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

:root{
  --paper:#f4efe5;
  --paper2:#e8e0d0;
  --ink:#172623;
  --ink-soft:#31443e;
  --clay:#5cc6b0;
  --clay-d:#369080;
  --sand:#d4c4a8;
  --line:rgba(23,38,35,.14);
  --rail:200px;
  --side:252px;
  --ff:"Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --fm:"Space Mono",ui-monospace,"Courier New",monospace;
  --fs:"Syncopate","Space Mono",var(--ff);
  --ease:cubic-bezier(.2,.7,.2,1);
}

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

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

body{
  margin:0;
  font-family:var(--ff);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:radial-gradient(130% 90% at 6% -10%,#fbf7ef 0%,var(--paper) 42%,var(--paper2) 100%);
  background-attachment:fixed;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:9;
  pointer-events:none;
  opacity:.16;
  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='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23g)' opacity='0.55'/%3E%3C/svg%3E");
  background-size:160px 160px;
}

body.is-menu-open{overflow:hidden}

a{color:var(--clay-d)}

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

img{max-width:100%}

/* 左侧固定栏 */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  z-index:60;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:.85rem;
  padding:1.6rem 1.25rem;
  background:var(--ink);
  color:var(--sand);
  border-right:1px solid rgba(212,196,168,.16);
}

.brand{
  display:flex;
  flex-direction:column;
  gap:.7rem;
  text-decoration:none;
  color:var(--sand);
  position:relative;
  z-index:2;
  padding:.2rem .2rem 0;
}

.brand-mark{
  display:inline-grid;
  place-items:center;
  width:2.1rem;
  height:2.1rem;
  border:1px solid var(--clay);
  color:var(--clay);
  font-family:var(--fs);
  font-size:.95rem;
  line-height:1;
}

.brand-name{
  font-family:var(--fs);
  font-size:1rem;
  letter-spacing:.16em;
  line-height:1.5;
}

.menu-btn{
  position:relative;
  z-index:2;
  width:100%;
  min-height:44px;
  padding:.6rem .8rem;
  margin-top:.4rem;
  font:inherit;
  font-size:1rem;
  letter-spacing:.18em;
  color:var(--sand);
  background:transparent;
  border:1px solid rgba(212,196,168,.5);
  border-radius:0;
  cursor:pointer;
  transition:background .3s var(--ease),color .3s var(--ease);
}
.menu-btn:hover{background:var(--clay);color:var(--ink);border-color:var(--clay)}

.rail-contact{
  position:relative;
  z-index:2;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.2rem .2rem;
  font-size:1rem;
  letter-spacing:.14em;
  color:var(--clay);
  text-decoration:none;
  border-bottom:1px solid rgba(92,198,176,.4);
}
.rail-contact:hover{color:var(--sand);border-color:var(--sand)}

/* 全屏遮罩菜单 */
.menu{
  position:fixed;
  inset:0;
  z-index:1;
  padding:clamp(4.5rem,13vh,7rem) clamp(1.4rem,7vw,5rem) 2rem;
  background:#12201e;
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .35s ease-out,visibility .35s ease-out;
}
body.is-menu-open .menu{opacity:1;visibility:visible;pointer-events:auto}

.menu ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:0 clamp(1rem,4vw,3rem);
}

.menu li{border-bottom:1px solid rgba(212,196,168,.22)}

.menu a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:.6rem .2rem;
  color:var(--sand);
  text-decoration:none;
  font-size:clamp(1.05rem,2.2vw,1.3rem);
  letter-spacing:.14em;
  transition:color .28s var(--ease),padding-left .28s var(--ease);
}
.menu a:hover,.menu a:focus-visible{color:var(--clay);padding-left:.9rem}

/* 主体 */
main{
  margin-left:var(--rail);
  padding:clamp(1.5rem,3vw,2.5rem) calc(var(--side) + clamp(1rem,3vw,3rem)) 4rem clamp(1rem,3vw,3rem);
  display:flex;
  flex-direction:column;
  gap:clamp(1.6rem,3vw,2.6rem);
  counter-reset:seg;
  min-height:60vh;
}

main > div,
main > aside.side{
  width:100%;
  max-width:820px;
  margin-left:auto;
  margin-right:auto;
}

/* 首屏 */
.hero{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:clamp(1rem,3vw,2rem);
  align-items:center;
  min-height:45vh;
  padding-block:clamp(.5rem,2vh,1.5rem);
}

.hero-copy h1{
  margin:0 0 1rem;
  padding-left:1rem;
  border-left:4px solid var(--clay);
  font-size:clamp(1.85rem,4vw,2.7rem);
  line-height:1.24;
  letter-spacing:.01em;
  overflow-wrap:break-word;
}

.lede{
  margin:0 0 1.4rem;
  max-width:36ch;
  color:var(--ink-soft);
  font-size:1.05rem;
}

.hero-act{margin:0}

.btn{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:.6rem 1.5rem;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  letter-spacing:.18em;
  border-bottom:3px solid var(--clay);
  transition:background .3s var(--ease),color .3s var(--ease);
}
.btn:hover{background:var(--clay);color:var(--ink)}

.hero-art{
  position:relative;
  margin:0;
  overflow:hidden;
  align-self:stretch;
  min-height:30vh;
  background:linear-gradient(160deg,var(--paper2),#ded3bf);
  border:1px solid var(--line);
}

.hero-art img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  transform:scale(1.06);
  will-change:transform;
}

.hero-mono{
  display:grid;
  place-items:center;
  height:100%;
  min-height:26vh;
  padding:1.2rem;
  text-align:center;
  font-family:var(--fs);
  font-size:clamp(1.3rem,2.8vw,2rem);
  letter-spacing:.14em;
  color:var(--clay-d);
}

.hero-tag{
  position:absolute;
  left:.9rem;
  bottom:1rem;
  padding:.4rem .85rem;
  background:var(--ink);
  color:var(--clay);
  font-size:1rem;
  letter-spacing:.1em;
  transform:rotate(-2deg);
}

/* 右侧栏 */
.side{
  position:fixed;
  top:0;
  right:0;
  z-index:8;
  width:var(--side);
  height:100vh;
  max-width:none;
  margin:0;
  overflow-y:auto;
  padding:clamp(2.5rem,9vh,5rem) 1.5rem 2rem;
  background:linear-gradient(180deg,#efe8db,#e5dccb);
  border-left:1px solid var(--line);
}

.side h2{
  margin:0;
  font-size:1rem;
  letter-spacing:.22em;
}

.side ul{list-style:none;margin:0;padding:0}

.side a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.4rem 0;
  color:var(--ink);
  text-decoration:none;
  font-size:1rem;
  border-bottom:1px solid var(--line);
  transition:color .25s var(--ease),padding-left .25s var(--ease);
}
.side a:hover{color:var(--clay-d);padding-left:.5rem}

/* 正文 */
main > div:not(.hero){
  counter-increment:seg;
  border-top:1px solid var(--line);
  padding-top:clamp(1.4rem,3.5vh,2.2rem);
  scroll-margin-top:96px;
}

main > div:not(.hero) > h2{
  position:relative;
  padding-left:2.7rem;
  scroll-margin-top:96px;
}

main > div:not(.hero) > h2::before{
  content:counter(seg,decimal-leading-zero);
  position:absolute;
  left:0;
  top:.35em;
  font-family:var(--fm);
  font-size:.85rem;
  letter-spacing:.06em;
  color:var(--clay-d);
}

h2,h3{line-height:1.35;letter-spacing:.03em}

h2{font-size:clamp(1.4rem,2.6vw,1.85rem);margin:0 0 1rem}
h3{font-size:clamp(1.15rem,2vw,1.35rem);margin:2rem 0 1rem;padding-bottom:.4rem;border-bottom:2px solid var(--clay)}

h2 + hr,h3 + hr{
  width:56px;
  height:3px;
  margin:.2rem 0 1.6rem;
  border:0;
  background:var(--clay);
}

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

p{margin:0 0 1.1em}
ul,ol{padding-left:1.3em}
li{margin:.35rem 0}
figure{margin:1.6rem 0}
figcaption{font-size:1rem;color:var(--ink-soft)}
blockquote{
  margin:1.6rem 0;
  padding:.4rem 0 .4rem 1.1rem;
  border-left:3px solid var(--sand);
  color:var(--ink-soft);
}
strong{font-weight:700}
main table{width:100%;border-collapse:collapse;font-size:1rem}
main td,main th{border-bottom:1px solid var(--line);padding:.5rem .4rem;text-align:left}

/* 页脚 */
.foot{
  margin-left:var(--rail);
  padding:clamp(2.2rem,5vw,3.6rem) calc(var(--side) + clamp(1rem,3vw,3rem)) 1.4rem clamp(1rem,4vw,3rem);
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(1.4rem,3vw,2.4rem);
  background:var(--ink);
  color:var(--sand);
}

.foot div{min-width:0}
.foot h3{margin:0;padding:0;border:0;font-size:1rem;letter-spacing:.2em;color:var(--sand)}
.foot hr{width:40px;height:2px;margin:.7rem 0 1rem;background:var(--clay)}
.foot p{margin:0 0 .5rem;font-size:1rem}

.foot ul{list-style:none;margin:0;padding:0}
.foot a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.2rem 0;
  color:var(--sand);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.foot a:hover{color:var(--clay);border-color:var(--clay)}

.f-logo{
  display:flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--fs);
  letter-spacing:.14em;
}

.foot .brand-mark{border-color:var(--clay)}

.f-host{color:rgba(212,196,168,.8);word-break:break-all}

.sub-form{display:flex;flex-direction:column;gap:.55rem}

.sub-form input{
  min-height:44px;
  padding:.5rem .7rem;
  font:inherit;
  font-size:1rem;
  color:var(--sand);
  background:transparent;
  border:1px solid rgba(212,196,168,.45);
  border-radius:0;
}
.sub-form input::placeholder{color:rgba(212,196,168,.62)}

.sub-form button{
  min-height:44px;
  padding:.5rem .8rem;
  font:inherit;
  font-size:1rem;
  letter-spacing:.16em;
  color:var(--ink);
  background:var(--clay);
  border:0;
  border-radius:0;
  cursor:pointer;
}
.sub-form button:hover{background:var(--sand)}

.foot-base{
  grid-column:1 / -1;
  margin-top:clamp(1rem,3vw,2rem);
  padding-top:1rem;
  text-align:center;
  font-size:1rem;
  color:rgba(212,196,168,.78);
  border-top:1px solid rgba(212,196,168,.22);
}
.foot-base p{margin:0}

/* 动效 */
.js .reveal{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
}
.js .reveal.is-in{opacity:1;transform:none}

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

/* 侧栏收进正文 */
@media (max-width:1180px){
  .side{
    position:static;
    width:auto;
    max-width:820px;
    height:auto;
    margin:0 auto;
    order:9;
    overflow:visible;
    background:none;
    border-left:0;
    border-top:1px solid var(--line);
    padding:1.4rem 0 0;
  }
  main{padding-right:clamp(1rem,4vw,3rem)}
  .foot{padding-right:clamp(1rem,4vw,3rem)}
}

/* 窄屏：左侧栏变顶条 */
@media (max-width:860px){
  .rail{
    inset:0 0 auto 0;
    width:auto;
    flex-direction:row;
    align-items:center;
    gap:.8rem;
    padding:.55rem .9rem;
    border-right:0;
    border-bottom:1px solid rgba(212,196,168,.2);
  }
  .brand{flex-direction:row;align-items:center;gap:.5rem;padding:0}
  .brand-name{font-size:1rem;letter-spacing:.12em}
  .menu-btn{width:auto;margin:0 0 0 auto;padding:.45rem .9rem}
  .rail-contact{padding:.4rem 0;min-height:40px}
  .menu{padding-top:5rem}
  .menu ul{grid-template-columns:1fr}
  main{margin-left:0;padding:4.6rem .95rem 3rem;gap:1.6rem}
  main > div:not(.hero) > h2{padding-left:2.3rem}
  .hero{grid-template-columns:1fr;min-height:0}
  .hero-copy h1{font-size:clamp(1.7rem,6vw,2.2rem)}
  .hero-art{aspect-ratio:16/10;min-height:0}
  .hero-mono{min-height:16vh}
  .foot{margin-left:0;grid-template-columns:1fr 1fr;padding:2rem .95rem 1.2rem}
}

@media (max-width:560px){
  .foot{grid-template-columns:1fr}
  .hero-tag{left:.6rem;bottom:.7rem}
}

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