@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,600;0,700;0,800;1,400&display=swap');

:root{
  --blue:#3bb1ff;
  --red:#ff5252;
  --ink:#000000;
  --paper:#ffffff;
  --sand:#f2eee4;
  --line:4px solid var(--ink);
  --shadow:6px 6px 0 var(--ink);
  --radius:28px;
}

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

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

body{
  margin:0;
  font-family:'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size:17px;
  line-height:1.65;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(rgba(0,0,0,.14) 1.6px, transparent 1.6px);
  background-size:24px 24px;
  overflow-x:clip;
}

img{ max-width:100%; height:auto; display:block }
a{ color:inherit }
p{ margin:0 0 16px }
ul,ol{ margin:0 0 16px; padding-left:22px }
li{ margin-bottom:6px }

:focus-visible{
  outline:3px dashed var(--ink);
  outline-offset:3px;
}

section[id]{ scroll-margin-top:104px }

/* ---------- 左侧固定竖排导航 ---------- */

body{ padding-left:0 }

.rail{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  flex-direction:row;
  align-items:center;
  gap:10px;
  padding:8px 10px;
  background:var(--paper);
  border-bottom:var(--line);
  overflow-x:auto;
}

.rail-top{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
}

.mark{
  display:grid;
  place-items:center;
  width:44px;
  height:44px;
  flex:0 0 auto;
  font-weight:800;
  font-size:20px;
  line-height:1;
  text-decoration:none;
  color:var(--ink);
  background:var(--blue);
  border:3px solid var(--ink);
  border-radius:13px;
  box-shadow:4px 4px 0 var(--ink);
  overflow:hidden;
}
.mark img{ width:100%; height:100%; object-fit:cover }
.mark:hover{ transform:translate(-1px,-1px); box-shadow:5px 5px 0 var(--ink) }

.rail-tag{
  display:none;
  font-size:15px;
  font-weight:800;
  letter-spacing:.08em;
  white-space:nowrap;
}

.rail-nav{ flex:1 1 auto; min-width:0; overflow-x:auto }
.rail-nav ul{
  display:flex;
  flex-direction:row;
  gap:6px;
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:railn;
}
.rail-nav li{ counter-increment:railn; margin:0 }
.rail-nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 12px;
  white-space:nowrap;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  border:3px solid transparent;
  border-radius:12px;
}
.rail-nav a::before{
  content:counter(railn,decimal-leading-zero);
  margin-right:7px;
  font-size:13px;
  font-weight:800;
  opacity:.5;
}
.rail-nav a:hover,
.rail-nav a:focus-visible{
  background:var(--blue);
  border-color:var(--ink);
  box-shadow:4px 4px 0 var(--ink);
}

.rail-cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 14px;
  font-size:15px;
  font-weight:800;
  text-decoration:none;
  white-space:nowrap;
  color:#fff;
  background:var(--red);
  border:3px solid var(--ink);
  border-radius:13px;
  box-shadow:4px 4px 0 var(--ink);
}
.rail-cta:hover{ transform:translate(-1px,-1px); box-shadow:6px 6px 0 var(--ink) }

/* ---------- 主体 ---------- */

main{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

div{ min-width:0 }

.hero{
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
  align-content:center;
  padding:32px 0 40px;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 16px;
  padding:6px 14px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.04em;
  color:#fff;
  background:var(--ink);
  border-radius:999px;
}
.eyebrow .dot{
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--red);
}

h1{
  margin:0 0 18px;
  font-size:clamp(2rem, 6vw, 3.4rem);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.02em;
}

.lede{
  max-width:46ch;
  font-size:18px;
  line-height:1.6;
  color:#1c1c1c;
}

.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:12px 22px;
  font-size:16px;
  font-weight:800;
  text-decoration:none;
  color:var(--ink);
  background:#fff;
  border:3px solid var(--ink);
  border-radius:14px;
  box-shadow:5px 5px 0 var(--ink);
}
.btn:hover{ transform:translate(-2px,-2px); box-shadow:7px 7px 0 var(--ink) }
.btn-main{ background:var(--blue) }
.btn-ink{ background:var(--ink); color:#fff }

.hero-media{
  position:relative;
  overflow:hidden;
  aspect-ratio:4/3;
  border:var(--line);
  border-radius:36px;
  background:var(--blue);
  box-shadow:10px 10px 0 var(--ink);
}
.hero-media img{ width:100%; height:100%; object-fit:cover }

.hero-plate{
  display:grid;
  place-content:center;
  gap:6px;
  text-align:center;
}
.hero-plate strong{
  font-size:clamp(1.8rem, 7vw, 2.8rem);
  font-weight:800;
  letter-spacing:-.02em;
}
.hero-plate span{
  font-size:15px;
  font-weight:700;
  letter-spacing:.16em;
}

/* ---------- 引导块 ---------- */

.lead-in{
  padding:26px 26px 12px;
  margin-bottom:12px;
  background:var(--sand);
  border-radius:var(--radius);
}
.lead-in h2{
  margin:0 0 12px;
  font-size:clamp(1.4rem, 4vw, 1.9rem);
  font-weight:800;
  line-height:1.25;
}
.lead-in p{ margin-bottom:10px }

.kicker{
  display:inline-block;
  margin-bottom:10px;
  padding:5px 12px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.1em;
  color:#fff;
  background:var(--red);
  border-radius:9px;
  box-shadow:3px 3px 0 var(--ink);
}
.kicker-dark{ background:var(--ink) }
.kicker + h2,
.kicker + h3{ margin-top:0 }

/* ---------- 正文 ---------- */

.content{ padding:6px 0 36px }

.content section{
  padding:30px 0 18px;
  border-top:var(--line);
}
.content section:first-child{ border-top:0; padding-top:8px }

.content h2{
  font-size:clamp(1.5rem, 3.4vw, 2.05rem);
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
  margin:0 0 14px;
}
.content h3{
  font-size:1.2rem;
  font-weight:800;
  margin:24px 0 10px;
}
.content small{
  display:inline-block;
  margin-bottom:8px;
  padding:4px 11px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.08em;
  background:var(--blue);
  border-radius:8px;
  box-shadow:3px 3px 0 var(--ink);
}

.content a{
  font-weight:700;
  text-decoration:underline;
  text-decoration-thickness:3px;
  text-underline-offset:3px;
}

.content strong{ background:rgba(59,177,255,.4); padding:0 3px }

.content ul,
.content ol{ padding-left:24px }
.content li{ margin-bottom:9px }

.content blockquote{
  margin:18px 0;
  padding:16px 20px;
  background:var(--sand);
  border-left:8px solid var(--ink);
  border-radius:18px;
}
.content blockquote p:last-child{ margin-bottom:0 }

.content table{
  display:block;
  width:100%;
  overflow-x:auto;
  margin:18px 0;
  border-collapse:collapse;
  font-size:16px;
}
.content th,
.content td{
  border:3px solid var(--ink);
  padding:9px 12px;
  text-align:left;
  vertical-align:top;
}
.content th{ background:var(--blue) }

.content img{
  margin:18px 0;
  border:var(--line);
  border-radius:22px;
  box-shadow:var(--shadow);
}

.content hr{
  height:0;
  margin:30px 0;
  border:0;
  border-top:var(--line);
}

/* ---------- 右侧边栏 ---------- */

.side{
  display:flex;
  flex-direction:column;
  gap:20px;
  padding:8px 0 36px;
}

.side-card{
  padding:22px;
  background:var(--blue);
  border-radius:var(--radius);
  box-shadow:8px 8px 0 var(--ink);
}
.side-card-red{ background:var(--red); color:#fff }
.side-card-red .kicker{ background:#fff; color:var(--ink) }
.side-card-red .btn{ box-shadow:4px 4px 0 #000 }
.side-card p{ margin-bottom:14px; font-size:16px }

.side-title{
  margin:0 0 12px;
  font-size:19px;
  font-weight:800;
  line-height:1.3;
}

.side-list{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.side-list li{ margin:0 }
.side-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 12px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  background:#fff;
  border:3px solid var(--ink);
  border-radius:13px;
  box-shadow:3px 3px 0 var(--ink);
}
.side-list a:hover{ transform:translate(-1px,-1px); box-shadow:5px 5px 0 var(--ink) }

/* ---------- 页脚 ---------- */

footer{
  margin-top:10px;
  border-top:var(--line);
  background:var(--paper);
}

.foot-top{
  display:grid;
  gap:24px;
  max-width:1180px;
  margin:0 auto;
  padding:38px 20px;
  border-bottom:var(--line);
}
.foot-top h2{
  margin:0 0 10px;
  font-size:clamp(1.35rem, 3.6vw, 1.75rem);
  font-weight:800;
  line-height:1.25;
}
.foot-top p{ margin:0; font-size:16px; max-width:44ch }

.foot-form label{
  display:block;
  margin-bottom:8px;
  font-size:16px;
  font-weight:800;
}
.foot-form .field{ display:flex; flex-wrap:wrap; gap:10px }
.foot-form input{
  flex:1 1 190px;
  min-height:48px;
  padding:0 14px;
  font-family:inherit;
  font-size:16px;
  color:var(--ink);
  background:#fff;
  border:3px solid var(--ink);
  border-radius:13px;
  box-shadow:4px 4px 0 var(--ink);
}
.foot-form button{
  flex:0 0 auto;
  min-height:48px;
  padding:0 22px;
  font-family:inherit;
  font-size:16px;
  font-weight:800;
  color:#fff;
  background:var(--red);
  border:3px solid var(--ink);
  border-radius:13px;
  box-shadow:4px 4px 0 var(--ink);
  cursor:pointer;
}
.foot-form button:hover{ transform:translate(-1px,-1px); box-shadow:6px 6px 0 var(--ink) }

.foot-bar{
  display:grid;
  gap:14px;
  max-width:1180px;
  margin:0 auto;
  padding:24px 20px 40px;
  align-items:center;
}

.foot-brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  font-size:16px;
}
.mark-sm{ width:40px; height:40px; font-size:18px; border-radius:11px }

.foot-nav ul{
  display:flex;
  flex-wrap:wrap;
  gap:4px 14px;
  margin:0;
  padding:0;
  list-style:none;
}
.foot-nav li{ margin:0 }
.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  border-bottom:3px solid transparent;
}
.foot-nav a:hover{ border-bottom-color:var(--red) }

.foot-copy{ font-size:16px; font-weight:600 }

/* ---------- 滚动显现 ---------- */

.rev-ready .rev{ opacity:0; transform:translateY(16px) }
.rev-ready .rev.in{
  opacity:1;
  transform:none;
  transition:opacity .5s ease, transform .5s ease;
}

/* ---------- 断点 ---------- */

@media (min-width:900px){
  .foot-top{ grid-template-columns:1.15fr .85fr; align-items:center }
  .foot-bar{ grid-template-columns:auto 1fr auto; gap:24px }
}

@media (min-width:1024px){
  body{ padding-left:252px }

  .rail{
    position:fixed;
    inset:0 auto 0 0;
    width:252px;
    flex-direction:column;
    align-items:stretch;
    gap:18px;
    padding:22px 18px;
    border-bottom:0;
    border-right:var(--line);
    overflow-x:hidden;
    overflow-y:auto;
  }
  .rail-top{ gap:10px }
  .rail-tag{ display:block }
  .rail-nav{ overflow:visible }
  .rail-nav ul{ flex-direction:column; gap:8px }
  .rail-nav a{ white-space:normal }
  .rail-cta{
    margin-top:auto;
    justify-content:center;
    padding:14px 12px;
    font-size:16px;
    min-height:52px;
  }

  .hero{
    grid-template-columns:1.02fr .98fr;
    align-items:center;
    gap:38px;
    min-height:100svh;
    padding:36px 0 48px;
  }
  .hero-copy{ text-align:center }
  .lede{ margin-inline:auto }
  .hero-actions{ justify-content:center }

  main{
    display:grid;
    grid-template-columns:minmax(0,1fr) 302px;
    gap:44px;
    align-items:start;
  }
  .side{ position:sticky; top:26px; padding-top:36px }

  section[id]{ scroll-margin-top:26px }
}

@media (min-width:1180px){
  .content section{ padding-top:36px }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto }
  .rev-ready .rev{ opacity:1; transform:none }
  .btn:hover,
  .mark:hover,
  .rail-cta:hover,
  .side-list a:hover,
  .foot-form button:hover{ transform:none }
}

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