/*
  404 Page — Misty Forest Theme
  - Mobile‑first, responsive, accessible
  - Uses CSS variables for easy theming
*/

:root {
  --bg: #0b1220;
  --fg: #e6ecff;
  --muted: #c6d0f5cc;
  --accent: #8aa0ff;
  --overlay: 0.55;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Poppins', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Apple Color Emoji', 'Segoe UI Emoji';
  color: var(--fg);
  background: var(--bg);
}

/* Top bar */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 20px;
  z-index: 3;
  background: linear-gradient(180deg, rgba(11,18,32,0.65), rgba(11,18,32,0));
  backdrop-filter: blur(4px);
}
.icon-btn {
  height: 40px;
  width: 40px;
  display: grid;
  place-items: center;
  color: var(--fg);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 10px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}
.icon-btn:hover { transform: translateY(-1px); border-color: rgba(255,255,255,0.4); }
.icon-btn:active { transform: translateY(0); }
.logo { font-weight: 800; letter-spacing: 1px; }
.logo span { opacity: 0.85; font-weight: 600; }

/* Hero section */
.hero {
  position: relative;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  text-align: center;
  isolation: isolate;
  overflow: hidden;
}

/* Foggy forest background using gradient + image overlay */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: radial-gradient(1200px 600px at 50% 0%, #1a2236 0%, var(--bg) 60% 100%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: url('https://wallpapercat.com/w/full/6/2/a/2117716-3840x2160-desktop-4k-dark-wallpaper-photo.jpg') center/cover no-repeat;
  filter: grayscale(10%) saturate(80%) contrast(105%) brightness(85%);
  opacity: var(--overlay);
  transform: scale(1.03);
}

.center { padding: 96px 20px 40px; }
.code {
  margin: 0 0 8px;
  font-weight: 800;
  font-size: clamp(96px, 20vw, 240px);
  line-height: 0.85;
  letter-spacing: 5px;
  color: #ffffff;
  opacity: 0.6;
}
.title {
  margin: 8px 0 8px;
  font-size: clamp(22px, 4vw, 40px);
  font-weight: 700;
}
.subtitle {
  margin: 0 0 28px;
  font-size: clamp(13px, 2.6vw, 16px);
  color: var(--muted);
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.35);
  color: var(--fg);
  text-decoration: none;
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(6px);
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease, color 140ms ease;
}
.btn:hover { transform: translateY(-1px); background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.55); }
.btn:active { transform: translateY(0); }

/* Small helper for reduced motion */
@media (prefers-reduced-motion: reduce) {
  .icon-btn, .btn { transition: none; }
  .hero::after { transform: none; }
}