:root {
    --primary-color: #0071e3;
    --text-color: #1d1d1f;
    --secondary-text: #86868b;
    --background-color: #ffffff;
    --secondary-bg: #f5f5f7;
    --border-color: #d2d2d7;
    --success-color: #4cd964;
    --error-color: #ff3b30;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    margin-bottom: 60px;
    text-align: center;
}

.logo h1 {
    font-size: 36px;
    font-weight: 500;
    letter-spacing: -0.5px;
}

.hero {
    text-align: center;
    margin-bottom: 50px;
}

.hero h2 {
    font-size: 32px;
    font-weight: 500;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 17px;
    color: var(--secondary-text);
    max-width: 600px;
    margin: 0 auto;
}

.contact-form {
    background-color: var(--secondary-bg);
    border-radius: 18px;
    padding: 40px;
    margin-bottom: 50px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: 24px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-size: 15px;
    font-weight: 500;
}

input, textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--background-color);
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 113, 227, 0.2);
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.submit-btn:hover {
    background-color: #0062c3;
}

.submit-btn:active {
    background-color: #004e9e;
}

.response-message {
    margin-top: 24px;
    padding: 16px;
    border-radius: 10px;
    font-size: 15px;
    display: none;
}

.response-message.success {
    background-color: rgba(76, 217, 100, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(76, 217, 100, 0.2);
    display: block;
}

.response-message.error {
    background-color: rgba(255, 59, 48, 0.1);
    color: var(--error-color);
    border: 1px solid rgba(255, 59, 48, 0.2);
    display: block;
}

footer {
    text-align: center;
    color: var(--secondary-text);
    font-size: 14px;
}

@media (max-width: 768px) {
    .container {
        padding: 30px 15px;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #f5f5f7;
        --secondary-text: #a1a1a6;
        --background-color: #1d1d1f;
        --secondary-bg: #2c2c2e;
        --border-color: #424245;
    }
}