@import url('https://fonts.googleapis.com/css2?family=Lexend+Mega:wght@100..900&family=Public+Sans:wght@100..900&display=swap');

:root{
  --paper:#f5e6c8;
  --paper-2:#eeddba;
  --paper-3:#e6d0a6;
  --accent:#d4a574;
  --ink:#262117;
  --ink-soft:#4a4034;
  --line:rgba(38,33,23,.3);
  --glass:rgba(255,250,238,.42);
  --bar:6.25rem;
  --head:"Lexend Mega","Public Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --body:"Public Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}

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

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  line-height:1.78;
  letter-spacing:.012em;
  overflow-x:hidden;
  padding-bottom:calc(var(--bar) + env(safe-area-inset-bottom,0px));
}

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

a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}
a:hover{color:#000;border-bottom-color:var(--ink)}

p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}

ul,ol{pargin:0}

h1,h2,h3{
  font-family:var(--head);
  font-weight:800;
  line-height:1.24;
  letter-spacing:.005em;
  margin:0 0 .7em;
}

/* ---------- 胶片颗粒 ---------- */
.grain{
  position:fixed;
  inset:0;
  z-index:60;
  pointer-events:none;
  opacity:.5;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.42'/%3E%3C/svg%3E");
  background-size:160px 160px;
}

/* ---------- 底部固定条 ---------- */
.site-head{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:50;
  display:flex;
  align-items:center;
  gap:.4rem;
  padding:.45rem .7rem calc(.45rem + env(safe-area-inset-bottom,0px));
  background:rgba(38,33,23,.95);
  color:var(--paper);
  border-top:3px solid var(--ink);
  box-shadow:0 -6px 24px rgba(38,33,23,.22);
}

.brand{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:44px;
  min-height:44px;
  border:2px solid var(--accent);
  color:var(--paper);
  background:rgba(212,165,116,.14);
  border-bottom:2px solid var(--accent);
}
.brand:hover{background:var(--accent);color:var(--ink)}
.brand .mark{width:22px;height:22px;display:block}

.nav{
  flex:1 1 auto;
  min-width:0;
  overflow:hidden;
}
.nav p{
  display:flex;
  align-items:center;
  gap:.1rem;
  margin:0;
  overflow-x:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.nav p::-webkit-scrollbar{display:none}

.nl{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  min-height:44px;
  padding:.5rem .62rem;
  color:var(--paper);
  font-size:.9rem;
  line-height:1.2;
  white-space:nowrap;
  border-bottom:2px solid transparent;
}
.nl:hover,.nl:focus-visible{
  color:#fff;
  border-bottom-color:var(--accent);
  background:rgba(245,230,200,.1);
}

.ico{
  flex:0 0 auto;
  width:11px;
  height:11px;
  border:2px solid currentColor;
  opacity:.85;
}
.ico-1{border-radius:0}
.ico-2{border-radius:50%}
.ico-3{transform:rotate(45deg)}
.ico-4{border-radius:0 50% 0 50%}
.ico-call{width:12px;height:12px;border-radius:2px 2px 40% 2px;border-color:var(--accent)}

.contact{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  min-height:44px;
  padding:.5rem .7rem;
  color:var(--paper);
  font-size:.88rem;
  border:2px solid var(--accent);
  background:rgba(212,165,116,.16);
  border-bottom:2px solid var(--accent);
}
.contact:hover{background:var(--accent);color:var(--ink)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  align-items:center;
  overflow:hidden;
  padding:2.5rem 1.15rem 3rem;
  background:
    radial-gradient(120% 80% at 88% 6%,rgba(212,165,116,.55),transparent 62%),
    linear-gradient(168deg,var(--paper-2),var(--paper) 58%,var(--paper-3));
}

.slash{
  position:absolute;
  left:-14%;
  right:-14%;
  top:52%;
  height:12vh;
  transform:rotate(-7deg);
  background:linear-gradient(90deg,var(--accent),rgba(212,165,116,.12));
  opacity:.75;
  pointer-events:none;
}

.hero-wrap{
  position:relative;
  z-index:2;
  width:100%;
  max-width:74rem;
  margin:0 auto;
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);
  gap:2rem;
  align-items:center;
}

.hero-fig{
  order:0;
  margin:0;
  padding:.7rem .7rem 2.6rem;
  background:rgba(255,251,240,.72);
  border:1px solid rgba(38,33,23,.35);
  box-shadow:14px 16px 0 rgba(38,33,23,.14);
  animation:shake 1.1s ease both;
  filter:sepia(.18) contrast(1.03) saturate(.82);
}
.hero-fig img{width:100%;aspect-ratio:4/5;object-fit:cover;background:var(--paper-3)}
.hero-fig figcaption{
  font-size:.8rem;
  letter-spacing:.16em;
  color:var(--ink-soft);
  padding-top:.6rem;
  border-top:1px dashed var(--line);
  margin-top:.55rem;
}

.hero-copy{
  order:1;
  text-align:center;
}
.eyebrow{
  font-family:var(--head);
  font-size:.76rem;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--ink-soft);
  margin:0 0 1rem;
}
.hero-copy h1{
  font-size:clamp(2rem,6.2vw,4rem);
  line-height:1.06;
  letter-spacing:-.012em;
  margin:0 0 1rem;
  text-shadow:4px 4px 0 rgba(212,165,116,.75);
}
.hero-sub{
  max-width:32rem;
  margin:0 auto 1.5rem;
  color:var(--ink-soft);
  font-size:1.02rem;
}
.hero-act{
  display:flex;
  flex-wrap:wrap;
  gap:.7rem;
  justify-content:center;
  margin:0;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:.7rem 1.5rem;
  font-family:var(--head);
  font-size:.94rem;
  letter-spacing:.06em;
  background:var(--ink);
  color:var(--paper);
  border:2px solid var(--ink);
  border-radius:0;
}
.btn:hover{background:var(--accent);color:var(--ink);border-color:var(--ink);border-bottom-color:var(--ink)}
.btn-ghost{background:transparent;color:var(--ink)}
.btn-ghost:hover{background:rgba(212,165,116,.5)}

/* ---------- 正文骨架 ---------- */
.doc{
  display:grid;
  grid-template-columns:14rem minmax(0,1fr);
  gap:0 2.6rem;
  align-items:start;
  max-width:76rem;
  margin:0 auto;
  padding:3rem 1.2rem 4rem;
  filter:sepia(.1) contrast(1.01);
}

.doc > aside{grid-column:1;grid-row:1}

.doc > section{
  grid-column:2;
  padding:1.8rem 0;
  border-top:1px dashed var(--line);
  animation:rise .55s ease both;
}
.doc > section:first-of-type{border-top:0;padding-top:0}

.rail{
  position:sticky;
  top:1.4rem;
  padding:1rem .9rem;
  background:var(--glass);
  border:1px solid rgba(38,33,23,.28);
  backdrop-filter:blur(7px);
}
.rail-list{
  list-style:none;
  margin:0 0 .8rem;
  padding:0;
  counter-reset:r;
}
.rail-list li+li{border-top:1px dotted var(--line)}
.rail-list a{
  display:flex;
  align-items:center;
  gap:.5rem;
  min-height:40px;
  padding:.35rem 0;
  font-size:.9rem;
  border-bottom:0;
  color:var(--ink-soft);
}
.rail-list a::before{
  counter-increment:r;
  content:counter(r,decimal-leading-zero);
  font-family:var(--head);
  font-size:.7rem;
  color:var(--accent);
  letter-spacing:.05em;
}
.rail-list a:hover{color:var(--ink);transform:translateX(2px)}

.tip{
  font-size:.8rem;
  line-height:1.6;
  color:var(--ink-soft);
  margin:0;
  padding-top:.7rem;
  border-top:2px solid var(--accent);
}

/* ---------- 标题装饰 ---------- */
.t{
  display:flex;
  align-items:baseline;
  gap:.55rem;
  font-size:.95rem;
  letter-spacing:.16em;
  margin:0 0 .7rem;
}
.t > span{
  position:relative;
  padding-left:1.1rem;
}
.t > span::before{
  content:"";
  position:absolute;
  left:0;
  top:.42em;
  width:.55rem;
  height:.55rem;
  background:var(--accent);
  border:1px solid var(--ink);
}

.doc h2{
  font-size:clamp(1.3rem,3.4vw,1.8rem);
  letter-spacing:.005em;
  margin:0 0 .75rem;
}
.doc h2 > span{background:linear-gradient(transparent 62%,rgba(212,165,116,.7) 62%)}
.doc h3{
  font-size:1.1rem;
  margin:1.4rem 0 .5rem;
}
.doc > article > p,
.doc > article > ul,
.doc > article > ol{
  max-width:44rem;
}
.doc ul,.doc ol{padding-left:1.15rem}
.doc li{margin-bottom:.4rem}
.doc strong{font-weight:700;background:rgba(212,165,116,.42);padding:0 .12em}
.doc blockquote{
  margin:1.2rem 0;
  padding:.75rem 1rem;
  background:var(--glass);
  border:1px solid var(--line);
  border-left:4px solid var(--accent);
}
.doc blockquote p{margin:0}

.doc article[id]{scroll-margin-top:1rem}

.lead p{font-size:1.06rem;color:var(--ink)}

/* ---------- 页脚 ---------- */
.site-foot{
  background:var(--ink);
  color:var(--paper);
  padding:2.2rem 1.2rem 2rem;
  border-top:4px solid var(--accent);
}
.fwrap{max-width:76rem;margin:0 auto}
.fcols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1.4rem;
  padding-bottom:1.6rem;
  border-bottom:1px solid rgba(245,230,200,.22);
}
.fcols dl{margin:0}
.fcols dt{
  font-family:var(--head);
  font-size:.78rem;
  letter-spacing:.2em;
  color:var(--accent);
  margin-bottom:.55rem;
}
.fcols dd{margin:0}
.fcols dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:.92rem;
  color:rgba(245,230,200,.86);
  border-bottom:1px solid transparent;
}
.fcols dd a:hover{color:#fff;border-bottom-color:var(--accent)}

.fbar{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:.5rem;
  padding-top:1.1rem;
  font-size:.84rem;
  color:rgba(245,230,200,.72);
}
.fbar a{color:rgba(245,230,200,.86);border-bottom-color:rgba(245,230,200,.3)}
.fbar a:hover{color:#fff}

/* ---------- 动效 ---------- */
@keyframes rise{
  from{opacity:0;transform:translateY(14px)}
  to{opacity:1;transform:none}
}
@keyframes shake{
  0%{opacity:0;transform:translate3d(0,-10px,0) rotate(-1.6deg)}
  45%{opacity:1;transform:translate3d(0,3px,0) rotate(.9deg)}
  100%{opacity:1;transform:none}
}

/* ---------- 移动端 ---------- */
@media (max-width:860px){
  :root{--bar:5.7rem}
  body{font-size:16.5px;line-height:1.72}
  .doc{
    grid-template-columns:minmax(0,1fr);
    gap:1.4rem;
    padding:2rem 1rem 3rem;
  }
  .doc > aside{
    grid-column:1;
    grid-row:auto;
    position:static;
    order:-1;
  }
  .doc > article{grid-column:1}
  .hero{
    min-height:auto;
    padding:2rem 1rem 2.6rem;
  }
  .hero-wrap{grid-template-columns:minmax(0,1fr);gap:1.5rem}
  .hero-copy{order:0}
  .hero-fig{order:1;box-shadow:8px 10px 0 rgba(38,33,23,.14)}
  .hero-fig img{aspect-ratio:16/10}
  .slash{top:auto;bottom:16%;height:9vh}
  .hero-copy h1{text-shadow:3px 3px 0 rgba(212,165,116,.75)}
  .hero-act{justify-content:center}
  .fcols{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:1rem 1.2rem}
  .fbar{flex-direction:column;gap:.35rem}
  .contact-txt{display:inline}
}

@media (max-width:420px){
  .hero-copy h1{font-size:1.85rem}
  .nl{font-size:.85rem;padding:.5rem .5rem}
  .contact-txt{display:none}
  .fcols{grid-template-columns:minmax(0,1fr)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

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