/* =========================================================
   site.css · 果博东方中心 共享外壳
   资料馆索引体系：墨绿底 / 暖金刻度 / 瓷白阅读面
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;overflow-x:hidden}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#0E2A24;
  --ink-2:#17473B;
  --jade:#2F7A63;
  --gold:#C9A45C;
  --amber:#E0A458;
  --porcelain:#F7F3EA;
  --rice:#EFE8DA;
  --mist:#C9D8D2;
  --wine:#6E2F3A;
  --indigo:#2B2F55;

  --ink-08:rgba(14,42,36,.08);
  --ink-14:rgba(14,42,36,.14);
  --ink-55:rgba(14,42,36,.58);
  --porcelain-16:rgba(247,243,234,.16);
  --porcelain-70:rgba(247,243,234,.72);
  --porcelain-85:rgba(247,243,234,.86);
  --gold-22:rgba(201,164,92,.22);
  --gold-35:rgba(201,164,92,.35);
  --gold-60:rgba(201,164,92,.62);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"Inter","DIN Alternate","SFMono-Regular","Menlo",monospace;

  --wrap:1320px;
  --gutter:clamp(18px,4vw,56px);
  --header-h:96px;
  --radius-lg:26px;
  --radius-md:16px;
  --radius-sm:10px;
  --shadow-soft:0 22px 48px -30px rgba(14,42,36,.55);
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:200ms;
}

/* ---------- 3. Base typography ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:var(--porcelain);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.22;letter-spacing:.01em}
h1{font-size:clamp(2.4rem,5.4vw,4.25rem)}
h2{font-size:clamp(1.85rem,3.4vw,2.65rem)}
h3{font-size:clamp(1.22rem,1.9vw,1.6rem)}
h4{font-size:clamp(1.05rem,1.4vw,1.2rem)}
strong{font-weight:700}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* ---------- 4. Accessibility ---------- */
.skip-link{
  position:fixed;top:10px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  padding:.7em 1.5em;border-radius:999px;
  background:var(--gold);color:var(--ink);
  font-size:.9rem;font-weight:700;letter-spacing:.06em;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0)}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px}

/* ---------- 5. Layout helpers ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.page-top{padding-top:calc(var(--header-h) + clamp(26px,4vw,52px))}
.section{padding-block:clamp(42px,6vw,88px)}
.section--rice{background:var(--rice)}
.section--ink{background:var(--ink);color:var(--porcelain)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-num);font-size:.72rem;letter-spacing:.28em;
  text-transform:uppercase;color:var(--jade);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.8}
.section--ink .eyebrow{color:var(--gold)}
.lede{max-width:58ch;font-size:clamp(1rem,1.25vw,1.14rem);color:var(--ink-55)}
.section--ink .lede{color:var(--porcelain-70)}

/* ---------- 6. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.82em 1.65em;border-radius:999px;border:1px solid transparent;
  font-size:.94rem;font-weight:600;letter-spacing:.04em;line-height:1.3;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--ink-2);color:var(--porcelain)}
.btn--primary:hover{background:var(--jade)}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--amber)}
.btn--ghost{border-color:var(--ink-14);color:var(--ink-2);background:transparent}
.btn--ghost:hover{border-color:var(--gold);background:var(--gold-22)}
.btn--onDark{border-color:var(--porcelain-16);color:var(--porcelain);background:rgba(247,243,234,.05)}
.btn--onDark:hover{border-color:var(--gold);color:var(--gold)}
.btn--sm{padding:.55em 1.1em;font-size:.82rem}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* ---------- 7. Breadcrumbs ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-num);font-size:.75rem;letter-spacing:.1em;
  color:var(--ink-55);
}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li:not(:last-child)::after{content:"/";color:var(--gold);opacity:.8}
.crumbs a{color:var(--ink-55)}
.crumbs a:hover{color:var(--jade)}
.crumbs [aria-current="page"]{color:var(--ink-2);font-weight:600}

/* ---------- 8. Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  color:var(--porcelain);
  background:linear-gradient(180deg,rgba(14,42,36,.62),rgba(14,42,36,0));
  transition:background 260ms var(--ease),box-shadow 260ms var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--gold-35) 14%,var(--gold-35) 86%,transparent);
  transition:opacity 260ms var(--ease);
}
.site-header.is-solid{background:var(--ink-2);box-shadow:0 24px 44px -34px rgba(0,0,0,.85)}
.site-header.is-solid::after{opacity:.4}
.site-header[data-open]{background:var(--ink);box-shadow:0 26px 50px -30px rgba(0,0,0,.9)}

.header-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;z-index:2;
  pointer-events:none;background:rgba(247,243,234,.06);
}
.header-progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--amber));
  transition:transform 120ms linear;
}

.header-rule{
  display:flex;align-items:center;gap:14px;
  height:30px;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter);
  font-family:var(--font-num);font-size:.63rem;letter-spacing:.32em;
  text-transform:uppercase;color:var(--gold);
}
.rule-line{flex:1;height:1px;background:currentColor;opacity:.32}
.rule-label{white-space:nowrap;opacity:.9}

.header-inner{
  display:flex;align-items:center;gap:clamp(14px,2.2vw,34px);
  max-width:var(--wrap);margin-inline:auto;
  padding:10px var(--gutter) 14px;
  min-height:calc(var(--header-h) - 30px);
}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-seal{
  position:relative;display:grid;place-items:center;
  width:44px;height:44px;border:1px solid var(--gold-60);border-radius:5px;
  color:var(--gold);font-family:var(--font-display);font-size:1.14rem;font-weight:700;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.brand-seal::before{
  content:"";position:absolute;inset:4px;border:1px solid var(--gold-22);border-radius:2px;
}
.brand:hover .brand-seal{border-color:var(--gold);color:var(--amber)}
.brand-text{display:flex;flex-direction:column;line-height:1.26}
.brand-name{font-family:var(--font-display);font-size:1.1rem;font-weight:700;letter-spacing:.1em}
.brand-tag{font-size:.67rem;letter-spacing:.15em;color:var(--gold);opacity:.85}

.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.7vw,26px)}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-block;padding:8px 2px;
  font-size:.91rem;letter-spacing:.07em;color:var(--porcelain-85);
  transition:color var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:100%;bottom:2px;height:1px;
  background:var(--gold);transition:right 220ms var(--ease);
}
.nav-link:hover{color:var(--gold)}
.nav-link:hover::after{right:0}
.nav-link[aria-current="page"]{color:var(--gold);font-weight:600}
.nav-link[aria-current="page"]::after{right:0;background:var(--gold)}
.nav-link[aria-current="page"]::before{
  content:"";position:absolute;left:-10px;top:50%;width:4px;height:4px;
  border-radius:50%;background:var(--amber);transform:translateY(-50%);
}

.header-tools{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.tool-btn{
  display:inline-flex;align-items:center;gap:7px;
  padding:.5em .95em;border-radius:999px;
  border:1px solid var(--porcelain-16);
  background:rgba(247,243,234,.05);
  font-size:.8rem;letter-spacing:.07em;color:var(--porcelain-85);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),
             background var(--dur) var(--ease);
}
.tool-btn:hover{border-color:var(--gold-60);color:var(--gold);background:rgba(201,164,92,.12)}
.tool-icon{display:inline-flex;width:15px;height:15px;flex:0 0 auto}
.tool-icon svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.tool-text{white-space:nowrap;line-height:1}
.tool-search{padding-inline:.9em}
.tool-collect[aria-pressed="true"]{
  background:var(--gold);border-color:var(--gold);color:var(--ink);font-weight:700;
}
.tool-collect[aria-pressed="true"]:hover{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.tool-help{border-style:dashed}

.collect-hint{
  position:absolute;top:calc(100% + 8px);right:var(--gutter);z-index:3;
  padding:.5em 1.05em;border-radius:999px;
  background:var(--gold);color:var(--ink);
  font-size:.78rem;font-weight:700;letter-spacing:.03em;white-space:nowrap;
  opacity:0;transform:translateY(-6px);pointer-events:none;
  transition:opacity 180ms var(--ease),transform 180ms var(--ease);
}
.collect-hint.is-visible{opacity:1;transform:translateY(0)}

.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:44px;border-radius:12px;
  border:1px solid var(--porcelain-16);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold-60)}
.nav-toggle-bars{
  position:relative;display:block;width:18px;height:2px;background:currentColor;
  transition:background 180ms var(--ease);
}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform 220ms var(--ease);
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.site-header[data-open] .nav-toggle-bars{background:transparent}
.site-header[data-open] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- 9. Footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,8vw,110px);
  background:var(--ink);color:var(--porcelain);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--gold-60) 30%,var(--gold-60) 70%,transparent);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.2fr) minmax(0,1.9fr) minmax(0,1fr);
  gap:clamp(26px,4vw,54px);
  padding-block:clamp(44px,6vw,78px) clamp(30px,4vw,48px);
}
.footer-brand{display:flex;flex-direction:column;gap:13px}
.footer-seal{
  display:inline-grid;place-items:center;width:58px;height:58px;
  border:1px solid var(--gold-60);border-radius:6px;
  color:var(--gold);font-family:var(--font-display);font-size:.94rem;
  font-weight:700;letter-spacing:.1em;
}
.footer-name{font-family:var(--font-display);font-size:1.32rem;font-weight:700;letter-spacing:.15em}
.footer-summary{max-width:34ch;font-size:.92rem;line-height:1.8;color:var(--porcelain-70)}
.footer-note{
  font-family:var(--font-num);font-size:.7rem;letter-spacing:.16em;
  color:var(--gold);opacity:.82;
}
.footer-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,2.4vw,32px)}
.footer-group{min-width:0}
.footer-group-title{
  margin-bottom:14px;font-family:var(--font-body);
  font-size:.76rem;font-weight:600;letter-spacing:.2em;color:var(--gold);
}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{
  display:inline-block;font-size:.9rem;color:var(--porcelain-70);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-links a:hover{color:var(--gold);transform:translateX(3px)}
.footer-contact{min-width:0;display:flex;flex-direction:column;gap:8px}
.footer-line{font-size:.86rem;line-height:1.7;color:var(--porcelain-70);overflow-wrap:anywhere}
.footer-line--strong{color:var(--porcelain);font-family:var(--font-num);letter-spacing:.02em;font-size:.92rem}
.footer-line--muted{font-size:.76rem;line-height:1.7;color:rgba(247,243,234,.55)}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;padding-block:18px 28px;
  border-top:1px solid rgba(247,243,234,.12);
  font-size:.76rem;letter-spacing:.04em;color:rgba(247,243,234,.6);
}
.footer-legal{font-family:var(--font-num);letter-spacing:.06em}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal-links a{color:rgba(247,243,234,.72);transition:color var(--dur) var(--ease)}
.footer-legal-links a:hover{color:var(--gold)}

/* ---------- 10. Cards / tags / lists ---------- */
.card{
  display:flex;flex-direction:column;gap:10px;
  padding:clamp(18px,2.2vw,26px);
  background:var(--porcelain);
  border:1px solid var(--ink-14);border-radius:var(--radius-md);
  transition:transform 190ms var(--ease),box-shadow 190ms var(--ease),border-color 190ms var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-soft);border-color:var(--gold-60)}
.card--rice{background:var(--rice)}
.card--ink{background:var(--ink);color:var(--porcelain);border-color:rgba(247,243,234,.1)}
.card--ink:hover{border-color:var(--gold-60)}
.card-title{font-family:var(--font-display);font-size:1.2rem;font-weight:700;line-height:1.35}
.card-text{font-size:.94rem;line-height:1.75;color:var(--ink-55)}
.card--ink .card-text{color:var(--porcelain-70)}
.card-meta{
  font-family:var(--font-num);font-size:.72rem;letter-spacing:.16em;
  color:var(--jade);text-transform:uppercase;
}
.card--ink .card-meta{color:var(--gold)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:.28em .8em;border-radius:999px;
  background:var(--mist);color:var(--ink-2);
  font-size:.72rem;font-weight:600;letter-spacing:.1em;
}
.tag--gold{background:rgba(201,164,92,.32);color:#5c4718}
.tag--wine{background:var(--wine);color:var(--porcelain)}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  padding:.5em 1.1em;border-radius:999px;
  border:1px solid var(--ink-14);color:var(--ink-2);
  font-size:.82rem;letter-spacing:.06em;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.filter-btn:hover{border-color:var(--gold);background:var(--gold-22)}
.filter-btn[aria-pressed="true"]{background:var(--ink-2);border-color:var(--ink-2);color:var(--porcelain)}
.filter-empty{
  display:none;padding:22px 4px;
  font-size:.9rem;color:var(--ink-55);
  border-top:1px dashed var(--ink-14);
}
.filter-empty.is-visible{display:block}

.index-list{display:flex;flex-direction:column;border-top:1px solid var(--ink-14)}
.index-item{
  display:flex;align-items:baseline;gap:16px;
  padding:14px 4px;border-bottom:1px solid var(--ink-14);
  transition:background var(--dur) var(--ease);
}
.index-item:hover{background:rgba(201,164,92,.12)}
.index-num{
  flex:0 0 auto;min-width:3.4em;
  font-family:var(--font-num);font-size:.78rem;letter-spacing:.1em;
  color:var(--gold);font-variant-numeric:tabular-nums;
}
.note{
  padding:14px 18px;border-left:2px solid var(--gold);
  background:rgba(201,164,92,.1);
  font-size:.88rem;line-height:1.75;color:var(--ink-55);
}

/* ---------- 11. Media frames ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:var(--ratio,4/3);
  border:1px solid var(--ink-14);border-radius:var(--radius-md);
  background:var(--rice);
}
.media-frame img,.media-frame video{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:10px;pointer-events:none;
  border:1px solid var(--gold-35);border-radius:calc(var(--radius-md) - 7px);
  opacity:.75;
}
.media-frame--wide{--ratio:16/9}
.media-frame--tall{--ratio:3/4}
.media-frame--square{--ratio:1/1}
.media-frame--plate{--ratio:5/4;background:linear-gradient(140deg,var(--rice) 0%,var(--mist) 100%)}

/* ---------- 12. Grid ---------- */
.grid{display:grid;gap:clamp(14px,2vw,24px)}
.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))}

/* ---------- 13. Reveal ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity 520ms var(--ease),transform 520ms var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 14. Responsive ---------- */
@media (max-width:1120px){
  .brand-tag{display:none}
  .nav-link{font-size:.86rem}
  .tool-help{display:none}
}
@media (max-width:1024px){
  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,1.6fr)}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:960px){
  :root{--header-h:70px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;margin-left:0;
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    padding:8px var(--gutter) 24px;
    background:var(--ink);
    border-top:1px solid var(--gold-35);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity 200ms var(--ease),transform 200ms var(--ease),visibility 200ms;
  }
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{width:100%}
  .nav-link{
    display:block;width:100%;padding:15px 2px;
    border-bottom:1px solid rgba(247,243,234,.1);
    font-size:1rem;color:var(--porcelain);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]::before{left:auto;right:2px;top:50%}
  .header-inner{padding-block:8px 12px}
  .tool-text{display:none}
  .tool-search,.tool-collect{padding:.55em .8em}
  .tool-icon{width:16px;height:16px}
  .collect-hint{right:var(--gutter);left:var(--gutter);text-align:center}
  .footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  .header-rule{display:none}
  :root{--header-h:68px}
  .footer-top{grid-template-columns:minmax(0,1fr);gap:30px}
  .footer-meta{justify-content:flex-start}
}
@media (max-width:600px){
  body{font-size:16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .footer-groups{grid-template-columns:minmax(0,1fr);gap:24px}
  .index-item{flex-direction:column;gap:4px}
  .index-num{min-width:0}
  .btn{width:100%}
  .btn-row{gap:10px}
}

/* ---------- 15. Motion / print ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
  .header-progress-bar{transition:none}
}
@media print{
  .site-header,.site-footer,.skip-link{display:none}
  body{color:#000;background:#fff}
}