:root {
  --bg-primary: #0A192F;
  --bg-card: #0F2540;
  --accent-primary: #00FF87;
  --accent-secondary: #FF4B4B;
  --accent-tertiary: #00D4FF;
  --text-primary: #E6F0FF;
  --text-secondary: #8899AA;
  --border-line: #1A2F4E;
  --success: #00C853;
  --warning: #FFB300;
  --font-body: 'Helvetica Neue', 'Segoe UI', Arial, sans-serif;
  --font-heading: 'Arial Black', 'Helvetica Neue', sans-serif;
  --fs-hero: 3.5rem;
  --fs-section: 2.5rem;
  --fs-card: 1.5rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;
  --container: 1200px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --header-h: 75px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.35s ease;
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button {
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

a {
  color: var(--accent-tertiary);
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--accent-primary);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.2;
  color: var(--text-primary);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

#main-content {
  scroll-margin-top: var(--header-h);
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-3);
  z-index: 2000;
  padding: 10px 18px;
  background: var(--bg-primary);
  border: 1px solid var(--accent-primary);
  color: var(--accent-primary);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--accent-tertiary);
  outline-offset: -2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 25, 47, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-line);
}

.site-header::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 12%;
  height: 1px;
  background: var(--accent-secondary);
  opacity: 0.6;
  z-index: 1;
}

.header-topline {
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary) 0%, var(--accent-tertiary) 35%, transparent 35%, transparent 65%, var(--accent-tertiary) 65%, var(--accent-secondary) 100%);
  opacity: 0.9;
}

.header-shell {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  position: relative;
  background: linear-gradient(115deg, transparent 55%, rgba(0, 212, 255, 0.04) 55.5%);
}

.header-brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.brand-svg {
  display: block;
  width: 100%;
  height: 100%;
}

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.15rem;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.brand-tagline {
  font-size: 0.58rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-primary);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-top: 3px;
}

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

.nav-list {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-item + .nav-item {
  border-left: 1px solid var(--border-line);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  transition: color 0.25s ease, background 0.25s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

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

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

.nav-link[aria-current="page"] {
  color: var(--accent-primary);
  background: rgba(0, 255, 135, 0.05);
}

.nav-index {
  font-size: 0.6rem;
  font-weight: 900;
  color: var(--accent-tertiary);
  letter-spacing: 0.06em;
}

.nav-label {
  font-weight: 500;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.25s ease;
}

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

.toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

@media (max-width: 900px) {
  :root {
    --header-h: 67px;
  }

  .header-shell {
    min-height: 64px;
    background: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

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

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

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

  .header-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-line);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: max-height 0.4s ease, opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  }

  .header-nav[data-open] {
    max-height: calc(100vh - var(--header-h));
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    overflow-y: auto;
    box-shadow: 0 24px 32px rgba(0, 0, 0, 0.3);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3);
  }

  .nav-item + .nav-item {
    border-left: none;
    border-top: 1px solid var(--border-line);
  }

  .nav-link {
    padding: 14px var(--space-3);
    font-size: 0.95rem;
  }

  .nav-link::after {
    left: var(--space-3);
    right: auto;
    width: 32px;
    bottom: 8px;
  }

  .nav-index {
    font-size: 0.7rem;
  }
}

@media (max-width: 1100px) and (min-width: 901px) {
  .nav-link {
    padding: 10px 10px;
    font-size: 0.8125rem;
  }

  .header-shell {
    padding: 0 var(--space-3);
  }
}

@media (max-width: 360px) {
  .brand-name {
    font-size: 1rem;
  }

  .brand-tagline {
    font-size: 0.5rem;
  }
}

.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-line);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 35%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary), transparent);
}

.site-footer::after {
  content: '';
  position: absolute;
  bottom: -30px;
  right: -40px;
  width: 200px;
  height: 200px;
  border: 1px solid rgba(0, 212, 255, 0.08);
  border-radius: 50%;
  pointer-events: none;
}

.footer-shell {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-7) var(--space-4) var(--space-4);
  position: relative;
  z-index: 1;
}

.footer-bento {
  display: grid;
  grid-template-columns: 2.2fr 1.2fr 1fr 1.4fr;
  gap: var(--space-6);
}

.footer-block {
  min-width: 0;
}

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

.footer-logo {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: 0.03em;
  line-height: 1.1;
}

.footer-tagline {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent-primary);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  margin-top: 4px;
}

.footer-trust {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-line);
  position: relative;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--accent-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: var(--text-primary);
  font-size: 0.875rem;
  line-height: 1.5;
  transition: color 0.25s ease, padding-left 0.25s ease;
}

.footer-links a:hover {
  color: var(--accent-primary);
  padding-left: 4px;
}

.footer-meta-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-meta-label {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.footer-meta-value {
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.footer-meta-value:hover {
  color: var(--accent-primary);
}

.footer-notice {
  margin-top: var(--space-6);
  padding: 12px 16px;
  background: rgba(0, 255, 135, 0.035);
  border: 1px solid var(--border-line);
  border-left: 3px solid var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.notice-ping {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
  flex-shrink: 0;
  animation: noticePulse 2s ease-in-out infinite;
}

.notice-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

@keyframes noticePulse {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 255, 135, 0.5);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(0, 255, 135, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 255, 135, 0);
  }
}

.footer-bot {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-line);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.footer-copyright {
  margin: 0;
}

.footer-sep {
  color: var(--border-line);
}

.footer-icp {
  color: var(--text-secondary);
}

@media (max-width: 1024px) {
  .footer-bento {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .footer-trust {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .footer-bento {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .footer-shell {
    padding-top: var(--space-6);
  }

  .footer-notice {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-bot {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .footer-sep {
    display: none;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  background: var(--accent-primary);
  color: var(--bg-primary);
  font-size: 0.875rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
  gap: 8px;
  transition: background 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
}

.btn:hover {
  background: rgba(0, 255, 135, 0.85);
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 255, 135, 0.2);
}

.btn-ghost {
  background: transparent;
  color: var(--accent-primary);
  border: 1px solid var(--accent-primary);
}

.btn-ghost:hover {
  background: rgba(0, 255, 135, 0.08);
  color: var(--accent-primary);
  box-shadow: none;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.75rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: var(--space-3) 0;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.breadcrumb a {
  color: var(--text-secondary);
  font-size: inherit;
}

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

.breadcrumb-sep {
  color: var(--border-line);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

.content-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.content-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

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

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.section-title {
  font-size: var(--fs-section);
  margin: 0;
}

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

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-cols-5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

@media (max-width: 1024px) {
  .grid-cols-4,
  .grid-cols-5 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-cols-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.card-accent {
  border-left: 3px solid var(--accent-primary);
}

.card-title {
  font-size: var(--fs-card);
  margin-bottom: var(--space-2);
}

.card-body {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
}

.media-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-primary) 100%);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  min-height: 140px;
}

.media-frame[data-ratio="16:9"]::before,
.media-frame[data-ratio="4:3"]::before,
.media-frame[data-ratio="1:1"]::before {
  content: '';
  display: block;
  width: 100%;
}

.media-frame[data-ratio="16:9"]::before {
  padding-bottom: 56.25%;
}

.media-frame[data-ratio="4:3"]::before {
  padding-bottom: 75%;
}

.media-frame[data-ratio="1:1"]::before {
  padding-bottom: 100%;
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(0, 212, 255, 0.06) 48%, transparent 66%);
  background-size: 250% 100%;
  animation: mediaSweep 4s ease-in-out infinite;
  pointer-events: none;
}

.media-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-align: center;
  padding: var(--space-3);
}

@keyframes mediaSweep {
  0% {
    background-position: 200% 0;
  }
  50% {
    background-position: -50% 0;
  }
  100% {
    background-position: -50% 0;
  }
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 10000;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary));
  box-shadow: 0 0 12px rgba(0, 255, 135, 0.4);
  pointer-events: none;
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 999;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--accent-primary);
  color: var(--accent-primary);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s, background 0.25s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-primary);
  color: var(--bg-primary);
}

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

.text-accent {
  color: var(--accent-primary);
}

.text-accent-secondary {
  color: var(--accent-secondary);
}

.mt-0 {
  margin-top: 0;
}

.mb-1 {
  margin-bottom: var(--space-1);
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-3 {
  margin-bottom: var(--space-3);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-5 {
  margin-bottom: var(--space-5);
}

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

@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;
  }

  .header-nav,
  .nav-toggle .toggle-line,
  .back-to-top,
  .media-frame::after,
  .notice-ping {
    transition: none !important;
    animation: none !important;
  }
}