src/app/not-found.css

/* not-found.css — 404 page styles, Learnix design system */

/* ── Wrapper ── */
.nf-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  padding: 2rem 1rem;
  position: relative;
  overflow: hidden;
}

/* ── Floating background blobs ── */
.nf-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  opacity: 0.18;
  pointer-events: none;
  animation: nf-float 7s ease-in-out infinite;
}

.nf-blob-1 {
  width: 380px;
  height: 380px;
  background: #3b82f6;
  top: -80px;
  left: -100px;
  animation-delay: 0s;
}

.nf-blob-2 {
  width: 300px;
  height: 300px;
  background: #7c3aed;
  bottom: -60px;
  right: -80px;
  animation-delay: 2.5s;
}

.nf-blob-3 {
  width: 220px;
  height: 220px;
  background: #3b82f6;
  bottom: 30px;
  left: 20%;
  animation-delay: 4.5s;
  opacity: 0.1;
}

@keyframes nf-float {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-18px) scale(1.04); }
}

/* ── Card ── */
.nf-card {
  position: relative;
  z-index: 1;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 24px;
  padding: 3rem 2.5rem 2.5rem;
  max-width: 480px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.07);
  animation: nf-card-in 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes nf-card-in {
  from { opacity: 0; transform: translateY(32px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}

/* ── 404 Number ── */
.nf-code-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  user-select: none;
}

.nf-digit {
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
}

.nf-digit-4a {
  color: #3b82f6;
  animation: nf-digit-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s both;
}

.nf-digit-4b {
  color: #3b82f6;
  animation: nf-digit-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.3s both;
}

@keyframes nf-digit-in {
  from { opacity: 0; transform: scale(0.5) rotate(-10deg); }
  to   { opacity: 1; transform: scale(1)   rotate(0deg); }
}

.nf-zero-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: nf-digit-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s both;
}

.nf-zero-ring {
  position: absolute;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: 3px solid #bfdbfe;
  background: #eff6ff;
  animation: nf-ring-pulse 2.5s ease-in-out infinite;
}

@keyframes nf-ring-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.2); }
  50%       { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); }
}

.nf-digit-0 {
  color: #1f2937;
  position: relative;
  z-index: 1;
}

/* ── Search icon ── */
.nf-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border: 2px solid #bfdbfe;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  animation: nf-card-in 0.5s ease 0.25s both;
}

.nf-icon {
  width: 26px;
  height: 26px;
  color: #3b82f6;
}

/* ── Text ── */
.nf-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: #1f2937;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.nf-desc {
  font-size: 0.93rem;
  color: #6b7280;
  line-height: 1.65;
  margin: 0 0 2rem;
}

/* ── Action buttons ── */
.nf-actions {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.nf-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.4rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.nf-btn:active {
  transform: scale(0.97);
}

.nf-btn-primary {
  background: #3b82f6;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.nf-btn-primary:hover {
  background: #2563eb;
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
  transform: translateY(-1px);
}

.nf-btn-secondary {
  background: #f3f4f6;
  color: #374151;
  border: 1px solid #e5e7eb;
}

.nf-btn-secondary:hover {
  background: #e5e7eb;
  transform: translateY(-1px);
}

/* ── Hint ── */
.nf-hint {
  font-size: 0.78rem;
  color: #9ca3af;
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid #f1f5f9;
}

.nf-hint-code {
  font-family: monospace;
  color: #3b82f6;
  font-weight: 600;
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .nf-card {
    padding: 2.25rem 1.5rem 2rem;
  }

  .nf-digit {
    font-size: 4.5rem;
  }

  .nf-zero-ring {
    width: 64px;
    height: 64px;
  }

  .nf-title {
    font-size: 1.35rem;
  }

  .nf-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .nf-btn {
    justify-content: center;
  }
}