/* ============================================================
   皇家国际会馆 · 全站共享样式  /assets/site.css
   深蓝夜宴底 / 香槟金细线 / 侧边轨道导航 / 堆叠面板
   ============================================================ */

:root{
  --royal-blue-950:#050B1A;
  --royal-blue-900:#0A1733;
  --royal-blue-700:#16305F;
  --champagne-500:#C9A45C;
  --champagne-200:#EBD9AD;
  --claret-700:#6E1B2A;
  --emerald-600:#0F5C4B;
  --ivory-100:#F5F1E8;
  --slate-300:#A9B6CC;
  --brass-line:#8A6F3A;
  --glass-veil:rgba(245,241,232,.08);
  --hair:rgba(138,111,58,.42);
  --hair-soft:rgba(138,111,58,.22);

  --font-display:"Songti SC","Source Han Serif SC","Noto Serif CJK SC","Noto Serif SC",STSong,SimSun,serif;
  --font-body:"PingFang SC","Source Han Sans SC","Noto Sans CJK SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-num:"Barlow Condensed","Oswald","Helvetica Neue Condensed","Arial Narrow",system-ui,sans-serif;

  --rail-w:88px;
  --topbar-h:58px;
  --maxw:1360px;
  --gutter:clamp(20px,4vw,64px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

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

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

body{
  margin:0;
  min-height:100vh;
  padding-left:var(--rail-w);
  background-color:var(--royal-blue-950);
  background-image:
    radial-gradient(1150px 800px at 82% -14%, rgba(201,164,92,.10), transparent 62%),
    radial-gradient(900px 720px at -10% 34%, rgba(22,48,95,.52), transparent 66%),
    linear-gradient(180deg,#050B1A 0%,#07112A 46%,#050B1A 100%);
  background-attachment:fixed;
  color:var(--ivory-100);
  font-family:var(--font-body);
  font-size:clamp(16px,.28vw + 15px,18px);
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.18;
  letter-spacing:.015em;
}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

:focus-visible{outline:2px solid var(--champagne-500);outline-offset:3px}

main{display:block}
main:focus{outline:none}

/* ---------- 通用容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

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

.divider{
  height:1px;border:0;margin:0;
  background:linear-gradient(90deg,var(--brass-line),rgba(138,111,58,0) 78%);
  opacity:.6;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:calc(var(--rail-w) + 14px);
  z-index:200;
  padding:10px 18px;
  background:var(--champagne-500);
  color:var(--royal-blue-950);
  font-size:13px;
  letter-spacing:.14em;
  transform:translateY(-180%);
  transition:transform 200ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 侧边轨道导航 ---------- */
.site-rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail-w);
  z-index:90;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:20px 0 18px;
  background:linear-gradient(180deg,#050B1A 0%,#071026 52%,#050B1A 100%);
  border-right:1px solid var(--hair);
}

.rail__brand{
  width:calc(100% - 22px);
  display:flex;
  flex-direction:column;
  align-items:center;
  padding-bottom:16px;
  border-bottom:1px solid var(--hair-soft);
}
.rail__mark{display:flex;align-items:center;justify-content:center}
.rail__mark-cn{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-family:var(--font-display);
  font-weight:900;
  font-size:16px;
  line-height:1;
  letter-spacing:.2em;
  color:var(--champagne-200);
  transition:color 180ms var(--ease);
}
.rail__mark:hover .rail__mark-cn{color:var(--champagne-500)}

.rail__nav{
  flex:1 1 auto;
  min-height:0;
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow-y:auto;
  overflow-x:hidden;
}
.rail__list{
  width:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
}
.rail__item{width:100%;display:flex;justify-content:center}
.rail__link{
  position:relative;
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:10px 0;
}
.rail__link::before{
  content:"";
  position:absolute;
  left:0;
  top:14%;
  bottom:14%;
  width:2px;
  background:var(--champagne-500);
  opacity:0;
  transition:opacity 180ms var(--ease);
}
.rail__label{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-size:13px;
  line-height:1;
  letter-spacing:.22em;
  color:var(--slate-300);
  transition:color 180ms var(--ease);
}
.rail__link:hover .rail__label{color:var(--ivory-100)}
.rail__link[aria-current="page"]::before{opacity:1}
.rail__link[aria-current="page"] .rail__label{color:var(--champagne-200)}

.rail__foot{
  width:calc(100% - 22px);
  padding-top:16px;
  border-top:1px solid var(--hair-soft);
  display:flex;
  justify-content:center;
}
.rail__cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  writing-mode:vertical-rl;
  text-orientation:upright;
  padding:16px 9px;
  border:1px solid var(--champagne-500);
  background:rgba(201,164,92,.06);
  color:var(--champagne-200);
  font-size:13px;
  line-height:1;
  letter-spacing:.18em;
  transition:background-color 180ms var(--ease),color 180ms var(--ease);
}
.rail__cta:hover{background:var(--champagne-500);color:var(--royal-blue-950)}

.rail__toggle{
  display:none;
  width:40px;height:40px;
  align-items:center;
  justify-content:center;
  border:1px solid var(--brass-line);
  background:transparent;
  transition:border-color 180ms var(--ease);
}
.rail__toggle:hover{border-color:var(--champagne-500)}
.rail__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.rail__bars i{
  display:block;height:1px;width:100%;
  background:var(--champagne-500);
  transition:transform 200ms var(--ease),opacity 200ms var(--ease);
}
.rail__bars i:nth-child(2){width:70%}
.rail__toggle[aria-expanded="true"] .rail__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.rail__toggle[aria-expanded="true"] .rail__bars i:nth-child(2){opacity:0}
.rail__toggle[aria-expanded="true"] .rail__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.site-foot{
  position:relative;
  margin-top:clamp(64px,8vw,120px);
  background:linear-gradient(180deg,rgba(10,23,51,.55),rgba(5,11,26,.98));
  border-top:1px solid var(--hair);
}
.site-foot::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--champagne-500) 22%,rgba(201,164,92,0) 72%);
  opacity:.7;
}
.foot__inner{padding-block:clamp(48px,6vw,88px) 28px}

.foot__grid{
  display:grid;
  grid-template-columns:minmax(0,1.45fr) minmax(0,1fr) minmax(0,.85fr);
  gap:clamp(28px,4vw,64px);
  align-items:start;
}
.foot__brand{min-width:0}
.foot__mark{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}
.foot__mark-cn{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(24px,2.4vw,32px);
  letter-spacing:.06em;
  color:var(--champagne-200);
}
.foot__mark-en{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.42em;
  text-transform:uppercase;
  color:var(--slate-300);
}
.foot__line{
  max-width:32em;
  margin-bottom:24px;
  font-size:15px;
  color:var(--slate-300);
}

.foot__col{min-width:0}
.foot__col-title{
  font-size:16px;
  font-weight:900;
  letter-spacing:.22em;
  color:var(--champagne-500);
  padding-bottom:10px;
  margin-bottom:16px;
  border-bottom:1px solid var(--hair-soft);
}
.foot__list{display:grid;gap:10px}
.foot__item{font-size:14px;line-height:1.7;color:var(--slate-300);word-break:break-word}
.foot__strong{color:var(--ivory-100)}
.foot__link{
  display:inline-block;
  font-size:15px;
  color:var(--slate-300);
  border-bottom:1px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.foot__link:hover{color:var(--champagne-200);border-bottom-color:var(--champagne-500)}

.foot__rule{
  height:1px;
  margin-block:clamp(32px,4vw,56px) 20px;
  background:linear-gradient(90deg,var(--brass-line),rgba(138,111,58,0) 82%);
  opacity:.55;
}
.foot__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  font-size:13px;
  color:var(--slate-300);
}
.foot__copy{letter-spacing:.06em}
.foot__icp{font-family:var(--font-num);letter-spacing:.18em}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 26px;
  border:1px solid var(--champagne-500);
  border-radius:var(--radius);
  background:transparent;
  color:var(--champagne-200);
  font-size:14px;
  letter-spacing:.18em;
  line-height:1.2;
  cursor:pointer;
  transition:background-color 180ms var(--ease),color 180ms var(--ease),
             border-color 180ms var(--ease),transform 180ms var(--ease);
}
.btn:hover{background:var(--champagne-500);color:var(--royal-blue-950);transform:translateY(-2px)}
.btn--gold{
  background:var(--champagne-500);
  color:var(--royal-blue-950);
  font-weight:600;
}
.btn--gold:hover{background:var(--champagne-200);border-color:var(--champagne-200)}
.btn--ghost{border-color:var(--brass-line);color:var(--slate-300)}
.btn--ghost:hover{background:var(--glass-veil);color:var(--ivory-100);border-color:var(--champagne-500)}

/* ---------- 标签与状态 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid var(--brass-line);
  border-radius:var(--radius);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.16em;
  color:var(--slate-300);
}
.chip--claret{
  border-color:rgba(110,27,42,.9);
  background:rgba(110,27,42,.2);
  color:#E7AEB8;
}
.chip--emerald{
  border-color:rgba(15,92,75,.95);
  background:rgba(15,92,75,.2);
  color:#8FD8C4;
}

/* ---------- 排版组件 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-display);
  font-size:13px;
  letter-spacing:.3em;
  color:var(--champagne-500);
}

.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(48px,8.2vw,120px);
  line-height:1.02;
  letter-spacing:.01em;
  color:var(--ivory-100);
}

.section-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:0 clamp(16px,2vw,30px);
  align-items:start;
  margin-bottom:clamp(24px,3vw,40px);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(28px,3.4vw,56px);
  font-weight:900;
  line-height:1.18;
}
.lede{
  max-width:38em;
  margin-top:16px;
  font-size:clamp(16px,1.1vw,18px);
  color:var(--slate-300);
}
.num{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
}
.vnote{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--champagne-500);
  opacity:.9;
}

/* ---------- 正文列 ---------- */
.prose{max-width:38em;line-height:1.85}
.prose p + p{margin-top:20px}
.prose h2{
  font-size:clamp(24px,2.4vw,34px);
  margin-top:clamp(32px,4vw,48px);
  margin-bottom:14px;
}
.prose h3{
  font-size:clamp(19px,1.6vw,24px);
  margin-top:28px;
  margin-bottom:10px;
}
.prose ul{margin-top:16px}
.prose li{position:relative;padding-left:20px}
.prose li + li{margin-top:10px}
.prose li::before{
  content:"";
  position:absolute;
  left:0;top:.78em;
  width:8px;height:1px;
  background:var(--champagne-500);
}
.prose strong{color:var(--champagne-200);font-weight:600}

/* ---------- 面板堆叠 ---------- */
.panel-stack{display:grid;gap:clamp(16px,2.4vw,32px)}
.panel{
  position:relative;
  padding:clamp(24px,3.6vw,56px);
  border:1px solid var(--hair);
  border-radius:var(--radius);
  background:var(--royal-blue-900);
  box-shadow:inset 0 1px 0 rgba(245,241,232,.04), 0 20px 44px -34px rgba(0,0,0,.95);
}
.panel--deep{background:var(--royal-blue-950)}
.panel--raise{background:linear-gradient(180deg,var(--royal-blue-700),var(--royal-blue-900))}
.panel--veil{
  background:var(--glass-veil);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.panel--shift{margin-left:clamp(0px,4vw,48px)}
.panel--flush{margin-right:clamp(0px,4vw,48px)}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.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))}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  aspect-ratio:4/3;
  overflow:hidden;
  border:1px solid var(--hair);
  border-radius:var(--radius);
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(201,164,92,.16), transparent 58%),
    linear-gradient(140deg,rgba(22,48,95,.92),rgba(5,11,26,.98));
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    repeating-linear-gradient(90deg,rgba(201,164,92,.10) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(0deg,rgba(201,164,92,.07) 0 1px,transparent 1px 48px);
  opacity:.55;
}
.media-frame > img,
.media-frame > picture > img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  z-index:1;
}
.media-frame--wide{aspect-ratio:16/7}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__cap{
  position:absolute;
  left:14px;bottom:12px;
  z-index:2;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--champagne-200);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin-bottom:clamp(20px,3vw,32px)}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--slate-300);
}
.breadcrumb li + li::before{
  content:"/";
  margin-right:8px;
  color:var(--brass-line);
}
.breadcrumb a{
  color:var(--slate-300);
  border-bottom:1px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.breadcrumb a:hover{color:var(--champagne-200);border-bottom-color:var(--champagne-500)}

/* ---------- 筛选条 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  padding:9px 16px;
  border:1px solid var(--hair);
  border-radius:var(--radius);
  background:transparent;
  color:var(--slate-300);
  font-size:13px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:color 180ms var(--ease),border-color 180ms var(--ease),
             background-color 180ms var(--ease);
}
.filter-btn:hover{color:var(--ivory-100);border-color:var(--champagne-500)}
.filter-btn[aria-pressed="true"]{
  background:var(--champagne-500);
  border-color:var(--champagne-500);
  color:var(--royal-blue-950);
  font-weight:600;
}

/* ---------- 入场渐显 ---------- */
[data-reveal]{transition:opacity 240ms var(--ease),transform 240ms var(--ease)}
html.js [data-reveal]{opacity:0;transform:translateY(12px)}
html.js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 返回顶部（可选） ---------- */
.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:70;
  width:44px;height:44px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--brass-line);
  background:rgba(5,11,26,.86);
  color:var(--champagne-200);
  font-family:var(--font-num);
  font-size:16px;
  opacity:0;
  pointer-events:none;
  transition:opacity 200ms var(--ease),border-color 180ms var(--ease);
}
.to-top[data-visible]{opacity:1;pointer-events:auto}
.to-top:hover{border-color:var(--champagne-500)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot__grid{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}
  .foot__col:last-child{grid-column:1 / -1}
}

@media (max-width:900px){
  :root{--rail-w:0px}

  body{padding-top:var(--topbar-h)}

  .site-rail{
    inset:0 0 auto 0;
    width:100%;
    height:var(--topbar-h);
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:0;
    padding:0 18px;
    background:#050B1A;
    border-right:0;
    border-bottom:1px solid var(--hair);
  }

  .rail__brand{
    width:auto;
    padding:0;
    border-bottom:0;
    flex-direction:row;
    align-items:center;
  }
  .rail__mark-cn{
    writing-mode:horizontal-tb;
    font-size:16px;
    letter-spacing:.14em;
  }

  .rail__foot{display:none}

  .rail__toggle{display:inline-flex}

  .rail__nav{
    position:fixed;
    top:0;left:0;bottom:0;
    width:min(82vw,320px);
    display:flex;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    padding:calc(var(--topbar-h) + 22px) 22px 30px;
    background:#0A1733;
    border-right:1px solid var(--brass-line);
    overflow-y:auto;
    transform:translateX(-104%);
    transition:transform 260ms var(--ease);
    z-index:95;
  }
  .rail__nav[data-open]{transform:translateX(0)}

  .rail__list{width:100%;align-items:stretch;gap:0}
  .rail__item{display:block;width:100%}
  .rail__link{
    justify-content:flex-start;
    width:100%;
    padding:15px 6px;
    border-bottom:1px solid var(--hair-soft);
  }
  .rail__link::before{
    left:0;top:10px;bottom:10px;
    width:2px;
  }
  .rail__label{
    writing-mode:horizontal-tb;
    text-orientation:mixed;
    font-size:16px;
    letter-spacing:.16em;
  }

  body[data-nav-open]{overflow:hidden}
  body[data-nav-open]::after{
    content:"";
    position:fixed;
    inset:0;
    z-index:92;
    background:rgba(5,11,26,.74);
  }

  .section-head{grid-template-columns:minmax(0,1fr)}
  .vnote{writing-mode:horizontal-tb;letter-spacing:.3em;margin-bottom:10px}

  .panel--shift,.panel--flush{margin-left:0;margin-right:0}

  .foot__grid{grid-template-columns:minmax(0,1fr)}
  .foot__col:last-child{grid-column:auto}
}

@media (max-width:640px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .btn{width:100%;justify-content:center}
  .foot__meta{flex-direction:column;align-items:flex-start;gap:6px}
  .display{font-size:clamp(40px,12vw,64px)}
}

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