:root {
  --ink: #12212b;
  --muted: #5d6972;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --line: #dfe5e6;
  --teal: #16756b;
  --teal-dark: #0f4f49;
  --amber: #d68135;
  --blue: #2f5f98;
  --green: #5b7d3a;
  --rose: #b4535b;
  --shadow: 0 18px 48px rgba(18, 33, 43, 0.12);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

.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;
}

.icon {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  stroke-width: 2.2;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -64px;
  z-index: 20;
  padding: 10px 14px;
  background: var(--ink);
  color: #fff;
  border-radius: 6px;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 250, 247, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.nav-shell,
.section-inner,
.footer-grid,
.footer-bottom {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.nav-shell {
  display: grid;
  grid-template-columns: max-content minmax(300px, 1fr) max-content;
  align-items: center;
  gap: 18px;
  min-width: 0;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand span:last-child {
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  font-size: 14px;
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
  min-width: 0;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 10px 12px;
  border-radius: 8px;
  color: #2d3d48;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links .icon {
  width: 17px;
  height: 17px;
  color: var(--teal-dark);
}

.nav-links a:hover,
.nav-links a:focus {
  background: #eef5f4;
  color: var(--teal-dark);
}

.site-search {
  position: relative;
  min-width: 0;
}

.site-search-control {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 50px;
  border: 1px solid #cadad7;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(18, 33, 43, 0.07);
}

.site-search-icon {
  width: 20px;
  height: 20px;
  margin-left: 14px;
  color: var(--teal-dark);
}

.site-search input {
  min-height: 48px;
  padding: 10px 52px 10px 10px;
  border: 0;
  background: transparent;
  font-size: 16px;
  font-weight: 650;
}

.site-search input:focus {
  outline: none;
  border-color: transparent;
}

.site-search-control:focus-within {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(22, 117, 107, 0.16), 0 12px 30px rgba(18, 33, 43, 0.1);
}

.site-search-submit {
  position: absolute;
  right: 6px;
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--teal);
  cursor: pointer;
}

.site-search-submit:hover,
.site-search-submit:focus {
  background: var(--teal-dark);
}

.site-search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 30;
  overflow: hidden;
  border: 1px solid #cadad7;
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.search-results-head {
  padding: 10px 12px;
  color: var(--teal-dark);
  background: #eef5f4;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.search-result {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 10px;
  padding: 12px;
  border-top: 1px solid #edf2f1;
  color: var(--ink);
  text-decoration: none;
}

.search-result:hover,
.search-result:focus,
.search-result.is-active {
  background: #f3faf8;
}

.search-result-main {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.search-result-title {
  font-size: 15px;
  font-weight: 900;
}

.search-result-summary {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.search-result-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.search-result-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 3px 7px;
  border: 1px solid #dbe6e3;
  border-radius: 999px;
  color: #38505b;
  background: #f8fbfa;
  font-size: 11px;
  font-weight: 800;
}

.search-result-tags .closed {
  color: #7a1d28;
  background: #fde9ec;
  border-color: #f6cbd2;
}

.search-empty {
  padding: 14px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.search-all-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 42px;
  padding: 11px 12px;
  border-top: 1px solid #edf2f1;
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 900;
  text-decoration: none;
}

.search-all-link:hover,
.search-all-link:focus {
  background: #eef5f4;
}

.hero {
  position: relative;
  min-height: 72vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  background-image:
    linear-gradient(90deg, rgba(251, 250, 247, 0.96) 0%, rgba(251, 250, 247, 0.84) 38%, rgba(251, 250, 247, 0.16) 70%),
    url("/assets/online-tutoring-hero.jpg");
  background-position: center;
  background-size: cover;
  border-bottom: 1px solid var(--line);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 120px;
  background: linear-gradient(180deg, rgba(251, 250, 247, 0), var(--paper));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(720px, calc(100% - 32px));
  margin-left: max(16px, calc((100vw - var(--max)) / 2));
  padding: 74px 0 94px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--amber);
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 690px;
  margin: 0;
  color: var(--ink);
  font-size: 64px;
  line-height: 1.02;
  letter-spacing: 0;
}

.hero p {
  max-width: 640px;
  margin: 22px 0 0;
  color: #31424e;
  font-size: 20px;
  line-height: 1.6;
}

.hero-actions,
.section-actions,
.filter-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button,
button.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #fff;
  background: var(--teal);
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.button:hover,
.button:focus {
  background: var(--teal-dark);
}

.button.secondary {
  color: var(--ink);
  border-color: #c9d8d6;
  background: rgba(255, 255, 255, 0.88);
}

.button.secondary:hover,
.button.secondary:focus {
  background: #eef5f4;
}

.metric-strip {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: min(var(--max), calc(100% - 32px));
  margin: -48px auto 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  background: var(--line);
}

.metric {
  min-height: 112px;
  padding: 22px;
  background: var(--panel);
}

.metric strong {
  display: block;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.1;
}

.metric span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.section {
  padding: 72px 0;
}

.section.alt {
  background: #eef4f2;
  border-block: 1px solid #dce7e3;
}

.section.compact {
  padding: 44px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  color: #52636d;
  font-size: 14px;
  font-weight: 800;
}

.breadcrumb a {
  color: var(--teal-dark);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus {
  text-decoration: underline;
}

.breadcrumb span::before {
  content: "/";
  margin-right: 8px;
  color: #9aa8ad;
}

.section h2,
.page-title h1,
.article h2 {
  margin: 0;
  color: var(--ink);
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: 0;
}

.section-head p,
.page-title p,
.article p {
  max-width: 780px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid > *,
.filter-bar > *,
.media-feature > *,
.directory-media > *,
.detail-layout > * {
  min-width: 0;
}

.grid.cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.platform-card,
.insight-card,
.compare-panel,
.source-block {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 10px 30px rgba(18, 33, 43, 0.06);
}

.platform-card {
  display: flex;
  flex-direction: column;
  min-height: 360px;
  padding: 20px;
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  min-width: 0;
  min-height: 48px;
}

.platform-card h3 {
  margin: 0;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0;
}

.platform-title,
.platform-heading,
.compare-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.platform-title {
  flex: 1 1 auto;
}

.platform-title h3,
.platform-heading h1 {
  min-width: 0;
}

.platform-favicon {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border: 1px solid #d7e3e1;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 5px 16px rgba(18, 33, 43, 0.08);
}

.platform-favicon.large {
  width: 48px;
  height: 48px;
  border-radius: 10px;
}

.platform-card h3 a {
  color: var(--ink);
  text-decoration: none;
}

.platform-card h3 a:hover,
.platform-card h3 a:focus {
  color: var(--teal-dark);
  text-decoration: underline;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  max-width: 170px;
  padding: 5px 9px;
  border-radius: 999px;
  color: var(--teal-dark);
  background: #e6f3ef;
  font-size: 12px;
  font-weight: 900;
  text-align: center;
  white-space: normal;
  overflow-wrap: anywhere;
}

.badge.warn {
  color: #7b3d17;
  background: #fff1df;
}

.badge.closed {
  color: #7a1d28;
  background: #fde9ec;
}

.platform-card p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 28px;
  padding: 5px 9px;
  border: 1px solid #dbe6e3;
  border-radius: 999px;
  color: #38505b;
  background: #f7faf9;
  font-size: 12px;
  font-weight: 800;
}

.detail-link-tags {
  margin: 0;
}

.tag-list li:hover,
.tag-list li:focus-within {
  border-color: #9ec8c0;
  background: #f3faf8;
}

.tag-list a,
.tag a {
  display: inline-flex;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.tag-list .icon,
.tag .icon {
  width: 13px;
  height: 13px;
  color: var(--teal-dark);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 18px;
}

.card-links {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.text-link {
  color: var(--teal-dark);
  font-weight: 900;
  text-decoration: none;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.icon-link .icon {
  width: 15px;
  height: 15px;
}

.text-link:hover,
.text-link:focus {
  text-decoration: underline;
}

.list-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.compact-list-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.content-list-card {
  min-width: 0;
}

.content-list-card a {
  display: flex;
  flex-direction: column;
  min-height: 218px;
  height: 100%;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  box-shadow: 0 10px 30px rgba(18, 33, 43, 0.06);
  text-decoration: none;
}

.content-list-card a:hover,
.content-list-card a:focus {
  border-color: #9ec8c0;
  background: #f7fbfa;
}

.list-card-kicker,
.list-card-meta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.list-card-kicker .icon,
.list-card-meta .icon {
  width: 15px;
  height: 15px;
}

.content-list-card h3 {
  margin: 12px 0 0;
  font-size: 21px;
  line-height: 1.2;
  letter-spacing: 0;
}

.content-list-card p {
  margin: 10px 0 18px;
  color: var(--muted);
  line-height: 1.55;
}

.list-card-meta {
  margin-top: auto;
  justify-content: space-between;
  color: #41535d;
  text-transform: none;
}

.category-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.category-tile {
  min-height: 122px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--panel);
  text-decoration: none;
}

.category-tile:hover,
.category-tile:focus {
  border-color: #9ec8c0;
  box-shadow: 0 10px 28px rgba(22, 117, 107, 0.1);
}

.category-tile strong {
  display: block;
  font-size: 18px;
}

.category-tile span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.image-tile {
  overflow: hidden;
  padding: 0;
}

.image-tile img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.image-tile strong,
.image-tile span {
  margin-inline: 18px;
}

.image-tile strong {
  margin-top: 16px;
}

.image-tile span {
  margin-bottom: 18px;
}

.media-feature,
.directory-media {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 28px;
  align-items: center;
}

.media-feature img,
.directory-media img,
.article-hero-image,
.detail-hero-image {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.media-feature img,
.directory-media img {
  aspect-ratio: 16 / 9;
}

.directory-media {
  margin-bottom: 24px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.compare-media img {
  aspect-ratio: 21 / 9;
}

.page-title {
  padding: 58px 0 34px;
  background: linear-gradient(180deg, #eef4f2, var(--paper));
  border-bottom: 1px solid var(--line);
}

.page-title .section-inner {
  max-width: var(--max);
}

.filter-bar {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, minmax(140px, 0.7fr)) auto;
  gap: 10px;
  align-items: end;
  margin: 0 0 24px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.field label {
  display: block;
  margin: 0 0 6px;
  color: #374854;
  font-size: 13px;
  font-weight: 900;
}

input,
select {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid #cfdada;
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font: inherit;
}

input:focus,
select:focus {
  outline: 3px solid rgba(22, 117, 107, 0.18);
  border-color: var(--teal);
}

.result-count {
  margin: 0 0 18px;
  color: var(--muted);
  font-weight: 700;
}

.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
}

.detail-panel {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.detail-panel h1 {
  margin: 0;
  font-size: 44px;
  line-height: 1.08;
}

.detail-panel p {
  color: var(--muted);
  line-height: 1.7;
}

.detail-hero-image {
  aspect-ratio: 16 / 9;
  margin-bottom: 20px;
}

.long-description {
  margin-top: 22px;
}

.long-description p {
  margin: 0 0 16px;
  color: #394b55;
  font-size: 17px;
}

.detail-list {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
}

.detail-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.detail-row strong {
  color: #354650;
}

.detail-row span,
.detail-row div {
  color: var(--muted);
  line-height: 1.55;
}

.side-panel {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  position: sticky;
  top: 96px;
}

.side-panel h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.platform-breakdown {
  display: grid;
  gap: 14px;
  padding: 16px;
  max-height: calc(100vh - 118px);
  overflow: auto;
}

.sidebar-section {
  padding: 14px;
  border: 1px solid #dfe8e6;
  border-radius: 8px;
  background: #fbfdfc;
}

.sidebar-section h3 {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.2;
  text-transform: uppercase;
}

.sidebar-section h3 .icon {
  width: 16px;
  height: 16px;
  color: var(--teal-dark);
}

.sidebar-platform-summary {
  background: #eef5f4;
}

.sidebar-platform-title {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.sidebar-platform-title h2 {
  margin: 0 0 6px;
  font-size: 20px;
  line-height: 1.15;
}

.sidebar-platform-summary p,
.sidebar-muted {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.sidebar-nav {
  display: grid;
  gap: 7px;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 7px 8px;
  border-radius: 8px;
  color: #2d3d48;
  font-size: 14px;
  font-weight: 850;
  text-decoration: none;
}

.sidebar-nav a:hover,
.sidebar-nav a:focus {
  color: var(--teal-dark);
  background: #eef5f4;
}

.sidebar-nav .icon {
  width: 15px;
  height: 15px;
  color: var(--teal-dark);
}

.fact-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.fact-list div {
  display: grid;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px solid #e3ecea;
}

.fact-list div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.fact-list dt {
  color: #374854;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.fact-list dd {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.fact-link {
  color: var(--teal-dark);
  font-weight: 850;
  text-decoration: none;
}

.fact-link:hover,
.fact-link:focus {
  text-decoration: underline;
}

.inline-link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.inline-link-list a {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 7px;
  border: 1px solid #dbe6e3;
  border-radius: 999px;
  color: var(--teal-dark);
  background: #f7faf9;
  font-size: 12px;
  font-weight: 850;
  text-decoration: none;
}

.inline-link-list a:hover,
.inline-link-list a:focus {
  border-color: #9ec8c0;
  background: #eef7f5;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sidebar-check-list,
.source-domain-list,
.mini-platform-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sidebar-check-list li {
  position: relative;
  padding-left: 20px;
  color: #42535d;
  font-size: 13px;
  line-height: 1.45;
}

.sidebar-check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--teal);
}

.plain-list a,
.checked-list a,
.sidebar-check-list a {
  color: inherit;
  font-weight: 850;
  text-decoration: none;
}

.plain-list a:hover,
.plain-list a:focus,
.checked-list a:hover,
.checked-list a:focus,
.sidebar-check-list a:hover,
.sidebar-check-list a:focus {
  color: var(--teal-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sidebar-tags li,
.source-domain-list li {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 26px;
  padding: 5px 8px;
  border: 1px solid #dbe6e3;
  border-radius: 999px;
  color: #38505b;
  background: #fff;
  font-size: 12px;
  font-weight: 850;
}

.sidebar-tags li:hover,
.sidebar-tags li:focus-within,
.source-domain-list li:hover,
.source-domain-list li:focus-within {
  border-color: #9ec8c0;
  background: #f3faf8;
}

.sidebar-tags a,
.source-domain-list a {
  display: inline-flex;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.mini-platform {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 8px;
  border: 1px solid #e3ecea;
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  text-decoration: none;
}

.mini-platform:hover,
.mini-platform:focus {
  border-color: #9ec8c0;
  background: #f3faf8;
}

.mini-platform strong,
.mini-platform small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-platform strong {
  font-size: 13px;
}

.mini-platform small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 750;
}

.sidebar-button {
  width: 100%;
  margin-top: 12px;
}

.source-details {
  margin-top: 12px;
}

.source-details summary {
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 900;
  cursor: pointer;
}

.source-details .source-list {
  margin-top: 10px;
}

.source-details .source-list a {
  font-size: 12px;
}

.sidebar-back {
  background: #fff;
}

.source-list,
.plain-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-block {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(18, 33, 43, 0.06);
}

.guide-block h3 {
  margin: 0;
  font-size: 21px;
}

.guide-block p {
  margin: 10px 0 16px;
  color: var(--muted);
  line-height: 1.65;
}

.checked-list li {
  position: relative;
  padding-left: 24px;
  color: #42535d;
  line-height: 1.55;
}

.checked-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--teal);
}

.source-list a {
  color: var(--teal-dark);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.article {
  max-width: 860px;
}

.article-hero-image {
  aspect-ratio: 16 / 9;
  margin-bottom: 28px;
}

.article h2 {
  margin-top: 40px;
  font-size: 30px;
}

.article h3 {
  margin: 28px 0 8px;
  font-size: 22px;
}

.article ul {
  margin: 14px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
}

.ranking-list {
  display: grid;
  gap: 14px;
  margin: 26px 0;
}

.rank-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.rank-number {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--blue);
  font-weight: 900;
}

.rank-item h3 {
  margin: 0;
}

.rank-item p {
  margin-top: 8px;
}

.list-detail-panel h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: 0;
}

.list-intro {
  margin: 24px 0 8px;
}

.list-intro p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.list-ranking {
  margin-bottom: 0;
}

.list-rank-item {
  align-items: start;
}

.rank-content {
  min-width: 0;
}

.list-rank-heading {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.list-rank-heading h3 {
  margin: 0 0 6px;
  font-size: 22px;
}

.rank-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.related-list-links {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-list-links a {
  display: flex;
  min-height: 38px;
  align-items: center;
  padding: 9px 10px;
  border: 1px solid #e3ecea;
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font-size: 13px;
  font-weight: 850;
  text-decoration: none;
}

.related-list-links a:hover,
.related-list-links a:focus {
  border-color: #9ec8c0;
  color: var(--teal-dark);
  background: #f3faf8;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.compare-table .platform-favicon {
  width: 28px;
  height: 28px;
}

.compare-table th,
.compare-table td {
  padding: 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.5;
}

.compare-table th {
  color: var(--ink);
  background: #edf5f3;
  font-size: 14px;
}

.compare-table td {
  color: var(--muted);
}

.section-actions.tight {
  margin-top: 10px;
}

.source-block {
  padding: 18px;
}

.source-block h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.source-block a {
  color: var(--teal-dark);
  overflow-wrap: anywhere;
}

.empty-state {
  padding: 32px;
  border: 1px dashed #b7c9c6;
  border-radius: 8px;
  background: #f7fbfa;
  color: var(--muted);
}

.site-footer {
  padding: 48px 0 24px;
  color: #dbe9e7;
  background: #102b31;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
}

.footer-brand {
  color: #fff;
}

.site-footer p {
  max-width: 480px;
  color: #b9cbc8;
  line-height: 1.7;
}

.site-footer h2 {
  margin: 0 0 12px;
  color: #fff;
  font-size: 15px;
  text-transform: uppercase;
}

.site-footer a {
  display: block;
  margin: 8px 0;
  color: #dbe9e7;
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus {
  color: #fff;
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  color: #a9bfbc;
  font-size: 14px;
}

@media (max-width: 1100px) {
  .nav-shell {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 12px 0;
  }

  .site-search {
    width: 100%;
  }

  .nav-links {
    justify-content: flex-start;
    width: 100%;
  }
}

@media (max-width: 980px) {
  h1 {
    font-size: 48px;
  }

  .grid.cards,
  .category-rail,
  .list-card-grid,
  .compact-list-grid,
  .grid.two,
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metric-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .filter-bar,
  .detail-layout,
  .media-feature,
  .directory-media {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }

  .platform-breakdown {
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 720px) {
  .nav-shell,
  .section-inner,
  .footer-grid,
  .footer-bottom {
    width: calc(100% - 32px);
    max-width: var(--max);
  }

  .nav-shell {
    align-items: flex-start;
    min-height: auto;
    padding: 14px 0;
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .nav-links a {
    min-width: 0;
    padding-inline: 8px;
    font-size: 14px;
    justify-content: center;
    text-align: center;
  }

  .list-card-grid,
  .compact-list-grid {
    grid-template-columns: 1fr;
  }

  .rank-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
  }

  .rank-number {
    width: 36px;
    height: 36px;
  }

  .site-search input {
    font-size: 15px;
  }

  .site-search-results {
    max-height: min(72vh, 620px);
    overflow-y: auto;
  }

  .hero {
    min-height: 620px;
    background-image:
      linear-gradient(180deg, rgba(251, 250, 247, 0.98) 0%, rgba(251, 250, 247, 0.86) 56%, rgba(251, 250, 247, 0.28) 100%),
      url("/assets/online-tutoring-hero.jpg");
    background-position: center bottom;
  }

  .hero-content {
    width: min(100% - 32px, 620px);
    margin: 0 auto;
    padding: 48px 0 120px;
  }

  h1 {
    font-size: 38px;
  }

  .hero p {
    font-size: 17px;
  }

  .metric-strip,
  .grid.cards,
  .category-rail,
  .grid.two,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 50px 0;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .section h2,
  .page-title h1,
  .article h2 {
    font-size: 28px;
  }

  .detail-panel h1 {
    font-size: 34px;
  }

  .detail-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .rank-item {
    grid-template-columns: 1fr;
  }

  .compare-table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }

  .compare-table th,
  .compare-table td {
    min-width: 190px;
  }
}