:root {
  --bg: #070707;
  --panel: rgba(255, 255, 255, 0.10);
  --text: #f5f5f5;
  --muted: #c9c9c9;
  --accent: #f2b544;
  --border: rgba(255, 255, 255, 0.14);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;

  background:
    radial-gradient(circle at center top,
      rgba(255,255,255,0.12) 0%,
      rgba(255,255,255,0) 45%),

    radial-gradient(circle at 50% 10%,
      rgba(242,181,68,.18) 0%,
      transparent 38rem),

    linear-gradient(
      145deg,
      #2a2a2a 0%,
      #1b1b1b 40%,
      #111111 100%
    );

  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.page {
  width: min(920px, 100%);
  text-align: center;
}


.card::before {
  content: "";

  position: absolute;

  top: 40px;
  left: 50%;

  width: 380px;
  height: 180px;

  transform: translateX(-50%);

  background:
    radial-gradient(
      ellipse,
      rgba(255,255,255,.18) 0%,
      rgba(255,255,255,.05) 45%,
      transparent 75%
    );

  pointer-events: none;
  z-index: 0;
}

.logo {
  width: min(320px, 75vw);
  height: auto;
  margin-bottom: 28px;

  filter:
    drop-shadow(0 0 12px rgba(255,255,255,.18))
    drop-shadow(0 12px 30px rgba(0,0,0,.45));

  position: relative;
  z-index: 2;
}

h1 {
  margin: 0;
  font-size: clamp(2.1rem, 7vw, 4.8rem);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.subtitle {
  margin: 16px auto 0;
  max-width: 640px;
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  line-height: 1.6;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  padding: 8px 14px;
  border: 1px solid rgba(242, 181, 68, .35);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(242, 181, 68, .08);
  font-weight: 700;
  text-transform: uppercase;
  font-size: .8rem;
  letter-spacing: .12em;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 14px 20px;
  border-radius: 999px;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
  background: rgba(255, 255, 255, .05);
  font-weight: 700;
}

.btn:hover,
.btn:focus {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: rgba(242, 181, 68, .10);
}

.footer {
  margin-top: 24px;
  color: #8d8d8d;
  font-size: .9rem;
}

.error-code {
  color: var(--accent);
  font-weight: 900;
  font-size: clamp(4rem, 18vw, 9rem);
  line-height: .9;
  margin: 0 0 16px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.social-link img {
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
}

.campaign-banner {
  width: 100%;
  margin: 24px 0;
  border-radius: 16px;
  overflow: hidden;

  background: linear-gradient(
  135deg,
  #3a3a3a 0%,
  #2a2a2a 45%,
  #c20000 100%
);

  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.campaign-content {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 22px;
}

.campaign-icon {
  width: 56px;
  height: 56px;

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 28px;

  background: rgba(255,255,255,.08);
  border-radius: 12px;
}

.campaign-text {
  flex: 1;
  text-align: left;
}

.campaign-label {
  display: block;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #ff4d4d;
  margin-bottom: 4px;
}

.campaign-text strong {
  color: #fff;
  font-size: 15px;
  line-height: 1.4;
}

.campaign-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: 12px 18px;

  background: #fff;
  color: #111;
  text-decoration: none;
  font-weight: 700;

  border-radius: 10px;

  transition: all .2s ease;
}

.campaign-btn:hover {
  transform: translateY(-2px);
  background: #f5f5f5;
}

@media (max-width: 768px) {
  .campaign-content {
    flex-direction: column;
    text-align: center;
  }

  .campaign-text {
    text-align: center;
  }

  .campaign-btn {
    width: 100%;
  }
}