:root {
  --color-bg: #0a192f;
  --color-bg-panel: #112240;
  --color-border: #1d2d50;
  --color-text: #e6f1ff;
  --color-text-dim: #8892b0;
  --color-accent: #ff6b35;
  --color-accent-soft: #ff8255;
  --color-accent-green: #00ff9f;
  --color-accent-yellow: #ffd166;
  --font-heading: 'Archivo Black', 'Arial Black', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --header-width: 280px;
  --header-height-mobile: 64px;
  --font-size-hero: clamp(2.5rem, 6vw, 4.5rem);
  --font-size-section: clamp(1.75rem, 3.5vw, 2.75rem);
  --font-size-card-title: 1.25rem;
  --font-size-data: clamp(1.75rem, 4vw, 3rem);
  --radius: 6px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(ellipse at 15% -5%, rgba(0, 255, 159, 0.05), transparent 55%),
    radial-gradient(ellipse at 95% 110%, rgba(255, 107, 53, 0.06), transparent 50%);
  min-height: 100vh;
  padding-top: var(--header-height-mobile);
  overflow-x: hidden;
}

@media (min-width: 769px) {
  body {
    padding-top: 0;
    padding-left: var(--header-width);
  }
}

#main-content {
  display: block;
  min-height: calc(100vh - var(--header-height-mobile));
}

@media (min-width: 769px) {
  #main-content {
    min-height: 100vh;
  }
}

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

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  line-height: 1.25;
  color: var(--color-text);
  font-weight: 700;
}

code,
pre,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

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

::selection {
  background: rgba(255, 107, 53, 0.35);
  color: var(--color-text);
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 300;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.35);
  transition: top 0.2s ease;
}

.skip-link:focus-visible {
  top: 12px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100%;
  height: var(--header-height-mobile);
  background: linear-gradient(180deg, var(--color-bg-panel) 0%, #0d1b33 100%);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 1rem;
}

@media (min-width: 769px) {
  .site-header {
    width: var(--header-width);
    height: 100vh;
    flex-direction: column;
    align-items: stretch;
    padding: 2rem 1.5rem 1.25rem;
    border-bottom: none;
    border-right: 1px solid var(--color-border);
  }

  .site-header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 48px;
    height: 48px;
    clip-path: polygon(0 0, 100% 0, 100% 100%);
    background: linear-gradient(135deg, var(--color-accent) 0%, transparent 100%);
    opacity: 0.35;
    pointer-events: none;
  }

  .site-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-green) 70%, transparent 100%);
    pointer-events: none;
  }
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #ff2d55 100%);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.02em;
  flex: none;
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
}

.brand-info {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--color-text);
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--color-text-dim);
  letter-spacing: 0.35em;
  margin-top: 2px;
}

@media (min-width: 769px) {
  .header-brand {
    margin-bottom: 2.5rem;
  }

  .brand-mark {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-sub {
    font-size: 0.72rem;
  }
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 9px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  flex: none;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.25s 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);
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }
}

.site-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
}

@media (max-width: 768px) {
  .site-nav {
    position: fixed;
    top: var(--header-height-mobile);
    left: 0;
    bottom: 0;
    width: min(320px, 84vw);
    padding: 1.5rem 1rem 2rem;
    background: linear-gradient(180deg, var(--color-bg-panel) 0%, #0d1b33 100%);
    border-right: 1px solid var(--color-border);
    border-top: 1px solid var(--color-border);
    transform: translateX(-105%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    z-index: 99;
    flex: none;
    box-shadow: 8px 0 30px rgba(0, 0, 0, 0.35);
  }

  .site-nav[data-open] {
    transform: translateX(0);
  }
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

@media (max-width: 768px) {
  .nav-list {
    flex: 1;
  }
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.7rem 0.9rem;
  text-decoration: none;
  color: var(--color-text-dim);
  border-left: 2px solid transparent;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

@media (max-width: 768px) {
  .nav-link {
    font-size: 1.02rem;
    padding: 0.85rem 1rem;
  }
}

.nav-link:hover {
  color: var(--color-text);
  background: rgba(255, 107, 53, 0.05);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.12), transparent);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-accent-green);
  letter-spacing: 0.05em;
  min-width: 2em;
}

.nav-label {
  flex: 1;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.25rem;
  background: var(--color-accent);
  color: var(--color-bg);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.header-cta:hover {
  transform: translateY(-2px);
  background: var(--color-accent-soft);
  box-shadow: 0 6px 24px rgba(255, 107, 53, 0.35);
  color: var(--color-bg);
}

.cta-arrow {
  font-size: 1.1em;
  line-height: 1;
  transition: transform var(--transition);
}

.header-cta:hover .cta-arrow {
  transform: translateX(4px);
}

@media (min-width: 769px) {
  .header-cta {
    margin-top: auto;
  }
}

@media (max-width: 768px) {
  .header-cta {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    width: 100%;
  }
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 0.25rem 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-text-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .header-status {
    padding-bottom: 0.5rem;
  }
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-green);
  box-shadow: 0 0 8px var(--color-accent-green);
  animation: status-pulse 2s ease-in-out infinite;
  flex: none;
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.site-footer {
  background: var(--color-bg-panel);
  border-top: 1px solid var(--color-border);
  padding: 3.5rem 1.5rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-green) 45%, transparent 85%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  max-width: 1280px;
  margin: 0 auto 3rem;
}

@media (min-width: 641px) and (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1025px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1.4fr;
    gap: 2rem;
  }
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-text);
  text-decoration: none;
  transition: opacity var(--transition);
}

.footer-brand-link:hover {
  opacity: 0.85;
}

.footer-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #ff2d55 100%);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.85rem;
  flex: none;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
}

.footer-tagline {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-text-dim);
  max-width: 34em;
}

.footer-download-btn {
  align-self: flex-start;
  font-size: 0.85rem;
  padding: 0.65rem 1.25rem;
}

.footer-heading {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-heading);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-list-item {
  font-size: 0.9rem;
  color: var(--color-text-dim);
  line-height: 1.6;
  word-break: break-word;
}

.footer-list-item a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
  padding-left: 0;
}

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

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  max-width: 1280px;
  margin: 0 auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

@media (min-width: 641px) {
  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-copyright {
  color: var(--color-text-dim);
}

.footer-icp {
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
}

.footer-trust {
  max-width: 1280px;
  margin: 1.5rem auto 0;
  padding: 0.9rem 1.1rem;
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--color-text-dim);
  background: rgba(255, 209, 102, 0.04);
  border-left: 3px solid var(--color-accent-yellow);
  border-top: 1px solid rgba(255, 209, 102, 0.12);
  border-right: 1px solid rgba(255, 209, 102, 0.12);
  border-bottom: 1px solid rgba(255, 209, 102, 0.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  letter-spacing: 0.02em;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.btn--primary:hover {
  background: var(--color-accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 107, 53, 0.35);
  color: var(--color-bg);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--ghost:hover {
  background: rgba(255, 107, 53, 0.08);
  color: var(--color-accent);
}

.btn--green {
  background: transparent;
  color: var(--color-accent-green);
  border-color: var(--color-accent-green);
}

.btn--green:hover {
  background: rgba(0, 255, 159, 0.08);
  color: var(--color-accent-green);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-text-dim);
  margin-bottom: 2.5rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  color: var(--color-border);
  font-size: 0.8rem;
}

.breadcrumb-link {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition);
}

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

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

.section-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 2rem;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent-green);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-section);
  line-height: 1.2;
  color: var(--color-text);
}

.panel {
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.panel--cut {
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.panel--accent {
  border-top: 2px solid var(--color-accent);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 2px;
  border: 1px solid;
}

.tag--live {
  background: rgba(0, 255, 159, 0.08);
  color: var(--color-accent-green);
  border-color: rgba(0, 255, 159, 0.3);
}

.tag--live::before {
  content: '●';
  font-size: 0.6em;
  animation: status-pulse 1.6s ease-in-out infinite;
}

.tag--hot {
  background: rgba(255, 107, 53, 0.08);
  color: var(--color-accent);
  border-color: rgba(255, 107, 53, 0.3);
}

.data-number {
  font-family: var(--font-mono);
  font-size: var(--font-size-data);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.data-number--accent {
  color: var(--color-accent);
}

.data-number--green {
  color: var(--color-accent-green);
}

.data-label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08) 0%, rgba(0, 255, 159, 0.04) 60%, transparent 100%);
  pointer-events: none;
}

.image-frame--landscape {
  aspect-ratio: 16 / 9;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.prose {
  max-width: 760px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-text-dim);
}

.prose h2 {
  font-size: 1.6rem;
  margin: 2.4rem 0 1rem;
  color: var(--color-text);
}

.prose h3 {
  font-size: 1.2rem;
  margin: 1.8rem 0 0.75rem;
  color: var(--color-text);
}

.prose p {
  margin-bottom: 1rem;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--color-accent-soft);
}

.prose ul,
.prose ol {
  margin: 0 0 1.25rem 1.4rem;
  list-style: initial;
}

.prose ul {
  list-style: square;
}

.prose li {
  margin-bottom: 0.4rem;
}

.tabs {
  margin: 2rem 0;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.5rem;
  padding-bottom: 0;
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 0.7rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-dim);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.tab-btn[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-panel[hidden] {
  display: none;
}

.tab-panel {
  padding: 1rem 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-green) 100%);
  z-index: 200;
  pointer-events: none;
  transition: width 0.08s linear;
}

.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  color: var(--color-bg);
  border: none;
  border-radius: var(--radius);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(255, 107, 53, 0.35);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.back-top:hover {
  transform: translateY(-3px);
  background: var(--color-accent-soft);
  box-shadow: 0 6px 26px rgba(255, 107, 53, 0.45);
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .status-dot,
  .tag--live::before {
    animation: none;
  }

  .scroll-progress {
    transition: none;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 0.78rem;
  }

  .brand-sub {
    display: none;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
    font-size: 0.85rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    padding: 2rem;
  }

  .footer-trust {
    margin-left: 0;
  }
}

@media (max-width: 768px) {
  .footer-bottom {
    font-size: 0.72rem;
  }

  .footer-trust {
    font-size: 0.72rem;
    margin-top: 1rem;
  }
}