:root {
  --c-bg: #0A192F;
  --c-bg-alt: #112240;
  --c-bg-deep: #020C1B;
  --c-neon: #64FFDA;
  --c-orange: #FF6B6B;
  --c-white: #E6F1FF;
  --c-gray: #8892B0;
  --c-line: #233554;
  --font-heading: 'Space Grotesk', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', 'Consolas', monospace;
  --header-h: 72px;
  --border-w: 2px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --max-w: 1440px;
  --radius: 6px;
  --shadow: 4px 4px 0 rgba(2, 12, 27, 0.45);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 5rem;
}

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

* {
  margin: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-white);
  background: var(--c-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(35, 53, 84, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 53, 84, 0.16) 1px, transparent 1px);
  background-size: 32px 32px;
}

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

p {
  color: var(--c-white);
}

a {
  color: var(--c-neon);
}

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

ul,
ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

::selection {
  background: var(--c-neon);
  color: var(--c-bg-deep);
}

:focus-visible {
  outline: 3px solid var(--c-orange);
  outline-offset: 2px;
}

#main-content {
  flex: 1 0 auto;
  width: 100%;
  outline: none;
  scroll-margin-top: calc(var(--header-h) + var(--border-w) + 1rem);
}

.site-container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.site-skip-link {
  position: fixed;
  top: -100px;
  left: var(--gutter);
  z-index: 3000;
  background: var(--c-orange);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  padding: 0.75rem 1.25rem;
  border: 2px solid var(--c-white);
  border-radius: var(--radius);
  transition: top 0.2s ease;
}

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

.site-command {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--c-bg-deep);
  border-bottom: var(--border-w) solid var(--c-line);
}

.site-command__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-h);
}

.site-command__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--c-white);
  flex-shrink: 0;
}

.site-command__signal {
  position: relative;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 2px solid var(--c-neon);
  border-radius: 50%;
  background: rgba(100, 255, 218, 0.06);
}

.site-command__signal::before {
  content: "";
  position: absolute;
  inset: -6px;
  border: 1px dashed var(--c-neon);
  border-radius: 50%;
  opacity: 0.45;
}

.site-command__signal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-neon);
}

.site-command__brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.site-command__brand-text {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-white);
  white-space: nowrap;
}

.site-command__tagline {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--c-neon);
}

.site-command__toggle {
  display: none;
}

.site-command__nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.site-command__nav-item {
  position: relative;
}

.site-command__link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.7rem;
  border: var(--border-w) solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-white);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.site-command__link:hover {
  color: var(--c-neon);
  background: var(--c-bg-alt);
  border-color: var(--c-line);
}

.site-command__link[aria-current="page"] {
  color: var(--c-neon);
  background: rgba(100, 255, 218, 0.08);
  border-color: var(--c-neon);
}

.site-command__index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-gray);
  line-height: 1;
}

.site-command__link[aria-current="page"] .site-command__index {
  color: var(--c-neon);
}

.site-command__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0%;
  max-width: 100%;
  background: var(--c-neon);
  transition: width 0.15s ease-out;
  pointer-events: none;
}

.site-footer {
  background: var(--c-bg-deep);
  border-top: var(--border-w) solid var(--c-line);
  color: var(--c-white);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 34%;
  max-width: 480px;
  height: 3px;
  background: var(--c-neon);
  z-index: 1;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-8);
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.site-footer__statement {
  max-width: 560px;
}

.site-footer__brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.3;
  margin-bottom: var(--space-4);
}

.site-footer__brand-sep {
  color: var(--c-neon);
  margin: 0 0.4em;
}

.site-footer__trust {
  color: var(--c-gray);
  font-size: 0.95rem;
  max-width: 36ch;
}

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.site-footer__column--contact {
  min-width: 210px;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  font-weight: 500;
  color: var(--c-neon);
  margin-bottom: var(--space-4);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-line);
}

.site-footer__list li {
  margin-bottom: 0.5rem;
}

.site-footer__link {
  color: var(--c-white);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__link:hover {
  color: var(--c-neon);
  padding-left: 3px;
}

.site-footer__link--arrow::after {
  content: " ↗";
  font-family: var(--font-mono);
  font-size: 0.8em;
  color: var(--c-neon);
}

.site-footer__contact-line {
  color: var(--c-white);
  font-size: 0.88rem;
  line-height: 1.6;
}

.site-footer__mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.site-footer__address {
  color: var(--c-gray);
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

.site-footer__meta {
  border-top: 1px solid var(--c-line);
  padding: 1rem 0;
}

.site-footer__meta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-footer__icp,
.site-footer__copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-gray);
}

.site-section {
  padding-top: clamp(3rem, 8vw, 6rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.site-section--alt {
  background: var(--c-bg-alt);
  border-top: var(--border-w) solid var(--c-line);
  border-bottom: var(--border-w) solid var(--c-line);
}

.site-section__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  max-width: 720px;
}

.site-section__title {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.15;
}

.site-section__desc {
  color: var(--c-gray);
  font-size: 1rem;
  max-width: 56ch;
}

.site-grid {
  display: grid;
  gap: var(--space-5);
}

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

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

.site-grid--split {
  grid-template-columns: 3fr 2fr;
  gap: var(--space-8);
}

.site-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  background: var(--c-bg-alt);
  border: var(--border-w) solid var(--c-line);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.site-card:hover {
  border-color: var(--c-neon);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(2, 12, 27, 0.35);
}

.site-card__tag {
  align-self: flex-start;
}

.site-card__title {
  font-size: 1.15rem;
  margin: 0;
}

.site-card__title a {
  color: var(--c-white);
  text-decoration: none;
}

.site-card__title a:hover {
  color: var(--c-neon);
}

.site-card__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-gray);
}

.site-card__desc {
  color: var(--c-gray);
  font-size: 0.9rem;
}

.site-card__footer {
  margin-top: auto;
  padding-top: var(--space-3);
}

.site-tag {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--c-neon);
  background: rgba(100, 255, 218, 0.08);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  white-space: nowrap;
}

.site-tag--orange {
  color: var(--c-orange);
  background: rgba(255, 107, 107, 0.08);
  border-color: rgba(255, 107, 107, 0.3);
}

.site-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: var(--border-w) solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-bg-alt);
  color: var(--c-white);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 3px 3px 0 rgba(2, 12, 27, 0.4);
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.site-btn:hover {
  color: var(--c-neon);
  border-color: var(--c-neon);
  box-shadow: 4px 4px 0 rgba(2, 12, 27, 0.5);
  transform: translate(-1px, -1px);
}

.site-btn:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 rgba(2, 12, 27, 0.4);
}

.site-btn--primary {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: var(--c-bg-deep);
}

.site-btn--primary:hover {
  background: transparent;
  color: var(--c-neon);
}

.site-btn--ghost {
  background: transparent;
  border-color: var(--c-line);
  color: var(--c-white);
}

.site-btn--ghost:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.site-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-gray);
  margin: 0;
  padding-top: 1.5rem;
}

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

.site-breadcrumb li + li::before {
  content: "/";
  color: var(--c-line);
}

.site-breadcrumb a {
  color: var(--c-gray);
  text-decoration: none;
}

.site-breadcrumb a:hover {
  color: var(--c-neon);
}

.site-breadcrumb [aria-current="page"] {
  color: var(--c-white);
}

.site-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: var(--border-w) solid var(--c-line);
  background-color: var(--c-bg-alt);
  background-image: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(35, 53, 84, 0.4) 10px,
    rgba(35, 53, 84, 0.4) 11px
  );
  aspect-ratio: 16 / 9;
}

.site-media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

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

.site-notice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border: 1px solid rgba(255, 107, 107, 0.4);
  border-left: 4px solid var(--c-orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 107, 107, 0.06);
  color: var(--c-white);
  font-size: 0.9rem;
}

.site-notice::before {
  content: "!";
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--c-orange);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.2rem;
}

.site-divider {
  height: 2px;
  border: none;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-line) 60%, var(--c-line) 100%);
  margin: var(--space-8) 0;
}

.site-mono {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.site-index-list {
  display: flex;
  flex-direction: column;
}

.site-index-list__item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--c-line);
}

.site-index-list__item:last-child {
  border-bottom: none;
}

.site-index-list__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-gray);
  min-width: 2em;
}

.site-index-list__link {
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--c-white);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-index-list__link:hover {
  color: var(--c-neon);
}

@media (max-width: 1100px) {
  .site-command__link {
    font-size: 0.8rem;
    padding: 0.5rem 0.5rem;
  }

  .site-footer__grid {
    gap: var(--space-6);
  }

  .site-footer__columns {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }

  .site-footer__column--contact {
    min-width: 180px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 64px;
  }

  .site-command__toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border: var(--border-w) solid var(--c-line);
    border-radius: var(--radius);
    background: var(--c-bg-alt);
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--c-white);
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
  }

  .site-command__toggle:hover {
    border-color: var(--c-neon);
    color: var(--c-neon);
  }

  .site-command__toggle[aria-expanded="true"] {
    border-color: var(--c-neon);
    color: var(--c-neon);
  }

  .site-command__toggle-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
  }

  .site-command__toggle-icon {
    position: relative;
    width: 16px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: background-color 0.2s ease;
  }

  .site-command__toggle-icon::before,
  .site-command__toggle-icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 16px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: transform 0.2s ease, top 0.2s ease;
  }

  .site-command__toggle-icon::before {
    top: -5px;
  }

  .site-command__toggle-icon::after {
    top: 5px;
  }

  .site-command__toggle[aria-expanded="true"] .site-command__toggle-icon {
    background: transparent;
  }

  .site-command__toggle[aria-expanded="true"] .site-command__toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
  }

  .site-command__toggle[aria-expanded="true"] .site-command__toggle-icon::after {
    top: 0;
    transform: rotate(-45deg);
  }

  .site-command__nav {
    position: fixed;
    top: calc(var(--header-h) + var(--border-w));
    right: 0;
    width: min(320px, 85vw);
    height: calc(100vh - var(--header-h) - var(--border-w));
    background: var(--c-bg-deep);
    border-left: var(--border-w) solid var(--c-line);
    box-shadow: -6px 0 0 rgba(2, 12, 27, 0.35);
    padding: var(--space-5);
    overflow-y: auto;
    z-index: 1001;
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0s linear 0.25s;
  }

  .site-command__nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.25s ease, visibility 0s;
  }

  .site-command__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .site-command__link {
    font-size: 1rem;
    padding: 0.8rem 1rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .site-footer__statement {
    max-width: 100%;
  }

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

  .site-footer__column--contact {
    min-width: 0;
  }

  .site-grid--split {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-footer__columns {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

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

  .site-card:hover {
    transform: none;
    box-shadow: var(--shadow);
  }
}

@media (max-width: 420px) {
  .site-command__brand-text {
    font-size: 0.9rem;
  }

  .site-command__signal {
    width: 26px;
    height: 26px;
  }

  .site-command__toggle-label {
    display: none;
  }
}

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

  .site-command__nav {
    transition: none;
  }

  .site-command__toggle-icon,
  .site-command__toggle-icon::before,
  .site-command__toggle-icon::after {
    transition: none;
  }

  .site-command__progress {
    transition: none;
  }

  .site-command__link,
  .site-footer__link,
  .site-btn,
  .site-card,
  .site-index-list__link {
    transition: none;
  }
}