@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;700&display=swap');

:root{
  --ink:#1B1B2F;
  --flame:#FF5A3C;
  --paper:#F5F1E8;
  --muted:#585870;
  --dim:#8f8fa4;
  --dock-h:112px;
}

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

html{
  scroll-behavior:smooth;
  scroll-padding-bottom:calc(var(--dock-h) + 16px);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"DM Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:17px;
  line-height:1.72;
  padding-bottom:var(--dock-h);
  -webkit-font-smoothing:antialiased;
}

img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3{margin:0;font-weight:700;line-height:1.16;letter-spacing:-.02em}
p{margin:0}
ul,ol{margin:0}

/* ---------- 首屏 ---------- */

.hero{
  display:grid;
  grid-template-columns:1fr 45%;
  min-height:calc(100svh - var(--dock-h));
  border-bottom:3px solid var(--ink);
}

.hero-copy{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:24px;
  padding:96px 6vw 72px 7vw;
}

.hero-copy h1{
  font-size:clamp(2.1rem,5.2vw,3.7rem);
  letter-spacing:-.035em;
  max-width:16ch;
}

.hero-lead{
  font-size:1.06rem;
  line-height:1.7;
  color:var(--muted);
  max-width:36ch;
}

.cta-btn{
  align-self:flex-start;
  display:inline-flex;
  align-items:center;
  gap:12px;
  min-height:50px;
  padding:0 28px;
  background:var(--ink);
  color:var(--paper);
  font-weight:700;
  text-decoration:none;
  border:2px solid var(--ink);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.cta-btn::after{content:"→";font-weight:700}
.cta-btn:hover{background:var(--flame);border-color:var(--flame);color:var(--ink)}

.hero-art{
  margin:0;
  position:relative;
  overflow:hidden;
  background:var(--flame);
  border-left:3px solid var(--ink);
}
.hero-art img{
  width:100%;
  height:114%;
  object-fit:cover;
  will-change:transform;
}

/* ---------- 正文 ---------- */

.page-body{
  max-width:1180px;
  margin:0 auto;
  padding:52px 24px 96px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 252px;
  gap:0 52px;
  align-items:start;
}

.band{
  grid-column:1 / -1;
  margin:0 0 44px;
  min-height:170px;
  aspect-ratio:21 / 7;
  border:3px solid var(--ink);
  background:var(--ink);
  overflow:hidden;
}
.band img{width:100%;height:100%;object-fit:cover}

.prose{min-width:0;max-width:74ch}

.prose section{
  scroll-margin-top:20px;
  scroll-margin-bottom:calc(var(--dock-h) + 20px);
}
.prose section + section{margin-top:6px}

.prose h2{
  font-size:1.55rem;
  margin:42px 0 14px;
  padding-top:20px;
  border-top:2px solid var(--ink);
}
.prose section:first-child h2:first-child,
.prose h2:first-child{margin-top:0;padding-top:0;border-top:0}

.prose h3{font-size:1.16rem;margin:30px 0 10px}

.prose p{margin:0 0 1.05em}
.prose p.subtitle{
  font-size:1.02rem;
  color:var(--muted);
  margin:-4px 0 1.2em;
}

.prose a{
  color:var(--flame);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.prose a:hover{background:var(--flame);color:var(--paper);text-decoration:none}

.prose ul,.prose ol{padding-left:1.35em;margin:0 0 1.1em}
.prose li{margin:0 0 .45em}
.prose li::marker{color:var(--flame);font-weight:700}

.prose img{
  margin:22px 0;
  border:2px solid var(--ink);
  width:100%;
}

.prose figure{margin:22px 0;border:2px solid var(--ink)}
.prose figcaption{font-size:.9rem;padding:8px 12px;background:var(--ink);color:var(--paper)}

.prose blockquote{
  margin:22px 0;
  padding:14px 20px;
  border-left:6px solid var(--flame);
  background:#efe9dc;
}
.prose blockquote p:last-child{margin-bottom:0}

.prose strong{font-weight:700}

.prose table{
  width:100%;
  border-collapse:collapse;
  margin:20px 0;
  font-size:.96rem;
}
.prose th,.prose td{border:2px solid var(--ink);padding:9px 12px;text-align:left}
.prose th{background:var(--ink);color:var(--paper)}

/* ---------- 侧栏 ---------- */

.rail{
  position:sticky;
  top:28px;
  border-top:3px solid var(--ink);
  padding-top:14px;
}
.rail-title{
  font-size:.86rem;
  font-weight:700;
  letter-spacing:.16em;
  margin:0 0 10px;
}
.rail-list{list-style:none;padding:0;display:grid;gap:0}
.rail-list a{
  display:flex;
  align-items:center;
  min-height:46px;
  padding:0 10px;
  text-decoration:none;
  font-weight:500;
  border-bottom:1px solid rgba(27,27,47,.18);
  transition:background .15s ease,color .15s ease;
}
.rail-list a:hover{background:var(--flame);color:var(--paper)}

/* ---------- 底部固定条 / 页脚 ---------- */

.dock{
  position:fixed;
  inset:auto 0 0 0;
  z-index:60;
  background:var(--ink);
  color:var(--paper);
  border-top:3px solid var(--flame);
  padding:8px 22px 10px;
  display:grid;
  grid-template-columns:auto 1fr auto;
  grid-template-areas:"brand nav cta";
  align-items:center;
  gap:2px 22px;
}

.dock-brand{grid-area:brand}
.brand-link{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:1.32rem;
  font-weight:700;
  letter-spacing:-.03em;
  text-decoration:none;
  color:var(--paper);
  transition:color .15s ease;
}
.brand-link:hover{color:var(--flame)}
.dock-desc{
  font-size:.75rem;
  line-height:1.45;
  color:#b9b9c8;
  max-width:38ch;
}
.copyright{font-size:.72rem;color:var(--dim)}

.dock-nav{grid-area:nav;min-width:0}
.dock-nav dl{
  position:relative;
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:0 2px;
  margin:0;
}
.dock-nav dt{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 8px;
  font-size:.7rem;
  letter-spacing:.2em;
  color:var(--dim);
}
.dock-nav dd{margin:0}
.dock-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 11px;
  font-size:1rem;
  font-weight:500;
  text-decoration:none;
  transition:background .15s ease,color .15s ease;
}
.dock-nav a:hover,.dock-nav a:focus-visible{background:var(--flame);color:var(--ink)}

.dock-cta{grid-area:cta}
.dock-cta a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 18px;
  background:var(--flame);
  color:var(--ink);
  font-weight:700;
  text-decoration:none;
  border:2px solid var(--flame);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.dock-cta a:hover{background:var(--paper);border-color:var(--paper);color:var(--ink)}

/* ---------- 动效 ---------- */

.anim [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease,transform .5s ease;
}
.anim [data-reveal].in{opacity:1;transform:none}

/* ---------- 平板 ---------- */

@media (max-width:1080px){
  .page-body{grid-template-columns:minmax(0,1fr) 220px;gap:0 34px}
  .hero-copy{padding:80px 5vw 64px 5vw}
}

/* ---------- 移动端 ---------- */

@media (max-width:860px){
  :root{--dock-h:200px}

  .hero{
    grid-template-columns:1fr;
    min-height:82svh;
  }
  .hero-copy{
    padding:52px 20px 34px;
    gap:18px;
  }
  .hero-copy h1{max-width:none;font-size:clamp(1.9rem,8vw,2.5rem)}
  .hero-lead{max-width:none;font-size:1rem}
  .cta-btn{width:100%;justify-content:center;min-height:52px}
  .hero-art{
    min-height:210px;
    border-left:0;
    border-top:3px solid var(--ink);
  }
  .hero-art img{height:116%}

  .page-body{
    grid-template-columns:1fr;
    gap:0;
    padding:36px 20px 72px;
  }
  .band{margin-bottom:30px;min-height:140px;aspect-ratio:16 / 8}
  .prose{max-width:none}
  .prose h2{font-size:1.32rem;margin-top:34px}

  .rail{
    position:static;
    margin-top:44px;
    top:auto;
  }
  .rail-list{grid-template-columns:1fr 1fr;gap:0 8px}

  .dock{
    grid-template-columns:1fr auto;
    grid-template-areas:"brand cta" "nav nav";
    padding:6px 14px 10px;
    gap:0 10px;
  }
  .brand-link{font-size:1.1rem;min-height:40px}
  .dock-desc{display:none}
  .copyright{font-size:.68rem}
  .dock-cta a{min-height:40px;padding:0 14px;font-size:.95rem}
  .dock-nav dl{gap:0 2px}
  .dock-nav dt{padding:0 6px;font-size:.64rem;min-height:40px}
  .dock-nav dd{display:inline-flex;position:static;background:none;border:0;padding:0}
  .dock-nav a{padding:0 9px;min-height:40px;font-size:1rem}
}

@media (max-width:380px){
  .dock-nav a{padding:0 7px;font-size:.95rem}
  .dock-nav dt{padding:0 4px}
}

/* ---------- 桌面分组下拉 ---------- */

@media (min-width:861px){
  .dock-nav dd{
    position:absolute;
    bottom:calc(100% + 2px);
    left:0;
    display:none;
    flex-direction:column;
    min-width:190px;
    background:var(--ink);
    border:2px solid var(--flame);
    padding:6px;
  }
  .dock-nav dd a{width:100%;padding:0 14px}
  .dock-nav dl:has(dt:nth-of-type(1):hover) .g1,
  .dock-nav dl:has(dt:nth-of-type(1):focus) .g1,
  .dock-nav dl:has(dt:nth-of-type(2):hover) .g2,
  .dock-nav dl:has(dt:nth-of-type(2):focus) .g2,
  .dock-nav dl:has(dt:nth-of-type(3):hover) .g3,
  .dock-nav dl:has(dt:nth-of-type(3):focus) .g3,
  .dock-nav dd:hover{display:flex}
}

/* ---------- 降级 ---------- */

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .anim [data-reveal]{opacity:1;transform:none;transition:none}
  .hero-art img{transform:none !important}
  *{transition-duration:.01ms !important}
}

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