/* Header Styles */
header {
    background-color: var(--parchment-dark);
    background-image: var(--parchment-texture);
    color: var(--ink);
    padding: 1.5rem 1rem;
    text-align: center;
    border-bottom: var(--border-style);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(42, 37, 34, 0.1);
}

header::before {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 10px;
    background-image: var(--edge-decoration);
    z-index: 1;
}

nav {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* Main Content Area */
main {
    flex: 1;
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
    width: 100%;
    position: relative;
}

main::before {
    content: "";
    position: absolute;
    top: -10px;
    left: 10%;
    right: 10%;
    height: 1px;
    background-color: var(--ink-light);
    opacity: 0.15;
}

/* Category Selector */
.category-selector {
    margin-bottom: 2rem;
    text-align: center;
    padding: 0.5rem;
    position: relative;
}

.category-selector label {
    display: block;
    margin-bottom: 0.75rem;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--ink-faded);
}

/* Mode containers */
.mode-container {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-standard), transform var(--transition-standard);
    transform: translateY(20px);
}

.mode-container.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* Footer */
footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    color: var(--ink-faded);
    background-color: var(--parchment-dark);
    background-image: var(--parchment-texture);
    border-top: var(--border-style);
    font-family: var(--font-serif);
    position: relative;
}

footer::before {
    content: "";
    position: absolute;
    top: -10px;
    left: 0;
    right: 0;
    height: 10px;
    background-image: var(--edge-decoration);
    z-index: 1;
}

footer p {
    position: relative;
    display: inline-block;
}

footer p::before,
footer p::after {
    content: "~";
    display: inline-block;
    margin: 0 10px;
    opacity: 0.7;
}