:root {
    --bg-color: #0f0f0f;
    --second-bg-color: #1a1a1a;
    --text-color: #ffffff;
    --accent-color: #ff0000;
    --accent-gradient: linear-gradient(45deg, #ff0000, #ff8888);
    --input-bg-color: #2a2a2a;
    --border-color: #333333;
    --invalid-color: #ff0000;
    --valid-color: #00ff00;
}

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

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.header {
    background-color: var(--second-bg-color);
    backdrop-filter: blur(20px);
    padding: 0.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

body, html {
    font-family: 'Poppins', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}