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

:root {
  --bg: #0a0a0f;
  --card: #12121a;
  --card-border: #1e1e2e;
  --input-bg: #0e0e16;
  --input-border: #2a2a3a;
  --input-focus: #6366f1;
  --text: #e4e4e7;
  --text-dim: #71717a;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --error: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Animated grid background */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridMove 20s linear infinite;
  z-index: 0;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(60px, 60px); }
}

.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  padding: 20px;
}

.login-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 48px 40px 36px;
  box-shadow:
    0 0 0 1px rgba(99, 102, 241, 0.05),
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 120px rgba(99, 102, 241, 0.04);
  backdrop-filter: blur(20px);
}

/* Logo */
.logo-section {
  text-align: center;
  margin-bottom: 36px;
}

.logo-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.logo-section h1 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #e4e4e7, #a1a1aa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 4px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* Error */
.error-msg {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--error-bg);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--error);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 24px;
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* Form */
form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  padding-left: 2px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-dim);
  pointer-events: none;
  transition: color 0.2s;
}

.input-wrapper input {
  width: 100%;
  padding: 13px 14px 13px 44px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper input::placeholder {
  color: #3f3f50;
}

.input-wrapper input:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.input-wrapper input:focus ~ .input-icon,
.input-wrapper:focus-within .input-icon {
  color: var(--accent);
}

/* Password toggle */
.toggle-pw {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  display: flex;
  transition: color 0.2s;
}

.toggle-pw:hover {
  color: var(--text);
}

/* Button */
.btn-login {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  margin-top: 8px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.btn-login::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1));
  opacity: 0;
  transition: opacity 0.2s;
}

.btn-login:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.btn-login:hover::before {
  opacity: 1;
}

.btn-login:active {
  transform: translateY(0);
}

/* Footer */
.footer-text {
  text-align: center;
  margin-top: 28px;
  font-size: 11px;
  color: #3f3f50;
}

.version {
  color: var(--accent);
  opacity: 0.6;
}

/* Responsive */
@media (max-width: 480px) {
  .login-card {
    padding: 36px 24px 28px;
  }
}