/* ==========================================================================
   不朽情缘指南 — 共享样式表 /assets/site.css
   01 变量与重置 · 02 排版 · 03 布局与分区 · 04 通用组件 · 05 页头 · 06 页脚
   07 图片容器 · 08 动效 · 09 响应式
   ========================================================================== */

/* ---------- 01 变量与重置 ---------- */
:root{
  --ink:#0B0B0C;
  --ink-soft:#14181B;
  --gold:#C8A45D;
  --gold-soft:#E6D3AE;
  --cream:#F4EBDD;
  --porcelain:#FBF8F2;
  --brown:#241C18;
  --celadon:#6E8F7D;
  --cinnabar:#B4472F;
  --mist:#8C8780;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;

  --maxw:1280px;
  --gutter:clamp(20px,4vw,56px);
  --line-dark:rgba(200,164,93,.28);
  --line-light:rgba(36,28,24,.16);
  --shadow-soft:0 12px 34px -24px rgba(0,0,0,.65);
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.38s;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:112px;
}

body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  background:var(--cream);
  color:var(--brown);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
a{color:inherit}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(200,164,93,.32);color:var(--ink)}

:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
}
.section--ink :focus-visible,
.site-footer :focus-visible{
  outline-color:var(--gold-soft);
}

.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ---------- 02 排版 ---------- */
.display-title{
  font-family:var(--font-display);
  font-weight:200;
  font-size:clamp(40px,7.2vw,92px);
  line-height:1.04;
  letter-spacing:-.01em;
}

.section-title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(26px,4vw,46px);
  line-height:1.24;
  letter-spacing:.005em;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:16px;
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:currentColor;
  opacity:.7;
}

.prose{
  max-width:38em;
  font-size:clamp(15px,1.5vw,17px);
  line-height:1.78;
  color:var(--brown);
}
.prose p + p{margin-top:1.1em}
.prose a{
  color:var(--cinnabar);
  text-decoration:none;
  border-bottom:1px solid rgba(180,71,47,.35);
}
.prose a:hover{border-bottom-color:var(--cinnabar)}

.hairline{
  height:1px;
  border:0;
  margin:0;
  background:var(--line-light);
}

/* ---------- 03 布局与分区 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:820px}

.section{padding-block:clamp(56px,8vw,120px)}
.section--cream{background:var(--cream);color:var(--brown)}
.section--paper{background:var(--porcelain);color:var(--brown)}
.section--ink{background:var(--ink);color:rgba(251,248,242,.86)}
.section--ink .section-title{color:var(--porcelain)}
.section--ink .prose{color:rgba(251,248,242,.78)}

.grid{
  display:grid;
  gap:clamp(16px,2.4vw,32px);
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 04 通用组件 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  border-radius:999px;
  border:1px solid transparent;
  background:transparent;
  font-size:14px;
  letter-spacing:.08em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn--gold{
  background:var(--gold);
  border-color:var(--gold);
  color:var(--ink);
}
.btn--gold:hover{background:var(--gold-soft);border-color:var(--gold-soft)}
.btn--ghost{
  border-color:rgba(200,164,93,.48);
  color:var(--gold);
}
.btn--ghost:hover{
  background:rgba(200,164,93,.14);
  border-color:var(--gold);
  color:var(--gold-soft);
}
.btn--ink{
  background:var(--ink);
  border-color:var(--ink);
  color:var(--gold-soft);
}
.btn--ink:hover{background:var(--ink-soft);border-color:var(--gold)}

.breadcrumbs{padding-block:22px}
.breadcrumbs-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--mist);
}
.breadcrumbs-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs-item + .breadcrumbs-item::before{
  content:"/";
  color:rgba(140,135,128,.55);
}
.breadcrumbs-item a{
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.breadcrumbs-item a:hover{color:var(--gold)}
.breadcrumbs-item [aria-current="page"]{color:var(--brown)}

.archive-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:clamp(20px,2.4vw,28px);
  border:1px solid var(--line-light);
  border-radius:2px;
  background:rgba(251,248,242,.62);
  color:inherit;
  text-decoration:none;
  box-shadow:var(--shadow-soft);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.archive-card:hover,
.archive-card:focus-visible{
  border-color:rgba(200,164,93,.8);
  background:var(--porcelain);
  transform:translateY(-2px);
}
.archive-card--ink{
  background:rgba(20,24,27,.72);
  border-color:rgba(230,211,174,.2);
  color:rgba(251,248,242,.86);
}
.archive-card--ink:hover,
.archive-card--ink:focus-visible{
  background:rgba(20,24,27,.94);
  border-color:var(--gold);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border-radius:999px;
  border:1px solid currentColor;
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.7;
  color:var(--mist);
}
.tag--gold{color:var(--gold)}
.tag--celadon{color:var(--celadon)}
.tag--cinnabar{color:var(--cinnabar)}

.index-row{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;
  gap:16px;
  padding:16px 6px;
  border-bottom:1px solid var(--line-light);
  text-decoration:none;
  color:inherit;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.index-row:hover,
.index-row:focus-visible{
  background:rgba(200,164,93,.09);
  border-bottom-color:rgba(200,164,93,.7);
  padding-left:12px;
}
.index-num{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--gold);
}

/* ---------- 05 页头 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:12px;
  z-index:200;
  padding:10px 20px;
  border-radius:999px;
  background:var(--gold);
  color:var(--ink);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:sticky;
  top:0;
  z-index:120;
  padding:clamp(12px,1.6vw,20px) var(--gutter);
  pointer-events:none;
  background:transparent;
}

.header-rail{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  pointer-events:none;
}

.brand-island{
  pointer-events:auto;
  display:inline-flex;
  align-items:center;
  gap:12px;
  padding:9px 20px 9px 10px;
  border-radius:999px;
  border:1px solid rgba(230,211,174,.22);
  background:rgba(11,11,12,.88);
  color:var(--gold-soft);
  text-decoration:none;
  -webkit-backdrop-filter:blur(10px) saturate(120%);
  backdrop-filter:blur(10px) saturate(120%);
  box-shadow:0 12px 32px -26px #000;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.brand-island:hover,
.brand-island:focus-visible{
  border-color:rgba(200,164,93,.7);
  background:rgba(11,11,12,.96);
}

.brand-seal{
  flex:0 0 auto;
  width:34px;
  height:34px;
  display:grid;
  place-items:center;
  border:1px solid rgba(200,164,93,.6);
  border-radius:2px;
  background:rgba(200,164,93,.1);
  font-family:var(--font-display);
  font-size:15px;
  line-height:1;
  color:var(--gold);
  transition:background var(--dur) var(--ease);
}
.brand-island:hover .brand-seal{background:rgba(200,164,93,.2)}

.brand-text{display:block;min-width:0}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:400;
  letter-spacing:.12em;
  line-height:1.3;
  color:var(--porcelain);
  white-space:nowrap;
}
.brand-tag{
  display:block;
  margin-top:3px;
  font-size:10px;
  letter-spacing:.2em;
  line-height:1.4;
  color:rgba(200,164,93,.78);
  white-space:nowrap;
}

.nav-island{
  pointer-events:auto;
  position:relative;
  display:flex;
  align-items:center;
  padding:6px;
  border-radius:999px;
  border:1px solid rgba(230,211,174,.22);
  background:rgba(11,11,12,.88);
  overflow:hidden;
  -webkit-backdrop-filter:blur(10px) saturate(120%);
  backdrop-filter:blur(10px) saturate(120%);
  box-shadow:0 12px 32px -26px #000;
}

.nav-panel-title{display:none}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:navi;
}

.nav-item{margin:0}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:10px 14px;
  border-radius:999px;
  font-size:13px;
  letter-spacing:.06em;
  line-height:1.4;
  color:rgba(251,248,242,.76);
  text-decoration:none;
  white-space:nowrap;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-link::before{
  counter-increment:navi;
  content:counter(navi,decimal-leading-zero);
  font-size:10px;
  letter-spacing:.1em;
  color:rgba(200,164,93,.55);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:6px;
  height:1px;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform var(--dur) var(--ease);
}
.nav-link:hover{
  color:var(--porcelain);
  background:rgba(200,164,93,.14);
}
.nav-link:hover::before{color:var(--gold);transform:translateY(-2px)}
.nav-link[aria-current="page"]{
  color:var(--gold);
  background:rgba(200,164,93,.16);
}
.nav-link[aria-current="page"]::before{color:var(--gold)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:1px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),rgba(200,164,93,.15));
  pointer-events:none;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:11px 18px;
  border-radius:999px;
  border:1px solid rgba(230,211,174,.24);
  background:rgba(11,11,12,.9);
  color:var(--gold-soft);
  font-size:12px;
  letter-spacing:.18em;
  line-height:1.2;
  cursor:pointer;
  -webkit-backdrop-filter:blur(10px) saturate(120%);
  backdrop-filter:blur(10px) saturate(120%);
  box-shadow:0 12px 32px -24px #000;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible{border-color:var(--gold)}

.nav-toggle-glyph{
  position:relative;
  display:block;
  width:16px;
  height:10px;
}
.nav-toggle-glyph::before,
.nav-toggle-glyph::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:1px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),top var(--dur) var(--ease);
}
.nav-toggle-glyph::before{top:1px}
.nav-toggle-glyph::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph::after{top:5px;transform:rotate(-45deg)}

.nav-toggle-label{display:inline-block;white-space:nowrap}

/* ---------- 06 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:rgba(251,248,242,.72);
  padding-block:clamp(48px,7vw,88px) clamp(28px,4vw,44px);
  font-size:14px;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:2px;
  background:linear-gradient(90deg,var(--gold) 0 38%,var(--celadon) 38% 58%,var(--cinnabar) 58% 100%);
  opacity:.6;
}

.footer-inner{
  display:block;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1fr) minmax(0,1.55fr) minmax(240px,.95fr);
  gap:clamp(28px,4vw,64px);
  align-items:start;
  padding-bottom:clamp(30px,4.5vw,56px);
  border-bottom:1px solid rgba(200,164,93,.2);
}

.footer-brand{min-width:0}
.footer-eyebrow{
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:16px;
}
.footer-statement{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(17px,1.9vw,21px);
  line-height:1.72;
  color:var(--gold-soft);
  max-width:20em;
  margin-bottom:24px;
}
.footer-cta{font-size:13px}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.footer-col{min-width:0}
.footer-col-title{
  font-family:var(--font-body);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:16px;
}
.footer-links{
  list-style:none;
  display:grid;
  gap:10px;
}
.footer-link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:rgba(251,248,242,.7);
  text-decoration:none;
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible{
  color:var(--gold-soft);
  transform:translateX(3px);
}

.footer-contact{min-width:0}
.footer-contact-list{
  list-style:none;
  display:grid;
  gap:8px;
}
.footer-contact-row{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:10px;
  padding-bottom:9px;
  border-bottom:1px solid rgba(200,164,93,.16);
}
.footer-contact-label{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--gold);
}
.footer-contact-value{
  font-size:13px;
  letter-spacing:.02em;
  color:rgba(251,248,242,.86);
  word-break:break-word;
}
.copy-btn{
  border:1px solid rgba(200,164,93,.4);
  border-radius:999px;
  background:transparent;
  color:var(--gold-soft);
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.6;
  padding:2px 10px;
  cursor:pointer;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.copy-btn:hover,
.copy-btn:focus-visible{
  background:rgba(200,164,93,.2);
  border-color:var(--gold);
  color:var(--porcelain);
}
.footer-contact-note{
  margin-top:14px;
  font-size:12px;
  line-height:1.75;
  color:rgba(140,135,128,.95);
  max-width:26em;
}
.copy-status{
  min-height:1.4em;
  margin-top:8px;
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--celadon);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 28px;
  padding-top:clamp(20px,3vw,30px);
  font-size:12px;
  letter-spacing:.08em;
  color:rgba(140,135,128,.95);
}
.footer-copyright{color:rgba(251,248,242,.7)}
.footer-icp{color:rgba(140,135,128,.95)}
.footer-update{color:rgba(140,135,128,.82)}

/* ---------- 07 图片容器 ---------- */
.image-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line-light);
  border-radius:2px;
  background:
    radial-gradient(120% 90% at 82% 0%,rgba(200,164,93,.22),transparent 62%),
    linear-gradient(142deg,var(--ink-soft) 0%,var(--brown) 58%,var(--ink) 100%);
  aspect-ratio:4 / 3;
  box-shadow:var(--shadow-soft);
}
.image-frame--wide{aspect-ratio:16 / 9}
.image-frame--tall{aspect-ratio:3 / 4}
.image-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.image-frame::after{
  content:"";
  position:absolute;
  inset:0;
  border:1px solid rgba(230,211,174,.16);
  pointer-events:none;
}
.image-caption{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.1em;
  line-height:1.7;
  color:var(--mist);
}

/* ---------- 08 动效 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.has-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

html.nav-open,
html.nav-open body{
  overflow:hidden;
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{
    opacity:1 !important;
    transform:none !important;
  }
  .archive-card:hover,
  .archive-card:focus-visible,
  .footer-link:hover,
  .footer-link:focus-visible{transform:none}
}

/* ---------- 09 响应式 ---------- */
@media (max-width:1280px){
  .nav-link{padding:10px 11px;font-size:12.5px;letter-spacing:.04em}
  .nav-link::before{font-size:9.5px}
  .brand-tag{font-size:9.5px;letter-spacing:.16em}
}

@media (max-width:1080px){
  html{scroll-padding-top:88px}

  .site-header{padding:12px 16px}
  .header-rail{justify-content:flex-start}

  .brand-island{padding:7px 14px 7px 7px;gap:9px}
  .brand-seal{width:28px;height:28px;font-size:13px}
  .brand-name{font-size:13px;letter-spacing:.08em}
  .brand-tag{display:none}

  .nav-toggle{
    display:inline-flex;
    position:fixed;
    left:50%;
    bottom:calc(16px + env(safe-area-inset-bottom,0px));
    transform:translateX(-50%);
    z-index:130;
  }

  .nav-island{
    position:fixed;
    inset:0;
    z-index:125;
    flex-direction:column;
    align-items:stretch;
    justify-content:center;
    gap:6px;
    padding:88px 22px 128px;
    border:0;
    border-radius:0;
    background:rgba(9,9,10,.97);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(10px);
    transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease);
  }
  .site-header[data-open] .nav-island{
    opacity:1;
    visibility:visible;
    transform:none;
  }

  .nav-panel-title{
    display:block;
    max-width:520px;
    width:100%;
    margin:0 auto 14px;
    font-size:11px;
    letter-spacing:.3em;
    text-transform:uppercase;
    color:var(--gold);
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
    max-width:520px;
    margin-inline:auto;
  }
  .nav-link{
    justify-content:flex-start;
    gap:14px;
    padding:16px 6px;
    border-radius:2px;
    border-bottom:1px solid rgba(200,164,93,.18);
    font-family:var(--font-display);
    font-size:clamp(19px,4.4vw,24px);
    font-weight:300;
    letter-spacing:.04em;
    color:rgba(251,248,242,.86);
  }
  .nav-link::before{
    width:30px;
    flex:0 0 auto;
    font-family:var(--font-body);
    font-size:11px;
    letter-spacing:.14em;
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{background:rgba(200,164,93,.12)}

  .nav-progress{display:none}

  .site-footer{padding-bottom:calc(clamp(28px,4vw,44px) + 62px)}
  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:760px){
  .footer-top{grid-template-columns:1fr;gap:32px}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
  .footer-statement{max-width:none}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px}

  .grid--3,
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:560px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--2,
  .grid--3,
  .grid--4{grid-template-columns:minmax(0,1fr)}
  .index-row{grid-template-columns:auto minmax(0,1fr);row-gap:6px}
  .nav-toggle{padding:10px 16px;font-size:11px}
  .breadcrumbs-list{font-size:11px}
}