:root {
  --primary-bg: #0A0E17;
  --secondary-bg: #111827;
  --card-bg: #1F2937;
  --accent-green: #00FF87;
  --accent-orange: #FF6A00;
  --text-high: #FFFFFF;
  --text-mid: #A0AEC0;
  --text-low: #4A5568;
  --border: #2D3748;
  --data-blue: #00BFFF;
  --header-h: 76px;
  --header-h-scrolled: 60px;
  --container-w: 1200px;
  --radius-lg: 24px;
  --radius-md: 14px;
  --radius-pill: 999px;
  --font-sans: 'Inter', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', monospace;
  --transition: all 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--primary-bg);
  color: var(--text-high);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    radial-gradient(ellipse 60% 50% at 85% -10%, rgba(0, 255, 135, 0.06), transparent 60%),
    radial-gradient(ellipse 40% 40% at 0% 100%, rgba(0, 191, 255, 0.04), transparent 50%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: auto, auto, 32px 32px, 32px 32px;
}

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

ul,
ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding-left: clamp(20px, 4vw, 48px);
  padding-right: clamp(20px, 4vw, 48px);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 9999;
  padding: 10px 20px;
  background-color: var(--accent-green);
  color: #06281A;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius-pill);
  transform: translateY(-200%);
  transition: transform 0.25s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: calc(var(--progress, 0) * 1%);
  max-width: 100%;
  background-color: var(--accent-green);
  z-index: 10000;
  box-shadow: 0 0 12px rgba(0, 255, 135, 0.5);
  transition: width 0.1s linear;
}

@media (prefers-reduced-motion: reduce) {
  .progress-bar {
    transition: none;
  }
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, height 0.35s ease, border-color 0.35s ease, backdrop-filter 0.35s ease;
}

.site-header.is-scrolled {
  background-color: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  height: var(--header-h-scrolled);
  border-bottom-color: rgba(45, 55, 72, 0.6);
}

.site-header__inner {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding-left: clamp(20px, 4vw, 48px);
  padding-right: clamp(20px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.brand__mark {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 135, 0.15), 0 0 20px rgba(0, 255, 135, 0.4);
  flex-shrink: 0;
  animation: pulse-dot 3s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 4px rgba(0, 255, 135, 0.15), 0 0 18px rgba(0, 255, 135, 0.3); }
  50% { box-shadow: 0 0 0 6px rgba(0, 255, 135, 0.08), 0 0 28px rgba(0, 255, 135, 0.5); }
}

@media (prefers-reduced-motion: reduce) {
  .brand__mark {
    animation: none;
  }
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text-high);
}

.brand__tagline {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-mid);
  text-transform: uppercase;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1vw, 12px);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-mid);
  border-radius: var(--radius-pill);
  position: relative;
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.nav-link:hover {
  color: var(--text-high);
  background-color: rgba(255, 255, 255, 0.04);
}

.nav-link[aria-current="page"] {
  color: var(--accent-green);
  font-weight: 600;
}

.nav-link[aria-current="page"]::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 8px rgba(0, 255, 135, 0.7);
  flex-shrink: 0;
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-low);
  opacity: 0.7;
  transition: var(--transition);
}

.nav-link:hover .nav-link__index {
  color: var(--accent-green);
  opacity: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.header-search {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background-color: rgba(255, 255, 255, 0.03);
  transition: var(--transition);
}

.header-search__label {
  font-size: 0.82rem;
  color: var(--text-mid);
}

.header-search__shortcut {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-low);
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  transition: var(--transition);
  z-index: 1002;
}

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

.nav-toggle__line {
  width: 20px;
  height: 2px;
  background-color: var(--text-high);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background-color: var(--accent-green);
}

.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);
  background-color: var(--accent-green);
}

.site-footer {
  background-color: #070B12;
  border-top: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
  opacity: 0.5;
}

.site-footer__grid {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: clamp(64px, 8vw, 96px) clamp(20px, 4vw, 48px) 40px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 48px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-brand__mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 135, 0.12), 0 0 16px rgba(0, 255, 135, 0.3);
}

.footer-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.footer-brand__name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-high);
}

.footer-brand__tagline {
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-mid);
  text-transform: uppercase;
}

.footer-brand__desc {
  font-size: 0.88rem;
  color: var(--text-mid);
  max-width: 30ch;
  line-height: 1.7;
}

.footer-heading {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-mid);
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer-heading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background-color: var(--accent-green);
  border-radius: 2px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-mid);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-links a::before {
  content: "›";
  color: var(--accent-green);
  font-family: var(--font-mono);
  transition: var(--transition);
  opacity: 0.5;
}

.footer-links a:hover {
  color: var(--text-high);
  transform: translateX(4px);
}

.footer-links a:hover::before {
  opacity: 1;
}

.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-low);
}

.footer-contact a {
  font-size: 0.88rem;
  color: var(--text-mid);
  transition: var(--transition);
  word-break: break-all;
}

.footer-contact a:hover {
  color: var(--accent-green);
}

.footer-contact li > span:last-child {
  font-size: 0.88rem;
  color: var(--text-mid);
}

.site-footer__terminal {
  border-top: 1px solid var(--border);
  background-color: rgba(0, 0, 0, 0.3);
  max-width: 100%;
}

.terminal-bar {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 14px clamp(20px, 4vw, 48px);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #FF5F56;
}

.terminal-dot:nth-child(2) {
  background-color: #FFBD2E;
}

.terminal-dot:nth-child(3) {
  background-color: #27C93F;
}

.terminal-bar__name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-low);
  margin-left: 10px;
  letter-spacing: 0.04em;
}

.terminal-content {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 24px clamp(20px, 4vw, 48px) 28px;
}

.terminal-line {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 0.82rem;
  line-height: 1.6;
}

.terminal-line__prompt {
  font-family: var(--font-mono);
  color: var(--accent-green);
  flex-shrink: 0;
}

.terminal-line__cmd {
  font-family: var(--font-mono);
  color: var(--text-high);
  flex-shrink: 0;
}

.terminal-line__ok {
  font-family: var(--font-mono);
  color: var(--accent-green);
  background-color: rgba(0, 255, 135, 0.08);
  padding: 0 10px;
  border-radius: 4px;
  font-size: 0.75rem;
}

.terminal-line__msg {
  color: var(--text-mid);
  font-size: 0.82rem;
}

.footer-copyright {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  font-size: 0.78rem;
  color: var(--text-low);
  font-family: var(--font-mono);
}

.footer-copyright a {
  color: var(--text-mid);
  transition: var(--transition);
}

.footer-copyright a:hover {
  color: var(--accent-green);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  line-height: 1;
}

.button--primary {
  background-color: var(--accent-green);
  color: #06281A;
  box-shadow: 0 0 24px rgba(0, 255, 135, 0.2);
}

.button--primary:hover {
  box-shadow: 0 0 36px rgba(0, 255, 135, 0.4);
  transform: translateY(-2px);
}

.button--outline {
  background-color: transparent;
  border-color: var(--border);
  color: var(--text-high);
}

.button--outline:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  transform: translateY(-2px);
}

.page-hero {
  padding: calc(var(--header-h) + clamp(56px, 8vh, 96px)) clamp(20px, 4vw, 48px) clamp(48px, 6vh, 80px);
  position: relative;
}

.page-hero__container {
  max-width: var(--container-w);
  margin: 0 auto;
}

.page-hero__title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  max-width: 18ch;
}

.page-hero__lead {
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  color: var(--text-mid);
  max-width: 48ch;
  line-height: 1.8;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-low);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.breadcrumb a {
  color: var(--text-mid);
  transition: var(--transition);
}

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

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

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.section-index__code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-green);
  background-color: rgba(0, 255, 135, 0.08);
  border: 1px solid rgba(0, 255, 135, 0.2);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.05em;
}

.section-index__line {
  height: 1px;
  width: 48px;
  background: linear-gradient(90deg, var(--accent-green), transparent);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: 24px;
  margin-top: 40px;
  margin-bottom: 40px;
}

.card {
  background-color: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 255, 135, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.img-placeholder {
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--secondary-bg);
  background-image:
    linear-gradient(135deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%),
    linear-gradient(45deg, rgba(0, 255, 135, 0.06) 25%, transparent 25%),
    linear-gradient(315deg, rgba(0, 255, 135, 0.06) 25%, transparent 25%);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px, 12px 12px, 0 0;
  border: 1px solid var(--border);
}

.img-placeholder::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.img-placeholder[data-ratio="1-1"]::before {
  padding-top: 100%;
}

.img-placeholder[data-ratio="4-3"]::before {
  padding-top: 75%;
}

.img-placeholder[data-ratio="21-9"]::before {
  padding-top: 42.85%;
}

@media (max-width: 1100px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 900px) {
  .site-header {
    height: 64px;
  }
  .header-search {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(420px, 100vw);
    height: 100dvh;
    background-color: var(--primary-bg);
    border-left: 1px solid var(--border);
    transform: translateX(102%);
    transition: transform 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
    z-index: 1001;
    overflow-y: auto;
    padding: 96px 36px 48px;
    visibility: hidden;
  }
  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .nav-link {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
    color: var(--text-mid);
  }
  .nav-link__index {
    font-size: 0.8rem;
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    padding: 2px 10px;
    border-radius: var(--radius-pill);
  }
  .nav-link[aria-current="page"] {
    background-color: rgba(0, 255, 135, 0.06);
    color: var(--accent-green);
    border: 1px solid rgba(0, 255, 135, 0.2);
  }
  .nav-link[aria-current="page"]::before {
    display: none;
  }
}

@media (max-width: 600px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-top: 48px;
  }
  .footer-brand__desc {
    max-width: none;
  }
  .terminal-content {
    padding: 16px clamp(20px, 4vw, 48px) 20px;
  }
  .terminal-line {
    flex-direction: column;
    gap: 2px;
  }
  .footer-copyright {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .footer-copyright__sep {
    display: none;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
}