:root {
  --color-primary: #00A8FF;
  --color-accent: #FF6A00;
  --color-lime: #39FF14;
  --color-bg: #0B0F14;
  --color-surface: #1A2230;
  --color-text: #F5F7FA;
  --color-muted: #9AA7B5;
  --color-line: #252F3D;
  --gradient-primary: linear-gradient(135deg, #00A8FF, #0055FF);
  --font-heading: "DIN Alternate", "Arial Black", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --header-height: 68px;
  --header-height-hover: 76px;
  --container-max: 1280px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-top: var(--header-height-hover);
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  background: none;
  border: none;
  color: inherit;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: fixed;
  top: -48px;
  left: 16px;
  z-index: 2000;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  transition: top 0.2s;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(11, 15, 20, 0.84);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  transition: height 0.3s var(--ease), background-color 0.3s;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.02) 0 1px, transparent 1px 14px);
}

@media (hover: hover) {
  .site-header:hover {
    height: var(--header-height-hover);
  }
}

.header__inner {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: 2;
  transition: width 0.1s linear;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: 12px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 1px;
  color: #fff;
  box-shadow: 0 4px 18px rgba(0, 168, 255, 0.25);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 2px;
  color: var(--color-text);
  white-space: nowrap;
}

.header__notice {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 168, 255, 0.08);
  border: 1px solid rgba(0, 168, 255, 0.2);
  border-radius: 999px;
  padding: 4px 12px 4px 6px;
  overflow: hidden;
  max-width: 360px;
  min-width: 0;
}

.notice-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-lime);
  white-space: nowrap;
  background: var(--color-bg);
  border-radius: 999px;
  padding: 4px 10px;
  flex-shrink: 0;
}

.notice-tag__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-lime);
  animation: pulse-dot 1.6s infinite;
}

.notice-viewport {
  overflow: hidden;
  flex: 1;
  min-width: 0;
}

.notice-text {
  display: inline-block;
  white-space: nowrap;
  font-size: 12px;
  color: var(--color-muted);
  animation: ticker 14s linear infinite;
}

.header__nav {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  margin: 0;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color 0.2s;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--color-primary);
}

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

.nav-link[aria-current="page"]::after {
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.header__fav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-primary);
  background: rgba(0, 168, 255, 0.08);
  border: 1px solid rgba(0, 168, 255, 0.2);
  transition: transform 0.2s, background 0.2s, color 0.2s;
  flex-shrink: 0;
}

.header__fav:hover,
.header__fav:focus-visible {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.nav-toggle__line {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.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-footer {
  position: relative;
  background: var(--color-surface);
  color: var(--color-muted);
  border-top: 1px solid var(--color-line);
  margin-top: 80px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-lime));
}

.footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr;
  gap: 48px;
}

.brand-logo--footer .brand-mark {
  width: 44px;
  height: 44px;
  font-size: 17px;
}

.footer__tagline {
  margin-top: 12px;
  font-size: 13px;
  color: var(--color-muted);
  max-width: 240px;
}

.footer__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-lime);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-lime);
  animation: pulse-dot 1.6s infinite;
}

.footer__section-label {
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 1px;
  color: var(--color-text);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.footer__downloads {
  display: grid;
  align-content: start;
  gap: 12px;
}

.download-list {
  display: grid;
  gap: 8px;
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-text);
  transition: color 0.2s, transform 0.2s;
}

.download-link::before {
  content: "↘";
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.download-link:hover,
.download-link:focus-visible {
  color: var(--color-primary);
  transform: translateX(4px);
}

.footer__contact {
  display: grid;
  align-content: start;
  gap: 12px;
}

.footer__contact-list {
  display: grid;
  gap: 8px;
}

.footer__contact-item {
  font-size: 14px;
  line-height: 1.6;
}

.footer__meta {
  border-top: 1px solid var(--color-line);
}

.footer__meta-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  font-size: 12px;
}

.footer__icp,
.footer__year {
  font-family: var(--font-mono);
}

.footer__legal-links {
  display: flex;
  gap: 16px;
  margin-left: auto;
}

.footer__legal-links a {
  color: var(--color-muted);
  transition: color 0.2s;
}

.footer__legal-links a:hover,
.footer__legal-links a:focus-visible {
  color: var(--color-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 168, 255, 0.3);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 168, 255, 0.4);
}

.btn--ghost {
  border: 1px solid var(--color-line);
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.02);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  font-size: 13px;
  color: var(--color-muted);
}

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

.breadcrumb__sep {
  color: var(--color-line);
}

.grid {
  display: grid;
  gap: 24px;
}

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

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

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

.panel {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-line);
}

.media-box {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  aspect-ratio: 16 / 9;
}

.media-box > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-box--wide {
  aspect-ratio: 16 / 7;
}

.media-box--portrait {
  aspect-ratio: 3 / 4;
}

@keyframes ticker {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(-100%);
  }
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5);
  }
  50% {
    opacity: 0.7;
    box-shadow: 0 0 0 6px rgba(57, 255, 20, 0);
  }
}

@media (max-width: 1100px) {
  .header__notice {
    display: none;
  }
}

@media (max-width: 900px) {
  body {
    padding-top: var(--header-height);
  }

  .site-header:hover {
    height: var(--header-height);
  }

  .header__inner {
    padding: 0 16px;
    gap: 8px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
    font-size: 14px;
    border-radius: 10px;
  }

  .brand-name {
    font-size: 17px;
  }

  .header__fav {
    margin-left: auto;
    width: 36px;
    height: 36px;
  }

  .nav-toggle {
    display: flex;
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(11, 15, 20, 0.98);
    border-bottom: 1px solid var(--color-line);
    border-top: 1px solid rgba(0, 168, 255, 0.2);
    padding: 16px 24px;
    display: none;
    margin-left: 0;
  }

  .header__nav[data-open] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 12px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

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

  .nav-link[aria-current="page"] {
    background: rgba(0, 168, 255, 0.08);
    color: var(--color-primary);
    border-radius: var(--radius-sm);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 40px 16px 32px;
  }
}

@media (max-width: 600px) {
  .footer__inner {
    grid-template-columns: 1fr;
  }

  .footer__meta-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px 16px;
  }

  .footer__legal-links {
    margin-left: 0;
    flex-wrap: wrap;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}