:root {
    --bg-dark: #0a0a0a;
    --accent-color: #6366f1;
}
body {
    font-family: "Inter", sans-serif;
    background-color: var(--bg-dark);
    color: #d1d5db;
}
.main-container {
    min-height: 100vh;
}
.tab-button {
    transition: all 0.2s ease-in-out;
    border-bottom: 3px solid transparent;
    font-weight: 500;
    padding: 0.5rem 1rem;
    cursor: pointer;
    color: #9ca3af;
}
.tab-button.active {
    color: #ffffff;
    border-color: var(--accent-color);
    background-color: rgba(99, 102, 241, 0.1);
}
.tab-button:hover:not(.active) {
    color: #e5e7eb;
    background-color: rgba(99, 102, 241, 0.05);
}
.card {
    border: 1px solid #1f2937; /* Darker border */
    background-color: #111827; /* Dark card background */
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -2px rgba(0, 0, 0, 0.06);
    /* Apply transition directly to the content-area for fade-in effect */
    transition:
        opacity 0.1s ease-in-out,
        transform 0.1s ease-in-out;
}
.section-title {
    color: var(--accent-color);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-weight: 700;
}
/* The following keyframes are no longer strictly needed but kept as fallback for now.
   The JS now uses inline styles to trigger the 'card' transition. */
/* @keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
*/