/* =========================================================
   游艇会206 · site.css  (reset → tokens → shell → components)
   ========================================================= */

*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--bar-h) + 20px)}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

/* ------------------ tokens ------------------ */
:root{
  --ink:#0A1B2E;
  --ink-2:#12314F;
  --ice:#BFD7E8;
  --paper:#F3EFE6;
  --cyan:#35E0C8;
  --orange:#FF6B35;
  --amber:#F2C14E;
  --slate:#6B7C8C;
  --ripple:#E4EDF3;

  --rail-w:0px;
  --bar-h:64px;
  --gutter:clamp(18px,4.2vw,56px);
  --radius:20px;
  --radius-lg:32px;
  --pill:999px;

  --line:rgba(10,27,46,.14);
  --line-strong:rgba(10,27,46,.30);
  --line-inv:rgba(191,215,232,.20);

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

  --t--1:.8125rem;
  --t-0:1rem;
  --t-1:clamp(1.0625rem,1.2vw,1.1875rem);
  --t-2:clamp(1.75rem,3.2vw,2.75rem);
  --t-3:clamp(2.5rem,6.4vw,5rem);
  --t-4:clamp(3.25rem,11vw,11rem);
}
@media (min-width:1024px){:root{--rail-w:272px;--bar-h:0px}}

/* ------------------ base ------------------ */
body{
  font-family:var(--font-sans);
  font-size:var(--t-0);
  font-weight:400;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(120% 80% at 100% 0%,rgba(191,215,232,.35),transparent 60%);
  padding-top:var(--bar-h);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:300;line-height:1.14;letter-spacing:-.02em}
strong,b{font-weight:600}
::selection{background:var(--cyan);color:var(--ink)}

/* ------------------ skip link ------------------ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  transform:translateY(-220%);
  display:inline-flex;align-items:center;
  padding:10px 20px;border-radius:var(--pill);
  background:var(--cyan);color:var(--ink);
  font-size:var(--t--1);font-weight:600;letter-spacing:.02em;
  box-shadow:0 12px 30px -14px rgba(10,27,46,.7);
  transition:transform .2s ease;
}
.skip-link:focus-visible{transform:translateY(0)}

/* =========================================================
   HEADER / RAIL
   ========================================================= */
.site-header{position:fixed;top:0;right:0;left:0;height:var(--bar-h);z-index:90}

.progress-bar{
  position:fixed;top:0;left:var(--rail-w);right:0;height:2px;z-index:120;
  background:rgba(53,224,200,.12);pointer-events:none;
}
.progress-bar__fill{
  display:block;height:100%;width:calc(var(--progress,0) * 100%);
  background:var(--cyan);box-shadow:0 0 12px rgba(53,224,200,.75);
}

.rail{
  position:relative;height:100%;
  display:flex;flex-direction:row;align-items:center;gap:12px;
  padding:0 var(--gutter) 0 18px;
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(0deg,transparent 0 31px,rgba(191,215,232,.055) 31px 32px),
    radial-gradient(90% 120% at 0% 0%,rgba(53,224,200,.10),transparent 62%);
  color:var(--ice);
  border-bottom:1px solid var(--line-inv);
}

/* brand */
.brand{display:flex;align-items:center;gap:11px;min-width:0;order:0}
.brand__mark{
  flex:none;display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-weight:700;font-size:1rem;letter-spacing:.04em;
  line-height:1;padding:5px 9px;border-radius:10px;
  background:var(--cyan);color:var(--ink);
}
.brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand__name{font-size:.9375rem;font-weight:500;letter-spacing:.02em;color:#fff;white-space:nowrap}
.brand__tag{font-size:.625rem;letter-spacing:.24em;color:var(--slate);white-space:nowrap}

/* mobile toggle */
.nav-toggle{
  order:3;margin-left:auto;flex:none;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:var(--pill);
  border:1px solid var(--line-inv);color:var(--ice);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;
  transition:border-color .2s ease,background .2s ease,color .2s ease;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--cyan);color:#fff;background:rgba(53,224,200,.10)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:1.5px;width:100%;border-radius:2px;background:currentColor;transition:transform .24s ease,opacity .2s ease}
.site-header[data-open] .nav-toggle{border-color:var(--cyan);background:rgba(53,224,200,.14)}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

/* rail foot (version chip) */
.rail__foot{order:2;margin-left:auto;display:flex;align-items:center;gap:10px;min-width:0}
.version-chip{
  display:inline-flex;align-items:center;gap:8px;white-space:nowrap;
  padding:6px 13px;border-radius:var(--pill);
  border:1px solid rgba(53,224,200,.5);background:rgba(53,224,200,.10);color:var(--cyan);
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;
  transition:background .2s ease,border-color .2s ease;
}
.version-chip:hover,.version-chip:focus-visible{background:rgba(53,224,200,.22);border-color:var(--cyan)}
.version-chip__dot{
  width:6px;height:6px;border-radius:50%;background:var(--cyan);flex:none;
  box-shadow:0 0 0 3px rgba(53,224,200,.18);
  animation:vh-pulse 2.8s ease-in-out infinite;
}
@keyframes vh-pulse{0%,100%{opacity:1}50%{opacity:.32}}
.rail__note{display:none}

/* nav — mobile drawer */
.site-nav{
  position:fixed;left:0;right:0;top:var(--bar-h);
  max-height:calc(100vh - var(--bar-h));
  max-height:calc(100dvh - var(--bar-h));
  overflow-y:auto;-webkit-overflow-scrolling:touch;
  z-index:88;
  padding:16px var(--gutter) 26px;
  background-color:var(--ink-2);
  background-image:repeating-linear-gradient(0deg,transparent 0 31px,rgba(191,215,232,.05) 31px 32px);
  color:var(--ice);
  border-bottom:1px solid var(--line-inv);
  border-radius:0 0 28px 28px;
  box-shadow:0 30px 60px -34px rgba(0,0,0,.85);
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
}
.site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
.site-nav__cap{
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.28em;
  color:var(--slate);padding:4px 12px 12px;
}
.site-nav__list{display:flex;flex-direction:column;gap:2px}
.site-nav__link{
  position:relative;display:flex;align-items:center;gap:14px;
  padding:12px 12px;border-radius:14px;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.site-nav__num{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;
  color:var(--slate);flex:none;width:2.4ch;text-align:right;
  transition:color .18s ease;
}
.site-nav__label{font-size:1rem;letter-spacing:.01em;color:var(--ice)}
.site-nav__link:hover,.site-nav__link:focus-visible{background:rgba(53,224,200,.09)}
.site-nav__link:hover .site-nav__label,.site-nav__link:focus-visible .site-nav__label{color:#fff}
.site-nav__link[aria-current="page"]{background:rgba(53,224,200,.14)}
.site-nav__link[aria-current="page"] .site-nav__label{color:#fff;font-weight:500}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--cyan)}
.site-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:20px;
  transform:translateY(-50%);border-radius:2px;background:var(--cyan);
}
.site-nav__foot{
  display:flex;flex-direction:column;gap:10px;align-items:flex-start;
  margin-top:18px;padding-top:16px;border-top:1px dashed var(--line-inv);
}
.site-nav__hint{font-size:var(--t--1);color:var(--ice);opacity:.72}
.site-nav__cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 20px;border-radius:var(--pill);
  background:var(--cyan);color:var(--ink);
  font-size:.875rem;font-weight:600;
  transition:background .18s ease,transform .18s ease;
}
.site-nav__cta:hover{background:#2ad3bd;transform:translateY(-2px)}

/* scrim */
.nav-scrim{
  position:fixed;left:0;right:0;top:var(--bar-h);bottom:0;z-index:86;
  background:rgba(10,27,46,.6);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .22s ease,visibility .22s;
}
.site-header[data-open] .nav-scrim{opacity:1;visibility:visible;pointer-events:auto}

/* vertical progress axis (desktop only) */
.rail__axis{display:none}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{
  position:relative;overflow:hidden;
  margin-left:var(--rail-w);
  background-color:var(--ink);
  color:var(--ice);
  border-top:1px solid var(--line-inv);
}
.site-footer::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(191,215,232,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(191,215,232,.055) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:radial-gradient(120% 90% at 80% 0%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(120% 90% at 80% 0%,#000 20%,transparent 78%);
}
.site-footer::after{
  content:"206";position:absolute;right:-.05em;bottom:-.30em;z-index:0;pointer-events:none;
  font-family:var(--font-mono);font-weight:700;line-height:1;letter-spacing:-.04em;
  font-size:clamp(110px,20vw,240px);color:rgba(191,215,232,.055);
}
.footer__inner{position:relative;z-index:1;padding-block:clamp(40px,6vw,76px) 0}
.footer__grid{display:grid;grid-template-columns:1fr;gap:clamp(26px,4vw,48px)}
.footer__col{min-width:0}
.footer__col--brand{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer__brand{
  font-size:clamp(1.35rem,2.4vw,1.75rem);font-weight:300;letter-spacing:.01em;color:#fff;
}
.footer__brand:hover{color:var(--cyan)}
.footer__tag{
  font-size:.6875rem;letter-spacing:.28em;color:var(--slate);
  padding-left:2px;
}
.footer__icp{
  margin-top:6px;font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.06em;
  color:var(--slate);padding:5px 11px;border-radius:var(--pill);border:1px solid var(--line-inv);
}
.footer__title{
  font-size:.75rem;font-weight:500;letter-spacing:.22em;color:var(--ice);
  font-family:var(--font-mono);margin-bottom:14px;text-transform:uppercase;
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__list a{font-size:.9375rem;color:var(--ice);opacity:.82;transition:color .18s ease,opacity .18s ease,transform .18s ease}
.footer__list a:hover,.footer__list a:focus-visible{color:var(--cyan);opacity:1;transform:translateX(3px)}
.footer__list--meta{gap:11px}
.footer__list--meta li{
  display:flex;align-items:baseline;justify-content:space-between;gap:14px;
  font-size:.8125rem;color:var(--slate);
  padding-bottom:9px;border-bottom:1px dashed rgba(191,215,232,.13);
}
.footer__mono{font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.04em;color:var(--ice);text-align:right}
.footer__list--contact li{flex-wrap:wrap;justify-content:flex-start;gap:6px 12px}
.footer__list--contact .footer__mono{overflow-wrap:anywhere;word-break:break-word;text-align:left}
.footer__link{
  display:inline-flex;align-items:center;gap:8px;margin-top:14px;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;color:var(--cyan);
  border-bottom:1px solid rgba(53,224,200,.35);padding-bottom:3px;
}
.footer__link:hover{border-bottom-color:var(--cyan)}
.footer__note{
  margin-top:14px;font-size:.75rem;line-height:1.7;color:var(--slate);max-width:32ch;
}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  margin-top:clamp(30px,4.5vw,52px);padding-block:20px 26px;
  border-top:1px solid var(--line-inv);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;color:var(--slate);
}
.footer__path{color:var(--ice);opacity:.6}
.footer__copy{font-variant-numeric:tabular-nums}

/* =========================================================
   PAGE-BASE COMPONENTS
   ========================================================= */
#main-content{display:block;margin-left:var(--rail-w)}

.container{
  width:100%;max-width:1240px;margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-block:clamp(52px,8vw,120px)}
.section--tight{padding-block:clamp(32px,5vw,64px)}
.section__title{font-size:var(--t-2);font-weight:300;letter-spacing:-.02em;line-height:1.14}
.lead{font-size:var(--t-1);line-height:1.8;color:var(--ink-2);max-width:62ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.28em;
  color:var(--slate);text-transform:uppercase;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.6;flex:none}
.num{font-family:var(--font-mono);letter-spacing:.04em;font-variant-numeric:tabular-nums}
.rule{height:1px;border:0;background:var(--line);width:100%}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;border-radius:var(--pill);
  font-size:.9375rem;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;
  transition:transform .18s ease,background .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--cyan);color:var(--ink);box-shadow:0 16px 32px -20px rgba(53,224,200,.95)}
.btn--primary:hover{background:#2ad3bd}
.btn--ghost{border-color:var(--line-strong);color:var(--ink);background:transparent}
.btn--ghost:hover{border-color:var(--ink);background:rgba(10,27,46,.06)}
.btn--onDark{border-color:var(--line-inv);color:var(--ice)}
.btn--onDark:hover{border-color:var(--cyan);color:#fff;background:rgba(53,224,200,.10)}

/* chips */
.chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 12px;border-radius:var(--pill);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;
  border:1px solid transparent;white-space:nowrap;
}
.chip--live{color:#0c3d36;background:rgba(53,224,200,.30);border-color:rgba(53,224,200,.85)}
.chip--pending{color:#7a2c0f;background:rgba(255,107,53,.24);border-color:rgba(255,107,53,.8)}
.chip--archive{color:#6a4a08;background:rgba(242,193,78,.28);border-color:rgba(242,193,78,.8)}

/* dark surface */
.surface-dark{
  background-color:var(--ink);color:var(--ice);
  background-image:repeating-linear-gradient(0deg,transparent 0 31px,rgba(191,215,232,.05) 31px 32px);
}
.surface-dark .section__title{color:#fff}
.surface-dark .lead{color:var(--ice);opacity:.86}
.surface-dark .eyebrow{color:var(--cyan)}
.surface-dark .rule{background:var(--line-inv)}
.surface-dark .chip--live{color:var(--cyan);background:rgba(53,224,200,.12);border-color:rgba(53,224,200,.5)}
.surface-dark .chip--pending{color:var(--orange);background:rgba(255,107,53,.12);border-color:rgba(255,107,53,.5)}
.surface-dark .chip--archive{color:var(--amber);background:rgba(242,193,78,.12);border-color:rgba(242,193,78,.5)}

/* breadcrumbs */
.breadcrumbs{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;color:var(--slate)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";opacity:.45}
.breadcrumbs a{transition:color .18s ease}
.breadcrumbs a:hover,.breadcrumbs a:focus-visible{color:var(--ink)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}
.surface-dark .breadcrumbs,.surface-dark .breadcrumbs [aria-current="page"]{color:var(--ice)}
.surface-dark .breadcrumbs a:hover{color:var(--cyan)}

/* image frame — abstract sea-at-night placeholder */
.img-frame{
  position:relative;isolation:isolate;overflow:hidden;
  border-radius:var(--radius-lg);
  aspect-ratio:16/10;
  background:linear-gradient(155deg,var(--ink-2) 0%,var(--ink) 58%,#0c2338 100%);
}
.img-frame::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:
    linear-gradient(rgba(191,215,232,.13) 1px,transparent 1px),
    linear-gradient(90deg,rgba(191,215,232,.13) 1px,transparent 1px);
  background-size:44px 44px;opacity:.6;
}
.img-frame::after{
  content:"";position:absolute;right:-12%;top:-28%;width:72%;aspect-ratio:1;z-index:0;
  border-radius:50%;filter:blur(8px);
  background:radial-gradient(circle,rgba(53,224,200,.34),rgba(53,224,200,0) 66%);
}
.img-frame img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--tall{aspect-ratio:4/5}

/* grids */
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--halves{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--thirds{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

/* filter */
.filter{display:flex;flex-wrap:wrap;gap:8px}
.filter__btn{
  padding:8px 16px;border-radius:var(--pill);
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;
  color:var(--ink-2);background:transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.filter__btn:hover{border-color:var(--ink);background:rgba(10,27,46,.06)}
.filter__btn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.surface-dark .filter__btn{border-color:var(--line-inv);color:var(--ice)}
.surface-dark .filter__btn[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}

/* reveal */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.22,.61,.36,1);
  transition-delay:calc(var(--i,0) * 60ms);
}
[data-reveal].is-in{opacity:1;transform:none}

/* =========================================================
   ≥1024px — desktop rail
   ========================================================= */
@media (min-width:1024px){
  .rail{
    flex-direction:column;align-items:stretch;gap:0;
    padding:26px 0 22px;height:100%;
    border-bottom:0;border-right:1px solid var(--line-inv);
  }
  .brand{flex-direction:column;align-items:flex-start;gap:14px;padding:0 24px 4px}
  .brand__mark{font-size:1.5rem;padding:7px 13px;border-radius:12px}
  .brand__name{font-size:1.125rem;letter-spacing:.01em}
  .brand__tag{font-size:.6875rem;letter-spacing:.3em}

  .nav-toggle{display:none}
  .nav-scrim{display:none}

  .rail__foot{
    order:2;margin:auto 0 0;padding:18px 24px 0;
    flex-direction:column;align-items:flex-start;gap:12px;
  }
  .rail__note{
    display:block;font-size:.75rem;line-height:1.65;letter-spacing:.03em;color:var(--slate);
  }
  .rail__axis{
    display:block;position:absolute;right:0;top:0;width:2px;z-index:2;
    height:calc(var(--progress,0) * 100%);
    background:var(--cyan);
    box-shadow:0 0 10px rgba(53,224,200,.65);
  }

  .site-nav{
    position:static;opacity:1;visibility:visible;transform:none;
    max-height:none;overflow:visible;
    flex:1;z-index:auto;
    padding:0;background:transparent;border:0;border-radius:0;box-shadow:none;
  }
  .site-nav__cap{padding:24px 24px 12px}
  .site-nav__list{position:relative;gap:0;padding:0 14px 0 24px}
  .site-nav__list::before{
    content:"";position:absolute;left:40px;top:10px;bottom:10px;width:1px;
    background:var(--line-inv);
  }
  .site-nav__link{padding:9px 10px 9px 0;border-radius:12px;gap:14px}
  .site-nav__num{
    width:32px;text-align:center;font-size:.6875rem;padding:3px 0;
    background:var(--ink);border-radius:5px;position:relative;z-index:1;
    letter-spacing:0;
  }
  .site-nav__label{font-size:.9375rem}
  .site-nav__link:hover,.site-nav__link:focus-visible{
    background:transparent;transform:translateX(3px);
  }
  .site-nav__link[aria-current="page"]{background:transparent}
  .site-nav__link[aria-current="page"]::before{
    left:auto;right:2px;width:4px;height:4px;border-radius:50%;
  }
  .site-nav__foot{display:none}

  .footer__grid{grid-template-columns:1.35fr 1fr 1fr 1.25fr}
  .footer__inner{padding-block:clamp(56px,5vw,80px) 0}
}

@media (min-width:620px) and (max-width:1023px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__col--brand{grid-column:1 / -1}
}

/* =========================================================
   MOTION 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;
  }
  [data-reveal]{opacity:1;transform:none;transition:none}
  .version-chip__dot{animation:none}
  .rail__axis,.progress-bar__fill{box-shadow:none}
}