* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    background: #e6f2ff;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 450px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    color: #1e5799;
}

    .header h1 {
        font-size: 32px;
        margin-bottom: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

        .header h1 i {
            margin-right: 15px;
        }

    .header p {
        font-size: 16px;
        opacity: 0.9;
    }

.card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    padding: 40px;
    transition: transform 0.3s ease;
    border: 1px solid #cce0ff;
}

    .card:hover {
        transform: translateY(-5px);
    }

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border 0.3s, box-shadow 0.3s;
}

    input:focus {
        border-color: #4d94ff;
        outline: none;
        box-shadow: 0 0 0 3px rgba(77, 148, 255, 0.2);
    }

.captcha-container {
    display: flex;
    gap: 10px;
    align-items: center;
}

.captcha-code {
    flex: 1;
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    padding: 10px;
    font-family: 'Courier New', monospace;
    font-size: 20px;
    font-weight: bold;
    letter-spacing: 5px;
    text-align: center;
    color: #1e5799;
    user-select: none;
}

.refresh-captcha {
    background: none;
    border: none;
    color: #4d94ff;
    font-size: 20px;
    cursor: pointer;
    padding: 5px;
}

    .refresh-captcha:hover {
        color: #1e5799;
    }

button {
    background: #4d94ff;
    color: white;
    border: none;
    padding: 15px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
    width: 100%;
}

    button:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(77, 148, 255, 0.4);
    }

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert i {
    margin-right: 10px;
    font-size: 18px;
}

.navigation {
    text-align: center;
    margin-top: 25px;
}

    .navigation a {
        color: #1e5799;
        text-decoration: none;
        margin: 0 10px;
        transition: opacity 0.3s;
        display: block;
        margin-bottom: 10px;
        font-weight: 500;
    }

        .navigation a:hover {
            opacity: 0.8;
            text-decoration: underline;
        }