/* ============================================================
   HAHABET 中文专区 · 共享层样式 / assets/site.css
   终端档案室：深海墨蓝暗场 + 霓虹青 / 电光紫 / 琥珀金 信号层
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 24px)}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
input,textarea,select{font:inherit}
table{border-collapse:collapse}
hr{border:0}

/* ---------- tokens ---------- */
:root{
  --ink:#071426;
  --ink-2:#0B1F38;
  --panel:#102A47;
  --cyan:#18E0D0;
  --violet:#7C4DFF;
  --amber:#FFB23E;
  --fog:#E6F4FF;
  --steel:#8FA9C4;
  --coral:#FF7A6E;
  --line:rgba(24,224,208,.28);
  --line-soft:rgba(143,169,196,.18);
  --shadow-neon:0 0 0 1px rgba(24,224,208,.32),0 20px 46px -28px rgba(24,224,208,.7);

  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Noto Sans Mono",ui-monospace,monospace;

  --shell:1200px;
  --shell-wide:1340px;
  --header-h:74px;

  --r-s:8px;
  --r-m:14px;
  --r-l:24px;
  --ease:cubic-bezier(.22,.8,.28,1);
}

/* ---------- base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1120px 560px at 10% -8%,rgba(124,77,255,.22),transparent 62%),
    radial-gradient(880px 520px at 92% 2%,rgba(24,224,208,.14),transparent 64%),
    linear-gradient(180deg,rgba(11,31,56,.55) 0%,rgba(7,20,38,0) 46%);
  background-repeat:no-repeat;
  color:var(--fog);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.9;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
main{display:block}
h1,h2,h3,h4{line-height:1.28;letter-spacing:-.02em;font-weight:800;color:var(--fog)}
h1{font-size:clamp(34px,5vw,58px)}
h2{font-size:clamp(24px,3.2vw,33px)}
h3{font-size:clamp(19px,2.1vw,23px);font-weight:700}
p{color:#CADDF1}
strong{color:var(--fog)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
#main-content{outline:none}

.mono{font-family:var(--font-mono);letter-spacing:.04em}
.text-cyan{color:var(--cyan)}
.text-amber{color:var(--amber)}
.text-violet{color:var(--violet)}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:14px;top:-90px;z-index:200;
  padding:10px 18px;border-radius:999px;
  background:var(--cyan);color:#04121f;font-weight:700;font-size:14px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,rgba(7,20,38,.97),rgba(7,20,38,.84));
  backdrop-filter:blur(16px) saturate(1.25);
  -webkit-backdrop-filter:blur(16px) saturate(1.25);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  width:100%;max-width:var(--shell-wide);margin-inline:auto;
  padding:10px clamp(16px,3vw,34px);
  min-height:var(--header-h);
}

/* brand */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{
  width:30px;height:30px;flex:0 0 auto;
  display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:3px;
}
.brand-mark span{border-radius:3px;background:var(--cyan);box-shadow:0 0 10px rgba(24,224,208,.45)}
.brand-mark span:nth-child(2){background:var(--violet);box-shadow:0 0 10px rgba(124,77,255,.5)}
.brand-mark span:nth-child(3){background:var(--violet);opacity:.62;box-shadow:none}
.brand-mark span:nth-child(4){background:var(--amber);box-shadow:0 0 10px rgba(255,178,62,.45)}
.brand-text{display:grid;line-height:1.2}
.brand-name{font-size:18px;font-weight:800;letter-spacing:-.02em;color:var(--fog)}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.1em;color:var(--steel);
  white-space:nowrap;
}
.brand:hover .brand-name{color:var(--cyan)}

/* nav toggle */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 15px;border:1px solid var(--line);border-radius:999px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.1em;color:var(--fog);
  cursor:pointer;transition:.24s var(--ease);
}
.nav-toggle:hover{background:rgba(24,224,208,.1);box-shadow:0 0 0 1px rgba(24,224,208,.4)}
.nav-toggle-bars{display:grid;gap:4px;width:16px}
.nav-toggle-bars i{display:block;height:2px;background:var(--cyan);border-radius:2px;transition:transform .26s var(--ease),opacity .2s}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child{transform:translateY(-3px) rotate(-45deg)}

/* nav */
.primary-nav{display:flex;align-items:center;gap:clamp(8px,1.6vw,24px)}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 11px;border-radius:var(--r-s);
  font-size:15px;color:var(--steel);
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.nav-idx{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--cyan);opacity:.72}
.nav-link:hover{color:var(--fog);background:rgba(24,224,208,.08)}
.nav-link:hover .nav-idx{opacity:1}
.nav-link[aria-current="page"]{
  color:var(--fog);background:rgba(24,224,208,.12);
  box-shadow:inset 0 -2px 0 var(--cyan);
}
.nav-link[aria-current="page"] .nav-idx{color:var(--amber);opacity:1}

.nav-actions{
  display:flex;align-items:center;gap:10px;
  padding-left:clamp(10px,1.4vw,20px);
  border-left:1px solid var(--line-soft);
}

/* scroll progress */
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(143,169,196,.12);pointer-events:none;
}
.scroll-progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--violet) 58%,var(--amber) 100%);
  box-shadow:0 0 12px rgba(24,224,208,.7);
  transition:width .1s linear;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:999px;border:1px solid transparent;
  font-size:14.5px;font-weight:600;line-height:1.2;white-space:nowrap;cursor:pointer;
  transition:transform .25s var(--ease),background-color .25s var(--ease),box-shadow .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.btn-sm{padding:9px 15px;font-size:13.5px}
.btn-ghost{border-color:var(--line);color:var(--fog);background:rgba(24,224,208,.06)}
.btn-ghost:hover{background:rgba(24,224,208,.15);box-shadow:0 0 0 1px rgba(24,224,208,.5);transform:translateY(-1px)}
.btn-solid{background:linear-gradient(120deg,var(--cyan) 0%,#4FD0FF 46%,var(--violet) 100%);color:#04121f;font-weight:700}
.btn-solid:hover{transform:translateY(-2px);box-shadow:0 16px 34px -16px rgba(24,224,208,.8)}
.btn:active{transform:translateY(0)}

/* ---------- layout ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,40px)}
.container-wide{width:100%;max-width:var(--shell-wide);margin-inline:auto;padding-inline:clamp(18px,4vw,40px)}
.section{padding-block:clamp(44px,6.5vw,90px)}
.section-tight{padding-block:clamp(28px,4vw,52px)}
.divider{height:1px;background:linear-gradient(90deg,var(--line),rgba(24,224,208,0));border:0;margin-block:clamp(24px,3vw,40px)}
.page-shell{padding-top:clamp(28px,4vw,56px)}

.grid{display:grid;gap:clamp(16px,2.3vw,28px)}
.grid-7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid-8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.grid-4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.grid-6{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ---------- section head ---------- */
.section-head{display:grid;gap:10px;max-width:74ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  color:var(--cyan);text-transform:uppercase;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);opacity:.7}
.section-title{font-size:clamp(24px,3.2vw,33px)}
.section-desc{color:var(--steel);font-size:16px;line-height:1.9;max-width:64ch}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{padding-block:14px 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--steel)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item+.breadcrumb-item::before{content:"/";color:rgba(24,224,208,.5)}
.breadcrumb-item a{color:var(--steel)}
.breadcrumb-item a:hover{color:var(--cyan)}
.breadcrumb-item.is-current{color:var(--fog)}
.breadcrumb-item [aria-current="page"]{color:var(--amber)}

/* ---------- card ---------- */
.card{
  position:relative;
  background:linear-gradient(158deg,rgba(16,42,71,.92),rgba(11,31,56,.76));
  border:1px solid var(--line-soft);
  border-radius:var(--r-m);
  padding:clamp(18px,2.4vw,26px);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:var(--line);box-shadow:var(--shadow-neon)}
.card-head{display:flex;align-items:baseline;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:10px}
.card-title{font-size:19px;font-weight:700;letter-spacing:-.01em}
.card-meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--steel)}

/* ---------- tag / filter ---------- */
.tag{
  display:inline-flex;align-items:center;
  padding:4px 11px;border-radius:999px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--cyan);background:rgba(24,224,208,.1);border:1px solid var(--line);
}
.tag-amber{color:var(--amber);background:rgba(255,178,62,.1);border-color:rgba(255,178,62,.32)}
.tag-violet{color:#C6B4FF;background:rgba(124,77,255,.16);border-color:rgba(124,77,255,.4)}
.filter-bar{display:flex;flex-wrap:wrap;gap:10px}
.tag-filter{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  padding:8px 15px;border-radius:999px;cursor:pointer;
  color:var(--steel);background:rgba(16,42,71,.6);border:1px solid var(--line-soft);
  transition:.24s var(--ease);
}
.tag-filter:hover{color:var(--fog);border-color:var(--line)}
.tag-filter[aria-pressed="true"]{
  color:#04121f;font-weight:700;border-color:transparent;
  background:linear-gradient(120deg,var(--cyan),var(--violet));
  box-shadow:0 10px 26px -14px rgba(24,224,208,.9);
}

/* ---------- image frame ---------- */
.img-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border-radius:var(--r-m);border:1px solid var(--line-soft);
  background:
    radial-gradient(420px 220px at 20% 10%,rgba(24,224,208,.14),transparent 70%),
    linear-gradient(150deg,var(--ink-2),var(--panel));
}
.img-frame::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:linear-gradient(rgba(24,224,208,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(24,224,208,.06) 1px,transparent 1px);
  background-size:28px 28px;opacity:.7;
}
.img-frame::after{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:linear-gradient(180deg,rgba(7,20,38,0) 42%,rgba(7,20,38,.74) 100%);
}
.img-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06)}
.img-frame--16-9{aspect-ratio:16/9}
.img-frame--3-2{aspect-ratio:3/2}
.img-frame--4-5{aspect-ratio:4/5}
.img-frame--1-1{aspect-ratio:1/1}
.img-frame--free{aspect-ratio:auto;min-height:220px}

/* ---------- prose ---------- */
.prose{max-width:68ch;font-size:17px;line-height:1.95;color:#CADDF1}
.prose h2{margin-top:clamp(28px,3.6vw,44px);margin-bottom:12px}
.prose h3{margin-top:24px;margin-bottom:8px}
.prose p+p{margin-top:14px}
.prose ul,.prose ol{margin-top:12px;display:grid;gap:8px}
.prose ul>li,.prose ol>li{position:relative;padding-left:20px}
.prose ul>li::before{content:"";position:absolute;left:2px;top:.85em;width:6px;height:6px;border-radius:2px;background:var(--cyan);opacity:.85}
.prose ol{counter-reset:prose}
.prose ol>li{counter-increment:prose}
.prose ol>li::before{content:counter(prose,decimal-leading-zero);position:absolute;left:0;top:0;font-family:var(--font-mono);font-size:12px;color:var(--amber)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(24,224,208,.4)}
.prose a:hover{border-bottom-color:var(--cyan)}

/* ---------- reveal protocol ---------- */
.js-reveal .reveal{opacity:0;transform:translateY(16px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
.js-reveal .reveal.is-visible{opacity:1;transform:none}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  padding-block:clamp(40px,5vw,72px) clamp(20px,2.6vw,30px);
  background:linear-gradient(180deg,rgba(11,31,56,.92) 0%,#050E1B 72%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 52%,var(--amber) 100%);
  opacity:.8;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) repeat(5,minmax(0,1fr));
  gap:clamp(22px,2.6vw,36px) clamp(18px,2vw,28px);
  align-items:start;
}
.footer-brand{display:grid;gap:12px;max-width:44ch}
.footer-brand-line{font-size:16px;font-weight:700;color:var(--fog);letter-spacing:-.01em;line-height:1.7}
.footer-note{font-size:13.5px;line-height:1.85;color:var(--steel)}
.footer-stamp{
  font-size:12px;letter-spacing:.06em;color:var(--steel);
  display:inline-flex;align-items:center;gap:9px;flex-wrap:wrap;
}
.footer-stamp .mono{
  color:var(--cyan);font-size:11px;letter-spacing:.16em;
  padding:3px 9px;border:1px solid var(--line);border-radius:999px;
}
.footer-col-title{
  display:flex;align-items:baseline;gap:8px;
  font-size:13.5px;font-weight:700;letter-spacing:.04em;color:var(--fog);
  margin-bottom:13px;
}
.footer-col-idx{font-family:var(--font-mono);font-size:11px;color:var(--cyan);opacity:.85}
.footer-list{display:grid;gap:9px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:var(--steel);
  transition:color .2s var(--ease);
}
.footer-link::before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:rgba(24,224,208,.42);flex:0 0 auto;
  transition:transform .2s var(--ease),background-color .2s var(--ease);
}
.footer-link:hover{color:var(--cyan)}
.footer-link:hover::before{background:var(--amber);transform:scale(1.5)}

.footer-contact .contact-list{display:grid;gap:11px}
.contact-item{display:grid;gap:2px}
.contact-key{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);opacity:.82}
.contact-val{font-size:13.5px;line-height:1.7;color:var(--steel);word-break:break-word}

.footer-legal{
  margin-top:clamp(30px,4vw,50px);
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 26px;
}
.legal-list{display:flex;flex-wrap:wrap;gap:10px 22px}
.legal-link{font-size:13px;color:var(--steel);transition:color .2s var(--ease)}
.legal-link:hover{color:var(--cyan)}
.footer-icp{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--steel);opacity:.85}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1;max-width:60ch}
}
@media (max-width:1079px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:var(--header-h);right:0;bottom:0;
    width:min(400px,88vw);
    display:flex;flex-direction:column;align-items:stretch;
    gap:20px;padding:26px 22px 40px;overflow-y:auto;
    background:linear-gradient(180deg,rgba(11,31,56,.99),rgba(7,20,38,.99));
    border-left:1px solid var(--line);
    box-shadow:-30px 0 60px -40px rgba(0,0,0,.95);
    transform:translateX(103%);
    transition:transform .34s var(--ease);
    z-index:70;
  }
  .primary-nav[data-open="true"]{transform:translateX(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;justify-content:flex-start;
    padding:14px 12px;border-radius:0;font-size:16.5px;
    border-bottom:1px solid var(--line-soft);
  }
  .nav-link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--cyan);background:rgba(24,224,208,.1)}
  .nav-actions{flex-direction:column;align-items:stretch;gap:12px;margin-top:auto;padding-left:0;border-left:0}
  .nav-actions .btn{width:100%}
}
@media (max-width:900px){
  .grid-7-5,.grid-8-4,.grid-4-8{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  body{font-size:16px;line-height:1.85}
  :root{--header-h:66px}
  .brand-sub{display:none}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

/* ---------- motion / contrast preferences ---------- */
@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;
  }
  .js-reveal .reveal{opacity:1;transform:none}
  .card:hover,.btn:hover{transform:none}
  .img-frame img{filter:none}
  .scroll-progress span{transition:none}
}
@media (prefers-contrast:more){
  :root{--steel:#B7CEE6;--line-soft:rgba(183,206,230,.4)}
  .footer-link,.section-desc,.contact-val,.prose{color:#DCEBF8}
}