/* ============================================================
   长乐坊品牌 · 共享样式  /assets/site.css
   新中式数字门坊：奶油纸底 / 深棕黑框架 / 朱砂门楣 / 铜鼓金索引
   ============================================================ */

:root{
  --paper:#F6EEDF;
  --paper-hi:#FFF9EF;
  --ink:#2A211C;
  --cinnabar:#B53A2D;
  --cinnabar-deep:#8C2F27;
  --indigo:#1F3A5F;
  --bronze:#B8862D;
  --jade:#4F7464;
  --line:#D8C8B4;
  --white:#FFFFFF;

  --font-head:"Songti SC","Noto Serif SC","Source Han Serif SC",STSong,SimSun,serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  --font-mono:"SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --wrap:1240px;
  --gutter:clamp(16px,4vw,48px);
  --ease:cubic-bezier(.22,.68,.24,1);
}

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

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

body{
  margin:0;
  background-color:var(--paper);
  background-image:radial-gradient(rgba(42,33,28,.035) 1px,transparent 1px);
  background-size:6px 6px;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,svg{max-width:100%}

h1,h2,h3,h4{
  margin:0 0 .6em;
  font-family:var(--font-head);
  font-weight:700;
  line-height:1.14;
  letter-spacing:.01em;
  color:var(--ink);
}
h1{font-size:clamp(2.4rem,5vw,4.2rem);font-weight:900;line-height:1.03}
h2{font-size:clamp(1.6rem,2.6vw,2.3rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.4rem)}
h4{font-size:1.05rem}

p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.25em}
li{margin:0 0 .35em}
a{color:var(--cinnabar-deep);text-decoration-thickness:1px;text-underline-offset:.18em}
strong{font-weight:700}
small{font-size:.85em}

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

/* ---------- 布局基础 ---------- */
.container{
  width:min(100% - var(--gutter) * 2,var(--wrap));
  margin-inline:auto;
}

.grid{
  display:grid;
  gap:clamp(16px,2.4vw,32px);
}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--4-8{grid-template-columns:4fr 8fr}
.grid--3-9{grid-template-columns:3fr 9fr}

.section{padding-block:clamp(40px,7vw,88px)}
.section--tight{padding-block:clamp(24px,4vw,48px)}

.prose{font-size:clamp(1rem,1.1vw,1.0625rem);line-height:1.85;max-width:34em}
.prose p{margin-bottom:1.15em}
.prose h2,.prose h3{margin-top:1.6em}

.panel{
  background:var(--paper-hi);
  border:1px solid var(--line);
  padding:clamp(18px,2.6vw,32px);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--indigo);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--cinnabar);
  flex:none;
}

.divider{
  height:2px;
  border:0;
  margin:clamp(24px,4vw,48px) 0;
  opacity:.6;
  background:linear-gradient(90deg,
    var(--indigo) 0 12%,transparent 12% 16%,
    var(--indigo) 16% 38%,transparent 38% 42%,
    var(--bronze) 42% 58%,transparent 58% 62%,
    var(--jade) 62% 86%,transparent 86% 90%,
    var(--cinnabar) 90% 100%);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  min-height:44px;
  padding:12px 22px;
  border:1px solid var(--ink);
  border-radius:0;
  background:transparent;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:.86rem;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),transform .24s var(--ease);
}
.btn--solid{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:var(--white);
}
.btn--solid:hover{background:var(--cinnabar-deep);border-color:var(--cinnabar-deep)}
.btn--ghost:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--sm{min-height:44px;padding:9px 16px;font-size:.78rem;letter-spacing:.08em}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  margin:0;
  padding:14px 0;
  border-bottom:1px solid var(--line);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--jade);
}
.breadcrumb__list li{margin:0;display:inline-flex;align-items:center}
.breadcrumb__list li + li::before{content:"/";margin-inline:10px;color:var(--line)}
.breadcrumb a{color:var(--indigo);text-decoration:none}
.breadcrumb a:hover{color:var(--cinnabar);text-decoration:underline}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 图片容器（页面阶段放占位或图片） ---------- */
.img-frame{
  --frame-ratio:4 / 3;
  position:relative;
  display:block;
  margin:0;
  border:1px solid var(--line);
  background:var(--paper-hi);
  overflow:hidden;
}
.img-frame__slot{
  aspect-ratio:var(--frame-ratio);
  display:grid;
  place-items:center;
  padding:16px;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--jade);
  background-image:
    repeating-linear-gradient(45deg,transparent 0 17px,rgba(184,134,45,.16) 17px 18px),
    repeating-linear-gradient(-45deg,transparent 0 17px,rgba(181,58,45,.12) 17px 18px),
    repeating-radial-gradient(circle at 50% 50%,rgba(79,116,100,.12) 0 1px,transparent 1px 9px);
  background-color:var(--paper-hi);
}
.img-frame > img{
  display:block;
  width:100%;
  height:100%;
  aspect-ratio:var(--frame-ratio);
  object-fit:cover;
}
.img-frame__cap{
  display:block;
  padding:9px 14px;
  border-top:1px solid var(--line);
  background:var(--paper);
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.14em;
  color:var(--indigo);
}
.img-frame--wide{--frame-ratio:16 / 9}
.img-frame--tall{--frame-ratio:3 / 4}
.img-frame--square{--frame-ratio:1 / 1}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-80px;
  z-index:300;
  display:inline-block;
  padding:12px 20px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:.85rem;
  font-weight:600;
  letter-spacing:.06em;
  text-decoration:none;
  border:1px solid var(--bronze);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px;color:var(--paper)}

/* ---------- 页头：门楣框架 ---------- */
.site-head{
  position:sticky;
  top:0;
  z-index:120;
  background:var(--paper);
  border-top:4px solid var(--cinnabar);
  border-bottom:1px solid var(--ink);
  --progress:0;
}

.frame-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-2px;
  height:2px;
  pointer-events:none;
  z-index:2;
}
.frame-progress::after{
  content:"";
  display:block;
  height:100%;
  background:var(--bronze);
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  transition:transform .1s linear;
}

.site-head__frame{
  position:relative;
  display:flex;
  align-items:stretch;
  gap:0;
  min-height:78px;
  padding-inline:var(--gutter);
}

.site-head__brand{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  flex:none;
  padding:12px clamp(12px,2vw,26px) 12px 0;
  border-right:1px solid var(--ink);
  margin-right:clamp(10px,1.6vw,22px);
}

.brand-lockup{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--ink);
  text-decoration:none;
}
.brand-lockup__seal{
  flex:none;
  width:34px;
  height:34px;
  display:grid;
  place-items:center;
  background:var(--cinnabar);
  color:var(--white);
  font-family:var(--font-head);
  font-size:1.1rem;
  font-weight:900;
  line-height:1;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.4);
}
.brand-lockup__text{display:block;min-width:0}
.brand-lockup__cn{
  display:block;
  font-family:var(--font-head);
  font-weight:900;
  font-size:1.04rem;
  letter-spacing:.1em;
  line-height:1.15;
  color:var(--ink);
  white-space:nowrap;
}
.brand-lockup__en{
  display:block;
  font-family:var(--font-mono);
  font-size:.58rem;
  letter-spacing:.22em;
  line-height:1.4;
  color:var(--indigo);
  white-space:nowrap;
}

.brand-line{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.14em;
  color:var(--jade);
  white-space:nowrap;
}
.version-badge{
  display:inline-block;
  padding:1px 6px;
  border:1px solid var(--bronze);
  color:var(--bronze);
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.1em;
  line-height:1.5;
}

/* 导航 */
.site-nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(10px,1.7vw,26px);
  flex:1 1 auto;
  min-width:0;
  padding-left:clamp(8px,1.4vw,20px);
}

.nav-list{
  display:flex;
  align-items:center;
  flex-wrap:nowrap;
  gap:clamp(0,.5vw,8px);
  margin:0;
  padding:0;
  list-style:none;
  min-width:0;
}
.nav-list li{margin:0}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:44px;
  padding:10px clamp(5px,.75vw,10px);
  color:var(--ink);
  font-size:.82rem;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.3;
  text-decoration:none;
  white-space:nowrap;
  transition:color .24s var(--ease),background-color .24s var(--ease);
}
.nav-link__idx{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.1em;
  color:var(--bronze);
  transition:color .24s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:clamp(5px,.75vw,10px);
  right:clamp(5px,.75vw,10px);
  bottom:7px;
  height:2px;
  background:var(--cinnabar);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease);
}
.nav-link:hover{color:var(--cinnabar-deep);background:rgba(184,134,45,.09)}
.nav-link:hover::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cinnabar-deep)}
.nav-link[aria-current="page"] .nav-link__idx{color:var(--cinnabar)}

.nav-tail{
  display:flex;
  align-items:center;
  gap:12px;
  flex:none;
  padding-left:clamp(8px,1.4vw,20px);
  border-left:1px solid var(--line);
}
.nav-tail__label{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.2em;
  color:var(--jade);
  white-space:nowrap;
}

/* 移动切换按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:44px;
  min-width:44px;
  margin-left:12px;
  align-self:center;
  padding:8px 13px;
  background:transparent;
  border:1px solid var(--ink);
  border-radius:0;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:.78rem;
  font-weight:600;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background-color .24s var(--ease),color .24s var(--ease);
}
.nav-toggle:hover{background:var(--ink);color:var(--paper)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:currentColor;
  flex:none;
  transition:background-color .24s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform .28s var(--ease),top .28s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

/* ---------- 页脚 ---------- */
.site-foot{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink);
  color:var(--paper);
  isolation:isolate;
}
.site-foot::before{
  content:"";
  display:block;
  height:10px;
  background-color:var(--cinnabar-deep);
  background-image:repeating-linear-gradient(90deg,transparent 0 9px,var(--bronze) 9px 11px);
}

.site-foot__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.9fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(32px,5vw,58px) clamp(24px,3.5vw,40px);
  border-bottom:1px solid rgba(246,238,223,.22);
}

.site-foot__lead{min-width:0}

.foot-brand{
  margin:0 0 8px;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.35rem,2.4vw,1.85rem);
  line-height:1.2;
  letter-spacing:.04em;
  color:var(--paper);
}
.foot-en{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.2em;
  color:var(--bronze);
}
.foot-tag{
  margin:0 0 22px;
  max-width:22em;
  font-size:.9rem;
  line-height:1.75;
  color:rgba(246,238,223,.78);
}

.site-foot .btn--ghost{
  border-color:rgba(246,238,223,.45);
  color:var(--paper);
}
.site-foot .btn--ghost:hover{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:var(--white);
}

.site-foot__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
  min-width:0;
}

.foot-block{min-width:0}
.foot-title{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px;
  margin:0 0 14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(246,238,223,.22);
  font-family:var(--font-head);
  font-size:1rem;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--paper);
}
.foot-title span{
  font-family:var(--font-mono);
  font-size:.58rem;
  font-weight:400;
  letter-spacing:.2em;
  color:var(--bronze);
}

.foot-list{
  margin:0;
  padding:0;
  list-style:none;
  font-size:.86rem;
  line-height:1.7;
}
.foot-list li{margin:0 0 2px}
.foot-list a{
  display:inline-block;
  min-height:34px;
  padding:5px 0;
  color:rgba(246,238,223,.86);
  text-decoration:none;
  transition:color .22s var(--ease);
}
.foot-list a:hover{color:var(--bronze);text-decoration:underline;text-underline-offset:.2em}
.foot-list--plain li{
  padding:5px 0;
  color:rgba(246,238,223,.74);
  font-size:.82rem;
  line-height:1.7;
  overflow-wrap:anywhere;
}

.foot-note{
  margin:12px 0 0;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.06em;
  line-height:1.8;
  color:rgba(246,238,223,.55);
}

.site-foot__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:18px 26px;
}
.foot-copy,
.foot-icp{
  margin:0;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.12em;
  color:rgba(246,238,223,.6);
}
.foot-copy span{color:rgba(246,238,223,.85)}

/* ---------- 动效：滚动显现 ---------- */
.is-js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.is-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 平板 / 移动 ---------- */
@media (max-width:1120px){
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:130;
    display:none;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:10px var(--gutter) 22px;
    background:var(--paper-hi);
    border-top:1px solid var(--ink);
    border-bottom:1px solid var(--ink);
    box-shadow:0 20px 44px rgba(42,33,28,.16);
    max-height:calc(100vh - 96px);
    max-height:calc(100dvh - 96px);
    overflow-y:auto;
    padding-left:var(--gutter);
  }
  .site-nav[data-open]{display:flex}

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
  }
  .nav-list li{border-bottom:1px solid var(--line)}
  .nav-link{
    display:flex;
    justify-content:flex-start;
    width:100%;
    min-height:48px;
    padding:14px 2px;
    font-size:.95rem;
  }
  .nav-link::after{left:0;right:0;bottom:0;height:2px}
  .nav-link:hover{background:rgba(184,134,45,.1)}

  .nav-tail{
    flex-direction:column;
    align-items:flex-start;
    gap:12px;
    margin-top:14px;
    padding:16px 0 4px;
    border-left:0;
    border-top:1px solid var(--line);
    width:100%;
  }
  .nav-tail .btn{width:100%}
}

@media (max-width:900px){
  .grid--5-7,
  .grid--4-8,
  .grid--3-9{grid-template-columns:1fr}

  .site-foot__inner{grid-template-columns:1fr}
  .site-foot__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:680px){
  .site-head__frame{min-height:66px}
  .site-head__brand{
    padding:9px 12px 9px 0;
    margin-right:8px;
  }
  .brand-lockup__seal{width:30px;height:30px;font-size:1rem}
  .brand-lockup__cn{font-size:.94rem;letter-spacing:.06em}
  .brand-lockup__en{font-size:.52rem;letter-spacing:.16em}
  .brand-line{font-size:.56rem;letter-spacing:.08em;gap:6px}
  .version-badge{font-size:.54rem;padding:0 5px}
  .nav-toggle{padding:8px 10px;font-size:.72rem;gap:7px}

  .site-foot__cols{grid-template-columns:1fr;gap:26px}
  .site-foot__base{flex-direction:column;align-items:flex-start}
  .foot-list a{min-height:44px;display:flex;align-items:center}
}

@media (max-width:400px){
  .brand-lockup__en{display:none}
  .brand-line span:first-child{display:none}
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .is-js [data-reveal]{opacity:1;transform:none}
  .frame-progress::after{transition:none}
}