:root {
  color-scheme: dark;
  --bg: #050607;
  --bg-soft: #0a0d10;
  --surface: rgba(12, 15, 18, 0.72);
  --surface-strong: rgba(16, 20, 24, 0.88);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(95, 235, 255, 0.24);
  --text: #f5f7f8;
  --muted: #a8b0b8;
  --faint: #68727c;
  --accent: #5fe7ff;
  --accent-strong: #9ff3ff;
  --shadow: rgba(0, 0, 0, 0.38);
  --glow: rgba(95, 231, 255, 0.24);
  --radius: 8px;
  --header-height: 96px;
  font-family: Inter, Geist, Manrope, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f7f8;
  --bg-soft: #e9eef1;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --border: rgba(10, 15, 20, 0.12);
  --border-strong: rgba(0, 145, 170, 0.26);
  --text: #11171c;
  --muted: #52606b;
  --faint: #73808a;
  --accent: #007d98;
  --accent-strong: #005f73;
  --shadow: rgba(20, 34, 45, 0.14);
  --glow: rgba(0, 125, 152, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  letter-spacing: 0;
  background:
    linear-gradient(125deg, var(--bg) 0%, var(--bg-soft) 54%, var(--bg) 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(to bottom, transparent, black 18%, black 78%, transparent);
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 78%, transparent);
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.ambient-canvas {
  position: fixed;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.site-shell {
  position: relative;
  display: grid;
  min-height: 100vh;
  grid-template-rows: auto 1fr auto;
  padding: 24px;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 10;
  display: flex;
  justify-content: center;
}

.navbar {
  display: flex;
  width: min(100%, 980px);
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  box-shadow: 0 18px 50px var(--shadow), 0 0 36px rgba(95, 231, 255, 0.06);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 10px;
  padding: 0 10px 0 6px;
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 750;
}

.brand-mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--accent-strong);
  background: rgba(95, 231, 255, 0.08);
  box-shadow: inset 0 0 18px rgba(95, 231, 255, 0.08);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 160ms ease, opacity 160ms ease;
}

.menu-toggle span + span {
  margin-top: 4px;
}

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

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

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-menu {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

.nav-links,
.nav-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius);
  padding: 0 13px;
  color: var(--muted);
  font-size: 0.93rem;
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
  background: rgba(95, 231, 255, 0.08);
  box-shadow: 0 0 18px rgba(95, 231, 255, 0.08);
}

.icon-button {
  position: relative;
  display: inline-grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: transform 160ms ease, color 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.icon-button svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.icon-button:hover,
.icon-button:focus-visible {
  color: var(--accent-strong);
  border-color: var(--border-strong);
  background: rgba(95, 231, 255, 0.08);
  box-shadow: 0 0 22px var(--glow);
  transform: translateY(-1px);
}

.theme-icon {
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-radius: 50%;
  box-shadow: inset -5px -4px 0 0 currentColor;
}

:root[data-theme="light"] .theme-icon {
  border-width: 2px;
  box-shadow: inset 0 0 0 5px transparent, 0 0 0 4px rgba(0, 125, 152, 0.1);
}

.hero {
  display: grid;
  min-height: calc(100vh - var(--header-height) - 84px);
  place-items: center;
  padding: 78px 0 64px;
}

.profile-card {
  width: min(100%, 430px);
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), transparent 42%),
    var(--surface);
  box-shadow: 0 22px 70px var(--shadow), 0 0 54px rgba(95, 231, 255, 0.08);
  text-align: center;
  -webkit-backdrop-filter: blur(22px);
  backdrop-filter: blur(22px);
  animation: card-enter 520ms ease both;
}

.avatar-shell {
  display: grid;
  width: 118px;
  height: 118px;
  place-items: center;
  margin: 0 auto 18px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(95, 231, 255, 0.16), rgba(255, 255, 255, 0.03)),
    rgba(255, 255, 255, 0.02);
  box-shadow: 0 0 34px rgba(95, 231, 255, 0.12);
}

.avatar-image {
  display: block;
  width: 96px;
  height: 96px;
  object-fit: contain;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: rgba(5, 6, 7, 0.52);
}

.signal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.signal-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.profile-card h1 {
  margin: 0;
  color: var(--text);
  font-size: 2.7rem;
  line-height: 1.04;
  font-weight: 820;
}

.tagline {
  max-width: 300px;
  margin: 12px auto 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.6;
}

.error-card {
  width: min(100%, 460px);
}

.error-code {
  margin: 4px 0 8px;
  color: var(--accent-strong);
  font-size: 5rem;
  line-height: 0.95;
  font-weight: 860;
  text-shadow: 0 0 28px var(--glow);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}

.primary-link,
.secondary-link {
  display: inline-flex;
  min-width: 132px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  padding: 0 18px;
  font-size: 0.92rem;
  font-weight: 700;
  transition: transform 160ms ease, color 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.primary-link {
  border: 1px solid var(--border-strong);
  color: #031014;
  background: var(--accent);
  box-shadow: 0 0 22px var(--glow);
}

.secondary-link {
  border: 1px solid var(--border);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
}

.primary-link:hover,
.primary-link:focus-visible,
.secondary-link:hover,
.secondary-link:focus-visible {
  transform: translateY(-1px);
}

.primary-link:hover,
.primary-link:focus-visible {
  background: var(--accent-strong);
  box-shadow: 0 0 28px var(--glow);
}

.secondary-link:hover,
.secondary-link:focus-visible {
  color: var(--accent-strong);
  border-color: var(--border-strong);
  background: rgba(95, 231, 255, 0.08);
  box-shadow: 0 0 20px var(--glow);
}

.error-note {
  margin: 24px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--faint);
  font-size: 0.86rem;
  line-height: 1.6;
}

.social-links {
  display: flex;
  min-height: 46px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 24px 0 22px;
}

.social-link {
  display: inline-grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
  transition: transform 160ms ease, color 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.social-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.social-link:hover,
.social-link:focus-visible {
  color: var(--accent-strong);
  border-color: var(--border-strong);
  background: rgba(95, 231, 255, 0.08);
  box-shadow: 0 0 24px var(--glow);
  transform: translateY(-2px) scale(1.03);
}

.social-link[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
}

.social-link[aria-disabled="true"]:hover,
.social-link[aria-disabled="true"]:focus-visible {
  color: var(--muted);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.035);
  box-shadow: none;
  transform: none;
}

.route-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.route-strip a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.86rem;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.route-strip a:hover,
.route-strip a:focus-visible {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(95, 231, 255, 0.07);
  box-shadow: 0 0 18px rgba(95, 231, 255, 0.08);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 14px;
  padding: 14px 0 4px;
  color: var(--faint);
  font-size: 0.84rem;
}

.site-footer span:first-child {
  color: var(--muted);
  font-weight: 700;
}

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

@keyframes card-enter {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .site-shell {
    padding: 14px;
  }

  .site-header {
    top: 10px;
  }

  .navbar {
    position: relative;
    min-height: 58px;
  }

  .menu-toggle {
    display: grid;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    left: 0;
    display: grid;
    grid-template-rows: 1fr auto;
    gap: 10px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-strong);
    box-shadow: 0 18px 50px var(--shadow);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
  }

  .nav-menu.is-open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .nav-links a {
    justify-content: center;
    min-height: 46px;
    background: rgba(255, 255, 255, 0.03);
  }

  .nav-actions {
    justify-content: center;
  }

  .hero {
    min-height: calc(100vh - 86px);
    padding: 48px 0 40px;
  }

  :root.nav-open .hero {
    padding-top: 220px;
  }

  .profile-card {
    padding: 28px 20px 22px;
  }

  .profile-card h1 {
    font-size: 2.25rem;
  }

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

@media (max-width: 420px) {
  .brand {
    font-size: 0.88rem;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .profile-card {
    padding: 24px 16px 18px;
  }

  .avatar-shell {
    width: 104px;
    height: 104px;
  }

  .avatar-image {
    width: 84px;
    height: 84px;
  }

  .tagline {
    font-size: 0.98rem;
  }

  .error-code {
    font-size: 4.2rem;
  }

  .primary-link,
  .secondary-link {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}