/* ==========================================================================
   EMC赛场 — 共享样式 /assets/site.css
   技术蓝图式网格 · 夜绿双色体系 · 直角细线
   ========================================================================== */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
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%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

/* ---------- 2. tokens ---------- */
:root {
  --green-900: #06120E;
  --green-700: #0C2419;
  --green-500: #123A28;
  --signal: #FF6A1A;
  --signal-soft: #FFA268;
  --white: #F4F8F6;
  --muted: #9DB3A9;
  --graphite: #1B231F;
  --amber: #E8C46A;
  --blue-gray: #5A7A88;
  --ink: #0A120E;

  --hairline: rgba(244, 248, 246, .075);
  --hairline-strong: rgba(244, 248, 246, .18);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --maxw: 1320px;
  --gutter: clamp(16px, 4vw, 40px);
  --gap: clamp(12px, 2vw, 24px);
  --header-h: 78px;
  --speed: 120ms;
}

/* ---------- 3. 中文排版基底 ---------- */
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background-color: var(--green-900);
  background-image:
    linear-gradient(to right, var(--hairline) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-weight: 300; line-height: 1.08; letter-spacing: -.02em; color: var(--white); }
h1 { font-size: clamp(34px, 6vw, 56px); }
h2 { font-size: clamp(26px, 4vw, 40px); }
h3 { font-size: clamp(20px, 2.6vw, 28px); }
h4 { font-size: 20px; letter-spacing: -.01em; }
strong, b { font-weight: 500; }
small { font-size: 12px; color: var(--muted); }

.is-mono,
[data-mono] { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: .02em; }

.index-num { font-family: var(--font-mono); font-size: 12px; color: var(--signal); letter-spacing: .14em; }

.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.1em; font-size: 15px; color: var(--muted); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--white); }

#main-content { display: block; }

/* ---------- 4. 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(40px, 7vw, 88px);
  border-top: 1px solid var(--hairline);
}
.section:first-child { border-top: 0; }

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--gap);
  align-items: end;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--signal);
  padding-bottom: 8px;
}
.section-title { max-width: 24ch; }
.section-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 58ch;
  margin-top: 10px;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.span-1 { grid-column: span 1; }
.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--signal);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  transition: top var(--speed) ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: .04em;
  color: var(--white);
  background: transparent;
  border: 1px solid var(--green-500);
  cursor: pointer;
  transition: color var(--speed) ease, border-color var(--speed) ease, background-color var(--speed) ease;
}
.btn-primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  font-weight: 500;
}
.btn-primary:hover,
.btn-primary:focus-visible { background: var(--signal-soft); border-color: var(--signal-soft); }
.btn-ghost:hover,
.btn-ghost:focus-visible { color: var(--signal); border-color: var(--signal); }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- 7. 头部外框 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--green-900);
  border-bottom: 1px solid var(--green-500);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 56px;
  height: 2px;
  background: var(--signal);
  pointer-events: none;
}

.header-inner {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  min-height: var(--header-h);
  padding: 10px var(--gutter);
  display: flex;
  align-items: center;
  gap: var(--gap);
  transition: min-height var(--speed) ease, padding var(--speed) ease;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  min-width: 0;
}
.brand-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  line-height: 1;
  color: var(--signal);
  border: 1px solid var(--signal);
  padding: 6px 7px;
}
.brand-body { display: flex; align-items: baseline; gap: 6px; }
.brand-name { font-size: 19px; font-weight: 400; letter-spacing: .05em; color: var(--white); }
.brand-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--signal-soft);
  border: 1px solid var(--green-500);
  padding: 3px 5px;
}
.brand-tag {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
  padding-left: 14px;
  margin-left: 2px;
  border-left: 1px solid var(--green-500);
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--gap);
  margin-left: auto;
}
.nav-list { display: flex; align-items: stretch; }
.nav-item { display: flex; }
.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 12px 14px;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: .03em;
  border-left: 1px solid var(--hairline);
  transition: color var(--speed) ease, background-color var(--speed) ease;
}
.nav-item:last-child .nav-link { border-right: 1px solid var(--hairline); }
.nav-link:hover,
.nav-link:focus-visible { color: var(--white); background: var(--green-700); }
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  top: 2px;
  width: 18px;
  height: 2px;
  background: var(--signal);
  opacity: 0;
  transition: opacity var(--speed) ease, width 160ms ease;
}
.nav-link:hover::after { opacity: .55; width: 10px; }
.nav-link[aria-current="page"] { color: var(--white); }
.nav-link[aria-current="page"]::after { opacity: 1; width: 24px; }
.nav-index { font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; color: var(--signal); }
.nav-label { white-space: nowrap; }

.nav-cta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: var(--gap);
  border-left: 1px solid var(--green-500);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: transparent;
  color: var(--white);
  border: 1px solid var(--green-500);
  cursor: pointer;
  font-size: 13px;
  letter-spacing: .1em;
  transition: color var(--speed) ease, border-color var(--speed) ease;
}
.nav-toggle:hover { color: var(--signal); border-color: var(--signal); }
.nav-toggle-bars { display: flex; flex-direction: column; gap: 3px; width: 14px; }
.nav-toggle-bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 160ms ease, opacity 120ms ease;
}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

/* 滚动进度刻线 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--green-500);
}
.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--signal);
  transition: width 120ms linear;
}

/* 收窄态 */
.site-header[data-stuck="true"] .header-inner { min-height: 62px; padding-block: 6px; }
.site-header[data-stuck="true"] .brand-tag { display: none; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--green-700);
  border-top: 1px solid var(--green-500);
  color: var(--white);
}
.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(32px, 6vw, 64px) var(--gutter) clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr) minmax(0, 1.2fr);
  gap: clamp(24px, 4vw, 56px);
}
.footer-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--signal);
}
.footer-wordmark {
  margin-top: 12px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 300;
  letter-spacing: .03em;
}
.footer-summary {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
.footer-cta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}
.footer-col { display: flex; flex-direction: column; }
.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .14em;
}
.footer-col-index { font-family: var(--font-mono); font-size: 11px; color: var(--signal); }
.footer-list { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.footer-list a {
  font-size: 14px;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color var(--speed) ease, border-color var(--speed) ease;
}
.footer-list a:hover,
.footer-list a:focus-visible { color: var(--signal); border-color: var(--signal); }

.contact-list { margin-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.contact-list li { display: flex; align-items: baseline; gap: 10px; font-size: 13px; line-height: 1.6; }
.contact-key { flex: 0 0 42px; font-size: 12px; letter-spacing: .12em; color: var(--blue-gray); }
.contact-val { color: var(--white); word-break: break-all; }

.footer-base {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--green-500);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  font-size: 12px;
  color: var(--muted);
}
.footer-legal { font-family: var(--font-mono); letter-spacing: .04em; }
.footer-legal-links { display: flex; flex-wrap: wrap; gap: 16px; margin-left: auto; }
.footer-legal-links a {
  color: var(--muted);
  border-bottom: 1px solid var(--green-500);
  transition: color var(--speed) ease, border-color var(--speed) ease;
}
.footer-legal-links a:hover,
.footer-legal-links a:focus-visible { color: var(--signal); border-color: var(--signal); }
.footer-note { flex-basis: 100%; color: var(--blue-gray); }

/* ---------- 9. 通用组件 ---------- */
.panel {
  background: var(--green-700);
  border: 1px solid var(--green-500);
  padding: clamp(16px, 2vw, 24px);
}
.panel-flat { background: var(--graphite); }
.hairline { border: 0; border-top: 1px solid var(--green-500); margin: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--signal);
  text-transform: uppercase;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  border: 1px solid var(--green-500);
}
.tag-live { color: var(--amber); border-color: rgba(232, 196, 106, .42); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--green-500);
  cursor: pointer;
  transition: color var(--speed) ease, border-color var(--speed) ease, background-color var(--speed) ease;
}
.chip:hover { color: var(--white); border-color: var(--hairline-strong); }
.chip[aria-pressed="true"],
.chip.is-active { color: var(--ink); background: var(--signal); border-color: var(--signal); }

/* 数据块 */
.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--green-500);
}
.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--white);
}
.stat-value-signal { color: var(--signal); }
.stat-label { font-size: 12px; letter-spacing: .12em; color: var(--muted); }

.meter {
  position: relative;
  height: 6px;
  background: var(--graphite);
  border: 1px solid var(--green-500);
}
.meter-fill {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--signal);
  transition: width 160ms ease;
}
.meter-fill-soft { background: var(--signal-soft); }

.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12px; color: var(--muted); }
.legend-item { display: flex; align-items: center; gap: 6px; }
.legend-swatch { width: 10px; height: 10px; background: var(--signal); }
.legend-swatch-soft { background: var(--signal-soft); }
.legend-swatch-muted { background: var(--blue-gray); }

/* 图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--graphite);
  border: 1px solid var(--green-500);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.9) contrast(1.06); }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(155deg, rgba(6, 18, 14, .62) 0%, rgba(6, 18, 14, .14) 46%, rgba(255, 106, 26, .22) 100%);
}
.media-frame-wide { aspect-ratio: 21 / 9; }
.media-frame-tall { aspect-ratio: 3 / 4; }
.media-frame-square { aspect-ratio: 1 / 1; }
.media-cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* 面包屑 */
.breadcrumb {
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.breadcrumb li { display: flex; align-items: center; gap: 10px; }
.breadcrumb li + li::before { content: "//"; color: var(--signal); opacity: .65; }
.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--signal); }
.breadcrumb [aria-current="page"] { color: var(--white); }

/* ---------- 10. 显现动效 ---------- */
html[data-reveal-ready] [data-reveal] { opacity: 0; transform: translateY(10px); }
html[data-reveal-ready] [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 320ms ease, transform 320ms ease;
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1180px) {
  .brand-tag { display: none; }
  .nav-link { padding: 12px 10px; font-size: 14px; }
  .nav-cta { padding-left: 12px; }
  .nav-cta .btn { padding: 9px 12px; font-size: 13px; }
}

@media (max-width: 1000px) {
  :root { --header-h: 60px; }
  body.nav-open { overflow: hidden; }

  .header-inner { padding: 8px var(--gutter); gap: 12px; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .brand-tag { display: none; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: block;
    margin-left: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 8px var(--gutter) 28px;
    background: var(--green-900);
    border-top: 1px solid var(--green-500);
    border-bottom: 1px solid var(--green-500);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 140ms ease, transform 140ms ease, visibility 140ms ease;
  }
  .site-nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; }

  .nav-list { flex-direction: column; }
  .nav-item { display: block; }
  .nav-link {
    padding: 14px 4px;
    font-size: 17px;
    border-left: 0;
    border-bottom: 1px solid var(--hairline);
  }
  .nav-item:last-child .nav-link { border-right: 0; }
  .nav-link::after { left: 4px; top: 8px; }
  .nav-link:hover { background: transparent; }

  .nav-cta {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 18px;
    padding: 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--green-500);
  }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-summary { max-width: 100%; }
}

@media (max-width: 860px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-7, .span-8, .span-9, .span-10, .span-12 { grid-column: span 6; }
  .span-5, .span-6 { grid-column: span 6; }
  .span-4 { grid-column: span 3; }
  .span-3 { grid-column: span 3; }
  .span-2 { grid-column: span 2; }
  .span-1 { grid-column: span 1; }
}

@media (max-width: 640px) {
  .section { padding-block: clamp(32px, 9vw, 56px); }
  .section-head { grid-template-columns: minmax(0, 1fr); align-items: start; gap: 6px; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .footer-legal-links { margin-left: 0; }
  .brand-name { font-size: 17px; }
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-12 > [class*="span-"] { grid-column: span 2; }
}

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