/* ============================================================
   澳亚国际中文站 · 共享样式 /assets/site.css
   骨型：展览画册 · 侧边轨道 · 沙金纸底 / 天山蓝结构 / 石榴红事实点
   ============================================================ */

/* ---------- 0. 变量 ---------- */
:root{
  --paper:#FAF5EC;
  --paper-2:#F1E7D6;
  --rule:#D9C7A6;
  --ink-2:#8A7448;
  --ink:#2E2617;
  --blue:#1F4E6B;
  --blue-deep:#123244;
  --red:#B23A32;
  --red-deep:#9C2F28;
  --glass:rgba(255,255,255,.62);
  --glass-line:rgba(217,199,166,.78);
  --mono-ink:#5A6B72;
  --on-dark:#F7F1E6;
  --on-dark-2:rgba(247,241,230,.76);
  --on-dark-3:rgba(247,241,230,.62);

  --font-head:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",SimSun,serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Source Han Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;

  --rail-w:96px;
  --page-max:1280px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-card:0 1px 2px rgba(46,38,23,.05),0 18px 34px -26px rgba(46,38,23,.5);
}

/* ---------- 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,figure,blockquote,dl,dd,fieldset{margin:0}
ul,ol{padding-left:1.25em}
img,svg,video{max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
[hidden]{display:none !important}
::selection{background:rgba(178,58,50,.2);color:var(--ink)}

/* ---------- 2. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  font-weight:400;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(120% 80% at 6% -8%, rgba(217,199,166,.50), rgba(217,199,166,0) 55%),
    radial-gradient(90% 70% at 100% 2%, rgba(31,78,107,.10), rgba(31,78,107,0) 58%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.is-nav-open{overflow:hidden}

@media (min-width:1024px){
  body{padding-left:var(--rail-w);font-size:17px}
}

h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:600;
  line-height:1.32;
  letter-spacing:-.01em;
  color:var(--ink);
}
a{color:var(--blue);text-decoration:none}
.mono{font-family:var(--font-mono);font-size:.86em;letter-spacing:.06em;color:var(--mono-ink)}
.muted{color:var(--ink-2)}

/* 焦点环 */
:focus-visible{
  outline:2px solid var(--red);
  outline-offset:2px;
  border-radius:2px;
}
.visually-hidden{
  position:absolute !important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 3. 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding-inline:clamp(20px,4vw,48px);
}
.container--narrow{max-width:860px}

.section{padding-block:clamp(56px,8vw,112px)}
.section--tight{padding-block:clamp(34px,5vw,64px)}

.grid{display:grid;gap:clamp(24px,3vw,40px)}
@media (min-width:768px){
  .grid--split{grid-template-columns:7fr 5fr;align-items:start}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ---------- 4. 排版组件 ---------- */
.display{font-family:var(--font-head);font-weight:600;font-size:clamp(30px,5vw,44px);line-height:1.26;letter-spacing:-.015em}
.h2{font-family:var(--font-head);font-weight:600;font-size:clamp(24px,3.2vw,32px);line-height:1.34}
.h3{font-family:var(--font-head);font-weight:600;font-size:clamp(19px,2.2vw,22px);line-height:1.45}
.lead{font-size:clamp(17px,1.9vw,20px);line-height:1.72;max-width:62ch}
.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  color:var(--ink-2);text-transform:uppercase;
}
.chapter-num{
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--ink-2);
}
.chapter-num::after{content:"";flex:1;height:1px;background:var(--rule)}

.prose{max-width:74ch}
.prose p{margin-bottom:1.35em}
.prose p:last-child{margin-bottom:0}
.prose h3{margin:2em 0 .6em}
.prose ul,.prose ol{margin-bottom:1.35em}
.prose li{margin-bottom:.5em}
.prose a{color:var(--blue);border-bottom:1px solid var(--red)}
.prose a:hover{border-bottom-width:2px}
.prose strong{font-weight:600;color:var(--ink)}

/* ---------- 5. 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;
  font-family:var(--font-body);font-size:15px;line-height:1.4;
  border:1px solid transparent;border-radius:2px;
  cursor:pointer;
  transition:background-color 200ms var(--ease),color 200ms var(--ease),
             border-color 200ms var(--ease),box-shadow 200ms var(--ease);
}
.btn--primary{background:var(--red);color:var(--on-dark)}
.btn--primary:hover{background:var(--red-deep)}
.btn--ghost{background:transparent;border-color:var(--rule);color:var(--ink)}
.btn--ghost:hover{border-color:var(--blue);color:var(--blue);background:rgba(31,78,107,.05)}
.btn--quiet{background:var(--blue-deep);color:var(--on-dark)}
.btn--quiet:hover{background:var(--blue)}
.btn--rail{
  width:100%;padding:10px 8px;
  font-size:12px;line-height:1.45;letter-spacing:.04em;text-align:center;
  background:var(--red);color:var(--on-dark);
}
.btn--rail:hover{background:var(--red-deep);color:#fff}

.card{
  position:relative;
  background:#fff;
  border:1px solid var(--rule);
  border-radius:3px;
  padding:clamp(20px,2.4vw,28px);
  box-shadow:var(--shadow-card);
}
.card--tint{background:var(--paper-2)}
.card--glass{
  background:var(--glass);
  border-color:var(--glass-line);
  -webkit-backdrop-filter:blur(10px) saturate(1.15);
  backdrop-filter:blur(10px) saturate(1.15);
}

.breadcrumb{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--ink-2);margin-bottom:26px;
}
.breadcrumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--rule)}
.breadcrumb a{color:var(--ink-2);border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--blue);border-bottom-color:var(--red)}

/* 图片容器基础规则（页面阶段在此放入 img / svg） */
.media{display:block;margin:0}
.media__frame{
  position:relative;display:block;width:100%;
  aspect-ratio:4 / 3;overflow:hidden;
  border:1px solid var(--rule);border-radius:3px;
  background-color:var(--paper-2);
  background-image:
    repeating-linear-gradient(90deg, rgba(46,38,23,.07) 0 1px, rgba(46,38,23,0) 1px 32px),
    repeating-linear-gradient(0deg, rgba(46,38,23,.05) 0 1px, rgba(46,38,23,0) 1px 32px),
    radial-gradient(120% 100% at 0% 100%, rgba(31,78,107,.22), rgba(31,78,107,0) 62%),
    linear-gradient(145deg,#F6EEDF 0%,#FAF5EC 42%,#E6D8BE 100%);
}
.media__frame::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;
  background:linear-gradient(90deg,var(--red) 0 56px,rgba(217,199,166,.92) 56px 100%);
}
.media__frame > img,
.media__frame > svg,
.media__frame > picture > img{
  display:block;width:100%;height:100%;object-fit:cover;
}
.media__cap{
  margin-top:10px;font-family:var(--font-mono);font-size:13px;
  letter-spacing:.04em;color:var(--ink-2);
}
.media--16x9 .media__frame{aspect-ratio:16 / 9}
.media--3x2 .media__frame{aspect-ratio:3 / 2}
.media--1x1 .media__frame{aspect-ratio:1 / 1}
.media--tall .media__frame{aspect-ratio:3 / 4}

/* 分段切换（同级分类） */
.tabs{display:block}
.tabs__list{
  display:flex;flex-wrap:wrap;gap:4px;list-style:none;
  margin:0 0 28px;padding:0 0 2px;
  border-bottom:1px solid var(--rule);
}
.tabs__tab{
  padding:10px 16px;
  font-family:var(--font-body);font-size:15px;line-height:1.4;color:var(--ink-2);
  border-bottom:2px solid transparent;
  transition:color 200ms var(--ease),border-color 200ms var(--ease),background-color 200ms var(--ease);
}
.tabs__tab:hover{color:var(--ink);background:rgba(31,78,107,.06)}
.tabs__tab[aria-selected="true"]{color:var(--ink);font-weight:600;border-bottom-color:var(--red)}
.tabs__panel:focus{outline:none}

/* 滚动显现 */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 520ms var(--ease),transform 520ms var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
[data-reveal].is-inview{opacity:1;transform:none}

/* ---------- 6. 头部外壳 ---------- */
.site-header{position:relative;z-index:80}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;
  background:var(--blue-deep);color:var(--on-dark);
  font-size:14px;border-radius:2px;
  transform:translateY(-180%);
  transition:transform 220ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}
@media (min-width:1024px){
  .skip-link{left:calc(var(--rail-w) + 14px)}
}

/* 移动端吸顶条 */
.topbar{
  position:sticky;top:0;z-index:82;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px 18px;
  background:var(--blue-deep);
  border-bottom:1px solid rgba(217,199,166,.28);
}
.topbar__brand{display:flex;flex-direction:column;gap:2px;color:var(--on-dark);text-decoration:none}
.topbar__mark{font-family:var(--font-head);font-size:17px;font-weight:600;letter-spacing:.16em;line-height:1.3}
.topbar__sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--on-dark-3)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;
  padding:9px 12px;
  border:1px solid rgba(217,199,166,.45);border-radius:2px;
  color:var(--on-dark);font-size:14px;letter-spacing:.1em;
  transition:background-color 200ms var(--ease),border-color 200ms var(--ease);
}
.nav-toggle:hover{background:rgba(247,241,230,.12);border-color:var(--on-dark-2)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:1.5px;background:currentColor;transition:transform 220ms var(--ease),opacity 160ms var(--ease)}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(38deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-38deg)}

.nav-scrim{
  position:fixed;inset:0;z-index:84;
  background:rgba(18,50,68,.6);
  opacity:0;visibility:hidden;
  transition:opacity 240ms var(--ease),visibility 240ms var(--ease);
}
.site-header[data-open] .nav-scrim{opacity:1;visibility:visible}

/* 轨道导航 */
.rail{
  position:fixed;top:0;left:0;bottom:0;z-index:86;
  display:flex;flex-direction:column;
  width:min(86vw,340px);
  padding:22px 18px 24px;
  background:linear-gradient(180deg,var(--blue-deep) 0%,var(--blue) 55%,var(--blue-deep) 100%);
  color:var(--on-dark);
  overflow-y:auto;
  transform:translateX(-102%);
  transition:transform 300ms var(--ease);
  box-shadow:0 0 60px rgba(18,50,68,.42);
}
.rail::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg, rgba(247,241,230,.05) 0 1px, rgba(247,241,230,0) 1px 26px);
}
.site-header[data-open] .rail{transform:translateX(0)}

.rail__brand{
  position:relative;
  display:flex;align-items:center;gap:12px;
  padding-bottom:18px;margin-bottom:18px;
  border-bottom:1px solid rgba(247,241,230,.2);
  color:var(--on-dark);text-decoration:none;
}
.rail__mark{font-family:var(--font-head);font-size:18px;font-weight:600;letter-spacing:.16em;line-height:1.25}
.rail__sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--on-dark-3)}

.rail__list{position:relative;list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.rail__item{display:block}
.rail__link{
  display:flex;align-items:center;gap:14px;
  padding:13px 12px;
  color:var(--on-dark-2);
  font-size:15px;letter-spacing:.08em;line-height:1.5;
  border-bottom:1px solid rgba(247,241,230,.1);
  transition:background-color 200ms var(--ease),color 200ms var(--ease);
}
.rail__link:hover{background:rgba(247,241,230,.1);color:var(--on-dark)}
.rail__num{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--on-dark-3);
}
.rail__label{display:block}
.rail__link:hover .rail__num{color:var(--on-dark)}
.rail__link[aria-current="page"]{
  color:var(--on-dark);
  background:rgba(247,241,230,.16);
  box-shadow:inset 3px 0 0 var(--red);
}
.rail__link[aria-current="page"] .rail__num{color:#E08C82}

.rail__foot{
  position:relative;
  display:flex;flex-direction:column;gap:12px;
  margin-top:auto;padding-top:22px;
  border-top:1px solid rgba(247,241,230,.2);
}
.rail__aside{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--on-dark-3);text-align:center;
}
.rail__aside:hover{color:var(--on-dark);text-decoration:underline;text-decoration-color:var(--red)}

/* 桌面：轨道常驻 */
@media (min-width:1024px){
  .topbar{display:none}
  .nav-scrim{display:none}
  .rail{
    width:var(--rail-w);
    padding:26px 8px 22px;
    align-items:center;
    transform:none;
    box-shadow:none;
  }
  .rail__brand{
    flex-direction:column;gap:14px;
    padding:0 0 20px;margin:0 0 20px;
    width:100%;align-items:center;
  }
  .rail__mark{writing-mode:vertical-rl;font-size:18px;letter-spacing:.3em}
  .rail__sub{writing-mode:vertical-rl;font-size:10px;letter-spacing:.24em}
  .rail__list{width:100%;align-items:center}
  .rail__link{
    flex-direction:column;gap:3px;
    padding:9px 4px;
    font-size:12px;letter-spacing:.12em;
    border-bottom:0;border-radius:2px;
    text-align:center;
  }
  .rail__num{font-size:10px}
  .rail__link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--red)}
  .rail__foot{width:100%}
  .rail__aside{font-size:10px;letter-spacing:.08em}
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(72px,10vw,140px);
  padding:clamp(48px,7vw,84px) 0 30px;
  background:linear-gradient(180deg,var(--blue-deep) 0%,#0E2836 100%);
  color:var(--on-dark-2);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--red) 0 var(--rail-w),var(--rule) var(--rail-w) 100%);
}
.footer__inner{
  width:100%;max-width:var(--page-max);margin-inline:auto;
  padding-inline:clamp(20px,4vw,48px);
  display:grid;grid-template-columns:1fr;gap:40px;
}
.footer__mark{
  font-family:var(--font-head);font-size:22px;font-weight:600;
  letter-spacing:.12em;color:var(--on-dark);line-height:1.4;
}
.footer__sub{
  margin-top:8px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.12em;color:var(--on-dark-3);
}
.footer__note{
  margin-top:16px;font-size:13.5px;line-height:1.8;color:var(--on-dark-3);max-width:46ch;
}
.footer__cols{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 24px;
}
.footer__coltitle{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--on-dark-3);margin-bottom:14px;
}
.footer__links{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer__link{
  font-size:15px;color:var(--on-dark-2);
  border-bottom:1px solid transparent;
  transition:color 200ms var(--ease),border-color 200ms var(--ease);
}
.footer__link:hover{color:#fff;border-bottom-color:var(--red)}

.footer__contact{
  display:grid;gap:10px;
  border-top:1px solid rgba(247,241,230,.16);
  padding-top:26px;
}
.footer__contact-item{display:flex;flex-wrap:wrap;gap:8px 16px;font-size:15px}
.footer__contact-key{
  flex:0 0 auto;min-width:76px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--on-dark-3);
  padding-top:2px;
}
.footer__contact-val{color:var(--on-dark);word-break:break-word}

.footer__legal{
  display:grid;gap:6px;
  border-top:1px solid rgba(247,241,230,.16);
  padding-top:20px;
}
.footer__legal-line{font-size:13px;color:var(--on-dark-3)}

@media (min-width:640px){
  .footer__cols{grid-template-columns:repeat(4,minmax(0,1fr))}
}
@media (min-width:900px){
  .footer__inner{
    grid-template-columns:minmax(0,1fr) minmax(0,2fr);
    gap:52px 72px;align-items:start;
  }
  .footer__brand{grid-column:1}
  .footer__cols{grid-column:2}
  .footer__contact{grid-column:1 / -1}
  .footer__legal{grid-column:1 / -1;grid-template-columns:1fr auto;align-items:center;gap:16px}
}

/* ---------- 8. 无障碍动效 ---------- */
@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}
}