/* ==========================================================================
   news-item.css — Article detail template styles
   Depends on: tokens.css, global.css, components.css
   ========================================================================== */


/* ==========================================================================
   ARTICLE HEADER (.ni-header)
   ========================================================================== */

.ni-header {
  padding-top: calc(var(--sp-20) + 80px);
  padding-bottom: var(--sp-10);
  text-align: center;
}

.ni-header__back {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-muted);
  text-decoration: none;
  margin-bottom: var(--sp-6);
  transition:
    color var(--duration-base) var(--ease-out),
    gap var(--duration-base) var(--ease-out);
}

.ni-header__back:hover {
  color: var(--color-primary);
  gap: var(--sp-3);
}

.ni-header__reading-time {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.ni-header__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}

.ni-header__category {
  display: inline-block;
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-full);
  background-color: var(--color-surface-light);
  color: var(--color-primary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ni-header__date {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.ni-header__dot {
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background-color: var(--color-text-muted);
}

.ni-header h1 {
  max-width: 18ch;
  margin-inline: auto;
  margin-bottom: var(--sp-4);
}

.ni-header__author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
}

.ni-header__author-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background-color: var(--color-surface-light);
}

.ni-header__author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ni-header__author-name {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
}

.ni-header__author-role {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}


/* ==========================================================================
   HERO IMAGE (.ni-hero-image)
   ========================================================================== */

.ni-hero-image {
  max-width: var(--container-default);
  margin-inline: auto;
  padding-inline: var(--sp-6);
  margin-bottom: var(--sp-12);
}

.ni-hero-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  aspect-ratio: 21 / 9;
  object-fit: cover;
}


/* ==========================================================================
   ARTICLE LAYOUT (.ni-layout)
   Content + sidebar for TOC
   ========================================================================== */

.ni-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-12);
  max-width: var(--container-default);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

@media (min-width: 1280px) {
  .ni-layout {
    grid-template-columns: 1fr 260px;
  }
}


/* ==========================================================================
   ARTICLE INTRO (.ni-intro)
   ========================================================================== */

.ni-intro {
  font-size: var(--fs-lg);
  color: var(--color-text-body);
  line-height: var(--lh-normal);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--sp-8);
  padding-bottom: var(--sp-8);
  border-bottom: 1px solid var(--color-border);
}


/* ==========================================================================
   RICH TEXT BODY (.ni-body)
   ========================================================================== */

.ni-body h2 {
  margin-top: var(--sp-10);
  margin-bottom: var(--sp-4);
}

.ni-body h3 {
  margin-top: var(--sp-8);
  margin-bottom: var(--sp-3);
}

.ni-body p {
  color: var(--color-text-body);
  margin-bottom: var(--sp-4);
  line-height: var(--lh-normal);
}

.ni-body ul,
.ni-body ol {
  margin-bottom: var(--sp-6);
  padding-left: var(--sp-6);
}

.ni-body li {
  margin-bottom: var(--sp-2);
  color: var(--color-text-body);
}

.ni-body blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--sp-6);
  margin-block: var(--sp-8);
  font-style: italic;
  color: var(--color-text-muted);
  font-size: var(--fs-lg);
}

.ni-body img {
  width: 100%;
  border-radius: var(--radius-lg);
  margin-block: var(--sp-8);
}


/* ==========================================================================
   TABLE OF CONTENTS (.ni-toc)
   Sticky sidebar on desktop, collapsible on mobile
   ========================================================================== */

.ni-toc {
  display: none;
}

@media (min-width: 1280px) {
  .ni-toc {
    display: block;
    position: sticky;
    top: calc(80px + var(--sp-8));
    align-self: start;
  }
}

.ni-toc__title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--sp-4);
}

.ni-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ni-toc__link {
  display: block;
  padding: var(--sp-2) 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: var(--sp-4);
  transition:
    color var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out);
}

.ni-toc__link:hover,
.ni-toc__link--active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

/* Mobile TOC toggle */
.ni-toc-mobile {
  margin-bottom: var(--sp-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
}

@media (min-width: 1280px) {
  .ni-toc-mobile {
    display: none;
  }
}

.ni-toc-mobile__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  font-family: var(--font-base);
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  color: var(--color-text-heading);
  cursor: pointer;
  padding: 0;
}

.ni-toc-mobile__toggle svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  transition: transform var(--duration-base) var(--ease-out);
}

.ni-toc-mobile__list {
  list-style: none;
  padding: 0;
  margin: 0;
  margin-top: var(--sp-3);
  display: none;
}

.ni-toc-mobile__list--open {
  display: block;
}

.ni-toc-mobile__toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.ni-toc-mobile__list a {
  display: block;
  padding: var(--sp-2) 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}

.ni-toc-mobile__list a:hover {
  color: var(--color-primary);
}


/* ==========================================================================
   RELATED ARTICLES (.ni-related)
   ========================================================================== */

.ni-related__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
}

@media (min-width: 768px) {
  .ni-related__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1280px) {
  .ni-related__grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}


/* Section override — remove top padding (follows hero image) */
.ni-content-section {
  padding-top: 0;
}