*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
[hidden]{display:none !important}

:root{
  --ink-900:#0B1A2A;
  --ink-700:#14314A;
  --indigo-500:#2E5C86;
  --amber-500:#E2A23C;
  --amber-100:#F7E7C8;
  --celadon-500:#3F8F7E;
  --celadon-100:#DFF0EA;
  --celadon-ink:#1F5A4E;
  --wine-500:#7A2340;
  --paper:#F6F4EF;
  --paper-2:#FCFBF7;
  --graphite:#2A2F36;
  --index-gray:#6E7A85;
  --line:#D8D2C6;
  --rail-w:88px;
  --rail-open:208px;
  --topbar-h:56px;
  --maxw:1280px;
  --gutter:20px;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:180ms;
  --z-topbar:60;
  --z-scrim:70;
  --z-rail:80;
  --z-toggle:90;
}
@media (min-width:768px){:root{--gutter:32px}}
@media (min-width:1024px){:root{--gutter:40px}}

body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--graphite);
  background:var(--paper);
  padding-top:var(--topbar-h);
  min-height:100vh;
}

a{color:var(--indigo-500);text-decoration:none;transition:color var(--dur) var(--ease)}
a:hover{color:var(--celadon-500)}
:focus-visible{outline:3px solid var(--celadon-500);outline-offset:3px}

#main-content{display:block;scroll-margin-top:calc(var(--topbar-h) + 12px)}
.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}
.skip-link{position:fixed;top:-120px;left:12px;z-index:200;background:var(--amber-500);color:var(--ink-900);font-size:14px;font-weight:700;letter-spacing:.06em;padding:.7rem 1.1rem;transition:top var(--dur) var(--ease);clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%)}
.skip-link:focus{top:12px;color:var(--ink-900)}

/* ---------- typography ---------- */
h1,h2,h3,h4{color:var(--ink-900);font-weight:700;line-height:1.18;letter-spacing:-.01em}
.display{font-weight:300;font-size:clamp(2.5rem,6vw,5.5rem);line-height:1.02;letter-spacing:-.02em;color:var(--ink-900)}
.display--paper{color:var(--paper)}
.h2{font-size:clamp(1.5rem,2.6vw,2.25rem);line-height:1.2}
.h3{font-size:clamp(1.1rem,1.6vw,1.35rem)}
.lede{font-family:var(--font-serif);font-size:clamp(1.05rem,1.5vw,1.3rem);line-height:1.6;color:var(--ink-700);max-width:30em}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--index-gray)}
.prose{max-width:60em}
.prose p{max-width:34em}
.prose p + p{margin-top:.9em}

/* ---------- layout ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(2.5rem,6vw,5rem)}
.section--tight{padding-block:clamp(1.5rem,3vw,2.5rem)}
.section--dark{background:var(--ink-900);color:rgba(246,244,239,.8)}
.section--dark h1,.section--dark h2,.section--dark h3{color:var(--paper)}
.grid{display:grid;gap:clamp(1rem,2vw,1.5rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.rule{border:0;border-top:1px solid var(--line);margin:0}
.rule--ticks{height:10px;border:0;border-bottom:1px solid var(--line);background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 24px)}

/* ---------- buttons & tags ---------- */
.btn{display:inline-flex;align-items:center;gap:.55em;padding:.8rem 1.25rem;font-size:14px;font-weight:700;letter-spacing:.06em;line-height:1.2;text-decoration:none;color:var(--paper);background:var(--ink-900);border:1px solid var(--ink-900);cursor:pointer;clip-path:polygon(0 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%);transition:background var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn--amber{background:var(--amber-500);border-color:var(--amber-500);color:var(--ink-900)}
.btn--amber:hover{background:var(--amber-100);border-color:var(--amber-100);color:var(--ink-900)}
.btn--celadon{background:var(--celadon-500);border-color:var(--celadon-500);color:#fff}
.btn--celadon:hover{background:var(--celadon-ink);border-color:var(--celadon-ink);color:#fff}
.btn--ghost{background:transparent;color:var(--ink-900);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--ink-900);color:var(--ink-900)}
.btn--sm{padding:.5rem .85rem;font-size:13px}
.index-tag{display:inline-flex;align-items:center;gap:.4em;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;line-height:1.5;padding:.15rem .5rem;color:var(--ink-700);background:var(--amber-100);border:1px solid rgba(226,162,60,.55)}
button.index-tag{cursor:pointer}
.index-tag[data-copied]{background:var(--celadon-100);border-color:var(--celadon-500);color:var(--celadon-ink)}
.index-tag--celadon{background:var(--celadon-100);color:var(--celadon-ink);border-color:rgba(63,143,126,.45)}
.index-tag--wine{background:rgba(122,35,64,.1);color:var(--wine-500);border-color:rgba(122,35,64,.4)}
.chip{display:inline-flex;align-items:center;gap:.4em;font-size:13px;font-weight:700;letter-spacing:.06em;padding:.4rem .8rem;color:var(--indigo-500);background:var(--paper-2);border:1px solid var(--line);cursor:pointer;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.chip:hover{border-color:var(--indigo-500)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--ink-900);border-color:var(--ink-900);color:var(--paper)}

/* ---------- panels ---------- */
.panel{background:var(--paper-2);border:1px solid var(--line);padding:clamp(1.1rem,2.4vw,1.75rem);clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%)}
.panel--dark{background:var(--ink-700);border-color:rgba(246,244,239,.16);color:rgba(246,244,239,.86)}
.panel--dark h2,.panel--dark h3{color:var(--paper)}

/* ---------- breadcrumb ---------- */
.breadcrumb{padding-block:1.1rem}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--index-gray)}
.breadcrumb li{display:inline-flex;align-items:center;gap:.5em}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--indigo-500)}
.breadcrumb a:hover{color:var(--celadon-500)}
.breadcrumb [aria-current="page"]{color:var(--graphite)}

/* ---------- media ---------- */
.media{position:relative;overflow:hidden;border:1px solid var(--line);background:var(--ink-700)}
.media img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media__tag{position:absolute;top:0;left:0;z-index:2;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.6;padding:.1rem .5rem;background:var(--amber-500);color:var(--ink-900)}
.media__placeholder{display:grid;place-items:center;width:100%;height:100%;min-height:130px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:rgba(246,244,239,.55);background-image:repeating-linear-gradient(135deg,rgba(246,244,239,.07) 0 2px,transparent 2px 12px)}
.media__caption{margin-top:.5rem;font-size:13px;line-height:1.6;color:var(--index-gray)}

/* ================= TOPBAR ================= */
.topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-h);z-index:var(--z-topbar);display:flex;align-items:center;background:rgba(246,244,239,.97);border-bottom:1px solid var(--line)}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;gap:.6rem;width:100%;max-width:var(--maxw);margin-inline:auto;padding-left:var(--gutter);padding-right:92px}
.topbar__progress{position:absolute;left:0;bottom:-1px;width:100%;height:2px;background:var(--amber-500);transform:scaleX(0);transform-origin:0 50%;will-change:transform}
.topbar__shortcut{display:inline-flex;align-items:center;gap:.35rem;flex:0 0 auto;font-size:12.5px;font-weight:700;letter-spacing:.06em;padding:.35rem .65rem;color:var(--celadon-ink);background:var(--celadon-100);border:1px solid rgba(63,143,126,.45);clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);transition:background var(--dur) var(--ease),color var(--dur) var(--ease)}
.topbar__shortcut:hover{background:var(--celadon-500);border-color:var(--celadon-500);color:#fff}
.topbar__arrow{font-family:var(--font-mono);font-size:12px}

/* search */
.search{position:relative;display:flex;align-items:center;gap:.55rem;flex:1 1 auto;min-width:0;max-width:420px;height:38px;padding:0 .75rem;background:var(--paper-2);border:1px solid var(--line);transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.search:focus-within{border-color:var(--celadon-500);background:var(--celadon-100);box-shadow:0 0 0 3px rgba(63,143,126,.16)}
.search__glyph{position:relative;flex:0 0 auto;width:11px;height:11px;border:2px solid var(--celadon-500);border-radius:50%}
.search__glyph::after{content:"";position:absolute;right:-5px;bottom:-4px;width:6px;height:2px;background:var(--celadon-500);transform:rotate(45deg)}
.search__input{flex:1 1 auto;min-width:0;height:100%;border:0;background:transparent;font-size:14px;color:var(--graphite);outline:none}
.search__input::placeholder{color:var(--index-gray)}
.search__panel{position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:12;max-height:min(64vh,340px);overflow:auto;background:var(--paper-2);border:1px solid var(--line);box-shadow:0 16px 34px rgba(11,26,42,.14)}
.search__item{display:block}
.search__item + .search__item{border-top:1px solid var(--line)}
.search__panel a{display:flex;align-items:baseline;gap:.6rem;padding:.55rem .8rem;font-size:14px;color:var(--ink-900)}
.search__panel a:hover,.search__panel a:focus-visible{background:var(--celadon-100);color:var(--ink-900)}
.search__idx{flex:0 0 auto;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--celadon-ink)}
.search__empty{padding:.8rem;font-size:13px;line-height:1.7;color:var(--index-gray)}
.search__empty a{display:inline;padding:0;color:var(--celadon-ink);text-decoration:underline;text-underline-offset:3px}
.search__empty a:hover{background:transparent}

/* ================= NAV TOGGLE ================= */
.nav-toggle{position:fixed;top:9px;right:12px;z-index:var(--z-toggle);display:inline-flex;align-items:center;gap:.45rem;height:38px;padding:0 .7rem;font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--paper);background:var(--ink-900);border:1px solid var(--ink-900);clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);transition:background var(--dur) var(--ease),color var(--dur) var(--ease)}
.nav-toggle[aria-expanded="true"]{background:var(--amber-500);border-color:var(--amber-500);color:var(--ink-900)}
.nav-toggle__bars{position:relative;display:inline-block;width:16px;height:2px;background:currentColor;transition:background var(--dur) var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;transition:transform var(--dur) var(--ease)}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{line-height:1}

/* ================= RAIL ================= */
.rail{position:fixed;top:0;left:0;bottom:0;z-index:var(--z-rail);display:flex;flex-direction:column;width:min(84vw,300px);padding:16px 0 18px;background:var(--ink-900);color:rgba(246,244,239,.78);border-right:1px solid rgba(246,244,239,.08);overflow-y:auto;overscroll-behavior:contain;transform:translateX(-102%);transition:transform .24s var(--ease),width .2s var(--ease)}
.rail[data-open]{transform:none}
.rail__brand{display:flex;align-items:center;gap:12px;padding:0 16px 18px;color:var(--paper)}
.rail__brand:hover{color:var(--paper)}
.rail__seal{flex:0 0 auto;display:grid;place-items:center;width:34px;height:34px;font-size:16px;font-weight:700;color:var(--ink-900);background:var(--amber-500);clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%)}
.rail__name{display:flex;flex-direction:column;gap:2px;min-width:0;overflow:hidden;white-space:nowrap;transition:opacity var(--dur) var(--ease)}
.rail__mark{font-size:14px;font-weight:700;letter-spacing:.14em;line-height:1.3;color:var(--paper)}
.rail__ver{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--amber-500)}
.rail__caption{margin:0 0 6px;padding:0 20px;font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:rgba(246,244,239,.42);white-space:nowrap;overflow:hidden;transition:opacity var(--dur) var(--ease)}
.rail__list{margin:0 0 10px;padding:0;list-style:none}
.rail__item{display:block}
.rail__link{position:relative;display:flex;align-items:center;gap:10px;min-height:42px;padding:0 20px;color:rgba(246,244,239,.78);font-size:14px;letter-spacing:.06em;transition:background var(--dur) var(--ease),color var(--dur) var(--ease)}
.rail__link::before{content:"";position:absolute;left:0;top:9px;bottom:9px;width:3px;background:transparent;transition:background var(--dur) var(--ease)}
.rail__link:hover{background:rgba(246,244,239,.07);color:var(--paper)}
.rail__idx{flex:0 0 auto;min-width:18px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--amber-500)}
.rail__label{white-space:nowrap;overflow:hidden}
.rail__link.is-active{color:var(--paper)}
.rail__link.is-active::before{background:rgba(226,162,60,.55)}
.rail__link[aria-current="page"]{color:var(--paper);background:rgba(226,162,60,.12)}
.rail__link[aria-current="page"]::before{background:var(--amber-500)}
.rail__link[aria-current="page"] .rail__idx{color:var(--amber-100)}
.rail__group{margin-top:6px;padding:14px 20px 0;border-top:1px solid rgba(246,244,239,.12)}
.rail__group .rail__caption{padding:0 0 6px}
.rail__sub{display:block;padding:5px 0;font-size:13px;color:rgba(246,244,239,.7)}
.rail__sub:hover{color:var(--celadon-100)}
.rail__cta{display:block;margin:auto 14px 0;padding:.8rem .5rem;font-size:12px;font-weight:700;letter-spacing:.04em;line-height:1.4;text-align:center;color:var(--ink-900);background:var(--amber-500);clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);transition:background var(--dur) var(--ease)}
.rail__cta:hover{background:var(--amber-100);color:var(--ink-900)}
.rail :focus-visible{outline-color:var(--amber-500)}
.rail-scrim{position:fixed;inset:0;z-index:var(--z-scrim);display:none;background:rgba(11,26,42,.58)}
.rail[data-open] ~ .rail-scrim{display:block}
@media (max-width:1023px){html.nav-open{overflow:hidden}}

/* ================= FOOTER ================= */
.site-footer{margin-top:clamp(3rem,7vw,6rem);background:var(--ink-900);color:rgba(246,244,239,.74);border-top:3px solid var(--amber-500)}
.site-footer a{color:rgba(246,244,239,.82)}
.site-footer a:hover{color:var(--amber-500)}
.site-footer :focus-visible{outline-color:var(--amber-500)}
.footer__inner{display:grid;grid-template-columns:1fr;gap:clamp(2rem,4vw,3rem);width:100%;max-width:var(--maxw);margin-inline:auto;padding:clamp(2.2rem,5vw,3.5rem) var(--gutter) 0}
.footer__brand{min-width:0}
.footer__mark{margin:0;font-size:clamp(1.15rem,2vw,1.4rem);font-weight:700;letter-spacing:.18em;color:var(--paper)}
.footer__ver{display:block;margin-top:.4rem;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--amber-500)}
.footer__lede{max-width:24em;margin-top:1rem;font-family:var(--font-serif);font-size:15px;line-height:1.75;color:rgba(246,244,239,.66)}
.footer__cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:1.5rem 1.25rem}
.footer__col{min-width:0}
.footer__coltitle{margin:0 0 .75rem;font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.18em;text-transform:uppercase;color:rgba(246,244,239,.45)}
.footer__list{display:grid;gap:.45rem;margin:0;padding:0;list-style:none}
.footer__item{display:block}
.footer__link{display:inline-flex;align-items:baseline;gap:.5rem;font-size:14px;line-height:1.6;color:rgba(246,244,239,.82)}
.footer__idx{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:rgba(226,162,60,.75)}
.footer__contact{min-width:0;font-style:normal}
.footer__contact-item{display:block;width:100%;text-align:left;font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;line-height:1.9;color:rgba(246,244,239,.86);text-decoration:none;transition:color var(--dur) var(--ease)}
button.footer__contact-item{border-bottom:1px dashed rgba(63,143,126,.55);cursor:pointer}
button.footer__contact-item:hover{color:var(--celadon-100);border-bottom-color:var(--celadon-100)}
.footer__contact-item--plain{font-family:var(--font-sans);font-size:14px;color:rgba(246,244,239,.7);letter-spacing:0}
.footer__note{margin-top:.9rem;padding-left:.7rem;border-left:2px solid rgba(226,162,60,.55);font-size:12.5px;line-height:1.75;color:rgba(246,244,239,.55)}
.footer__base{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;width:100%;max-width:var(--maxw);margin:clamp(1.8rem,4vw,2.6rem) auto 0;padding:1rem var(--gutter) 1.25rem;border-top:1px solid rgba(246,244,239,.14);font-size:12px;letter-spacing:.06em;color:rgba(246,244,239,.5)}
.footer__legal{font-family:var(--font-mono)}
.footer__copy{letter-spacing:.08em}
.footer__year{font-family:var(--font-mono)}

/* ================= RESPONSIVE ================= */
@media (min-width:768px){
  .footer__inner{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .topbar{left:var(--rail-w)}
  .topbar__inner{padding-right:var(--gutter)}
  .nav-toggle{display:none}
  .rail-scrim{display:none !important}
  .rail{width:var(--rail-w);transform:none;padding-top:18px}
  .rail:hover,.rail:focus-within{width:var(--rail-open);box-shadow:16px 0 36px rgba(11,26,42,.2)}
  .rail__name{width:0;opacity:0}
  .rail:hover .rail__name,.rail:focus-within .rail__name{width:auto;opacity:1}
  .rail__caption{opacity:0}
  .rail:hover .rail__caption,.rail:focus-within .rail__caption{opacity:1}
  .footer__inner{grid-template-columns:1.05fr 1.45fr 1fr}
  .footer__brand{grid-column:auto}
}
@media (min-width:1280px){
  .search{max-width:440px}
}

/* ================= 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{transform:none}
}