body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    height: 100vh;
    overflow: hidden;
    background: #05060a;
}

/* overlay escuro + blur */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(6px);
    background: rgba(0,0,0,0.55);
    animation: fadeIn 0.4s ease;
}

/* caixa modal */
.login-card {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.85);
    padding: 30px;
    border-radius: 14px;
    box-shadow: 0 12px 48px rgba(0,0,0,0.6);
    width: 90%;
    max-width: 420px;
    animation: slideUp 0.4s ease;
}

.close-btn {
    position: absolute;
    top: 12px;
    right: 15px;
    font-size: 26px;
    cursor: pointer;
    color: #aaa;
}
.close-btn:hover {
    color: #fff;
}

.login-card h1 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 24px;
    text-align: center;
    color: #fff;
}

.login-card h2 {
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 16px;
    text-align: center;
    color: #ccc;
    font-weight: 400;
}

.login-card label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: #ddd;
}

.login-card input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid #333;
    background: #111;
    color: #fff;
    margin-bottom: 15px;
    font-size: 16px;
    box-sizing: border-box;
}

.login-card button {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    border: none;
    background: #1f7cff;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    font-size: 16px;
}

.login-card button:hover {
    background: #1660c4;
}

.alert {
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 15px;
}

.alert-info {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.18);
    color: #ddd;
}

.alert-error {
    background: rgba(255,0,0,0.12);
    border: 1px solid rgba(255,0,0,0.4);
    color: #ffb3b3;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translate(-50%, -40%); opacity: 0; }
    to { transform: translate(-50%, -50%); opacity: 1; }
}

/* MOBILE FIXES */
@media (max-width: 480px) {
    .login-card {
        width: 92%;
        padding: 22px;
    }

    .login-card input,
    .login-card button {
        font-size: 15px;
        padding: 11px 12px;
    }
}