:root {
  --color-primary-deep-blue: #0A1128;
  --color-secondary-navy: #1A2A44;
  --color-accent-neon: #39FF14;
  --color-accent-orange: #FF6B35;
  --color-light-cloud: #F8F9FA;
  --color-text-light: #FFFFFF;
  --color-text-secondary-light: #C0C5CE;
  --color-text-dark: #1B1F2A;
  --color-text-secondary-dark: #5A5F6A;
  --color-border-dark: #2D3A4F;
  --color-border-light: #E5E8EB;
  --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Cascadia Mono", Consolas, monospace;
  --header-height: 72px;
  --container-width: 1280px;
  --transition-speed: 200ms;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-dark);
  background: var(--color-light-cloud);
  -webkit-font-smoothing: antialiased;
  min-width: 320px;
  overflow-x: hidden;
}

main {
  display: block;
}

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

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

ul,
ol {
  list-style: none;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

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

::selection {
  background: var(--color-accent-neon);
  color: var(--color-primary-deep-blue);
}

.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;
}

/* ===== 布局基础 ===== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding: 96px 0;
}

.section-dark {
  background: var(--color-primary-deep-blue);
  color: var(--color-text-light);
}

.section-light {
  background: var(--color-light-cloud);
  color: var(--color-text-dark);
}

.section-header {
  margin-bottom: 48px;
  position: relative;
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-neon);
}

.section-index::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  background: var(--color-accent-orange);
}

.section-title {
  display: inline-block;
  margin-top: 14px;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  text-transform: uppercase;
  transform: skewX(-4deg);
  transform-origin: left center;
  max-width: 80%;
}

.section-sub {
  margin-top: 16px;
  max-width: 640px;
  font-size: 16px;
  color: var(--color-text-secondary-dark);
}

.section-dark .section-sub {
  color: var(--color-text-secondary-light);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.btn-primary {
  background: var(--color-accent-neon);
  color: var(--color-primary-deep-blue);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(57, 255, 20, 0.35);
}

.btn-ghost {
  background: rgba(57, 255, 20, 0.1);
  color: var(--color-accent-neon);
}

.btn-ghost:hover {
  background: var(--color-accent-neon);
  color: var(--color-primary-deep-blue);
  transform: translateY(-2px);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary-light);
}

.breadcrumb-link {
  transition: color var(--transition-speed) ease;
}

.breadcrumb-link:hover {
  color: var(--color-accent-neon);
}

.breadcrumb-sep {
  color: var(--color-accent-orange);
}

.breadcrumb-current {
  color: var(--color-text-light);
  font-weight: 700;
}

/* ===== 页头 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.site-header[data-scrolled="true"] {
  background: rgba(10, 17, 40, 0.88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom-color: rgba(45, 58, 79, 0.7);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.header-container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1100;
  background: var(--color-accent-neon);
  color: var(--color-primary-deep-blue);
  padding: 12px 24px;
  font-weight: 900;
  letter-spacing: 0.06em;
}

.skip-link:focus {
  left: 0;
}

.scroll-progress {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 1100;
  pointer-events: none;
  background: linear-gradient(90deg, var(--color-accent-neon), var(--color-accent-orange));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  width: 38px;
  height: 38px;
  background: rgba(57, 255, 20, 0.1);
  clip-path: polygon(0 0, 100% 0, 100% 55%, 55% 100%, 0 100%);
  transition: background var(--transition-speed) ease;
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent-neon) 0 34%, transparent 34%);
  opacity: 0.85;
}

.brand-mark-line {
  position: absolute;
  left: 5px;
  top: 50%;
  width: 16px;
  height: 2px;
  background: var(--color-accent-neon);
  transform: translateY(-50%) skewX(-32deg);
  z-index: 1;
}

.brand-mark-dot {
  position: absolute;
  right: 5px;
  bottom: 5px;
  width: 7px;
  height: 7px;
  background: var(--color-accent-orange);
  z-index: 1;
  transition: transform var(--transition-speed) ease;
}

.brand:hover .brand-mark {
  background: rgba(57, 255, 20, 0.22);
}

.brand:hover .brand-mark-dot {
  transform: translateX(2px) scale(1.4);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--color-text-light);
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--color-accent-neon);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid rgba(57, 255, 20, 0.5);
  transition: border-color var(--transition-speed) ease;
}

.nav-toggle:hover {
  border-color: var(--color-accent-neon);
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-accent-neon);
  transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease;
}

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

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

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

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  display: block;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text-light);
  transition: color var(--transition-speed) ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  background: var(--color-accent-neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-speed) ease;
}

.nav-link:hover {
  color: var(--color-accent-neon);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

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

/* ===== 页脚 ===== */
.site-footer {
  position: relative;
  background: var(--color-primary-deep-blue);
  color: var(--color-text-light);
  padding-top: 64px;
  border-top: 1px solid var(--color-border-dark);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 8px;
  background-image:
    linear-gradient(45deg, var(--color-light-cloud) 25%, transparent 25%),
    linear-gradient(-45deg, var(--color-light-cloud) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--color-light-cloud) 75%),
    linear-gradient(-45deg, transparent 75%, var(--color-light-cloud) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 -8px, -8px 0, 8px 8px;
}

.footer-top {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
  display: grid;
  grid-template-columns: 1.4fr 1.1fr 1.1fr 1.3fr;
  gap: 48px;
  padding-bottom: 56px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-logo {
  display: block;
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--color-text-light);
}

.footer-sub {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent-neon);
}

.footer-about-text {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-secondary-light);
}

.footer-trust {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-accent-neon);
}

.footer-heading {
  margin-bottom: 16px;
  padding-bottom: 8px;
  position: relative;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.footer-heading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-accent-neon);
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  display: inline-block;
  font-size: 14px;
  color: var(--color-text-secondary-light);
  transition: color var(--transition-speed) ease, padding-left var(--transition-speed) ease;
}

.footer-links a:hover {
  color: var(--color-accent-neon);
  padding-left: 6px;
}

.footer-contact {
  font-size: 14px;
  color: var(--color-text-secondary-light);
}

.footer-contact-item {
  margin-bottom: 10px;
  word-break: break-all;
}

.footer-bottom {
  border-top: 1px solid var(--color-border-dark);
}

.footer-bottom-flex {
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 20px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary-light);
}

.footer-icp {
  letter-spacing: 0.04em;
}

/* ===== 卡片与网格 ===== */
.grid {
  display: grid;
  gap: 32px;
}

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

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

.card {
  position: relative;
  padding: 32px;
  background: var(--color-secondary-navy);
  color: var(--color-text-light);
  border-left: 3px solid var(--color-accent-neon);
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
  border-color: var(--color-accent-orange);
}

.card-title {
  margin-bottom: 12px;
  font-size: 22px;
  font-weight: 900;
}

.card-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary-light);
}

/* ===== 状态标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(57, 255, 20, 0.12);
  color: var(--color-accent-neon);
}

.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.tag-live {
  background: rgba(255, 107, 53, 0.14);
  color: var(--color-accent-orange);
}

.tag-update {
  background: rgba(192, 197, 206, 0.14);
  color: var(--color-text-secondary-light);
}

.tag-update::before {
  background: var(--color-accent-orange);
}

/* ===== 数据面板 ===== */
.data-card {
  position: relative;
  padding: 24px;
  background: var(--color-primary-deep-blue);
  color: var(--color-text-light);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  border-left: 3px solid var(--color-accent-neon);
}

.data-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary-light);
}

.data-value {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-light);
}

.data-unit {
  margin-left: 4px;
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text-secondary-light);
}

/* ===== 页面首屏 ===== */
.page-hero {
  padding: calc(var(--header-height) + 88px) 0 88px;
  background: var(--color-primary-deep-blue);
  color: var(--color-text-light);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}

.page-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(44px, 8vw, 88px);
  font-weight: 900;
  line-height: 1.05;
  text-transform: uppercase;
  transform: skewX(-4deg);
  transform-origin: left center;
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary-light);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: calc(var(--header-height) + 1px);
    left: 0;
    width: 100%;
    display: none;
    background: var(--color-primary-deep-blue);
    border-bottom: 1px solid var(--color-border-dark);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 16px;
  }

  .nav-link {
    display: block;
    padding: 14px 24px;
    font-size: 16px;
  }

  .nav-link::after {
    display: none;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .section-header {
    margin-bottom: 32px;
  }

  .section-title {
    max-width: 100%;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

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

  .page-hero {
    padding: calc(var(--header-height) + 56px) 0 56px;
  }
}

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