*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:#F7F3EC}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
[hidden]{display:none!important}

:root{
  --paper:#F7F3EC;
  --paper-2:#E7E1D6;
  --ink:#1C1A17;
  --ink-2:#4A4640;
  --spring:#6E9C58;
  --spring-soft:#E4C3C0;
  --summer:#2F7FA6;
  --summer-bright:#F0BE2E;
  --autumn:#C4622D;
  --autumn-soft:#D9A94C;
  --winter:#2B3A67;
  --frost:#EEF2F4;
  --accent:#6E9C58;
  --accent-soft:#E4C3C0;
  --accent-ink:#22331A;
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --bar-h:56px;
  --rail-w:64px;
  --nav-h:42px;
  --frame-top:99px;
  --frame-left:64px;
  --line:1px solid rgba(28,26,23,.16);
  --line-strong:1px solid #1C1A17;
  --radius:2px;
  --ease:cubic-bezier(.2,0,0,1);
  --shadow-soft:0 2px 8px rgba(28,26,23,.10);
  --shadow:0 6px 18px rgba(28,26,23,.14);
}
html[data-season="spring"]{--accent:#6E9C58;--accent-soft:#E4C3C0;--accent-ink:#22331A}
html[data-season="summer"]{--accent:#2F7FA6;--accent-soft:#F0BE2E;--accent-ink:#0C2734}
html[data-season="autumn"]{--accent:#C4622D;--accent-soft:#D9A94C;--accent-ink:#3A1A08}
html[data-season="winter"]{--accent:#2B3A67;--accent-soft:#EEF2F4;--accent-ink:#EEF2F4}

body{
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  color:var(--ink);
  background:var(--paper);
  padding-top:var(--frame-top);
  padding-left:var(--frame-left);
  -webkit-font-smoothing:antialiased;
}
body::selection{background:var(--accent-soft);color:var(--ink)}

h1,h2,h3,h4,h5{font-weight:900;line-height:1.12;letter-spacing:-.02em}
h1{font-size:clamp(40px,5.6vw,64px)}
h2{font-size:clamp(28px,3.4vw,48px)}
h3{font-size:clamp(22px,2.3vw,34px)}
h4{font-size:clamp(18px,1.6vw,26px)}
p{max-width:68ch}

.mono{font-family:var(--font-mono);letter-spacing:.04em;font-size:.86em}
strong{font-weight:800}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:1px}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  transform:translateY(-240%);
  background:var(--ink);color:var(--frost);
  padding:10px 16px;font-size:14px;font-weight:800;
  text-decoration:none;border-radius:var(--radius);
  transition:transform 160ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- L 形框架：顶部条 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:90;font-size:14px}
.frame-bar{position:relative;background:var(--paper);border-bottom:var(--line-strong)}
.frame-bar__inner{
  display:grid;grid-template-columns:auto minmax(120px,1fr) auto;
  align-items:center;gap:16px;
  height:var(--bar-h);padding:0 20px;
  max-width:1600px;margin:0 auto;
}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}
.brand__mark{
  display:grid;place-items:center;width:28px;height:28px;flex:none;
  border:var(--line-strong);background:var(--accent);color:var(--accent-ink);
  font-weight:900;font-size:14px;line-height:1;border-radius:1px;
  transition:background 160ms var(--ease),color 160ms var(--ease);
}
.brand__text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.brand__name{font-weight:900;font-size:15px;letter-spacing:-.01em;white-space:nowrap}
.brand__sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--ink-2);margin-top:3px;white-space:nowrap}

.search-slot{display:flex;align-items:center;gap:10px;min-width:0}
.search-slot__label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:var(--ink-2);white-space:nowrap;
}
.search-slot__field{
  position:relative;display:flex;align-items:center;gap:8px;
  flex:1 1 auto;min-width:0;height:34px;
  border-bottom:1px solid var(--ink);
  transition:border-color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.search-slot__field:focus-within{border-bottom-color:var(--accent);box-shadow:0 2px 0 -1px var(--accent)}
.search-slot__icon{
  position:relative;width:11px;height:11px;flex:none;
  border:1.5px solid var(--ink-2);border-radius:50%;opacity:.8;
}
.search-slot__icon::after{content:"";position:absolute;right:-4px;bottom:-3px;width:6px;height:1.5px;background:var(--ink-2);transform:rotate(45deg)}
.search-slot__input{
  flex:1 1 auto;min-width:0;border:0;background:transparent;
  font-size:14px;line-height:1.4;padding:4px 0;outline:none;
}
.search-slot__input::placeholder{color:rgba(74,70,64,.62)}
.search-slot__input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.search-slot__count{font-size:11px;color:var(--ink-2);white-space:nowrap}

.bar-actions{display:flex;align-items:center;gap:10px;justify-self:end}
.quick-return{
  display:inline-flex;align-items:center;gap:7px;
  text-decoration:none;font-weight:800;font-size:13px;
  padding:6px 10px;border:var(--line);border-radius:var(--radius);
  background:var(--paper);white-space:nowrap;
  transition:background 160ms var(--ease),border-color 160ms var(--ease);
}
.quick-return:hover{background:var(--accent-soft);border-color:var(--ink)}
.quick-return__dot{width:7px;height:7px;flex:none;border-radius:50%;background:var(--accent);transition:background 160ms var(--ease)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:8px;height:34px;padding:0 12px;
  border:var(--line-strong);border-radius:var(--radius);
  background:var(--ink);color:var(--paper);
  font-weight:800;font-size:13px;cursor:pointer;
  transition:background 160ms var(--ease),color 160ms var(--ease);
}
.nav-toggle:hover{background:var(--accent);color:var(--accent-ink)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:14px}
.nav-toggle__bars i{display:block;height:2px;background:currentColor;transition:transform 160ms var(--ease)}
.site-header[data-open] .nav-toggle__bars i:first-child{transform:translateY(2.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:last-child{transform:translateY(-2.5px) rotate(-45deg)}
.nav-toggle__text{line-height:1}

/* ---------- 导航 ---------- */
.site-nav{display:none;border-top:var(--line-strong);background:var(--paper)}
.site-nav__inner{display:flex;flex-direction:column;gap:12px}
.site-nav__list{display:flex;flex-direction:column;gap:0}
.site-nav__list a{
  display:block;padding:12px 0;font-size:16px;font-weight:800;
  text-decoration:none;color:var(--ink-2);
  border-bottom:var(--line);
  transition:color 160ms var(--ease),background 160ms var(--ease);
}
.site-nav__list a:hover{color:var(--ink)}
.site-nav__list a[aria-current="page"]{
  color:var(--ink);
  background:linear-gradient(90deg,var(--accent-soft),transparent 72%);
  border-bottom-color:var(--ink);
}
.site-nav__note{font-size:11px;letter-spacing:.12em;color:var(--ink-2);font-family:var(--font-mono)}

@media (max-width:899px){
  .site-header[data-open] .site-nav{
    display:block;
    padding:10px 20px 20px;
    box-shadow:var(--shadow);
    max-height:calc(100vh - var(--frame-top));
    overflow-y:auto;
  }
}

@media (min-width:900px){
  .site-nav{display:block;border-top:var(--line)}
  .site-nav__inner{
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:24px;height:var(--nav-h);padding:0 20px;
    max-width:1600px;margin:0 auto;
  }
  .site-nav__list{flex-direction:row;align-items:center;gap:26px}
  .site-nav__list a{
    padding:0;border-bottom:2px solid transparent;background:none;
    font-size:14px;line-height:var(--nav-h);height:var(--nav-h);
  }
  .site-nav__list a:hover{color:var(--ink);border-bottom-color:rgba(28,26,23,.35)}
  .site-nav__list a[aria-current="page"]{
    color:var(--ink);border-bottom-color:var(--accent);background:none;
  }
  .nav-toggle{display:none}
}

/* ---------- 阅读进度 ---------- */
.read-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(28,26,23,.10);overflow:hidden}
.read-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:var(--accent);
  transition:transform 120ms linear,background 160ms var(--ease);
}

/* ---------- L 形框架：季节轨道 ---------- */
.season-rail{display:flex;align-items:center;gap:12px;padding:6px 20px;background:var(--paper);border-bottom:var(--line-strong);overflow-x:auto}
.season-rail__label{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--ink-2);white-space:nowrap}
.season-rail__set{display:flex;align-items:center;gap:6px}
.season-rail__hint{display:none;font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--ink-2)}

.season-btn{
  display:inline-flex;flex-direction:row;align-items:center;justify-content:center;gap:5px;
  min-width:40px;height:34px;padding:0 8px;
  border:var(--line);border-radius:var(--radius);
  background:var(--paper);color:var(--ink-2);
  font-size:12px;font-weight:800;cursor:pointer;
  transition:background 160ms var(--ease),color 160ms var(--ease),border-color 160ms var(--ease);
}
.season-btn:hover{border-color:var(--ink);background:var(--paper-2);color:var(--ink)}
.season-btn__chip{display:block;width:10px;height:10px;flex:none;border:1px solid rgba(28,26,23,.28);background:var(--paper-2)}
.season-btn[data-season="spring"] .season-btn__chip{background:var(--spring)}
.season-btn[data-season="summer"] .season-btn__chip{background:var(--summer)}
.season-btn[data-season="autumn"] .season-btn__chip{background:var(--autumn)}
.season-btn[data-season="winter"] .season-btn__chip{background:var(--winter)}
.season-btn__glyph{line-height:1}
.season-btn[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.season-btn[aria-pressed="true"] .season-btn__chip{outline:1px solid var(--paper);outline-offset:1px}

@media (min-width:900px){
  .season-rail{
    position:fixed;left:0;top:var(--frame-top);bottom:0;width:var(--rail-w);z-index:89;
    display:flex;flex-direction:column;align-items:center;gap:14px;
    padding:16px 0;border-right:var(--line-strong);border-bottom:0;
    overflow-y:auto;overflow-x:hidden;background:var(--paper);
  }
  .season-rail__label{writing-mode:vertical-rl;letter-spacing:.32em;margin-bottom:2px}
  .season-rail__set{flex-direction:column;gap:8px}
  .season-rail__hint{display:block;writing-mode:vertical-rl;margin-top:auto;letter-spacing:.24em}
  .season-btn{flex-direction:column;width:36px;min-width:0;height:46px;padding:0;gap:4px}
}

@media (max-width:899px){
  :root{--frame-top:104px;--frame-left:0}
}

/* ---------- 内容容器与栅格 ---------- */
.site-main{display:block}
.site-main:focus{outline:none}
.wrap{width:min(100% - 40px,1240px);margin-inline:auto}
.stack{display:flex;flex-direction:column;gap:clamp(12px,1.6vw,20px)}
.section{padding-block:clamp(36px,5.4vw,80px);border-bottom:var(--line)}
.section--tight{padding-block:clamp(22px,3vw,40px)}
.rule{height:1px;border:0;background:rgba(28,26,23,.16);margin:0}
.note{font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;color:var(--ink-2);line-height:1.8}

.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,28px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}
@media (max-width:1023px){
  .col-3,.col-4,.col-5{grid-column:span 6}
  .col-7,.col-8,.col-9{grid-column:span 12}
}
@media (max-width:639px){
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9{grid-column:span 12}
}

/* ---------- 页头 / 面包屑 ---------- */
.breadcrumb{padding-block:12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--ink-2)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.breadcrumb li{display:inline-flex;align-items:center;gap:6px}
.breadcrumb li+li::before{content:"/";color:rgba(74,70,64,.5)}
.breadcrumb a{text-decoration:none;border-bottom:1px solid transparent;transition:border-color 160ms var(--ease)}
.breadcrumb a:hover{border-bottom-color:var(--accent)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

.page-head{padding-block:clamp(26px,3.6vw,52px) clamp(20px,3vw,36px);border-bottom:var(--line)}
.page-head h1{max-width:19ch}
.lede{margin-top:clamp(12px,1.6vw,20px);font-size:clamp(17px,1.4vw,20px);line-height:1.8;color:var(--ink-2);max-width:46ch}

.section-head{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,2vw,28px);align-items:end;margin-bottom:clamp(18px,2.6vw,34px)}
.section-head__title{grid-column:span 7}
.section-head__note{grid-column:span 5;font-family:var(--font-mono);font-size:12px;line-height:1.8;color:var(--ink-2)}
@media (max-width:767px){
  .section-head__title,.section-head__note{grid-column:span 12}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:44px;padding:11px 20px;
  border:var(--line-strong);border-radius:var(--radius);
  background:transparent;color:var(--ink);
  font-size:15px;font-weight:800;text-decoration:none;cursor:pointer;
  transition:background 160ms var(--ease),color 160ms var(--ease),border-color 160ms var(--ease);
}
.btn:hover{background:var(--ink);color:var(--paper)}
.btn--solid{background:var(--accent);color:var(--accent-ink);border-color:var(--ink)}
.btn--solid:hover{background:var(--ink);color:var(--paper)}
.btn--ghost{background:var(--paper)}
.btn--sm{min-height:36px;padding:6px 14px;font-size:13px}
.btn--arrow::after{content:"→";font-family:var(--font-mono);letter-spacing:0}

/* ---------- 标签 / 卡片 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--ink-2);border:var(--line);border-radius:1px;
  padding:5px 10px;background:var(--paper);
}
.eyebrow::before{content:"";display:block;width:7px;height:7px;background:var(--accent);flex:none}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  padding:3px 8px;border:var(--line);border-radius:1px;
  background:var(--paper);color:var(--ink-2);white-space:nowrap;
}
.tag--spring{border-color:var(--spring);color:#3B5A2D;background:rgba(110,156,88,.14)}
.tag--summer{border-color:var(--summer);color:#1C4F6B;background:rgba(47,127,166,.12)}
.tag--autumn{border-color:var(--autumn);color:#7C3A16;background:rgba(196,98,45,.12)}
.tag--winter{border-color:var(--winter);color:#1F2B4D;background:rgba(43,58,103,.10)}

.card{
  background:var(--paper);border:var(--line);border-radius:var(--radius);
  padding:clamp(18px,2.2vw,28px);
  transition:box-shadow 160ms var(--ease),border-color 160ms var(--ease);
}
.card:hover{box-shadow:var(--shadow-soft);border-color:rgba(28,26,23,.42)}
.card--fill{background:var(--paper-2)}

/* ---------- 检索索引 ---------- */
.index-list{display:flex;flex-direction:column;border-top:var(--line)}
.index-item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;gap:14px;
  padding:14px 12px 14px 6px;
  border-bottom:var(--line);text-decoration:none;color:var(--ink);
  transition:background 160ms var(--ease),padding 160ms var(--ease);
}
.index-item:hover{background:linear-gradient(90deg,var(--accent-soft),transparent 74%)}
.index-item__no{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--ink-2)}
.index-item__title{display:block;font-size:16px;font-weight:800;line-height:1.5}
.index-item__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--ink-2);white-space:nowrap}
@media (max-width:639px){
  .index-item{grid-template-columns:auto minmax(0,1fr);row-gap:4px}
  .index-item__meta{grid-column:2}
}

/* ---------- 图片容器（页面阶段放置占位） ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;width:100%;
  border:var(--line);border-radius:var(--radius);
  background:var(--paper-2);
}
.media img,.media picture img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--4x5{aspect-ratio:4/5}
.media--1x1{aspect-ratio:1/1}
.media__label{
  position:absolute;left:10px;bottom:10px;
  background:var(--paper);border:var(--line);border-radius:1px;
  padding:3px 8px;font-family:var(--font-mono);font-size:10px;
  letter-spacing:.1em;color:var(--ink-2);
}
.media--spring{background-image:repeating-linear-gradient(118deg,rgba(110,156,88,.24) 0 2px,transparent 2px 14px),radial-gradient(circle at 24% 18%,rgba(228,195,192,.9),transparent 58%),linear-gradient(160deg,#F7F3EC,#E7E1D6)}
.media--summer{background-image:repeating-radial-gradient(circle at 72% 118%,rgba(47,127,166,.24) 0 1px,transparent 1px 15px),linear-gradient(200deg,#F7F3EC,#DCE7EC)}
.media--autumn{background-image:repeating-linear-gradient(74deg,rgba(196,98,45,.20) 0 1px,transparent 1px 11px),radial-gradient(circle at 80% 30%,rgba(217,169,76,.55),transparent 60%),linear-gradient(150deg,#F7F3EC,#EBDCC9)}
.media--winter{background-image:repeating-linear-gradient(45deg,rgba(43,58,103,.16) 0 1px,transparent 1px 12px),repeating-linear-gradient(-45deg,rgba(43,58,103,.10) 0 1px,transparent 1px 12px),linear-gradient(180deg,#F7F3EC,#E4E9EC)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;
  background:var(--winter);color:var(--frost);
  border-top:1px solid rgba(238,242,244,.3);
  padding-block:clamp(34px,4.6vw,62px) 26px;
}
.footer-inner{width:min(100% - 40px,1240px);margin-inline:auto}
.footer-top{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);
  gap:clamp(22px,4vw,56px);
  padding-bottom:clamp(22px,3.4vw,40px);
  border-bottom:1px solid rgba(238,242,244,.22);
}
.footer-brand__mark{font-size:clamp(19px,1.9vw,25px);font-weight:900;letter-spacing:-.01em;line-height:1.25;color:var(--frost)}
.footer-brand__line{margin-top:12px;max-width:24ch;font-size:14px;line-height:1.75;color:rgba(238,242,244,.78)}
.footer-brand__addr{margin-top:14px;max-width:26ch;font-size:13px;line-height:1.7;color:rgba(238,242,244,.62)}
.footer-brand__since{margin-top:10px;font-size:11px;letter-spacing:.1em;color:rgba(238,242,244,.55)}
.footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(14px,2vw,26px)}
.footer-col__title{
  margin-bottom:12px;font-family:var(--font-mono);
  font-size:11px;font-weight:500;letter-spacing:.18em;
  color:rgba(238,242,244,.6);
}
.footer-col__list{display:flex;flex-direction:column;gap:9px;font-size:14px}
.footer-col__list a{
  text-decoration:none;color:var(--frost);padding-bottom:1px;
  border-bottom:1px solid transparent;
  transition:border-color 160ms var(--ease),color 160ms var(--ease);
}
.footer-col__list a:hover{border-bottom-color:var(--autumn-soft);color:#FFFFFF}
.footer-contact{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:rgba(238,242,244,.86)}
.footer-contact .mono{overflow-wrap:anywhere;font-size:12px}
.copy-btn{
  display:inline-flex;align-items:center;
  border:1px solid rgba(238,242,244,.42);border-radius:var(--radius);
  background:transparent;color:var(--frost);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  padding:3px 8px;cursor:pointer;
  transition:background 160ms var(--ease),color 160ms var(--ease),border-color 160ms var(--ease);
}
.copy-btn:hover{background:var(--frost);color:var(--winter);border-color:var(--frost)}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 26px;
  padding-top:20px;font-size:12px;color:rgba(238,242,244,.7);
}
.footer-meta__row{max-width:none}
.footer-status{
  flex:1 1 auto;min-height:1em;max-width:none;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.03em;
  color:var(--summer-bright);
}
.footer-copy{margin-left:auto;font-size:11px;letter-spacing:.08em;color:rgba(238,242,244,.55);max-width:none}
.site-footer :focus-visible{outline-color:var(--frost)}

@media (max-width:899px){
  .footer-top{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 18px}
  .footer-copy{margin-left:0}
}
@media (max-width:719px){
  .search-slot__label{display:none}
  .quick-return{display:none}
  .site-nav__note{font-size:10px}
}
@media (max-width:519px){
  .brand__sub{display:none}
  .frame-bar__inner{gap:12px;padding:0 16px}
  .season-rail{padding:6px 16px}
  .wrap{width:min(100% - 32px,1240px)}
  .footer-inner{width:min(100% - 32px,1240px)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .read-progress__bar{transition:none}
}