@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,700;1,400&display=swap');

:root{
  --paper:#ffffff;
  --mist:#f5f5f5;
  --veil:#ebebeb;
  --ink:#1f1f1f;
  --ink-soft:#4b4b4b;
  --ink-mute:#7a7a7a;
  --line:#e3e3e3;
  --line-2:#d3d3d3;
  --e1:0 1px 2px rgba(31,31,31,.06),0 2px 6px rgba(31,31,31,.05);
  --e2:0 2px 5px rgba(31,31,31,.07),0 8px 18px rgba(31,31,31,.07);
  --e3:0 4px 10px rgba(31,31,31,.08),0 16px 34px rgba(31,31,31,.10);
  --e4:0 8px 18px rgba(31,31,31,.10),0 28px 60px rgba(31,31,31,.14);
  --emboss:inset 0 1px 0 #fff,inset 0 -1px 0 rgba(31,31,31,.05);
  --glass:rgba(255,255,255,.72);
  --r:10px;
  --dock-h:76px;
}

*{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:1.75;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 82% -10%,#ffffff 0%,rgba(255,255,255,0) 60%),
    linear-gradient(180deg,#fbfbfb 0%,var(--mist) 40%,#efefef 100%);
  background-attachment:fixed,fixed;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;display:block;border:0}
a{color:var(--ink);text-decoration:none}
p{margin:0 0 1.05em}
:focus-visible{outline:2px solid #1f1f1f;outline-offset:3px;border-radius:4px}

/* ---------- 深度层与动效基座 ---------- */
.rv{animation:rise .72s cubic-bezier(.22,.68,.28,1) both}
@keyframes rise{
  from{opacity:0;transform:translate3d(0,22px,0) scale(.985)}
  to{opacity:1;transform:translate3d(0,0,0) scale(1)}
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  min-height:100vh;
  min-height:100svh;
  display:grid;
  align-items:center;
  padding:120px 24px 120px;
  overflow:hidden;
}

.hero::before{
  content:"";
  position:absolute;
  inset:-20% -10% auto auto;
  width:62%;
  height:120%;
  background:linear-gradient(200deg,rgba(255,255,255,.95),rgba(245,245,245,.4) 55%,rgba(255,255,255,0));
  transform:rotate(-9deg);
  z-index:0;
  pointer-events:none;
}

.slash{
  position:absolute;
  left:-14%;
  right:-14%;
  bottom:16%;
  height:150px;
  background:linear-gradient(96deg,#ffffff 0%,#efefef 48%,#fafafa 100%);
  box-shadow:var(--e2);
  transform:rotate(-6deg) translateZ(0);
  z-index:0;
  pointer-events:none;
}

.hero-stack{
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
}

.tile{
  position:absolute;
  margin:0;
  border-radius:var(--r);
  overflow:hidden;
  background:#fff;
  border:1px solid rgba(255,255,255,.9);
  box-shadow:var(--e3);
  will-change:transform;
}

.tile .shot,
.tile img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(.14) contrast(1.02);
}

.tile-blank{
  background:linear-gradient(150deg,#f0f0f0,#e2e2e2);
  box-shadow:var(--e2),var(--emboss);
}

.tile-a{
  z-index:1;
  top:14%;
  left:5%;
  width:33%;
  aspect-ratio:4/5;
  transform:rotate(-6deg);
  animation:float-a 13s ease-in-out infinite;
}
.tile-b{
  z-index:2;
  top:24%;
  left:25%;
  width:29%;
  aspect-ratio:3/4;
  transform:rotate(4.5deg);
  animation:float-b 16s ease-in-out infinite;
}
.tile-c{
  z-index:3;
  bottom:17%;
  left:12%;
  width:21%;
  aspect-ratio:1/1;
  transform:rotate(-2deg);
  animation:float-a 19s ease-in-out infinite reverse;
}

@keyframes float-a{
  0%,100%{transform:rotate(-6deg) translate3d(0,0,0)}
  50%{transform:rotate(-6deg) translate3d(0,-14px,0)}
}
@keyframes float-b{
  0%,100%{transform:rotate(4.5deg) translate3d(0,0,0)}
  50%{transform:rotate(4.5deg) translate3d(0,12px,0)}
}

.hero-copy{
  position:relative;
  z-index:4;
  margin-left:auto;
  max-width:44ch;
  text-align:right;
  animation-delay:.1s;
}

.hero-title{
  margin:0 0 .5em;
  font-size:clamp(2rem,4.6vw,3.5rem);
  line-height:1.24;
  letter-spacing:-.015em;
  font-weight:700;
  text-shadow:0 1px 0 #fff,0 12px 26px rgba(31,31,31,.10);
}

.hero-sub{
  margin:0;
  color:var(--ink-soft);
  font-size:1rem;
  line-height:1.8;
  text-shadow:0 1px 0 #fff;
}

/* ---------- 主体骨架 ---------- */
.shell{
  position:relative;
  z-index:2;
  max-width:1180px;
  margin:0 auto;
  padding:0 22px calc(var(--dock-h) + 80px);
  display:grid;
  grid-template-columns:276px minmax(0,1fr);
  gap:30px;
  align-items:start;
}

.rail{
  position:sticky;
  top:26px;
  animation-delay:.18s;
}

.rail-card{
  border-radius:var(--r);
  padding:18px 18px 8px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(1.1);
  backdrop-filter:blur(14px) saturate(1.1);
  border:1px solid rgba(255,255,255,.85);
  box-shadow:var(--e3),var(--emboss);
  transform:translateZ(0);
}

.rail-h{
  margin:0 0 .7em;
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--ink-mute);
  text-transform:uppercase;
}

.rail-list{
  list-style:none;
  counter-reset:rail;
  margin:0;
  padding:0 0 10px;
}

.rail-list li{
  counter-increment:rail;
  border-top:1px solid var(--line);
}

.rail-list li:first-child{border-top:0}

.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 2px;
  font-size:.95rem;
  color:var(--ink-soft);
  transition:color .18s ease,transform .18s ease;
}

.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.06em;
  color:#b6b6b6;
  min-width:1.9em;
}

.rail-list a:hover{
  color:var(--ink);
  transform:translateX(3px);
}

.main{min-width:0}
.wrap{min-width:0}

.stage{
  position:relative;
  border-radius:16px;
  padding:0;
}

.board{
  position:relative;
  z-index:1;
  padding:26px 26px 10px;
  border-radius:18px;
  background:var(--paper);
  border:1px solid var(--line);
  box-shadow:var(--e4);
}

.board > section{
  scroll-margin-top:calc(var(--dock-h) + 34px);
  padding:26px 0 22px;
  border-top:1px solid var(--line);
}
.board > section:first-child{border-top:0;padding-top:6px}
.board > section:last-child{padding-bottom:12px}

/* ---------- 正文排版 ---------- */
.board h2{
  position:relative;
  margin:0 0 .75em;
  font-size:clamp(1.32rem,2.1vw,1.62rem);
  line-height:1.35;
  letter-spacing:-.01em;
  font-weight:700;
}

.board h2 > span{
  position:relative;
  display:inline-block;
  padding-bottom:.28em;
}

.board h2 > span::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--ink) 0%,var(--ink) 12%,#c7c7c7 12%,#e8e8e8 100%);
}

.board h3{
  margin:1.6em 0 .55em;
  font-size:1.1rem;
  line-height:1.45;
  font-weight:700;
}

.board h3 > span{position:relative;display:inline-block}

.board h4{
  margin:1.4em 0 .4em;
  font-size:1rem;
  font-weight:700;
  color:var(--ink-soft);
}

.board p{color:var(--ink-soft)}
.board strong{color:var(--ink);font-weight:700}

.board ul,
.board ol{
  margin:0 0 1.1em;
  padding-left:1.35em;
  color:var(--ink-soft);
}

.board li{margin:.35em 0}

.board a{
  color:var(--ink);
  border-bottom:1px solid var(--line-2);
  transition:border-color .18s ease,background .18s ease;
}
.board a:hover{
  border-color:var(--ink);
  background:#f3f3f3;
}

.board blockquote{
  margin:1.3em 0;
  padding:16px 18px;
  border-left:3px solid var(--ink);
  border-radius:0 var(--r) var(--r) 0;
  background:var(--mist);
  box-shadow:var(--emboss);
  color:var(--ink-soft);
}
.board blockquote p:last-child{margin-bottom:0}

.board figure{margin:1.3em 0}
.board figure img{border-radius:var(--r);box-shadow:var(--e2)}
.board figcaption{
  margin-top:.5em;
  font-size:.86rem;
  color:var(--ink-mute);
}

.board table{
  width:100%;
  border-collapse:collapse;
  margin:1.2em 0;
  font-size:.94rem;
}
.board th,
.board td{
  border:1px solid var(--line);
  padding:9px 11px;
  text-align:left;
}
.board th{background:var(--mist);font-weight:700}

.board pre{
  overflow-x:auto;
  padding:15px;
  border-radius:var(--r);
  background:#1f1f1f;
  color:#f2f2f2;
  font-size:.88rem;
  line-height:1.6;
}
.board code{font-size:.92em}
.board pre code{color:inherit}

.board hr{
  border:0;
  height:1px;
  background:var(--line);
  margin:1.6em 0;
}

.board time{
  display:inline-block;
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--ink-mute);
  background:var(--mist);
  border-radius:6px;
  padding:2px 8px;
  box-shadow:var(--emboss);
}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;
  z-index:2;
  margin-top:20px;
  padding:56px 22px calc(var(--dock-h) + 46px);
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:34px 26px;
  background:linear-gradient(180deg,#ffffff,#efefef);
  border-top:1px solid var(--line);
  box-shadow:inset 0 1px 0 #fff;
}

.foot-top{grid-column:1 / -1}

.foot-brand{
  margin:0;
  font-size:clamp(2.4rem,9vw,5.4rem);
  line-height:1;
  font-weight:700;
  letter-spacing:-.045em;
  color:#dcdcdc;
  text-shadow:0 1px 0 #fff,0 -1px 0 rgba(31,31,31,.06);
  word-break:break-all;
}
.foot-brand > span{display:inline-block}

.foot-nav{
  grid-column:1 / -1;
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}

.foot-dl{margin:0}

.foot-dl dt{
  margin:0 0 .5em;
  font-size:.76rem;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--ink-mute);
}

.foot-dl dd{margin:0}

.foot-dl a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:4px 0;
  font-size:.95rem;
  color:var(--ink-soft);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease,transform .18s ease;
}

.foot-dl dt a{
  font-size:1rem;
  font-weight:700;
  color:var(--ink);
  letter-spacing:.01em;
}

.foot-dl a:hover{
  color:var(--ink);
  border-color:var(--ink);
  transform:translateX(2px);
}

.foot-base{
  grid-column:1 / -1;
  display:flex;
  flex-wrap:wrap;
  gap:12px 20px;
  align-items:center;
  justify-content:space-between;
  padding-top:20px;
  border-top:1px solid var(--line-2);
}

.copy{
  margin:0;
  font-size:.85rem;
  color:var(--ink-mute);
}

.foot-jump{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:6px 14px;
  border-radius:999px;
  font-size:.85rem;
  font-weight:700;
  color:var(--ink);
  background:#fff;
  box-shadow:var(--e2),var(--emboss);
  transition:transform .18s ease,box-shadow .18s ease;
}
.foot-jump:hover{
  transform:translateY(-2px);
  box-shadow:var(--e3),var(--emboss);
}

/* ---------- 悬浮导航条 ---------- */
.dock{
  position:fixed;
  z-index:60;
  left:50%;
  bottom:14px;
  transform:translateX(-50%);
  width:min(560px,calc(100% - 24px));
  display:flex;
  align-items:center;
  gap:8px;
  padding:8px;
  border-radius:16px;
  background:rgba(255,255,255,.78);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  backdrop-filter:blur(16px) saturate(1.2);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:var(--e4),var(--emboss);
}

.dock-logo{
  flex:0 0 auto;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border-radius:11px;
  background:var(--ink);
  color:#fff;
  box-shadow:var(--e2);
  overflow:hidden;
}
.dock-logo img{width:24px;height:24px;border-radius:6px;object-fit:cover}
.dock-ini{font-size:1rem;font-weight:700;letter-spacing:.02em}

.dock-cta{
  flex:1 1 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  padding:0 16px;
  border-radius:11px;
  font-size:.92rem;
  font-weight:700;
  color:var(--ink);
  background:var(--mist);
  box-shadow:var(--emboss);
  transition:background .18s ease,transform .18s ease;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.dock-cta:hover{background:#ededed;transform:translateY(-1px)}

.dock-btn{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:46px;
  padding:0 14px;
  border:0;
  border-radius:11px;
  font:inherit;
  font-size:.92rem;
  font-weight:700;
  color:#fff;
  background:var(--ink);
  box-shadow:var(--e2);
  cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease;
}
.dock-btn:hover{transform:translateY(-1px);box-shadow:var(--e3)}

.bars{
  display:inline-flex;
  flex-direction:column;
  gap:4px;
  width:16px;
}
.bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:#fff;
  transition:transform .24s ease,opacity .2s ease;
}
.dock-btn[aria-expanded="true"] .bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.dock-btn[aria-expanded="true"] .bars i:nth-child(2){opacity:0}
.dock-btn[aria-expanded="true"] .bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.dock-btn-t{display:inline}

/* ---------- 全屏遮罩菜单 ---------- */
.sheet{
  position:fixed;
  inset:0;
  z-index:55;
  display:grid;
  align-content:center;
  justify-items:center;
  padding:80px 24px calc(var(--dock-h) + 40px);
  background:rgba(245,245,245,.86);
  -webkit-backdrop-filter:blur(20px) saturate(1.1);
  backdrop-filter:blur(20px) saturate(1.1);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .3s ease,visibility .3s ease;
}

.sheet.open,
.sheet.is-open,
.sheet.show,
body.menu-open .sheet,
body.nav-open .sheet,
.dock:has(.dock-btn[aria-expanded="true"]) + .sheet{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
}

.sheet-nav ol{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:6px;
  justify-items:center;
  counter-reset:sheet;
}

.sheet-nav li{
  counter-increment:sheet;
  width:100%;
  max-width:420px;
}

.sheet-nav a{
  display:block;
  padding:12px 18px;
  min-height:52px;
  border-radius:12px;
  text-align:center;
  font-size:1.12rem;
  font-weight:700;
  color:var(--ink);
  background:rgba(255,255,255,.72);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:var(--e2),var(--emboss);
  transition:transform .2s ease,box-shadow .2s ease;
  animation:rise .45s ease both;
}
.sheet-nav a::before{
  content:counter(sheet,decimal-leading-zero);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--ink-mute);
  margin-right:10px;
}
.sheet-nav a:hover{
  transform:translateY(-2px);
  box-shadow:var(--e3),var(--emboss);
}

/* ---------- 悬停微交互 ---------- */
@media (hover:hover) and (pointer:fine){
  .tile{transition:transform .5s cubic-bezier(.22,.68,.28,1),box-shadow .5s ease}
  .tile-a:hover{transform:rotate(-3deg) scale(1.03);box-shadow:var(--e4)}
  .tile-b:hover{transform:rotate(2deg) scale(1.03);box-shadow:var(--e4)}
  .rail-card:hover{box-shadow:var(--e4),var(--emboss)}
}

/* ---------- 断点 ---------- */
@media (max-width:1024px){
  .shell{grid-template-columns:230px minmax(0,1fr);gap:22px}
  .tile-a{width:36%}
  .tile-b{width:32%}
}

@media (max-width:860px){
  body{font-size:16.5px}
  .hero{
    display:block;
    min-height:0;
    padding:80px 20px 60px;
  }
  .hero::before{width:86%;transform:rotate(-7deg)}
  .slash{bottom:auto;top:38vh;height:110px}
  .hero-stack{
    position:absolute;
    inset:0 0 auto 0;
    height:44vh;
  }
  .tile-a{top:8%;left:4%;width:38%;transform:rotate(-5deg)}
  .tile-b{top:16%;left:30%;width:34%;transform:rotate(4deg)}
  .tile-c{top:30%;left:8%;bottom:auto;width:22%}
  .hero-copy{
    position:relative;
    z-index:4;
    margin-top:46vh;
    max-width:none;
    text-align:left;
  }
  .hero-title{font-size:clamp(1.7rem,7vw,2.3rem)}
  .shell{
    grid-template-columns:minmax(0,1fr);
    padding:0 16px calc(var(--dock-h) + 70px);
    gap:20px;
  }
  .rail{position:static}
  .rail-card{padding:14px 14px 6px}
  .rail-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 12px}
  .rail-list li:nth-child(2){border-top:0}
  .board{padding:20px 18px 8px;border-radius:14px;box-shadow:var(--e3)}
  .foot{
    grid-template-columns:minmax(0,1fr);
    gap:26px;
    padding:44px 18px calc(var(--dock-h) + 44px);
  }
  .foot-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
  .foot-base{flex-direction:column;align-items:flex-start}
}

@media (max-width:420px){
  .dock{width:calc(100% - 16px);bottom:10px}
  .dock-btn-t{display:none}
  .dock-btn{width:46px;justify-content:center;padding:0}
  .foot-nav{grid-template-columns:minmax(0,1fr)}
  .rail-list{grid-template-columns:minmax(0,1fr)}
  .rail-list li:nth-child(2){border-top:1px solid var(--line)}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .rv,
  .tile,
  .sheet-nav a{animation:none !important}
  .tile-a,.tile-b,.tile-c{animation:none !important}
  .sheet,.sheet-nav a,.foot-jump,.dock-btn,.dock-cta{transition:none}
}

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