/* ===== 仲博CN 共享站点样式 /assets/site.css ===== */

*,
*::before,
*::after{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}

body,h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dd,figure,blockquote,address,fieldset{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,picture,video{max-width:100%;}
button{font:inherit;color:inherit;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
summary{display:list-item;}

:root{
  --ink:#0B1B2B;
  --ink-deep:#08131F;
  --ink-2:#102A43;
  --paper:#F3E9D2;
  --paper-2:#E7D9BC;
  --brown:#2C1B14;
  --cyan:#35E0D0;
  --cyan-soft:#6FF7EA;
  --amber:#FF8A3D;
  --rust:#D9532B;
  --mist:#9FB3C8;
  --line:rgba(53,224,208,.20);
  --line-soft:rgba(159,179,200,.18);
  --line-paper:rgba(44,27,20,.18);
  --shadow-card:0 1px 0 rgba(255,255,255,.04),0 18px 36px -28px rgba(0,0,0,.9);
  --wrap:1240px;
  --gutter:clamp(18px,4vw,40px);
  --radius:3px;
  --header-h:70px;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Sarasa Mono SC","Noto Sans Mono CJK SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Sarasa Mono SC","Noto Sans Mono CJK SC",monospace;
}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  background-color:var(--ink);
  color:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-wrap:break-word;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.02em;
}

::selection{background:var(--cyan);color:#04202a;}

:focus-visible{outline:2px solid var(--cyan-soft);outline-offset:3px;}

[id]{scroll-margin-top:calc(var(--header-h) + 22px);}

.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;
}

/* ---------- 布局容器 ---------- */
.container{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:860px;}
.page-main{display:block;min-height:52vh;}

.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--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}
.grid--split{grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);}

.rule{height:1px;border:0;background:var(--line-soft);margin:0;}
.band{background:var(--ink-2);border-block:1px solid var(--line-soft);}

/* ---------- 排版与索引组件 ---------- */
.eyebrow{
  display:flex;align-items:center;gap:.65em;
  font-family:var(--font-mono);font-size:.72rem;font-weight:400;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.75;}

.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px 24px;padding-bottom:14px;margin-bottom:clamp(20px,3vw,34px);
  border-bottom:1px solid var(--line-soft);
}
.section-title{
  font-size:clamp(1.45rem,3vw,2.1rem);
  color:var(--paper);
}

.lede{
  max-width:46ch;
  font-size:clamp(1rem,1.5vw,1.1rem);
  line-height:1.8;
  color:var(--mist);
}

.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.28em .6em;border:1px solid var(--line);border-radius:2px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;
  color:var(--cyan-soft);white-space:nowrap;
}
.tag--amber{color:var(--amber);border-color:rgba(255,138,61,.42);}
.tag--rust{color:#fff;background:var(--rust);border-color:var(--rust);}
.tag--paper{color:var(--brown);border-color:var(--line-paper);background:var(--paper);}

.breadcrumb{padding-block:18px 0;}
.breadcrumb ol{
  display:flex;flex-wrap:wrap;gap:.45em;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center;}
.breadcrumb li+li::before{content:"/";margin-right:.5em;color:rgba(159,179,200,.45);}
.breadcrumb a{transition:color .18s ease;}
.breadcrumb a:hover{color:var(--cyan);}

/* ---------- 正文 / 纸张区 ---------- */
.prose{max-width:38em;line-height:1.85;}
.prose>*+*{margin-top:1.05em;}
.prose h2{font-size:clamp(1.15rem,2vw,1.4rem);margin-top:1.9em;}
.prose h3{font-size:1.02rem;margin-top:1.6em;}
.prose ul,.prose ol{padding-left:1.25em;list-style:disc;}
.prose ol{list-style:decimal;}
.prose li+li{margin-top:.4em;}
.prose strong{font-weight:700;}

.sheet{
  background-color:var(--paper);
  color:var(--brown);
  border:1px solid var(--line-paper);
  border-radius:var(--radius);
  padding:clamp(20px,3.2vw,40px);
}
.sheet .prose{color:var(--brown);}
.sheet a{color:var(--rust);text-decoration:underline;text-underline-offset:.18em;text-decoration-thickness:1px;}
.sheet .prose h2,.sheet .prose h3{color:var(--brown);}
.sheet .rule{background:var(--line-paper);}

.notice{
  padding:14px 16px;
  border-left:2px solid var(--amber);
  border-radius:0 var(--radius) var(--radius) 0;
  background-color:rgba(255,138,61,.09);
  font-size:.9rem;line-height:1.7;color:var(--paper);
}
.sheet .notice{color:var(--brown);background-color:rgba(217,83,43,.10);}

/* ---------- 按钮 ---------- */
.btn-row{display:flex;flex-wrap:wrap;gap:12px;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.72em 1.15em;
  border:1px solid var(--line-soft);border-radius:2px;
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.07em;
  color:var(--paper);background-color:transparent;cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{background-color:var(--cyan);border-color:var(--cyan);color:#04202a;font-weight:700;}
.btn--primary:hover{background-color:var(--cyan-soft);border-color:var(--cyan-soft);}
.btn--ghost{color:var(--cyan);border-color:rgba(53,224,208,.48);}
.btn--ghost:hover{background-color:rgba(53,224,208,.14);border-color:var(--cyan);}
.btn--amber{color:var(--amber);border-color:rgba(255,138,61,.5);}
.btn--amber:hover{background-color:var(--amber);color:#1c0f07;border-color:var(--amber);}

/* ---------- 卡片 / 折叠路径卡 ---------- */
.card{
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background-color:rgba(16,42,67,.55);
  box-shadow:var(--shadow-card);
}

.disclosure{
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background-color:rgba(16,42,67,.55);
  overflow:hidden;
}
.disclosure+.disclosure{margin-top:10px;}
.disclosure__summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 18px;cursor:pointer;list-style:none;
  font-family:var(--font-display);font-weight:700;font-size:.98rem;color:var(--paper);
  transition:background-color .18s ease,color .18s ease;
}
.disclosure__summary::-webkit-details-marker{display:none;}
.disclosure__summary:hover{background-color:rgba(53,224,208,.08);color:var(--cyan-soft);}
.disclosure__icon{
  flex:none;display:inline-block;
  font-family:var(--font-mono);font-size:1rem;line-height:1;
  color:var(--cyan);transition:transform .22s ease;
}
.disclosure[open] .disclosure__icon{transform:rotate(45deg);}
.disclosure__body{
  padding:4px 18px 18px;
  border-top:1px solid var(--line-soft);
  color:var(--mist);font-size:.92rem;line-height:1.8;
}
.disclosure__body>*+*{margin-top:.8em;}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;width:100%;
  aspect-ratio:16/10;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background-color:var(--ink-2);
}
.media-frame::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:
    linear-gradient(rgba(53,224,208,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(53,224,208,.10) 1px,transparent 1px);
  background-size:34px 34px;
  opacity:.75;
}
.media-frame img,
.media-frame svg,
.media-frame picture{
  position:relative;z-index:1;
  display:block;width:100%;height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:4/5;}
.sheet .media-frame{border-color:var(--line-paper);}

/* ---------- 滚动状态（由 JS 驱动） ---------- */
.js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .34s ease,transform .34s ease;
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

[data-spy]{
  position:relative;
  transition:color .2s ease,border-color .2s ease;
}
[data-spy].is-active{color:var(--cyan);}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:200;
  padding:10px 16px;border-radius:2px;
  background-color:var(--cyan);color:#04202a;
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;
  transition:top .16s ease;
}
.skip-link:focus{top:12px;}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background-color:rgba(11,27,43,.95);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.site-header__inner{
  position:relative;
  display:flex;align-items:center;gap:clamp(12px,1.8vw,22px);
  width:100%;max-width:var(--wrap);margin-inline:auto;
  min-height:var(--header-h);
  padding-inline:var(--gutter);
}

.brand{
  display:inline-flex;align-items:baseline;gap:8px;
  flex:none;
  font-family:var(--font-display);font-weight:900;
  font-size:1.06rem;letter-spacing:-.01em;color:var(--paper);
  white-space:nowrap;
}
.brand::before{
  content:"";align-self:center;
  width:9px;height:9px;border-radius:50%;
  border:2px solid var(--cyan);
  box-shadow:0 0 0 3px rgba(53,224,208,.14);
}
.brand__mark{display:inline-block;}
.brand__sub{
  font-family:var(--font-mono);font-weight:400;
  font-size:.66rem;letter-spacing:.16em;color:var(--mist);
}

.site-header__utility{
  display:none;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
  color:var(--mist);
  padding-inline-start:14px;
  border-inline-start:1px solid var(--line-soft);
}

.site-nav{margin-inline-start:auto;}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,24px);}
.site-nav__link{
  position:relative;display:inline-block;
  padding:6px 2px;
  font-family:var(--font-mono);font-size:.82rem;letter-spacing:.05em;
  color:var(--mist);
  transition:color .18s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background-color:var(--cyan);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .22s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible{color:var(--cyan);}
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:var(--cyan-soft);}
.site-nav__link[aria-current="page"]::after{
  transform:scaleX(1);background-color:var(--cyan-soft);
}

.header-cta{
  flex:none;
  display:inline-flex;align-items:center;justify-content:center;
  padding:.5em .85em;
  border:1px solid rgba(53,224,208,.45);border-radius:2px;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.07em;
  color:var(--cyan);white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.header-cta:hover,
.header-cta:focus-visible{
  background-color:var(--cyan);color:#04202a;border-color:var(--cyan);
}

.nav-toggle{
  display:none;flex:none;
  width:40px;height:38px;padding:0;
  align-items:center;justify-content:center;
  background-color:transparent;
  border:1px solid var(--line-soft);border-radius:2px;
  cursor:pointer;
  transition:border-color .18s ease,background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan);background-color:rgba(53,224,208,.08);}
.nav-toggle__bars{display:block;position:relative;width:18px;height:12px;}
.nav-toggle__bars span{
  position:absolute;left:0;right:0;height:1.5px;
  background-color:var(--cyan);
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle__bars span:nth-child(1){top:0;}
.nav-toggle__bars span:nth-child(2){top:5.25px;}
.nav-toggle__bars span:nth-child(3){top:10.5px;}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5.25px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.25px) rotate(-45deg);}

.read-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background-color:rgba(159,179,200,.14);
  overflow:hidden;pointer-events:none;
}
.read-progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(var(--progress,0));transform-origin:left center;
  background-image:linear-gradient(90deg,var(--cyan) 0%,var(--cyan-soft) 60%,var(--amber) 100%);
  transition:transform .1s linear;
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(40px,6vw,80px);
  padding-top:clamp(34px,5vw,60px);
  background-color:var(--ink-2);
  color:var(--mist);
  border-top:1px solid var(--line);
}
.site-footer__inner{
  display:grid;
  grid-template-columns:minmax(0,.9fr) minmax(0,1.45fr);
  gap:clamp(26px,4vw,56px);
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
  padding-bottom:clamp(26px,4vw,46px);
}
.site-footer__lead{
  display:flex;flex-direction:column;align-items:flex-start;
}
.footer-mark{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(1.15rem,2.4vw,1.55rem);
  letter-spacing:-.01em;color:var(--paper);
}
.footer-line{
  margin-top:10px;max-width:30ch;
  font-size:.9rem;line-height:1.75;color:var(--mist);
}
.footer-cta{
  display:inline-flex;align-items:center;
  margin-top:20px;padding:.6em 1em;
  border:1px solid rgba(255,138,61,.5);border-radius:2px;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.07em;
  color:var(--amber);
  transition:background-color .18s ease,color .18s ease;
}
.footer-cta:hover,
.footer-cta:focus-visible{background-color:var(--amber);color:#1c0f07;}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col{min-width:0;}
.footer-col__title{
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan);
}
.footer-list li+li{margin-top:9px;}
.footer-list a{
  display:inline-block;
  font-family:var(--font-mono);font-size:.82rem;letter-spacing:.02em;
  color:var(--mist);
  transition:color .18s ease;
}
.footer-list a:hover,
.footer-list a:focus-visible{color:var(--cyan);text-decoration:underline;text-underline-offset:.2em;}

.footer-address{
  display:grid;gap:7px;
  font-style:normal;
  font-family:var(--font-mono);font-size:.79rem;line-height:1.65;
  color:var(--mist);
}
.footer-address__note{
  margin-top:4px;padding-left:10px;
  border-left:2px solid rgba(255,138,61,.55);
  font-size:.74rem;color:rgba(159,179,200,.8);
}
.site-footer__meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 24px;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:16px var(--gutter) 28px;
  border-top:1px solid rgba(159,179,200,.14);
  font-family:var(--font-mono);font-size:.73rem;letter-spacing:.06em;
  color:rgba(159,179,200,.82);
}

/* ---------- 响应式 ---------- */
@media (min-width:1100px){
  .site-header__utility{display:block;}
}

@media (max-width:900px){
  :root{--header-h:64px;}

  .site-header__utility{display:none;}
  .brand{font-size:1rem;}
  .brand__sub{display:none;}

  .nav-toggle{display:inline-flex;}
  .header-cta{font-size:.7rem;padding:.45em .7em;}

  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    margin-inline-start:0;
    padding:8px var(--gutter) 20px;
    background-color:var(--ink-2);
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 42px -30px #000;
    opacity:0;visibility:hidden;transform:translateY(-6px);
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    transition:opacity .2s ease,transform .2s ease,visibility .2s;
  }
  .site-header[data-open] .site-nav{
    opacity:1;visibility:visible;transform:translateY(0);
  }
  .site-nav__list{display:block;}
  .site-nav__list li+li{border-top:1px solid rgba(159,179,200,.12);}
  .site-nav__link{
    display:block;width:100%;
    padding:14px 2px;
    font-size:.95rem;
  }
  .site-nav__link::after{display:none;}
  .site-nav__link[aria-current="page"]{
    color:var(--cyan-soft);padding-left:16px;
  }
  .site-nav__link[aria-current="page"]::before{
    content:"";position:absolute;left:0;top:50%;
    width:6px;height:6px;border-radius:50%;background-color:var(--cyan);
    transform:translateY(-50%);
  }

  .site-footer__inner{grid-template-columns:minmax(0,1fr);}
  .grid--2,.grid--3,.grid--split{grid-template-columns:minmax(0,1fr);}
}

@media (max-width:700px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-col--contact{grid-column:1 / -1;}
  .site-footer__meta{flex-direction:column;align-items:flex-start;gap:6px;}
}

@media (max-width:420px){
  .header-cta{padding:.42em .6em;font-size:.66rem;letter-spacing:.04em;}
  .brand{font-size:.94rem;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none;}
  .read-progress__bar{transition:none;}
}

@media print{
  .site-header,.site-footer,.skip-link,.read-progress,.nav-toggle{display:none !important;}
  body{background:#fff;color:#111;}
  .sheet{border-color:#999;background:#fff;}
  .card,.disclosure{border-color:#bbb;box-shadow:none;background:#fff;color:#111;}
  .lede,.footer-line{color:#333;}
}