*,*::before,*::after{box-sizing:border-box}
body,h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit}
a{color:inherit}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

:root{
  --ink:#071A16;
  --board:#0E2B24;
  --cyan:#19E3C2;
  --amber:#E9A23B;
  --paper:#F3EEDF;
  --paper-2:#E3DCC8;
  --text-ink:#10231E;
  --mute:#8FA79E;
  --line:#315048;
  --alert:#D96B4B;
  --maxw:1280px;
  --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"SFMono-Regular",ui-monospace,"Cascadia Mono","Roboto Mono",Consolas,monospace;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.02em;
}
h1{font-size:clamp(40px,6vw,72px);letter-spacing:-.03em}
h2{font-size:clamp(28px,3.6vw,40px)}
h3{font-size:clamp(20px,2.2vw,28px)}

p{max-width:68ch}
strong{font-weight:800}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:400;
  padding:11px 18px;border-radius:10px;
  background:var(--cyan);color:#04120F;
  font-size:14px;font-weight:800;text-decoration:none;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:150;
  padding:12px var(--gutter) 11px;
  background:var(--ink);
  box-shadow:0 1px 0 rgba(49,80,72,.6);
}

.read-progress{
  position:fixed;top:0;left:0;right:0;height:3px;
  background:rgba(25,227,194,.14);
  z-index:400;pointer-events:none;
}
.read-progress span{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
}

.header-rail{
  position:relative;
  max-width:var(--maxw);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:10px;
}

.brand{
  display:inline-flex;align-items:center;gap:11px;
  flex:0 0 auto;
  padding:8px 20px 8px 9px;
  background:var(--board);
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--paper);
  text-decoration:none;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.brand:hover{border-color:var(--cyan);background:#103128}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;
  background:linear-gradient(145deg,var(--cyan) 0%,#0FA992 100%);
  color:#04120F;
  font-family:var(--font-mono);
  font-size:14px;font-weight:700;letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;line-height:1.22}
.brand-name{font-size:15px;font-weight:800;letter-spacing:-.01em}
.brand-line{font-size:10.5px;font-weight:500;letter-spacing:.06em;color:var(--mute)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  margin-left:auto;
  padding:11px 16px;
  background:var(--board);
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--paper);
  font-size:13px;font-weight:700;
  cursor:pointer;
}
.nav-toggle-icon{position:relative;display:block;width:18px;height:2px;background:var(--cyan);border-radius:2px;transition:background .2s var(--ease)}
.nav-toggle-icon::before,.nav-toggle-icon::after{
  content:"";position:absolute;left:0;width:18px;height:2px;
  background:var(--cyan);border-radius:2px;
  transition:transform .2s var(--ease);
}
.nav-toggle-icon::before{top:-6px}
.nav-toggle-icon::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{transform:translateY(-6px) rotate(-45deg)}

.primary-nav{
  display:flex;align-items:center;gap:4px;
  margin-left:auto;
  padding:5px 6px 5px 8px;
  background:rgba(14,43,36,.96);
  border:1px solid var(--line);
  border-radius:999px;
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list a{
  display:block;
  padding:8px 12px;
  border-radius:999px;
  color:var(--paper);
  font-size:14px;font-weight:600;letter-spacing:.01em;
  text-decoration:none;white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.nav-list a:hover{background:rgba(25,227,194,.14);color:var(--cyan)}
.nav-list a[aria-current="page"]{background:var(--cyan);color:#04120F}
.nav-list a[aria-current="page"]:hover{background:var(--cyan);color:#04120F}

.nav-tools{
  display:flex;align-items:center;gap:2px;
  margin-left:6px;padding-left:6px;
  border-left:1px solid var(--line);
}
.tool-btn{
  padding:8px 9px;
  background:none;border:0;border-radius:999px;
  color:var(--mute);
  font-size:13px;font-weight:600;white-space:nowrap;
  cursor:pointer;
  transition:color .18s var(--ease),background .18s var(--ease);
}
.tool-btn:hover{color:var(--cyan);background:rgba(25,227,194,.1)}
.tool-btn[aria-expanded="true"]{color:var(--cyan);background:rgba(25,227,194,.16)}

.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  margin-left:8px;
  padding:9px 17px;
  background:var(--amber);
  color:#1B1104;
  font-size:14px;font-weight:800;letter-spacing:.01em;
  text-decoration:none;white-space:nowrap;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.nav-cta:hover{background:#F6B959}

.tool-panels{
  position:absolute;
  top:calc(100% + 10px);right:0;
  width:min(360px,calc(100vw - 2 * var(--gutter)));
  z-index:200;
}
.tool-panel{
  background:var(--board);
  border:1px solid var(--line);
  border-radius:16px;
  padding:16px 18px 18px;
  box-shadow:0 20px 44px rgba(0,0,0,.55);
}
.tool-panel[hidden]{display:none}
.tool-panel-title{
  font-size:12px;font-weight:800;letter-spacing:.14em;
  color:var(--cyan);text-transform:uppercase;
  margin-bottom:12px;
}
.chip-list{display:flex;flex-wrap:wrap;gap:7px}
.chip{
  padding:6px 13px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--paper);
  font-size:13px;font-weight:600;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.chip:hover{border-color:var(--cyan);color:var(--cyan)}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04120F}
.tool-panel-note{
  margin-top:12px;
  font-size:12.5px;line-height:1.7;
  color:var(--mute);
  letter-spacing:.02em;
}
.panel-link{
  display:inline-block;margin-top:12px;
  color:var(--cyan);font-size:14px;font-weight:700;
  text-decoration:none;
  border-bottom:1px solid rgba(25,227,194,.45);
  padding-bottom:2px;
}
.panel-link:hover{border-color:var(--cyan)}
.field-label{display:block;margin-bottom:6px;font-size:12.5px;color:var(--mute);letter-spacing:.04em}
.field-input{
  width:100%;
  padding:10px 12px;
  background:rgba(7,26,22,.85);
  border:1px solid var(--line);
  border-radius:10px;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:15px;
}
.field-input::placeholder{color:#6E857D}
.field-input:focus{border-color:var(--cyan);outline:none;box-shadow:0 0 0 2px rgba(25,227,194,.22)}
.search-results{margin-top:10px;max-height:220px;overflow-y:auto}
.search-results a{
  display:block;
  padding:7px 10px;
  border-radius:9px;
  color:var(--paper);
  font-size:14px;text-decoration:none;
}
.search-results a:hover{background:var(--cyan);color:#04120F}
.search-empty{padding:7px 10px;font-size:13px;color:var(--mute)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  padding:clamp(42px,6vw,76px) var(--gutter) 26px;
  background:var(--ink);
  border-top:1px solid var(--line);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(transparent 95%,rgba(49,80,72,.4) 95%),
    linear-gradient(90deg,transparent 95%,rgba(49,80,72,.4) 95%);
  background-size:52px 52px;
  -webkit-mask-image:radial-gradient(120% 80% at 85% 0%,#000 0%,transparent 72%);
  mask-image:radial-gradient(120% 80% at 85% 0%,#000 0%,transparent 72%);
}
.footer-shell{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto}
.footer-head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:14px 28px;
  padding-bottom:clamp(18px,3vw,28px);
  border-bottom:1px solid var(--line);
}
.footer-wordmark{
  font-family:var(--font-display);
  font-size:clamp(30px,6.4vw,68px);
  font-weight:800;
  letter-spacing:-.035em;
  line-height:1;
  color:var(--paper);
  max-width:none;
}
.footer-tagline{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;
  color:var(--mute);
  max-width:none;
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr 1fr 1.35fr;
  gap:clamp(24px,4vw,52px);
  margin-top:clamp(28px,4vw,44px);
}
.footer-title{
  font-size:11.5px;font-weight:800;letter-spacing:.16em;
  color:var(--cyan);text-transform:uppercase;
  margin-bottom:14px;
}
.footer-links{display:grid;gap:9px}
.footer-links a{
  color:rgba(243,238,223,.82);
  font-size:15px;text-decoration:none;
  transition:color .18s var(--ease);
}
.footer-links a:hover{color:var(--cyan)}
.footer-contact .footer-line{
  font-size:15px;line-height:1.7;
  color:rgba(243,238,223,.85);
  margin-bottom:8px;
  max-width:none;
}
.footer-key{
  display:inline-block;min-width:46px;
  font-size:11.5px;letter-spacing:.1em;
  color:var(--mute);
}
.copy-btn{
  margin:2px 0 14px;
  padding:6px 15px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--cyan);
  font-size:13px;font-weight:700;
  cursor:pointer;
  transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);background:rgba(25,227,194,.12)}
.copy-btn[data-copied="true"]{background:var(--cyan);border-color:var(--cyan);color:#04120F}
.footer-note{
  margin-top:clamp(26px,4vw,40px);
  padding-top:20px;
  border-top:1px solid var(--line);
  font-size:13px;line-height:1.85;
  color:var(--mute);
  letter-spacing:.02em;
  max-width:64ch;
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  margin-top:18px;
  font-size:12.5px;
  color:var(--mute);
  letter-spacing:.04em;
}
.footer-copy,.footer-icp{max-width:none}

/* ---------- shared content utilities ---------- */
.page-wrap{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.rule{
  height:1px;border:0;margin:0;
  background:linear-gradient(90deg,var(--line),transparent);
}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;font-weight:700;letter-spacing:.18em;
  color:var(--cyan);text-transform:uppercase;
  max-width:none;
}
.kicker::before{content:"";width:22px;height:2px;background:var(--amber)}
.tag{
  display:inline-block;
  padding:3px 10px;
  background:rgba(233,162,59,.16);
  border:1px solid rgba(233,162,59,.5);
  border-radius:4px;
  color:var(--amber);
  font-family:var(--font-mono);
  font-size:11.5px;font-weight:700;letter-spacing:.08em;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;font-weight:800;letter-spacing:.01em;
  text-decoration:none;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn--primary{
  background:var(--cyan);color:#04120F;
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  border-radius:0;
}
.btn--primary:hover{background:#3CF0D3}
.btn--ghost{
  background:transparent;border-color:var(--line);color:var(--paper);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.breadcrumb{padding:clamp(18px,3vw,28px) 0 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb-item{
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.08em;
  color:var(--mute);
  max-width:none;
}
.breadcrumb-item + .breadcrumb-item::before{content:"/";margin-right:8px;color:var(--line)}
.breadcrumb-link{color:var(--mute);text-decoration:none}
.breadcrumb-link:hover{color:var(--cyan)}
.image-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--board);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
  aspect-ratio:3/2;
}
.image-frame img{width:100%;height:100%;object-fit:cover}
.image-frame--wide{aspect-ratio:16/9}
.image-frame--tall{aspect-ratio:3/4}
.image-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(7,26,22,0) 45%,rgba(7,26,22,.62) 100%);
}

/* ---------- responsive ---------- */
@media (max-width:1140px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;
    top:calc(100% + 10px);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    margin-left:0;
    padding:12px;
    border-radius:20px;
    display:none;
    box-shadow:0 22px 48px rgba(0,0,0,.55);
  }
  .primary-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-list a{padding:12px 14px;font-size:15px;border-radius:12px}
  .nav-tools{
    flex-direction:column;align-items:stretch;gap:2px;
    margin:8px 0 0;padding:8px 0 0;
    border-left:0;border-top:1px solid var(--line);
  }
  .tool-btn{text-align:left;padding:11px 14px;font-size:14px;border-radius:12px}
  .nav-cta{margin:10px 0 0;padding:12px 18px;font-size:15px;border-radius:10px;clip-path:none}
  .tool-panels{width:100%}
}

@media (max-width:860px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:620px){
  body{font-size:16px}
  .brand-line{display:none}
  .brand{padding:7px 15px 7px 8px;gap:9px}
  .brand-mark{width:34px;height:34px;font-size:13px}
  .brand-name{font-size:14px}
  .grid-12{grid-template-columns:1fr;gap:16px}
  .footer-grid{grid-template-columns:1fr}
  .footer-head{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-base{justify-content:flex-start}
  .btn{width:100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .brand:hover,.chip:hover,.btn:hover{transform:none}
}