:root {
  --space-navy: #0B0E1A;
  --deep-blue: #1A1B4B;
  --bright-cyan: #00E5FF;
  --gold: #F0B90B;
  --gold-light: #F6D776;
  --text-primary: #E8ECF3;
  --text-secondary: #A0AABF;
  --border-subtle: #3A3F6B;
  --surface-alt: #12152B;
  --glow-gradient: linear-gradient(135deg, #1A1B4B 0%, #00E5FF 100%);
  --font-heading: "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --h1-size: 2.5rem;
  --h2-size: 1.75rem;
  --h3-size: 1.25rem;
  --header-height: 88px;
  --header-height-mobile: 76px;
  --content-max: 1200px;
  --radius: 20px;
  --shadow-hard: 10px 10px 0 rgba(0, 0, 0, 0.28);
  --transition: 160ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  margin: 0;
  background: var(--space-navy);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 8%, rgba(26, 27, 75, 0.35), transparent 32rem),
    linear-gradient(180deg, #0B0E1A 0%, #0D1023 100%);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  left: clamp(0.75rem, 2vw, 2rem);
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(26, 27, 75, 0.6), rgba(0, 229, 255, 0.5), rgba(240, 185, 11, 0.4));
  opacity: 0.55;
  z-index: 1;
  pointer-events: none;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: var(--bright-cyan);
  text-decoration: none;
}

a:hover {
  color: var(--gold-light);
}

p,
ul,
ol {
  margin: 0 0 1.25rem;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--h1-size);
}

h2 {
  font-size: var(--h2-size);
}

h3 {
  font-size: var(--h3-size);
}

::selection {
  background: var(--bright-cyan);
  color: var(--space-navy);
}

:focus-visible {
  outline: 2px solid var(--bright-cyan);
  outline-offset: 4px;
  border-radius: 4px;
}

#main-content {
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 14, 26, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 2px solid var(--border-subtle);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 5%;
  right: 5%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--bright-cyan) 45%, var(--gold) 80%, transparent);
  opacity: 0.75;
}

.header-shell {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 1.75rem;
  width: min(1440px, calc(100% - clamp(1.5rem, 5vw, 4rem)));
  margin-inline: auto;
  min-height: var(--header-height);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 200;
  padding: 0.75rem 1.25rem;
  border-radius: 14px;
  background: var(--surface-alt);
  border: 2px solid var(--bright-cyan);
  color: var(--bright-cyan);
  font-weight: 700;
  box-shadow: var(--shadow-hard);
  transition: top var(--transition);
}

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

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-lockup:hover .brand-lockup__text {
  color: var(--bright-cyan);
}

.brand-lockup__icon {
  display: grid;
  place-items: center;
}

.brand-svg {
  width: 112px;
  height: 38px;
  overflow: visible;
}

.brand-lockup__text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  white-space: nowrap;
  transition: color var(--transition);
}

.header-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.2rem, 0.9vw, 0.9rem);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.65em 0.85em;
  color: var(--text-secondary);
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  right: 50%;
  bottom: 6px;
  height: 2px;
  background: linear-gradient(90deg, var(--bright-cyan), var(--gold));
  transition: left var(--transition), right var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.08);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  left: 0.9em;
  right: 0.9em;
}

.nav-link[aria-current="page"] {
  color: var(--bright-cyan);
  background: rgba(0, 229, 255, 0.08);
}

.header-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid rgba(0, 229, 255, 0.55);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(26, 27, 75, 0.9), rgba(0, 229, 255, 0.85));
  color: #06121A;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  white-space: nowrap;
  box-shadow: 0 0 22px rgba(0, 229, 255, 0.18), 6px 6px 0 rgba(0, 0, 0, 0.22);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.header-download:hover {
  color: #0B0E1A;
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.35), 8px 8px 0 rgba(0, 0, 0, 0.2);
}

.header-download:active {
  transform: translateY(1px);
  box-shadow: 0 2px 12px rgba(0, 229, 255, 0.12), 2px 2px 0 rgba(0, 0, 0, 0.2);
}

.nav-toggle {
  display: none;
}

.header-track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(58, 63, 107, 0.45);
  pointer-events: none;
  z-index: 2;
}

.scroll-progress,
[data-scroll-progress] {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--bright-cyan), var(--gold));
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
  will-change: width;
}

.site-footer {
  position: relative;
  margin-top: 4rem;
  background: linear-gradient(180deg, rgba(18, 21, 43, 0.92), rgba(11, 14, 26, 1));
  border-top: 2px solid var(--border-subtle);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--deep-blue), var(--bright-cyan), var(--gold));
  opacity: 0.85;
}

.footer-glow {
  position: absolute;
  top: -8rem;
  right: -6rem;
  width: 24rem;
  height: 24rem;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.14), transparent 70%);
  pointer-events: none;
}

.footer-shell {
  position: relative;
  width: min(1200px, calc(100% - clamp(1.5rem, 5vw, 4rem)));
  margin-inline: auto;
  padding: 3rem 0 1.5rem;
}

.footer-brand {
  max-width: 36rem;
  margin-bottom: 2rem;
}

.footer-brand-name {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition);
}

.footer-brand-name:hover {
  color: var(--bright-cyan);
}

.brand-suffix {
  color: var(--bright-cyan);
}

.footer-about {
  color: var(--text-secondary);
  margin-top: 0.75rem;
}

.footer-trust {
  border-left: 3px solid var(--gold);
  border-radius: 0 14px 14px 0;
  padding: 0.75rem 1rem;
  background: rgba(240, 185, 11, 0.07);
  color: #E2D9B0;
  font-size: 0.95rem;
  margin-top: 1.25rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.4fr;
  gap: 2rem;
  padding: 2rem 0 1.5rem;
  border-top: 1px solid rgba(58, 63, 107, 0.6);
  border-bottom: 1px solid rgba(58, 63, 107, 0.6);
}

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

.footer-heading {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 1rem;
}

.footer-list a {
  color: var(--text-secondary);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-list a:hover {
  color: var(--bright-cyan);
  padding-left: 0.25rem;
}

.footer-list li,
.footer-contact-list li {
  margin-bottom: 0.55rem;
}

.footer-contact-list {
  color: var(--text-secondary);
}

.footer-contact-label {
  color: var(--gold-light);
  font-weight: 600;
  margin-right: 0.4rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-bottom p {
  margin: 0;
}

.footer-bottom a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.footer-bottom a:hover {
  color: var(--bright-cyan);
}

.content-shell {
  width: min(var(--content-max), calc(100% - clamp(1.5rem, 5vw, 4rem)));
  margin-inline: auto;
}

.breadcrumbs {
  padding: 1.5rem 0 0.5rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

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

.breadcrumb-link {
  color: var(--text-secondary);
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border: 2px solid transparent;
  border-radius: 999px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

.btn--primary {
  background: linear-gradient(135deg, var(--deep-blue), var(--bright-cyan));
  color: #0B0E1A;
  border-color: rgba(255, 255, 255, 0.18);
  box-shadow: 0 10px 28px rgba(0, 229, 255, 0.2), 8px 8px 0 rgba(0, 0, 0, 0.25);
}

.btn--primary:hover {
  color: #0B0E1A;
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(0, 229, 255, 0.28), 10px 10px 0 rgba(0, 0, 0, 0.2);
}

.btn--primary:active {
  transform: translateY(1px);
  box-shadow: 0 2px 12px rgba(0, 229, 255, 0.12), 2px 2px 0 rgba(0, 0, 0, 0.2);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-subtle);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.15);
}

.btn--ghost:hover {
  color: var(--bright-cyan);
  border-color: var(--bright-cyan);
  transform: translateY(-2px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.2);
}

.section {
  padding-block: 3rem;
}

.section--tight {
  padding-block: 1.5rem;
}

.section-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.section-title {
  position: relative;
  margin-bottom: 0;
}

.section-title::after {
  content: "";
  display: inline-block;
  width: 2.25rem;
  height: 4px;
  margin-left: 0.75rem;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--bright-cyan), var(--gold));
  vertical-align: middle;
}

.section-intro {
  max-width: 56rem;
  color: var(--text-secondary);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.media-frame {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(26, 27, 75, 0.45), rgba(0, 229, 255, 0.06));
  box-shadow: var(--shadow-hard);
  aspect-ratio: 16 / 10;
  min-height: 240px;
}

.media-frame::before {
  content: "";
  position: absolute;
  width: 120%;
  height: 80%;
  top: -40%;
  left: -10%;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.3), transparent 60%);
  border-radius: 50%;
  transform: rotate(-8deg);
  filter: blur(6px);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(0, 229, 255, 0.16), transparent 60%);
}

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

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

.media-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.media-caption {
  padding: 0.75rem 0 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-list {
  display: grid;
  gap: 1.5rem;
}

.article-card {
  padding: 1.5rem;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius);
  background: var(--surface-alt);
  box-shadow: var(--shadow-hard);
  transition: border-color var(--transition), transform var(--transition);
}

.article-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 255, 0.5);
}

.article-link {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.article-link:hover {
  color: var(--bright-cyan);
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.path-track {
  position: relative;
  margin: 2rem 0;
  padding: 0 0 0 3.25rem;
}

.path-track::before {
  content: "";
  position: absolute;
  left: 0.85rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--deep-blue), var(--bright-cyan), var(--gold));
  opacity: 0.7;
}

.path-step {
  position: relative;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius);
  background: var(--surface-alt);
  box-shadow: var(--shadow-hard);
}

.path-step::before {
  content: attr(data-step);
  position: absolute;
  left: -3.1rem;
  top: 1.5rem;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--space-navy);
  box-shadow: 0 0 0 2px var(--gold);
  color: var(--space-navy);
  font-weight: 700;
}

.path-step__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.path-step__text {
  color: var(--text-secondary);
  margin: 0;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.metric {
  border-left: 3px solid var(--gold);
  border-radius: 0 12px 12px 0;
  padding: 0.5rem 1rem;
  background: rgba(240, 185, 11, 0.06);
}

.metric__value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--gold-light);
  line-height: 1.1;
}

.metric__label {
  display: block;
  margin-top: 0.25rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(240, 185, 11, 0.35);
  border-radius: var(--radius);
  background: rgba(240, 185, 11, 0.06);
  color: var(--text-primary);
}

.notice::before {
  content: "✦";
  color: var(--gold);
  font-size: 1.25rem;
  line-height: 1;
}

.prose {
  max-width: 72ch;
}

.prose p {
  color: var(--text-secondary);
}

.prose h2 {
  margin-top: 2rem;
}

@media (max-width: 900px) {
  .header-shell {
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    min-height: var(--header-height-mobile);
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }

  .brand-lockup {
    margin-right: 0;
  }

  .brand-lockup__text {
    font-size: 0.95rem;
  }

  .brand-svg {
    width: 96px;
    height: 32px;
  }

  .header-download {
    order: 2;
    margin-left: auto;
    padding: 0.55rem 1rem;
    font-size: 0.9rem;
  }

  .nav-toggle {
    order: 3;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    background: var(--surface-alt);
    color: var(--text-primary);
    cursor: pointer;
  }

  .nav-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 99px;
    background: var(--bright-cyan);
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(6px) 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(-6px) rotate(-45deg);
  }

  .header-nav {
    order: 4;
    display: none;
    width: 100%;
    margin-left: 0;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-subtle);
  }

  .header-nav[data-open],
  [data-nav][data-open] {
    display: block;
    max-height: calc(100vh - var(--header-height-mobile));
    overflow-y: auto;
  }

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

  .nav-link {
    display: block;
    border-radius: 12px;
    padding: 0.85rem 1rem;
  }

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

  .nav-link[aria-current="page"] {
    background: rgba(0, 229, 255, 0.1);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-contact {
    grid-column: span 2;
  }

  .metric-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .section {
    padding-block: 2rem;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-contact {
    grid-column: auto;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .path-track {
    padding-left: 2.75rem;
  }

  .path-step::before {
    left: -2.6rem;
  }
}

@media (max-width: 560px) {
  .brand-lockup__text {
    display: none;
  }

  .header-shell {
    gap: 0.5rem;
  }

  .header-download {
    padding: 0.55rem 0.85rem;
  }
}

@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;
  }
}