/* ============================================================
   /assets/site.css — 乐投娱乐 · 江畔坐标 共享样式
   坐标：站点 04 / 板块 C / 序号 018
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;text-align:left}
img,svg{max-width:100%;display:block}
[hidden]{display:none!important}

/* ---------- tokens ---------- */
:root{
  --c-ink:#0B2A3A;
  --c-ink-deep:#061A26;
  --c-amber:#D9A441;
  --c-amber-bright:#F0C878;
  --c-cyan:#35E0C8;
  --c-mist:#7FA6A6;
  --c-fog:#F2F5F4;
  --c-paper:#FBF6EC;
  --c-indigo:#3A2E5C;
  --c-wine:#6E2135;
  --c-grid:#C9D4D2;

  --line:rgba(201,212,210,.20);
  --line-soft:rgba(201,212,210,.12);
  --shadow-deep:0 26px 54px -36px rgba(0,0,0,.95);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",Menlo,Consolas,monospace;
  --font-note:"LXGW WenKai","Kaiti SC",KaiTi,serif;

  --shell:1240px;
  --gutter:24px;
  --header-h:78px;
  --header-h-compact:64px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- base type ---------- */
body{
  background-color:var(--c-ink);
  background-image:repeating-linear-gradient(90deg,rgba(201,212,210,.045) 0 1px,transparent 1px 32px);
  color:var(--c-fog);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.3;
  letter-spacing:.14em;
  font-stretch:condensed;
}
p{line-height:1.85}
strong{color:var(--c-amber-bright);font-weight:700}

:where(a,button,[tabindex],summary):focus-visible{
  outline:2px solid var(--c-amber-bright);
  outline-offset:3px;
  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;
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-120px;z-index:300;
  padding:10px 18px;border-radius:2px;
  background:var(--c-amber);color:var(--c-ink-deep);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:14px}

/* ============================================================
   HEADER — 透明坐标轴，滚动后沉为实色
   ============================================================ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:linear-gradient(180deg,rgba(6,26,38,.78) 0%,rgba(6,26,38,.30) 62%,rgba(6,26,38,0) 100%);
  transition:background-color .32s var(--ease),box-shadow .32s var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,rgba(217,164,65,.55),rgba(53,224,200,.28) 48%,rgba(217,164,65,0));
  opacity:0;transition:opacity .32s var(--ease);
}
.site-header.is-solid{background-color:var(--c-ink);box-shadow:0 24px 46px -36px rgba(0,0,0,.95)}
.site-header.is-solid::after{opacity:1}
.site-header[data-open]{background-color:var(--c-ink-deep)}

.header-rail{
  position:absolute;top:0;left:0;right:0;height:2px;
  background-color:rgba(201,212,210,.10);
  background-image:repeating-linear-gradient(90deg,rgba(201,212,210,.32) 0 1px,transparent 1px 24px);
}
.header-rail__fill{
  display:block;height:100%;width:100%;transform-origin:0 50%;
  transform:scaleX(var(--scroll-progress,0));
  background:linear-gradient(90deg,var(--c-amber),var(--c-cyan));
  transition:transform .18s linear;
}

.header-inner{
  max-width:var(--shell);margin:0 auto;padding:0 var(--gutter);
  height:var(--header-h);display:flex;align-items:center;gap:22px;
  transition:height .32s var(--ease);
}
.site-header.is-solid .header-inner{height:var(--header-h-compact)}

/* brand + 罗盘标记 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{
  position:relative;display:block;flex:0 0 auto;
  width:36px;height:36px;border:1px solid rgba(217,164,65,.62);border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgba(53,224,200,.14),rgba(6,26,38,0) 70%);
}
.brand-mark::before,.brand-mark::after{content:"";position:absolute;background:rgba(201,212,210,.4)}
.brand-mark::before{left:50%;top:4px;bottom:4px;width:1px;margin-left:-.5px}
.brand-mark::after{top:50%;left:4px;right:4px;height:1px;margin-top:-.5px}
.brand-mark__needle{
  position:absolute;left:50%;top:50%;width:2px;height:12px;border-radius:1px;
  background:linear-gradient(180deg,var(--c-amber),var(--c-amber-bright));
  transform-origin:50% 100%;
  transform:translate(-50%,-100%) rotate(-18deg);
  animation:needle-drift 14s ease-in-out infinite;
}
@keyframes needle-drift{
  0%,100%{transform:translate(-50%,-100%) rotate(-22deg)}
  50%{transform:translate(-50%,-100%) rotate(26deg)}
}
.brand-text{display:flex;flex-direction:column;line-height:1.3}
.brand-title{font-family:var(--font-head);font-weight:800;font-size:16px;letter-spacing:.15em;color:var(--c-fog)}
.brand-coord{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--c-mist)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;margin-left:auto;align-items:center;gap:10px;
  padding:10px 14px;border:1px solid rgba(217,164,65,.5);border-radius:2px;
  color:var(--c-fog);font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
}
.nav-toggle:hover{border-color:var(--c-amber-bright);background:rgba(217,164,65,.12)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:1px;background:var(--c-amber);transition:transform .24s var(--ease),opacity .24s var(--ease)}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.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(-5px) rotate(-45deg)}

/* 导航主体 */
.site-nav{position:relative;margin-left:auto;display:flex;align-items:center;gap:26px}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{position:relative;display:flex;align-items:center}
.nav-link{
  position:relative;display:inline-block;padding:12px;
  font-family:var(--font-head);font-size:15px;font-weight:700;letter-spacing:.13em;
  color:var(--c-fog);transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:5px;height:1px;
  background:var(--c-amber);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--c-amber-bright)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--c-amber)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-code{
  position:absolute;left:50%;top:3px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;color:var(--c-amber);
  opacity:0;pointer-events:none;
  transform:translate(-50%,5px);
  transition:opacity .22s var(--ease),transform .22s var(--ease);
}
.nav-item[data-step] .nav-code{opacity:1;transform:translate(-50%,0)}

.nav-caret{
  display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;border:1px solid rgba(201,212,210,.28);border-radius:50%;
  transition:border-color .2s var(--ease),background-color .2s var(--ease),transform .24s var(--ease);
}
.nav-caret__glyph{
  width:7px;height:7px;
  border-right:1px solid var(--c-amber);border-bottom:1px solid var(--c-amber);
  transform:rotate(45deg) translate(-1px,-1px);
}
.nav-caret:hover{border-color:var(--c-amber);background:rgba(217,164,65,.14)}
.nav-item[data-step="2"] .nav-caret{transform:rotate(180deg);border-color:var(--c-amber-bright)}

.nav-panel{
  position:absolute;top:calc(100% + 8px);left:0;min-width:252px;z-index:6;
  padding:16px 18px;border-radius:3px;
  background:linear-gradient(155deg,rgba(58,46,92,.96),rgba(6,26,38,.99));
  border:1px solid rgba(217,164,65,.45);
  box-shadow:var(--shadow-deep);
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
}
.nav-panel::before{
  content:"";position:absolute;left:22px;top:-7px;width:11px;height:11px;
  background:rgba(58,46,92,.96);border-left:1px solid rgba(217,164,65,.45);border-top:1px solid rgba(217,164,65,.45);
  transform:rotate(45deg);
}
.nav-item[data-step="2"] .nav-panel{opacity:1;visibility:visible;transform:translateY(0)}
.nav-panel__coord{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--c-amber)}
.nav-panel__text{margin-top:6px;font-size:14px;line-height:1.7;color:var(--c-mist)}
.nav-item:nth-last-child(-n+2) .nav-panel{left:auto;right:0}
.nav-item:nth-last-child(-n+2) .nav-panel::before{left:auto;right:22px}

/* 工具条 */
.nav-utils{display:flex;align-items:center;gap:8px}
.util-chip{
  display:inline-block;padding:8px 12px;border:1px solid rgba(201,212,210,.26);border-radius:2px;
  font-size:13px;letter-spacing:.08em;color:var(--c-mist);
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.util-chip:hover{color:var(--c-fog);border-color:var(--c-amber);background:rgba(217,164,65,.10)}
.util-chip--hint{font-family:inherit}
.util-note{
  position:absolute;top:calc(100% + 14px);right:0;width:290px;z-index:6;
  padding:14px 16px;border-radius:3px;
  background:var(--c-ink-deep);border:1px solid rgba(53,224,200,.45);
  font-size:13px;line-height:1.7;color:var(--c-mist);box-shadow:var(--shadow-deep);
}

/* ============================================================
   通用按钮
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;border-radius:2px;border:1px solid transparent;
  font-family:var(--font-head);font-weight:700;font-size:15px;letter-spacing:.1em;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn--amber{background:var(--c-amber);border-color:var(--c-amber);color:var(--c-ink-deep)}
.btn--amber:hover{background:var(--c-amber-bright);border-color:var(--c-amber-bright)}
.btn--ghost{border-color:rgba(217,164,65,.6);color:var(--c-amber)}
.btn--ghost:hover{background:rgba(217,164,65,.12);color:var(--c-amber-bright)}
.btn--small{padding:9px 16px;font-size:13px;letter-spacing:.08em}

/* ============================================================
   FOOTER — 折向江面的河湾
   ============================================================ */
.site-footer{
  position:relative;margin-top:96px;overflow:hidden;
  background-color:var(--c-ink-deep);color:var(--c-mist);
  border-top:1px solid rgba(217,164,65,.32);
}
.footer-river{
  height:112px;
  background-image:
    linear-gradient(102deg,transparent 0 33%,rgba(53,224,200,.10) 33% 47%,transparent 47%),
    linear-gradient(102deg,transparent 0 45%,rgba(217,164,65,.18) 45% 62%,transparent 62%),
    linear-gradient(102deg,transparent 0 66%,rgba(58,46,92,.35) 66% 100%),
    repeating-linear-gradient(90deg,rgba(201,212,210,.14) 0 1px,transparent 1px 32px);
  border-bottom:1px dashed rgba(201,212,210,.16);
}
.footer-inner{
  max-width:var(--shell);margin:0 auto;padding:8px var(--gutter) 56px;
  display:grid;grid-template-columns:minmax(280px,1.05fr) 2fr;gap:48px;
}
.footer-brand__mark{
  position:relative;display:block;width:28px;height:28px;margin-bottom:18px;
  border:1px solid rgba(217,164,65,.62);border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgba(53,224,200,.14),rgba(6,26,38,0) 70%);
}
.footer-brand__mark::after{
  content:"";position:absolute;left:50%;top:50%;width:2px;height:10px;border-radius:1px;
  background:var(--c-amber);transform-origin:50% 100%;
  transform:translate(-50%,-100%) rotate(-22deg);
}
.footer-brand__name{font-family:var(--font-head);font-weight:800;font-size:17px;letter-spacing:.15em;color:var(--c-fog)}
.footer-brand__coord{margin-top:6px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--c-amber)}
.footer-brand__note{margin-top:16px;max-width:42ch;font-size:14px;line-height:1.8;color:var(--c-mist)}
.footer-brand__contact{margin-top:14px;display:flex;flex-direction:column;gap:5px}
.footer-contact__line{font-family:var(--font-mono);font-size:13px;letter-spacing:.05em;color:var(--c-fog)}
.footer-brand__address{
  margin-top:14px;padding-left:12px;max-width:34ch;
  border-left:1px solid rgba(217,164,65,.45);
  font-size:13px;line-height:1.8;color:var(--c-mist);
}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.footer-col__title{font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.2em;color:var(--c-amber)}
.footer-col__list{margin-top:18px;display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;padding-bottom:2px;font-size:15px;color:var(--c-fog);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{color:var(--c-amber-bright);border-color:rgba(240,200,120,.6)}
.footer-base{
  max-width:var(--shell);margin:0 auto;padding:24px var(--gutter) 44px;
  display:flex;flex-wrap:wrap;gap:16px 32px;align-items:center;justify-content:space-between;
  border-top:1px solid rgba(201,212,210,.16);
}
.footer-closing{font-family:var(--font-note);font-size:15px;color:var(--c-amber-bright)}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--c-mist);
}
.footer-legal__sep{color:rgba(201,212,210,.35)}

/* ============================================================
   LAYOUT
   ============================================================ */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.first-section{padding-top:calc(var(--header-h) + 48px)}
.section{position:relative;padding:80px 0}
.section--deep{background-color:var(--c-ink-deep)}
.section--paper{background-color:var(--c-paper);color:var(--c-ink)}
.section--paper .lede,.section--paper .archive-card__body{color:rgba(11,42,58,.78)}
.section-head{
  display:grid;grid-template-columns:72px minmax(0,1fr);gap:24px;align-items:start;
  margin-bottom:40px;
}
.section-index{font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;color:var(--c-amber);padding-top:10px}
.eyebrow{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--c-mist);text-transform:uppercase}
.section-title{margin-top:10px;font-size:clamp(28px,4vw,40px);color:var(--c-fog)}
.section--paper .section-title{color:var(--c-ink)}
.lede{margin-top:16px;max-width:62ch;font-size:17px;line-height:1.9;color:var(--c-mist)}
.stack{display:flex;flex-direction:column;gap:16px}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px}

/* ---------- 坐标标签 ---------- */
.coord-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 10px;border:1px solid rgba(217,164,65,.42);border-radius:2px;
  background:rgba(217,164,65,.08);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--c-amber);
}
.coord-num{font-family:var(--font-mono);color:var(--c-amber)}
.section--paper .coord-tag{border-color:rgba(11,42,58,.28);color:#8A6A1F;background:rgba(217,164,65,.14)}

/* ---------- 纵向坐标轴 ---------- */
.coord-rail{
  position:absolute;left:calc(var(--gutter) - 26px);top:0;bottom:0;width:1px;
  background:linear-gradient(180deg,transparent,rgba(201,212,210,.34) 12%,rgba(201,212,210,.34) 88%,transparent);
}
.coord-rail__tick{position:absolute;left:-4px;width:9px;height:1px;background:rgba(217,164,65,.6)}

/* ---------- 档案卡 ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:24px}
.archive-card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:26px 24px 24px;border-radius:3px;
  background:linear-gradient(160deg,rgba(58,46,92,.42),rgba(6,26,38,.78));
  border:1px solid var(--line);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.archive-card:hover{border-color:rgba(217,164,65,.62);transform:translateY(-3px)}
.archive-card__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--c-amber)}
.archive-card__title{font-family:var(--font-head);font-size:20px;font-weight:800;letter-spacing:.1em}
.archive-card__body{font-size:15px;line-height:1.8;color:var(--c-mist)}
.archive-card--wine{
  background:linear-gradient(160deg,rgba(110,33,53,.52),rgba(6,26,38,.82));
  border-color:rgba(240,200,120,.28);
}
.section--paper .archive-card{background:rgba(11,42,58,.04);border-color:rgba(11,42,58,.14)}

/* ---------- 折叠组 ---------- */
.fold{border:1px solid var(--line);border-radius:3px;background:rgba(6,26,38,.45);transition:border-color .22s var(--ease)}
.fold+.fold{margin-top:12px}
.fold__trigger{
  display:flex;align-items:center;gap:14px;width:100%;
  padding:16px 20px;color:var(--c-fog);
  font-family:var(--font-head);font-weight:700;font-size:16px;letter-spacing:.06em;
}
.fold__trigger::after{
  content:"";margin-left:auto;flex:0 0 auto;width:8px;height:8px;
  border-right:1px solid var(--c-amber);border-bottom:1px solid var(--c-amber);
  transform:rotate(45deg);transition:transform .22s var(--ease);
}
.fold.is-open{border-color:rgba(217,164,65,.62)}
.fold.is-open .fold__trigger::after{transform:rotate(-135deg)}
.fold__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--c-amber)}
.fold__panel{display:none;padding:0 20px 20px;font-size:15px;line-height:1.85;color:var(--c-mist)}
.fold.is-open .fold__panel{display:block}
.section--paper .fold{background:rgba(11,42,58,.03);border-color:rgba(11,42,58,.14)}
.section--paper .fold__trigger{color:var(--c-ink)}
.section--paper .fold__panel{color:rgba(11,42,58,.78)}

/* ---------- 时间轴 ---------- */
.timeline{position:relative;display:flex;flex-direction:column;gap:22px;padding-left:34px}
.timeline::before{
  content:"";position:absolute;left:8px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,rgba(53,224,200,.55),rgba(201,212,210,.18));
}
.timeline__item{position:relative}
.timeline__dot{
  position:absolute;left:-31px;top:10px;width:9px;height:9px;border-radius:50%;
  background:var(--c-cyan);box-shadow:0 0 0 4px rgba(53,224,200,.14);
}
.timeline__axis{display:block;margin-bottom:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--c-amber)}
.timeline__card{padding:18px 20px;border:1px solid var(--line);border-radius:3px;background:rgba(6,26,38,.5)}
.section--paper .timeline__card{background:#fff;border-color:rgba(11,42,58,.14)}

/* ---------- 表格 ---------- */
.coord-table-wrap{
  overflow-x:auto;border:1px solid var(--line);border-radius:3px;
  background:rgba(242,245,244,.03);
}
.coord-table{width:100%;min-width:560px;border-collapse:collapse;font-size:15px}
.coord-table caption{
  padding:16px 18px;text-align:left;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--c-amber);
}
.coord-table th,.coord-table td{
  height:40px;padding:10px 18px;text-align:left;
  border-bottom:1px solid var(--line-soft);vertical-align:middle;
}
.coord-table th{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--c-mist)}
.coord-table td:first-child{width:96px;font-family:var(--font-mono);color:var(--c-amber)}
.coord-table tr:last-child td{border-bottom:0}
.section--paper .coord-table-wrap{background:#fff;border-color:rgba(11,42,58,.16)}
.section--paper .coord-table th,.section--paper .coord-table td{border-color:rgba(11,42,58,.12);color:var(--c-ink)}
.section--paper .coord-table th{color:rgba(11,42,58,.6)}
.section--paper .coord-table td:first-child{color:#8A6A1F}

/* ---------- 筛选标签 ---------- */
.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border:1px solid rgba(201,212,210,.24);border-radius:999px;
  font-size:13px;letter-spacing:.08em;color:var(--c-mist);
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.chip:hover{color:var(--c-fog);border-color:rgba(217,164,65,.62)}
.chip[aria-pressed="true"],.chip.is-active{
  background:rgba(217,164,65,.16);border-color:var(--c-amber);color:var(--c-amber-bright);
}

/* ---------- 图文容器 ---------- */
.figure-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px}
.figure-frame{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:3px;
  background:linear-gradient(150deg,rgba(58,46,92,.42),rgba(6,26,38,.92));
}
.figure-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(rgba(201,212,210,.13) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,212,210,.13) 1px,transparent 1px);
  background-size:8px 8px;
}
.figure-frame__img{
  width:100%;aspect-ratio:16/10;object-fit:cover;
  filter:saturate(.74) contrast(1.06) hue-rotate(-8deg);
}
.figure-frame__cap{
  position:relative;z-index:1;padding:12px 16px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--c-mist);
}
.media-band{
  position:relative;overflow:hidden;border-radius:3px;
  background:linear-gradient(120deg,rgba(53,224,200,.14),rgba(217,164,65,.14));
  border:1px solid var(--line);
}

/* ---------- 批注与状态 ---------- */
.note-hand{
  padding-left:14px;border-left:2px solid rgba(217,164,65,.5);
  font-family:var(--font-note);font-size:15px;line-height:1.9;color:var(--c-amber-bright);
}
.pulse-dot{
  display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--c-cyan);
  box-shadow:0 0 0 0 rgba(53,224,200,.55);
  animation:pulse-ring 2.4s ease-out infinite;
}
@keyframes pulse-ring{
  0%{box-shadow:0 0 0 0 rgba(53,224,200,.55)}
  70%{box-shadow:0 0 0 12px rgba(53,224,200,0)}
  100%{box-shadow:0 0 0 0 rgba(53,224,200,0)}
}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--c-mist);
}
.crumbs__link{color:var(--c-mist);transition:color .2s var(--ease)}
.crumbs__link:hover{color:var(--c-amber)}
.crumbs__sep{color:rgba(201,212,210,.35)}
.crumbs [aria-current="page"]{color:var(--c-amber)}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .52s var(--ease),transform .52s var(--ease);
}
[data-reveal].is-revealed{opacity:1;transform:none}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .nav-utils .util-chip{display:none}
}

@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .header-inner{height:64px;gap:12px}
  .site-header.is-solid .header-inner{height:58px}

  .site-nav{
    position:fixed;top:64px;left:0;right:0;margin-left:0;
    max-height:calc(100vh - 64px);overflow-y:auto;
    display:block;padding:16px var(--gutter) 40px;
    background-color:var(--c-ink-deep);
    border-top:1px solid rgba(217,164,65,.35);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s var(--ease);
  }
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}

  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{
    flex-wrap:wrap;align-items:center;gap:0;
    padding:4px 0;border-bottom:1px solid var(--line-soft);
  }
  .nav-link{flex:1 1 auto;padding:14px 4px;font-size:16px}
  .nav-link::after{left:4px;right:auto;width:26px}
  .nav-code{
    position:static;display:none;transform:none;opacity:1;
    padding-right:10px;font-size:12px;
  }
  .nav-item[data-step] .nav-code{display:inline}
  .nav-caret{width:30px;height:30px;margin-right:4px}
  .nav-panel{
    position:static;display:none;width:100%;min-width:0;margin:0 0 12px;
    opacity:1;visibility:visible;transform:none;box-shadow:none;
  }
  .nav-panel::before{display:none}
  .nav-item[data-step="2"] .nav-panel{display:block}
  .nav-item:nth-last-child(-n+2) .nav-panel{left:0;right:0}

  .nav-utils{flex-direction:column;align-items:stretch;gap:10px;margin-top:24px}
  .nav-utils .util-chip{display:block;text-align:center;padding:12px;font-size:14px}
  .nav-utils .btn{width:100%}
  .util-note{position:static;width:auto;margin-top:14px}

  .section{padding:64px 0}
  .section-head{grid-template-columns:1fr;gap:8px}
  .section-index{padding-top:0}
  .footer-inner{grid-template-columns:1fr;gap:40px;padding-bottom:44px}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
}

@media (max-width:768px){
  body{font-size:16px}
  .section{padding:52px 0}
  .footer-river{height:72px}
  .footer-nav{grid-template-columns:1fr 1fr}
  .coord-rail{display:none}
  .footer-base{flex-direction:column;align-items:flex-start}
  .first-section{padding-top:calc(64px + 36px)}
}

@media (max-width:520px){
  .footer-nav{grid-template-columns:1fr}
  .brand-coord{font-size:10px;letter-spacing:.08em}
  .brand-mark{width:30px;height:30px}
  .footer-legal{font-size:11px}
}

/* ---------- 动效降级 ---------- */
@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}
  .header-rail__fill{transition:none}
}