*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,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%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

:root{
  --ink:#080C11;
  --panel:#121B24;
  --slate:#1C2833;
  --paper:#F3F6F4;
  --line:#2A3742;
  --muted:#93A2B0;
  --spring:#2ED47A;
  --summer:#FF7A3D;
  --autumn:#E8B33C;
  --winter:#5B9BFF;
  --shell:1200px;
  --header-h:84px;
  --shadow-panel:10px 10px 0 rgba(0,0,0,.38);
  --font-sans:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

html{scroll-behavior:smooth}
body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--spring);color:var(--ink)}
:focus-visible{outline:2px solid var(--spring);outline-offset:3px;border-radius:2px}

h1,h2,h3,h4{font-weight:800;line-height:1.22;letter-spacing:-.01em;text-wrap:balance}
h1{font-size:clamp(2.1rem,6vw,3.5rem)}
h2{font-size:clamp(1.55rem,3.6vw,2.25rem)}
h3{font-size:clamp(1.2rem,2.4vw,1.5rem)}
h4{font-size:1.0625rem}
p{text-wrap:pretty;max-width:42em}
b,strong{font-weight:700}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,40px)}
.main-inset{padding-top:calc(var(--header-h) + clamp(28px,6vw,72px))}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:120;
  padding:10px 16px;background:var(--spring);color:var(--ink);
  font-weight:700;font-size:14px;
  transform:translateY(-180%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ===== Header ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,backdrop-filter .25s ease;
}
.site-header[data-scrolled="true"],
.site-header[data-nav-open="true"]{
  background:rgba(8,12,17,.94);
  border-bottom-color:var(--line);
  backdrop-filter:blur(10px);
}
.scroll-progress{
  position:absolute;left:0;bottom:0;width:0;height:2px;
  background:linear-gradient(90deg,var(--spring),var(--summer),var(--autumn),var(--winter));
}
.header-inner{
  display:flex;align-items:center;gap:18px;
  min-height:var(--header-h);
  transition:min-height .25s ease;
}
.site-header[data-scrolled="true"] .header-inner{min-height:64px}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-glyph{
  display:grid;place-items:center;
  width:42px;height:42px;
  background:var(--spring);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  box-shadow:4px 4px 0 rgba(46,212,122,.22);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-size:1.0625rem;font-weight:800;letter-spacing:.02em}
.brand-phase{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--muted);text-transform:uppercase;
}
.brand-phase b{color:var(--spring);font-weight:700}
.brand-code{color:var(--line)}

.header-drawer{display:flex;align-items:center;gap:22px;margin-left:auto;min-width:0}
.site-nav{min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;display:inline-block;
  padding:10px 12px;
  font-size:.9375rem;font-weight:600;
  color:rgba(243,246,244,.78);
  transition:color .2s ease,background .2s ease;
}
.nav-link:hover{color:var(--paper);background:rgba(243,246,244,.06)}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--spring);
}

.header-utility{
  display:flex;align-items:center;gap:14px;
  padding-left:18px;border-left:1px solid var(--line);
}
.season-group{display:flex;border:1px solid var(--line);background:rgba(18,27,36,.72)}
.season-btn{
  display:flex;align-items:center;gap:6px;
  padding:6px 9px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--muted);
  border-right:1px solid var(--line);
  transition:background .18s ease,color .18s ease;
}
.season-btn:last-child{border-right:0}
.season-btn:hover{color:var(--paper);background:rgba(243,246,244,.06)}
.season-btn[aria-pressed="true"]{background:var(--slate);color:var(--paper)}
.season-dot{width:7px;height:7px;border-radius:50%;background:var(--muted)}
.season-dot--spring{background:var(--spring)}
.season-dot--summer{background:var(--summer)}
.season-dot--autumn{background:var(--autumn)}
.season-dot--winter{background:var(--winter)}

.update-status{
  display:flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--muted);
  white-space:nowrap;
}
.status-dot{
  width:8px;height:8px;border-radius:50%;background:var(--autumn);
  animation:status-pulse 1.4s ease-out 1 both;
}
@keyframes status-pulse{
  0%{box-shadow:0 0 0 0 rgba(232,179,60,.55)}
  100%{box-shadow:0 0 0 12px rgba(232,179,60,0)}
}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  margin-left:auto;padding:8px 12px;
  border:1px solid var(--line);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:20px}
.nav-toggle-bars span{height:2px;width:100%;background:var(--paper);transition:transform .22s ease,opacity .22s ease}
.nav-toggle-bars span:nth-child(3){width:70%}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){width:100%;transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{display:inline}

/* ===== Footer ===== */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  background:var(--panel);
  border-top:1px solid var(--line);
}
.footer-strip{display:grid;grid-template-columns:repeat(4,1fr);height:6px}
.footer-strip-cell{display:block}
.footer-strip-cell--spring{background:var(--spring)}
.footer-strip-cell--summer{background:var(--summer)}
.footer-strip-cell--autumn{background:var(--autumn)}
.footer-strip-cell--winter{background:var(--winter)}

.footer-inner{padding-block:clamp(38px,6vw,72px)}
.footer-head{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 24px;
  padding-bottom:26px;border-bottom:1px solid var(--line);
}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand-name{font-size:1.125rem;font-weight:800;letter-spacing:.02em}
.footer-brand-note{
  margin-right:auto;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted);
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr)) minmax(0,1.5fr);
  gap:28px;
  padding:32px 0;
}
.footer-col{min-width:0}
.footer-heading{
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.16em;color:var(--muted);text-transform:uppercase;
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-link{
  font-size:.9375rem;color:rgba(243,246,244,.82);
  transition:color .18s ease;
}
.footer-link:hover{
  color:var(--spring);
  text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--spring);
}
.footer-contact{min-width:0}
.contact-list{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--muted)}
.contact-item{display:flex;gap:10px;align-items:flex-start;max-width:34em}
.contact-key{
  flex:0 0 42px;padding-top:4px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--spring);
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;
  padding-top:22px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted);
}
.footer-legal,.footer-copy{max-width:none}

/* ===== Shared components ===== */
.panel{
  background:var(--panel);
  border:1px solid var(--line);
  box-shadow:var(--shadow-panel);
}
.panel--slate{background:var(--slate)}
.panel--paper{
  background:var(--paper);color:var(--ink);
  border-color:#0B1116;
  box-shadow:12px 12px 0 rgba(0,0,0,.45);
}
.panel-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 16px;
  padding:18px 22px;border-bottom:1px solid var(--line);
}
.panel--paper .panel-head{border-bottom-color:rgba(8,12,17,.14)}
.panel-body{padding:22px}
.panel-note{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--muted);
}
.panel--paper .panel-note{color:#5B6874}

.idx{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--muted);
}
.idx--spring{color:var(--spring)}
.idx--summer{color:var(--summer)}
.idx--autumn{color:var(--autumn)}
.idx--winter{color:var(--winter)}
.index-rule{
  display:flex;align-items:center;gap:14px;width:100%;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--muted);
}
.index-rule::after{content:"";flex:1;height:1px;background:var(--line)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);background:rgba(28,40,51,.7);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--paper);
}
.tag--spring{color:var(--spring);border-color:rgba(46,212,122,.45);background:rgba(46,212,122,.1)}
.tag--summer{color:var(--summer);border-color:rgba(255,122,61,.45);background:rgba(255,122,61,.1)}
.tag--autumn{color:var(--autumn);border-color:rgba(232,179,60,.45);background:rgba(232,179,60,.1)}
.tag--winter{color:var(--winter);border-color:rgba(91,155,255,.45);background:rgba(91,155,255,.1)}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;
  background:var(--spring);color:var(--ink);
  border:1px solid var(--spring);
  font-size:.9375rem;font-weight:700;
  box-shadow:5px 5px 0 rgba(0,0,0,.35);
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{transform:translateY(-2px);box-shadow:7px 7px 0 rgba(0,0,0,.42)}
.btn--ghost{
  background:transparent;color:var(--paper);
  border-color:var(--line);box-shadow:none;
}
.btn--ghost:hover{
  color:var(--spring);border-color:var(--spring);
  background:rgba(46,212,122,.08);box-shadow:none;
}
.btn--sm{padding:8px 14px;font-size:.8125rem}

.crumb{
  display:flex;flex-wrap:wrap;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.crumb li:not(:last-child)::after{content:"/";margin-left:8px;color:var(--line)}
.crumb a:hover{color:var(--spring)}
.crumb [aria-current="page"]{color:var(--paper)}

.divider{height:1px;border:0;background:var(--line)}

.grid{display:grid;gap:clamp(18px,3vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{
  display:grid;
  grid-template-columns:minmax(0,2.2fr) minmax(0,1fr);
  gap:clamp(20px,3.4vw,40px);
  align-items:start;
}

.stat{display:flex;flex-direction:column;gap:4px}
.stat-value{
  font-family:var(--font-mono);font-weight:700;line-height:1;
  font-size:clamp(2.4rem,7vw,4.5rem);letter-spacing:-.02em;
}
.stat-label{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted);
}

.timeline{position:relative;padding-left:22px}
.timeline::before{
  content:"";position:absolute;left:4px;top:8px;bottom:8px;width:1px;background:var(--line);
}
.timeline-item{position:relative;padding-bottom:20px}
.timeline-item::before{
  content:"";position:absolute;left:-22px;top:9px;
  width:9px;height:9px;border-radius:50%;background:var(--spring);
}
.timeline-time{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}

.img-frame{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16 / 9;
  background:var(--slate);
  border:1px solid var(--line);
}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(147,162,176,.16) 0 1px,transparent 1px 28px),
    repeating-linear-gradient(90deg,rgba(147,162,176,.16) 0 1px,transparent 1px 28px);
}
.img-frame > img{width:100%;height:100%;object-fit:cover}
.img-frame--4x3{aspect-ratio:4 / 3}
.img-frame--1x1{aspect-ratio:1 / 1}
.img-frame--21x9{aspect-ratio:21 / 9}
.img-caption{
  margin-top:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted);
}

.reveal{transition:opacity .5s ease,transform .5s ease}
html[data-motion="on"] .reveal:not(.is-visible){opacity:0;transform:translateY(14px)}

/* ===== Responsive ===== */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:980px){
  .header-inner{min-height:70px}
  .nav-toggle{display:inline-flex}
  .header-drawer{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    margin:0;padding:0 clamp(18px,4vw,40px);
    background:rgba(8,12,17,.97);
    border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;opacity:0;
    transition:max-height .26s ease,opacity .2s ease;
  }
  .header-drawer[data-open]{
    max-height:min(78vh,640px);overflow:auto;
    opacity:1;padding-bottom:20px;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding-top:8px}
  .nav-link{
    padding:14px 2px;font-size:1rem;
    border-bottom:1px solid var(--line);
  }
  .nav-link:hover{background:none}
  .nav-link[aria-current="page"]::after{left:0;right:auto;bottom:-1px;width:28px}
  .header-utility{
    flex-direction:column;align-items:flex-start;gap:14px;
    padding:18px 0 0;border-left:0;
  }
  .season-btn{padding:8px 12px;font-size:13px}
  .split{grid-template-columns:minmax(0,1fr)}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.72}
  .brand-glyph{width:38px;height:38px}
  .brand-phase{font-size:10px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer-head{align-items:flex-start}
  .footer-brand-note{margin-right:0;flex-basis:100%}
  .panel-body{padding:18px}
  .panel-head{padding:16px 18px}
}

@media (max-width:420px){
  .brand-phase{display:none}
  .nav-toggle-label{display:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .status-dot{animation:none}
  .reveal,html[data-motion="on"] .reveal:not(.is-visible){
    opacity:1;transform:none;
  }
}