/* ==========================================================================
   王电子中心 · 共享站点样式  /assets/site.css
   设计基线：雾白底 + 刻度网格 / 堆叠面板 / 悬浮胶囊导航 / 实验室档案感
   ========================================================================== */

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

body,
h1, h2, h3, h4, h5, h6,
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, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

/* ---------- 设计令牌 ---------- */
:root {
  /* 色彩 */
  --c-signal: #0A5CFF;   /* 信号蓝 */
  --c-ink:    #0A2A66;   /* 深蓝墨 */
  --c-graphite:#14181F;  /* 石墨黑 */
  --c-silver: #D9DEE6;   /* 冷银灰 */
  --c-mist:   #F5F7FB;   /* 雾白 */
  --c-white:  #FFFFFF;
  --c-amber:  #F2A93B;   /* 琥珀警示 */
  --c-green:  #22C08A;   /* 状态绿 */
  --c-red:    #D94A3D;   /* 警示红 */
  --c-gray:   #6B7280;   /* 中灰 */
  --c-body:   #2A3140;   /* 正文次级 */
  --c-soft:   #39424F;   /* 长文段落 */

  --line:        rgba(20, 24, 31, .12);
  --line-strong: rgba(10, 42, 102, .22);

  /* 字体 */
  --f-head: "Inter Tight", "思源黑体", "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --f-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", "Roboto Mono", Consolas, "SFMono-Regular", ui-monospace, monospace;

  /* 形状与节奏 */
  --r-lg: 14px;
  --r-sm: 4px;
  --r-pill: 999px;
  --cut: 14px 14px 14px 4px;

  --w-page: 1240px;
  --gap-panel: 24px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --t-fast: 140ms var(--ease);
  --t-base: 200ms var(--ease);
}

/* ---------- 基础排版 ---------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
  -webkit-text-size-adjust: 100%;
}

body {
  padding-top: 112px;
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-graphite);
  background-color: var(--c-mist);
  background-image:
    repeating-linear-gradient(to right, rgba(10, 42, 102, .028) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(to bottom, rgba(10, 42, 102, .028) 0 1px, transparent 1px 32px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--f-head);
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.16;
  color: var(--c-graphite);
}

h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.15rem; }

h2 + p, h3 + p { margin-top: .6em; }

a { text-decoration: none; }

p a, li a { color: var(--c-ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
p a:hover, li a:hover { color: var(--c-signal); }

strong { font-weight: 700; color: var(--c-graphite); }

:focus-visible {
  outline: 2px solid var(--c-signal);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ---------- 通用工具 ---------- */
.container { width: min(var(--w-page), 100% - 40px); margin-inline: auto; }

.mono {
  font-family: var(--f-mono);
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-gray);
  display: inline-block;
}

.section-title { font-size: 1.6rem; margin-bottom: .5em; }

.lede { font-size: 18px; line-height: 1.8; color: var(--c-soft); max-width: 40em; }

.num-xl {
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 40px);
  letter-spacing: .02em;
  line-height: 1.05;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}

.divider { height: 1px; background: var(--line); border: 0; }

.stack { display: flex; flex-direction: column; gap: var(--gap-panel); }

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--c-graphite);
  color: #fff;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 14px;
  border-radius: var(--r-sm);
  transition: top var(--t-base);
}
.skip-link:focus { top: 12px; }

/* ---------- 状态标记 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border: 1px solid currentColor;
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.7;
  white-space: nowrap;
}
.badge--test   { color: #8A5A0B; background: rgba(242, 169, 59, .15); border-color: rgba(242, 169, 59, .55); }
.badge--notice { color: var(--c-ink); background: rgba(10, 92, 255, .10); border-color: rgba(10, 92, 255, .34); }
.badge--ok     { color: #0E7A57; background: rgba(34, 192, 138, .12); border-color: rgba(34, 192, 138, .48); }
.badge--amber  { color: #8A5A0B; background: rgba(242, 169, 59, .16); border-color: rgba(242, 169, 59, .55); }

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
  animation: ledBreathe 2.4s var(--ease) infinite;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--cut);
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--t-fast), background-color var(--t-fast),
              border-color var(--t-fast), color var(--t-fast);
}

.btn--primary {
  background: var(--c-signal);
  border-color: var(--c-signal);
  color: #fff;
}
.btn--primary:hover { background: var(--c-ink); border-color: var(--c-ink); transform: translateY(-2px); }

.btn--ghost {
  background: transparent;
  border-color: var(--c-silver);
  color: var(--c-ink);
}
.btn--ghost:hover { border-color: var(--c-signal); color: var(--c-signal); transform: translateY(-2px); }

.btn--sm { min-height: 44px; padding: 0 16px; font-size: 13px; border-radius: 10px 10px 10px 4px; }

/* ==========================================================================
   头部
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  padding: 14px 0 0;
  transition: padding var(--t-base);
}

.header-island {
  position: relative;
  width: min(var(--w-page), 100% - 32px);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 12px 10px 18px;
  background: rgba(255, 255, 255, .86);
  border: 1px solid var(--line);
  border-radius: 20px 20px 20px 6px;
  -webkit-backdrop-filter: blur(10px) saturate(1.15);
  backdrop-filter: blur(10px) saturate(1.15);
  box-shadow: 0 14px 34px -28px rgba(10, 42, 102, .6);
  transition: padding var(--t-base), background-color var(--t-base),
              border-color var(--t-base), box-shadow var(--t-base);
}

.site-header.is-condensed { padding-top: 8px; }
.site-header.is-condensed .header-island {
  background: rgba(255, 255, 255, .96);
  border-color: var(--line-strong);
  padding: 8px 10px 8px 16px;
  box-shadow: 0 18px 40px -30px rgba(10, 42, 102, .75);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--c-graphite);
}

.brand-leds { display: inline-flex; flex-direction: column; gap: 3px; }

.led { display: block; width: 6px; height: 6px; border-radius: 50%; }
.led--blue  { background: var(--c-signal); }
.led--green { background: var(--c-green); animation: ledBreathe 2.4s var(--ease) infinite; }
.led--amber { background: var(--c-amber); }

.brand-text { display: flex; flex-direction: column; line-height: 1.05; }

.brand-name {
  font-family: var(--f-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .06em;
}

.brand-sub { font-size: 10px; letter-spacing: .12em; color: var(--c-gray); }

/* 导航 */
.site-nav { margin-left: auto; }

.nav-list { display: flex; align-items: center; gap: 2px; }

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--r-pill);
  font-family: var(--f-head);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--c-body);
  white-space: nowrap;
  transition: background-color var(--t-fast), color var(--t-fast);
}

.nav-link:hover { background: rgba(10, 92, 255, .09); color: var(--c-ink); }

.nav-link[aria-current="page"] {
  background: var(--c-signal);
  color: #fff;
  box-shadow: 0 8px 18px -12px rgba(10, 92, 255, .95);
}
.nav-link[aria-current="page"]:hover { background: var(--c-ink); }

/* 头部操作 */
.header-actions { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 14px 0 12px;
  background: var(--c-white);
  border: 1px solid var(--c-silver);
  border-radius: 12px 12px 12px 4px;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-graphite);
  cursor: pointer;
  transition: border-color var(--t-fast), color var(--t-fast);
}
.nav-toggle:hover { border-color: var(--c-signal); color: var(--c-signal); }

.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--t-base), opacity var(--t-base);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 滚动进度刻度 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  z-index: 70;
  background: linear-gradient(90deg, var(--c-signal), #4A8CFF 62%, var(--c-green));
  transition: width 90ms linear;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  margin-top: 96px;
  padding: 0 0 28px;
  background: var(--c-white);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  display: block;
  height: 7px;
  margin-bottom: 26px;
  background-image: repeating-linear-gradient(to right,
    var(--c-silver) 0 1px, transparent 1px 12px);
  background-position: center top;
  background-size: 100% 7px;
  background-repeat: no-repeat;
}

/* 订阅条 */
.sub-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  padding: 22px 26px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-signal);
  border-radius: var(--cut);
  background-color: var(--c-mist);
  background-image:
    radial-gradient(120% 200% at 0% 0%, rgba(10, 92, 255, .12), transparent 62%),
    radial-gradient(120% 200% at 100% 100%, rgba(242, 169, 59, .13), transparent 62%);
}

.sub-strip__lead { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.sub-strip__title { font-size: 1.15rem; letter-spacing: .02em; }

.sub-strip__side { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.sub-strip__mail { font-size: 13px; color: var(--c-gray); }

/* 页脚四列 */
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: 44px 32px;
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line);
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin-bottom: 16px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-gray);
}

.footer-brand {
  font-family: var(--f-head);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--c-graphite);
  margin-bottom: 12px;
}

.footer-note {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-gray);
  max-width: 34ch;
}
.footer-note + .footer-note { margin-top: 8px; }

.footer-list { display: grid; gap: 10px; }

.footer-list a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--c-graphite);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.footer-list a:hover { color: var(--c-signal); border-color: var(--c-signal); }

/* 联系与复制 */
.footer-list--contact { gap: 14px; }

.contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
}

.contact-label {
  flex: 0 0 100%;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-gray);
}

.contact-value { font-size: 14px; color: var(--c-graphite); word-break: break-all; }
.contact-value--addr { font-size: 13.5px; line-height: 1.7; color: var(--c-soft); }

.copy-btn {
  min-height: 30px;
  padding: 0 10px;
  background: var(--c-mist);
  border: 1px solid var(--c-silver);
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-gray);
  cursor: pointer;
  transition: border-color var(--t-fast), color var(--t-fast), background-color var(--t-fast);
}
.copy-btn:hover { border-color: var(--c-signal); color: var(--c-signal); background: rgba(10, 92, 255, .07); }
.copy-btn[data-copied] { border-color: var(--c-green); color: #0E7A57; background: rgba(34, 192, 138, .12); }

/* 页脚底栏 */
.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 24px;
  font-size: 12.5px;
  color: var(--c-gray);
}
.footer-base__legal { letter-spacing: .06em; }
.footer-base__meta { max-width: 60ch; }

/* ==========================================================================
   通用页面组件
   ========================================================================== */
.panel {
  padding: 28px;
  background: var(--c-white);
  border: 1px solid var(--line);
  border-radius: var(--cut);
  transition: transform var(--t-base), border-color var(--t-base),
              box-shadow var(--t-base);
}

.panel--lift:hover {
  transform: translateY(-2px);
  border-color: var(--c-signal);
  box-shadow: 0 20px 40px -34px rgba(10, 42, 102, .7);
}

.prose { max-width: 44em; color: var(--c-soft); }
.prose p { margin-bottom: 1.2em; }
.prose p:last-child { margin-bottom: 0; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.4em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: .5em; }
.prose h2 { margin: 1.6em 0 .6em; color: var(--c-graphite); }
.prose h3 { margin: 1.4em 0 .5em; color: var(--c-graphite); }

.breadcrumb { margin-bottom: 26px; font-size: 13px; color: var(--c-gray); }
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li:not(:last-child)::after { content: "/"; color: var(--c-silver); }
.breadcrumb a { color: var(--c-gray); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-signal); }
.breadcrumb [aria-current="page"] { color: var(--c-graphite); font-weight: 600; }

.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 32px; }
.col-3  { grid-column: span 3; }
.col-4  { grid-column: span 4; }
.col-6  { grid-column: span 6; }
.col-8  { grid-column: span 8; }
.col-9  { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.side-rail { position: sticky; top: 128px; align-self: start; }

/* ---------- 图片容器 ---------- */
.figure {
  margin: 0;
  overflow: hidden;
  background: var(--c-white);
  border: 1px solid var(--line);
  border-radius: var(--cut);
}

.figure__media {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: #EDF1F7;
  background-image:
    linear-gradient(to right, rgba(10, 42, 102, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(10, 42, 102, .07) 1px, transparent 1px);
  background-size: 22px 22px;
}

.figure__media--wide   { aspect-ratio: 16 / 10; }
.figure__media--tall   { aspect-ratio: 3 / 4; }
.figure__media--square { aspect-ratio: 1 / 1; }

.figure__media img { width: 100%; height: 100%; object-fit: cover; }

.figure__ph {
  padding: 6px 12px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, .78);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #8A94A3;
  text-align: center;
}

.figure__cap {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ---------- 可展开内容组 ---------- */
.accordion {
  overflow: hidden;
  background: var(--c-white);
  border: 1px solid var(--line);
  border-radius: var(--cut);
}

.accordion__item + .accordion__item { border-top: 1px solid var(--line); }

.accordion__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  min-height: 58px;
  padding: 14px 20px;
  background: none;
  border: 0;
  text-align: left;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--c-graphite);
  cursor: pointer;
  transition: background-color var(--t-fast), color var(--t-fast);
}
.accordion__trigger:hover { background: rgba(10, 92, 255, .05); color: var(--c-ink); }

.accordion__index {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-signal);
}

.accordion__chev {
  flex: 0 0 auto;
  margin-left: auto;
  width: 13px;
  height: 13px;
  border-right: 2px solid var(--c-gray);
  border-bottom: 2px solid var(--c-gray);
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--t-base), border-color var(--t-base);
}
.accordion__trigger[aria-expanded="true"] .accordion__chev {
  transform: rotate(-135deg) translateY(-2px);
  border-color: var(--c-signal);
}

.accordion__panel { padding: 0 20px 22px; font-size: 15.5px; line-height: 1.78; color: var(--c-soft); }
.accordion__panel[hidden] { display: none; }
.accordion__panel:not([hidden]) { animation: panelIn 220ms var(--ease) both; }

/* ---------- 动效关键帧 ---------- */
@keyframes ledBreathe {
  0%, 100% { opacity: 1; }
  50%      { opacity: .38; }
}

@keyframes panelIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1100px) {
  body { padding-top: 96px; }
  html { scroll-padding-top: 118px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    margin-left: 0;
    padding: 10px;
    background: var(--c-white);
    border: 1px solid var(--line);
    border-radius: 16px 16px 16px 4px;
    box-shadow: 0 26px 52px -34px rgba(10, 42, 102, .7);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--t-base), transform var(--t-base), visibility var(--t-base);
  }

  .site-nav[data-open] { opacity: 1; visibility: visible; transform: none; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    justify-content: flex-start;
    padding: 0 14px;
    border-radius: 10px;
    font-size: 15px;
  }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px 32px; }

  .grid-12 { gap: 24px; }
  .col-3, .col-4, .col-8, .col-9 { grid-column: span 12; }
  .col-6 { grid-column: span 12; }
  .side-rail { position: static; top: auto; }
}

@media (max-width: 760px) {
  body { font-size: 16.5px; }

  .container { width: min(var(--w-page), 100% - 28px); }

  .header-island { gap: 12px; padding: 8px 10px 8px 14px; }
  .brand-sub { display: none; }
  .brand-name { font-size: 16px; }

  .panel { padding: 20px; }

  .sub-strip { padding: 18px; }
  .sub-strip__title { font-size: 1.05rem; }
  .sub-strip__side { width: 100%; justify-content: space-between; }
  .sub-strip__mail { font-size: 12px; word-break: break-all; }

  .footer-grid { grid-template-columns: 1fr; gap: 34px; padding: 40px 0 32px; }
  .footer-list--contact { gap: 16px; }
  .footer-base { flex-direction: column; align-items: flex-start; gap: 8px; }

  .figure__media--wide { aspect-ratio: 4 / 3; }
}

@media (max-width: 460px) {
  .header-actions .btn--sm { padding: 0 12px; font-size: 12px; }
  .nav-toggle-label { display: none; }
  .nav-toggle { padding: 0 12px; }
  .num-xl { font-size: 28px; }
}

/* ==========================================================================
   无障碍与动效降级
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .panel--lift:hover,
  .btn:hover { transform: none; }

  .scroll-progress { transition: none; }
}