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

:root {
  --c-bg: #0A0F1E;
  --c-panel: #131C2E;
  --c-green: #00FF87;
  --c-blue: #00B7FF;
  --c-orange: #FF6B00;
  --c-text: #F5F7FA;
  --c-muted: #A0A8B8;
  --c-border: #2A3A5A;
  --c-green-soft: rgba(0,255,135,0.2);
  --c-blue-soft: rgba(0,183,255,0.1);
  --font-head: "Impact", "Archivo Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Roboto", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-mono: "Roboto Mono", "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --container: 1200px;
  --shadow: 0 14px 34px rgba(0,0,0,0.45);
}

html {
  scroll-behavior: smooth;
  background: var(--c-bg);
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% -10%, rgba(0,255,135,0.08), transparent 40%),
    radial-gradient(circle at 92% -4%, rgba(0,183,255,0.06), transparent 35%),
    var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

ul, ol {
  list-style: none;
}

a {
  color: var(--c-blue);
  text-decoration: none;
}

a:hover {
  color: var(--c-green);
}

button {
  font: inherit;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--c-green);
  outline-offset: 2px;
}

#main-content {
  min-height: 60vh;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin-inline: auto;
}

.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
  border-bottom: 2px solid var(--c-border);
}

.section:last-child {
  border-bottom: 0;
}

.page-title {
  font-family: var(--font-head);
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.page-subtitle {
  color: var(--c-muted);
  font-size: 1.1rem;
  max-width: 60ch;
  margin-bottom: 2rem;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title::before {
  content: "";
  flex: none;
  width: 0.9em;
  height: 0.9em;
  background: var(--c-green);
  box-shadow: 0 0 18px var(--c-green-soft);
}

.content-head {
  max-width: 75ch;
  margin-bottom: 2.5rem;
}

.content-body {
  max-width: 68ch;
}

.content-body p {
  margin-bottom: 1.5rem;
  color: #C8CFDB;
}

.content-body h2,
.content-body h3 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-head);
  line-height: 1.15;
  letter-spacing: 0.04em;
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.8rem 1.5rem;
  border: 2px solid var(--c-green);
  background: transparent;
  color: var(--c-green);
  font-family: var(--font-head);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  line-height: 1.2;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.btn:hover,
.btn:focus-visible {
  background: var(--c-green);
  color: var(--c-bg);
}

.btn--primary {
  background: var(--c-green);
  color: var(--c-bg);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: transparent;
  color: var(--c-green);
}

.btn--ghost {
  border-color: var(--c-blue);
  color: var(--c-blue);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--c-blue);
  color: var(--c-bg);
}

.panel {
  background: var(--c-panel);
  border: 2px solid var(--c-border);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 2vw, 2rem);
}

.panel--green {
  border-color: var(--c-green);
}

.panel--blue {
  border-color: var(--c-blue);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  margin-bottom: 2rem;
  font-size: 0.85rem;
  color: var(--c-muted);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.breadcrumbs li + li::before {
  content: "→";
  color: var(--c-border);
}

.breadcrumbs a {
  color: var(--c-blue);
}

.breadcrumbs-current {
  color: var(--c-green);
}

.grid {
  display: grid;
  gap: 1.25rem;
}

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

@media (min-width: 680px) {
  .grid--2,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 1000px) {
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background:
    linear-gradient(145deg, var(--c-blue-soft), transparent 40%),
    var(--c-panel);
  border: 2px solid var(--c-border);
  box-shadow: var(--shadow);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(42,58,90,0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,58,90,0.22) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

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

.media-frame--tall {
  aspect-ratio: 4 / 5;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--c-bg);
  border-bottom: 2px solid var(--c-border);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 5;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--c-green), var(--c-blue));
  pointer-events: none;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.6rem 1.2rem;
  background: var(--c-green);
  color: var(--c-bg);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.header-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0.75rem;
  background: var(--c-panel);
  border-bottom: 1px solid var(--c-border);
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.header-topline-note::before {
  content: "●";
  color: var(--c-green);
  margin-right: 0.4rem;
  font-size: 1rem;
  line-height: 1;
  vertical-align: -2px;
}

.header-topline-region {
  color: var(--c-blue);
}

.header-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding-block: clamp(1.25rem, 3vw, 2rem);
}

.header-masthead {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
}

.header-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  line-height: 1.1;
  text-decoration: none;
}

.header-brand-cn {
  font-family: var(--font-head);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  color: var(--c-text);
  letter-spacing: 0.16em;
  transition: color 0.2s;
}

.header-brand-sub {
  font-size: 0.8rem;
  color: var(--c-muted);
  letter-spacing: 0.55em;
  text-transform: uppercase;
}

.header-brand:hover .header-brand-cn {
  color: var(--c-green);
}

.header-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 20px;
  margin-top: 0.2rem;
}

.header-bars i {
  display: block;
  width: 3px;
  border-radius: 1px;
  background: var(--c-green);
  transform-origin: bottom;
  animation: barPulse 0.9s ease-in-out infinite alternate;
}

.header-bars i:nth-child(even) {
  background: var(--c-blue);
}

.header-bars i:nth-child(1) { height: 7px; }
.header-bars i:nth-child(2) { height: 14px; animation-delay: 0.08s; }
.header-bars i:nth-child(3) { height: 9px; animation-delay: 0.16s; }
.header-bars i:nth-child(4) { height: 17px; animation-delay: 0.24s; }
.header-bars i:nth-child(5) { height: 11px; animation-delay: 0.32s; }
.header-bars i:nth-child(6) { height: 15px; animation-delay: 0.4s; }
.header-bars i:nth-child(7) { height: 8px; animation-delay: 0.48s; }
.header-bars i:nth-child(8) { height: 13px; animation-delay: 0.56s; }

@keyframes barPulse {
  from {
    transform: scaleY(0.5);
    opacity: 0.65;
  }

  to {
    transform: scaleY(1);
    opacity: 1;
  }
}

.primary-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem;
}

.primary-nav a {
  position: relative;
  display: block;
  padding: 0.55rem 0.85rem;
  font-family: var(--font-head);
  font-size: 0.88rem;
  letter-spacing: 0.12em;
  color: var(--c-text);
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s;
}

.primary-nav a::before {
  content: "";
  position: absolute;
  left: 0.85rem;
  bottom: 0.28rem;
  width: 0;
  height: 3px;
  background: var(--c-green);
  transition: width 0.2s;
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--c-green);
}

.primary-nav a:hover::before,
.primary-nav a[aria-current="page"]::before {
  width: calc(100% - 1.7rem);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.75rem;
  border: 2px solid var(--c-border);
  background: transparent;
  color: var(--c-text);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.nav-toggle:hover {
  border-color: var(--c-green);
  color: var(--c-green);
}

.nav-toggle-text {
  font-family: var(--font-head);
}

.nav-toggle-burger {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.nav-toggle-burger::before,
.nav-toggle-burger::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.25s, top 0.25s;
}

.nav-toggle-burger::before {
  top: -6px;
}

.nav-toggle-burger::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-burger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-burger::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-footer {
  position: relative;
  background: var(--c-panel);
  border-top: 2px solid var(--c-border);
}

.footer-inner {
  padding-top: clamp(2.5rem, 5vw, 4rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.25fr 1fr 1fr;
    gap: 2.5rem;
  }
}

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

.footer-brand-cn {
  font-family: var(--font-head);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.14em;
  color: var(--c-text);
}

.footer-slogan {
  margin-top: 0.5rem;
  color: var(--c-green);
  font-size: 0.8rem;
  letter-spacing: 0.45em;
  text-transform: uppercase;
}

.footer-note {
  margin-top: 1.25rem;
  color: var(--c-muted);
  font-size: 0.88rem;
  line-height: 1.75;
  max-width: 34ch;
}

.footer-title {
  width: 100%;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--c-border);
  font-family: var(--font-head);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--c-green);
  text-transform: uppercase;
}

.footer-text {
  margin-bottom: 0.45rem;
  color: var(--c-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer-nav-link {
  position: relative;
  padding: 0.2rem 0;
  margin-bottom: 0.4rem;
  color: var(--c-text);
  font-size: 0.9rem;
  text-decoration: none;
}

.footer-nav-link:hover {
  color: var(--c-green);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.5rem;
  padding-block: 1.25rem;
  border-top: 2px solid var(--c-border);
  font-size: 0.8rem;
  color: var(--c-muted);
}

.footer-icp {
  font-family: var(--font-mono);
}

.feedback-float {
  position: fixed;
  right: 0.5rem;
  bottom: 28%;
  z-index: 35;
  writing-mode: vertical-rl;
  padding: 0.8rem 0.5rem;
  background: var(--c-orange);
  color: var(--c-bg);
  border: 2px solid transparent;
  font-family: var(--font-head);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-decoration: none;
  text-shadow: none;
  box-shadow: var(--shadow);
  transition: background 0.2s, color 0.2s;
}

.feedback-float:hover {
  background: var(--c-green);
  color: var(--c-bg);
}

.back-to-top {
  position: fixed;
  right: 0.75rem;
  bottom: 0.75rem;
  z-index: 35;
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  background: var(--c-panel);
  border: 2px solid var(--c-green);
  color: var(--c-green);
  font-size: 1.1rem;
  box-shadow: var(--shadow);
  transition: background 0.2s, color 0.2s;
}

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

@media (max-width: 920px) {
  .site-header {
    top: 0;
  }

  .header-main {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    padding-block: 0.75rem;
  }

  .header-masthead {
    flex: 1;
    min-width: 0;
    align-items: flex-start;
  }

  .header-brand {
    align-items: flex-start;
  }

  .header-brand-cn {
    font-size: 1.65rem;
    letter-spacing: 0.1em;
  }

  .header-brand-sub {
    font-size: 0.68rem;
    letter-spacing: 0.3em;
  }

  .header-bars {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    flex: none;
  }

  .primary-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    z-index: 50;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 0.75rem;
    background: var(--c-panel);
    border-top: 2px solid var(--c-green);
    border-bottom: 2px solid var(--c-border);
    box-shadow: var(--shadow);
  }

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

  .primary-nav a {
    display: block;
    width: 100%;
    padding: 0.8rem 0.75rem;
    border-bottom: 1px solid var(--c-border);
  }

  .primary-nav a::before {
    display: none;
  }

  .primary-nav a:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 680px) {
  .container {
    width: calc(100% - 1.5rem);
  }

  .section {
    padding-block: 2.5rem;
  }

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

@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;
  }
}