/* ========== reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg,picture,video{max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:900;line-height:1.14;letter-spacing:-.02em}

/* ========== tokens ========== */
:root{
  --ink:#0B1F33;
  --ink-panel:#122B45;
  --paper:#F2EFE8;
  --white:#FBFAF6;
  --orange:#FF6A2B;
  --orange-mist:#FFE3D6;
  --celadon:#2E8B78;
  --celadon-mist:#DDF1EA;
  --index-gray:#6B7785;
  --line:#D8D3C8;
  --rust:#9A4B00;
  --rail-w:264px;
  --bar-h:64px;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-pill:999px;
  --measure:66ch;
  --mono:"IBM Plex Mono","JetBrains Mono",SFMono-Regular,Consolas,monospace;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}

/* ========== base typography ========== */
body{
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--orange-mist);color:var(--ink)}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px}
a:focus:not(:focus-visible),button:focus:not(:focus-visible){outline:none}

.mono,time{font-family:var(--mono);letter-spacing:.08em}
.muted{color:var(--index-gray)}
.hairline{border:0;border-top:1px solid var(--line);margin:0}

/* ========== buttons ========== */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  padding:.85rem 1.5rem;min-height:48px;
  border:1px solid transparent;border-radius:var(--radius-pill);
  font-family:var(--sans);font-size:.95rem;font-weight:700;
  cursor:pointer;transition:transform .18s ease-out,background .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.btn--primary{background:var(--orange);color:var(--ink)}
.btn--primary:hover{background:#FF8149;transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn--ghost:hover{background:var(--ink);color:var(--paper)}
.btn--quiet{background:var(--celadon-mist);color:#1F6153}
.btn--quiet:hover{background:#CDE9DF;transform:translateY(-2px)}
.btn--small{padding:.55rem 1.05rem;min-height:40px;font-size:.82rem}

/* ========== chips / tags / status ========== */
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.45rem 1rem;min-height:40px;
  border:1px solid var(--line);border-radius:var(--radius-pill);
  background:var(--white);color:var(--ink);
  font-size:.85rem;font-weight:600;cursor:pointer;
  transition:background .18s ease-out,border-color .18s ease-out,color .18s ease-out;
}
.chip:hover{border-color:var(--ink);background:var(--orange-mist)}
.chip[aria-pressed="true"],.chip[aria-current="page"]{background:var(--ink);border-color:var(--ink);color:var(--paper)}

.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.28rem .6rem;border-radius:8px;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;
  background:var(--orange-mist);color:var(--rust);
}
.tag--green{background:var(--celadon-mist);color:#1F6153}
.tag--mono{background:transparent;border:1px solid var(--line);color:var(--index-gray)}

.status{
  display:inline-flex;align-items:center;gap:.45em;
  padding:.3rem .65rem;border-radius:var(--radius-pill);
  background:var(--celadon-mist);color:#1F6153;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;
}
.status__dot{width:7px;height:7px;border-radius:50%;background:var(--celadon);flex:none}

/* ========== breadcrumbs ========== */
.breadcrumbs{padding-top:18px}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:.5em;font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;color:var(--index-gray)}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:.5em}
.breadcrumbs__link{color:var(--index-gray);border-bottom:1px solid transparent;transition:color .18s,border-color .18s}
.breadcrumbs__link:hover{color:var(--rust);border-bottom-color:currentColor}
.breadcrumbs__sep{opacity:.55}
.breadcrumbs__item[aria-current="page"]{color:var(--ink)}

/* ========== layout ========== */
.site-main{display:block;min-height:50vh}
.container{width:min(calc(100% - 36px),1180px);margin-inline:auto}
.container--narrow{width:min(calc(100% - 36px),760px);margin-inline:auto}
.grid{display:grid;gap:24px;grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1fr)}
.section{padding-block:clamp(48px,7vw,96px)}
.section__head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(20px,3vw,36px)}
.eyebrow{margin:0;font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--rust)}
.lede{margin:0;max-width:58ch;font-size:1.15rem;line-height:1.72;color:#22374B}
.prose{max-width:var(--measure);font-size:1rem;line-height:1.8}
.prose p{margin:0 0 1em}
.prose ul,.prose ol{margin:0 0 1em;padding-left:1.45em;list-style:revert}
.prose li{margin-bottom:.4em}
.prose a{color:var(--rust);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--ink)}

/* ========== cards & media ========== */
.card{
  background:var(--white);border:1px solid var(--line);
  border-radius:var(--radius-lg);padding:clamp(20px,3vw,32px);
}
.card--ink{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.card__title{margin:0 0 .4em;font-size:1.15rem;line-height:1.3}

.media-frame{
  position:relative;overflow:hidden;display:block;
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:var(--ink-panel);aspect-ratio:16/10;
}
.media-frame img,.media-frame svg,.media-frame picture{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-caption{margin:.7em 0 0;font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;color:var(--index-gray)}

/* ========== skip link ========== */
.skip-link{
  position:fixed;top:12px;left:12px;z-index:400;
  padding:.6rem 1.1rem;border-radius:var(--radius-pill);
  background:var(--orange);color:var(--ink);font-weight:700;font-size:.9rem;
  transform:translateY(-180%);transition:transform .2s ease-out;
}
.skip-link:focus{transform:none}

/* ========== header (mobile base) ========== */
body.is-locked{overflow:hidden}
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--ink);color:var(--paper);
}
.site-header__top{
  position:relative;z-index:4;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  min-height:var(--bar-h);padding:10px 18px;
  background:var(--ink);
}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--paper)}
.brand__mark{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;line-height:1;
  padding:.4rem .5rem;border:1px solid rgba(255,106,43,.8);border-radius:10px;color:var(--orange);
}
.brand__text{display:flex;flex-direction:column;gap:2px}
.brand__name{font-size:1.05rem;font-weight:900;letter-spacing:-.01em;line-height:1.25}
.brand__tag{font-size:.7rem;letter-spacing:.02em;color:rgba(242,239,232,.6);line-height:1.3}
.brand--footer{color:var(--ink)}
.brand--footer .brand__mark{border-color:var(--orange);color:var(--rust)}
.brand--footer .brand__tag{color:var(--index-gray)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  min-height:44px;padding:.5rem .95rem .5rem .8rem;
  background:rgba(242,239,232,.1);color:var(--paper);
  border:1px solid rgba(242,239,232,.26);border-radius:var(--radius-pill);
  font-size:.85rem;font-weight:700;cursor:pointer;
  transition:background .18s ease-out;
}
.nav-toggle:hover{background:rgba(242,239,232,.2)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .2s ease-out,opacity .2s ease-out}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

.nav-scrim{
  position:fixed;inset:0;z-index:2;
  background:rgba(6,16,26,.62);
  opacity:0;visibility:hidden;
  transition:opacity .26s ease-out,visibility .26s ease-out;
}
.site-header[data-open] .nav-scrim{opacity:1;visibility:visible}

.site-header__panel{
  position:fixed;top:0;bottom:0;left:0;z-index:3;
  display:flex;flex-direction:column;gap:26px;
  width:min(340px,86vw);
  padding:calc(var(--bar-h) + 20px) 22px 30px;
  background:var(--ink-panel);
  overflow-y:auto;
  transform:translateX(-102%);visibility:hidden;
  transition:transform .26s ease-out,visibility .26s ease-out;
}
.site-header[data-open] .site-header__panel{transform:none;visibility:visible}

.rail-nav__label,.rail-tools__label{
  margin:0 0 10px;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.22em;
  color:rgba(242,239,232,.45);
}
.rail-nav__list{display:flex;flex-direction:column;gap:2px}
.rail-nav__link{
  display:flex;align-items:baseline;gap:12px;
  padding:10px 12px;border-radius:14px;
  border-left:2px solid transparent;
  color:rgba(242,239,232,.82);
  transition:background .18s ease-out,color .18s ease-out,transform .18s ease-out,border-color .18s ease-out;
}
.rail-nav__link:hover{background:rgba(242,239,232,.08);color:var(--white);transform:translateX(3px)}
.rail-nav__link[aria-current="page"]{background:var(--ink-panel);color:var(--white);border-left-color:var(--orange)}
.rail-nav__link[aria-current="page"] .rail-nav__num{color:var(--orange)}
.rail-nav__num{min-width:1.7em;font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;color:rgba(242,239,232,.4)}
.rail-nav__text{font-size:1rem;font-weight:600;letter-spacing:.01em;line-height:1.4}

.rail-tools{display:flex;flex-direction:column;gap:10px;padding-top:18px;border-top:1px solid rgba(242,239,232,.14)}
.tool-link{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:11px 14px;border-radius:14px;
  background:rgba(242,239,232,.07);color:var(--paper);
  font-size:.92rem;font-weight:600;
  transition:background .18s ease-out,color .18s ease-out,transform .18s ease-out;
}
.tool-link::after{content:"\2197";font-family:var(--mono);font-size:.85em;opacity:.65}
.tool-link:hover{background:rgba(242,239,232,.15);transform:translateY(-2px)}
.tool-link--accent{background:var(--orange);color:var(--ink)}
.tool-link--accent:hover{background:#FF8149}
.rail-status{
  display:flex;align-items:center;gap:8px;margin:4px 0 0;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;
  color:rgba(242,239,232,.55);
}
.pulse-dot{
  width:8px;height:8px;flex:none;border-radius:50%;background:var(--celadon);
  animation:pulse 2.4s ease-out infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(46,139,120,.55)}
  70%{box-shadow:0 0 0 9px rgba(46,139,120,0)}
  100%{box-shadow:0 0 0 0 rgba(46,139,120,0)}
}

/* ========== footer ========== */
.site-footer{
  margin-top:clamp(64px,9vw,96px);
  padding:clamp(40px,6vw,60px) 0 26px;
  background:var(--paper);border-top:1px solid var(--line);
}
.site-footer__inner{
  width:min(calc(100% - 36px),1180px);margin-inline:auto;
  display:grid;gap:34px 28px;grid-template-columns:minmax(0,1fr);
}
.footer-brand__note{margin-top:14px;max-width:34ch;font-size:.88rem;line-height:1.65;color:#33465A}
.footer-batch{margin-top:10px;font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;color:var(--index-gray)}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--mono);font-size:.72rem;font-weight:500;letter-spacing:.18em;
  color:var(--index-gray);
}
.footer-list{display:flex;flex-direction:column;gap:8px;font-size:.92rem}
.footer-list--plain{gap:6px}
.footer-link{
  color:var(--ink);border-bottom:1px solid transparent;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.footer-link:hover{color:var(--rust);border-bottom-color:currentColor}
.footer-contact__line{font-size:.88rem;line-height:1.65;color:#33465A}
.footer-note{margin-top:10px;font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;color:var(--index-gray)}
.site-footer__legal{
  width:min(calc(100% - 36px),1180px);margin:32px auto 0;padding-top:18px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;color:var(--index-gray);
}

/* ========== progress & reveal ========== */
.read-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:300;
  pointer-events:none;background:transparent;
}
.read-progress__bar{
  display:block;height:100%;width:100%;
  background:var(--orange);transform:scaleX(0);transform-origin:0 50%;
}
[data-reveal][data-reveal-armed]{opacity:0;transform:translateY(16px);transition:opacity .5s ease-out,transform .5s ease-out}
[data-reveal][data-reveal-seen]{opacity:1;transform:none}

/* ========== responsive ========== */
@media (min-width:720px){
  .site-footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .container,.container--narrow,.site-footer__inner,.site-footer__legal{width:min(calc(100% - 64px),1180px)}
  .container--narrow{width:min(calc(100% - 64px),760px)}
}
@media (min-width:960px){
  body{padding-left:var(--rail-w)}
  .read-progress{left:var(--rail-w)}
  .site-header{
    position:fixed;top:0;bottom:0;left:0;z-index:60;
    width:var(--rail-w);
    display:flex;flex-direction:column;gap:26px;
    padding:26px 20px 22px;
    overflow-y:auto;
    border-right:1px solid rgba(242,239,232,.12);
  }
  .site-header__top{padding:0;min-height:0;display:block;background:transparent}
  .nav-toggle{display:none}
  .nav-scrim{display:none}
  .site-header__panel{
    position:static;transform:none;visibility:visible;
    width:auto;padding:0;background:transparent;overflow:visible;
    display:flex;flex:1;flex-direction:column;gap:26px;
  }
  body.is-locked{overflow:auto}
  .grid--split{grid-template-columns:minmax(0,1fr) 320px;gap:40px}
  .site-footer__inner{grid-template-columns:1.4fr .8fr .9fr 1.2fr}
}
@media (min-width:1080px){
  .container,.site-footer__inner,.site-footer__legal{width:min(calc(100% - 96px),1180px)}
  .container--narrow{width:min(calc(100% - 96px),760px)}
}
@media (max-width:479px){
  .brand__tag{display:none}
}

/* ========== motion accessibility ========== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal][data-reveal-armed]{opacity:1;transform:none;transition:none}
  .pulse-dot{box-shadow:none}
}