/* ================================================================
   LXMUN · topics.css
   Styles for topics/index.html and topics/article.html
   Requires: global.css, components.css
   ================================================================ */


/* ── Hero ── */
.topics-hero {
  position: relative;
  padding-top: var(--navbar-h);
  padding-bottom: 0;           /* wave covers the bottom */
  min-height: 44vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  /* Richer gradient vs news page — two-tone diagonal */
  background: linear-gradient(
    135deg,
    #001845 0%,
    #003175 45%,
    #0b5cab 100%
  );
}

/* Full-bleed SVG canvas */
.topics-hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Spinning ring animations */
.svg-ring {
  transform-origin: center;
  transform-box: fill-box;
}
.svg-ring--1 { animation: ring-spin 40s linear infinite; }
.svg-ring--2 { animation: ring-spin 28s linear infinite reverse; }
.svg-ring--3 { animation: ring-spin 18s linear infinite; }

@keyframes ring-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.topics-hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding-block: var(--space-xl);
}

.topics-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 999px;
  font-size: var(--fs-xs);
  font-family: var(--font-latin);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.75);
  width: fit-content;
  backdrop-filter: blur(4px);
  background: rgba(255,255,255,0.07);
}

.topics-hero__title {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  letter-spacing: 0.4em;
  color: #fff;
  line-height: 1;
  margin-top: var(--space-xs);
}

.topics-hero__subtitle {
  font-family: var(--font-latin);
  font-size: clamp(0.85rem, 1.6vw, 1.1rem);
  font-weight: 300;
  letter-spacing: 0.25em;
  color: rgba(255,255,255,0.45);
  text-transform: uppercase;
}

.topics-hero__desc {
  font-size: var(--fs-sm);
  font-weight: 300;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.05em;
  margin-top: var(--space-xs);
}

/* Bottom wave transition */
.topics-hero__wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  line-height: 0;
}
.topics-hero__wave svg {
  display: block;
  width: 100%;
  height: 64px;
}


/* ── Topics List ── */
.topics-list {
  background: #fff;
  /* Subtle dot-grid background on the page body */
  background-image: radial-gradient(circle, #d0d8e8 1px, transparent 1px);
  background-size: 28px 28px;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.topics-grid__loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
}

.topics-grid__error {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-xl);
  color: #c0392b;
  font-size: var(--fs-sm);
}


/* ── Topic Card ── */
.tc-card {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  border: 1px solid rgba(0,49,117,0.08);
}
.tc-card:hover {
  box-shadow: var(--shadow-raised);
  transform: translateY(-5px);
}

/* Colored top accent bar — varies by tag/index */
.tc-card__accent {
  height: 5px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  flex-shrink: 0;
}
.tc-card[data-hue="warm"] .tc-card__accent {
  background: linear-gradient(to right, #1a5ca8, #2e86de);
}
.tc-card[data-hue="cool"] .tc-card__accent {
  background: linear-gradient(to right, #003175, #118ACB);
}
.tc-card[data-hue="mid"] .tc-card__accent {
  background: linear-gradient(to right, #0b5cab, #4fa3d1);
}

/* Cover image */
.tc-card__img {
  width: 100%;
  aspect-ratio: 16/9;
  background-size: cover;
  background-position: center;
  background-color: var(--color-bg-muted);
  flex-shrink: 0;
  transition: transform 0.4s ease;
}
.tc-card:hover .tc-card__img {
  transform: scale(1.03);
}

/* No-image fallback with SVG pattern */
.tc-card__img--none {
  aspect-ratio: 16/9;
  background-color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.tc-card__img--none::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.12) 1px, transparent 1px);
  background-size: 18px 18px;
}
.tc-card__img--none::after {
  content: 'LXMUN';
  position: relative;
  font-size: var(--fs-lg);
  font-weight: 900;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.15);
}

.tc-card__body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1;
}

.tc-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tc-card__tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--color-bg-hover);
  color: var(--color-accent);
  border: 1px solid rgba(11,92,171,0.2);
}

.tc-card__title {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.45;
  transition: color var(--transition-base);
}
.tc-card:hover .tc-card__title {
  color: var(--color-link);
}

.tc-card__excerpt {
  font-size: var(--fs-sm);
  color: var(--color-text);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tc-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-xs);
  border-top: 1px solid #eef0f4;
}

.tc-card__date {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.tc-card__arrow {
  font-size: var(--fs-sm);
  color: var(--color-accent);
  font-weight: 700;
  transition: transform var(--transition-base);
}
.tc-card:hover .tc-card__arrow {
  transform: translateX(4px);
}


/* ═══════════════════════════════
   ARTICLE PAGE
═══════════════════════════════ */

.topic-article-hero {
  position: relative;
  padding-top: var(--navbar-h);
  padding-bottom: var(--space-xl);
  min-height: 48vh;
  display: flex;
  align-items: flex-end;
  background: linear-gradient(135deg, #001845 0%, #003175 55%, #0b5cab 100%);
  overflow: hidden;
}

.topic-article-hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.topic-article-hero__overlay {
  position: absolute;
  inset: 0;
  /* Dark gradient toward bottom for text legibility */
  background: linear-gradient(
    to top,
    rgba(0, 18, 55, 0.70) 0%,
    rgba(0, 18, 55, 0.10) 100%
  );
}

.topic-article-hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 860px;
}

/* Breadcrumb */
.topic-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.06em;
}
.topic-breadcrumb a {
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  transition: color var(--transition-base);
}
.topic-breadcrumb a:hover {
  color: #fff;
  text-decoration: underline;
}

.topic-article-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* Hero tag pill */
.topic-hero-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid rgba(255,255,255,0.35);
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(4px);
}

.topic-article-hero__title {
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  font-weight: 900;
  letter-spacing: 0.07em;
  color: #fff;
  line-height: 1.25;
}

.topic-article-hero__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.topic-article-hero__date,
.topic-article-hero__author {
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.06em;
}
.topic-article-hero__author::before {
  content: '·';
  margin-right: var(--space-xs);
}


/* ── Article layout ── */
.topic-article-body {
  background: #fff;
  background-image: radial-gradient(circle, #d8dfe9 1px, transparent 1px);
  background-size: 28px 28px;
}

.topic-article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-xl);
  align-items: start;
}

/* ── Article content (Markdown) ── */
.topic-article-content {
  min-width: 0;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-xl);
  border: 1px solid rgba(0,49,117,0.07);
}

.topic-article-content__loading {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  padding: var(--space-xl) 0;
  letter-spacing: 0.1em;
}

.topic-article-content h1,
.topic-article-content h2,
.topic-article-content h3,
.topic-article-content h4 {
  color: var(--color-primary);
  font-weight: 800;
  line-height: 1.35;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.04em;
}
.topic-article-content h1 { font-size: var(--fs-xl); }
.topic-article-content h2 {
  font-size: var(--fs-lg);
  padding-bottom: 0.4em;
  border-bottom: 2px solid var(--color-bg-muted);
}
.topic-article-content h3 { font-size: var(--fs-md); }
.topic-article-content h4 { font-size: var(--fs-base); }

.topic-article-content p {
  font-size: var(--fs-base);
  color: #2a2a2a;
  line-height: 1.95;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
}

.topic-article-content img {
  width: 100%;
  border-radius: var(--radius-md);
  margin-block: var(--space-lg);
  box-shadow: var(--shadow-card);
}

.topic-article-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(to right, rgba(11,92,171,0.06), transparent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-block: var(--space-md);
}
.topic-article-content blockquote p {
  margin-bottom: 0;
  color: var(--color-accent-light);
  font-style: italic;
  font-weight: 500;
}

.topic-article-content ul,
.topic-article-content ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
}
.topic-article-content li {
  font-size: var(--fs-base);
  color: #2a2a2a;
  line-height: 1.9;
  margin-bottom: 0.3em;
  list-style: disc;
}
.topic-article-content ol li { list-style: decimal; }

.topic-article-content a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: opacity var(--transition-base);
}
.topic-article-content a:hover { opacity: 0.75; }

.topic-article-content strong {
  font-weight: 700;
  color: var(--color-primary);
}

.topic-article-content hr {
  border: none;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-divider), transparent);
  margin-block: var(--space-lg);
}

.topic-article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
  font-size: var(--fs-sm);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.topic-article-content th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  padding: 10px 16px;
  text-align: left;
  letter-spacing: 0.06em;
}
.topic-article-content td {
  padding: 10px 16px;
  border-bottom: 1px solid #e6e6e6;
  color: #333;
}
.topic-article-content tr:nth-child(even) td {
  background: var(--color-bg-muted);
}


/* ── Sidebar ── */
.topic-article-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: sticky;
  top: calc(var(--navbar-h) + var(--space-md));
}

.topic-sidebar-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid rgba(0,49,117,0.1);
  box-shadow: var(--shadow-card);
}

/* Accent card: blue gradient */
.topic-sidebar-card--accent {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-accent));
  border: none;
  color: #fff;
}

.topic-sidebar-card__icon {
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-xs);
}

.topic-sidebar-card__heading {
  font-size: var(--fs-sm);
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
  color: inherit;
}
.topic-sidebar-card:not(.topic-sidebar-card--accent) .topic-sidebar-card__heading {
  color: var(--color-primary);
}

.topic-sidebar-card__text {
  font-size: var(--fs-xs);
  line-height: 1.8;
}
.topic-sidebar-card--accent .topic-sidebar-card__text {
  color: rgba(255,255,255,0.75);
}
.topic-sidebar-card:not(.topic-sidebar-card--accent) .topic-sidebar-card__text {
  color: var(--color-text-muted);
}

.topic-sidebar-btn {
  display: inline-block;
  margin-top: var(--space-sm);
  padding: 8px 18px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background var(--transition-base);
}
.topic-sidebar-btn:hover {
  background: var(--color-accent);
}

/* Back card */
.topic-sidebar-card--back {
  background: linear-gradient(135deg, #001845, #003175);
  border: none;
}

.topic-sidebar-back {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: rgba(255,255,255,0.8);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color var(--transition-base);
}
.topic-sidebar-back:hover { color: #fff; }
.topic-sidebar-back span:first-child {
  font-size: var(--fs-md);
  transition: transform var(--transition-base);
}
.topic-sidebar-back:hover span:first-child {
  transform: translateX(-4px);
}


/* ── Responsive ── */
@media (max-width: 1024px) {
  .topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .topic-article-layout {
    grid-template-columns: 1fr;
  }
  .topic-article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }
  .topics-hero {
    min-height: 36vh;
  }
  .topics-hero__title {
    letter-spacing: 0.2em;
  }
  .topic-article-hero {
    min-height: 38vh;
  }
  .topic-article-content {
    padding: var(--space-md);
  }
  .topic-article-sidebar {
    grid-template-columns: 1fr;
  }
}