:root {
  --bg: #eef2f6;
  --bg-soft: #f7f9fc;
  --surface: #ffffff;
  --ink: #1a2332;
  --muted: #5b6b7c;
  --line: #d7e0ea;
  --blue: #2f6fed;
  --blue-soft: #e8f0ff;
  --teal: #1f9d8a;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(26, 35, 50, 0.08);
  --font: "Source Sans 3", system-ui, sans-serif;
  --display: "Fraunces", Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 50% -10%, #dbe7ff 0%, transparent 60%),
    linear-gradient(180deg, #f4f7fb 0%, var(--bg) 40%, #e9eef5 100%);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, select, textarea, input { font: inherit; }

.skip-link {
  position: absolute; left: -999px; top: 0;
}
.skip-link:focus { left: 1rem; top: 1rem; z-index: 50; background: #fff; padding: .5rem .75rem; }

.container { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }

.navbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(10px);
  background: rgba(244, 247, 251, 0.86);
  border-bottom: 1px solid rgba(215, 224, 234, 0.8);
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px; gap: 1rem;
}
.navbar-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  line-height: 1.15;
  text-decoration: none;
}
.footer-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  font-weight: 700;
}
.brand-mark {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.brand-mark__learn {
  color: #e85d04;
}
.brand-mark__product {
  font-weight: 700;
  color: var(--ink);
}
.brand-stack {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  padding-left: 0.05rem;
}
.brand-powered,
.brand-love {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.01em;
}
.brand-powered a {
  text-decoration: underline;
  text-underline-offset: 2px;
}
.brand-love {
  color: #64748b;
}
.brand-love--footer {
  font-weight: 500;
  font-size: 0.8rem;
}
.brand-icon { font-size: 1.15rem; }
.navbar-links { display: flex; align-items: center; gap: .5rem; }
.nav-link {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .55rem .85rem; border-radius: 999px;
  color: var(--muted); font-weight: 600; font-size: .92rem;
}
.nav-link.active, .nav-link:hover {
  background: var(--blue-soft); color: var(--blue);
}

.lang-selector { position: relative; }
.lang-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  border: 1px solid var(--line); background: #fff;
  border-radius: 999px; padding: .45rem .75rem; cursor: pointer;
}
.lang-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + .4rem);
  list-style: none; margin: 0; padding: .4rem;
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); min-width: 180px; z-index: 50;
}
.lang-dropdown.open { display: block; }
.lang-option {
  width: 100%; border: 0; background: transparent; text-align: left;
  padding: .55rem .65rem; border-radius: 10px; cursor: pointer;
  display: flex; gap: .5rem; align-items: center;
}
.lang-option.active, .lang-option:hover { background: var(--blue-soft); }

.hero-section { padding: 2.4rem 0 3.5rem; }
.hero-content { text-align: center; margin-bottom: 1.4rem; }
.hero-badge {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--blue-soft); color: var(--blue);
  border-radius: 999px; padding: .4rem .85rem;
  font-size: .88rem; font-weight: 600; margin-bottom: .9rem;
}
.hero-title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  letter-spacing: -0.02em;
}
.hero-subtitle {
  margin: .7rem auto 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.chat-input-area {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 1rem;
}
.search-input-wrapper { position: relative; }
.search-input {
  width: 100%;
  border: 0;
  resize: none;
  min-height: 88px;
  padding: .85rem 1rem 3.2rem;
  border-radius: 16px;
  background: var(--bg-soft);
  color: var(--ink);
  outline: none;
}
.search-actions {
  position: absolute; right: .75rem; bottom: .75rem;
}
.btn {
  border: 0; border-radius: 999px; cursor: pointer;
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .65rem 1.05rem; font-weight: 700;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { filter: brightness(1.05); }

.search-filters {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
  margin-top: .9rem;
}
.filter-label {
  display: block;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: .35rem;
  font-weight: 700;
}
.filter-select, .filter-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: .65rem .75rem;
  background: #fff;
}

/* Sources hero */
.sources-hero {
  margin-top: 2rem;
  animation: rise .55s ease both;
}
.sources-hero-intro {
  text-align: center;
  margin-bottom: 1.1rem;
}
.sources-hero-title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
}
.sources-hero-sub {
  margin: .45rem auto 0;
  color: var(--muted);
  max-width: 36rem;
}
.sources-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.source-card-manual {
  position: absolute;
  left: .75rem;
  top: .75rem;
  padding: .25rem .55rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.92);
  color: #475569;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.source-card--manual {
  border-style: dashed;
}
@media (min-width: 1100px) {
  .sources-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  /* Esencia: Moodle Academy · Courses · MoodleNet siempre en 3 columnas */
  .sources-grid--core3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.source-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.source-card--brand {
  border-color: rgba(15, 23, 42, 0.08);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
}
.source-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(26, 35, 50, 0.12);
}
.source-card-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, #0f172a, #1e3a5f);
  position: relative;
}
.source-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .45s ease;
}
.source-card:hover .source-card-media img { transform: scale(1.03); }
.source-card-body {
  padding: 1rem 1.05rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: .45rem;
  flex: 1;
}
.source-card-eyebrow {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 700;
}
.source-card-body h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.2rem;
}
.source-card-body p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
  flex: 1;
}
.source-card-cta {
  align-self: flex-start;
  margin-top: .35rem;
  border: 1px solid var(--line);
  background: var(--blue-soft);
  color: var(--blue);
  border-radius: 999px;
  padding: .5rem .9rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
}
.source-card-cta:hover { background: var(--blue); color: #fff; }
.source-card-count {
  position: absolute;
  top: .75rem;
  right: .75rem;
  min-width: 2.35rem;
  height: 2.35rem;
  padding: 0 .55rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.88);
  color: #fff;
  font-weight: 800;
  font-size: .9rem;
  letter-spacing: .02em;
  backdrop-filter: blur(6px);
  border: 2px solid rgba(255,255,255,0.35);
  box-shadow: 0 6px 16px rgba(0,0,0,.25);
  z-index: 2;
}
.source-card-total {
  margin: 0 !important;
  flex: 0 !important;
  font-size: .88rem;
  font-weight: 800;
  color: var(--ink) !important;
  letter-spacing: .01em;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.source-card-total::before {
  content: "";
  width: .55rem;
  height: .55rem;
  border-radius: 999px;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(31, 157, 138, 0.18);
}
.sources-grid--brand .source-card-body h3 {
  font-size: 1.28rem;
  letter-spacing: -0.01em;
}
.source-card--brand .source-card-media {
  background: #0f172a;
}

/* Source catalogue modal */
.source-modal[hidden] { display: none !important; }
.source-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.source-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
}
.source-modal__panel {
  position: relative;
  z-index: 1;
  width: min(920px, 100%);
  max-height: min(88vh, 900px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: #fff;
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.28);
}
.source-modal__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.2rem 0.85rem;
  border-bottom: 1px solid var(--line);
}
.source-modal__hero {
  display: flex;
  gap: .9rem;
  align-items: center;
  min-width: 0;
}
.source-modal__hero img {
  width: 120px;
  height: 68px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--line);
  flex-shrink: 0;
}
.source-modal__eyebrow {
  margin: 0;
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 700;
}
.source-modal__header h2 {
  margin: .15rem 0 0;
  font-family: var(--display);
  font-size: 1.45rem;
  line-height: 1.15;
}
.source-modal__count {
  margin: .25rem 0 0;
  color: var(--muted);
  font-weight: 600;
  font-size: .92rem;
}
.source-modal__close {
  border: 1px solid var(--line);
  background: #fff;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--ink);
  flex-shrink: 0;
}
.source-modal__close:hover { background: var(--blue-soft); color: var(--blue); }
.source-modal__hint {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .85rem 1.2rem;
  background: linear-gradient(90deg, #eef5ff, #f7fbff);
  border-bottom: 1px solid var(--line);
}
.source-modal__hint p {
  margin: 0;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.4;
  max-width: 36rem;
}
.source-modal__body {
  overflow: auto;
  padding: .85rem 1.1rem 1.2rem;
  display: grid;
  gap: .7rem;
}
.source-modal__loading,
.source-modal__empty {
  margin: 1.5rem auto;
  text-align: center;
  color: var(--muted);
}
.source-modal-item {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: .95rem;
  align-items: center;
  padding: .75rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.source-modal-item:hover {
  border-color: #b9d0ef;
  box-shadow: 0 8px 20px rgba(26, 35, 50, 0.06);
}
.source-modal-item img,
.source-modal-thumb {
  width: 200px;
  height: 112px;
  object-fit: cover;
  border-radius: 12px;
  background: #e8eef6;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
  transition: opacity .45s ease, filter .45s ease, transform .45s ease;
}
.source-modal-thumb.is-rotating {
  opacity: .55;
  filter: saturate(1.15) contrast(1.05);
  transform: scale(1.02);
}
.source-modal-item h3 {
  margin: 0 0 .2rem;
  font-size: 1rem;
  line-height: 1.25;
}
.source-modal-item p {
  margin: 0;
  color: var(--muted);
  font-size: .86rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.source-modal-item a {
  white-space: nowrap;
  font-weight: 700;
  color: var(--blue);
  text-decoration: none;
  padding: .45rem .7rem;
  border-radius: 999px;
  background: var(--blue-soft);
}
.source-modal-item a:hover { background: var(--blue); color: #fff; }

@media (max-width: 720px) {
  .source-modal-item {
    grid-template-columns: 140px 1fr;
  }
  .source-modal-item img,
  .source-modal-thumb {
    width: 140px;
    height: 84px;
  }
  .source-modal-item a {
    grid-column: 1 / -1;
    justify-self: start;
  }
  .source-modal__hero img { width: 84px; height: 48px; }
}

.examples-section { margin-top: 1.6rem; text-align: center; }
.examples-label { color: var(--muted); margin: 0 0 .75rem; font-weight: 600; }
.examples-chips {
  display: flex; flex-wrap: wrap; justify-content: center; gap: .55rem;
}
.example-chip {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: .55rem .9rem;
  cursor: pointer;
  color: var(--ink);
  font-weight: 600;
}
.example-chip:hover { border-color: var(--blue); color: var(--blue); }

.results-area { margin-top: 1.8rem; }
.results-welcome {
  text-align: center;
  color: var(--muted);
  padding: 1.5rem 1rem 0;
}
.results-welcome h2 {
  font-family: var(--display);
  color: var(--ink);
  margin: .4rem 0;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.result-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
}
.result-card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.result-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.result-meta {
  margin-top: .7rem;
  display: flex; flex-wrap: wrap; gap: .35rem;
}
.result-meta span {
  font-size: .72rem;
  background: var(--bg-soft);
  border-radius: 999px;
  padding: .25rem .55rem;
  color: var(--muted);
  font-weight: 700;
}
.result-card a {
  display: inline-block;
  margin-top: .8rem;
  color: var(--blue);
  font-weight: 700;
}

.loading-indicator {
  display: flex; align-items: center; justify-content: center; gap: .75rem;
  margin-top: 1.2rem; color: var(--muted);
}
.spinner-ring {
  width: 22px; height: 22px; border-radius: 50%;
  border: 3px solid #c9d7ea; border-top-color: var(--blue);
  animation: spin .8s linear infinite;
}

.navbar-links { display: flex; align-items: center; gap: .45rem; flex-wrap: wrap; justify-content: flex-end; }
.btn-nav { padding: .45rem .85rem; font-size: .85rem; text-decoration: none; }
.btn-ghost {
  background: #fff;
  color: var(--blue);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--blue); }
.lang-count {
  font-size: .65rem;
  font-weight: 800;
  background: var(--blue-soft);
  color: var(--blue);
  border-radius: 999px;
  padding: .1rem .4rem;
}
.lang-dropdown--wide {
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: min(360px, 92vw);
  max-height: 360px;
  overflow: auto;
}
.lang-dropdown--wide.open { display: grid; }

.hero-content--presearch { margin-bottom: 1.6rem; }

.platform-totals {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .65rem;
  margin-top: 1.35rem;
  margin-bottom: .25rem;
}
.platform-totals__item {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  padding: .7rem .75rem .65rem;
  display: flex;
  flex-direction: column;
  gap: .15rem;
  min-height: 4.2rem;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
}
.platform-totals__item strong {
  font-family: var(--display);
  font-size: 1.45rem;
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.platform-totals__item span {
  font-size: .72rem;
  line-height: 1.25;
  color: var(--muted);
  font-weight: 650;
}
.platform-totals__item--accent {
  background: linear-gradient(145deg, #e8f1ff, #f4f8ff);
  border-color: rgba(47, 111, 237, 0.2);
}
.platform-totals__item--accent strong { color: var(--blue); }
.platform-totals__item--ai {
  background: linear-gradient(145deg, #ecfdf5, #f0fdfa);
  border-color: rgba(15, 118, 110, 0.22);
  grid-column: span 2;
}
.platform-totals__item--ai strong { color: #0f766e; }
@media (max-width: 900px) {
  .platform-totals { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .platform-totals__item--ai { grid-column: span 2; }
}
@media (max-width: 520px) {
  .platform-totals { grid-template-columns: 1fr 1fr; }
}
.hero-kicker {
  margin: 0 0 .55rem;
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 800;
}
.hero-powered-line {
  margin: .85rem auto 0;
  max-width: 40rem;
  color: #3a5166;
  font-size: .95rem;
  line-height: 1.45;
}
.hero-cta-row {
  margin-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  justify-content: center;
}
.footer-powered {
  margin: .35rem 0 0;
  font-weight: 700;
}
.footer-powered a { color: var(--blue); }

.footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 5.5rem;
  margin-top: 1rem;
  background: rgba(255,255,255,0.45);
}
.footer-inner { text-align: center; }
.footer-mission, .footer-legal { color: var(--muted); }
.footer-legal--notice {
  max-width: 52rem;
  font-size: .82rem;
  line-height: 1.45;
  margin-top: .35rem;
  opacity: .92;
}
.footer-links {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem;
  margin: 1rem 0;
}
.footer-links a { color: var(--blue); font-weight: 600; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sources-hero-intro { position: relative; }
.mood-change-btn {
  margin-top: .65rem;
  border: 1px dashed var(--line);
  background: transparent;
  color: var(--blue);
  font-weight: 700;
  font-size: .85rem;
  border-radius: 999px;
  padding: .4rem .85rem;
  cursor: pointer;
}
.mood-change-btn:hover { background: var(--blue-soft); border-style: solid; }
.source-mood-img.is-painting {
  animation: moodSwap .7s ease;
}
@keyframes moodSwap {
  0% { opacity: .35; filter: saturate(.6) blur(2px); transform: scale(1.03); }
  100% { opacity: 1; filter: none; transform: scale(1); }
}

.mood-modal[hidden] { display: none !important; }
.mood-modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.mood-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 18, 32, 0.62);
  backdrop-filter: blur(6px);
}
.mood-modal__panel {
  position: relative;
  z-index: 1;
  width: min(560px, 100%);
  background: #fff;
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.3);
  padding: 1.35rem 1.35rem 1.2rem;
  animation: rise .35s ease;
}
.mood-modal__panel h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.55rem;
}
.mood-modal__sub {
  margin: .45rem 0 1rem;
  color: var(--muted);
  line-height: 1.45;
}
.mood-options {
  display: grid;
  gap: .55rem;
}
.mood-option {
  display: flex;
  align-items: center;
  gap: .7rem;
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  padding: .7rem .85rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
}
.mood-option:hover { border-color: #b9d0ef; background: #f7fbff; }
.mood-option.is-selected {
  border-color: var(--blue);
  background: var(--blue-soft);
  color: var(--blue);
  transform: translateY(-1px);
}
.mood-option__emoji { font-size: 1.25rem; }
.mood-modal__hint {
  margin: .75rem 0 0;
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.4;
  min-height: 2.4em;
}
.mood-modal__custom {
  display: block;
  margin-top: .85rem;
}
.mood-modal__custom input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: .7rem .85rem;
  font: inherit;
}
.mood-modal__custom input:focus {
  outline: 2px solid var(--blue-soft);
  border-color: var(--blue);
}
.mood-modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: 1rem;
}
.mood-modal__painting {
  margin: .85rem 0 0;
  font-weight: 700;
  color: var(--blue);
  text-align: center;
}

.result-card-media {
  position: relative;
  margin: -1rem -1rem .85rem;
  border-radius: 16px 16px 0 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #0f172a;
}
.result-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
  image-rendering: auto;
}
.result-card--rich .result-card-media {
  margin: 0 0 .85rem;
  border-radius: 12px;
}
.result-card-source {
  position: absolute;
  left: .65rem;
  bottom: .55rem;
  padding: .2rem .55rem;
  border-radius: 999px;
  background: rgba(0,0,0,.55);
  color: #fff;
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.course-counters {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: .55rem 0 .35rem;
}
.counter-chip {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .22rem .5rem;
  border-radius: 999px;
  background: #eef4fb;
  border: 1px solid #d5e3f3;
  font-size: .78rem;
  font-weight: 600;
  color: #123;
}
.counter-chip em {
  font-style: normal;
  opacity: .65;
  font-weight: 700;
  font-size: .7rem;
  text-transform: uppercase;
}
.badge-api, .badge-gen {
  font-size: .72rem;
  padding: .15rem .45rem;
  border-radius: 6px;
}
.badge-api { background: #dcfce7; color: #166534; }
.badge-gen { background: #e0e7ff; color: #3730a3; }
.source-card--masters { outline: 1px solid rgba(15, 118, 110, .28); }
.sources-hero--masters { margin-top: 2.25rem; }

/* OCAI Courses layer */
.ocai-banner {
  margin: 2rem 0 1.5rem;
  padding: 1.5rem 1.35rem;
  border-radius: 18px;
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(15, 108, 191, .18), transparent 55%),
    radial-gradient(100% 120% at 100% 20%, rgba(249, 128, 18, .16), transparent 50%),
    linear-gradient(160deg, #0b1526 0%, #122033 55%, #1a2332 100%);
  color: #f4f7fb;
  border: 1px solid rgba(255,255,255,.08);
}
.ocai-banner__eyebrow {
  margin: 0 0 .35rem;
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  opacity: .85;
}
.ocai-banner h2 {
  margin: 0 0 .5rem;
  font-family: Fraunces, Georgia, serif;
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
}
.ocai-banner p { margin: 0 0 .75rem; opacity: .92; max-width: 52rem; }
.ocai-banner__meta { font-size: .92rem; opacity: .8; }
.source-card--ocai { outline: 1px solid rgba(15, 108, 191, .25); }
.sources-hero--ocai { margin-top: 2.5rem; }
.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  align-items: center;
  margin-top: .75rem;
}
.btn-sm { padding: .4rem .75rem; font-size: .88rem; }
.ocai-stat {
  display: inline-flex;
  align-items: center;
  padding: .45rem .8rem;
  border-radius: 999px;
  background: rgba(15,108,191,.12);
  font-size: .9rem;
}
.ai-disclaimer {
  padding: .85rem 1rem;
  border-left: 3px solid var(--orange, #f98012);
  background: rgba(249, 128, 18, .08);
  border-radius: 0 12px 12px 0;
  font-size: .92rem;
}
.academic-card {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: .75rem;
  margin: 1.25rem 0 2rem;
}
.academic-card div {
  padding: .75rem .85rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.academic-card dt { font-size: .75rem; text-transform: uppercase; opacity: .65; margin: 0; }
.academic-card dd { margin: .2rem 0 0; font-weight: 600; }
.ai-unit {
  margin: 0 0 1.75rem;
  padding: 1.25rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.ai-unit h2 { margin-top: 0; font-family: Fraunces, Georgia, serif; }
.ai-unit-summary { font-weight: 600; margin-top: 1rem; }
.ai-quiz-item { margin: .75rem 0; padding: .65rem .75rem; background: #f7fafc; border-radius: 10px; }
.muted { opacity: .7; }
.ocai-recent-list { list-style: none; padding: 0; }
.ocai-recent-list li { padding: .45rem 0; border-bottom: 1px solid var(--line); }
.tutor-starters { display: grid; gap: .45rem; padding-left: 1.1rem; }

@media (max-width: 900px) {
  .search-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sources-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-label { display: none; }
  .lang-name-desktop { display: none; }
  .search-filters { grid-template-columns: 1fr; }
  .btn-nav .nav-label { display: none; }
}