:root {
  --graphite-900: #111418;
  --graphite-800: #1B2026;
  --graphite-700: #232A32;
  --paper: #F4E9D8;
  --paper-ink: #251C16;
  --blue: #0B5ED7;
  --cyan: #16E0FF;
  --orange: #FF5A1F;
  --yellow: #FFD23F;
  --mist: #AEB7C2;
  --red: #E23A2E;
  --text: #E6EAEF;
  --text-dim: #AEB7C2;
  --line: rgba(174, 183, 194, 0.18);
  --line-blue: rgba(11, 94, 215, 0.45);
  --font-display: "Barlow Condensed", "Roboto Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --header-h: 76px;
  --track-h: 26px;
  --maxw: 1280px;
  --maxw-wide: 1480px;
  --pad-x: clamp(16px, 3.2vw, 40px);
  --cut: 16px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 200ms;
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  padding-top: calc(var(--header-h) + var(--track-h));
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
  background:
    radial-gradient(900px 520px at 82% -8%, rgba(11, 94, 215, 0.28), transparent 70%),
    radial-gradient(680px 420px at 2% 6%, rgba(22, 224, 255, 0.10), transparent 70%),
    var(--graphite-900);
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(11, 94, 215, 0.55), rgba(11, 94, 215, 0.08) 45%, rgba(22, 224, 255, 0.28));
  pointer-events: none;
  z-index: 3;
}
body::before { left: clamp(8px, 2.4vw, 28px); }
body::after { right: clamp(8px, 2.4vw, 28px); }

img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
button { font: inherit; }
h1, h2, h3, h4, p, figure, blockquote { margin: 0; }
ul[class], ol[class] { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--paper);
  font-weight: 700;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

#main-content { scroll-margin-top: calc(var(--header-h) + var(--track-h) + 12px); }

/* ---------- 布局基础 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}
.container--wide { max-width: var(--maxw-wide); }

.section { padding: clamp(40px, 6vw, 88px) 0; }
.section--paper {
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(32px, 4.5vw, 64px) clamp(20px, 3vw, 44px);
  border-left: 3px solid var(--blue);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 34px 100%, 0 calc(100% - 34px));
}
.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: var(--paper-ink); }

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }

.hairline {
  height: 0;
  border: 0;
  border-top: 1px solid var(--line);
  margin: clamp(16px, 2vw, 26px) 0;
}

.speed-rule {
  height: 8px;
  margin: clamp(20px, 3vw, 36px) 0;
  background: repeating-linear-gradient(115deg, rgba(22, 224, 255, 0.85) 0 2px, transparent 2px 11px);
  opacity: 0.55;
}

/* ---------- 索引与文本组件 ---------- */
.eyebrow {
  display: inline-block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  line-height: 1.6;
  color: var(--cyan);
  text-transform: uppercase;
}
.panel-paper .eyebrow,
.section--paper .eyebrow { color: var(--blue); }

.coord {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--yellow);
  line-height: 1.6;
}

.badge-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  padding: 0 6px;
  background: var(--orange);
  color: #160F0B;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.panel-paper {
  position: relative;
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(22px, 3vw, 38px);
  border-left: 3px solid var(--blue);
  box-shadow: 12px 12px 0 rgba(11, 94, 215, 0.16);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}
.panel-paper h1,
.panel-paper h2,
.panel-paper h3,
.panel-paper h4 { color: var(--paper-ink); }
.panel-paper p { color: var(--paper-ink); }
.panel-paper a { color: var(--blue); }

.cut-corner {
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--paper);
  --btn-bd: rgba(174, 183, 194, 0.42);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-bd);
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}
.btn:hover { transform: translate(-1px, -1px); }
.btn--primary {
  --btn-bg: var(--orange);
  --btn-fg: #160F0B;
  --btn-bd: var(--orange);
  font-weight: 700;
}
.btn--primary:hover {
  --btn-bg: var(--cyan);
  --btn-bd: var(--cyan);
  --btn-fg: #06131A;
}
.btn--ghost {
  --btn-fg: var(--cyan);
  --btn-bd: rgba(22, 224, 255, 0.55);
}
.btn--ghost:hover {
  --btn-bg: rgba(22, 224, 255, 0.14);
  --btn-bd: var(--cyan);
}
.btn--paper {
  --btn-bg: var(--paper-ink);
  --btn-fg: var(--paper);
  --btn-bd: var(--paper-ink);
}
.btn--paper:hover {
  --btn-bg: var(--blue);
  --btn-bd: var(--blue);
  --btn-fg: #FFFFFF;
}
.btn--sm {
  padding: 9px 14px;
  font-size: 13px;
  letter-spacing: 0.08em;
}

/* ---------- 面包屑 ---------- */
.breadcrumb { margin: 0 0 clamp(16px, 2vw, 26px); }
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.breadcrumb-link:hover,
.breadcrumb-link:focus-visible { color: var(--paper); border-bottom-color: var(--cyan); }
.breadcrumb-sep { color: rgba(174, 183, 194, 0.5); }
.breadcrumb-item[aria-current="page"] { color: var(--paper); }

/* ---------- 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(120% 90% at 14% 8%, rgba(11, 94, 215, 0.55), transparent 62%),
    radial-gradient(100% 80% at 88% 92%, rgba(255, 90, 31, 0.32), transparent 64%),
    linear-gradient(150deg, #151A20, #0B0E12);
  border: 1px solid rgba(22, 224, 255, 0.22);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(112deg, rgba(22, 224, 255, 0.10) 0 1px, transparent 1px 14px);
  pointer-events: none;
}
.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
  line-height: 1.7;
}

/* ---------- 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: rgba(17, 20, 24, 0.96);
  border-bottom: 1px solid var(--line-blue);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 120;
  padding: 10px 18px;
  background: var(--cyan);
  color: #06131A;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 8px; }

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: var(--header-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  color: var(--paper);
  min-width: 0;
}
.brand-mark {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.6vw, 22px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}
.brand-tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.3;
  color: var(--mist);
  white-space: nowrap;
}
.brand:hover .brand-mark,
.brand:focus-visible .brand-mark { color: var(--cyan); }

.header-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: clamp(0px, 1vw, 14px);
  border-left: 1px solid var(--line);
}
.meta-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  line-height: 1.4;
}
.meta-value {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  line-height: 1.4;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
  min-width: 0;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
  min-width: 0;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px;
  color: var(--mist);
  font-size: 14px;
  letter-spacing: 0.04em;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--paper); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  height: 3px;
  background: var(--blue);
}

.nav-actions { display: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 3px;
  width: 52px;
  height: 46px;
  padding: 0 9px;
  background: var(--graphite-800);
  border: 1px solid rgba(22, 224, 255, 0.35);
  color: var(--cyan);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}
.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}
.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--mist);
  line-height: 1.2;
}
.site-header[data-open="true"] .nav-toggle-bar:first-child { transform: translateY(2.5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-2.5px) rotate(-45deg); }
.site-header[data-open="true"] .nav-toggle { border-color: var(--cyan); color: var(--cyan); }

.header-track {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: var(--track-h);
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--mist);
  border-top: 1px solid rgba(174, 183, 194, 0.12);
}
.track-index {
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}
.track-rule {
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(90deg, rgba(174, 183, 194, 0.45) 0 6px, transparent 6px 12px);
}
.track-label {
  color: rgba(174, 183, 194, 0.78);
  white-space: nowrap;
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan) 65%, var(--orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 80ms linear;
  z-index: 2;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--graphite-900);
  border-top: 1px solid var(--line-blue);
  color: var(--mist);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: repeating-linear-gradient(115deg, rgba(22, 224, 255, 0.85) 0 2px, transparent 2px 12px);
  opacity: 0.5;
  pointer-events: none;
}

.footer-frame {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 64px) var(--pad-x) clamp(24px, 3vw, 36px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: clamp(28px, 4vw, 56px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 36ch;
}
.footer-mark {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
}
.footer-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  line-height: 1.6;
}
.footer-summary {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.footer-coordinate {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--yellow);
  line-height: 1.6;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}
.footer-heading {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  line-height: 1.6;
  color: var(--cyan);
  text-transform: uppercase;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-link {
  align-self: flex-start;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible { color: var(--paper); border-bottom-color: var(--cyan); }
.footer-link[aria-current="page"] { color: var(--cyan); }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist);
}
.footer-contact li { overflow-wrap: anywhere; }
.footer-col--contact .footer-contact li:last-child { color: var(--yellow); }

.footer-base {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--pad-x) 30px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  font-size: 12px;
  letter-spacing: 0.04em;
}
.footer-copyright {
  font-family: var(--font-mono);
  color: var(--mist);
  letter-spacing: 0.06em;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}
.footer-legal .footer-link { font-size: 12px; }
.footer-icp {
  font-family: var(--font-mono);
  color: rgba(174, 183, 194, 0.8);
  letter-spacing: 0.08em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1340px) {
  .header-meta { display: none; }
}

@media (max-width: 1180px) {
  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 14px;
  }
  .header-actions { display: none; }
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: calc(var(--header-h) + var(--track-h));
    right: 0;
    width: min(88vw, 380px);
    max-height: calc(100vh - var(--header-h) - var(--track-h));
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 20px var(--pad-x) 30px;
    background: var(--graphite-800);
    border-left: 1px solid var(--line-blue);
    box-shadow: -28px 0 48px rgba(0, 0, 0, 0.5);
    transform: translateX(103%);
    visibility: hidden;
    transition: transform var(--dur) var(--ease), visibility var(--dur) step-end;
    z-index: 70;
  }
  .site-header[data-open="true"] .site-nav {
    transform: translateX(0);
    visibility: visible;
    transition: transform var(--dur) var(--ease), visibility 0s;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 2px;
    font-size: 17px;
    border-bottom: 1px solid var(--line);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--cyan); }
  .nav-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 4px;
  }
  .nav-actions .btn { width: 100%; }
}

@media (max-width: 1080px) {
  .footer-frame { grid-template-columns: minmax(0, 1fr); }
  .footer-brand { max-width: none; }
}

@media (max-width: 880px) {
  .grid--2,
  .grid--asym { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  :root {
    --header-h: 62px;
    --track-h: 20px;
  }
  body { font-size: 16px; }
  .brand-tagline { font-size: 9px; letter-spacing: 0.12em; }
  .header-track { font-size: 9px; letter-spacing: 0.14em; gap: 8px; }
  .track-label { display: none; }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .media-frame--wide { aspect-ratio: 16 / 9; }
  .media-frame--tall { aspect-ratio: 4 / 5; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
  .btn:hover { transform: none; }
  .scroll-progress { transition: none; }
}

@media print {
  body {
    padding-top: 0;
    background: #FFFFFF;
    color: #000000;
  }
  body::before,
  body::after { display: none; }
  .site-header {
    position: static;
    background: #FFFFFF;
    border-bottom: 1px solid #000000;
  }
  .skip-link,
  .nav-toggle,
  .scroll-progress,
  .header-track { display: none !important; }
  .site-nav { position: static; transform: none; visibility: visible; }
  .site-footer { border-top: 1px solid #000000; background: #FFFFFF; color: #000000; }
  .panel-paper,
  .section--paper { background: #FFFFFF; color: #000000; box-shadow: none; }
  .media-frame { border: 1px solid #000000; }
}