/* ==========================================================================
   易发老版 · 共享样式表 /assets/site.css
   书脊式框架导航 + 旧纸画布 + 章节编号轴式排版
   ========================================================================== */

/* ---------- 0. 变量 ---------- */
:root{
  --deep:#0F2E24;
  --deep-2:#0A231B;
  --paper:#E8D9A8;
  --paper-deep:#DCCB94;
  --cyanpaper:#D7F0EA;
  --ink:#12130F;
  --cyan:#27E0C8;
  --cyan-ink:#0C6B60;
  --orange:#F08A3C;
  --wine:#6E1E2B;
  --indigo:#2B1E4A;
  --mist:#A8B5A0;
  --mist-ink:#5F6B58;
  --gold:#B98A2E;
  --font-display:"Noto Serif SC","Songti SC","FangSong","STSong",Georgia,serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --spine:246px;
  --edge:clamp(16px,3.2vw,42px);
  --r-lg:28px;
  --r-md:18px;
  --r-pill:999px;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scrollbar-color:var(--gold) var(--deep);
}

body,
h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{ margin:0; }
ul,ol{ padding:0; list-style:none; }
img,svg,video{ max-width:100%; height:auto; display:block; }
button{ font:inherit; color:inherit; background:none; border:0; cursor:pointer; }
a{ color:inherit; }
table{ border-collapse:collapse; width:100%; }
summary{ cursor:pointer; }
[hidden]{ display:none !important; }

/* ---------- 2. 页面基底 ---------- */
body{
  background-color:var(--paper);
  background-image:
    linear-gradient(180deg, rgba(185,138,46,.13), rgba(185,138,46,0) 340px),
    repeating-linear-gradient(90deg, rgba(18,19,15,.026) 0 1px, transparent 1px 5px);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.005em;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:.01em;
  line-height:1.28;
}

:where(a,button,summary,input,textarea,select,[tabindex]):focus-visible{
  outline:3px solid var(--cyan);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- 3. 跳过链接 ---------- */
.skip-link{
  position:absolute;
  top:-70px;
  left:14px;
  z-index:200;
  padding:10px 18px;
  border-radius:0 0 14px 14px;
  background:var(--orange);
  color:var(--ink);
  font-family:var(--font-display);
  font-weight:700;
  text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus{ top:0; }

/* ---------- 4. 头部 / 书脊导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background-color:var(--deep);
  background-image:radial-gradient(420px 180px at 100% 0%, rgba(43,30,74,.75), transparent 72%);
  color:var(--paper);
  border-bottom:3px solid var(--gold);
}

.spine{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:10px 14px;
  padding:12px var(--edge);
  box-sizing:border-box;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--paper);
  min-width:0;
}
.brand__mark{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  border-radius:13px;
  background:linear-gradient(140deg,var(--orange),var(--wine));
  color:var(--paper);
  font-family:var(--font-display);
  font-weight:900;
  font-size:21px;
  box-shadow:inset 0 0 0 2px rgba(18,19,15,.28);
}
.brand__text{ display:flex; flex-direction:column; line-height:1.12; min-width:0; }
.brand__line{
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  letter-spacing:.05em;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--cyan);
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 15px;
  border:1.5px solid rgba(232,217,168,.45);
  border-radius:var(--r-pill);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.12em;
}
.nav-toggle:hover{ border-color:var(--cyan); color:var(--cyan); }
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  border-radius:2px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:currentColor;
  border-radius:2px;
  transition:transform .2s ease;
}
.nav-toggle__bars::before{ top:-5px; }
.nav-toggle__bars::after{ top:5px; }
.site-header[data-open] .nav-toggle__bars{ background:transparent; }
.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); }

.spine__tagline{ display:none; }
.spine__meta{ display:none; }

.nav{
  grid-column:1 / -1;
  max-height:0;
  opacity:0;
  visibility:hidden;
  overflow:hidden;
  transition:max-height .3s ease, opacity .22s ease;
}
.site-header[data-open] .nav{
  max-height:72vh;
  opacity:1;
  visibility:visible;
  overflow-y:auto;
  padding-top:8px;
  border-top:1px solid rgba(232,217,168,.18);
}

.nav__list{ display:flex; flex-direction:column; gap:2px; }
.nav__item{ display:block; }
.nav__link{
  display:flex;
  align-items:baseline;
  gap:11px;
  padding:12px 10px;
  border-radius:14px;
  border:1px solid transparent;
  color:rgba(232,217,168,.84);
  font-size:16px;
  text-decoration:none;
  transition:background .18s ease, color .18s ease, border-color .18s ease;
}
.nav__num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--gold);
}
.nav__label{ font-family:var(--font-body); }
.nav__link:hover{
  background:rgba(232,217,168,.1);
  color:var(--paper);
}
.nav__link[aria-current="page"]{
  background:rgba(39,224,200,.14);
  border-color:rgba(39,224,200,.5);
  color:var(--cyan);
}
.nav__link[aria-current="page"] .nav__num{ color:var(--cyan); }

.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:var(--p,0%);
  height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  pointer-events:none;
}

/* ---------- 5. 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(34px,5vw,68px) 0 26px;
  background-color:var(--deep);
  background-image:
    radial-gradient(620px 240px at 10% 0%, rgba(43,30,74,.85), transparent 70%),
    radial-gradient(540px 260px at 94% 104%, rgba(110,30,43,.62), transparent 72%);
  color:var(--cyanpaper);
  border-top:3px solid var(--orange);
}
.foot__wrap{
  width:min(1160px, 100% - var(--edge) * 2);
  margin-inline:auto;
}
.foot__head{ max-width:62ch; }
.foot__chapter{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.32em;
  color:var(--gold);
  margin-bottom:10px;
}
.foot__title{
  font-family:var(--font-display);
  font-size:clamp(20px,2.6vw,27px);
  font-weight:800;
  color:var(--paper);
  margin-bottom:12px;
}
.foot__note{
  font-size:15px;
  line-height:1.75;
  color:rgba(215,240,234,.78);
}
.foot__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(22px,3vw,40px);
  margin-top:clamp(26px,4vw,44px);
}
.foot__col{ min-width:0; }
.foot__coltitle{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--cyan);
  margin-bottom:14px;
}
.foot__list{ display:flex; flex-direction:column; gap:9px; }
.foot__list--plain{ gap:7px; }
.foot__item{ min-width:0; }
.foot__link{
  color:rgba(232,217,168,.86);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease, border-color .18s ease;
}
.foot__link:hover{ color:var(--cyan); border-bottom-color:var(--cyan); }
.foot__text{
  display:block;
  font-size:15px;
  line-height:1.7;
  color:rgba(215,240,234,.74);
  overflow-wrap:anywhere;
}
.foot__legal{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 22px;
  margin-top:clamp(28px,4vw,46px);
  padding-top:18px;
  border-top:1px dashed rgba(185,138,46,.6);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:rgba(215,240,234,.66);
}
.foot__icp,
.foot__copy{ margin:0; }

/* ---------- 6. 通用排版组件 ---------- */
.wrap{
  width:min(1160px, 100% - var(--edge) * 2);
  margin-inline:auto;
}
.main{ display:block; min-width:0; }
.section{ margin-block:clamp(28px,4.5vw,64px); }
.section:first-child{ margin-top:clamp(20px,3vw,40px); }

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--wine);
  margin-bottom:10px;
}
.eyebrow--light{ color:var(--cyan); }

.chapter-no{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(48px,9vw,120px);
  line-height:.85;
  letter-spacing:-.04em;
  color:var(--orange);
  opacity:.92;
}

.lede{
  font-size:clamp(17px,1.4vw,20px);
  line-height:1.72;
  color:rgba(18,19,15,.88);
  max-width:64ch;
}

.note{
  font-size:13px;
  line-height:1.65;
  color:var(--mist-ink);
}
.note--light{ color:var(--mist); }

.rule{
  height:2px;
  border:0;
  margin-block:clamp(22px,4vw,44px);
  background:repeating-linear-gradient(90deg,var(--gold) 0 14px, transparent 14px 28px);
  opacity:.7;
}

.main a:not([class]){
  color:var(--wine);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}
.main a:not([class]):hover{ color:var(--orange); }

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 24px;
  border:2px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-display);
  font-size:16px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  transition:background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover{ transform:translateY(-2px); }
.btn--solid{
  background:var(--orange);
  border-color:var(--orange);
  color:var(--ink);
}
.btn--solid:hover{ background:var(--paper); border-color:var(--paper); color:var(--ink); }
.btn--line{
  background:transparent;
  border-color:var(--gold);
  color:var(--paper);
}
.btn--line:hover{ background:rgba(0,0,0,.18); border-color:var(--cyan); color:var(--cyan); }
.btn--ghost{
  background:transparent;
  border-color:rgba(18,19,15,.4);
  color:var(--ink);
}
.btn--ghost:hover{ background:var(--deep); border-color:var(--deep); color:var(--cyanpaper); }

/* ---------- 8. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 13px;
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  border:1.5px solid transparent;
  white-space:nowrap;
}
.tag--wine{ background:var(--wine); border-color:var(--wine); color:var(--cyanpaper); }
.tag--indigo{ background:var(--indigo); border-color:var(--indigo); color:var(--cyanpaper); }
.tag--gold{
  background:rgba(185,138,46,.22);
  border-color:var(--gold);
  color:#6B4A0E;
}

/* ---------- 9. 面板 ---------- */
.panel{
  border-radius:var(--r-lg);
  padding:clamp(20px,3vw,34px);
  background:var(--cyanpaper);
  color:var(--ink);
}
.panel--ink{ background:var(--deep); color:var(--paper); }
.panel--ink .note{ color:var(--mist); }
.panel--wine{ background:var(--wine); color:var(--cyanpaper); }
.panel--wine .note{ color:rgba(215,240,234,.8); }
.panel--indigo{ background:var(--indigo); color:var(--cyanpaper); }
.panel--indigo .note{ color:rgba(215,240,234,.78); }
.panel--echo{
  background:rgba(232,217,168,.55);
  border:2px dashed rgba(185,138,46,.55);
  color:var(--ink);
}

/* ---------- 10. 网格 ---------- */
.grid{ display:grid; gap:clamp(16px,2.4vw,28px); }
.grid--2{ grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); }
.grid--3{ grid-template-columns:repeat(auto-fit,minmax(236px,1fr)); }
.grid--4{ grid-template-columns:repeat(auto-fit,minmax(190px,1fr)); }

/* ---------- 11. 索引条 ---------- */
.index-strip{ display:flex; flex-direction:column; gap:6px; }
.index-strip__row{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:12px;
  padding:12px 18px;
  border-radius:var(--r-pill);
  border-left:4px solid var(--gold);
  background:rgba(215,240,234,.74);
  color:var(--ink);
  text-decoration:none;
  transition:background .18s ease, border-color .18s ease, transform .18s ease;
}
.index-strip__row:hover{
  background:rgba(39,224,200,.26);
  border-left-color:var(--orange);
  transform:translateX(4px);
}
.index-strip__no{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--wine);
}
.index-strip__label{
  font-family:var(--font-display);
  font-weight:700;
  font-size:16px;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.index-strip__meta{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--mist-ink);
}

/* ---------- 12. 图像容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  border-radius:var(--r-md);
  border:2px solid rgba(185,138,46,.55);
  background:linear-gradient(150deg,var(--deep),var(--indigo));
  color:var(--cyanpaper);
}
.media-frame__img,
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame__cap{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:10px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--cyanpaper);
  background:linear-gradient(transparent, rgba(15,46,36,.92));
}
.media-frame--cut{
  border-radius:var(--r-lg);
  clip-path:polygon(0 0, 100% 0, 100% 86%, 0 100%);
}
.media-frame--tall{ aspect-ratio:3 / 4; }
.media-frame:empty::after{
  content:"图样位";
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.3em;
  color:rgba(215,240,234,.6);
}

/* ---------- 13. 面包屑 ---------- */
.crumbs{ font-family:var(--font-mono); font-size:12.5px; letter-spacing:.08em; }
.crumbs__list{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.crumbs__item{
  display:flex;
  align-items:center;
  gap:8px;
  color:var(--mist-ink);
}
.crumbs__item + .crumbs__item::before{
  content:"/";
  color:var(--gold);
}
.crumbs__link{
  color:var(--deep);
  text-decoration:none;
  border-bottom:1px solid rgba(15,46,36,.3);
}
.crumbs__link:hover{ color:var(--orange); border-bottom-color:var(--orange); }

/* ---------- 14. 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease, transform .5s ease;
}
[data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 15. 平板及以上 ---------- */
@media (min-width:640px){
  .foot__grid{ grid-template-columns:repeat(2,minmax(0,1fr)); }
}

@media (min-width:1024px){
  body{ padding-left:var(--spine); }

  .site-header{
    position:fixed;
    inset-block:0;
    inset-inline-start:0;
    width:var(--spine);
    border-bottom:0;
    border-right:3px solid var(--gold);
    overflow:hidden;
  }
  .site-header::after{
    content:"";
    position:absolute;
    top:14px;
    bottom:14px;
    right:9px;
    width:2px;
    background:repeating-linear-gradient(180deg,var(--gold) 0 10px, transparent 10px 22px);
    opacity:.45;
    pointer-events:none;
  }
  .spine{
    grid-template-columns:1fr;
    align-content:start;
    gap:16px;
    height:100%;
    padding:28px 22px 24px;
    overflow-y:auto;
  }
  .brand{ grid-column:1; }
  .nav-toggle{ display:none; }
  .spine__tagline{
    display:block;
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.1em;
    line-height:1.6;
    color:rgba(232,217,168,.62);
    padding-bottom:14px;
    border-bottom:1px dashed rgba(185,138,46,.5);
  }
  .nav{
    grid-column:1;
    max-height:none;
    opacity:1;
    visibility:visible;
    overflow:visible;
    padding-top:0;
    border-top:0;
  }
  .nav__list{ gap:4px; }
  .nav__link{ padding:10px 13px; font-size:15px; border-radius:var(--r-pill); }
  .spine__meta{
    display:flex;
    flex-direction:column;
    gap:5px;
    margin-top:auto;
    padding-top:16px;
    border-top:1px dashed rgba(185,138,46,.5);
  }
  .spine__issue{
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.2em;
    color:var(--orange);
  }
  .spine__hint{
    font-family:var(--font-mono);
    font-size:11px;
    line-height:1.6;
    color:rgba(232,217,168,.55);
  }
  .scroll-progress{
    left:auto;
    right:0;
    bottom:auto;
    top:0;
    width:4px;
    height:var(--p,0%);
    background:linear-gradient(180deg,var(--cyan),var(--orange));
  }
  .foot__grid{ grid-template-columns:1.15fr .85fr 1.2fr; }
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
  }
  .btn:hover,
  .index-strip__row:hover{ transform:none; }
}