@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@400;500;600;700&family=Comic+Neue:wght@300;400;700&display=swap');

:root{
  --ink:#1f1f1f;
  --ink-soft:#5c5c62;
  --paper:#f5f5f5;
  --card:#ffffff;
  --line:rgba(31,31,31,.09);
  --r:28px;
  --rail:88px;
  --shadow:0 4px 6px rgba(0,0,0,.05);
}

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

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Baloo 2','Comic Neue',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.75;
  overflow-x:hidden;
}

img{display:block;max-width:100%;height:auto}

a:focus-visible,
summary:focus-visible,
button:focus-visible{
  outline:3px solid var(--ink);
  outline-offset:2px;
  border-radius:12px;
}

.shell{min-height:100vh}

/* 左侧竖排导航 */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  z-index:60;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:14px 10px;
  background:var(--card);
  border-right:1px solid var(--line);
}

.mark{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  border-radius:16px;
  background:var(--ink);
  color:#fff;
  text-decoration:none;
  transition:transform .3s ease;
}
.mark:hover{transform:scale(1.06)}
.mark-img{width:34px;height:34px;border-radius:10px;object-fit:cover}
.mark-glyph{font-size:22px;font-weight:600;line-height:1}

.navbox{
  position:relative;
  width:100%;
  display:flex;
  justify-content:center;
}

.navbox summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:10px 8px;
  border-radius:14px;
  background:var(--paper);
  font-size:16px;
  font-weight:500;
  letter-spacing:.12em;
  color:var(--ink);
  writing-mode:vertical-rl;
  text-orientation:upright;
  transition:background .25s ease;
}
.navbox summary::-webkit-details-marker{display:none}
.navbox summary:hover{background:#ebebeb}
.navbox[open] summary{background:var(--ink);color:#fff}

.navbox menu{
  list-style:none;
  margin:0;
  padding:8px;
  position:absolute;
  left:calc(100% + 6px);
  top:0;
  width:214px;
  display:grid;
  gap:2px;
  background:var(--card);
  border-radius:20px;
  box-shadow:0 18px 42px rgba(0,0,0,.14);
}

.navbox menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 12px;
  border-radius:12px;
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  transition:background .22s ease,transform .22s ease;
}
.navbox menu a:hover{background:var(--paper);transform:translateX(3px)}

/* 主区：正文 + 右侧附加栏 */
main{
  margin-left:var(--rail);
  max-width:1260px;
  padding:24px 28px 12px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 296px;
  gap:18px;
  align-items:start;
}

section{
  display:grid;
  gap:18px;
  min-width:0;
}

.hero{
  position:relative;
  min-height:45vh;
  display:grid;
  grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);
  align-items:center;
  gap:18px;
  padding:clamp(22px,3.6vw,42px);
  border-radius:var(--r);
  background:var(--card);
  background-image:radial-gradient(rgba(31,31,31,.11) 1px,transparent 1px);
  background-size:16px 16px;
  box-shadow:var(--shadow);
  overflow:hidden;
}
.hero--solo{grid-template-columns:1fr}

.hero-copy{min-width:0}

.hero h1{
  margin:0;
  font-size:clamp(28px,4.4vw,46px);
  line-height:1.16;
  letter-spacing:-.02em;
  font-weight:700;
}

.hero-figure{
  margin:0;
  padding:14px;
  min-height:180px;
  border-radius:22px;
  background:var(--paper);
  display:flex;
  align-items:center;
  justify-content:center;
  will-change:transform;
}
.hero-img{
  width:100%;
  max-height:320px;
  object-fit:contain;
  border-radius:16px;
}

/* 正文卡片 */
section > article{
  background:var(--card);
  border-radius:var(--r);
  padding:clamp(20px,3.4vw,34px);
  box-shadow:var(--shadow);
  scroll-margin-top:96px;
  transition:transform .35s ease,box-shadow .35s ease;
}
section > article:nth-of-type(3n){background:#fbfbfb}
section > article:hover{
  transform:translateY(-2px);
  box-shadow:0 14px 28px rgba(0,0,0,.07);
}

section h2{
  margin:0 0 10px;
  font-size:clamp(21px,2.6vw,29px);
  line-height:1.3;
  letter-spacing:-.01em;
}
section h3{
  margin:24px 0 8px;
  font-size:19px;
  line-height:1.4;
}
section p{margin:0 0 14px;max-width:70ch}
section p:last-child{margin-bottom:0}
section ul,
section ol{margin:0 0 14px;padding-left:1.3em;max-width:70ch}
section li{margin:6px 0;line-height:1.7}
section a{
  color:var(--ink);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
section a:hover{background:#ececec;border-radius:6px}
section strong{font-weight:600}

/* 右侧附加栏 */
aside{
  position:sticky;
  top:24px;
  min-width:0;
  background:var(--card);
  border-radius:var(--r);
  padding:22px;
  box-shadow:var(--shadow);
}
aside h2{
  margin:0 0 8px;
  font-size:18px;
  line-height:1.4;
}
.subtitle{
  margin:0 0 16px;
  color:var(--ink-soft);
  font-size:16px;
  line-height:1.7;
}
aside menu{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
aside menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 12px;
  border-radius:12px;
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  transition:background .25s ease,transform .25s ease;
}
aside menu a:hover{background:var(--paper);transform:translateX(3px)}

/* 页脚 */
footer{
  margin-left:var(--rail);
  max-width:1260px;
  padding:18px 28px 34px;
  display:grid;
  gap:18px;
}

.foot-cta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:clamp(22px,3.4vw,36px);
  border-radius:var(--r);
  background:var(--ink);
  color:#fff;
}
.cta-word{
  margin:0;
  font-size:clamp(20px,3vw,30px);
  font-weight:600;
  letter-spacing:-.01em;
}
.cta-btn{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:10px 24px;
  border-radius:999px;
  background:#fff;
  color:var(--ink);
  text-decoration:none;
  font-weight:600;
  transition:transform .25s ease,background .25s ease;
}
.cta-btn:hover{transform:translateY(-2px);background:var(--paper)}

.foot-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px;
  padding:24px;
  border-radius:var(--r);
  background:var(--card);
  box-shadow:var(--shadow);
}
.foot-dl{margin:0;min-width:0}
.foot-dl dt{
  margin-bottom:8px;
  font-size:16px;
  font-weight:600;
}
.foot-dl dd{
  margin:0;
  color:var(--ink-soft);
  font-size:16px;
  line-height:1.6;
}
.foot-dl a{
  display:flex;
  align-items:center;
  min-height:40px;
  color:var(--ink-soft);
  text-decoration:none;
  font-size:16px;
}
.foot-dl a:hover{color:var(--ink)}

.foot-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-top:14px;
  border-top:1px solid var(--line);
  color:var(--ink-soft);
  font-size:16px;
}
.foot-base p{margin:0}
.base-links{display:flex;flex-wrap:wrap;gap:6px}
.base-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 12px;
  border-radius:10px;
  color:var(--ink-soft);
  text-decoration:none;
}
.base-links a:hover{background:#ececec;color:var(--ink)}

@media (max-width:1000px){
  main{grid-template-columns:minmax(0,1fr) 260px;padding:22px 20px 12px}
  footer{padding:16px 20px 28px}
}

@media (max-width:860px){
  :root{--rail:0px}

  .rail{
    inset:0 0 auto 0;
    width:100%;
    height:auto;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    padding:8px 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .navbox{width:auto;margin-left:auto}
  .navbox summary{
    writing-mode:horizontal-tb;
    padding:8px 18px;
    min-height:44px;
    letter-spacing:.06em;
    border-radius:999px;
  }
  .navbox menu{
    left:auto;
    right:0;
    top:calc(100% + 8px);
    width:min(262px,calc(100vw - 28px));
    box-shadow:0 20px 44px rgba(0,0,0,.18);
  }

  main{
    margin-left:0;
    padding:78px 14px 14px;
    grid-template-columns:minmax(0,1fr);
    gap:14px;
  }
  aside{position:static;order:2}

  .hero{grid-template-columns:1fr;min-height:0}
  .hero-figure{min-height:150px}

  footer{margin-left:0;padding:14px 14px 26px}
  .foot-grid{grid-template-columns:1fr;gap:4px;padding:18px}
  .foot-dl{padding-bottom:10px;border-bottom:1px solid var(--line)}
  .foot-dl:last-child{padding-bottom:0;border-bottom:0}
}

@media (max-width:420px){
  body{font-size:16px}
  .hero h1{font-size:clamp(26px,7.6vw,34px)}
  .foot-cta{padding:20px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{
    animation-duration:.001ms!important;
    transition-duration:.001ms!important;
  }
  .hero-figure{transform:none!important}
  section > article:hover{transform:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}