@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&family=Rubik:wght@300;400;500;600;700&display=swap');

:root{
  --white:#ffffff;
  --mist:#f5f5f5;
  --ink:#1f1f1f;
  --ink-2:#4b4b4b;
  --ink-3:#767676;
  --line:#e6e6e6;
  --radius:4px;
  --e1:0 1px 2px rgba(31,31,31,.06),0 2px 6px rgba(31,31,31,.05);
  --e2:0 6px 14px rgba(31,31,31,.08),0 12px 28px rgba(31,31,31,.06);
  --e3:0 12px 28px rgba(31,31,31,.10),0 28px 56px rgba(31,31,31,.08);
  --e4:0 20px 44px rgba(31,31,31,.14),0 44px 88px rgba(31,31,31,.12);
  --display:"Outfit","Rubik",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}

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

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

body{
  margin:0;
  padding:0 0 104px;
  background:var(--mist);
  background-image:
    radial-gradient(1100px 520px at 84% -12%,#ffffff 0,rgba(255,255,255,0) 62%),
    radial-gradient(820px 480px at -6% 104%,#ffffff 0,rgba(255,255,255,0) 58%);
  color:var(--ink);
  font-family:"Rubik",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.78;
  overflow-x:hidden;
}

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

a{color:var(--ink);text-decoration:none}

h1,h2,h3{font-family:var(--display);font-weight:700;line-height:1.18;letter-spacing:-.02em;margin:0 0 .6em}
h1{font-size:clamp(2rem,4.6vw,3.4rem)}
h2{font-size:clamp(1.35rem,2.4vw,1.8rem)}
h3{font-size:1.15rem}

section h2 span,.rail h2 span,.foot h2 span{
  background:linear-gradient(transparent 66%,#ececec 66%);
}

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

/* ---------- 角落纯图标品牌 ---------- */
.brandmark{
  position:fixed;top:16px;left:16px;z-index:60;
  width:50px;height:50px;
  display:grid;place-items:center;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--e2);
  transition:transform .2s ease,box-shadow .2s ease;
}
.brandmark:hover{transform:translateY(-2px);box-shadow:var(--e3)}
.brandmark img{width:26px;height:26px;object-fit:contain}
.mark-dot{font-family:var(--display);font-weight:700;font-size:19px;line-height:1}

/* ---------- 底部固定条 ---------- */
.dock{
  position:fixed;left:50%;bottom:14px;z-index:70;
  transform:translateX(-50%);
  width:min(520px,calc(100% - 28px));
  display:grid;grid-template-columns:auto 1fr;gap:10px;
  padding:10px;
  border-radius:8px;
  border:1px solid rgba(255,255,255,.9);
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  box-shadow:var(--e3);
}
.dock-btn,.dock-cta{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:0 18px;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background:var(--white);
  color:var(--ink);
  font-family:var(--display);font-weight:600;font-size:16px;letter-spacing:.02em;
  cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
}
.dock-btn{min-width:94px}
.dock-cta{width:100%;justify-self:end;background:var(--ink);color:var(--white);border-color:var(--ink);box-shadow:var(--e2)}
.dock-btn:hover,.dock-cta:hover{transform:translateY(-2px);box-shadow:var(--e3)}

/* ---------- 全屏遮罩菜单 ---------- */
.drawer{
  position:fixed;inset:0;z-index:90;
  display:flex;flex-direction:column;gap:18px;
  padding:20px 20px 36px;
  background:rgba(255,255,255,.93);
  backdrop-filter:blur(20px) saturate(150%);
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  box-shadow:var(--e4);
  transform:translateY(-102%);
  visibility:hidden;
  overflow:auto;
  transition:transform .42s cubic-bezier(.2,.8,.2,1),visibility .42s linear;
}
.drawer.open{transform:translateY(0);visibility:visible}
.drawer-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.drawer-brand{font-family:var(--display);font-weight:700;font-size:18px;letter-spacing:-.01em}
.drawer-x{
  min-height:44px;padding:0 16px;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--white);color:var(--ink);
  font-family:var(--display);font-weight:600;font-size:16px;cursor:pointer;
}
.drawer-nav ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.drawer-nav a{
  display:flex;align-items:center;
  min-height:56px;padding:10px 16px;
  background:var(--white);
  border-left:3px solid var(--mist);
  border-radius:var(--radius);
  box-shadow:var(--e1);
  font-family:var(--display);font-weight:600;font-size:18px;
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.drawer-nav a:hover{transform:translateX(5px);box-shadow:var(--e2);border-left-color:var(--ink)}

/* ---------- 主栅格 ---------- */
main{
  display:grid;
  grid-template-columns:minmax(0,1fr) 268px;
  gap:34px;
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:92px 24px 40px;
}
section{min-width:0}

div[id]{scroll-margin-top:96px}

/* ---------- 首屏（在主容器内做满宽出血，不越出视口） ---------- */
.hero{
  --pad:24px;
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  align-items:center;
  gap:28px;
  min-height:calc(100svh - 150px);
  margin-inline:calc(-1 * var(--pad));
  padding:24px var(--pad) 48px;
}
.hero::before{
  content:"";
  position:absolute;left:0;right:0;top:44%;height:118px;
  background:linear-gradient(90deg,#ffffff 0,#ffffff 50%,#ffffff 100%);
  transform:skewY(-3deg);
  z-index:0;
  pointer-events:none;
}
.hero-media{position:relative;z-index:1;height:clamp(220px,34vw,380px)}
.layer{position:absolute;border:1px solid var(--line);border-radius:var(--radius);background:var(--white)}
.layer-3{inset:18px 42px 34px 4px;transform:rotate(-6deg);box-shadow:var(--e1);background:#fbfbfb}
.layer-2{inset:8px 22px 14px 18px;transform:rotate(-2deg);box-shadow:var(--e2)}
.layer-1{inset:0 8px 0 30px;transform:rotate(1.5deg);box-shadow:var(--e4);overflow:hidden;background:linear-gradient(160deg,#ffffff,#ededed)}
.layer-1 img{width:100%;height:100%;object-fit:cover}
.hero-copy{position:relative;z-index:2;text-align:center}
.hero-lede{margin:0 auto 24px;max-width:30ch;color:var(--ink-2);font-size:17px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:52px;padding:0 26px;
  border-radius:var(--radius);
  background:var(--ink);color:var(--white);
  font-family:var(--display);font-weight:600;font-size:16px;
  box-shadow:var(--e3);
  transition:transform .18s ease,box-shadow .18s ease;
}
.btn:hover{transform:translateY(-2px);box-shadow:var(--e4)}
.btn-line{background:var(--white);color:var(--ink);border:1px solid var(--line);box-shadow:var(--e1)}

/* ---------- 正文卡片层 ---------- */
section > div[id]{
  position:relative;
  z-index:1;
  margin:0 0 26px;
  padding:30px 28px;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--e2);
  transition:transform .26s ease,box-shadow .26s ease;
}
section > div[id]:nth-of-type(even){transform:translateY(-7px);box-shadow:var(--e3);z-index:2}
section > div[id]:hover{transform:translateY(-11px);box-shadow:var(--e4);z-index:3}
section > div[id] p{color:#3a3a3a}
section > div[id] ul,section > div[id] ol{padding-left:1.3em}
section a{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}

/* ---------- 右侧目录 ---------- */
.rail{position:sticky;top:92px;z-index:1;display:grid;gap:14px}
.rail-title{font-size:1rem;letter-spacing:.08em;margin:0}
.rail-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.rail-list a{
  display:flex;align-items:center;
  min-height:44px;padding:8px 14px;
  background:var(--white);
  border-left:2px solid transparent;
  border-radius:var(--radius);
  box-shadow:var(--e1);
  font-size:16px;
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.rail-list a:hover{transform:translateX(-3px);box-shadow:var(--e2);border-left-color:var(--ink)}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:26px;
  padding:52px 24px 100px;
  background:var(--white);
  border-top:1px solid var(--line);
  box-shadow:0 -14px 44px rgba(31,31,31,.06);
}
.foot-cta{
  max-width:1180px;
  margin:0 auto 44px;
  display:grid;gap:16px;justify-items:start;
  padding:34px 28px;
  background:var(--mist);
  border-radius:8px;
  box-shadow:var(--e2);
}
.foot-cta h2{margin:0}
.foot-body{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:28px;
}
.fb-name{font-family:var(--display);font-weight:700;font-size:20px;margin:0 0 8px}
.fb-desc{margin:0;max-width:32ch;color:var(--ink-3);font-size:16px}
dl{margin:0}
dt{font-family:var(--display);font-weight:600;font-size:15px;letter-spacing:.08em;color:var(--ink-3);margin-bottom:10px}
dd{margin:0}
dd a{display:inline-flex;align-items:center;min-height:40px;font-size:16px;color:var(--ink-2)}
dd a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:4px}
.foot-bar{max-width:1180px;margin:36px auto 0;padding-top:18px;border-top:1px solid var(--line)}
.foot-bar p{margin:0;font-size:15px;color:var(--ink-3)}

/* ---------- 断点 ---------- */
@media (max-width:980px){
  main{grid-template-columns:minmax(0,1fr);gap:26px;padding:84px 18px 28px}
  .rail{position:static;order:2}
  .hero{--pad:18px;grid-template-columns:minmax(0,1fr);min-height:0;gap:22px;padding:8px var(--pad) 34px}
  .hero-copy{order:-1}
  .hero-media{height:236px}
  .foot-body{grid-template-columns:1fr 1fr}
  .fb-desc{max-width:none}
  .foot{padding:44px 18px 96px}
}

@media (max-width:560px){
  body{font-size:16px;padding-bottom:100px}
  .dock{left:12px;right:12px;bottom:12px;transform:none;width:auto}
  .hero-media{height:210px}
  section > div[id]{padding:24px 18px}
  section > div[id]:nth-of-type(even){transform:translateY(-4px)}
  .foot-body{grid-template-columns:1fr}
}

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

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