/* COMPONENT LIBRARY */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-bg-base);
  border-bottom: 0.5px solid transparent;
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  transition: border-color var(--transition-base), background var(--transition-base);
}

.nav.scrolled {
  border-bottom-color: var(--color-border-subtle);
  background: color-mix(in srgb, var(--color-bg-base) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--landing-max-width);
  margin: 0 auto;
}

.nav-inner--feed {
  max-width: var(--content-max-width);
}

.nav-logo {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
  border: none;
  background: none;
  padding: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text-primary);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  padding: 10px var(--space-5);
  transition: opacity var(--transition-base), transform var(--transition-fast),
    background var(--transition-base), border-color var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  border: none;
  background: none;
}

.btn-primary {
  background: var(--color-text-primary);
  color: var(--color-bg-surface);
  border: 1px solid transparent;
}

.btn-primary:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.btn-primary:active {
  opacity: 1;
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 0.5px solid var(--color-border-default);
}

.btn-ghost:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-border-strong);
}

.btn-sm {
  font-size: var(--text-xs);
  padding: 7px var(--space-4);
}

.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  line-height: 1;
  padding: 4px 9px;
  border-radius: var(--radius-full);
  border: 0.5px solid;
  white-space: nowrap;
}

.tag-ai {
  background: var(--color-ai-bg);
  color: var(--color-ai-text);
  border-color: var(--color-ai-border);
}

.tag-cyber {
  background: var(--color-cyber-bg);
  color: var(--color-cyber-text);
  border-color: var(--color-cyber-border);
}

.tag-ml {
  background: var(--color-ml-bg);
  color: var(--color-ml-text);
  border-color: var(--color-ml-border);
}

.tag-hn {
  background: var(--color-hn-bg);
  color: var(--color-hn-text);
  border-color: var(--color-hn-border);
}

.tag-netsec {
  background: var(--color-netsec-bg);
  color: var(--color-netsec-text);
  border-color: var(--color-netsec-border);
}

.tag-gh {
  background: var(--color-gh-bg);
  color: var(--color-gh-text);
  border-color: var(--color-gh-border);
}

.tag-tips {
  background: var(--color-tips-bg);
  color: var(--color-tips-text);
  border-color: var(--color-tips-border);
}

.tag-aitools {
  background: var(--color-aitools-bg);
  color: var(--color-aitools-text);
  border-color: var(--color-aitools-border);
}

.feed-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-bottom: 0.5px solid var(--color-border-subtle);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: background var(--transition-fast);
  position: relative;
}

.feed-card:hover {
  background: var(--color-bg-subtle);
}

.feed-card:active {
  background: var(--color-bg-subtle);
}

.feed-card.featured {
  padding: var(--space-5) var(--space-5);
  background: var(--color-bg-subtle);
}

.feed-card.featured .card-title {
  font-size: var(--text-lg);
  font-family: var(--font-display);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.feed-card__thumb {
  width: 100%;
  max-height: 140px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-bg-subtle);
}

.feed-card__thumb img {
  width: 100%;
  height: 100%;
  max-height: 140px;
  object-fit: cover;
  display: block;
}

.skeleton-feed .skeleton-card:first-of-type {
  border-top: 0.5px solid var(--color-border-subtle);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.card-dot {
  width: 2px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-text-muted);
  flex-shrink: 0;
}

.card-source {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: var(--tracking-widest);
}

.card-time {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-left: auto;
}

.card-title {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  line-height: var(--leading-snug);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-tight);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-preview {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height var(--transition-slow), opacity var(--transition-slow);
}

.feed-card:hover .card-preview,
.feed-card.featured .card-preview {
  max-height: 80px;
  opacity: 1;
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-subtle) 25%,
    var(--color-border-subtle) 50%,
    var(--color-bg-subtle) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton-card {
  padding: var(--space-4) var(--space-5);
  border-bottom: 0.5px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.skeleton-tag {
  width: 80px;
  height: 20px;
}

.skeleton-title {
  width: 85%;
  height: 18px;
}

.skeleton-title-2 {
  width: 60%;
  height: 18px;
}

.date-divider {
  position: sticky;
  top: calc(var(--nav-height) + 49px);
  z-index: 10;
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-bg-base);
  border-bottom: 0.5px solid var(--color-border-subtle);
}

.feed-header-wrap {
  position: sticky;
  top: var(--nav-height);
  z-index: 20;
  background: var(--color-bg-base);
  border-bottom: 0.5px solid var(--color-border-subtle);
}

/* Fade shows there are more tabs (overlay scrollbars / touch); ::after must not be inside the scroller */
.feed-header-wrap:has(.feed-header--overflow:not(.feed-header--at-end))::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: clamp(32px, 12vw, 52px);
  pointer-events: none;
  background: linear-gradient(to left, var(--color-bg-base), transparent);
  z-index: 2;
}

.feed-header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  padding-bottom: var(--space-3);
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--color-text-muted) var(--color-bg-subtle);
}

/* Horizontal scrollbar visible (was hidden — tabs off-screen were undiscoverable) */
.feed-header::-webkit-scrollbar {
  display: block;
  height: 8px;
}

.feed-header::-webkit-scrollbar-track {
  background: var(--color-bg-subtle);
  border-radius: var(--radius-full);
}

.feed-header::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
}

.feed-header::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

.filter-tab {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-muted);
  padding: 6px var(--space-3);
  border-radius: var(--radius-full);
  border: 0.5px solid transparent;
  transition: color var(--transition-fast), background var(--transition-fast),
    border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  background: none;
  font-family: var(--font-body);
}

.filter-tab:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-subtle);
}

.filter-tab.active {
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
  border-color: var(--color-border-default);
  box-shadow: var(--shadow-xs);
}

.filter-tab:active {
  opacity: 0.92;
}

.feed-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  background: var(--color-bg-surface);
  border-left: 0.5px solid var(--color-border-subtle);
  border-right: 0.5px solid var(--color-border-subtle);
  min-height: 100vh;
}

.feed-page {
  background: var(--color-bg-base);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-20) var(--space-6);
  gap: var(--space-3);
  text-align: center;
}

.empty-icon {
  width: 40px;
  height: 40px;
  color: var(--color-text-muted);
  opacity: 0.5;
}

.empty-title {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}

.empty-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.ticker-wrap {
  overflow: hidden;
  border-top: 0.5px solid var(--color-border-subtle);
  border-bottom: 0.5px solid var(--color-border-subtle);
  padding: var(--space-3) 0;
  position: relative;
}

.ticker-wrap::before,
.ticker-wrap::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 80px;
  z-index: 2;
  pointer-events: none;
}

.ticker-wrap::before {
  left: 0;
  background: linear-gradient(to right, var(--color-bg-base), transparent);
}

.ticker-wrap::after {
  right: 0;
  background: linear-gradient(to left, var(--color-bg-base), transparent);
}

.ticker-track {
  display: flex;
  gap: var(--space-6);
  width: max-content;
  animation: ticker-scroll 40s linear infinite;
}

.ticker-track:hover {
  animation-play-state: paused;
}

@keyframes ticker-scroll {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

.ticker-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
  padding: 2px 0;
  cursor: pointer;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.ticker-item:hover {
  color: var(--color-text-primary);
}

.ticker-item .tag {
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .ticker-track {
    animation: none;
  }
}

/* Focus-visible (keyboard / assistive tech) */
.theme-toggle:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
}

.nav-logo:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

.btn:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
}

.filter-tab:focus-visible {
  position: relative;
  z-index: 1;
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
}

.feed-card:focus-visible,
.feed-row:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: calc(-1 * var(--focus-ring-offset));
}

.ticker-item:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

.spotlight-card:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
}

.discovery-card:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-text-link);
  outline-offset: var(--focus-ring-offset);
}

@media (max-width: 414px) {
  .nav {
    padding: 0 var(--space-4);
  }

  .nav-actions {
    gap: var(--space-2);
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .theme-toggle {
    min-width: 44px;
    min-height: 44px;
  }
}