:root {
    --primary-color: #6C63FF; /* Violet/Purple-ish */
    --secondary-color: #03dac6; /* Teal */
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --text-color: #E0E0E0;
    --subtext-color: #A0A0A0;
    --error-color: #CF6679;
}

body {
    margin: 0;
    font-family: 'Inter', 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--surface-color);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.5);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--primary-color);
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 1rem;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--primary-color);
}

main {
    padding: 2rem;
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

h1, h2, h3 {
    color: var(--primary-color);
}

p {
    color: var(--subtext-color);
}

.card {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    margin-bottom: 2rem;
    backdrop-filter: blur(10px); /* Glassmorphism hint */
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.2s, background-color 0.2s;
    border: none;
    cursor: pointer;
    text-align: center;
    margin: 0.5rem 0;
}

.btn:hover {
    background-color: #5a52d5;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: rgba(108, 99, 255, 0.1);
}

footer {
    background-color: var(--surface-color);
    text-align: center;
    padding: 1rem;
    margin-top: auto;
    color: var(--subtext-color);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    main {
        padding: 1rem;
    }
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    nav {
        margin-top: 1rem;
    }
    nav a {
        margin-left: 0;
        margin-right: 1rem;
    }
}