/* =========================================================
   江南平台主站 — 共享样式表 /assets/site.css
   设计基准：数据叙事型布局 · 悬浮胶囊导航 · 江南矿物色体系
   ========================================================= */

/* ---------- 1. 令牌 ---------- */
:root{
  --c-indigo:#1C3B5A;
  --c-lake:#2E7FA8;
  --c-lotus:#8E7BB5;
  --c-gold:#C9932F;
  --c-cyan:#12D3C0;
  --c-amber:#F2A33C;
  --c-paper:#F7F3EA;
  --c-mist:#E3E6E4;
  --c-stone:#5C6B70;
  --c-night:#0F2027;
  --c-ink:#16232B;
  --c-text:#22333C;

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-head);
  --font-data:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --measure:36em;
  --container:1200px;
  --gutter:clamp(16px,4vw,32px);

  --radius-pill:999px;
  --radius-card:5px;
  --radius-lg:22px;

  --line:1px solid rgba(28,59,90,.20);
  --line-strong:1px solid rgba(28,59,90,.38);
  --line-dark:1px solid rgba(247,243,234,.18);

  --shadow-paper:0 1px 0 rgba(28,59,90,.10),7px 7px 0 rgba(28,59,90,.07);
  --shadow-lift:0 18px 40px rgba(15,32,39,.16);

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:240ms;
}

/* ---------- 2. 重置与基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:112px;
}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
a{color:var(--c-lake);text-decoration:none}
a:hover{text-decoration:underline}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--c-text);
  background-color:var(--c-paper);
  background-image:
    repeating-linear-gradient(to bottom,rgba(28,59,90,.035) 0 1px,transparent 1px 4px),
    radial-gradient(1200px 520px at 80% -10%,rgba(46,127,168,.14),transparent 70%),
    radial-gradient(900px 420px at 0% 8%,rgba(142,123,181,.10),transparent 72%);
  background-attachment:fixed,fixed,fixed;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;line-height:1.22;color:var(--c-indigo)}
h1{font-size:clamp(30px,5vw,44px)}
h2{font-size:clamp(24px,3.4vw,32px)}
h3{font-size:clamp(20px,2.4vw,24px)}
h4{font-size:18px}
p{line-height:1.75}
strong{font-weight:700;color:var(--c-indigo)}
::selection{background:rgba(18,211,192,.30);color:var(--c-night)}

:focus-visible{outline:3px solid var(--c-cyan);outline-offset:3px;border-radius:4px}

.mono{font-family:var(--font-data);letter-spacing:.03em}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 3. 布局骨架 ---------- */
.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(32px,5vw,64px)}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:18px;flex-wrap:wrap;
  padding-bottom:12px;margin-bottom:clamp(18px,3vw,30px);
  border-bottom:var(--line);
}
.section-title{font-size:clamp(22px,3vw,32px);font-weight:900;letter-spacing:-.02em;color:var(--c-indigo)}
.section-note{font-family:var(--font-data);font-size:12.5px;letter-spacing:.05em;color:var(--c-stone)}

.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(16px,2vw,28px)}
.rail{grid-column:span 3;min-width:0}
.main-col{grid-column:span 9;min-width:0}

.band{
  width:100%;
  padding-block:clamp(16px,2.6vw,26px);
  background:linear-gradient(100deg,var(--c-indigo),#17324C 55%,#12293D);
  color:rgba(247,243,234,.92);
  border-top:1px solid rgba(18,211,192,.55);
  border-bottom:1px solid rgba(201,147,47,.45);
}
.band h2,.band h3{color:var(--c-paper)}

.rule{height:1px;border:0;background:rgba(28,59,90,.16);margin-block:clamp(16px,2vw,24px)}
.prose{max-width:var(--measure);font-size:16px;color:var(--c-text)}
.prose p+p{margin-top:1em}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-data);font-size:12px;letter-spacing:.06em;color:var(--c-stone);
}
.breadcrumbs a{color:var(--c-lake)}
.breadcrumbs span[aria-hidden="true"]{color:rgba(92,107,112,.55)}

/* ---------- 4. 按钮与筛选胶囊 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-head);font-weight:700;font-size:15px;line-height:1;
  padding:12px 20px;border-radius:var(--radius-pill);
  border:1px solid transparent;text-decoration:none;cursor:pointer;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),
             color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:hover{text-decoration:none}
.btn--gold{background:var(--c-gold);color:#2A1D05;border-color:rgba(15,32,39,.18)}
.btn--gold:hover{background:#DCA63C;transform:translateY(-1px);box-shadow:0 8px 18px rgba(201,147,47,.32)}
.btn--ghost{background:transparent;color:var(--c-indigo);border-color:rgba(28,59,90,.35)}
.btn--ghost:hover{background:rgba(28,59,90,.07)}
.btn--cyan{background:var(--c-cyan);color:#062723;border-color:rgba(6,39,35,.18)}
.btn--cyan:hover{background:#35E2D2;transform:translateY(-1px)}
.btn--sm{padding:8px 15px;font-size:13px}

.chip-group{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  font-family:var(--font-data);font-size:12.5px;letter-spacing:.04em;
  padding:7px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(28,59,90,.22);background:rgba(255,255,255,.72);
  color:var(--c-indigo);cursor:pointer;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease),color var(--dur) var(--ease);
}
.chip:hover{border-color:var(--c-lake);background:#fff}
.chip[aria-pressed="true"],.chip.is-active{
  border-color:var(--c-cyan);background:rgba(18,211,192,.15);color:var(--c-indigo);
  box-shadow:0 0 0 3px rgba(18,211,192,.16);
}

/* ---------- 5. 纸张卡片 · 标签 · 数据件 ---------- */
.paper-card{
  position:relative;z-index:0;
  background:#fff;border:var(--line);border-radius:var(--radius-card);
  padding:clamp(18px,2.4vw,26px);
  box-shadow:var(--shadow-paper);
}
.paper-card--stack::before{
  content:"";position:absolute;z-index:-1;
  inset:12px -10px -10px 12px;
  background:var(--c-mist);border:var(--line);border-radius:var(--radius-card);
}

.tag{
  display:inline-block;
  font-family:var(--font-data);font-size:12px;letter-spacing:.05em;
  padding:3px 11px;color:var(--c-indigo);background:var(--c-mist);
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 9px,100% 100%,0 100%);
}
.tag--violet{background:rgba(142,123,181,.24);color:#4A3C6B}
.tag--gold{background:rgba(201,147,47,.22);color:#6B4E10}

.index-chip{
  display:inline-block;
  font-family:var(--font-data);font-size:11px;letter-spacing:.07em;
  padding:3px 9px;border-radius:3px;
  background:rgba(18,211,192,.16);color:#0A8C82;border:1px solid rgba(18,211,192,.42);
}
.index-chip--dark{
  background:rgba(247,243,234,.10);color:var(--c-gold);border-color:rgba(201,147,47,.45);
}

.metric{display:flex;flex-direction:column;gap:5px;min-width:0}
.metric__value{
  font-family:var(--font-data);font-weight:700;line-height:1;
  font-size:clamp(26px,3.4vw,40px);letter-spacing:.02em;color:var(--c-indigo);
}
.metric__value--cyan{color:#0A9B8E}
.metric__value--gold{color:#A97814}
.metric__label{font-size:12.5px;color:var(--c-stone);letter-spacing:.02em}

.stat-strip{
  display:flex;flex-wrap:wrap;gap:clamp(14px,2.4vw,32px);
  padding-block:14px;border-top:var(--line);border-bottom:var(--line);
}
.stat-strip>.metric{flex:1 1 120px}
.stat-strip>.metric+.metric{padding-left:clamp(14px,2.4vw,32px);border-left:1px dashed rgba(28,59,90,.22)}

.data-bar{
  position:relative;height:10px;border-radius:var(--radius-pill);
  background:rgba(28,59,90,.09);overflow:hidden;
}
.data-bar__fill{
  position:absolute;inset:0 auto 0 0;width:50%;
  border-radius:var(--radius-pill);
  background:linear-gradient(90deg,var(--c-cyan),#46E7D7);
  transition:width var(--dur) var(--ease);
}
.data-bar__fill--amber{background:linear-gradient(90deg,var(--c-amber),#FFC978)}
.data-bar__fill--gold{background:linear-gradient(90deg,var(--c-gold),#E6B34E)}

/* ---------- 6. 展开组 ---------- */
.fold{
  border:var(--line);border-radius:var(--radius-card);
  background:#fff;overflow:hidden;
}
.fold+.fold{margin-top:10px}
.fold summary{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:14px 18px;cursor:pointer;list-style:none;
  font-weight:700;color:var(--c-indigo);
}
.fold summary::-webkit-details-marker{display:none}
.fold summary::after{
  content:"＋";font-family:var(--font-data);font-size:15px;color:var(--c-gold);
  transition:transform var(--dur) var(--ease);
}
.fold[open] summary::after{content:"－"}
.fold[open] summary{border-bottom:var(--line);background:rgba(227,230,228,.42)}
.fold__body{padding:14px 18px 18px;color:var(--c-stone);font-size:15px}

/* ---------- 7. 图片容器基础规则（供页面阶段使用） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border:var(--line);border-radius:var(--radius-card);
  background:linear-gradient(135deg,rgba(28,59,90,.10),rgba(46,127,168,.20) 45%,rgba(201,147,47,.18));
  box-shadow:var(--shadow-paper);isolation:isolate;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(to bottom,rgba(255,255,255,.14) 0 1px,transparent 1px 5px);
  mix-blend-mode:overlay;
}
.media-frame>img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--band{aspect-ratio:16/6}
.media-frame--card{aspect-ratio:4/3}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__caption{
  position:absolute;left:12px;bottom:12px;z-index:2;
  font-family:var(--font-data);font-size:11.5px;letter-spacing:.05em;
  padding:5px 10px;border-radius:3px;
  background:rgba(15,32,39,.80);color:var(--c-paper);
}

/* ---------- 8. 页头：悬浮胶囊浮岛 ---------- */
.skip-link{
  position:absolute;left:50%;top:0;z-index:200;
  transform:translate(-50%,-150%);
  padding:10px 20px;border-radius:0 0 12px 12px;
  background:var(--c-indigo);color:var(--c-paper);
  font-weight:700;font-size:14px;text-decoration:none;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translate(-50%,0);text-decoration:none}

.site-header{
  position:sticky;top:0;z-index:60;
  padding:12px var(--gutter);
  transition:padding var(--dur) var(--ease);
}
.site-header[data-scrolled]{padding-block:6px}

.scroll-progress{
  position:fixed;top:0;left:0;z-index:70;
  width:100%;height:3px;pointer-events:none;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-lake) 45%,var(--c-gold));
}

.header-shell{
  position:relative;
  max-width:var(--container);margin-inline:auto;
  display:flex;align-items:center;gap:10px;
  padding:8px;border-radius:var(--radius-pill);
  background:rgba(247,243,234,.93);
  border:1px solid rgba(28,59,90,.16);
  box-shadow:0 10px 26px rgba(15,32,39,.10);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  transition:box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-header[data-scrolled] .header-shell{
  background:rgba(247,243,234,.98);
  box-shadow:0 6px 18px rgba(15,32,39,.16);
}

.brand-island{
  display:flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:5px 16px 5px 5px;border-radius:var(--radius-pill);
  background:var(--c-indigo);color:var(--c-paper);text-decoration:none;
  transition:background var(--dur) var(--ease);
}
.brand-island:hover{background:#17324C;text-decoration:none}
.brand-mark{
  display:grid;place-items:center;
  width:36px;height:36px;flex:0 0 auto;
  font-family:var(--font-head);font-weight:900;font-size:18px;line-height:1;
  color:#231704;background:linear-gradient(140deg,var(--c-gold),#E7BC61);
  border-radius:10px;
  clip-path:polygon(0 0,calc(100% - 11px) 0,100% 11px,100% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-family:var(--font-head);font-weight:900;font-size:15px;letter-spacing:.01em}
.brand-line{font-family:var(--font-data);font-size:10.5px;letter-spacing:.10em;color:rgba(247,243,234,.68)}

.nav-toggle{
  display:none;align-items:center;justify-content:center;flex:0 0 auto;
  width:44px;height:44px;margin-left:auto;
  border:1px solid rgba(28,59,90,.22);border-radius:var(--radius-pill);
  background:#fff;cursor:pointer;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.nav-toggle:hover{background:rgba(18,211,192,.12);border-color:var(--c-cyan)}
.nav-toggle-bars{
  position:relative;display:block;width:18px;height:2px;border-radius:2px;
  background:var(--c-indigo);
  transition:background var(--dur) var(--ease);
}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;
  background:var(--c-indigo);
  transition:transform var(--dur) var(--ease),top var(--dur) var(--ease);
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:6px;margin-left:auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.nav-link{
  position:relative;display:block;
  padding:9px 12px;border-radius:var(--radius-pill);
  font-size:14.5px;font-weight:500;color:var(--c-stone);
  white-space:nowrap;text-decoration:none;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-link:hover{color:var(--c-indigo);background:rgba(28,59,90,.07);text-decoration:none}
.nav-link[aria-current="page"]{
  color:var(--c-indigo);font-weight:700;background:rgba(18,211,192,.14);
}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;
  border-radius:2px;background:var(--c-cyan);
}

.nav-side{
  display:flex;align-items:center;gap:10px;margin-left:6px;padding-left:12px;
  border-left:1px dashed rgba(28,59,90,.22);
}
.nav-index{
  font-family:var(--font-data);font-size:11px;letter-spacing:.08em;
  padding:4px 10px;border-radius:var(--radius-pill);
  color:var(--c-stone);border:1px dashed rgba(28,59,90,.30);white-space:nowrap;
}

/* ---------- 9. 页脚：深水层 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,var(--c-indigo) 0%,#14314A 42%,var(--c-night) 100%);
  color:rgba(247,243,234,.82);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(to bottom,rgba(247,243,234,.05) 0 1px,transparent 1px 5px);
}
.footer-band{
  height:4px;
  background:linear-gradient(90deg,var(--c-cyan) 0%,var(--c-lake) 42%,var(--c-gold) 100%);
}
.footer-inner{position:relative;z-index:1;padding-block:clamp(36px,5vw,64px) clamp(20px,3vw,28px)}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr .85fr .85fr 1.25fr;
  gap:clamp(22px,3vw,40px);
}
.footer-wordmark{
  font-family:var(--font-head);font-weight:900;font-size:20px;letter-spacing:-.01em;
  color:var(--c-paper);
}
.footer-brand-text{
  margin-top:10px;max-width:32em;
  font-size:14px;line-height:1.72;color:rgba(247,243,234,.72);
}
.footer-index{
  margin-top:14px;font-family:var(--font-data);font-size:11.5px;
  letter-spacing:.06em;color:rgba(247,243,234,.60);
}
.footer-col{min-width:0}
.footer-col-title{
  font-size:13px;font-weight:700;letter-spacing:.14em;
  color:var(--c-cyan);
  padding-bottom:10px;margin-bottom:12px;
  border-bottom:var(--line-dark);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;color:rgba(247,243,234,.80);text-decoration:none;
  transition:color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.footer-link:hover{color:var(--c-gold);padding-left:4px;text-decoration:none}
.footer-contact{display:flex;flex-direction:column;gap:14px}
.footer-contact li{display:flex;flex-direction:column;gap:2px;min-width:0}
.footer-label{
  font-family:var(--font-data);font-size:11px;letter-spacing:.08em;
  color:rgba(247,243,234,.50);
}
.footer-value{
  font-size:13.5px;line-height:1.6;color:rgba(247,243,234,.90);
  overflow-wrap:anywhere;
}
.footer-meta{
  margin-top:clamp(28px,4vw,48px);padding-top:18px;
  border-top:var(--line-dark);
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
}
.footer-legal{font-size:12.5px;color:rgba(247,243,234,.62)}
.footer-legal--dim{color:rgba(247,243,234,.45)}

/* ---------- 10. 显现与动效协议 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 520ms var(--ease),transform 520ms var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1080px){
  .nav-index{display:none}
  .nav-link{padding-inline:10px;font-size:14px}
}

@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:calc(100% + 12px);
    display:none;flex-direction:column;align-items:stretch;gap:12px;
    margin:0;padding:16px;
    max-height:calc(100vh - 150px);overflow-y:auto;
    background:var(--c-paper);
    border:var(--line);border-radius:var(--radius-lg);
    box-shadow:var(--shadow-lift);
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:6px;width:100%}
  .nav-link{
    padding:13px 14px;border-radius:12px;font-size:16px;
    background:#fff;border:1px solid rgba(28,59,90,.10);
  }
  .nav-link[aria-current="page"]{
    background:rgba(18,211,192,.14);
    box-shadow:inset 3px 0 0 var(--c-cyan);
  }
  .nav-link[aria-current="page"]::after{display:none}
  .nav-side{
    width:100%;margin:0;padding:12px 0 0;
    border-left:0;border-top:1px dashed rgba(28,59,90,.22);
    justify-content:space-between;
  }
  .nav-side .btn{flex:1 1 auto}
}

@media (max-width:900px){
  .rail,.main-col{grid-column:1 / -1}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:640px){
  body{font-size:15px}
  .brand-line{display:none}
  .brand-mark{width:32px;height:32px;font-size:16px}
  .header-shell{border-radius:24px}
  .media-frame--band{aspect-ratio:16/9}
  .stat-strip>.metric+.metric{padding-left:0;border-left:0}
  .footer-grid{grid-template-columns:1fr}
  .footer-meta{flex-direction:column;gap:8px}
}

/* ---------- 12. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none}
}