/* ============================================================
   永信贵宾会资料库 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B1F33;
  --ink-2:#13314F;
  --blue:#1E4C7A;
  --gold:#C9A227;
  --gold-soft:#E8CF8A;
  --cinnabar:#B4342A;
  --moon:#F7F4EC;
  --paper:#EFE7D6;
  --grey:#D9DEE4;
  --text:#1A1A1A;

  --line:rgba(232,207,138,.28);
  --line-soft:rgba(232,207,138,.14);
  --line-cool:rgba(30,76,122,.26);
  --on-dark:rgba(247,244,236,.78);
  --on-dark-dim:rgba(247,244,236,.54);

  --wrap:1180px;
  --wrap-narrow:720px;
  --gutter:clamp(1rem,3vw,2.25rem);

  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Courier New",monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:240ms;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth}
}
body{
  margin:0;
  background:var(--moon);
  color:var(--text);
  font-family:var(--sans);
  font-size:1rem;
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dd,figure,blockquote,address{margin:0}
ul,ol{padding:0}
img,svg,video{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue)}
::selection{background:var(--gold);color:var(--ink)}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--serif);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.012em;
  color:var(--ink);
  margin:0 0 .55em;
}
h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.08;letter-spacing:-.022em}
h2{font-size:clamp(1.6rem,3.4vw,2.6rem);letter-spacing:-.016em}
h3{font-size:clamp(1.15rem,2vw,1.5rem)}
h4{font-size:1.0625rem}
p{margin:0 0 1em}
strong{font-weight:600}
small{font-size:.8125rem}

/* ---------- 4. 通用容器与工具 ---------- */
.shell{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.shell-narrow{max-width:var(--wrap-narrow)}
.mono{font-family:var(--mono);letter-spacing:.06em;font-variant-numeric:tabular-nums}
.muted{color:rgba(26,26,26,.6)}
.rule{height:1px;border:0;background:var(--line-cool);margin:clamp(1.5rem,4vw,2.5rem) 0}
.skip-link{
  position:absolute;
  top:.5rem;left:.5rem;
  z-index:200;
  transform:translateY(-200%);
  background:var(--gold);
  color:var(--ink);
  font-size:.875rem;
  font-weight:600;
  padding:.55rem 1rem;
  border-radius:2px;
}
.skip-link:focus{transform:none}

.prose{max-width:44rem;font-size:1.0625rem;line-height:1.8}
.prose h2{font-size:clamp(1.4rem,2.6vw,1.9rem);margin:2em 0 .6em}
.prose h3{margin:1.6em 0 .5em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.25em}
.prose li{margin:0 0 .4em}
.prose a{border-bottom:1px solid rgba(30,76,122,.4)}

.grid{display:grid;gap:clamp(1rem,2.5vw,1.75rem)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}

.panel-dark{background:var(--ink);color:var(--on-dark)}
.panel-deep{background:var(--ink-2);color:var(--on-dark)}
.panel-paper{background:var(--paper);color:var(--text)}
.panel-moon{background:var(--moon);color:var(--text)}
.panel-dark h1,.panel-dark h2,.panel-dark h3,.panel-dark h4,
.panel-deep h1,.panel-deep h2,.panel-deep h3,.panel-deep h4{color:var(--moon)}
.panel-dark a,.panel-deep a{color:var(--gold-soft)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.62rem 1.15rem;
  font-family:var(--sans);
  font-size:.875rem;
  font-weight:600;
  letter-spacing:.05em;
  line-height:1.3;
  border:1px solid transparent;
  border-radius:2px;
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color 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);color:var(--ink)}
.btn-line{background:transparent;border-color:rgba(232,207,138,.55);color:var(--moon)}
.btn-line:hover{border-color:var(--gold-soft);color:var(--gold-soft)}
.btn-ink{background:var(--ink);border-color:var(--ink);color:var(--moon)}
.btn-ink:hover{background:var(--ink-2);border-color:var(--ink-2);color:var(--moon)}
.btn-cinnabar{background:transparent;border-color:rgba(180,52,42,.55);color:var(--cinnabar)}
.btn-cinnabar:hover{background:var(--cinnabar);border-color:var(--cinnabar);color:var(--moon)}

/* ---------- 6. 页头 ---------- */
.site-head{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  color:var(--moon);
  transition:box-shadow var(--dur) var(--ease);
}
.site-head[data-scrolled]{box-shadow:0 12px 34px rgba(11,31,51,.32)}

.head-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  height:2px;
  background:var(--line-soft);
}
.head-progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--gold),var(--gold-soft));
}

.head-wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}

.head-strip{background:var(--ink);border-bottom:1px solid var(--line-soft)}
.head-strip-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  min-height:2.25rem;
  font-size:.75rem;
  letter-spacing:.07em;
  color:var(--on-dark-dim);
}
.head-strip-note{color:var(--gold-soft)}
.head-strip-meta{font-size:.75rem}

.head-bar{position:relative;border-bottom:1px solid var(--line)}
.head-bar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1.5rem;
  min-height:4.5rem;
  border-left:1px solid var(--line-soft);
  border-right:1px solid var(--line-soft);
}

.head-brand{
  display:flex;
  flex-direction:column;
  gap:.1rem;
  padding:.55rem 0;
  color:var(--moon);
  text-decoration:none;
  flex:0 0 auto;
}
.head-brand:hover{color:var(--moon)}
.head-brand-mark{
  font-family:var(--serif);
  font-weight:700;
  font-size:1.0625rem;
  letter-spacing:.02em;
}
.head-brand-tag{
  font-size:.6875rem;
  letter-spacing:.22em;
  color:var(--gold-soft);
}

.head-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  background:transparent;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--moon);
  font-size:.8125rem;
  letter-spacing:.1em;
  padding:.5rem .8rem;
  cursor:pointer;
}
.head-toggle-lines{
  position:relative;
  display:block;
  width:16px;
  height:1.5px;
  background:currentColor;
  transition:background-color var(--dur) var(--ease);
}
.head-toggle-lines::before,
.head-toggle-lines::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:1.5px;
  background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.head-toggle-lines::before{top:-5px}
.head-toggle-lines::after{top:5px}
.head-toggle[aria-expanded="true"] .head-toggle-lines{background:transparent}
.head-toggle[aria-expanded="true"] .head-toggle-lines::before{transform:translateY(5px) rotate(45deg)}
.head-toggle[aria-expanded="true"] .head-toggle-lines::after{transform:translateY(-5px) rotate(-45deg)}

.head-nav{
  display:flex;
  align-items:center;
  gap:clamp(.75rem,2vw,1.75rem);
}
.head-nav-list{
  display:flex;
  align-items:center;
  gap:clamp(.6rem,1.5vw,1.35rem);
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:navidx;
}
.head-nav-item{
  display:flex;
  align-items:baseline;
  gap:.35rem;
  counter-increment:navidx;
}
.head-nav-item::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  color:var(--gold-soft);
  opacity:.7;
}
.head-nav-link{
  display:inline-block;
  padding:.35rem 0;
  font-size:.9rem;
  color:var(--moon);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.head-nav-link:hover{color:var(--gold-soft)}
.head-nav-link[aria-current="page"]{
  color:var(--gold);
  border-bottom-color:var(--gold);
}
.head-nav-cta{
  display:flex;
  align-items:center;
  gap:.5rem;
  padding-left:clamp(.75rem,2vw,1.75rem);
  border-left:1px solid var(--line);
}

/* ---------- 7. 页脚 ---------- */
.site-foot{
  background:var(--ink);
  color:var(--on-dark);
}
.foot-wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.foot-top{
  position:relative;
  border-top:1px solid rgba(201,162,39,.5);
  padding:clamp(2.25rem,5vw,3.5rem) 0 clamp(1.75rem,4vw,2.75rem);
}
.foot-top::before{
  content:"";
  position:absolute;
  left:0;right:0;top:6px;
  height:1px;
  background:var(--line-soft);
}
.foot-top .foot-wrap{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.9fr) minmax(0,1.25fr);
  gap:clamp(1.5rem,4vw,3rem);
  align-items:start;
}
.foot-mark{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(1.25rem,2.2vw,1.6rem);
  line-height:1.3;
  color:var(--moon);
  margin:0 0 .3rem;
}
.foot-sub{
  font-size:.8125rem;
  letter-spacing:.2em;
  color:var(--gold-soft);
  margin:0 0 1rem;
}
.foot-meta{font-size:.75rem;color:var(--on-dark-dim);margin:0}

.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(1rem,2.5vw,1.75rem);
}
.foot-col-title{
  position:relative;
  padding-top:.75rem;
  margin:0 0 .9rem;
  font-family:var(--sans);
  font-size:.75rem;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--gold-soft);
}
.foot-col-title::before{
  content:"";
  position:absolute;
  top:0;left:0;
  width:1.5rem;height:1px;
  background:var(--gold);
}
.foot-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:.55rem;
  font-size:.875rem;
}
.foot-list a{
  color:var(--on-dark);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.foot-list a:hover{color:var(--gold-soft);border-bottom-color:rgba(232,207,138,.6)}

.foot-address{font-style:normal;margin:0 0 .25rem}
.foot-line{
  display:grid;
  grid-template-columns:3.25rem minmax(0,1fr);
  gap:.5rem;
  margin:0 0 .5rem;
  font-size:.8125rem;
  line-height:1.6;
  color:var(--on-dark);
}
.foot-key{
  font-family:var(--mono);
  font-size:.6875rem;
  letter-spacing:.1em;
  color:var(--gold-soft);
  padding-top:.2rem;
}
.foot-cta{margin-top:1rem}

.foot-base{
  border-top:1px solid var(--line-soft);
  padding:1rem 0 1.25rem;
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--on-dark-dim);
}
.foot-base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.5rem;
}
.foot-legal,.foot-copy{margin:0}

/* ---------- 8. 通用组件：标签 / 卡片 / 图例 / 刻度 / 索引 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  font-family:var(--mono);
  font-size:.6875rem;
  letter-spacing:.1em;
  padding:.22rem .5rem;
  border:1px solid var(--line-cool);
  background:rgba(247,244,236,.6);
  color:var(--blue);
  border-radius:1px;
}
.tag--gold{border-color:rgba(201,162,39,.5);background:rgba(201,162,39,.12);color:#8A6D10}
.tag--red{border-color:rgba(180,52,42,.42);background:rgba(180,52,42,.1);color:var(--cinnabar)}

.card{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.75rem);
  background:var(--moon);
  border:1px solid var(--line-cool);
}
.card--paper{background:var(--paper);border-color:rgba(11,31,51,.14)}
.card--ink{background:var(--ink-2);border-color:var(--line);color:var(--on-dark)}
.card--ink h3,.card--ink h4{color:var(--moon)}

.legend{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:.55rem;
  font-size:.8125rem;
}
.legend-item{display:flex;align-items:baseline;gap:.6rem}
.legend-key{
  flex:none;
  width:.75rem;height:.75rem;
  border:1.5px solid var(--gold);
  border-radius:1px;
  transform:translateY(1px);
}
.legend-key--cool{border-color:var(--blue)}
.legend-key--red{border-color:var(--cinnabar)}

.scale{
  display:flex;
  gap:.35rem;
  font-family:var(--mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--on-dark-dim);
}

.index-axis{
  position:sticky;
  top:6.5rem;
  align-self:start;
  display:grid;
  gap:.4rem;
  counter-reset:axis;
  font-size:.8125rem;
}
.index-link{
  counter-increment:axis;
  display:flex;
  align-items:baseline;
  gap:.5rem;
  padding:.35rem 0 .35rem .7rem;
  border-left:2px solid var(--line-cool);
  color:rgba(26,26,26,.62);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.index-link::before{
  content:counter(axis,decimal-leading-zero);
  font-family:var(--mono);
  font-size:.6875rem;
  color:var(--gold);
  opacity:.8;
}
.index-link:hover{color:var(--ink);border-left-color:var(--gold)}
.index-link[data-active]{color:var(--ink);font-weight:600;border-left-color:var(--gold)}

/* ---------- 9. 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--ink-2);
  border:1px solid var(--line-cool);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(11,31,51,.06) 0 1px,transparent 1px 4px);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}

/* ---------- 10. 面包屑 ---------- */
.crumb{
  font-family:var(--mono);
  font-size:.75rem;
  letter-spacing:.08em;
  color:var(--blue);
}
.crumb ol{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem;
  list-style:none;
  margin:0;
  padding:0;
}
.crumb li+li::before{content:"／";margin-right:.5rem;color:var(--grey)}
.crumb a{color:inherit;border-bottom:1px dotted currentColor}
.crumb [aria-current="page"]{color:rgba(26,26,26,.6)}

/* ---------- 11. 显现（data-reveal） ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 12. 焦点与可访问性 ---------- */
:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:2px;
}
.site-foot :focus-visible,
.site-head :focus-visible{outline-color:var(--gold-soft)}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1180px){
  .head-brand-tag{display:none}
  .head-nav-link{font-size:.875rem}
}
@media (max-width:1080px){
  .foot-top .foot-wrap{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-ident{grid-column:1 / -1}
}
@media (max-width:980px){
  .head-toggle{display:inline-flex}
  .head-bar-inner{min-height:3.75rem}
  .head-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    background:var(--ink-2);
    border-bottom:1px solid rgba(201,162,39,.45);
    padding:.5rem var(--gutter) 1.25rem;
    max-height:calc(100vh - 7rem);
    overflow-y:auto;
  }
  .head-nav[data-open]{display:flex}
  .head-nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .head-nav-item{
    align-items:center;
    gap:.6rem;
    padding:.15rem 0;
    border-bottom:1px solid var(--line-soft);
  }
  .head-nav-link{
    display:block;
    flex:1;
    padding:.75rem 0;
    font-size:1rem;
  }
  .head-nav-link[aria-current="page"]{
    border-bottom-color:transparent;
    color:var(--gold);
    box-shadow:inset 2px 0 0 var(--gold);
    padding-left:.7rem;
  }
  .head-nav-cta{
    flex-direction:column;
    align-items:stretch;
    gap:.6rem;
    margin-top:1.1rem;
    padding-left:0;
    border-left:0;
    border-top:1px solid var(--line-soft);
    padding-top:1.1rem;
  }
  .head-nav-cta .btn{width:100%}
  .index-axis{position:static;grid-auto-flow:column;overflow-x:auto}
}
@media (max-width:900px){
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:680px){
  .head-strip-note{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .head-strip-meta{display:none}
  .foot-top .foot-wrap{grid-template-columns:minmax(0,1fr)}
  .foot-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-base-inner{flex-direction:column;align-items:flex-start}
}

/* ---------- 14. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
}