/* style.css — Mycelium Network Component Styles */

/* ─── Theme Transition ─── */
html {
  transition: background-color 0.4s ease, color 0.3s ease;
}
body {
  transition: background-color 0.4s ease, color 0.3s ease;
}

/* ─── Skip Link ─── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  z-index: 200;
  text-decoration: none;
}
.skip-link:focus {
  top: var(--space-2);
}

/* ─── Header ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s ease, background-color 0.4s ease;
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}
.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

/* Site logo / name */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.site-logo svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}
.site-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
@media (max-width: 480px) {
  .site-logo-text {
    font-size: clamp(0.65rem, 2.5vw, 0.875rem);
    letter-spacing: 0.08em;
  }
}

/* Desktop nav */
.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .nav-desktop { display: flex; }
}
.nav-desktop a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-1) 0;
  position: relative;
}
.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-accent);
}
.nav-desktop a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}
.nav-desktop a:hover::after,
.nav-desktop a.active::after {
  width: 100%;
}

/* Categories dropdown */
.categories-dropdown {
  position: relative;
}
.categories-dropdown-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-1) 0;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
}
.categories-dropdown-btn:hover {
  color: var(--color-accent);
}
.categories-dropdown-btn svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}
.categories-dropdown.open .categories-dropdown-btn svg {
  transform: rotate(180deg);
}
.categories-dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  min-width: 180px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  z-index: 110;
}
.categories-dropdown.open .categories-dropdown-menu {
  opacity: 1;
  visibility: visible;
}
.categories-dropdown-menu a {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.categories-dropdown-menu a:hover {
  background: var(--color-surface-2);
  color: var(--color-accent);
}

/* Header actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
}
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.icon-btn:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
.icon-btn svg {
  width: 20px;
  height: 20px;
}

/* Hamburger */
.hamburger-btn {
  display: flex;
}
@media (min-width: 768px) {
  .hamburger-btn { display: none; }
}

/* Mobile nav overlay */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: color-mix(in srgb, var(--color-bg) 96%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 150;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  display: flex;
  flex-direction: column;
}
.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}
.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}
.mobile-nav-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6) var(--space-4);
}
.mobile-nav-body a {
  display: block;
  padding: var(--space-3) 0;
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  border-bottom: 1px solid var(--color-divider);
}
.mobile-nav-body a:hover {
  color: var(--color-accent);
}
.mobile-nav-categories-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}
.mobile-nav-body .category-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  border-bottom: none;
  padding: var(--space-2) 0;
  color: var(--color-text-muted);
}

/* ─── Hero Section ─── */
.hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    color-mix(in srgb, var(--color-bg) 40%, transparent) 0%,
    color-mix(in srgb, var(--color-bg) 70%, transparent) 50%,
    var(--color-bg) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-16) var(--space-4) var(--space-12);
  max-width: var(--content-default);
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  text-shadow: 0 2px 20px oklch(0 0 0 / 0.4);
}
.hero-tagline {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  font-style: italic;
  max-width: 36ch;
  margin: 0 auto;
}

/* ─── Category Filter Chips ─── */
.filter-section {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-2);
}
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}
.filter-chip {
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  min-height: 36px;
  display: flex;
  align-items: center;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.filter-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.filter-chip.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* ─── Post Grid ─── */
.posts-section {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-12);
}
.post-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .post-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  content-visibility: auto;
  contain-intrinsic-size: 0 200px;
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}
.post-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.post-type-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  color: var(--color-accent);
  flex-shrink: 0;
}
.post-type-icon svg {
  width: 16px;
  height: 16px;
}
.post-card-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.post-card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}
.post-card-title a {
  text-decoration: none;
  color: inherit;
}
.post-card-title a:hover {
  color: var(--color-accent);
}
.post-card-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}
.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.post-tag {
  font-size: var(--text-xs);
  color: var(--color-amber);
  background: color-mix(in srgb, var(--color-amber) 10%, transparent);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.post-tag:hover {
  background: color-mix(in srgb, var(--color-amber) 20%, transparent);
}

/* ─── Post Detail View ─── */
.post-view {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-8) var(--space-4) var(--space-12);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--color-accent);
}
.breadcrumb-separator {
  color: var(--color-text-faint);
  user-select: none;
}
.breadcrumb-current {
  color: var(--color-text-muted);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-accent);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-6);
}
.back-link:hover {
  color: var(--color-accent-hover);
}
.back-link svg {
  width: 16px;
  height: 16px;
}

.post-detail-header {
  margin-bottom: var(--space-8);
}
.post-detail-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.post-detail-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.post-detail-type {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-transform: capitalize;
}
.post-detail-type svg {
  width: 14px;
  height: 14px;
}
.post-detail-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}
.post-detail-categories {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Post body prose */
.post-body {
  max-width: 65ch;
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
}
.post-body p {
  margin-bottom: var(--space-4);
}
.post-body blockquote {
  border-left: 3px solid var(--color-accent);
  margin: var(--space-6) 0;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-text-muted);
}
.post-body hr {
  border: none;
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-8) 0;
}
.post-body em {
  color: var(--color-amber);
}
.post-body .post-date-inline {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* Prev/Next navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}
@media (min-width: 768px) {
  .post-nav {
    grid-template-columns: 1fr 1fr;
  }
}
.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.post-nav-link:hover {
  border-color: var(--color-accent);
  background: var(--color-surface);
}
.post-nav-link--next {
  text-align: right;
}
@media (min-width: 768px) {
  .post-nav-link--next {
    grid-column: 2;
  }
}
.post-nav-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.post-nav-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}

/* Related posts */
.related-posts {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}
.related-posts h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}
.related-posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 768px) {
  .related-posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ─── About Page ─── */
.about-view {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-12) var(--space-4) var(--space-16);
}
.about-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}
.about-body {
  max-width: 65ch;
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-muted);
}
.about-body p {
  margin-bottom: var(--space-4);
}
.about-categories {
  margin-top: var(--space-8);
}
.about-categories h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.about-categories-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
}
.about-categories-list li a {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: all 0.2s ease;
}
.about-categories-list li a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ─── Category View ─── */
.category-view-header {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-10) var(--space-4) var(--space-4);
}
.category-view-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
}
.category-view-count {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-top: var(--space-1);
}

/* ─── Search Overlay ─── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-16) var(--space-4) var(--space-8);
}
.search-overlay.open {
  opacity: 1;
  visibility: visible;
}
.search-container {
  width: 100%;
  max-width: 560px;
}
.search-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}
.search-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}
.search-input-wrap {
  position: relative;
  margin-bottom: var(--space-6);
}
.search-input-wrap svg {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-text-faint);
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-10);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--color-text);
  outline: none;
}
.search-input::placeholder {
  color: var(--color-text-faint);
}
.search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent);
}
.search-results {
  max-height: 50vh;
  overflow-y: auto;
}
.search-result-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background 0.15s ease;
}
.search-result-item:hover {
  background: var(--color-surface-2);
}
.search-result-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}
.search-result-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.search-no-results {
  text-align: center;
  padding: var(--space-8);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

/* ─── Footer ─── */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-12) var(--space-4) var(--space-8);
  transition: background-color 0.4s ease;
}
.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
  }
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-brand-name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
}
.footer-brand-desc {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.6;
  max-width: 32ch;
}
.footer-section h3 {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}
.footer-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-section ul li a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}
.footer-section ul li a:hover {
  color: var(--color-accent);
}
.footer-bottom {
  max-width: var(--content-wide);
  margin: var(--space-8) auto 0;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}
.footer-attribution {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer-attribution a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-attribution a:hover {
  color: var(--color-accent);
}

/* Back to top */
.back-to-top {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-text-faint);
  text-decoration: none;
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
}
.back-to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.back-to-top svg {
  width: 14px;
  height: 14px;
}

/* ─── Empty States ─── */
.empty-state {
  text-align: center;
  padding: var(--space-12);
  color: var(--color-text-faint);
}
.empty-state svg {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  opacity: 0.4;
}
.empty-state p {
  font-size: var(--text-sm);
  max-width: 40ch;
  margin: 0 auto;
}

/* ─── Loading Skeleton ─── */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface) 25%,
    var(--color-surface-2) 50%,
    var(--color-surface) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}