body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #0D0D0D;
    color: #FFFFFF;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid #333;
    margin-bottom: 40px;
    position: relative;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    margin-right: 15px;
}

.app-name {
    font-size: 24px;
    font-weight: 700;
    color: #FFFFFF;
    flex: 1;
}

.language-selector {
    margin-left: auto;
}

.language-selector select {
    background-color: #1C1C1E;
    color: #FFFFFF;
    border: 1px solid #3A3A3C;
    border-radius: 10px;
    padding: 8px 12px;
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.language-selector select:hover {
    border-color: #FFD700;
}

.language-selector select:focus {
    border-color: #FFD700;
}

h1 {
    color: #FFD700;
    font-size: 32px;
    margin-bottom: 30px;
}

h2 {
    color: #FFD700;
    font-size: 24px;
    margin-top: 40px;
    margin-bottom: 15px;
}

h3 {
    color: #FFFFFF;
    font-size: 18px;
    margin-top: 30px;
    margin-bottom: 10px;
}

p, li {
    color: #9CA3AF;
    font-size: 16px;
    margin-bottom: 15px;
}

a {
    color: #FFD700;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.contact-form {
    background-color: #1C1C1E;
    padding: 30px;
    border-radius: 20px;
    margin-top: 20px;
}

.form-group {
    margin-bottom: 20px;
}

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

input, textarea {
    width: 100%;
    padding: 12px;
    background-color: #2C2C2E;
    border: 1px solid #3A3A3C;
    border-radius: 10px;
    color: #FFFFFF;
    font-size: 16px;
    box-sizing: border-box;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #FFD700;
}

button {
    background-color: #FFD700;
    color: #0D0D0D;
    border: none;
    padding: 16px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    width: 100%;
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.9;
}

/* iPhone Optimization */
@media (max-width: 600px) {
    .container {
        padding: 16px;
    }

    header {
        margin-bottom: 24px;
        flex-wrap: wrap;
    }

    .app-name {
        font-size: 20px;
    }

    .language-selector {
        margin-left: auto;
    }

    .language-selector select {
        font-size: 13px;
        padding: 6px 10px;
    }

    h1 {
        font-size: 28px;
    }

    .contact-form {
        padding: 20px;
    }
}