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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #0a0a0a;
    color: #fff;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Login Container */
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

/* Login Card */
.login-card {
    background: #111;
    border: 1px solid #222;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.login-card h1 {
    color: #fff;
    font-size: 28px;
    font-weight: 600;
    margin: 0;
    margin-bottom: 8px;
}

.login-card p {
    color: #999;
    margin: 0;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px;
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 8px;
    color: #fff;
    font-size: 14px;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus {
    outline: none;
    border-color: #555;
}

.form-group input[type="text"]::placeholder,
.form-group input[type="password"]::placeholder {
    color: #666;
}

/* Checkbox */
.form-group input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    margin: 0;
    accent-color: #667eea;
}

/* Login Button */
.login-btn {
    width: 100%;
    padding: 14px;
    background: #fff;
    color: #000;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.login-btn:hover:not(:disabled) {
    background: #e0e0e0;
    transform: translateY(-1px);
}

.login-btn:active:not(:disabled) {
    transform: translateY(0);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Error Message */
#error-message {
    color: #ff4444;
    margin-top: 16px;
    display: none;
    font-size: 14px;
    text-align: center;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* Responsive */
@media (max-width: 480px) {
    .login-container {
        padding: 16px;
    }

    .login-card {
        padding: 32px 24px;
    }

    .login-card h1 {
        font-size: 24px;
    }

    .form-group input[type="text"],
    .form-group input[type="password"] {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}