/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg{max-width:100%;display:block}

/* ===== variables ===== */
:root{
  --ink:#0B1F1A;
  --charcoal:#121417;
  --fog:#F3F6F2;
  --stand:#2A3431;
  --flame:#FF4D2E;
  --amber:#FF9A4D;
  --electric:#2E8BFF;
  --mint:#27E0C8;
  --violet:#8B7BFF;
  --line:rgba(243,246,242,.16);
  --line-strong:rgba(243,246,242,.3);
  --muted:rgba(243,246,242,.64);
  --gutter:clamp(16px,4vw,40px);
  --radius:18px;
  --radius-sm:12px;
  --shadow-panel:0 18px 50px rgba(0,0,0,.35);
  --ease:cubic-bezier(.2,.7,.2,1);
  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ===== base / 中文排版 ===== */
body{
  min-height:100vh;
  background:
    radial-gradient(120% 80% at 12% -12%,rgba(255,77,46,.16),transparent 55%),
    radial-gradient(100% 70% at 92% -4%,rgba(46,139,255,.16),transparent 58%),
    radial-gradient(80% 60% at 50% 110%,rgba(39,224,200,.08),transparent 60%),
    var(--charcoal);
  background-attachment:fixed;
  color:var(--fog);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.08;
  letter-spacing:-.01em;
  text-wrap:balance;
}
h1{font-size:clamp(2.4rem,6vw,4.2rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.6rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.5rem);line-height:1.25}
h4{font-size:1.0625rem;line-height:1.35;letter-spacing:.01em}
p{text-wrap:pretty}
::selection{background:var(--flame);color:#0B1F1A}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px;border-radius:4px}
#main-content{display:block;scroll-margin-top:110px}

/* ===== skip link ===== */
.skip-link{
  position:fixed;
  top:10px;left:12px;
  z-index:200;
  padding:10px 18px;
  border-radius:999px;
  background:var(--fog);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  transform:translateY(-160%);
  transition:transform .22s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}

/* ===== layout utilities ===== */
.container{
  width:min(1180px,100% - var(--gutter) * 2);
  margin-inline:auto;
}
.section{padding-block:clamp(40px,6vw,84px)}
.hairline{height:1px;background:var(--line);border:0;margin-block:clamp(24px,4vw,44px)}
.grid{display:grid;gap:clamp(20px,3vw,40px);grid-template-columns:1fr}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
@media (min-width:901px){
  .grid--5-7{display:grid;grid-template-columns:5fr 7fr;gap:clamp(20px,3vw,40px)}
  .grid--4-8{display:grid;grid-template-columns:4fr 8fr;gap:clamp(20px,3vw,40px)}
  .grid--3-6-3{display:grid;grid-template-columns:3fr 6fr 3fr;gap:clamp(20px,3vw,40px)}
}

/* ===== text helpers ===== */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--amber);
}
.eyebrow::before{
  content:"";
  width:18px;height:2px;
  background:linear-gradient(90deg,var(--flame),var(--amber));
  transform:skewX(-18deg);
}
.lede{
  font-size:clamp(1.0625rem,1.5vw,1.1875rem);
  line-height:1.8;
  color:var(--muted);
  max-width:44ch;
}
.prose{max-width:42em;color:rgba(243,246,242,.82)}
.prose p + p{margin-top:1em}
.prose strong{color:var(--fog);font-weight:700}

/* ===== buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.72em 1.35em;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-body);
  font-size:.875rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  white-space:nowrap;
  transition:transform .22s var(--ease),background-color .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{
  background:linear-gradient(135deg,var(--flame),#FF6A3D 62%,var(--amber));
  color:#140F0D;
  box-shadow:0 8px 22px rgba(255,77,46,.26);
}
.btn--primary:hover{box-shadow:0 12px 28px rgba(255,77,46,.36)}
.btn--ghost{
  background:rgba(243,246,242,.04);
  color:var(--fog);
  border-color:var(--line);
}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn--blue{
  background:var(--electric);
  color:#04121F;
  box-shadow:0 8px 22px rgba(46,139,255,.28);
}
.btn--blue:hover{background:#4B9DFF}

/* ===== header ===== */
.site-header{
  position:fixed;
  inset-inline:0;
  top:0;
  z-index:80;
  padding:16px var(--gutter) 0;
  pointer-events:none;
}
.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  background:rgba(243,246,242,.08);
  z-index:95;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--flame),var(--amber) 58%,var(--mint));
  transition:transform .12s linear;
}
.header-inner{
  position:relative;
  pointer-events:auto;
  width:min(1180px,100%);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
  padding:10px 12px 10px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(18,20,23,.74);
  backdrop-filter:blur(16px) saturate(130%);
  -webkit-backdrop-filter:blur(16px) saturate(130%);
  box-shadow:0 10px 30px rgba(0,0,0,.3);
  transition:padding .28s var(--ease),background-color .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.site-header[data-scrolled="true"] .header-inner{
  padding:6px 10px 6px 12px;
  background:rgba(11,31,26,.94);
  border-color:var(--line-strong);
  box-shadow:0 16px 42px rgba(0,0,0,.48);
}
.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto;border-radius:999px}
.brand-mark{
  display:grid;
  place-items:center;
  width:34px;height:34px;
  border-radius:11px;
  background:linear-gradient(140deg,var(--flame),var(--amber));
  color:#140F0D;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.04em;
  box-shadow:0 0 0 1px rgba(255,154,77,.4),0 6px 16px rgba(255,77,46,.3);
}
.brand-text{display:flex;flex-direction:column;line-height:1.12}
.brand-name{font-family:var(--font-display);font-size:1rem;font-weight:900;letter-spacing:.04em}
.brand-sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;text-transform:uppercase;color:rgba(243,246,242,.5)}
.nav-panel{margin-inline:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;
  align-items:center;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid transparent;
  font-size:.875rem;
  font-weight:500;
  color:rgba(243,246,242,.78);
  white-space:nowrap;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link:hover{color:var(--fog);background:rgba(243,246,242,.08)}
.nav-link[aria-current="page"]{
  color:#140F0D;
  font-weight:700;
  background:linear-gradient(135deg,var(--flame),#FF6A3D 70%,var(--amber));
  border-color:transparent;
  box-shadow:0 6px 16px rgba(255,77,46,.28);
}
.nav-cta{display:none}
.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.header-actions .btn{padding:.6em 1.15em;font-size:.8125rem}
.nav-toggle{
  display:none;
  width:42px;height:42px;
  flex:0 0 auto;
  place-items:center;
  gap:4px;
  border:1px solid var(--line);
  border-radius:50%;
  background:rgba(243,246,242,.05);
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--amber)}
.nav-toggle-bar{
  display:block;
  width:16px;height:2px;
  border-radius:2px;
  background:var(--fog);
  transition:transform .24s var(--ease),opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

@media (max-width:900px){
  .site-header{padding:10px var(--gutter) 0}
  .header-inner{padding:8px 10px 8px 12px;gap:8px}
  .nav-toggle{display:grid}
  .nav-panel{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    margin:0;
    padding:12px;
    border:1px solid var(--line);
    border-radius:22px;
    background:rgba(11,31,26,.97);
    backdrop-filter:blur(18px) saturate(140%);
    -webkit-backdrop-filter:blur(18px) saturate(140%);
    box-shadow:0 28px 60px rgba(0,0,0,.55);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s var(--ease);
  }
  .nav-panel[data-open="true"]{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:3px}
  .nav-link{padding:12px 14px;border-radius:14px;font-size:.9375rem}
  .nav-link[aria-current="page"]{box-shadow:none}
  .nav-cta{display:block}
  .nav-link--cta{width:100%;margin-top:4px;padding:.8em 1.1em;font-size:.9375rem}
  .header-actions .btn--ghost{display:none}
  .brand-sub{display:none}
}
@media (max-width:560px){
  .header-actions{display:none}
  .brand-name{font-size:.9375rem}
}

/* ===== panels / 展签 ===== */
.panel{
  position:relative;
  overflow:hidden;
  padding:clamp(22px,3vw,36px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(162deg,rgba(42,52,49,.6),rgba(18,20,23,.9));
  box-shadow:var(--shadow-panel);
}
.panel::before{
  content:"";
  position:absolute;
  inset:0 auto 0 0;
  width:3px;
  background:linear-gradient(180deg,var(--flame),rgba(255,154,77,.1) 72%,transparent);
}
.panel--riser{
  border-color:rgba(46,139,255,.34);
  background:linear-gradient(162deg,rgba(46,139,255,.14),rgba(18,20,23,.92));
}
.panel--riser::before{background:linear-gradient(180deg,var(--electric),rgba(39,224,200,.12) 72%,transparent)}
.panel-head{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:14px}
.panel-tag{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--muted);
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
}
.panel-title{font-size:clamp(1.2rem,1.7vw,1.6rem);line-height:1.22}
.panel-body{color:rgba(243,246,242,.8);max-width:44ch}

/* ===== data strip ===== */
.data-strip{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(148px,1fr));
  gap:clamp(14px,2vw,28px);
  padding-block:clamp(16px,2.4vw,24px);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.data-item{display:flex;flex-direction:column;gap:4px}
.data-value{
  font-family:var(--font-mono);
  font-size:clamp(1.35rem,2.4vw,1.9rem);
  font-weight:700;
  line-height:1;
  color:var(--mint);
  font-variant-numeric:tabular-nums;
}
.data-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--muted);
}

/* ===== breadcrumb ===== */
.breadcrumb{margin-block:clamp(14px,2vw,22px)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb-item{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:rgba(243,246,242,.3)}
.breadcrumb-link{color:rgba(243,246,242,.72);border-radius:4px;transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--amber)}
.breadcrumb-item[aria-current="page"]{color:var(--fog)}

/* ===== image frame ===== */
.frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:
    linear-gradient(148deg,rgba(42,52,49,.9),rgba(11,31,26,.95)),
    var(--stand);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.03);
}
.frame--wide{aspect-ratio:21 / 9}
.frame--tall{aspect-ratio:4 / 5}
.frame--cut{clip-path:polygon(0 0,100% 0,100% 88%,0 100%)}
.frame-media{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(1.06) contrast(1.05);
}
.frame-caption{
  position:absolute;
  left:12px;bottom:12px;
  padding:4px 10px;
  border-radius:999px;
  background:rgba(11,31,26,.72);
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--fog);
  backdrop-filter:blur(6px);
}

/* ===== reveal ===== */
.js .reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js .reveal[data-revealed="true"]{opacity:1;transform:none}

/* ===== footer ===== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  padding:clamp(36px,6vw,72px) 0 clamp(24px,4vw,40px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(11,31,26,.5),#0B1F1A 42%,#0A1A16);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:min(340px,42%);
  height:2px;
  background:linear-gradient(90deg,var(--flame),var(--amber) 60%,transparent);
}
.footer-top{
  display:grid;
  grid-template-columns:1.25fr 2.1fr;
  gap:clamp(24px,4vw,56px);
}
.footer-brand{display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.footer-brand-line{
  font-family:var(--font-display);
  font-size:clamp(1.35rem,2.4vw,1.75rem);
  font-weight:900;
  line-height:1.15;
  letter-spacing:.01em;
}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,36px)}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-heading{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--amber);
}
.footer-list{display:grid;gap:8px}
.footer-link{
  display:inline-block;
  font-size:.875rem;
  color:rgba(243,246,242,.72);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-link:hover{color:var(--fog);transform:translateX(3px)}
.contact-card{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:clamp(14px,2.4vw,24px);
  margin-top:clamp(26px,4vw,44px);
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:linear-gradient(140deg,rgba(42,52,49,.5),rgba(18,20,23,.55));
}
.contact-row{display:flex;flex-direction:column;gap:5px;min-width:0}
.contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:rgba(243,246,242,.5);
}
.contact-value{
  font-family:var(--font-mono);
  font-size:.8125rem;
  line-height:1.5;
  color:var(--fog);
  overflow-wrap:anywhere;
}
.footer-note{
  margin-top:clamp(16px,2.4vw,22px);
  max-width:66ch;
  font-size:.75rem;
  line-height:1.75;
  color:rgba(243,246,242,.5);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  margin-top:clamp(20px,3vw,30px);
  padding-top:clamp(16px,2.4vw,22px);
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:rgba(243,246,242,.56);
}
.footer-meta,.footer-icp,.footer-legal{margin:0}
.footer-icp{color:rgba(243,246,242,.72)}
.footer-legal{font-size:.75rem;line-height:1.7;color:rgba(243,246,242,.56)}

@media (min-width:901px){
  .footer-col:nth-child(2){margin-top:16px}
  .footer-col:nth-child(3){margin-top:32px}
}
@media (max-width:900px){
  .footer-top{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
}

/* ===== reduced motion ===== */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .btn:hover,.footer-link:hover{transform:none}
  .js .reveal{opacity:1;transform:none}
  .scroll-progress-bar{transition:none}
}