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

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

body {
  margin: 0;
  background: var(--bg-deep);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

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

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

:focus-visible {
  outline: 3px solid var(--accent-blue);
  outline-offset: 3px;
}

::selection {
  background: var(--accent);
  color: #ffffff;
}

:root {
  --bg-deep: #0A0E17;
  --bg-panel: #121A27;
  --accent: #FF6B00;
  --accent-light: #FF9A45;
  --accent-deep: #FF3D00;
  --accent-blue: #00E5FF;
  --text-body: #C8D0DC;
  --text-muted: #7A889C;
  --text-heading: #FFFFFF;
  --border-color: #2A3547;
  --shadow: rgba(0, 0, 0, 0.5);
  --gradient-primary: linear-gradient(135deg, #FF6B00, #FF3D00);
  --font-heading: 'Archivo Black', 'Impact', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --content-max: 1160px;
  --rail-width: 280px;
  --header-h-mobile: 64px;
  --transition-fast: 200ms ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1.1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
}

h4 {
  font-size: 1.1rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -56px;
  left: var(--space-3);
  z-index: 300;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-4);
  box-shadow: 0 4px 16px var(--shadow);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-2);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 240;
  pointer-events: none;
  background: transparent;
}

.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--gradient-primary);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--rail-width);
  height: 100vh;
  background: var(--bg-deep);
  border-right: 2px solid var(--border-color);
  z-index: 200;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.header-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  padding: var(--space-5) 0 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-4) var(--space-5);
  border-bottom: 2px solid var(--border-color);
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  display: block;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.brand-mark::before {
  content: '';
  position: absolute;
  inset: 7px;
  border: 2px solid var(--accent-blue);
  border-radius: 50%;
}

.brand-mark::after {
  content: '';
  position: absolute;
  right: -6px;
  top: 5px;
  width: 14px;
  height: 14px;
  background: var(--gradient-primary);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  transform: rotate(15deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-text strong {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.brand-text small {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.nav-toggle {
  display: none;
}

.site-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.site-nav::-webkit-scrollbar {
  width: 4px;
}

.site-nav::-webkit-scrollbar-thumb {
  background: var(--border-color);
}

.nav-list {
  display: flex;
  flex-direction: column;
}

.nav-item {
  border-bottom: 1px solid rgba(42, 53, 71, 0.5);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--text-body);
  border-left: 3px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  background: rgba(255, 107, 0, 0.07);
  color: var(--text-heading);
}

.nav-link[aria-current="page"] {
  border-left-color: var(--accent);
  background: linear-gradient(90deg, rgba(255, 107, 0, 0.14), transparent 82%);
  color: var(--text-heading);
  font-weight: 700;
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--accent);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  width: 2em;
  flex-shrink: 0;
}

.nav-label {
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.nav-cta {
  display: block;
  text-align: center;
  margin: auto var(--space-4) 0;
  padding: var(--space-3) var(--space-4);
  background: var(--gradient-primary);
  color: #ffffff;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  box-shadow: 0 6px 20px rgba(255, 107, 0, 0.3);
  transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  box-shadow: 0 8px 28px rgba(255, 107, 0, 0.38);
}

.nav-cta:active {
  transform: translateY(1px);
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto;
  padding: var(--space-4) var(--space-4) var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  border-top: 1px solid rgba(42, 53, 71, 0.5);
  flex-shrink: 0;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(255, 107, 0, 0.8);
}

@media (min-width: 900px) {
  body {
    padding-left: var(--rail-width);
  }
}

@media (max-width: 899px) {
  .site-header {
    position: sticky;
    top: 0;
    width: 100%;
    height: var(--header-h-mobile);
    border-right: none;
    border-bottom: 2px solid var(--border-color);
    overflow: visible;
  }

  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--space-4);
    position: relative;
  }

  .brand {
    border-bottom: none;
    margin-bottom: 0;
    padding: 0;
  }

  .brand-text strong {
    font-size: 0.95rem;
  }

  .brand-text small {
    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;
    z-index: 51;
  }

  .nav-toggle-line {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-heading);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .nav-toggle[data-open] .nav-toggle-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[data-open] .nav-toggle-line:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[data-open] .nav-toggle-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex: none;
    max-height: calc(100vh - var(--header-h-mobile));
    background: var(--bg-deep);
    border-bottom: 2px solid var(--border-color);
    padding: var(--space-3) 0 var(--space-4);
    box-shadow: 0 16px 32px var(--shadow);
    z-index: 50;
  }

  .site-nav[data-open] {
    display: flex;
    flex-direction: column;
  }

  .nav-cta {
    margin: var(--space-4) var(--space-4) 0;
  }

  .header-status {
    display: none;
  }
}

.site-footer {
  background: var(--bg-deep);
  border-top: 2px solid var(--border-color);
  margin-top: var(--space-7);
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1.2fr;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  border-bottom: 2px solid var(--border-color);
}

.footer-brand {
  display: flex;
  gap: var(--space-4);
}

.footer-brand .brand-mark {
  margin-top: var(--space-1);
}

.footer-brand-text strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text-heading);
  margin-bottom: var(--space-2);
}

.footer-brand-text p {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 36em;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border-color);
}

.footer-links ul,
.footer-info ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-body);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-contact li {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.7;
}

.footer-contact a {
  color: var(--accent-blue);
}

.footer-contact a:hover {
  text-decoration: underline;
}

.support-note {
  margin-top: var(--space-4);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-panel);
  border-left: 3px solid var(--accent-blue);
  padding: var(--space-3);
}

.footer-legal {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: var(--space-4) 0;
}

.footer-legal-links {
  display: flex;
  gap: var(--space-5);
}

.footer-legal-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-legal-links a:hover {
  color: var(--accent);
}

.copyright {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (max-width: 899px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .footer-brand {
    flex-direction: column;
  }

  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-legal-links {
    flex-wrap: wrap;
    gap: var(--space-4);
  }
}

.section {
  padding: var(--space-6) 0;
}

.section-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.section-band {
  border-top: 2px solid var(--border-color);
  padding-top: var(--space-6);
  margin-top: var(--space-6);
  position: relative;
}

.section-no {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  border: 2px solid var(--accent);
  padding: 3px 10px;
  letter-spacing: 0.05em;
}

.section-lead {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.mono-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mono-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.lead-text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-body);
}

.text-muted {
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 32px;
  background: var(--bg-panel);
  border: 2px solid var(--border-color);
  color: var(--text-heading);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 5px 5px 0 var(--shadow);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.btn:hover {
  border-color: var(--accent);
  box-shadow: 7px 7px 0 var(--shadow);
  transform: translate(-1px, -1px);
}

.btn:active {
  box-shadow: 3px 3px 0 var(--shadow);
  transform: translate(2px, 2px);
}

.btn-primary {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 5px 5px 0 rgba(255, 107, 0, 0.25);
}

.btn-primary:hover {
  border-color: transparent;
  box-shadow: 7px 7px 0 rgba(255, 107, 0, 0.32);
}

.btn-ghost {
  background: transparent;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.05rem;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-blue);
  border: 1px solid rgba(0, 229, 255, 0.4);
  padding: 3px 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(0, 229, 255, 0.06);
}

.tilted-card {
  background: var(--bg-panel);
  border: 2px solid var(--border-color);
  box-shadow: 8px 8px 0 var(--shadow);
  padding: var(--space-5);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tilted-card[data-tilt="left"] {
  transform: rotate(-1.5deg);
}

.tilted-card[data-tilt="right"] {
  transform: rotate(1.5deg);
}

.tilted-card:hover {
  border-color: var(--accent);
  box-shadow: 10px 10px 0 var(--shadow);
}

.stat-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--accent);
}

.stat-unit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.image-frame {
  position: relative;
  background: var(--bg-panel);
  border: 2px solid var(--border-color);
  box-shadow: 6px 6px 0 var(--shadow);
  overflow: hidden;
}

.image-frame::before {
  content: '';
  display: block;
  padding-bottom: 56.25%;
}

.image-frame[data-ratio="wide"]::before {
  padding-bottom: 45%;
}

.image-frame[data-ratio="square"]::before {
  padding-bottom: 100%;
}

.image-frame[data-ratio="portrait"]::before {
  padding-bottom: 125%;
}

.image-frame .frame-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 10px,
      rgba(255, 255, 255, 0.015) 10px,
      rgba(255, 255, 255, 0.015) 20px
    ),
    var(--bg-panel);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid > * {
  min-width: 0;
}

@media (max-width: 899px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--accent-blue);
}

.breadcrumb [aria-current="page"] {
  color: var(--text-body);
}

.divider {
  border: none;
  border-top: 2px solid var(--border-color);
  margin: 0;
}

.bg-grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}

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