:root {
        --primary-color: #4f46e5;
        --primary-hover: #4338ca;
        --bg-color: #eef2ff;
        --text-color: #1f2937;
        --text-muted: #6b7280;
        --white: #ffffff;
        --success-color: #10b981;
    }

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    }

    body {
        background: linear-gradient(135deg, #e0e7ff, #f3f4f6);
        display: flex;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        padding: 20px;
    }

    /* CARD BOX */
    .login-card {
        width: 100%;
        max-width: 420px;
        background: var(--white);
        border-radius: 22px;
        overflow: hidden;
        box-shadow: 0 15px 40px rgba(0,0,0,0.12);
        animation: fadeIn 0.5s ease;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* SLIDER */
    .slider {
        position: relative;
        width: 100%;
        height: 260px;
        overflow: hidden;
    }

    .slides {
        display: flex;
        width: 300%;
        height: 100%;
        animation: slide 12s infinite;
    }

    .slides img {
        width: 100%;
        height: 260px;
        object-fit: cover;
    }

    @keyframes slide {
        0% { transform: translateX(0); }
        25% { transform: translateX(0); }

        33% { transform: translateX(-33.333%); }
        58% { transform: translateX(-33.333%); }

        66% { transform: translateX(-66.666%); }
        91% { transform: translateX(-66.666%); }

        100% { transform: translateX(0); }
    }

    .content {
        padding: 30px 25px;
        text-align: center;
    }

    .content h1 {
        font-size: 1.9rem;
        color: var(--text-color);
        margin-bottom: 10px;
    }

    .content p {
        color: var(--text-muted);
        font-size: 0.95rem;
        margin-bottom: 25px;
    }

    .php-message {
        padding: 12px;
        border-radius: 8px;
        margin-bottom: 20px;
        background: #d1fae5;
        color: #047857;
        font-size: 0.92rem;
    }

    /* GOOGLE BUTTON */
    .btn-google {
        width: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 12px;
        padding: 14px;
        border-radius: 12px;
        text-decoration: none;
        background: var(--primary-color);
        color: white;
        font-size: 1rem;
        font-weight: 600;
        transition: 0.3s ease;
        box-shadow: 0 5px 15px rgba(79,70,229,0.3);
    }

    .btn-google:hover {
        background: var(--primary-hover);
        transform: translateY(-2px);
    }

    .btn-google img {
        background: white;
        border-radius: 50%;
        padding: 2px;
    }

    /* TOAST */
    .toast {
        position: fixed;
        top: 20px;
        right: 20px;
        background: var(--success-color);
        color: white;
        padding: 14px 20px;
        border-radius: 8px;
        opacity: 0;
        transform: translateY(-100px);
        transition: 0.4s;
        z-index: 1000;
    }

    .toast.show {
        opacity: 1;
        transform: translateY(0);
    }

    @media (max-width: 500px) {
        .slider {
            height: 220px;
        }

        .slides img {
            height: 220px;
        }

        .content {
            padding: 25px 18px;
        }

        .content h1 {
            font-size: 1.6rem;
        }
    }