:root {
  --color-space: #0A1428;
  --color-nebula: #1A2B4D;
  --color-orange: #FF6B35;
  --color-purple: #A855F7;
  --color-meteor: #F8FAFC;
  --color-starlight: #CBD5E1;
  --color-midnight: #09090B;
  --gradient-cosmic: linear-gradient(135deg, #0A1428 0%, #1A2B4D 55%, #A855F7 100%);
  --font-heading: "Space Grotesk", "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;
  --container-width: 1280px;
  --section-space: clamp(3rem, 7vw, 5.5rem);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

html {
  background: var(--color-space);
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-space);
  color: var(--color-starlight);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body[data-open] {
  overflow: hidden;
}

#main-content {
  width: 100%;
  flex: 1 0 auto;
  scroll-margin-top: 6rem;
  outline: none;
}

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

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

:focus:not(:focus-visible) {
  outline: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.75em;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-meteor);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.75rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 1rem;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: max(1.25rem, 4vw);
}

.container-narrow {
  max-width: 880px;
}

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.65rem 1rem;
  background: var(--color-orange);
  color: var(--color-midnight);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(calc(-100% - 1.25rem));
  transition: transform 0.18s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background:
    radial-gradient(circle at 8% 20%, rgba(168, 85, 247, 0.18), transparent 14px),
    radial-gradient(circle at 82% 65%, rgba(255, 107, 53, 0.12), transparent 12px),
    rgba(10, 20, 40, 0.86);
  border-bottom: 1px solid rgba(168, 85, 247, 0.22);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header[data-scrolled] {
  background: rgba(9, 9, 11, 0.92);
  box-shadow: 0 12px 30px rgba(9, 9, 11, 0.32);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 0.85rem max(1.25rem, 4vw);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: block;
  width: 2.25rem;
  height: 2.25rem;
  flex: 0 0 auto;
  background: linear-gradient(135deg, var(--color-orange) 0%, var(--color-purple) 100%);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  background: var(--color-space);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--color-meteor);
}

.brand-tagline {
  margin-top: 0.3rem;
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-starlight);
}

.brand--footer .brand-mark {
  width: 1.75rem;
  height: 1.75rem;
}

.brand--footer .brand-name {
  font-size: 1rem;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.375rem;
  padding: 0.55rem 0.6rem;
  color: var(--color-starlight);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.nav-label {
  display: inline-block;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0;
  color: var(--color-purple);
}

.nav-link:hover {
  color: var(--color-meteor);
  background: rgba(168, 85, 247, 0.08);
}

.nav-link[aria-current="page"] {
  color: var(--color-meteor);
  border-bottom-color: var(--color-orange);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-cta {
  flex: 0 0 auto;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.1rem;
  background: rgba(168, 85, 247, 0.14);
  color: var(--color-meteor);
  border: 1px solid rgba(168, 85, 247, 0.35);
  border-radius: 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  line-height: 1;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.button-primary {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: var(--color-midnight);
}

.button-primary:hover {
  background: #ff7d4d;
  border-color: #ff7d4d;
  color: var(--color-midnight);
  transform: translateY(-1px);
}

.button-ghost {
  background: transparent;
  border-color: rgba(203, 213, 225, 0.35);
  color: var(--color-starlight);
}

.button-ghost:hover {
  border-color: var(--color-purple);
  color: var(--color-meteor);
}

.button-sm {
  padding: 0.5rem 0.875rem;
  font-size: 0.75rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  background: transparent;
  border: 1px solid rgba(203, 213, 225, 0.2);
  border-radius: 0;
}

.nav-toggle-bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  margin: 3px 0;
  background: var(--color-meteor);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-purple));
  transition: width 0.12s linear;
  pointer-events: none;
}

@media (max-width: 900px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 0.25rem max(1.25rem, 4vw) 1rem;
    background: rgba(9, 9, 11, 0.98);
    border-bottom: 1px solid rgba(168, 85, 247, 0.3);
    box-shadow: 0 20px 40px rgba(9, 9, 11, 0.35);
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-list {
    display: grid;
    gap: 0.125rem;
  }

  .nav-link {
    align-items: center;
    padding: 0.875rem 0.5rem;
    border-bottom: 1px solid rgba(203, 213, 225, 0.08);
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--color-orange);
    background: rgba(255, 107, 53, 0.08);
  }

  .nav-index {
    width: 1.5rem;
    color: var(--color-orange);
  }

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

@media (max-width: 520px) {
  .brand-tagline {
    display: none;
  }

  .header-cta {
    display: none;
  }
}

.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, var(--color-space) 0%, var(--color-midnight) 140%);
  border-top: 1px solid rgba(168, 85, 247, 0.22);
  color: var(--color-starlight);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 2rem;
}

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

.footer-about-text {
  margin: 1rem 0 0.75rem;
  max-width: 42ch;
}

.footer-trust {
  max-width: 52ch;
  margin: 0;
  padding: 0.75rem;
  background: rgba(168, 85, 247, 0.08);
  border-left: 2px solid var(--color-purple);
  font-size: 0.8125rem;
}

.footer-title {
  margin: 0 0 1rem;
  padding-left: 0.65rem;
  border-left: 3px solid var(--color-orange);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-meteor);
}

.footer-list {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  color: var(--color-starlight);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-link:hover {
  color: var(--color-purple);
  padding-left: 0.2rem;
}

.footer-text {
  margin: 0 0 0.5rem;
}

.footer-note {
  margin-top: 1rem;
  font-size: 0.8125rem;
  color: var(--color-starlight);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid rgba(203, 213, 225, 0.12);
  font-size: 0.8125rem;
  color: var(--color-starlight);
}

.footer-bottom p {
  margin: 0;
}

@media (max-width: 1023px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

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

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

.section-tight {
  padding-block: clamp(1.75rem, 4vw, 3rem);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2rem;
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2.75rem);
}

.section-intro {
  margin: 0;
  color: var(--color-starlight);
  font-size: 1.0625rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

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

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

.grid--align-center {
  align-items: center;
}

@media (max-width: 980px) and (min-width: 641px) {
  .grid--three {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid--two,
  .grid--three {
    grid-template-columns: 1fr;
  }
}

.card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.35rem;
  background: linear-gradient(145deg, rgba(26, 43, 77, 0.85), rgba(10, 20, 40, 0.95));
  border: 1px solid rgba(203, 213, 225, 0.12);
  border-top: 2px solid var(--color-purple);
  box-shadow: 0 10px 30px rgba(9, 9, 11, 0.16);
}

.card--accent {
  border-top-color: var(--color-orange);
}

.card-title {
  margin: 0;
  font-size: 1.125rem;
}

.card-text {
  margin: 0;
  color: var(--color-starlight);
  font-size: 0.9375rem;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background: rgba(168, 85, 247, 0.15);
  color: var(--color-meteor);
  border: 1px solid rgba(168, 85, 247, 0.35);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tag--orange {
  background: rgba(255, 107, 53, 0.15);
  border-color: rgba(255, 107, 53, 0.4);
  color: var(--color-orange);
}

.breadcrumbs {
  margin: 0 0 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.25rem;
  color: var(--color-purple);
}

.breadcrumb-link {
  color: var(--color-starlight);
  text-decoration: none;
}

.breadcrumb-link:hover {
  color: var(--color-orange);
}

.breadcrumb-current {
  color: var(--color-meteor);
  font-weight: 600;
}

.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--color-nebula);
}

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

.media--4-3::before {
  padding-top: 75%;
}

.media--1-1::before {
  padding-top: 100%;
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(168, 85, 247, 0.18));
  pointer-events: none;
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@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;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}