/* ===== News/Paper Card ===== */
.card {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  padding: 20px;
  transition: box-shadow 0.2s ease, transform 0.1s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--elevation-2);
  transform: translateY(-1px);
}

.card__header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.card__source-badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.4;
}

.card__source-badge--hn { background: #FFF3E0; color: var(--color-hn); }
.card__source-badge--devto { background: #E8EAF6; color: var(--color-devto); }
.card__source-badge--reddit { background: #FBE9E7; color: var(--color-reddit); }
.card__source-badge--arxiv { background: #FFEBEE; color: var(--color-arxiv); }
.card__source-badge--semantic { background: #E3F2FD; color: var(--color-semantic); }
.card__source-badge--huggingface { background: #FFF8E1; color: #E65100; }
.card__source-badge--rss { background: #FFF3E0; color: var(--color-rss); }
.card__source-badge--major { background: #E8F5E9; color: #1B5E20; font-weight: 700; }
.card__source-badge--vllm { background: #FFF3E0; color: #E65100; }
.card__source-badge--nvidia { background: #E8F5E9; color: #76B900; }
.card__source-badge--anthropic { background: #F3E5F5; color: #6A1B9A; }
.card__source-badge--openai { background: #E8F5E9; color: #2E7D32; }
.card__source-badge--google { background: #E3F2FD; color: #1565C0; }

.card__score {
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  opacity: 0.7;
}

.card__score--high { background: var(--md-green-600); }
.card__score--medium { background: var(--md-yellow-700); }
.card__score--low { background: var(--md-grey-400); }

.card__title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--md-grey-900);
  flex: 1;
}

.card__title a {
  color: inherit;
  text-decoration: none;
}

.card__title a:hover {
  color: var(--md-primary-600);
  text-decoration: none;
}

.card__description {
  font-size: 13px;
  color: var(--md-grey-700);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--md-grey-600);
  flex-wrap: wrap;
}

.card__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.card__meta-item .material-icons-outlined {
  font-size: 15px;
}

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

.card__tag {
  font-size: 11px;
  color: var(--md-primary-700);
  background: var(--md-primary-50);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* ===== Resource Card ===== */
.resource-card {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  padding: 20px;
  transition: box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.resource-card:hover {
  box-shadow: var(--elevation-2);
}

.resource-card__header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.resource-card__cost {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.resource-card__cost--free { background: #E8F5E9; color: var(--md-green-600); }
.resource-card__cost--freemium { background: #FFF8E1; color: #F57F17; }
.resource-card__cost--paid { background: #FCE4EC; color: #C62828; }

.resource-card__level {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.resource-card__level--beginner { background: #E3F2FD; color: #1565C0; }
.resource-card__level--intermediate { background: #F3E5F5; color: #7B1FA2; }
.resource-card__level--advanced { background: #FFF3E0; color: #E65100; }

.resource-card__title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  color: var(--md-grey-900);
}

.resource-card__title a {
  color: inherit;
}

.resource-card__title a:hover {
  color: var(--md-primary-600);
}

.resource-card__description {
  font-size: 13px;
  color: var(--md-grey-700);
  line-height: 1.5;
  flex: 1;
}

.resource-card__provider {
  font-size: 12px;
  color: var(--md-grey-600);
  display: flex;
  align-items: center;
  gap: 4px;
}

.resource-card__provider .material-icons-outlined {
  font-size: 15px;
}

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

.resource-card__tag {
  font-size: 11px;
  color: var(--md-grey-700);
  background: var(--md-grey-100);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* ===== Podcasts Section Headings ===== */
.podcasts-section-heading {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  color: var(--md-grey-800);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 24px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--md-grey-200);
}

.podcasts-section-heading .material-icons-outlined {
  font-size: 20px;
  color: var(--md-primary-600);
}

.podcasts-section-heading__count {
  font-size: 13px;
  font-weight: 400;
  color: var(--md-grey-500);
}

.podcasts-section-heading--channels {
  margin-top: 40px;
}

/* ===== Popular Episodes — Horizontal Scroll Row ===== */
.popular-episodes {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: 4px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--md-grey-300) transparent;
}

.popular-episodes::-webkit-scrollbar {
  height: 6px;
}

.popular-episodes::-webkit-scrollbar-thumb {
  background: var(--md-grey-300);
  border-radius: 3px;
}

/* ===== Popular Episode Card ===== */
.popular-episode {
  display: flex;
  flex-direction: column;
  width: 280px;
  min-width: 280px;
  scroll-snap-align: start;
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  overflow: hidden;
  text-decoration: none;
  color: var(--md-grey-900);
  transition: box-shadow 0.2s ease, transform 0.15s ease;
}

.popular-episode:hover {
  box-shadow: var(--elevation-2);
  transform: translateY(-2px);
}

.popular-episode__img {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--md-grey-100);
  overflow: hidden;
}

.popular-episode__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.popular-episode__play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 48px;
  color: rgba(255, 255, 255, 0.9);
  opacity: 0;
  transition: opacity 0.2s ease;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

.popular-episode:hover .popular-episode__play {
  opacity: 1;
}

.popular-episode__duration {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 3px;
}

.popular-episode__body {
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.popular-episode__title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.popular-episode__channel {
  font-size: 12px;
  color: var(--md-grey-600);
}

.popular-episode__meta {
  display: flex;
  gap: 12px;
  font-size: 11px;
  color: var(--md-grey-500);
  margin-top: auto;
}

.popular-episode__meta span {
  display: flex;
  align-items: center;
  gap: 3px;
}

.popular-episode__meta .material-icons-outlined {
  font-size: 13px;
}

.popular-episode__views {
  font-weight: 600;
  color: var(--md-grey-700);
}

/* ===== Channel Group (Podcaster Card) ===== */
/* Podcasters 2-column grid container */
#podcastsChannelGroups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  align-items: start;
}

/* Individual channel card — compact vertical stack */
.channel-group {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  padding: 14px;
  transition: box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.channel-group:hover {
  box-shadow: var(--elevation-2);
}

/* Header: category badge + title + meta inline */
.channel-group__header {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-group__title-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.channel-group__category {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.channel-group__category--interviews { background: #E3F2FD; color: #1565C0; }
.channel-group__category--news { background: #FFF3E0; color: #E65100; }
.channel-group__category--technical { background: #F3E5F5; color: #7B1FA2; }
.channel-group__category--educational { background: #E8F5E9; color: var(--md-green-600); }

.channel-group__name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--md-grey-900);
  line-height: 1.2;
}

.channel-group__name a {
  color: inherit;
  text-decoration: none;
}

.channel-group__name a:hover {
  color: var(--md-primary-600);
}

/* Inline meta row: host + subscribers */
.channel-group__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--md-grey-500);
}

.channel-group__meta span {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

.channel-group__meta .material-icons-outlined {
  font-size: 13px;
}

.channel-group__desc {
  font-size: 12px;
  color: var(--md-grey-600);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
}

/* 3 video thumbnails in a row */
.channel-group__videos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.channel-group__video {
  display: flex;
  flex-direction: column;
  gap: 3px;
  text-decoration: none;
  color: var(--md-grey-900);
  transition: transform 0.15s ease;
}

.channel-group__video:hover {
  transform: translateY(-2px);
}

.channel-group__video-img {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--md-grey-100);
}

.channel-group__video-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.channel-group__video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 24px;
  color: rgba(255, 255, 255, 0.9);
  opacity: 0;
  transition: opacity 0.2s ease;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.channel-group__video:hover .channel-group__video-play {
  opacity: 1;
}

.channel-group__video-title {
  font-size: 10px;
  font-weight: 500;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.channel-group--no-videos {
  /* no special rules needed — card just won't have video section */
}

/* ===== Podcast Mobile Overrides ===== */
@media (max-width: 600px) {
  .popular-episode {
    width: 240px;
    min-width: 240px;
  }

  .popular-episode__title {
    font-size: 13px;
  }

  .popular-episode__body {
    padding: 10px 12px;
  }

  #podcastsChannelGroups {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .channel-group {
    padding: 12px;
  }

  .channel-group__videos {
    gap: 6px;
  }

  .podcasts-section-heading {
    font-size: 14px;
    margin: 16px 0 8px;
  }

  .podcasts-section-heading--channels {
    margin-top: 24px;
  }
}

/* Tablet: 2 columns still fits */
@media (min-width: 601px) and (max-width: 900px) {
  #podcastsChannelGroups {
    gap: 10px;
  }

  .channel-group {
    padding: 12px;
  }

  .channel-group__name {
    font-size: 13px;
  }

  .channel-group__desc {
    -webkit-line-clamp: 1;
  }
}

/* ===== Filter Chips ===== */
.filter-chip {
  font-family: var(--font-primary);
  font-size: 12px;
  font-weight: 500;
  color: var(--md-grey-600);
  background: var(--md-surface);
  border: 1px solid var(--md-grey-200);
  border-radius: var(--radius-full);
  padding: 5px 14px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.filter-chip:hover {
  background: var(--md-grey-50);
  border-color: var(--md-grey-300);
}

.filter-chip.active {
  background: var(--md-primary-50);
  color: var(--md-primary-700);
  border-color: var(--md-primary-200);
}

.filter-chip--inference {
  border-color: #E65100;
  color: #E65100;
}

.filter-chip--inference.active {
  background: #FFF3E0;
  color: #E65100;
  border-color: #FFB74D;
}

/* Topic Filters */
.topic-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 0 8px;
  flex-wrap: wrap;
}

/* ===== Load More Button ===== */
.load-more-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 12px 24px;
  margin-top: 16px;
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 500;
  color: var(--md-primary-700);
  background: var(--md-surface);
  border: 1px solid var(--md-grey-200);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.load-more-btn:hover {
  background: var(--md-primary-50);
  border-color: var(--md-primary-200);
}

.load-more-btn .material-icons-outlined {
  font-size: 20px;
}

.load-more-btn__count {
  font-size: 12px;
  font-weight: 400;
  color: var(--md-grey-500);
}

@media (max-width: 600px) {
  .load-more-btn {
    padding: 10px 16px;
    font-size: 13px;
  }
}

/* ===== Skeleton Loader ===== */
.skeleton {
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.skeleton-card {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skeleton-line {
  height: 14px;
  background: var(--md-grey-200);
  border-radius: 4px;
}

.skeleton-line--short {
  width: 60%;
}

.skeleton-line--badge {
  width: 60px;
  height: 20px;
  border-radius: var(--radius-full);
}

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

.skeleton-line--meta {
  width: 40%;
  height: 12px;
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.toast {
  background: var(--md-grey-900);
  color: white;
  font-size: 14px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  box-shadow: var(--elevation-3);
  animation: toast-in 0.3s ease;
  max-width: 400px;
  text-align: center;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast--error {
  background: var(--md-red-600);
}

.toast--success {
  background: var(--md-green-600);
}

.toast .material-icons-outlined {
  font-size: 18px;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast.toast-out {
  animation: toast-out 0.3s ease forwards;
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(20px);
  }
}

/* ===== Category Section ===== */
.category-section {
  margin-bottom: 32px;
}

.category-section__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 400;
  color: var(--md-grey-800);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--md-grey-200);
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-section__title .material-icons-outlined {
  font-size: 22px;
  color: var(--md-primary-600);
}

/* ===== Resources Filters ===== */
.resources-filter-bar {
  display: flex;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-group__label {
  font-size: 12px;
  font-weight: 500;
  color: var(--md-grey-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== Mobile Component Overrides ===== */
@media (max-width: 600px) {
  .card {
    padding: 14px;
    gap: 8px;
  }

  .card__title {
    font-size: 14px;
  }

  .card__description {
    font-size: 12px;
    -webkit-line-clamp: 2;
  }

  .card__meta {
    gap: 10px;
    font-size: 11px;
  }

  .card__source-badge {
    font-size: 9px;
    padding: 2px 6px;
  }

  .card__tag {
    font-size: 10px;
    padding: 1px 6px;
  }

  .resource-card {
    padding: 14px;
    gap: 8px;
  }

  .resource-card__title {
    font-size: 14px;
  }

  .resource-card__description {
    font-size: 12px;
  }

  .filter-chip {
    font-size: 12px;
    padding: 5px 12px;
  }

  .skeleton-card {
    padding: 14px;
  }

  .category-section__title {
    font-size: 16px;
  }

  .resources-filter-bar {
    gap: 12px;
    margin-bottom: 16px;
  }

  .filter-group {
    gap: 6px;
    flex-wrap: wrap;
  }
}

/* ===== Learning Path (AI Engineer Tab) ===== */
.learning-path {
  max-width: 1100px;
  margin: 0 auto;
  padding-bottom: 48px;
}

/* Hero */
.learning-path__hero {
  background: linear-gradient(135deg, var(--md-primary-50) 0%, #F0F4FF 50%, #F5F0FF 100%);
  border: 1px solid var(--md-grey-200);
  border-radius: var(--radius-md);
  padding: 24px 24px 18px;
  margin-bottom: 28px;
}

.learning-path__hero-content {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.learning-path__hero-icon {
  font-size: 36px;
  color: var(--md-primary-600);
  flex-shrink: 0;
}

.learning-path__hero-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: var(--md-grey-900);
  margin-bottom: 4px;
}

.learning-path__hero-subtitle {
  font-size: 14px;
  color: var(--md-grey-700);
  line-height: 1.5;
}

.learning-path__hero-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.learning-path__hero-stat {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  font-weight: 500;
  color: var(--md-grey-600);
}

.learning-path__hero-stat .material-icons-outlined {
  font-size: 16px;
  color: var(--md-primary-600);
}

/* ===== Controls row (between fork and tracks) ===== */
.learning-path__controls {
  display: flex;
  justify-content: flex-end;
  padding: 0 4px 12px;
}

.learning-path__expand-all {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 2px;
  font-family: var(--font-primary);
  font-size: 13px;
  font-weight: 500;
  color: var(--md-primary-600);
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.15s ease;
}

.learning-path__expand-all:hover {
  color: var(--md-primary-800);
  text-decoration: underline;
}

.learning-path__expand-all .material-icons-outlined {
  font-size: 18px;
}

/* Section heading */
.learning-path__section-heading {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--md-grey-700);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.learning-path__section-heading .material-icons-outlined {
  font-size: 18px;
  color: var(--md-primary-600);
}

.learning-path__section-heading-sub {
  font-weight: 400;
  color: var(--md-grey-500);
  margin-left: 4px;
}

/* ===== Foundation — Horizontal card pair ===== */
.learning-path__foundation {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-bottom: 8px;
}

.learning-path__foundation-card {
  flex: 1;
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  padding: 20px;
  position: relative;
  transition: box-shadow 0.2s ease, transform 0.1s ease;
}

.learning-path__foundation-card:hover {
  box-shadow: var(--elevation-2);
  transform: translateY(-1px);
}

.learning-path__foundation-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #34A853, #1E8E3E);
  color: #fff;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  box-shadow: 0 2px 8px rgba(52, 168, 83, 0.3);
}

.learning-path__foundation-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  color: var(--md-grey-900);
  margin-bottom: 4px;
}

.learning-path__foundation-card .learning-path__duration {
  margin-bottom: 10px;
}

.learning-path__foundation-arrow {
  display: flex;
  align-items: center;
  padding: 0 8px;
  color: var(--md-grey-400);
  flex-shrink: 0;
}

.learning-path__foundation-arrow .material-icons-outlined {
  font-size: 24px;
}

/* Stage label badge */
.learning-path__stage-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  line-height: 1.4;
}

.learning-path__stage-label--green { background: #E8F5E9; color: #1B5E20; }
.learning-path__stage-label--blue { background: #E3F2FD; color: #1565C0; }
.learning-path__stage-label--purple { background: #F3E5F5; color: #6A1B9A; }
.learning-path__stage-label--orange { background: #FFF3E0; color: #E65100; }

/* Duration badge */
.learning-path__duration {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--md-grey-600);
}

.learning-path__duration .material-icons-outlined {
  font-size: 14px;
}

/* Resource links */
.learning-path__resources {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--md-grey-100);
}

.learning-path__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 0;
  font-size: 13px;
  font-weight: 400;
  color: var(--md-primary-700);
  text-decoration: none;
  border-bottom: 1px solid var(--md-grey-100);
  transition: color 0.15s ease, padding-left 0.15s ease;
}

.learning-path__link:last-child {
  border-bottom: none;
}

.learning-path__link:hover {
  color: var(--md-primary-800);
  text-decoration: none;
  padding-left: 4px;
}

.learning-path__link .material-icons-outlined {
  font-size: 15px;
  color: var(--md-grey-400);
  flex-shrink: 0;
}

.learning-path__cost {
  margin-left: auto;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.learning-path__cost--free { background: #E8F5E9; color: var(--md-green-600); }
.learning-path__cost--freemium { background: #FFF8E1; color: #F57F17; }
.learning-path__cost--paid { background: #FCE4EC; color: #C62828; }

/* ===== Fork Divider ===== */
.learning-path__fork {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--md-grey-700);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px 0 8px;
  margin: 16px 0 24px;
}

.learning-path__fork::before,
.learning-path__fork::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--md-grey-300);
}

.learning-path__fork .material-icons-outlined {
  font-size: 20px;
  color: var(--md-primary-600);
}

/* ===== Track Grid with Fork Connectors ===== */
.learning-path__tracks {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 32px;
  align-items: start;
}

.learning-path__tracks::before {
  content: '';
  position: absolute;
  top: 0;
  left: 16.66%;
  right: 16.66%;
  height: 28px;
  border-left: 2px solid var(--md-grey-300);
  border-right: 2px solid var(--md-grey-300);
  border-top: 2px solid var(--md-grey-300);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.learning-path__tracks::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 28px;
  background: var(--md-grey-300);
  transform: translateX(-1px);
}

/* ===== Track Card ===== */
.learning-path__track {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-1);
  border-top: 4px solid transparent;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.learning-path__track:hover {
  box-shadow: var(--elevation-2);
}

.learning-path__track--blue  { border-top-color: #1A73E8; }
.learning-path__track--orange { border-top-color: #E65100; }
.learning-path__track--purple { border-top-color: #7B1FA2; }

/* Track header */
.learning-path__track-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--md-grey-100);
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ===== Track Badge — Ring + Icon + Label ===== */
.learning-path__track-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.learning-path__track-badge-ring {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  position: relative;
}

.learning-path__track-badge-ring::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 2px solid transparent;
  opacity: 0.3;
}

.learning-path__track-badge-ring .material-icons-outlined {
  font-size: 24px;
}

.learning-path__track--blue .learning-path__track-badge-ring {
  background: linear-gradient(135deg, #1A73E8, #4285F4);
  box-shadow: 0 3px 12px rgba(26, 115, 232, 0.35);
}
.learning-path__track--blue .learning-path__track-badge-ring::after {
  border-color: #1A73E8;
}

.learning-path__track--orange .learning-path__track-badge-ring {
  background: linear-gradient(135deg, #E65100, #FF8F00);
  box-shadow: 0 3px 12px rgba(230, 81, 0, 0.35);
}
.learning-path__track--orange .learning-path__track-badge-ring::after {
  border-color: #E65100;
}

.learning-path__track--purple .learning-path__track-badge-ring {
  background: linear-gradient(135deg, #7B1FA2, #AB47BC);
  box-shadow: 0 3px 12px rgba(123, 31, 162, 0.35);
}
.learning-path__track--purple .learning-path__track-badge-ring::after {
  border-color: #7B1FA2;
}

.learning-path__track-badge-label {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--md-grey-600);
}

.learning-path__track-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  color: var(--md-grey-900);
  margin-bottom: 2px;
}

.learning-path__track-desc {
  font-size: 12px;
  color: var(--md-grey-600);
  line-height: 1.5;
}

/* ===== Track Body — Stage rail with dots ===== */
.learning-path__track-body {
  position: relative;
}

.learning-path__track-stage {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--md-grey-100);
}

.learning-path__track-stage:last-child {
  border-bottom: none;
}

/* Stage progress dot + rail */
.learning-path__track-stage-dot {
  width: 36px;
  flex-shrink: 0;
  position: relative;
  display: flex;
  justify-content: center;
}

.learning-path__track-stage-dot::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  position: absolute;
  top: 22px;
  z-index: 1;
}

.learning-path__track-stage-dot::after {
  content: '';
  position: absolute;
  top: 32px;
  bottom: 0;
  width: 2px;
  opacity: 0.3;
}

.learning-path__track-stage:last-child .learning-path__track-stage-dot::after {
  display: none;
}

/* Rail colors per track */
.learning-path__track--blue .learning-path__track-stage-dot::before {
  background: #1A73E8;
  box-shadow: 0 0 0 3px #E3F2FD;
}
.learning-path__track--blue .learning-path__track-stage-dot::after { background: #1A73E8; }

.learning-path__track--orange .learning-path__track-stage-dot::before {
  background: #E65100;
  box-shadow: 0 0 0 3px #FFF3E0;
}
.learning-path__track--orange .learning-path__track-stage-dot::after { background: #E65100; }

.learning-path__track--purple .learning-path__track-stage-dot::before {
  background: #7B1FA2;
  box-shadow: 0 0 0 3px #F3E5F5;
}
.learning-path__track--purple .learning-path__track-stage-dot::after { background: #7B1FA2; }

.learning-path__track-stage-content {
  flex: 1;
  padding: 14px 16px 14px 0;
  min-width: 0;
  cursor: pointer;
}

.learning-path__track-stage-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  flex-wrap: wrap;
  cursor: pointer;
  user-select: none;
}

.learning-path__track-stage-header::after {
  content: 'expand_more';
  font-family: 'Material Icons Outlined';
  font-size: 20px;
  color: var(--md-grey-400);
  margin-left: auto;
  transition: transform 0.3s ease, color 0.2s ease;
  flex-shrink: 0;
  -webkit-font-feature-settings: 'liga';
  font-feature-settings: 'liga';
  line-height: 1;
  direction: ltr;
}

.learning-path__track-stage.is-expanded .learning-path__track-stage-header::after {
  transform: rotate(180deg);
  color: var(--md-grey-600);
}

.learning-path__track-stage-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--md-grey-900);
  margin-bottom: 0;
  transition: color 0.2s ease;
}

.learning-path__track-stage.is-expanded .learning-path__track-stage-title {
  margin-bottom: 4px;
}

.learning-path__track-stage:hover .learning-path__track-stage-title {
  color: var(--md-primary-700);
}

.learning-path__track-stage .learning-path__resources {
  border-top: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.25s ease;
  opacity: 0;
}

.learning-path__track-stage.is-expanded .learning-path__resources {
  max-height: 600px;
  opacity: 1;
}

/* ===== Trending Sub-Section (collapsible within each stage) ===== */
.learning-path__trending {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.25s ease;
}

.learning-path__track-stage.is-expanded .learning-path__trending {
  max-height: 40px;
  opacity: 1;
}

.learning-path__track-stage.is-expanded .learning-path__trending.is-trending-open {
  max-height: 500px;
}

.learning-path__trending-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  margin-top: 6px;
  font-size: 10px;
  font-weight: 600;
  color: var(--md-primary-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--md-primary-50);
  border: 1px solid var(--md-primary-100, #C2D9F7);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.learning-path__trending-toggle:hover {
  background: var(--md-primary-100, #C2D9F7);
  color: var(--md-primary-700);
}

.learning-path__trending-toggle .material-icons-outlined {
  font-size: 14px;
}

.learning-path__trending-links {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.2s ease;
  border-top: 1px dashed var(--md-grey-200);
}

.learning-path__trending.is-trending-open .learning-path__trending-links {
  max-height: 300px;
  opacity: 1;
}

.learning-path__trending-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 0;
  font-size: 11px;
  color: var(--md-grey-600);
  text-decoration: none;
  transition: color 0.15s ease;
}

.learning-path__trending-links a:hover {
  color: var(--md-primary-700);
}

.learning-path__trending-links a .material-icons-outlined {
  font-size: 13px;
  color: var(--md-grey-400);
  flex-shrink: 0;
}

.learning-path__trending-links .learning-path__trending-score {
  margin-left: auto;
  font-size: 9px;
  font-weight: 600;
  color: var(--md-grey-400);
  flex-shrink: 0;
}

.learning-path__trending-loader {
  padding: 8px 0;
  font-size: 11px;
  color: var(--md-grey-400);
  display: flex;
  align-items: center;
  gap: 6px;
}

.learning-path__trending-loader::before {
  content: '';
  width: 12px;
  height: 12px;
  border: 2px solid var(--md-grey-200);
  border-top-color: var(--md-primary-400);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.learning-path__track-stage .learning-path__link {
  padding: 6px 0;
  font-size: 12px;
  gap: 6px;
}

.learning-path__track-stage .learning-path__link .material-icons-outlined {
  font-size: 14px;
}

/* ===== Mobile Scroll Indicator Dots ===== */
.learning-path__scroll-indicators {
  display: none;
  justify-content: center;
  gap: 8px;
  padding: 16px 0 4px;
}

.learning-path__scroll-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--md-grey-300);
  transition: background 0.2s ease, transform 0.2s ease;
}

.learning-path__scroll-dot.active {
  background: var(--md-primary-600);
  transform: scale(1.3);
}

/* ===== Learning Path — iPad Landscape / Small Desktop (900-1023px) ===== */
@media (min-width: 900px) and (max-width: 1023px) {
  .learning-path__tracks {
    gap: 12px;
  }

  .learning-path__track-header {
    padding: 16px 12px 12px;
    gap: 10px;
  }

  .learning-path__track-badge-ring {
    width: 42px;
    height: 42px;
  }

  .learning-path__track-badge-ring .material-icons-outlined {
    font-size: 20px;
  }

  .learning-path__track-title {
    font-size: 14px;
  }

  .learning-path__track-desc {
    font-size: 11px;
  }

  .learning-path__track-stage-content {
    padding: 10px 10px 10px 0;
  }

  .learning-path__track-stage-title {
    font-size: 12px;
  }

  .learning-path__track-stage .learning-path__link {
    font-size: 11px;
    padding: 5px 0;
  }

  .learning-path__track-stage-dot {
    width: 28px;
  }
}

/* ===== Learning Path — Tablet / iPad Portrait (600-899px) ===== */
@media (max-width: 899px) {
  .learning-path__tracks {
    grid-template-columns: repeat(3, 80vw);
    gap: 12px;
    padding-top: 0;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }

  .learning-path__tracks::-webkit-scrollbar {
    display: none;
  }

  .learning-path__track {
    scroll-snap-align: start;
  }

  .learning-path__tracks::before,
  .learning-path__tracks::after {
    display: none;
  }

  .learning-path__track-header {
    gap: 14px;
  }

  .learning-path__scroll-indicators {
    display: flex;
  }
}

/* ===== Learning Path — Mobile ===== */
@media (max-width: 600px) {
  .learning-path {
    padding-bottom: 24px;
  }

  .learning-path__hero {
    padding: 16px 14px 14px;
    margin-bottom: 16px;
  }

  .learning-path__hero-content {
    gap: 10px;
  }

  .learning-path__hero-icon {
    font-size: 28px;
  }

  .learning-path__hero-title {
    font-size: 17px;
  }

  .learning-path__hero-subtitle {
    font-size: 12px;
  }

  .learning-path__hero-meta {
    gap: 12px;
  }

  .learning-path__section-heading {
    font-size: 11px;
    margin-bottom: 10px;
  }

  /* Foundation: stack vertically on mobile */
  .learning-path__foundation {
    flex-direction: column;
    gap: 0;
  }

  .learning-path__foundation-card {
    padding: 14px;
  }

  .learning-path__foundation-arrow {
    padding: 4px 0;
    justify-content: center;
  }

  .learning-path__foundation-arrow .material-icons-outlined {
    font-size: 20px;
    transform: rotate(90deg);
  }

  .learning-path__foundation-title {
    font-size: 14px;
  }

  .learning-path__foundation-num {
    width: 26px;
    height: 26px;
    font-size: 13px;
    margin-bottom: 8px;
  }

  .learning-path__link {
    font-size: 12px;
    padding: 7px 0;
    gap: 6px;
  }

  .learning-path__link .material-icons-outlined {
    font-size: 13px;
  }

  .learning-path__cost {
    font-size: 9px;
    padding: 1px 6px;
  }

  .learning-path__fork {
    font-size: 11px;
    padding: 12px 0 4px;
    margin: 8px 0 12px;
  }

  .learning-path__controls {
    padding: 0 4px 8px;
  }

  .learning-path__expand-all {
    font-size: 12px;
  }

  /* Tracks: narrow scroll cards on mobile */
  .learning-path__tracks {
    grid-template-columns: repeat(3, 84vw);
    gap: 10px;
  }

  /* Badge compact on mobile */
  .learning-path__track-badge-ring {
    width: 40px;
    height: 40px;
  }

  .learning-path__track-badge-ring .material-icons-outlined {
    font-size: 20px;
  }

  .learning-path__track-header {
    padding: 14px;
    gap: 12px;
  }

  .learning-path__track-title {
    font-size: 15px;
  }

  .learning-path__track-desc {
    display: none;
  }

  .learning-path__track-stage-dot {
    width: 28px;
  }

  .learning-path__track-stage-content {
    padding: 10px 12px 10px 0;
  }

  .learning-path__track-stage-title {
    font-size: 13px;
  }

  .learning-path__track-stage .learning-path__link {
    font-size: 11px;
    padding: 5px 0;
  }

  .learning-path__trending-toggle {
    font-size: 9px;
    padding: 3px 8px;
  }

  .learning-path__scroll-indicators {
    padding: 12px 0 0;
  }
}

/* ============================================================
   AI Atlas — Concept Knowledge Search
   ============================================================ */
.ai-atlas {
  max-width: 900px;
  margin: 0 auto;
  padding-bottom: 48px;
}

/* ===== Search Hero ===== */
.ai-atlas__hero {
  text-align: center;
  padding: 32px 24px 28px;
  background: var(--md-surface);
  border: 1px solid var(--md-grey-200);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.ai-atlas__hero-icon {
  font-size: 36px;
  color: var(--md-primary-600);
  margin-bottom: 6px;
}

.ai-atlas__hero-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: var(--md-grey-900);
  margin-bottom: 4px;
}

.ai-atlas__hero-subtitle {
  font-size: 13px;
  color: var(--md-grey-500);
  margin-bottom: 20px;
  line-height: 1.5;
}

.ai-atlas__search-wrapper {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}

.ai-atlas__search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: var(--md-grey-400);
  z-index: 1;
  pointer-events: none;
}

.ai-atlas__search {
  width: 100%;
  padding: 14px 20px 14px 48px;
  font-size: 16px;
  font-family: var(--font-body);
  color: var(--md-grey-900);
  background: var(--md-surface);
  border: 2px solid var(--md-grey-200);
  border-radius: 28px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  box-sizing: border-box;
}

.ai-atlas__search:focus {
  border-color: var(--md-primary-400);
  box-shadow: 0 0 0 4px rgba(66, 133, 244, 0.15);
}

.ai-atlas__search::placeholder {
  color: var(--md-grey-400);
}

/* ===== Autocomplete Dropdown ===== */
.ai-atlas__autocomplete {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-3, 0 4px 20px rgba(0,0,0,0.15));
  z-index: 100;
  overflow: hidden;
  max-height: 380px;
  overflow-y: auto;
}

.ai-atlas__ac-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--md-grey-100);
  cursor: pointer;
  transition: background 0.1s ease;
}

.ai-atlas__ac-item:last-child { border-bottom: none; }
.ai-atlas__ac-item:hover,
.ai-atlas__ac-item.selected {
  background: var(--md-primary-50);
}

.ai-atlas__ac-item .material-icons-outlined {
  font-size: 20px;
  color: var(--md-primary-600);
  flex-shrink: 0;
}

.ai-atlas__ac-name {
  flex: 1;
  color: var(--md-grey-900);
  font-weight: 400;
}

.ai-atlas__ac-name strong {
  font-weight: 600;
  color: var(--md-primary-700);
}

.ai-atlas__ac-cat {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--md-grey-500);
  padding: 2px 8px;
  background: var(--md-grey-100);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.ai-atlas__ac-empty {
  padding: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--md-grey-500);
}

/* ===== Popular Section ===== */
.ai-atlas__section-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--md-grey-700);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
}

.ai-atlas__section-title .material-icons-outlined {
  font-size: 18px;
  color: var(--md-primary-600);
}

.ai-atlas__categories {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.ai-atlas__cat-chip {
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--md-grey-700);
  background: var(--md-grey-100);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.15s ease;
}

.ai-atlas__cat-chip:hover { background: var(--md-grey-200); }
.ai-atlas__cat-chip.active {
  background: var(--md-primary-50);
  color: var(--md-primary-700);
  border-color: var(--md-primary-200, #B4D0F5);
}

.ai-atlas__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-atlas__chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 400;
  color: var(--md-grey-800);
  background: var(--md-surface);
  border: 1px solid var(--md-grey-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.ai-atlas__chip:hover {
  border-color: var(--md-primary-300);
  box-shadow: var(--elevation-1);
  transform: translateY(-1px);
}

.ai-atlas__chip .material-icons-outlined {
  font-size: 16px;
  color: var(--md-primary-600);
}

/* ===== Concept Detail Card ===== */
.ai-atlas__back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--md-primary-700);
  background: none;
  border: 1px solid var(--md-primary-200, #B4D0F5);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.15s ease;
}

.ai-atlas__back:hover {
  background: var(--md-primary-50);
}

.ai-atlas__back .material-icons-outlined { font-size: 16px; }

.ai-atlas__card {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-2);
  overflow: hidden;
}

.ai-atlas__card-header {
  padding: 28px 28px 24px;
  border-left: 4px solid var(--md-primary-600);
  background: var(--md-grey-50);
}

.ai-atlas__card-cat {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 10px;
}

.ai-atlas__card-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 500;
  color: var(--md-grey-900);
  margin-bottom: 8px;
}

.ai-atlas__card-summary {
  font-size: 15px;
  color: var(--md-grey-700);
  line-height: 1.6;
}

.ai-atlas__card-body {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0;
}

.ai-atlas__card-main {
  padding: 24px 28px;
}

.ai-atlas__card-sidebar {
  padding: 24px 28px;
  background: var(--md-grey-50);
  border-left: 1px solid var(--md-grey-100);
}

.ai-atlas__section {
  margin-bottom: 24px;
}

.ai-atlas__section:last-child { margin-bottom: 0; }

.ai-atlas__section h3 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--md-grey-800);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--md-grey-100);
}

.ai-atlas__section h3 .material-icons-outlined {
  font-size: 18px;
  color: var(--md-primary-600);
}

.ai-atlas__explanation {
  font-size: 14px;
  line-height: 1.75;
  color: var(--md-grey-800);
}

.ai-atlas__explanation p {
  margin-bottom: 12px;
}

.ai-atlas__explanation p:last-child { margin-bottom: 0; }

.ai-atlas__card-sidebar h4 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--md-grey-800);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
}

.ai-atlas__card-sidebar h4 .material-icons-outlined {
  font-size: 16px;
  color: var(--md-primary-600);
}

.ai-atlas__key-points {
  list-style: none;
  padding: 0;
}

.ai-atlas__key-points li {
  position: relative;
  padding: 8px 0 8px 20px;
  font-size: 13px;
  color: var(--md-grey-700);
  line-height: 1.5;
  border-bottom: 1px solid var(--md-grey-100);
}

.ai-atlas__key-points li:last-child { border-bottom: none; }

.ai-atlas__key-points li::before {
  content: 'check_circle';
  font-family: 'Material Icons Outlined';
  font-size: 14px;
  color: var(--md-green-600);
  position: absolute;
  left: 0;
  top: 9px;
  -webkit-font-feature-settings: 'liga';
  font-feature-settings: 'liga';
}

/* Key Concepts Glossary */
.ai-atlas__glossary {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ai-atlas__glossary dt {
  font-size: 13px;
  font-weight: 600;
  color: var(--md-primary-700);
  padding: 10px 0 2px;
  border-top: 1px solid var(--md-grey-100);
}

.ai-atlas__glossary dt:first-child {
  border-top: none;
  padding-top: 0;
}

.ai-atlas__glossary dd {
  font-size: 13px;
  color: var(--md-grey-700);
  line-height: 1.5;
  padding-bottom: 4px;
  margin: 0;
}

/* Reference links */
.ai-atlas__refs {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ai-atlas__ref-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  font-size: 13px;
  color: var(--md-primary-700);
  text-decoration: none;
  border-bottom: 1px solid var(--md-grey-100);
  transition: color 0.15s ease;
}

.ai-atlas__ref-link:last-child { border-bottom: none; }
.ai-atlas__ref-link:hover { color: var(--md-primary-800); }

.ai-atlas__ref-link .material-icons-outlined {
  font-size: 15px;
  color: var(--md-grey-400);
  flex-shrink: 0;
}

/* Related concept chips */
.ai-atlas__related {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ai-atlas__related-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  font-size: 12px;
  color: var(--md-primary-700);
  background: var(--md-primary-50);
  border: 1px solid var(--md-primary-100, #C2D9F7);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.15s ease;
}

.ai-atlas__related-chip:hover {
  background: var(--md-primary-100, #C2D9F7);
}

.ai-atlas__related-chip .material-icons-outlined {
  font-size: 14px;
}

/* ===== AI Atlas Key Notice (inline, subtle) ===== */
.ai-atlas__key-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--md-grey-500);
}

.ai-atlas__key-notice .material-icons-outlined {
  font-size: 15px;
  color: var(--md-grey-400);
}

.ai-atlas__key-notice-link {
  background: none;
  border: none;
  color: var(--md-primary-600);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
  font-family: var(--font-primary);
}

.ai-atlas__key-notice-link:hover {
  color: var(--md-primary-800);
}

/* ===== AI Atlas Setup Screen ===== */
.ai-atlas__setup {
  max-width: 520px;
  margin: 0 auto;
}

.ai-atlas__setup-card {
  background: var(--md-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--elevation-2);
  padding: 32px;
}

.ai-atlas__setup-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--md-grey-900);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.ai-atlas__setup-card h3 .material-icons-outlined {
  font-size: 22px;
  color: var(--md-primary-600);
}

.ai-atlas__setup-card > p {
  font-size: 13px;
  color: var(--md-grey-600);
  line-height: 1.6;
  margin-bottom: 20px;
}

.ai-atlas__setup-provider {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.ai-atlas__setup-provider label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border: 1px solid var(--md-grey-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.ai-atlas__setup-provider label:has(input:checked) {
  border-color: var(--md-primary-400);
  background: var(--md-primary-50);
}

.ai-atlas__setup-provider label span {
  font-size: 14px;
  font-weight: 500;
  color: var(--md-grey-800);
}

.ai-atlas__setup-provider label small {
  font-weight: 400;
  color: var(--md-grey-500);
}

.ai-atlas__setup-provider input[type="radio"] {
  accent-color: var(--md-primary-600);
}

.ai-atlas__setup-input {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.ai-atlas__setup-input input {
  flex: 1;
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--font-primary);
  color: var(--md-grey-900);
  background: var(--md-surface);
  border: 2px solid var(--md-grey-200);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s ease;
}

.ai-atlas__setup-input input:focus {
  border-color: var(--md-primary-400);
}

.ai-atlas__setup-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  color: white;
  background: var(--md-primary-600);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s ease;
  white-space: nowrap;
}

.ai-atlas__setup-btn:hover { background: var(--md-primary-700); }

.ai-atlas__setup-btn .material-icons-outlined { font-size: 18px; }

.ai-atlas__setup-note {
  display: block;
  font-size: 11px;
  color: var(--md-grey-400);
  line-height: 1.5;
}

/* ===== AI Atlas Loading & Streaming ===== */
.ai-atlas__card--loading .ai-atlas__card-header {
  border-left-color: var(--md-primary-400);
}

.ai-atlas__loading-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--md-primary-600);
  font-weight: 500;
}

@keyframes atlas-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.ai-atlas__loading-spin {
  font-size: 20px;
  animation: atlas-spin 2s linear infinite;
}

.ai-atlas__stream-preview {
  padding: 24px 28px;
  max-height: 300px;
  overflow-y: auto;
}

.ai-atlas__stream-content {
  font-size: 12px;
  font-family: 'Roboto Mono', monospace;
  color: var(--md-grey-500);
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  margin: 0;
}

/* ===== AI Atlas Error State ===== */
.ai-atlas__card--error { border-top: 3px solid var(--md-red-600); }

.ai-atlas__error {
  padding: 40px 28px;
  text-align: center;
}

.ai-atlas__error .material-icons-outlined {
  font-size: 48px;
  color: var(--md-red-600);
  margin-bottom: 12px;
}

.ai-atlas__error h3 {
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--md-grey-800);
  margin-bottom: 8px;
}

.ai-atlas__error p {
  font-size: 13px;
  color: var(--md-grey-600);
  max-width: 400px;
  margin: 0 auto 8px;
}

.ai-atlas__error-hint {
  color: var(--md-primary-600) !important;
  font-weight: 500;
}

.ai-atlas__retry-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--md-primary-700);
  background: var(--md-primary-50);
  border: 1px solid var(--md-primary-200, #B4D0F5);
  border-radius: var(--radius-full);
  cursor: pointer;
}

.ai-atlas__retry-btn:hover { background: var(--md-primary-100, #C2D9F7); }

/* ===== AI Atlas Settings Button ===== */
.ai-atlas__settings-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--md-surface);
  border: 1px solid var(--md-grey-200);
  box-shadow: var(--elevation-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow 0.2s ease;
  z-index: 50;
}

.ai-atlas__settings-btn:hover { box-shadow: var(--elevation-3); }
.ai-atlas__settings-btn .material-icons-outlined { font-size: 20px; color: var(--md-grey-600); }

/* ===== AI Atlas Chip Category Badge ===== */
.ai-atlas__chip-cat {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--md-grey-400);
  margin-left: 4px;
}

/* ===== AI Atlas Freeform Search Item ===== */
.ai-atlas__ac-freeform {
  background: linear-gradient(135deg, #F5F0FF 0%, #F0F4FF 100%);
  border-top: 1px solid var(--md-grey-200);
}

.ai-atlas__ac-freeform .material-icons-outlined {
  color: #7B1FA2;
}

/* ===== AI Atlas Responsive ===== */
@media (max-width: 768px) {
  .ai-atlas__hero {
    padding: 20px 16px 20px;
  }

  .ai-atlas__hero-title { font-size: 18px; }
  .ai-atlas__hero-subtitle { font-size: 12px; margin-bottom: 14px; }

  .ai-atlas__search {
    padding: 12px 16px 12px 42px;
    font-size: 14px;
  }

  .ai-atlas__search-icon { left: 14px; font-size: 18px; }

  .ai-atlas__card-body {
    grid-template-columns: 1fr;
  }

  .ai-atlas__card-sidebar {
    border-left: none;
    border-top: 1px solid var(--md-grey-100);
  }

  .ai-atlas__card-header { padding: 20px 16px 16px; }
  .ai-atlas__card-main { padding: 16px; }
  .ai-atlas__card-sidebar { padding: 16px; }
  .ai-atlas__card-title { font-size: 20px; }
  .ai-atlas__card-summary { font-size: 13px; }
  .ai-atlas__explanation { font-size: 13px; }

  .ai-atlas__settings-btn {
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
  }

  .ai-atlas__setup-card {
    padding: 20px;
  }

  .ai-atlas__back {
    font-size: 12px;
    padding: 5px 12px;
    margin-bottom: 12px;
  }

  .ai-atlas__section h3 {
    font-size: 13px;
  }

  .ai-atlas__ref-link {
    font-size: 12px;
    padding: 6px 0;
  }

  .ai-atlas__key-points li {
    font-size: 12px;
    padding: 6px 0 6px 18px;
  }
}

@media (max-width: 480px) {
  .ai-atlas__chips { gap: 6px; }
  .ai-atlas__chip { font-size: 11px; padding: 6px 10px; }

  .ai-atlas__hero {
    padding: 16px 12px 16px;
  }

  .ai-atlas__search {
    font-size: 14px;
    padding: 10px 12px 10px 38px;
    border-radius: 22px;
  }

  .ai-atlas__categories {
    gap: 4px;
    margin-bottom: 12px;
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .ai-atlas__categories::-webkit-scrollbar { display: none; }

  .ai-atlas__cat-chip {
    padding: 4px 10px;
    font-size: 11px;
    white-space: nowrap;
    flex-shrink: 0;
  }
}