/* ================= Navigation Bar ================= */
nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    padding: 20px;
    width: 90%;
    max-width: 900px;
    margin-top: 1rem;
    position: relative;
    z-index: 10; 
}

nav button,
nav a.nav-btn {
    background-color: var(--color-purple);
    color: var(--color-white);
    font-family: var(--font-main);
    font-weight: 600;
    border: none;
    border-radius: 100px; 
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px; 
    transition: transform 0.15s var(--ease-hover), background-color 0.15s var(--ease-hover), box-shadow 0.15s var(--ease-hover);
    text-decoration: none;
    white-space: nowrap; 
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

nav button i { 
    font-size: 1.1rem; 
}

nav button:hover,
nav a.nav-btn:hover {
    background-color: var(--color-purple-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(107, 33, 168, 0.2);
}

nav button.active,
nav a.nav-btn.active {
    background-color: var(--color-yellow);
    color: var(--color-black);
    font-weight: 800;
    box-shadow: 0 4px 10px rgba(234, 179, 8, 0.3);
}

.button-pair {
    display: inline-flex;
    border-radius: 100px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.button-pair button {
    border-radius: 0;
    box-shadow: none; 
}

.button-pair button:hover {
    transform: none; 
    background-color: var(--color-purple-dark);
}

.button-pair button:first-child { 
    border-right: 2px solid rgba(255, 255, 255, 0.2); 
}

@media (max-width: 600px) {
    nav { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; max-width: 400px; }
    nav button, nav a.nav-btn { width: 100%; justify-content: center; }
    .button-pair { flex-direction: column; border-radius: 16px; }
    .button-pair button:first-child { border-right: none; border-bottom: 2px solid rgba(255, 255, 255, 0.2); }
}