* {
        box-sizing: border-box;
    }

    html {
        height: -webkit-fill-available;
        background-color: #0f172a; /* Fallback to mask empty spaces */
    }

    html, body {
        margin: 0 !important;
        padding: 0 !important;
        width: 100%;
        min-height: 100vh;
        min-height: -webkit-fill-available;
        overflow-x: hidden;
    }

    body {
        font-family: 'Inter', 'Segoe UI', sans-serif;
        background: linear-gradient(-45deg, #0f172a, #1e293b, #3b82f6, #0ea5e9);
        background-size: 400% 400%;
        background-attachment: fixed; /* Crucial for mobile */
        animation: gradientBG 15s ease infinite;
        display: flex;
        justify-content: center;
        align-items: center;
        box-sizing: border-box;
    }

    @keyframes gradientBG {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .glass-login-container {
        background: rgba(255, 255, 255, 0.05);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 24px;
        padding: 50px 60px;
        width: 100%;
        max-width: 520px;
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        position: relative;
        z-index: 10;
        transform: translateY(30px);
        opacity: 0;
        animation: slideUpFade 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    }

    @keyframes slideUpFade {
        to { transform: translateY(0); opacity: 1; }
    }

    .glass-login-container h3 {
        color: #fff;
        font-weight: 700;
        font-size: 36px;
        margin-bottom: 12px;
        text-align: center;
        letter-spacing: 0.5px;
    }
    
    .glass-login-container p.subtitle {
        color: #94a3b8;
        text-align: center;
        margin-bottom: 35px;
        font-size: 14px;
    }

    .premium-input-group {
        position: relative;
        margin-bottom: 25px;
    }

    .premium-input-group input {
        width: 100%;
        padding: 18px 22px;
        background: rgba(15, 23, 42, 0.4);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 12px;
        color: #fff;
        font-size: 16px;
        transition: all 0.3s ease;
        outline: none;
    }

    .premium-input-group input:focus {
        border-color: #1e3a8a;
        background: rgba(15, 23, 42, 0.6);
        box-shadow: 0 0 0 4px rgba(30, 58, 138, 0.15);
    }

    .premium-input-group label {
        position: absolute;
        top: 50%;
        left: 20px;
        transform: translateY(-50%);
        color: #64748b;
        font-size: 15px;
        pointer-events: none;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .premium-input-group input:focus ~ label,
    .premium-input-group input:not(:placeholder-shown) ~ label {
        top: -10px;
        left: 15px;
        font-size: 12px;
        color: #60a5fa;
        border-radius: 4px;
        border: 1px solid rgba(255,255,255,0.05);
    }

    .toggle-pwd {
        position: absolute;
        top: 50%;
        right: 15px;
        transform: translateY(-50%);
        color: #94a3b8;
        cursor: pointer;
        transition: color 0.3s, transform 0.2s;
    }
    .toggle-pwd:hover { color: #fff; transform: translateY(-50%) scale(1.1); }

    .btn-premium-login {
        width: 100%;
        padding: 18px;
        background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
        color: #fff;
        border: none;
        border-radius: 12px;
        font-size: 17px;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
        margin-top: 20px;
        box-shadow: 0 4px 15px rgba(30, 58, 138, 0.3);
    }

    .btn-premium-login:hover {
        transform: translateY(-3px);
        box-shadow: 0 10px 25px rgba(30, 58, 138, 0.5);
    }

    .btn-premium-login::after {
        content: '';
        position: absolute;
        top: 0; left: -100%;
        width: 50%; height: 100%;
        background: linear-gradient(to right, rgba(255,255,255,0), rgba(255,255,255,0.4), rgba(255,255,255,0));
        transform: skewX(-25deg);
        animation: loginShimmer 3s infinite;
    }

    @keyframes loginShimmer {
        0% { left: -100%; } 20% { left: 200%; } 100% { left: 200%; }
    }

    .auth-footer {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 20px;
        font-size: 14px;
    }

    .auth-footer a {
        color: #60a5fa;
        text-decoration: none;
        transition: color 0.3s;
    }
    .auth-footer a:hover { color: #93c5fd; text-decoration: underline; }

    .form-check {
        display: flex;
        align-items: center;
        gap: 8px;
        color: #cbd5e1;
    }
    
    .text-danger {
        color: #ff8787;
        font-size: 13px;
        margin-top: 5px;
        display: block;
        padding-left: 5px;
        background: rgba(239, 68, 68, 0.1);
        border-radius: 4px;
        border-left: 3px solid #ef4444;
    }

    /* Floating Particles Background */
    .particles {
        position: fixed; /* Ensures it never leaves the viewport */
        top: 0; left: 0; width: 100%; height: 100%;
        z-index: 1; pointer-events: none;
    }
    .particle {
        position: absolute;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
        animation: floatUp infinite linear;
        filter: blur(1px);
    }
    @keyframes floatUp {
        0% { transform: translateY(100vh) scale(0); opacity: 0; }
        10% { opacity: 0.6; }
        90% { opacity: 0.6; }
        100% { transform: translateY(-100px) scale(1.5); opacity: 0; }
    }
    
    /* Responsive */
    @media (max-width: 576px) {
        .glass-login-container {
            padding: 30px 20px;
            width: 90%;
            border-radius: 20px;
        }
    }

    /* Desktop Monitors Specific Tweaks */
    @media (min-width: 992px) {
        .glass-login-container {
            max-width: 460px;
            padding: 45px 55px;
            border-radius: 26px;
        }
        .glass-login-container h3 {
            font-size: 34px;
            margin-bottom: 12px;
        }
        .glass-login-container p.subtitle {
            font-size: 15px;
            margin-bottom: 35px;
        }
        .premium-input-group {
            margin-bottom: 25px;
        }
        .premium-input-group input {
            padding: 17px 22px;
            font-size: 16px;
            border-radius: 12px;
        }
        .premium-input-group label {
            left: 22px;
            font-size: 15px;
        }
        .premium-input-group input:focus ~ label,
        .premium-input-group input:not(:placeholder-shown) ~ label {
            top: -12px;
            left: 15px;
            font-size: 13px;
            padding: 2px 8px;
        }
        .premium-input-group i {
            font-size: 22px !important;
            right: 18px !important;
        }
        .btn-premium-login {
            padding: 18px;
            font-size: 18px;
            margin-top: 25px;
            border-radius: 12px;
        }
        .auth-footer {
            font-size: 14px;
            margin-top: 20px;
        }
        .form-check input {
            width: 18px !important;
            height: 18px !important;
        }
    }