:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --error-bg: #fee2e2;
    --error-text: #b91c1c;
    --input-bg: #f9fafb;
}

body {
    margin: 0;
    background: var(--bg-gradient);
    background-attachment: fixed;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px); /* Modern glass effect */
    padding: 3rem 2.5rem;
    border-radius: 24px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    width: 100%;
    max-width: 400px;
    transition: transform 0.3s ease;
}

.login-header h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: #111827;
    margin-bottom: 0.5rem;
}

/* Floating Input Label Style Effect */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

    .form-group input {
        width: 100%;
        padding: 0.8rem 1rem;
        background-color: var(--input-bg);
        border: 1px solid #e5e7eb;
        border-radius: 12px;
        font-size: 1rem;
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        box-sizing: border-box;
    }

        .form-group input:focus {
            background-color: #fff;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
            outline: none;
        }

/* Password Toggle Styling */
.password-wrapper {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: #9ca3af;
    font-size: 0.8rem;
    user-select: none;
    font-weight: 600;
}

/* Submit Button Animation */
.btn-submit {
    width: 100%;
    padding: 0.9rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.4);
}

    .btn-submit:hover {
        background: var(--primary-hover);
        transform: translateY(-1px);
        box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3);
    }

    .btn-submit:active {
        transform: translateY(1px);
    }

/* Shake animation for errors */
.shake {
    animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% {
        transform: translate3d(-1px, 0, 0);
    }

    20%, 80% {
        transform: translate3d(2px, 0, 0);
    }

    30%, 50%, 70% {
        transform: translate3d(-4px, 0, 0);
    }

    40%, 60% {
        transform: translate3d(4px, 0, 0);
    }
}