/* ==========================================================================
   Column Article Styles — prefix: ns-
   ========================================================================== */

/* --- Category Filter --- */

.ns-cat-filter {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-xl);
}

.ns-cat-filter__item {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    font-size: 0.8125rem;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    letter-spacing: 0.03em;
    transition: all 0.2s ease;
}

.ns-cat-filter__item:hover {
    border-color: var(--color-main);
    color: var(--color-main);
}

.ns-cat-filter__item--active {
    background-color: var(--color-main);
    border-color: var(--color-main);
    color: #fff;
}

.ns-cat-filter__item--active:hover {
    color: #fff;
}

/* --- TOC --- */

.ns-toc {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-xl);
}

.ns-toc__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: none;
    border: none;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    color: var(--color-text);
    padding: 0;
}

.ns-toc__toggle::after {
    content: '\25BC';
    font-size: 0.625rem;
    transition: transform 0.3s ease;
    color: var(--color-main);
}

.ns-toc__toggle[aria-expanded="false"]::after {
    transform: rotate(-90deg);
}

.ns-toc__nav {
    margin-top: var(--space-sm);
}

.ns-toc__nav.is-hidden {
    display: none;
}

.ns-toc__list {
    list-style: none;
}

.ns-toc__item {
    margin-bottom: 0.375rem;
}

.ns-toc__item > a {
    display: block;
    padding: 0.375rem 0;
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: color 0.2s ease;
}

.ns-toc__item > a:hover {
    color: var(--color-accent);
}

.ns-toc__sublist {
    list-style: none;
    padding-left: var(--space-lg);
    margin-top: 0.25rem;
}

.ns-toc__subitem a {
    display: block;
    padding: 0.25rem 0;
    font-size: 0.8125rem;
    color: var(--color-text-light);
}

.ns-toc__subitem a:hover {
    color: var(--color-accent);
}

/* --- Point Box --- */

.ns-point {
    border-left: 4px solid var(--color-main);
    background: var(--color-bg);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
}

.ns-point__label {
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-main);
    letter-spacing: 0.12em;
    margin-bottom: var(--space-xs);
}

.ns-point__body p {
    margin-bottom: var(--space-xs);
    font-size: 0.9375rem;
    line-height: 1.8;
}

.ns-point__body p:last-child {
    margin-bottom: 0;
}

.ns-point__body ul {
    list-style: none;
    padding-left: 0;
    margin: var(--space-xs) 0 0;
}

.ns-point__body ul li {
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

/* --- Caution Box --- */

.ns-caution {
    border-left: 4px solid #F59E0B;
    background: #FEF3C7;
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
}

.ns-caution__label {
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: #B45309;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-xs);
}

.ns-caution__body p {
    margin-bottom: var(--space-xs);
    font-size: 0.9375rem;
    line-height: 1.8;
    color: #78350F;
}

.ns-caution__body p:last-child {
    margin-bottom: 0;
}

/* --- Checklist --- */

.ns-checklist {
    background: var(--color-bg);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
}

.ns-checklist__title {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-sm);
}

.ns-checklist ul {
    list-style: none;
    padding: 0;
}

.ns-checklist ul li {
    position: relative;
    padding-left: 1.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
    line-height: 1.7;
}

.ns-checklist ul li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    top: 0.1em;
    color: var(--color-accent);
    font-weight: var(--font-weight-medium);
    font-size: 1rem;
}

/* --- Comparison Table --- */

.ns-table-wrap {
    overflow-x: auto;
    margin: var(--space-lg) 0;
    -webkit-overflow-scrolling: touch;
}

.ns-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 500px;
}

.ns-table thead th {
    background: var(--color-main);
    color: #fff;
    padding: 0.75rem var(--space-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    text-align: left;
    border: 1px solid #E5E7EB;
}

.ns-table tbody th {
    background: var(--color-bg);
    padding: 0.75rem var(--space-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    text-align: left;
    border: 1px solid #E5E7EB;
}

.ns-table tbody td {
    padding: 0.75rem var(--space-sm);
    font-size: 0.875rem;
    border: 1px solid #E5E7EB;
}

.ns-table tbody tr:nth-child(even) {
    background: rgba(250, 250, 249, 0.5);
}

/* --- FAQ --- */

.ns-faq {
    background: var(--color-bg);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
}

.ns-faq__item {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.ns-faq__item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.ns-faq__q {
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    line-height: 1.6;
    padding-left: 2.5rem;
    position: relative;
    margin-bottom: var(--space-sm);
}

.ns-faq__q::before {
    content: 'Q';
    position: absolute;
    left: 0;
    top: -0.1em;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--color-main);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
}

.ns-faq__a {
    font-size: 0.9375rem;
    line-height: 1.8;
    padding-left: 2.5rem;
    position: relative;
    color: var(--color-text-light);
}

.ns-faq__a::before {
    content: 'A';
    position: absolute;
    left: 0;
    top: -0.1em;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--color-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
}

/* --- Balloon --- */

.ns-balloon {
    display: flex;
    gap: var(--space-md);
    margin: var(--space-lg) 0;
    align-items: flex-start;
}

.ns-balloon--right {
    flex-direction: row-reverse;
}

.ns-balloon__icon {
    flex-shrink: 0;
}

.ns-balloon__icon img {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
}

.ns-balloon__body {
    position: relative;
    background: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    max-width: 80%;
}

.ns-balloon--left .ns-balloon__body::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 16px;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-right: 8px solid var(--color-bg);
}

.ns-balloon--right .ns-balloon__body::before {
    content: '';
    position: absolute;
    right: -8px;
    top: 16px;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 8px solid var(--color-bg);
}

.ns-balloon__name {
    font-size: 0.6875rem;
    color: var(--color-text-light);
    text-align: center;
    margin-top: 0.25rem;
}

.ns-balloon__text {
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* --- CTA --- */

.ns-cta {
    background: var(--color-main);
    padding: var(--space-xl);
    margin: var(--space-xl) 0;
    text-align: center;
}

.ns-cta__title {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    font-weight: var(--font-weight-medium);
    color: #fff;
    margin-bottom: var(--space-sm);
}

.ns-cta__text {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--space-lg);
}

.ns-cta__button {
    display: inline-block;
    padding: 0.875rem 2.5rem;
    background: var(--color-accent);
    color: #fff;
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.05em;
    transition: background-color 0.2s ease, opacity 0.2s ease;
}

.ns-cta__button:hover {
    background: var(--color-accent-hover);
    color: #fff;
    opacity: 0.9;
}

/* --- Persons (Author / Supervisor) --- */

.ns-persons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
    margin: var(--space-xl) 0;
}

.ns-persons__card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    padding: var(--space-lg);
}

.ns-persons__role {
    font-size: 0.6875rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-main);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
}

.ns-persons__inner {
    display: flex;
    gap: var(--space-md);
}

.ns-persons__photo {
    flex-shrink: 0;
}

.ns-persons__photo img {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover;
}

.ns-persons__name {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: 0.25rem;
}

.ns-persons__title {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

.ns-persons__profile {
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.ns-persons__quals {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: var(--space-sm);
}

.ns-persons__qual {
    display: inline-block;
    font-size: 0.6875rem;
    padding: 0.125rem 0.5rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text-light);
}

.ns-persons__links {
    display: flex;
    gap: var(--space-sm);
    font-size: 0.8125rem;
}

.ns-persons__links a {
    color: var(--color-accent);
}

.ns-persons__links a:hover {
    color: var(--color-accent-hover);
}

/* --- Responsive --- */

@media (max-width: 768px) {
    .ns-persons {
        grid-template-columns: 1fr;
    }

    .ns-persons__inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .ns-balloon__body {
        max-width: 100%;
    }

    .ns-cta {
        padding: var(--space-lg);
    }

    .ns-cta__title {
        font-size: 1.125rem;
    }
}

@media (max-width: 640px) {
    .ns-faq {
        padding: var(--space-md);
    }

    .ns-toc {
        padding: var(--space-sm) var(--space-md);
    }
}