* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #0a0a0f;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
  position: relative;
}

/* ── animated background canvas ── */
#bg-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ── gate box ── */
.gate-box {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 48px 40px;
  border-radius: 20px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    0 0 80px rgba(59, 130, 246, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  animation: fadeUp 0.6s ease-out;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── icon ── */
.gate-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.gate-box h2 {
  margin-bottom: 8px;
  font-size: 22px;
  font-weight: 700;
  color: #f1f5f9;
  letter-spacing: -0.3px;
}

.gate-box p {
  margin-bottom: 28px;
  font-size: 14px;
  color: #64748b;
  line-height: 1.5;
}

/* ── input ── */
.gate-box input[type="password"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  outline: none;
  transition: all 0.25s ease;
}

.gate-box input[type="password"]::placeholder {
  color: #475569;
}

.gate-box input[type="password"]:focus {
  border-color: #3b82f6;
  background: rgba(59, 130, 246, 0.06);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ── button ── */
.gate-box button {
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: 0.3px;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.gate-box button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.4);
  background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
}

.gate-box button:active {
  transform: translateY(0);
}

/* ── error ── */
.error-msg {
  margin-top: 16px;
  padding: 10px 14px;
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.15);
  border-radius: 10px;
  font-size: 13px;
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%      { transform: translateX(-6px); }
  75%      { transform: translateX(6px); }
}

/* ── responsive ── */
@media (max-width: 480px) {
  .gate-box { margin: 16px; padding: 36px 28px; }
}