:root{
  --ink:#1f1f1f;
  --paper:#ffffff;
  --mist:#f5f5f5;
  --edge:#e4e4e4;
  --soft:#4b4b4b;
  --e1:0 1px 2px rgba(31,31,31,.07),0 2px 6px rgba(31,31,31,.05);
  --e2:0 2px 5px rgba(31,31,31,.08),0 10px 20px rgba(31,31,31,.06);
  --e3:0 5px 10px rgba(31,31,31,.09),0 18px 38px rgba(31,31,31,.09);
  --e4:0 10px 20px rgba(31,31,31,.1),0 32px 64px rgba(31,31,31,.14);
  --r:4px;
}

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

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

body{
  margin:0;
  background:var(--mist);
  color:var(--ink);
  font-family:'Baloo 2','Comic Neue',"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.68;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

body.menu-open{overflow:hidden}

a{color:var(--ink)}

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

hr{
  border:0;
  border-top:2px solid var(--ink);
  width:48px;
  margin:10px 0 16px;
  opacity:.9;
}

.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 clamp(16px,4vw,32px);
}

/* 顶部两行：品牌独占一行，菜单在下一行 */
.top{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--edge);
  box-shadow:var(--e1);
}

.top-brand{
  max-width:1120px;
  margin:0 auto;
  padding:12px clamp(16px,4vw,32px) 10px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  font-weight:700;
  font-size:1.15rem;
  letter-spacing:.01em;
  min-height:44px;
}

.brand-dot{
  width:26px;
  height:26px;
  border-radius:var(--r);
  background:var(--ink);
  box-shadow:var(--e2),inset 0 0 0 1px rgba(255,255,255,.35);
  position:relative;
  flex:0 0 auto;
}

.brand-dot::after{
  content:"";
  position:absolute;
  inset:7px;
  border-radius:2px;
  background:var(--paper);
  opacity:.9;
}

.brand-mark{
  width:34px;
  height:34px;
  border-radius:var(--r);
  border:1px solid var(--edge);
  box-shadow:var(--e1);
  flex:0 0 auto;
  object-fit:cover;
}

.brand-sm{font-size:1rem}

.top-side{
  display:flex;
  align-items:center;
  gap:8px;
}

.top-contact{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 14px;
  border:1px solid var(--ink);
  border-radius:var(--r);
  text-decoration:none;
  font-size:1rem;
  background:var(--paper);
  box-shadow:var(--e1);
}

.top-contact:hover{box-shadow:var(--e2);transform:translateY(-1px)}
.top-contact{transition:transform .18s ease,box-shadow .18s ease}

.burger{
  display:none;
  width:44px;
  height:44px;
  padding:0;
  border:1px solid var(--ink);
  border-radius:var(--r);
  background:var(--ink);
  box-shadow:var(--e2);
  cursor:pointer;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  position:relative;
  z-index:60;
}

.burger-bar{
  display:block;
  width:20px;
  height:2px;
  background:var(--paper);
  border-radius:2px;
  transition:transform .22s ease,opacity .22s ease;
}

body.js .burger{display:inline-flex}
body.menu-open .burger-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.menu-open .burger-bar:nth-child(2){opacity:0}
body.menu-open .burger-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.top-nav{
  max-width:1120px;
  margin:0 auto;
  padding:0 clamp(16px,4vw,32px) 10px;
}

.top-nav p{
  display:flex;
  flex-wrap:wrap;
  gap:4px 16px;
  margin:0;
}

.top-nav a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 4px;
  font-size:1rem;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.top-nav a:hover{border-bottom-color:var(--ink)}

body.js .top-nav{
  position:fixed;
  inset:0;
  z-index:45;
  max-width:none;
  margin:0;
  padding:110px 26px 48px;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:auto;
  opacity:0;
  visibility:hidden;
  transition:opacity .24s ease,visibility .24s ease;
}

body.js .top-nav p{
  flex-direction:row;
  flex-wrap:wrap;
  justify-content:center;
  gap:10px 28px;
  max-width:760px;
}

body.js .top-nav a{
  font-size:1.4rem;
  font-weight:600;
  padding:10px 8px;
  min-height:48px;
  border-bottom:2px solid transparent;
}

body.js.menu-open .top-nav{opacity:1;visibility:visible}

/* 首屏 */
.pitch{
  position:relative;
  margin:26px 0 34px;
  background:var(--paper);
  border:1px solid var(--edge);
  border-bottom:4px solid var(--ink);
  border-radius:var(--r);
  box-shadow:var(--e4);
  min-height:66vh;
  display:grid;
  grid-template-columns:minmax(0,1fr) 230px;
  align-items:center;
  gap:30px;
  padding:clamp(26px,5vw,52px);
  z-index:1;
}

.pitch-body{position:relative;z-index:2}

.eyebrow{
  display:inline-block;
  margin:0 0 14px;
  padding:6px 12px;
  font-size:1rem;
  letter-spacing:.14em;
  border:1px solid var(--ink);
  border-radius:var(--r);
  background:var(--mist);
  box-shadow:var(--e1);
}

.pitch h1{
  margin:0 0 14px;
  font-size:clamp(1.95rem,5.4vw,3.15rem);
  line-height:1.16;
  letter-spacing:-.01em;
}

.lede{
  margin:0 0 22px;
  max-width:44ch;
  color:var(--soft);
  font-size:1.05rem;
}

.pitch-acts{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:0 22px;
  border-radius:var(--r);
  border:1px solid var(--ink);
  font-size:1rem;
  font-weight:600;
  text-decoration:none;
  box-shadow:var(--e2);
  transition:transform .18s ease,box-shadow .18s ease;
}

.btn:hover{transform:translateY(-2px);box-shadow:var(--e3)}
.btn:active{transform:translateY(0);box-shadow:var(--e1)}

.btn-solid{background:var(--ink);color:var(--paper)}
.btn-line{background:var(--paper);color:var(--ink)}

.sticker{
  position:relative;
  z-index:2;
  width:186px;
  height:186px;
  justify-self:center;
  display:grid;
  place-items:center;
  align-content:center;
  gap:6px;
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:var(--r);
  box-shadow:var(--e3);
  transform:rotate(4deg);
  text-align:center;
  padding:12px;
}

.sticker-img{
  width:100%;
  height:100%;
  object-fit:cover;
  border-radius:2px;
}

.sticker-ring{
  width:44px;
  height:44px;
  border-radius:50%;
  border:3px solid var(--ink);
  box-shadow:inset 0 0 0 5px var(--mist);
}

.sticker-word{font-size:1.3rem;letter-spacing:.16em}
.sticker-sub{font-size:1rem;font-style:normal;color:var(--soft);letter-spacing:.08em}

.chips{
  position:absolute;
  inset:0;
  z-index:3;
  pointer-events:none;
}

.chip{
  position:absolute;
  padding:6px 12px;
  font-size:1rem;
  background:var(--paper);
  border:1px solid var(--ink);
  border-radius:var(--r);
  box-shadow:var(--e2);
  animation:bob 6s ease-in-out infinite;
}

.chip-a{top:14px;right:16px;transform:rotate(-3deg)}
.chip-b{bottom:14px;left:16px;animation-delay:-2s;transform:rotate(2deg)}
.chip-c{bottom:58px;right:22px;animation-delay:-4s;transform:rotate(3deg);background:var(--ink);color:var(--paper);border-color:var(--ink)}

@keyframes bob{
  0%,100%{translate:0 0}
  50%{translate:0 -6px}
}

/* 内容区：左侧栏 + 正文叠层 */
.board{
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  gap:26px;
  align-items:start;
  padding-bottom:44px;
}

.rail{
  position:sticky;
  top:96px;
  z-index:4;
  display:grid;
  gap:14px;
}

.rail-card{
  background:var(--paper);
  border:1px solid var(--edge);
  border-bottom:3px solid var(--ink);
  border-radius:var(--r);
  box-shadow:var(--e1);
  padding:16px 16px 18px;
}

.rail-card h2{
  margin:0;
  font-size:1rem;
  letter-spacing:.12em;
}

.rail-card hr{width:38px;margin:8px 0 12px}

.rail-card p{
  margin:0;
  font-size:1rem;
  color:var(--soft);
}

.jump{
  counter-reset:step;
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:6px;
}

.jump li{counter-increment:step}

.jump a{
  display:flex;
  align-items:baseline;
  gap:9px;
  min-height:42px;
  padding:9px 10px;
  background:var(--paper);
  border:1px solid var(--edge);
  border-radius:var(--r);
  box-shadow:var(--e1);
  text-decoration:none;
  font-size:1rem;
  line-height:1.3;
  transition:transform .16s ease,box-shadow .16s ease;
}

.jump a::before{
  content:counter(step,decimal-leading-zero);
  font-weight:700;
  color:#8a8a8a;
  flex:0 0 auto;
}

.jump a:hover{transform:translateX(3px);box-shadow:var(--e2)}

.sheet{
  position:relative;
  z-index:2;
  min-width:0;
}

.sheet > article{
  position:relative;
  background:var(--paper);
  border:1px solid var(--edge);
  border-bottom:3px solid var(--ink);
  border-radius:var(--r);
  box-shadow:var(--e2);
  padding:24px clamp(18px,3vw,30px) 28px;
  scroll-margin-top:150px;
}

.sheet > article + article{margin-top:-10px}
.sheet > article:nth-child(1){z-index:1}
.sheet > article:nth-child(2){z-index:2}
.sheet > article:nth-child(3){z-index:3}
.sheet > article:nth-child(4){z-index:4}
.sheet > article:nth-child(n+5){z-index:2}

.sheet h2{
  margin:0 0 2px;
  font-size:1.4rem;
  line-height:1.25;
}

.sheet h3{
  margin:1.2em 0 .3em;
  font-size:1.12rem;
}

.sheet p{margin:.7em 0}
.sheet ul,.sheet ol{padding-left:1.35em;margin:.7em 0}
.sheet li{margin:.35em 0}
.sheet strong{font-weight:700}

.sheet a{
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

.sheet a:hover{text-decoration-thickness:2px}

.sheet img{
  display:block;
  margin:1em 0;
  border-radius:var(--r);
  border:1px solid var(--edge);
  box-shadow:var(--e1);
}

.sheet blockquote{
  margin:1em 0;
  padding:12px 16px;
  background:var(--mist);
  border-left:3px solid var(--ink);
  border-radius:0 var(--r) var(--r) 0;
  color:var(--soft);
}

.sheet table{
  width:100%;
  border-collapse:collapse;
  margin:1em 0;
  font-size:1rem;
}

.sheet th,.sheet td{
  border:1px solid var(--edge);
  padding:9px 10px;
  text-align:left;
}

.sheet th{background:var(--mist)}

/* 页脚：大 CTA 块 + 单行底栏 */
.foot{
  background:var(--paper);
  border-top:3px solid var(--ink);
  padding:34px 0 26px;
  box-shadow:0 -6px 24px rgba(31,31,31,.05);
}

.foot-cta{
  max-width:1120px;
  margin:0 auto 28px;
  padding:26px clamp(18px,4vw,38px) 30px;
  background:var(--mist);
  border:1px solid var(--edge);
  border-bottom:4px solid var(--ink);
  border-radius:var(--r);
  box-shadow:var(--e3);
}

.foot-cta h2{
  margin:0;
  font-size:clamp(1.25rem,3vw,1.7rem);
  line-height:1.3;
}

.foot-cta p{
  margin:0 0 20px;
  max-width:56ch;
  color:var(--soft);
}

.foot-line{
  max-width:1120px;
  margin:0 auto;
  padding:20px clamp(18px,4vw,38px) 0;
  border-top:1px solid var(--edge);
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:18px;
}

.foot-nav p{
  display:flex;
  flex-wrap:wrap;
  gap:2px 14px;
  margin:0;
  justify-content:center;
}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 4px;
  font-size:1rem;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.foot-nav a:hover{border-bottom-color:var(--ink)}

.foot-copy{text-align:right}
.foot-copy p{
  margin:0;
  font-size:1rem;
  color:var(--soft);
}

/* 入场动效 */
@keyframes rise{
  from{opacity:0;transform:translateY(16px)}
  to{opacity:1;transform:none}
}

.js .sheet > article,
.js .rail-card{opacity:0}

.js .sheet > article.in,
.js .rail-card.in{animation:rise .5s cubic-bezier(.2,.75,.3,1) forwards}

@media (max-width:900px){
  .pitch{
    grid-template-columns:minmax(0,1fr);
    min-height:0;
    padding-top:36px;
    gap:22px;
  }

  .sticker{
    width:136px;
    height:136px;
    justify-self:start;
    margin-left:2px;
  }

  .chip{font-size:1rem;padding:5px 10px}
  .chip-a{top:10px;right:10px}
  .chip-c{bottom:auto;top:10px;right:auto;left:10px}
  .chip-b{bottom:10px;right:12px;left:auto}

  .board{grid-template-columns:minmax(0,1fr);gap:20px}
  .rail{position:static;grid-template-columns:minmax(0,1fr);top:auto}

  .foot-line{grid-template-columns:minmax(0,1fr);gap:10px}
  .foot-nav p{justify-content:flex-start}
  .foot-copy{text-align:left}
}

@media (max-width:420px){
  body{font-size:16px}
  .top-contact{padding:0 10px;font-size:1rem}
  .brand{font-size:1rem}
  .brand-name{max-width:9em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .pitch-acts .btn{width:100%}
  .sheet > article{padding:20px 16px 24px}
}

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

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