/* ============================================================
   禅 · 站点样式
   纸为底，墨为字，朱砂只用于一处。
   ============================================================ */
:root{
  color-scheme:only light;          /* 拒绝强制深色模式 */
  --paper:#f7f5f0;
  --paper-2:#f2efe8;
  --ink:#1c1b19;
  --ink-2:#4a4741;
  --ink-3:#8a857c;
  --ink-4:#b9b3a7;
  --line:#e2ddd2;
  --seal:#a6392e;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif SC","STSong","SimSun",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%;background:var(--paper);color-scheme:only light}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.9;
  letter-spacing:.02em;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
/* 纸纹：极淡，只做质感 */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:url("../img/paper.jpg") repeat;
  background-size:512px 512px;
  mix-blend-mode:multiply;opacity:.5;
}
body::after{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse 90% 60% at 50% 0%,rgba(255,255,255,.7),transparent 70%);
}
main,header,footer{position:relative;z-index:1}

/* ---------- 通用 ---------- */
.wrap{max-width:1080px;margin:0 auto;padding:0 32px}
.narrow{max-width:720px;margin:0 auto;padding:0 32px}
a{color:inherit;text-decoration:none}
.rule{height:1px;background:var(--line);border:0;margin:0}
.mark{
  font-family:var(--serif);font-size:13px;color:var(--ink-3);
  letter-spacing:.5em;writing-mode:vertical-rl;text-orientation:upright;
}

/* ---------- 顶栏 ---------- */
.top{
  position:fixed;top:0;left:0;right:0;z-index:40;
  padding:22px 32px;display:flex;align-items:center;justify-content:space-between;
  transition:background .5s var(--ease),padding .5s var(--ease),border-color .5s var(--ease);
  border-bottom:1px solid transparent;
}
.top.solid{background:rgba(247,245,240,.86);backdrop-filter:blur(10px);border-bottom-color:var(--line);padding:14px 32px}
.top .name{font-family:var(--serif);font-size:17px;letter-spacing:.22em}
.top nav{display:flex;gap:30px}
.top nav a{font-size:13.5px;color:var(--ink-2);letter-spacing:.14em;position:relative;padding:4px 0}
.top nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;
  background:var(--ink);transition:right .5s var(--ease);
}
.top nav a:hover::after{right:0}

/* ---------- 首屏 ---------- */
.hero{
  min-height:100svh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;
  padding:120px 24px 80px;position:relative;
}
.enso{
  width:min(46vw,330px);height:min(46vw,330px);
  color:var(--ink);position:relative;
}
/* 白色光晕：纸白底上几乎看不见；一旦浏览器把底色压黑，它就成了円相的可见轮廓 */
.enso svg{width:100%;height:100%;display:block;
  filter:drop-shadow(0 1px 0 rgba(0,0,0,.05))
         drop-shadow(0 0 1.4px rgba(255,255,255,.92))
         drop-shadow(0 0 3px rgba(255,255,255,.55))}
/* 落笔：用一条被 dash 动画裁剪的粗描边，扫过实心笔锋轮廓 */
.enso #ensoTrace{
  stroke-dasharray:1;stroke-dashoffset:1;
  animation:enso-draw 2.9s var(--ease) .25s forwards;
}
@keyframes enso-draw{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}

.hero-name{
  font-family:var(--serif);font-size:clamp(28px,5.4vw,42px);letter-spacing:.34em;
  margin:44px 0 0;text-indent:.34em;font-weight:400;
}
.hero-line{
  font-family:var(--serif);font-size:clamp(15px,2.5vw,19px);color:var(--ink-2);
  letter-spacing:.3em;margin:18px 0 0;text-indent:.3em;
}
.hero-meta{
  margin-top:46px;display:flex;align-items:center;gap:22px;
  font-size:12.5px;color:var(--ink-3);letter-spacing:.24em;
}
.hero-meta i{display:block;width:44px;height:1px;background:var(--ink-4)}
.scroll{
  position:absolute;bottom:38px;left:50%;transform:translateX(-50%);
  width:1px;height:64px;background:var(--line);overflow:hidden;
}
.scroll::after{
  content:"";position:absolute;inset:0;background:var(--ink-3);
  animation:drip 2.8s var(--ease) infinite;
}
@keyframes drip{0%{transform:translateY(-100%)}60%,100%{transform:translateY(100%)}}

/* ---------- 段落标题 ---------- */
.sec{padding:clamp(90px,15vh,170px) 0}
.sec-head{display:flex;align-items:center;gap:18px;margin-bottom:64px}
.sec-head .en{font-size:11.5px;letter-spacing:.4em;color:var(--ink-4);text-transform:uppercase}
.sec-head .line{flex:1;height:1px;background:var(--line)}

/* ---------- 门（支持任意数量，共享细线栅格） ---------- */
.gates{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--line);border-left:1px solid var(--line);
}
.gate{
  display:block;padding:50px 38px 46px;position:relative;
  border-right:1px solid var(--line);border-bottom:1px solid var(--line);
  transition:background .7s var(--ease);
}
.gate:hover{background:rgba(255,255,255,.55)}
.gate .num{
  font-family:var(--serif);font-size:15px;color:var(--ink-3);letter-spacing:.2em;
  display:flex;align-items:center;gap:12px;
}
.gate .num i{display:block;width:26px;height:1px;background:var(--ink-4)}
.gate h3{
  font-family:var(--serif);font-size:clamp(22px,3.2vw,29px);font-weight:400;
  margin:26px 0 14px;letter-spacing:.1em;
}
.gate p{color:var(--ink-2);font-size:14.5px;margin:0 0 30px;line-height:1.95;max-width:30em}
.gate .go{
  font-size:13px;color:var(--ink-3);letter-spacing:.2em;display:inline-flex;
  align-items:center;gap:10px;transition:gap .5s var(--ease),color .5s var(--ease);
}
.gate .go::after{content:"";width:26px;height:1px;background:currentColor;transition:width .5s var(--ease)}
.gate:hover .go{color:var(--ink);gap:16px}
.gate:hover .go::after{width:44px}

/* ---------- 一句话 ---------- */
.word{text-align:center;padding:clamp(100px,18vh,200px) 24px}
.word p{
  font-family:var(--serif);font-size:clamp(19px,3.4vw,30px);line-height:2.2;
  color:var(--ink);margin:0;letter-spacing:.14em;font-weight:400;
}
.word .sig{
  display:block;margin-top:40px;font-size:12.5px;color:var(--ink-3);
  letter-spacing:.32em;font-family:var(--sans);
}
.seal{
  display:inline-block;margin-top:46px;padding:9px 12px;
  border:1.5px solid var(--seal);border-radius:3px;color:var(--seal);
  font-family:var(--serif);font-size:15px;letter-spacing:.18em;line-height:1.15;
  writing-mode:vertical-rl;text-orientation:upright;opacity:.9;
}

/* ---------- 迹 ---------- */
.trace{display:grid;grid-template-columns:190px 1fr;gap:40px;align-items:start}
.trace .list{border-top:1px solid var(--line)}
.trace .item{
  display:grid;grid-template-columns:112px 1fr auto;gap:22px;align-items:baseline;
  padding:20px 0;border-bottom:1px solid var(--line);
}
.trace .item .yr{font-size:12.5px;color:var(--ink-3);letter-spacing:.1em;font-variant-numeric:tabular-nums}
.trace .item .co{font-family:var(--serif);font-size:16.5px;letter-spacing:.06em}
.trace .item .ro{font-size:13px;color:var(--ink-3);text-align:right;letter-spacing:.06em}

/* ---------- 页脚 ---------- */
footer{border-top:1px solid var(--line);padding:70px 0 54px;margin-top:40px}
.foot{display:flex;justify-content:space-between;gap:34px;flex-wrap:wrap;align-items:flex-start}
.foot .col{font-size:13px;color:var(--ink-3);line-height:2.1;letter-spacing:.06em}
.foot .col b{display:block;font-family:var(--serif);font-weight:400;font-size:14.5px;
  color:var(--ink-2);letter-spacing:.2em;margin-bottom:12px}
.foot a:hover{color:var(--ink)}
.icp{margin-top:56px;padding-top:26px;border-top:1px solid var(--line);
  font-size:12px;color:var(--ink-4);letter-spacing:.08em;text-align:center}
.icp a{white-space:nowrap}

/* ---------- 显现动画 ----------
   只有 JS 可用时才隐藏（<html class="js">），保证无 JS 也能看到内容 */
.js .rv{opacity:0;transform:translateY(20px);
  transition:opacity 1s var(--ease),transform 1s var(--ease)}
.js .rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  .enso #ensoTrace{animation:none;stroke-dashoffset:0}
  .scroll::after{animation:none}
}

/* 平板：三门改成两列 */
@media(max-width:1040px) and (min-width:761px){
  .gates{grid-template-columns:repeat(2,1fr)}
}

@media(max-height:780px) and (min-width:761px){
  .hero{padding:96px 24px 54px}
  .enso{width:min(30vh,230px);height:min(30vh,230px)}
  .hero-name{margin-top:26px;font-size:clamp(24px,3.6vw,32px)}
  .hero-line{margin-top:12px}
  .hero-meta{margin-top:26px}
  .scroll{height:44px;bottom:22px}
}

/* ---------- 待建入口 ---------- */
.gate.soon{cursor:default}
.gate.soon .go{color:var(--ink-4)}
.gate.soon .go::after{width:14px;background:var(--ink-4)}
.gate.soon:hover{background:transparent}
.gate.soon:hover .go{color:var(--ink-4);gap:10px}
.gate.soon:hover .go::after{width:14px}

/* ---------- 触摸设备：用 :active 代替 :hover ---------- */
@media(hover:none){
  .top nav a::after{display:none}
  .gate:hover{background:transparent}
  .gate:hover .go{color:var(--ink-3);gap:10px}
  .gate:hover .go::after{width:26px}
  .gate:active{background:rgba(255,255,255,.6)}
  .gate:active .go{color:var(--ink)}
  .foot a:active{color:var(--ink)}
}

/* ---------- 手机 ---------- */
@media(max-width:760px){
  .wrap,.narrow{
    padding-left:max(20px,env(safe-area-inset-left));
    padding-right:max(20px,env(safe-area-inset-right));
  }

  /* 顶栏：让可点区域达到 44px（注意 .top 内部没有 .wrap，内边距要直接给 .top） */
  .top{
    padding:8px max(20px, env(safe-area-inset-right)) 8px max(20px, env(safe-area-inset-left));
  }
  .top.solid{
    padding:4px max(20px, env(safe-area-inset-right)) 4px max(20px, env(safe-area-inset-left));
  }
  .top .name{font-size:15px;letter-spacing:.14em;padding:12px 0;display:block}
  .top nav{gap:2px}
  .top nav a{font-size:13px;letter-spacing:.06em;padding:12px 12px;display:block}
  .top nav a:last-child{margin-right:-12px}

  /* 首屏：让円相更有存在感，整体下移一点 */
  .hero{
    min-height:100svh;
    padding:calc(84px + env(safe-area-inset-top)) 20px calc(64px + env(safe-area-inset-bottom));
    justify-content:center;
  }
  .enso{width:min(58vw,290px);height:min(58vw,290px)}
  .hero-name{
    font-size:clamp(23px,7vw,32px);letter-spacing:.16em;text-indent:.16em;
    margin-top:clamp(26px,5vh,40px);
  }
  .hero-line{font-size:clamp(14px,3.9vw,17px);letter-spacing:.22em;text-indent:.22em;margin-top:14px}
  .hero-meta{margin-top:clamp(24px,4.5vh,38px);gap:11px;font-size:11.5px;letter-spacing:.14em}
  .hero-meta i{width:22px}
  .scroll{height:46px;bottom:calc(20px + env(safe-area-inset-bottom))}

  /* 二门：整屏宽、可点区域更大 */
  #gate{padding-top:clamp(48px,7vh,72px);padding-bottom:clamp(48px,7vh,72px)}
  .sec-head{margin-bottom:38px;gap:12px}
  .sec-head .en{font-size:10.5px;letter-spacing:.3em}
  .gates{grid-template-columns:1fr;border-left:0}
  .gate{padding:32px 2px 30px;border-right:0}
  .gate .num{font-size:13.5px;letter-spacing:.16em}
  .gate .num i{width:20px}
  .gate h3{font-size:clamp(21px,5.8vw,26px);margin:18px 0 12px;letter-spacing:.08em}
  .gate p{font-size:14px;line-height:1.9;margin-bottom:22px}
  .gate .go{font-size:12.5px;letter-spacing:.16em;padding:8px 0;gap:9px}
  .gate .go::after{width:22px}

  /* 页脚 */
  footer{padding:52px 0 calc(40px + env(safe-area-inset-bottom));margin-top:24px}
  .foot{flex-direction:column;gap:22px}
  .foot .col{font-size:13.5px;line-height:2}
  .foot .col b{font-size:13.5px;margin-bottom:6px;letter-spacing:.18em}
  .foot a{display:inline-block;padding:4px 0}
  .icp{margin-top:34px;padding-top:20px;font-size:11.5px;letter-spacing:.04em;line-height:1.9}
}

/* ---------- 小屏手机（≤360px）---------- */
@media(max-width:360px){
  .hero-name{font-size:21px;letter-spacing:.12em;text-indent:.12em}
  .hero-line{font-size:13px;letter-spacing:.16em;text-indent:.16em}
  .enso{width:min(54vw,240px);height:min(54vw,240px)}
  .top .name{font-size:14px;letter-spacing:.1em}
  .top nav a{font-size:12.5px;padding:12px 8px}
  .gate h3{font-size:20px}
}

/* ---------- 横屏手机：首屏别太高 ---------- */
@media(max-height:520px) and (orientation:landscape){
  .hero{min-height:auto;padding-top:80px;padding-bottom:40px}
  .enso{width:min(26vh,150px);height:min(26vh,150px)}
  .hero-name{margin-top:18px;font-size:24px}
  .hero-meta{margin-top:16px}
  .scroll{display:none}
}