:root{
  --paper:#F7F1E6;
  --paper-2:#FFFCF4;
  --ink-green:#173F35;
  --ink-green-2:#0F2F27;
  --ink:#1D2521;
  --ink-soft:#555F59;
  --sakura:#F2B8C6;
  --sakura-soft:#FBE4EA;
  --sakura-deep:#7A2F42;
  --summer:#2F6F8F;
  --summer-deep:#1C4E66;
  --autumn:#C56A3A;
  --autumn-deep:#7C3A1D;
  --winter:#CBD4D0;
  --search:#0B63CE;
  --download:#B83A24;
  --rule:#2A2F2B;
  --rule-soft:rgba(42,47,43,.18);
  --footer-ink:#E7E3D6;
  --header-h:76px;
  --wrap:1180px;
  --gutter:clamp(18px,4vw,40px);
  --r-s:8px;
  --r-m:14px;
  --r-l:24px;
  --shadow-1:0 1px 0 rgba(29,37,33,.05),0 14px 30px -24px rgba(23,63,53,.55);
  --shadow-2:0 1px 0 rgba(29,37,33,.06),0 22px 36px -26px rgba(23,63,53,.7);
  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.72,.28,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,picture{display:block;max-width:100%}
[hidden]{display:none !important}

body{
  display:flex;
  flex-direction:column;
  min-height:100vh;
  background-color:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:clamp(16px,.55vw + 14.5px,18px);
  line-height:1.9;
  letter-spacing:.002em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{flex:1 0 auto;display:block}
#main-content:focus{outline:none}

::selection{background:var(--sakura);color:var(--ink-green)}

h1,h2,h3,h4{font-family:var(--font-head);font-weight:700;line-height:1.14;color:var(--ink-green);letter-spacing:.005em}
h1{font-size:clamp(34px,5.4vw,68px);line-height:1.05;font-weight:800}
h2{font-size:clamp(25px,3.2vw,38px)}
h3{font-size:clamp(18px,1.9vw,23px);line-height:1.32}
h4{font-size:clamp(16px,1.5vw,18px);line-height:1.4}
p{text-wrap:pretty}

:where(a,button,summary,[tabindex],input,select,textarea):focus-visible{
  outline:2px solid var(--search);
  outline-offset:3px;
  border-radius:4px;
}

.mono{font-family:var(--font-mono);font-size:.92em;letter-spacing:.01em;font-variant-numeric:tabular-nums}
.display{font-family:var(--font-head);font-weight:800;font-size:clamp(44px,8.6vw,108px);line-height:.94;letter-spacing:-.025em;color:var(--ink-green)}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.85;color:var(--ink-soft);max-width:34ch}
.muted{color:var(--ink-soft)}
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--summer-deep)}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(52px,7.5vw,100px)}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 22px;margin-bottom:clamp(20px,3vw,34px)}
.divider{height:1px;background:var(--rule-soft);border:0;margin-block:clamp(20px,3vw,34px)}

.grid{display:grid;gap:clamp(16px,2.4vw,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))}

.prose{max-width:38em;font-size:17px;line-height:1.95;color:var(--ink)}
.prose p+p{margin-top:1.05em}
.prose h2{margin-top:1.7em;margin-bottom:.55em}
.prose h3{margin-top:1.4em;margin-bottom:.45em}
.prose ul,.prose ol{list-style:revert;padding-left:1.4em;margin-block:1em}
.prose li+li{margin-top:.4em}
.prose a{color:var(--summer-deep);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--ink-green)}
.prose blockquote{border-left:3px solid var(--sakura);padding-left:16px;color:var(--ink-soft)}
.prose code{font-family:var(--font-mono);font-size:.9em;background:rgba(203,212,208,.4);padding:.1em .35em;border-radius:4px}

.breadcrumb{font-family:var(--font-head);font-size:13px;letter-spacing:.03em;color:var(--ink-soft);padding-block:16px}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--rule-soft)}
.breadcrumb a:hover{color:var(--ink-green);text-decoration:underline;text-underline-offset:3px}
.breadcrumb [aria-current="page"]{color:var(--ink-green)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.03em;white-space:nowrap;
  padding:9px 17px;border-radius:999px;border:1px solid var(--rule);
  color:var(--ink-green);background:transparent;cursor:pointer;
  transition:transform .16s var(--ease),background .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease),border-color .16s var(--ease);
}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-1)}
.btn:active{transform:translateY(1px) scale(.99);box-shadow:none}
.btn-ghost{background:rgba(255,252,244,.62)}
.btn-ghost:hover{background:var(--paper-2);border-color:var(--ink-green)}
.btn-solid{background:var(--ink-green);border-color:var(--ink-green);color:var(--paper)}
.btn-solid:hover{background:var(--ink-green-2);color:var(--paper)}
.btn-search{background:var(--search);border-color:var(--search);color:#fff}
.btn-search:hover{background:#0A55B0;color:#fff}
.btn-download{background:var(--download);border-color:var(--download);color:#fff}
.btn-download:hover{background:#9E301D;color:#fff}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--rule);border-radius:999px;
  font-family:var(--font-head);font-size:12px;letter-spacing:.12em;line-height:1.7;
  color:var(--ink);background:var(--paper-2);
}
.tag--spring{background:var(--sakura-soft);border-color:var(--sakura-deep);color:var(--sakura-deep)}
.tag--summer{background:#E7EFF4;border-color:var(--summer-deep);color:var(--summer-deep)}
.tag--autumn{background:#F7E7DD;border-color:var(--autumn-deep);color:var(--autumn-deep)}
.tag--winter{background:var(--winter);border-color:#4C5E57;color:#22302B}

/* ---------- paper card / media ---------- */
.paper-card{
  position:relative;background:var(--paper-2);
  border:1px solid var(--rule);border-radius:var(--r-m);
  padding:clamp(20px,2.6vw,30px);
  box-shadow:var(--shadow-1);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.paper-card::before{
  content:"";position:absolute;left:-1px;top:16px;bottom:16px;width:3px;
  border-radius:0 3px 3px 0;background:var(--season,var(--ink-green));
}
.paper-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2)}

.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--rule);border-radius:var(--r-m);
  background:var(--winter);aspect-ratio:4/3;
}
.media-frame > img,.media-frame > svg{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame figcaption{
  position:absolute;left:12px;bottom:12px;right:12px;
  font-family:var(--font-head);font-size:12px;letter-spacing:.08em;
  background:rgba(247,241,230,.9);color:var(--ink-green);
  padding:5px 10px;border-radius:6px;border:1px solid var(--rule-soft);
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:12px;z-index:400;
  transform:translateY(-180%);
  background:var(--ink-green);color:var(--paper);
  padding:10px 18px;border-radius:999px;
  font-family:var(--font-head);font-size:14px;letter-spacing:.08em;
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline:2px solid var(--paper);outline-offset:2px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:200;
  background:transparent;
  color:var(--ink);
  border-bottom:1px solid transparent;
  transition:background-color .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.site-header::after{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(180deg,rgba(247,241,230,.88),rgba(247,241,230,0));
  transition:opacity .22s var(--ease);
}
.site-header[data-scrolled]{
  background-color:rgba(247,241,230,.96);
  border-bottom-color:var(--rule);
  box-shadow:0 14px 26px -26px rgba(29,37,33,.85);
}
.site-header[data-scrolled]::after{opacity:0}

.header-seasons{position:absolute;inset:0 0 auto 0;height:4px;display:grid;grid-template-columns:repeat(4,1fr)}
.header-seasons i{display:block;height:100%}
.header-seasons i:nth-child(1){background:var(--sakura)}
.header-seasons i:nth-child(2){background:var(--summer)}
.header-seasons i:nth-child(3){background:var(--autumn)}
.header-seasons i:nth-child(4){background:var(--winter)}

.header-inner{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;gap:clamp(10px,1.6vw,24px);
}

.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;color:var(--ink-green);border-radius:12px}
.brand-mark{
  width:32px;height:32px;padding:5px;flex:0 0 auto;
  display:grid;grid-template-columns:1fr 1fr;gap:3px;
  border:1px solid var(--rule);border-radius:10px;background:var(--paper-2);
  transition:transform .3s var(--ease);
}
.brand-mark i{display:block;border-radius:50% 50% 50% 50%/48% 48% 52% 52%}
.brand-mark i:nth-child(1){background:var(--sakura)}
.brand-mark i:nth-child(2){background:var(--summer)}
.brand-mark i:nth-child(3){background:var(--autumn)}
.brand-mark i:nth-child(4){background:var(--winter)}
.brand:hover .brand-mark{transform:rotate(-8deg)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-head);font-size:17px;font-weight:700;letter-spacing:.06em}
.brand-tag{font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:var(--ink-soft);margin-top:3px}

.site-nav{display:flex;align-items:center;justify-content:center;flex:1 1 auto;min-width:0;gap:clamp(6px,1vw,16px)}
.nav-list{display:flex;align-items:center;gap:clamp(3px,.8vw,9px)}
.nav-list a{
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
  padding:8px 10px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-head);font-size:clamp(13px,1.05vw,14px);font-weight:500;
  letter-spacing:.02em;color:#2E3A34;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.nav-index{font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;color:var(--summer-deep);opacity:.85}
.nav-list a:hover{background:var(--paper-2);border-color:var(--rule-soft)}
.nav-list a[aria-current="page"]{background:var(--ink-green);border-color:var(--ink-green);color:var(--paper)}
.nav-list a[aria-current="page"] .nav-index{color:var(--sakura);opacity:1}

.nav-quick{display:none}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.header-actions .btn{padding:8px 15px;font-size:13.5px}

.progress{position:absolute;left:0;right:0;bottom:0;height:2px;pointer-events:none;background:transparent}
.progress i{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--sakura),var(--summer) 38%,var(--autumn) 70%,var(--ink-green));
}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 15px;border:1px solid var(--rule);border-radius:999px;
  font-family:var(--font-head);font-size:13.5px;font-weight:600;letter-spacing:.1em;
  color:var(--ink-green);background:rgba(255,252,244,.7);
}
.nav-toggle-bars{position:relative;display:inline-block;width:18px;height:12px}
.nav-toggle-bars i{position:absolute;left:0;width:100%;height:1.5px;border-radius:2px;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle-bars i:nth-child(1){top:0}
.nav-toggle-bars i:nth-child(2){top:50%;margin-top:-.75px}
.nav-toggle-bars i:nth-child(3){bottom:0}
.site-header[data-open] .nav-toggle{background:var(--ink-green);border-color:var(--ink-green);color:var(--paper)}
.site-header[data-open] .nav-toggle-bars i:nth-child(1){transform:translateY(5.25px) 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(-5.25px) rotate(-45deg)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;margin-top:clamp(56px,8vw,110px);
  background:var(--ink-green);color:var(--footer-ink);
}
.footer-seasons{display:grid;grid-template-columns:repeat(4,1fr);height:6px}
.footer-seasons i{display:block;height:100%}
.footer-seasons i:nth-child(1){background:var(--sakura)}
.footer-seasons i:nth-child(2){background:var(--summer)}
.footer-seasons i:nth-child(3){background:var(--autumn)}
.footer-seasons i:nth-child(4){background:var(--winter)}

.footer-inner{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:clamp(40px,5.6vw,72px) var(--gutter) clamp(24px,3.4vw,38px);
  display:grid;gap:clamp(26px,3.6vw,52px);
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.55fr) minmax(0,1fr);
  align-items:start;
}
.footer-mark{font-family:var(--font-head);font-size:clamp(25px,3vw,36px);font-weight:800;line-height:1.1;color:#FBF7EC;letter-spacing:.02em}
.footer-tag{margin-top:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.34em;color:var(--sakura)}
.footer-note{margin-top:16px;font-size:15px;line-height:1.85;color:rgba(231,227,214,.72);max-width:28ch}

.footer-map{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px)}
.footer-col h3{font-family:var(--font-head);font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--sakura);margin-bottom:14px}
.footer-links li+li{margin-top:9px}
.footer-links a{font-family:var(--font-head);font-size:15px;color:var(--footer-ink);transition:color .16s var(--ease)}
.footer-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--sakura)}

.footer-contact h3{font-family:var(--font-head);font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--sakura);margin-bottom:14px}
.footer-contact-list li{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:baseline;
  padding-block:8px;border-bottom:1px dashed rgba(231,227,214,.18);
}
.footer-contact-label{font-family:var(--font-head);font-size:12px;letter-spacing:.14em;color:rgba(231,227,214,.6);white-space:nowrap}
.footer-contact-list .mono{color:#F5F1E5;font-size:13.5px;word-break:break-word}
.footer-contact-list span:last-child{font-size:14.5px}
.footer-contact-note{margin-top:14px;font-size:13px;line-height:1.8;color:rgba(231,227,214,.62)}

.footer-legal{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:18px var(--gutter) clamp(22px,3vw,30px);
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  border-top:1px solid rgba(231,227,214,.2);
  font-family:var(--font-head);font-size:13px;color:rgba(231,227,214,.66);
}
.footer-copy{letter-spacing:.04em}
.footer-icp{font-family:var(--font-mono);font-size:12px;letter-spacing:.02em}
.legal-links{display:flex;flex-wrap:wrap;gap:18px;margin-left:auto}
.legal-links a{color:rgba(231,227,214,.78);transition:color .16s var(--ease)}
.legal-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}

/* ---------- tabs ---------- */
.tab-list{
  display:flex;flex-wrap:wrap;gap:6px;width:max-content;max-width:100%;
  padding:6px;border:1px solid var(--rule);border-radius:var(--r-m);
  background:var(--paper-2);
}
.tab{
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.04em;
  padding:8px 18px;border-radius:10px;color:var(--ink-soft);cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.tab:hover{color:var(--ink-green);background:rgba(203,212,208,.35)}
.tab[aria-selected="true"]{background:var(--ink-green);color:var(--paper)}
.tab-panel{padding-top:clamp(18px,2.6vw,28px)}
.tab-panel[hidden]{display:none}

/* ---------- accordion ---------- */
.accordion{border-top:1px solid var(--rule)}
.accordion-item{border-bottom:1px solid var(--rule-soft)}
.accordion-trigger{
  display:flex;width:100%;align-items:center;justify-content:space-between;gap:16px;
  text-align:left;padding:18px 4px;
  font-family:var(--font-head);font-size:17px;font-weight:600;color:var(--ink-green);
}
.accordion-trigger::after{
  content:"+";font-family:var(--font-mono);font-size:20px;line-height:1;color:var(--autumn-deep);
  transition:transform .2s var(--ease);
}
.accordion-trigger[aria-expanded="true"]::after{transform:rotate(45deg)}
.accordion-trigger:hover{color:var(--summer-deep)}
.accordion-panel{padding:0 4px 20px;color:var(--ink-soft);font-size:16px}
.accordion-panel[hidden]{display:none !important}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(10px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1.35fr)}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:900px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:700px){
  .footer-inner{grid-template-columns:1fr}
  .footer-map{grid-template-columns:repeat(2,minmax(0,1fr))}
  .legal-links{margin-left:0;width:100%}
}
@media (max-width:600px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
}

@media (max-width:1179px){
  :root{--header-h:64px}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    display:block;margin:0;flex:none;
    padding:16px var(--gutter) 26px;
    background-color:var(--paper);
    border-bottom:1px solid var(--rule);
    box-shadow:0 26px 44px -32px rgba(29,37,33,.9);
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .site-header[data-open] .site-nav{
    opacity:1;visibility:visible;pointer-events:auto;transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-list a{
    justify-content:flex-start;
    font-size:17px;padding:13px 12px;border-radius:12px;
    border-bottom:1px solid var(--rule-soft);border-left:0;border-right:0;border-top:0;
  }
  .nav-list a[aria-current="page"]{border-bottom-color:var(--ink-green)}
  .nav-list a:hover{background:var(--paper-2);border-color:var(--rule-soft)}
  .nav-quick{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
  .nav-quick .btn{flex:1 1 140px;padding:12px 16px;font-size:14.5px}
  .brand-name{font-size:16px}
  .nav-toggle-text{font-size:12.5px;letter-spacing:.14em}
}

@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}
  .site-header[data-open] .site-nav{transform:none}
}