*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sf-bg: #000000;
  --sf-bg-panel: #121212;
  --sf-bg-panel-2: #1A1A1A;
  --sf-bg-brand: #0A1E3C;
  --sf-bg-brand-dark: #061A33;
  --sf-line: #2A2A2A;
  --sf-text: #FFFFFF;
  --sf-text-dim: #D0D0D0;
  --sf-text-muted: #8A8A8A;
  --sf-brand-hi: #2E6EF3;
  --sf-accent: #7B2FF7;
  --sf-mint: #39FF88;
  --sf-font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --sf-font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --sf-font-data: "SF Mono", "Cascadia Code", "Roboto Mono", "Consolas", monospace;
  --sf-container: 1360px;
  --sf-gutter: clamp(1rem, 3vw, 2.5rem);
  --sf-header-h: 76px;
  --sf-shadow: 8px 8px 0 rgba(10, 30, 60, 0.55);
  --sf-shadow-hover: 8px 8px 0 rgba(46, 110, 243, 0.35);
  --sf-ease: 0.2s ease;
}

@media (max-width: 640px) {
  :root { --sf-header-h: 64px; }
}

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

body {
  background: var(--sf-bg);
  color: var(--sf-text-dim);
  font-family: var(--sf-font-body);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--sf-font-head);
  font-weight: 800;
  line-height: 1.2;
  color: var(--sf-text);
  margin-bottom: 0.5em;
}

p { margin-bottom: 1em; }

a {
  color: var(--sf-text-dim);
  text-decoration: none;
  transition: color var(--sf-ease);
}

a:hover { color: var(--sf-text); }

ul, ol { list-style: none; }

img, svg, video {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 300;
  padding: 0.7rem 1.2rem;
  background: var(--sf-brand-hi);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.85rem;
  transform: translateY(-180%);
  transition: transform 0.25s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.86);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--sf-line);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 120;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--sf-brand-hi), var(--sf-accent));
  box-shadow: 0 0 12px rgba(46, 110, 243, 0.55);
}

.header-hud {
  position: relative;
  max-width: var(--sf-container);
  margin: 0 auto;
  height: var(--sf-header-h);
  padding: 0 var(--sf-gutter);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.brand-cell {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  color: var(--sf-text);
}

.brand-cell:hover { color: var(--sf-text); }

.brand-badge {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--sf-brand-hi);
  background: var(--sf-bg-brand);
  font-family: var(--sf-font-data);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--sf-text);
  position: relative;
}

.brand-badge::after {
  content: "";
  position: absolute;
  inset: 3px;
  border: 1px dashed rgba(255, 255, 255, 0.45);
  pointer-events: none;
}

.brand-identity {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  white-space: nowrap;
}

.brand-name {
  font-family: var(--sf-font-head);
  font-weight: 900;
  font-size: 1.18rem;
  letter-spacing: 0.05em;
  color: var(--sf-text);
}

.brand-motto {
  display: block;
  margin-top: 0.12rem;
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--sf-text-muted);
  text-transform: uppercase;
}

.nav-trajectory {
  position: relative;
  flex: 1;
  height: 2px;
  min-width: 28px;
  background: repeating-linear-gradient(
    90deg,
    var(--sf-line) 0 10px,
    transparent 10px 20px
  );
  opacity: 0.9;
}

.traj-dot {
  position: absolute;
  right: -1px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sf-brand-hi);
  transform: translateY(-50%);
  box-shadow: 0 0 10px rgba(46, 110, 243, 0.85);
}

.nav-dock {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-track {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav-node {
  list-style: none;
}

.nav-link {
  display: block;
  padding: 0.55rem 0.7rem;
  font-family: var(--sf-font-head);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--sf-text-dim);
  border: 1px solid transparent;
  transition: color var(--sf-ease), background-color var(--sf-ease), border-color var(--sf-ease), box-shadow var(--sf-ease);
}

.nav-link:hover {
  color: var(--sf-text);
  background: var(--sf-bg-brand);
  border-color: var(--sf-line);
}

.nav-link[aria-current="page"] {
  color: var(--sf-text);
  background: var(--sf-bg-brand);
  border-color: var(--sf-brand-hi);
  box-shadow: inset 0 -3px 0 var(--sf-brand-hi);
}

.nav-toggle { display: none; }

.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--sf-bg-panel) 0%, #0A0A0A 100%);
  border-top: 3px solid var(--sf-brand-hi);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}

.footer-shell {
  position: relative;
  z-index: 1;
  max-width: var(--sf-container);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) var(--sf-gutter) 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem 1.5rem;
}

.footer-brand,
.footer-links,
.footer-contact {
  display: flex;
  flex-direction: column;
}

.footer-brand-link {
  display: inline-block;
  align-self: flex-start;
  color: var(--sf-text);
  transition: opacity var(--sf-ease);
}

.footer-brand-link:hover {
  color: var(--sf-text);
  opacity: 0.82;
}

.footer-brand-mark {
  display: inline-block;
  padding: 0.35rem 0.8rem;
  border: 2px solid var(--sf-text);
  box-shadow: 5px 5px 0 var(--sf-brand-hi);
  font-family: var(--sf-font-head);
  font-weight: 900;
  font-size: 1.55rem;
  letter-spacing: 0.08em;
  color: var(--sf-text);
  background: var(--sf-bg-panel);
}

.footer-slogan {
  margin-top: 1rem;
  color: var(--sf-text);
  font-family: var(--sf-font-head);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.footer-trust {
  margin-top: 0.7rem;
  max-width: 44ch;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--sf-text-muted);
}

.footer-head {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-bottom: 0.55rem;
  margin-bottom: 0.8rem;
  border-bottom: 1px solid var(--sf-line);
  font-family: var(--sf-font-data);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sf-text);
  font-weight: 700;
}

.footer-head::after {
  content: "";
  display: block;
  width: 16px;
  height: 2px;
  background: var(--sf-brand-hi);
  flex-shrink: 0;
}

.footer-list li + li {
  margin-top: 0.45rem;
}

.footer-list a {
  display: inline-block;
  color: var(--sf-text-dim);
  font-size: 0.9rem;
  transition: color var(--sf-ease), padding-left var(--sf-ease);
}

.footer-list a:hover {
  color: var(--sf-brand-hi);
  padding-left: 3px;
}

.footer-contact-list li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.footer-contact-list li + li {
  margin-top: 0.6rem;
}

.footer-label {
  display: block;
  font-family: var(--sf-font-data);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--sf-text-muted);
  text-transform: uppercase;
}

.footer-value {
  color: var(--sf-text-dim);
  font-size: 0.86rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--sf-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem 1.5rem;
  font-family: var(--sf-font-data);
  font-size: 0.74rem;
  color: var(--sf-text-muted);
}

.footer-copy {
  margin-right: auto;
  margin-bottom: 0;
  color: var(--sf-text-muted);
}

.footer-icp {
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--sf-line);
  color: var(--sf-text-dim);
}

.footer-policy {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.footer-policy a {
  color: var(--sf-text-dim);
}

.footer-policy a:hover {
  color: var(--sf-brand-hi);
}

.footer-policy-sep {
  color: var(--sf-line);
  margin: 0 0.25rem;
}

.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: var(--sf-bg-brand);
  border: 2px solid var(--sf-brand-hi);
  color: var(--sf-text);
  font-size: 1.2rem;
  font-weight: 800;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--sf-ease), transform var(--sf-ease), visibility var(--sf-ease), box-shadow var(--sf-ease);
}

.back-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--sf-brand-hi);
  box-shadow: 0 0 18px rgba(46, 110, 243, 0.5);
}

@media (max-width: 640px) {
  .back-top {
    right: 1rem;
    bottom: 1rem;
    width: 42px;
    height: 42px;
  }
}

.page-shell {
  max-width: var(--sf-container);
  margin: 0 auto;
  padding: 0 var(--sf-gutter);
}

.section-block {
  padding: clamp(2rem, 6vw, 4.5rem) 0;
}

.grid-basic {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 1.2rem;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
  font-family: var(--sf-font-data);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sf-brand-hi);
}

.kicker::before {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  background: var(--sf-brand-hi);
}

.section-title {
  font-family: var(--sf-font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--sf-text);
  margin-bottom: 0.75rem;
}

.section-desc {
  max-width: 56ch;
  color: var(--sf-text-muted);
  font-size: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.8rem 1.6rem;
  background: var(--sf-bg-brand);
  border: 2px solid var(--sf-brand-hi);
  color: var(--sf-text);
  font-family: var(--sf-font-head);
  font-weight: 800;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  transition: background-color var(--sf-ease), border-color var(--sf-ease), box-shadow var(--sf-ease);
}

.btn:hover {
  background: var(--sf-brand-hi);
  border-color: var(--sf-brand-hi);
  box-shadow: 4px 4px 0 rgba(255, 255, 255, 0.18);
  color: var(--sf-text);
}

.btn--ghost {
  background: transparent;
  border-color: var(--sf-line);
  color: var(--sf-text-dim);
}

.btn--ghost:hover {
  background: var(--sf-bg-panel);
  border-color: var(--sf-text-dim);
  color: var(--sf-text);
  box-shadow: none;
}

.panel-card {
  background: var(--sf-bg-panel);
  border: 1px solid var(--sf-line);
  box-shadow: var(--sf-shadow);
  padding: clamp(1.25rem, 2.4vw, 2rem);
  transition: border-color var(--sf-ease), box-shadow var(--sf-ease), background-color var(--sf-ease);
}

.panel-card:hover {
  border-color: var(--sf-brand-hi);
  box-shadow: var(--sf-shadow-hover);
}

.panel-card--accent {
  border-top: 4px solid var(--sf-brand-hi);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--sf-bg-panel);
  border: 1px solid var(--sf-line);
}

.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--sq { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }

.media-frame--placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 30%, rgba(46, 110, 243, 0.08) 40%, transparent 60%),
    repeating-linear-gradient(45deg, transparent 0 12px, rgba(255, 255, 255, 0.035) 12px 13px),
    var(--sf-bg-panel);
  pointer-events: none;
}

.data-num {
  font-family: var(--sf-font-data);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--sf-brand-hi);
}

.data-num sup {
  font-size: 0.5em;
  color: var(--sf-text-dim);
}

.tag-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--sf-line);
  background: var(--sf-bg-brand);
  font-family: var(--sf-font-data);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sf-text-dim);
}

.tag-label::before {
  content: "";
  display: block;
  width: 5px;
  height: 5px;
  background: var(--sf-brand-hi);
  flex-shrink: 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 1rem 0;
  font-size: 0.82rem;
  color: var(--sf-text-muted);
}

.breadcrumb a {
  color: var(--sf-text-dim);
}

.breadcrumb a:hover {
  color: var(--sf-brand-hi);
}

.bcrumb-sep {
  margin: 0 0.4rem;
  color: var(--sf-line);
}

.data-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.8rem;
  padding: 0.8rem 0;
}

.data-strip-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.data-strip-label {
  font-family: var(--sf-font-data);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sf-text-muted);
}

[data-js="enabled"] [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

[data-js="enabled"] [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-js="enabled"] [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (min-width: 641px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-brand {
    grid-column: span 2;
  }
  .footer-contact {
    grid-column: span 2;
  }
}

@media (min-width: 861px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  }
  .footer-brand,
  .footer-links,
  .footer-contact {
    grid-column: auto;
  }
}

@media (max-width: 860px) {
  .header-hud {
    gap: 0.75rem;
  }

  .nav-trajectory {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    margin-left: auto;
    padding: 10px;
    background: var(--sf-bg-panel);
    border: 1px solid var(--sf-line);
    transition: border-color var(--sf-ease);
  }

  .nav-toggle:hover {
    border-color: var(--sf-brand-hi);
  }

  .nav-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--sf-text);
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-dock {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    max-height: 0;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.98);
    border-bottom: 1px solid transparent;
    transition: max-height 0.3s ease, border-color 0.3s ease;
  }

  .nav-dock[data-open] {
    max-height: calc(100vh - var(--sf-header-h));
    overflow-y: auto;
    border-bottom-color: var(--sf-line);
  }

  .nav-track {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem 0 0.8rem;
  }

  .nav-node {
    border-bottom: 1px solid var(--sf-line);
  }

  .nav-node:last-child {
    border-bottom: none;
  }

  .nav-link,
  .nav-link[aria-current="page"] {
    width: 100%;
    padding: 0.9rem var(--sf-gutter);
    border: none;
    background: transparent;
    box-shadow: none;
    font-size: 0.95rem;
  }

  .nav-link:hover {
    background: var(--sf-bg-panel);
    border: none;
  }

  .nav-link[aria-current="page"] {
    background: var(--sf-bg-brand);
    box-shadow: inset 3px 0 0 var(--sf-brand-hi);
  }
}