;}
.service-bar-text{display:flex;align-items:center;gap:10px;margin-right:auto;font-size:.8rem;color:var(--c-text);}
.service-bar-text::before{content:"";flex:0 0 8px;width:8px;height:8px;background:var(--c-cyan);box-shadow:0 0 12px rgba(53,230,224,.85);}
.service-bar-actions{display:flex;align-items:center;gap:10px;}
@media (max-width:720px){
  .service-bar{
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    border-top:1px solid var(--c-line);
    background:rgba(10,15,44,.97);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    padding-bottom:env(safe-area-inset-bottom,0px);
  }
  .service-bar-inner{padding:11px 0;gap:10px;}
  .service-bar-text{flex:1 1 100%;margin-right:0;font-size:.72rem;}
  .service-bar-actions{width:100%;}
  .site-footer{padding-bottom:104px;}
}

/* ===== 07 区块与文本 ===== */
.section{position:relative;padding:clamp(48px,7vw,110px) 0;}
.section-head{display:grid;gap:14px;max-width:64ch;margin-bottom:clamp(26px,3.5vw,52px);}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.62rem;letter-spacing:.24em;text-transform:uppercase;color:var(--c-cyan);}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--c-cyan);}
.lead{max-width:62ch;font-size:clamp(1rem,1.15vw,1.12rem);line-height:1.85;color:var(--c-text);}
.index-num{display:block;margin-bottom:12px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;color:var(--c-cyan);}
.prose{max-width:68ch;color:var(--c-text);}
.prose p{margin-bottom:1.1em;}
.prose h2,.prose h3{margin:1.8em 0 .6em;color:var(--c-white);}
.prose ul{list-style:disc;padding-left:1.3em;margin-bottom:1.1em;}
.prose li{margin-bottom:.5em;}
.prose a{color:var(--c-cyan);border-bottom:1px solid rgba(53,230,224,.4);}
.page-head{position:relative;padding:clamp(40px,6vw,88px) 0 clamp(26px,3vw,40px);border-bottom:1px solid var(--c-line);}
.page-head .lead{margin-top:18px;}
.hero-bleed{margin-top:calc(-1 * var(--header-h));padding-top:calc(var(--header-h) + clamp(36px,7vw,86px));}
.breadcrumbs{padding:18px 0;}
.breadcrumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.breadcrumb-item{font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:var(--c-muted);}
.breadcrumb-item a{color:inherit;transition:color .2s var(--ease);}
.breadcrumb-item a:hover{color:var(--c-cyan);}
.breadcrumb-item + .breadcrumb-item::before{content:"/";margin-right:8px;color:var(--c-line);}
.breadcrumb-item[aria-current="page"]{color:var(--c-white);}

/* ===== 08 网格与 Bento 模块 ===== */
.grid{display:grid;gap:var(--gap);}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));}
.bento{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap);}
.bento > *{grid-column:span 12;}
@media (min-width:768px){
  .span-3{grid-column:span 3;}
  .span-4{grid-column:span 4;}
  .span-5{grid-column:span 5;}
  .span-6{grid-column:span 6;}
  .span-7{grid-column:span 7;}
  .span-8{grid-column:span 8;}
  .span-9{grid-column:span 9;}
  .span-12{grid-column:span 12;}
}
.panel{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:clamp(20px,2.2vw,30px);
  background:var(--c-panel);border:1px solid var(--c-line);border-radius:0;
  transition:transform .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
}
.panel:hover{transform:translateY(-4px);border-color:var(--c-cyan);box-shadow:0 22px 44px -34px rgba(53,230,224,.85);}
.panel-index{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.16em;color:var(--c-muted);}
.panel-title{font-size:1.06rem;font-weight:600;letter-spacing:.02em;color:var(--c-white);}
.panel-body{font-size:.9rem;color:var(--c-text);}

/* ===== 09 标签 ===== */
.tag{display:inline-flex;align-items:center;gap:8px;padding:5px 10px;border:1px solid var(--c-line);font-size:.6rem;letter-spacing:.18em;text-transform:uppercase;color:var(--c-text);}
.tag--cyan{border-color:rgba(53,230,224,.55);color:var(--c-cyan);}
.tag--magenta{border-color:rgba(255,63,164,.55);color:var(--c-magenta);}
.tag--gold{border-color:rgba(232,180,90,.55);color:var(--c-gold);}

/* ===== 10 筛选 ===== */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:clamp(26px,3vw,44px);padding:14px 0;border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);}
.filter-label{margin-right:6px;font-size:.6rem;letter-spacing:.22em;text-transform:uppercase;color:var(--c-muted);}
.filter-btn{padding:9px 16px;border:1px solid var(--c-line);background:transparent;font-size:.64rem;letter-spacing:.16em;text-transform:uppercase;color:var(--c-text);cursor:pointer;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);}
.filter-btn:hover{border-color:var(--c-cyan);color:var(--c-white);}
.filter-btn[aria-pressed="true"]{background:var(--c-cyan);border-color:var(--c-cyan);color:var(--c-bg);font-weight:600;}
.filter-empty{padding:26px 0;font-size:.86rem;color:var(--c-muted);}

/* ===== 11 步骤条 ===== */
.step-list{display:grid;gap:1px;background:var(--c-line);border:1px solid var(--c-line);}
.step-item{position:relative;background:var(--c-bg);transition:background .25s var(--ease);}
.step-item::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--c-cyan);transform:scaleY(0);transform-origin:top center;transition:transform .3s var(--ease);}
.step-item.is-active{background:var(--c-panel);}
.step-item.is-active::before{transform:scaleY(1);}
.step-head{display:flex;align-items:center;gap:16px;width:100%;padding:20px 22px;text-align:left;cursor:pointer;}
.step-index{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--c-cyan);}
.step-title{font-size:1rem;font-weight:600;color:var(--c-white);}
.step-hint{margin-left:auto;font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:var(--c-muted);}
.step-body{padding:0 22px 24px;font-size:.92rem;line-height:1.8;color:var(--c-text);}
@media (min-width:768px){.step-body{padding-left:60px;}}

/* ===== 12 媒体容器 ===== */
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--c-line);
  background:
    radial-gradient(120% 120% at 18% 12%,rgba(53,230,224,.16),transparent 55%),
    radial-gradient(110% 110% at 88% 92%,rgba(255,63,164,.14),transparent 58%),
    linear-gradient(140deg,var(--c-panel),var(--c-bg));
}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--portrait{aspect-ratio:3/4;}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-fallback{position:absolute;inset:0;display:grid;place-content:center;gap:8px;padding:18px;text-align:center;font-family:var(--font-mono);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--c-muted);}
.media-caption{margin-top:10px;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--c-muted);}

/* ===== 13 装饰光带 ===== */
.divider-slant{height:2px;margin:clamp(30px,5vw,70px) 0;transform:skewY(-1.2deg);background:linear-gradient(90deg,rgba(53,230,224,0),rgba(53,230,224,.75),rgba(255,63,164,.45),rgba(232,180,90,0));}
.light-band{position:absolute;left:-10%;right:-10%;height:1px;pointer-events:none;background:linear-gradient(90deg,rgba(53,230,224,0),rgba(53,230,224,.5),rgba(255,63,164,.35),rgba(53,230,224,0));transform:rotate(-5deg);animation:band-drift 12s ease-in-out infinite alternate;}
@keyframes band-drift{
  from{transform:rotate(-5deg) translateX(-1.5%);}
  to{transform:rotate(-5deg) translateX(1.5%);}
}

/* ===== 14 入场动效 ===== */
.reveal{opacity:0;transform:translate3d(0,16px,0);transition:opacity .4s var(--ease),transform .4s var(--ease);}
.reveal.is-visible{opacity:1;transform:none;}

/* ===== 15 降级动效 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;}
  .reveal{opacity:1;transform:none;}
  .light-band{animation:none;}
  .panel:hover,.btn:hover,.footer-link:hover{transform:none;}
}