/* ============================================================
   问鼎苹果会馆 · /assets/site.css
   暖纸为底 · 深墨为字 · 鎏金为序 · 苹果红为门
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}

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

body,
h1,h2,h3,h4,h5,h6,
p,ul,ol,li,figure,blockquote,dl,dd{margin:0}

ul,ol{padding:0;list-style:none}

img,svg,video{display:block;max-width:100%}

button{
  font:inherit;
  color:inherit;
  background:none;
  border:0;
  padding:0;
  cursor:pointer;
}

a{color:inherit}

/* ---------- 2. 变量 ---------- */
:root{
  --c-red:#8E1F2B;
  --c-red-deep:#5E121B;
  --c-ink:#171514;
  --c-paper:#F6F0E4;
  --c-cream:#FFF9EF;
  --c-gold:#B88A44;
  --c-gold-light:#E3C98F;
  --c-celadon:#3E6B5A;
  --c-celadon-light:#DCE8E1;
  --c-warm-gray:#8B8178;
  --c-paper-line:#E9E1D2;

  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",serif;
  --font-body:"PingFang SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","SF Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --max:1180px;
  --gutter:clamp(1.15rem,4.2vw,3.25rem);
  --header-h:clamp(64px,7vw,84px);
  --sp-section:clamp(3.25rem,8vw,6.5rem);
  --ease:cubic-bezier(.22,.68,.24,1);
}

/* ---------- 3. 中文排版基底 ---------- */
body{
  min-height:100%;
  background-color:var(--c-paper);
  background-image:repeating-linear-gradient(
    0deg,
    rgba(184,138,68,.045) 0 1px,
    rgba(184,138,68,0) 1px 104px
  );
  color:var(--c-ink);
  font-family:var(--font-body);
  font-size:clamp(.9375rem,.9rem + .18vw,1.0625rem);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.24;
  letter-spacing:.02em;
}

p{max-width:42em}

:focus-visible{
  outline:2px solid var(--c-red);
  outline-offset:3px;
  border-radius:1px;
}

.site-footer :focus-visible{outline-color:var(--c-gold-light)}

::selection{background:var(--c-red);color:var(--c-cream)}

/* ---------- 4. 布局容器 ---------- */
.container{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-block:var(--sp-section)}

.section--tight{padding-block:clamp(2rem,5vw,3.5rem)}

.grid-split{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(1.5rem,4vw,3.5rem);
}

@media (min-width:900px){
  .grid-split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
  .grid-split--reverse{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
}

/* ---------- 5. 文字组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-gold);
}

.eyebrow::before{
  content:"";
  width:clamp(18px,4vw,44px);
  height:1px;
  background:currentColor;
  flex:0 0 auto;
}

.prose{max-width:40em;line-height:1.85;color:var(--c-ink)}
.prose p + p{margin-top:1.05em}

.mono-figure{
  font-family:var(--font-mono);
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
}

.rule-line{
  height:1px;
  border:0;
  background:var(--c-paper-line);
}

/* 序号章节 */
.chapter{display:grid;gap:.6rem}
.chapter-index{
  font-family:var(--font-mono);
  font-size:clamp(1.75rem,4vw,2.75rem);
  font-weight:500;
  line-height:1;
  letter-spacing:.08em;
  color:var(--c-gold);
  font-variant-numeric:tabular-nums;
}
.chapter-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.5rem,3.4vw,2.4rem);
  line-height:1.28;
  color:var(--c-ink);
}
.chapter-note{
  max-width:32rem;
  font-size:.875rem;
  line-height:1.85;
  color:var(--c-warm-gray);
}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.2rem .6rem;
  border-radius:2px;
  background:var(--c-gold-light);
  color:var(--c-ink);
  font-size:.75rem;
  letter-spacing:.1em;
  line-height:1.6;
}
.tag--celadon{background:var(--c-celadon);color:#F4FBF7}
.tag--celadon-soft{background:var(--c-celadon-light);color:var(--c-celadon)}
.tag--gold{background:transparent;border:1px solid var(--c-gold);color:var(--c-gold)}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.7rem 1.25rem;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:.875rem;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.4;
  text-decoration:none;
  transition:background-color .22s var(--ease),color .22s var(--ease),
             border-color .22s var(--ease),transform .22s var(--ease);
}
.btn--gate{
  background:var(--c-red);
  color:var(--c-cream);
  box-shadow:inset 0 0 0 1px rgba(227,201,143,.55);
}
.btn--gate:hover{background:var(--c-red-deep);transform:translateY(-1px)}
.btn--gate:active{transform:translateY(0)}
.btn--line{
  background:transparent;
  border-color:var(--c-red);
  color:var(--c-red);
}
.btn--line:hover{background:var(--c-red);color:var(--c-cream);border-color:var(--c-red)}

/* 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  padding-block:clamp(.9rem,3vw,1.6rem);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:var(--c-warm-gray);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
}
.breadcrumb li{display:flex;align-items:center;gap:.5rem}
.breadcrumb li + li::before{
  content:"／";
  color:var(--c-gold);
  font-size:.75rem;
}
.breadcrumb a{
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.breadcrumb a:hover{color:var(--c-ink);border-bottom-color:var(--c-gold)}

/* ---------- 6. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  background:var(--c-paper-line);
  border-radius:2px;
  aspect-ratio:4 / 3;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  box-shadow:inset 0 0 0 1px rgba(23,21,20,.08);
  pointer-events:none;
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__caption{
  margin-top:.7rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:var(--c-warm-gray);
}

/* ---------- 7. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:.6rem;
  left:50%;
  z-index:200;
  transform:translate(-50%,-180%);
  padding:.65rem 1.3rem;
  border-radius:2px;
  background:var(--c-red);
  color:var(--c-cream);
  font-size:.8125rem;
  letter-spacing:.14em;
  text-decoration:none;
  transition:transform .24s var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0)}

/* ---------- 8. 门庭页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background-color:transparent;
  color:var(--c-ink);
  transition:background-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:1px;
  background:linear-gradient(
    90deg,
    rgba(184,138,68,0) 0%,
    rgba(184,138,68,.75) 18%,
    rgba(184,138,68,.75) 82%,
    rgba(184,138,68,0) 100%
  );
  pointer-events:none;
}
.site-header[data-scrolled],
.site-header[data-open]{
  background-color:rgba(246,240,228,.97);
  box-shadow:0 12px 28px -24px rgba(23,21,20,.65);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}

.site-header__inner{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:clamp(.75rem,2.4vw,2rem);
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  flex:0 0 auto;
  text-decoration:none;
  color:inherit;
}
.brand-mark{
  position:relative;
  display:block;
  width:34px;
  height:34px;
  flex:0 0 auto;
  transition:transform .5s var(--ease);
}
.brand-mark::before{
  content:"";
  position:absolute;
  inset:0;
  border:2px solid var(--c-red);
  border-bottom-width:0;
  border-radius:2px 2px 0 0;
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:8px;
  top:7px;
  width:calc(100% - 16px);
  height:calc(100% - 9px);
  background:linear-gradient(
    90deg,
    var(--c-gold) 0 2px,
    rgba(184,138,68,0) 2px calc(100% - 2px),
    var(--c-gold) calc(100% - 2px) 100%
  );
}
.brand:hover .brand-mark{transform:rotate(-5deg)}

.brand-text{display:flex;flex-direction:column;gap:.1rem}
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.02rem,1.5vw,1.28rem);
  letter-spacing:.08em;
  line-height:1.2;
  color:var(--c-ink);
}
.brand-tagline{
  font-size:.625rem;
  letter-spacing:.3em;
  line-height:1.4;
  color:var(--c-gold);
}

/* 主导航 */
.site-nav{margin-left:auto}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(.85rem,2.1vw,1.85rem);
}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.34rem;
  padding:.55rem 0;
  color:inherit;
  font-size:.9375rem;
  line-height:1.4;
  text-decoration:none;
  transition:color .22s var(--ease);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.08em;
  color:var(--c-gold);
  font-variant-numeric:tabular-nums;
  transition:color .22s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:.12rem;
  height:1px;
  background:var(--c-red);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--c-red)}
.nav-link:hover .nav-index{color:var(--c-red)}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1)}

.nav-link[aria-current="page"]{color:var(--c-red);font-weight:600}
.nav-link[aria-current="page"] .nav-index{color:var(--c-red)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-gold)}

/* 头部操作区 */
.header-actions{
  display:flex;
  align-items:center;
  gap:.6rem;
  flex:0 0 auto;
  margin-left:clamp(.5rem,1.8vw,1.4rem);
}
.header-cta{
  padding:.58rem 1.05rem;
  font-size:.8125rem;
  letter-spacing:.14em;
  white-space:nowrap;
}

/* 移动端目录按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .55rem;
  border:1px solid var(--c-paper-line);
  border-radius:2px;
  color:var(--c-ink);
  transition:border-color .22s var(--ease),background-color .22s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-gold);background:var(--c-cream)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:12px;
  flex:0 0 auto;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform .26s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{
  font-size:.75rem;
  letter-spacing:.18em;
  line-height:1;
}

/* 阅读进度 */
.reading-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.reading-progress__bar{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--c-red),var(--c-gold));
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  transition:transform .12s linear;
}

/* 页头响应式 */
@media (max-width:1024px){
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    margin:0;
    padding:.3rem var(--gutter) 1.4rem;
    background-color:var(--c-cream);
    border-top:1px solid var(--c-paper-line);
    box-shadow:0 26px 44px -30px rgba(23,21,20,.6);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-header[data-open] .site-nav{display:block}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-item + .nav-item{border-top:1px solid var(--c-paper-line)}
  .nav-link{
    display:flex;
    width:100%;
    padding:.95rem 0;
    font-size:1.0625rem;
  }
  .nav-link::after{display:none}
  .nav-index{font-size:.75rem}
  .header-actions{margin-left:auto}
  .nav-toggle{display:inline-flex}
}

@media (max-width:600px){
  .brand-name{font-size:1rem}
  .brand-tagline{display:none}
  .brand-mark{width:28px;height:28px}
  .brand-mark::after{left:6px;top:6px;width:calc(100% - 12px);height:calc(100% - 8px)}
  .header-cta{padding:.5rem .7rem;font-size:.75rem;letter-spacing:.06em}
  .nav-toggle__text{display:none}
  .nav-toggle{padding:.5rem .45rem}
}

/* ---------- 9. 会馆页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  background-color:var(--c-red-deep);
  color:#EFE3D2;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:linear-gradient(
    90deg,
    var(--c-gold) 0 22%,
    rgba(227,201,143,.32) 22% 100%
  );
}

.site-footer__inner{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding:clamp(2.5rem,6vw,4.25rem) var(--gutter) clamp(1.75rem,4vw,2.75rem);
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(2rem,5vw,3.5rem);
}
@media (min-width:880px){
  .site-footer__inner{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
}

.footer-brand{display:block}
.footer-mark{
  position:relative;
  display:block;
  width:38px;
  height:38px;
  margin-bottom:1rem;
}
.footer-mark::before{
  content:"";
  position:absolute;
  inset:0;
  border:2px solid var(--c-gold);
  border-bottom-width:0;
  border-radius:2px 2px 0 0;
}
.footer-mark::after{
  content:"";
  position:absolute;
  left:9px;
  top:7px;
  width:calc(100% - 18px);
  height:calc(100% - 9px);
  background:linear-gradient(
    90deg,
    var(--c-gold-light) 0 2px,
    rgba(227,201,143,0) 2px calc(100% - 2px),
    var(--c-gold-light) calc(100% - 2px) 100%
  );
}
.footer-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.45rem,3vw,2rem);
  letter-spacing:.1em;
  line-height:1.3;
  color:#FBF3E6;
  max-width:none;
}
.footer-tagline{
  margin-top:.4rem;
  font-size:.6875rem;
  letter-spacing:.3em;
  color:var(--c-gold-light);
  max-width:none;
}
.footer-note{
  margin-top:1.15rem;
  padding-top:1rem;
  border-top:1px solid rgba(227,201,143,.22);
  max-width:30rem;
  font-size:.8125rem;
  line-height:1.9;
  color:rgba(239,227,210,.72);
}

.footer-columns{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(1.75rem,5vw,3rem);
}
@media (min-width:560px){
  .footer-columns{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
}

.footer-col__title{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin-bottom:1.05rem;
  font-family:var(--font-body);
  font-size:.8125rem;
  font-weight:600;
  letter-spacing:.22em;
  color:var(--c-gold-light);
}
.footer-col__index{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:1.5rem;
  padding:.1rem .3rem;
  border:1px solid rgba(227,201,143,.42);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--c-gold);
}

.footer-links{display:grid;gap:.6rem}
.footer-links a{
  position:relative;
  display:inline-block;
  padding-left:1.15rem;
  font-size:.9375rem;
  color:rgba(239,227,210,.9);
  text-decoration:none;
  transition:color .22s var(--ease);
}
.footer-links a::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:.6rem;
  height:1px;
  background:var(--c-gold);
  opacity:.65;
  transition:width .24s var(--ease),opacity .24s var(--ease);
}
.footer-links a:hover{color:var(--c-gold-light)}
.footer-links a:hover::before{width:1rem;opacity:1}

.footer-contact{display:grid;gap:.95rem}
.contact-item{display:grid;gap:.12rem}
.contact-label{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.2em;
  color:var(--c-gold);
}
.contact-value{
  font-size:.9375rem;
  line-height:1.7;
  color:rgba(239,227,210,.9);
  word-break:break-word;
  font-variant-numeric:tabular-nums;
}

.site-footer__bottom{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding:1.1rem var(--gutter) 1.75rem;
  border-top:1px solid rgba(227,201,143,.22);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.4rem 1.5rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:rgba(239,227,210,.62);
}
.footer-copy{max-width:none}
.footer-icp{
  max-width:none;
  color:rgba(227,201,143,.8);
}

/* ---------- 10. 动效克制 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .brand:hover .brand-mark{transform:none}
  .reading-progress__bar{transition:none}
}