/* ===============================
   GLOBAL
================================= */

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: linear-gradient(135deg, #c4161c, #7a0f12);
    min-height: 100vh; /* safer than height */
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-y: auto; /* prevents mobile keyboard issue */
}

/* ===============================
   LOGIN BOX
================================= */

.login-box {
    background: #ffffff;
    padding: 45px 40px;
    width: 100%;
    max-width: 420px; /* desktop control */
    border-radius: 16px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    text-align: center;
    animation: fadeIn 0.4s ease-in-out;
}

    .login-box h2 {
        margin-bottom: 30px;
        color: #c4161c;
        font-weight: 700;
        font-size: 22px;
    }

/* ===============================
   INPUT FIELDS
================================= */

.input {
    width: 100%;
    padding: 14px 16px;
    margin-bottom: 18px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 14px;
    transition: 0.25s ease;
}

    .input:focus {
        outline: none;
        border-color: #c4161c;
        box-shadow: 0 0 6px rgba(196,22,28,0.3);
    }

/* ===============================
   BUTTON
================================= */

.btn {
    width: 100%;
    padding: 14px;
    border-radius: 30px;
    border: none;
    background: linear-gradient(135deg, #c4161c, #9f1015);
    color: #ffffff;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.25s ease;
}

    .btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(196,22,28,0.4);
    }

/* ===============================
   ERROR MESSAGE
================================= */

.error {
    display: block;
    margin-top: 12px;
    font-size: 13px;
    color: #dc3545;
    font-weight: 600;
}

/* ===============================
   TABLET RESPONSIVE
================================= */

@media (max-width: 768px) {

    .login-box {
        padding: 35px 30px;
        max-width: 380px;
    }

        .login-box h2 {
            font-size: 20px;
        }

    .input {
        padding: 13px 14px;
    }

    .btn {
        padding: 13px;
    }
}

/* ===============================
   MOBILE RESPONSIVE
================================= */

@media (max-width: 480px) {

    body {
        padding: 15px;
        align-items: flex-start; /* better when keyboard opens */
    }

    .login-box {
        padding: 28px 20px;
        border-radius: 12px;
    }

        .login-box h2 {
            font-size: 18px;
            margin-bottom: 20px;
        }

    .input {
        padding: 12px;
        font-size: 14px;
    }

    .btn {
        padding: 12px;
        font-size: 14px;
    }
}

/* ===============================
   ANIMATION
================================= */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

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