:root {
  --bg: #f5f3ee;
  --surface: #fff;
  --ink: #1f211e;
  --muted: #666960;
  --line: #d9d8d0;
  --accent: #ae2735;
  --accent-dark: #851b27;
  --soft: #f7e8ea;
  --ok: #e9f4eb;
  --field: #fff;
  --subtle: #eeece6;
  --code-bg: #efeee9;
  --control-border: #aaa;
  --secondary-button: #363934;
  --danger: #a21f2c;
  --warning: #9a6312;
  --warning-bg: #fff2d7;
  --card-shadow: #00000008;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #141614;
  --surface: #1d201d;
  --ink: #f0eee8;
  --muted: #a7aaa2;
  --line: #3b3e39;
  --accent: #d55762;
  --accent-dark: #f07882;
  --soft: #3b2024;
  --ok: #1e3525;
  --field: #171917;
  --subtle: #282b27;
  --code-bg: #252824;
  --control-border: #555950;
  --secondary-button: #555a53;
  --danger: #f07a84;
  --warning: #e9b45b;
  --warning-bg: #3a2e1c;
  --card-shadow: #00000038;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 Inter, system-ui, -apple-system, "Segoe UI", sans-serif; }
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 64px; padding: 0 max(24px, calc((100vw - 1120px) / 2)); border-bottom: 1px solid var(--line); background: var(--surface); }
.nav nav { display: flex; align-items: center; gap: 20px; }
.nav form { margin: 0; }
.brand { color: var(--ink); font-size: 20px; font-weight: 800; text-decoration: none; }
a, .link { color: var(--accent-dark); }
main { max-width: 1120px; margin: auto; padding: 64px 24px; }
.narrow { max-width: 760px; }
.hero { max-width: 800px; padding: 56px 0 88px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1 { max-width: 900px; margin: 0 0 20px; font-size: clamp(38px, 6vw, 70px); line-height: 1.02; letter-spacing: -.045em; }
h2 { margin: 40px 0 16px; font-size: 24px; }
h3 { margin: 0 0 8px; font-size: 20px; }
.lead { max-width: 650px; color: var(--muted); font-size: 21px; }
.actions { display: flex; align-items: center; gap: 18px; margin-top: 30px; color: var(--muted); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px; border: 0; border-radius: 7px; background: var(--accent); color: #fff; font-weight: 700; text-decoration: none; cursor: pointer; }
.button:hover { background: var(--accent-dark); }
.button.small { min-height: 36px; padding: 0 14px; }
.button.secondary { background: var(--secondary-button); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.card { padding: 24px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); box-shadow: 0 1px 2px var(--card-shadow); }
.price { margin: 12px 0 4px; font-size: 26px; font-weight: 800; }
.form { display: grid; gap: 16px; }
.form h2 { margin: 0; }
.form label, .option-row label { display: grid; gap: 6px; font-weight: 650; }
.form input, .form select, .option-row input { width: 100%; min-height: 42px; padding: 8px 10px; border: 1px solid var(--control-border); border-radius: 6px; background: var(--field); color: var(--ink); font: inherit; }
.form fieldset { display: flex; gap: 20px; padding: 12px; border: 1px solid var(--line); }
.radio { display: flex !important; align-items: center; gap: 7px; }
.radio input { width: auto; min-height: auto; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.compact { margin-top: 16px; }
.notice { margin: 18px 0; padding: 14px 16px; border: 1px solid #b8d3bc; border-radius: 7px; background: var(--ok); }
.notice.error { border-color: #e3a8ae; background: var(--soft); }
.page-head { display: flex; justify-content: space-between; gap: 24px; }
.page-head h1 { font-size: 44px; }
.access { display: grid; align-content: center; min-width: 220px; padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.access strong { font-size: 28px; }
.access span, .access small { color: var(--muted); }
.trial { display: flex; align-items: center; justify-content: space-between; margin: 30px 0; }
.trial h2 { margin: 0; }
.buy { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 14px; }
.admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.admin-grid + section .cards { grid-template-columns: 1fr; }
.option-row { display: grid; grid-template-columns: 140px minmax(180px, 1fr) 110px 120px; align-items: end; gap: 12px; padding: 14px 0; border-top: 1px solid var(--line); }
.option-row.new { margin-top: 12px; padding: 16px; background: var(--subtle); }
.table { overflow: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.tr { display: grid; grid-template-columns: 70px 2fr 1fr 1fr 1fr; gap: 12px; padding: 11px 14px; border-top: 1px solid var(--line); }
.tr:first-child { border: 0; }
.tr.head { background: var(--subtle); color: var(--muted); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.grants .tr { grid-template-columns: 1fr 1fr 2fr 1fr 1fr; }
.spaced { margin-top: 12px; }
.tr select { max-width: 130px; padding: 5px; border: 1px solid var(--line); border-radius: 4px; background: var(--field); color: var(--ink); }
.link { padding: 0; border: 0; background: none; font: inherit; text-decoration: underline; cursor: pointer; }
.danger { color: var(--danger); }
code { display: block; overflow: auto; padding: 12px; background: var(--code-bg); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.theme-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex: none;
  cursor: pointer;
}

.theme-switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.theme-switch-track {
  position: relative;
  width: 38px;
  height: 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--subtle);
  transition: background 150ms ease, border-color 150ms ease;
}

.theme-switch-track::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--muted);
  content: "";
  transition: transform 150ms ease, background 150ms ease;
}

.theme-switch input:checked + .theme-switch-track {
  border-color: var(--accent);
  background: var(--accent);
}

.theme-switch input:checked + .theme-switch-track::after {
  background: #fff;
  transform: translateX(16px);
}

.theme-switch input:focus-visible + .theme-switch-track {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.account-nav-link {
  color: var(--muted);
  font-weight: 650;
  text-decoration: none;
}

.account-nav-link:hover,
.account-nav-link.active {
  color: var(--ink);
}

.account-nav-link.active {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 7px;
}

.dashboard-section,
.subscription-section {
  margin-top: 56px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
}

.section-heading small {
  color: var(--muted);
}

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

.metric-card {
  display: grid;
  min-height: 190px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 1px 2px var(--card-shadow);
}

.metric-card > span,
.metric-card > small {
  color: var(--muted);
}

.metric-card > strong {
  align-self: center;
  font-size: clamp(38px, 5vw, 58px);
  line-height: 1;
  letter-spacing: -.04em;
}

.learning-filters {
  display: flex;
  align-items: end;
  gap: 14px;
  margin-bottom: 14px;
  padding: 16px;
}

.learning-filters label {
  display: grid;
  min-width: 170px;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.learning-filters select {
  min-height: 40px;
  padding: 7px 34px 7px 10px;
  border: 1px solid var(--control-border);
  border-radius: 6px;
  background: var(--field);
  color: var(--ink);
  font: inherit;
}

.learning-metrics { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.learning-metrics .metric-card { min-height: 168px; }
.coverage-metric > strong { color: var(--accent); }

.learning-word-lists {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}

.learning-word-lists details { padding: 0; overflow: hidden; }

.learning-word-lists summary {
  display: flex;
  justify-content: space-between;
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 750;
}

.learning-word-lists summary span { color: var(--muted); }

.learning-word-list {
  max-height: 430px;
  margin: 0;
  padding: 0;
  overflow: auto;
  border-top: 1px solid var(--line);
  list-style: none;
}

.learning-word-list li {
  display: grid;
  grid-template-columns: minmax(52px, auto) minmax(90px, .8fr) minmax(120px, 1.4fr);
  align-items: baseline;
  gap: 10px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
}

.learning-word-list li:last-child { border-bottom: 0; }
.learning-word-list b { font-size: 18px; }
.learning-word-list span { color: var(--muted); }
.learning-word-list em { grid-column: 1 / -1; color: var(--muted); font-size: 11px; font-style: normal; }
.learning-word-list .empty-state { display: block; }

.level-stats-card {
  display: grid;
  grid-template-columns: minmax(210px, .8fr) 2fr;
  gap: 28px;
  margin-top: 14px;
}

.level-stats-card p {
  margin: 0;
  color: var(--muted);
}

.level-breakdown {
  display: grid;
  grid-template-columns: repeat(6, minmax(72px, 1fr));
  gap: 8px;
}

.level-breakdown > div {
  display: grid;
  gap: 8px;
  align-content: center;
  min-height: 86px;
  padding: 12px;
  border-left: 3px solid var(--accent);
  background: var(--subtle);
}

.level-breakdown span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.level-breakdown strong {
  font-size: 22px;
}

.subscription-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border-left: 4px solid var(--accent);
}

.subscription-card h3 {
  margin-top: 10px;
  font-size: 28px;
}

.subscription-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.subscription-actions {
  display: grid;
  justify-items: end;
  gap: 14px;
  text-align: right;
}

.plan-status {
  display: inline-flex;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--ok);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.plan-status.neutral {
  background: var(--subtle);
  color: var(--muted);
}

.referral-card {
  margin-top: 56px;
}

.referral-card h2 {
  margin-top: 0;
}

.plans-page .page-head {
  margin-bottom: 48px;
}

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

.plan-card {
  min-height: 220px;
}

.plan-card.is-current {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.plan-card.is-included {
  background: var(--subtle);
}

.included-copy {
  margin-top: 28px;
  color: var(--muted);
}

/* Administrative workspace. */

.admin-header {
  border-bottom: 0;
}

.admin-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.admin-nav {
  display: flex;
  gap: 30px;
  overflow-x: auto;
  padding: 0 max(24px, calc((100vw - 1240px) / 2));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  scrollbar-width: none;
}

.admin-nav a {
  flex: none;
  padding: 14px 0 12px;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.admin-nav a:hover,
.admin-nav a.active {
  color: var(--ink);
}

.admin-nav a.active {
  border-bottom-color: var(--accent);
}

.admin-main {
  max-width: 1240px;
  padding-top: 52px;
}

.admin-page-title,
.admin-user-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.admin-page-title h1,
.admin-user-head h1 {
  margin-bottom: 0;
  font-size: clamp(40px, 5vw, 58px);
}

.admin-page-title > p,
.admin-user-head > div > p:last-child,
.admin-intro {
  color: var(--muted);
}

.admin-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.admin-metric {
  display: grid;
  min-height: 182px;
  padding: 22px;
  border-right: 1px solid var(--line);
}

.admin-metric:last-child {
  border-right: 0;
}

.admin-metric > span,
.admin-metric > small {
  color: var(--muted);
}

.admin-metric > strong {
  align-self: center;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  letter-spacing: -.04em;
}

.admin-metric.featured {
  background: var(--ink);
  color: var(--bg);
}

.admin-metric.featured > span,
.admin-metric.featured > small {
  color: color-mix(in srgb, var(--bg), transparent 28%);
}

.admin-overview-grid,
.admin-two-columns,
.admin-user-grid,
.settings-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 54px;
}

.admin-panel {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: 0 1px 2px var(--card-shadow);
}

.admin-panel:not(.table-panel) {
  padding: 24px;
}

.admin-panel h2 {
  margin: 0;
  font-size: 23px;
}

.admin-panel-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
  margin-bottom: 14px;
}

.admin-panel-heading h2 {
  margin: 0;
}

.admin-panel-heading > span,
.admin-panel-heading > a {
  color: var(--muted);
  font-size: 13px;
}

.data-list {
  overflow-y: auto;
  max-height: 520px;
}

.compact-list {
  max-height: 390px;
  margin: 22px -24px -24px;
  border-top: 1px solid var(--line);
}

.data-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 66px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.data-row:last-child {
  border-bottom: 0;
}

a.data-row {
  color: var(--ink);
  text-decoration: none;
}

a.data-row:hover {
  background: var(--subtle);
}

.data-row > div,
.data-table-row > div {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.data-row small,
.data-table-row small {
  color: var(--muted);
}

.payment-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
}

.user-summary-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

.status-pill {
  display: inline-flex;
  width: fit-content;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--subtle);
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  line-height: 1.2;
  text-transform: uppercase;
}

.status-pill.success {
  background: var(--ok);
  color: var(--ink);
}

.status-pill.warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.admin-quick-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.admin-quick-links a {
  display: flex;
  justify-content: space-between;
  padding: 22px;
  border-right: 1px solid var(--line);
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
}

.admin-quick-links a:last-child {
  border-right: 0;
}

.admin-quick-links a:hover {
  background: var(--subtle);
}

.admin-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 180px 180px auto;
  align-items: end;
  gap: 12px;
  margin: 28px 0 14px;
}

.admin-toolbar label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.admin-toolbar input,
.admin-toolbar select,
.data-table select,
.inline-form select {
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--control-border);
  border-radius: 6px;
  background: var(--field);
  color: var(--ink);
  font: inherit;
}

.toolbar-count {
  padding-bottom: 9px;
  color: var(--muted);
  white-space: nowrap;
}

.data-table {
  min-width: 880px;
}

.data-table-head,
.data-table-row {
  display: grid;
  align-items: center;
  gap: 16px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
}

.data-table-head {
  background: var(--subtle);
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.data-table-row:last-child {
  border-bottom: 0;
}

.data-table-row[hidden] {
  display: none;
}

.data-table-row a {
  color: var(--ink);
}

.data-table-row form {
  margin: 0;
}

.users-table .data-table-head,
.users-table .data-table-row {
  grid-template-columns: minmax(230px, 1.7fr) 150px minmax(190px, 1.3fr) 150px 32px;
}

.billing-table .data-table-head,
.billing-table .data-table-row,
.payments-table .data-table-head,
.payments-table .data-table-row,
.grants-table .data-table-head,
.grants-table .data-table-row {
  grid-template-columns: minmax(220px, 1.5fr) 130px 170px 120px 100px;
}

.grants-table .data-table-head,
.grants-table .data-table-row {
  grid-template-columns: minmax(220px, 1.4fr) 100px 160px minmax(180px, 1fr) 110px 90px;
}

.table-panel {
  overflow-x: auto;
}

.row-arrow {
  color: var(--muted) !important;
  font-size: 20px;
  text-decoration: none;
}

.empty-state,
.muted {
  color: var(--muted);
}

.empty-state {
  padding: 18px;
}

.admin-section-block {
  margin-top: 52px;
}

.admin-intro {
  max-width: 660px;
  margin: 26px 0 34px;
}

.admin-plan-list {
  display: grid;
  gap: 14px;
}

.admin-plan-title,
.admin-plan-title > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.admin-plan-title p {
  margin: 2px 0 0;
  color: var(--muted);
}

.plan-index {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 20px;
  font-weight: 850;
}

.plan-option-list {
  margin: 22px -24px -24px;
  border-top: 1px solid var(--line);
}

.plan-option-row {
  display: grid;
  grid-template-columns: 180px 180px minmax(220px, 1fr) 120px;
  align-items: end;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--line);
}

.plan-option-row:last-child {
  border-bottom: 0;
}

.plan-option-row label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.plan-option-row label input {
  grid-column: 1;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--control-border);
  border-radius: 6px;
  background: var(--field);
  color: var(--ink);
  font: inherit;
}

.plan-option-row label small {
  grid-column: 2;
  grid-row: 2;
  align-self: center;
}

.plan-option-row .check-field {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  color: var(--ink);
}

.plan-option-row .check-field input {
  min-height: auto;
}

.new-option-row {
  background: var(--subtle);
}

.admin-access-layout {
  display: grid;
  grid-template-columns: minmax(360px, .9fr) 1.4fr;
  gap: 18px;
  margin-top: 34px;
}

.grant-form > p:not(.eyebrow),
.settings-form p,
.settings-note dd {
  color: var(--muted);
}

.admin-access-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.admin-access-summary article {
  display: grid;
  min-height: 170px;
  padding: 20px;
  border-right: 1px solid var(--line);
}

.admin-access-summary article:last-child {
  border-right: 0;
}

.admin-access-summary span,
.admin-access-summary small {
  color: var(--muted);
}

.admin-access-summary strong {
  align-self: center;
  font-size: 42px;
}

.access-list-row,
.reward-list-row {
  min-height: 72px;
}

.access-list-row span,
.reward-list-row > span {
  color: var(--muted);
  font-size: 13px;
}

.settings-layout {
  align-items: start;
  margin-top: 34px;
}

.settings-form {
  gap: 22px;
}

.field-with-suffix {
  display: grid;
  grid-template-columns: 1fr 60px;
  align-items: center;
  gap: 10px;
}

.settings-note dl {
  margin: 20px 0 0;
}

.settings-note dl > div {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.settings-note dt {
  font-weight: 800;
}

.settings-note dd {
  margin: 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 28px;
}

.admin-user-head {
  align-items: center;
}

.admin-user-metrics {
  margin-top: 34px;
}

.admin-user-grid {
  align-items: stretch;
  margin-top: 18px;
}

.user-subscription-summary {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.user-subscription-summary h3 {
  margin-top: 10px;
  font-size: 28px;
}

.compact-admin-form {
  gap: 14px;
}

.user-account-settings {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 18px;
}

.inline-form {
  display: flex;
  align-items: center;
  gap: 10px;
}

.teacher-section {
  margin-top: 56px;
}

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

.teacher-section .referral-card {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  align-items: center;
  gap: 28px;
  margin-top: 14px;
}

.teacher-section .referral-card p {
  margin-bottom: 0;
  color: var(--muted);
}

@media (max-width: 720px) {
  main { padding: 38px 18px; }
  .nav { padding: 0 18px; }
  .nav nav { gap: 12px; }
  .split, .admin-grid, .dashboard-grid, .level-stats-card, .plan-cards,
  .admin-overview-grid, .admin-two-columns, .admin-user-grid, .settings-layout,
  .admin-access-layout, .teacher-grid, .teacher-section .referral-card,
  .learning-word-lists { grid-template-columns: 1fr; }
  .actions, .trial, .page-head, .subscription-card { align-items: flex-start; flex-direction: column; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .level-breakdown { grid-template-columns: repeat(2, 1fr); }
  .subscription-actions { justify-items: start; text-align: left; }
  .learning-filters { align-items: stretch; flex-direction: column; }
  .learning-filters label { width: 100%; }
  .option-row { grid-template-columns: 1fr 1fr; }
  .tr { min-width: 760px; }
  h1 { font-size: 40px; }
}

@media (max-width: 980px) {
  .admin-metrics { grid-template-columns: 1fr 1fr; }
  .admin-metric:nth-child(2) { border-right: 0; }
  .admin-metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .admin-toolbar { grid-template-columns: 1fr 1fr; }
  .admin-toolbar .search-field { grid-column: 1 / -1; }
  .plan-option-row { grid-template-columns: 1fr 1fr; }
  .admin-access-summary { grid-template-columns: 1fr; }
  .admin-access-summary article { min-height: 120px; border-right: 0; border-bottom: 1px solid var(--line); }
  .admin-access-summary article:last-child { border-bottom: 0; }
}

@media (max-width: 720px) {
  .admin-main { padding-top: 34px; }
  .admin-nav { padding-inline: 18px; }
  .admin-page-title, .admin-user-head, .user-account-settings { align-items: flex-start; flex-direction: column; }
  .admin-metrics { grid-template-columns: 1fr; }
  .admin-metric { min-height: 150px; border-right: 0; border-bottom: 1px solid var(--line); }
  .admin-metric:last-child { border-bottom: 0; }
  .admin-quick-links { grid-template-columns: 1fr; }
  .admin-quick-links a { border-right: 0; border-bottom: 1px solid var(--line); }
  .admin-quick-links a:last-child { border-bottom: 0; }
  .admin-toolbar { grid-template-columns: 1fr; }
  .admin-toolbar .search-field { grid-column: auto; }
  .plan-option-row { grid-template-columns: 1fr; }
  .admin-plan-title { align-items: flex-start; flex-direction: column; }
  .inline-form { align-items: stretch; flex-direction: column; width: 100%; }
  .payment-row { grid-template-columns: minmax(0, 1fr) auto; }
  .payment-row .status-pill { grid-column: 1 / -1; }
}

/* Landing page: editorial, product-specific presentation. */

.landing-page {
  --landing-paper: #f3f0e8;
  --landing-sheet: #fbfaf6;
  --landing-ink: #20211d;
  --landing-muted: #65675f;
  --landing-rule: #c9c6bb;
  --landing-red: #a62d35;
  --landing-red-dark: #7d2027;
  --landing-panel-border: #aaa79c;
  --landing-shadow: #ded9cc;
  --landing-toolbar: #e9e6dd;
  --landing-address: #f6f4ee;
  --landing-address-ink: #7a7a72;
  --landing-highlight: #f2e0df;
  --landing-card: #fffefa;
  --landing-card-shadow: #d5d0c3;
  --landing-context: #ded9cc;
  --landing-context-rule: #b9b4a8;
  --landing-token: #efe1dc;
  --landing-popup: #fffefb;
  --landing-popup-border: #d8d6cf;
  --landing-popup-ink: #20201e;
  --landing-popup-muted: #3f3f3b;
  --landing-popup-secondary: #696963;
  --landing-popup-hover: #f3f2ee;
  background: var(--landing-paper);
  color: var(--landing-ink);
  font-family: "Segoe UI", Arial, sans-serif;
}

:root[data-theme="dark"] .landing-page {
  --landing-paper: #141614;
  --landing-sheet: #1d201d;
  --landing-ink: #f0eee8;
  --landing-muted: #a7aaa2;
  --landing-rule: #3b3e39;
  --landing-red: #d55762;
  --landing-red-dark: #f07882;
  --landing-panel-border: #555950;
  --landing-shadow: #292c28;
  --landing-toolbar: #292c28;
  --landing-address: #1a1c1a;
  --landing-address-ink: #a7aaa2;
  --landing-highlight: #47282c;
  --landing-card: #222521;
  --landing-card-shadow: #0c0d0c;
  --landing-context: #252824;
  --landing-context-rule: #484c45;
  --landing-token: #47282c;
  --landing-popup: #222521;
  --landing-popup-border: #4b4f47;
  --landing-popup-ink: #f0eee8;
  --landing-popup-muted: #c0c2bb;
  --landing-popup-secondary: #a7aaa2;
  --landing-popup-hover: #30342f;
}

.landing-header,
.landing-main,
.landing-footer {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  border-bottom: 1px solid var(--landing-rule);
}

.landing-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--landing-ink);
  font-weight: 800;
  letter-spacing: -.02em;
  text-decoration: none;
}

.brand-seal {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  background: var(--landing-red);
  color: white;
  font-family: "Noto Serif CJK SC", "Songti SC", serif;
  font-size: 21px;
  font-weight: 500;
}

.landing-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
}

.landing-nav a {
  color: var(--landing-ink);
  text-underline-offset: 5px;
}

.landing-nav .nav-action {
  padding: 9px 14px;
  border: 1px solid var(--landing-ink);
  text-decoration: none;
}

.landing-main {
  max-width: none;
  padding: 0;
}

.product-hero {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(500px, 1.08fr);
  align-items: center;
  gap: clamp(42px, 7vw, 90px);
  min-height: 690px;
  padding: 84px 0 92px;
}

.section-label {
  margin: 0 0 18px;
  color: var(--landing-red);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.hero-copy h1,
.landing-page h2 {
  font-family: "Iowan Old Style", "Palatino Linotype", "Noto Serif", Georgia, serif;
  font-weight: 600;
}

.hero-copy h1 {
  max-width: 630px;
  margin: 0;
  font-size: clamp(46px, 5.2vw, 73px);
  line-height: .99;
  letter-spacing: -.045em;
}

.hero-lead {
  max-width: 590px;
  margin: 28px 0 0;
  color: var(--landing-muted);
  font-size: 19px;
  line-height: 1.58;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 34px;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--landing-red);
  background: var(--landing-red);
  color: white;
  font-weight: 750;
  text-decoration: none;
}

.primary-action:hover {
  border-color: var(--landing-red-dark);
  background: var(--landing-red-dark);
}

.text-action {
  color: var(--landing-ink);
  font-weight: 700;
  text-underline-offset: 5px;
}

.hero-note,
.plans-note {
  margin: 18px 0 0;
  color: var(--landing-muted);
  font-size: 13px;
}

.reading-demo {
  border: 1px solid var(--landing-panel-border);
  background: var(--landing-sheet);
  box-shadow: 14px 14px 0 var(--landing-shadow);
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 14px;
  border-bottom: 1px solid var(--landing-rule);
  background: var(--landing-toolbar);
}

.browser-bar > span {
  width: 8px;
  height: 8px;
  border: 1px solid #88867f;
  border-radius: 50%;
}

.browser-bar div {
  flex: 1;
  margin-left: 10px;
  padding: 5px 10px;
  background: var(--landing-address);
  color: var(--landing-address-ink);
  font: 11px/1.2 ui-monospace, monospace;
}

.demo-article {
  min-height: 430px;
  padding: 48px 54px 56px;
}

.demo-section {
  margin: 0 0 10px;
  color: var(--landing-red);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.demo-article h2 {
  max-width: 440px;
  margin: 0 0 28px;
  font-size: 34px;
  line-height: 1.08;
}

.demo-article > p:not(.demo-section) {
  margin: 0 0 20px;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: 18px;
  line-height: 1.9;
}

ruby rt {
  color: var(--landing-red);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 9px;
  font-weight: 700;
}

.inline-word,
.learned-word > ruby {
  padding: 1px 3px;
  border-bottom: 2px solid var(--landing-red);
  background: var(--landing-highlight);
  font-family: "Noto Serif CJK SC", "Songti SC", serif;
}

.learned-word {
  position: relative;
  white-space: nowrap;
}

.word-card {
  position: absolute;
  z-index: 2;
  top: calc(100% + 12px);
  left: -24px;
  display: grid;
  width: 205px;
  grid-template-columns: 1fr auto;
  gap: 3px 12px;
  padding: 14px 16px;
  border: 1px solid var(--landing-panel-border);
  background: var(--landing-card);
  box-shadow: 5px 5px 0 var(--landing-card-shadow);
  font-family: "Segoe UI", Arial, sans-serif;
  line-height: 1.3;
  white-space: normal;
}

.word-card b { font: 600 25px/1 "Noto Serif CJK SC", "Songti SC", serif; }
.word-card i { color: var(--landing-red); font-style: normal; font-weight: 700; }
.word-card span { grid-column: 1 / -1; color: var(--landing-muted); font-size: 12px; }
.word-card .sound-label { grid-column: 1 / -1; justify-self: start; padding-top: 5px; color: var(--landing-ink); font-size: 12px; font-weight: 750; }

.demo-caption {
  display: flex;
  gap: 24px;
  padding: 14px 18px;
  border-top: 1px solid var(--landing-rule);
  color: var(--landing-muted);
  font-size: 11px;
}

.demo-caption span::before {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 7px;
  background: var(--landing-red);
  content: "";
}

.demo-caption span + span::before { border: 1px solid var(--landing-muted); background: var(--landing-sheet); }

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-block: 1px solid var(--landing-rule);
}

.facts div {
  display: grid;
  gap: 3px;
  padding: 30px 24px;
  border-left: 1px solid var(--landing-rule);
}

.facts div:first-child { padding-left: 0; border-left: 0; }
.facts strong { font: 600 27px/1.1 "Iowan Old Style", Georgia, serif; }
.facts span { color: var(--landing-muted); font-size: 13px; }

.explanation {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(60px, 10vw, 140px);
  padding: 128px 0;
  scroll-margin-top: 30px;
}

.section-intro h2,
.research-section h2,
.context-copy h2,
.teacher-section h2,
.final-cta h2 {
  margin: 0;
  font-size: clamp(38px, 4.2vw, 58px);
  line-height: 1.04;
  letter-spacing: -.035em;
}

.section-intro > p:last-child,
.context-copy > p,
.teacher-section > p {
  margin: 24px 0 0;
  color: var(--landing-muted);
  font-size: 17px;
  line-height: 1.65;
}

.steps {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--landing-rule);
  list-style: none;
}

.steps li {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 22px;
  padding: 25px 0;
  border-bottom: 1px solid var(--landing-rule);
}

.steps li > span { color: var(--landing-red); font: 700 12px/1.5 ui-monospace, monospace; }
.steps h3 { margin: 0 0 7px; font-size: 18px; }
.steps p { margin: 0; color: var(--landing-muted); line-height: 1.6; }

.research-section {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(60px, 10vw, 140px);
  padding: 0 0 110px;
}

.research-copy {
  padding: 32px;
  border: 1px solid var(--landing-panel-border);
  background: var(--landing-context);
}

.research-copy p {
  margin: 0 0 18px;
  color: var(--landing-muted);
  font-size: 16px;
  line-height: 1.7;
}

.research-link {
  color: var(--landing-red);
  font-weight: 750;
}

.context-section {
  display: grid;
  grid-template-columns: 1fr .92fr;
  gap: clamp(60px, 9vw, 120px);
  align-items: center;
  padding: 110px 0;
  border-top: 1px solid var(--landing-rule);
}

.context-sample {
  padding: 46px;
  border: 1px solid var(--landing-panel-border);
  background: var(--landing-context);
  transform: rotate(-1.2deg);
}

.context-sample p {
  margin: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--landing-context-rule);
  font: 500 clamp(22px, 3vw, 33px)/1.25 "Iowan Old Style", Georgia, serif;
}

.demo-context-word {
  position: relative;
  display: inline-block;
  color: var(--landing-red);
  font-family: "Noto Serif CJK SC", "Songti SC", serif;
}

.context-token {
  padding: 0 2px;
  border: 0;
  border-bottom: 2px solid var(--landing-red);
  background: var(--landing-token);
  color: inherit;
  cursor: pointer;
  font: inherit;
}

.context-token:focus-visible {
  outline: 2px solid #1769aa;
  outline-offset: 3px;
}

.demo-context-word.is-revealed .context-token {
  border-bottom-style: dashed;
  background: transparent;
  color: var(--landing-ink);
  font-family: "Iowan Old Style", Georgia, serif;
  font-style: italic;
}


.context-word-popup {
  position: absolute;
  z-index: 10;
  top: calc(100% + 12px);
  left: -18px;
  display: block;
  width: max-content;
  max-width: min(360px, calc(100vw - 32px));
  overflow: hidden;
  padding: 13px 14px 0;
  border: 1px solid var(--landing-popup-border);
  border-radius: 8px;
  background: var(--landing-popup);
  box-shadow: 0 12px 30px rgb(32 32 30 / 14%), 0 2px 6px rgb(32 32 30 / 10%);
  color: var(--landing-popup-ink);
  font: 13px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  opacity: 0;
  pointer-events: none;
  text-align: left;
  transform: translateY(-3px) rotate(1.2deg);
  transition: opacity 100ms ease-out, transform 100ms ease-out;
  visibility: hidden;
}

.demo-context-word.is-open .context-word-popup {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) rotate(1.2deg);
  visibility: visible;
}

.context-sample p:nth-child(3) .context-word-popup {
  right: -18px;
  left: auto;
}

.demo-tip-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  min-width: 280px;
  gap: 18px;
}

.demo-tip-header > span { display: flex; align-items: baseline; min-width: 0; }
.demo-tip-header b { color: var(--landing-popup-ink); font: 690 24px/1.15 "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif; }
.demo-tip-header i { margin-left: 9px; color: var(--landing-popup-secondary); font-size: 14px; font-style: normal; }
.demo-tip-header em { flex: none; margin-top: 3px; padding-left: 7px; border-left: 3px solid rgb(20 116 95); color: rgb(20 116 95); font-size: 10px; font-style: normal; font-weight: 700; line-height: 16px; white-space: nowrap; }
.demo-tip-russian { display: block; margin-top: 5px; color: var(--landing-popup-muted); }

.demo-tip-actions {
  display: grid;
  grid-template-columns: auto auto;
  margin: 13px -14px 0;
  border-top: 1px solid var(--landing-popup-border);
}

.demo-tip-actions button {
  min-height: 36px;
  padding: 0 12px;
  border: 0;
  border-right: 1px solid var(--landing-popup-border);
  background: var(--landing-popup);
  color: var(--landing-popup-muted);
  cursor: pointer;
  font: 600 11px/1 system-ui, -apple-system, "Segoe UI", sans-serif;
  white-space: nowrap;
}

.demo-tip-actions button:last-child { border-right: 0; }
.demo-tip-actions button:hover { background: var(--landing-popup-hover); color: var(--landing-popup-ink); }
.demo-tip-actions button:focus-visible { position: relative; z-index: 1; outline: 2px solid #1769aa; outline-offset: -3px; }
.context-copy ul { margin: 28px 0 0; padding: 0; list-style: none; }
.context-copy li { padding: 11px 0 11px 24px; border-top: 1px solid var(--landing-rule); }
.context-copy li::before { float: left; margin-left: -24px; color: var(--landing-red); content: "—"; }

.plans-section {
  padding: 118px 0;
  border-top: 1px solid var(--landing-rule);
  scroll-margin-top: 30px;
}

.plans-intro { display: grid; grid-template-columns: .32fr 1fr .75fr; gap: 38px; align-items: start; }
.plans-intro .section-label { margin-top: 9px; }
.plans-intro h2 { font-size: clamp(36px, 4vw, 56px); }
.plans-intro > p:last-child { margin: 8px 0 0; }
.plans-table { margin-top: 62px; border-top: 2px solid var(--landing-ink); }

.plan-row {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(230px, .8fr) 130px;
  align-items: center;
  gap: 30px;
  min-height: 138px;
  padding: 23px 0;
  border-bottom: 1px solid var(--landing-rule);
}

.plan-index { color: var(--landing-red); font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.plan-row h3 { margin: 5px 0 2px; font: 600 27px/1.1 "Iowan Old Style", Georgia, serif; }
.plan-row p { margin: 0; color: var(--landing-muted); font-size: 13px; }
.plan-row > strong { font: 600 30px/1 "Iowan Old Style", Georgia, serif; }
.plan-row > a { justify-self: end; color: var(--landing-ink); font-weight: 750; text-underline-offset: 5px; }
.plan-prices { display: flex; flex-wrap: wrap; gap: 20px 34px; }
.plan-prices span { display: grid; gap: 3px; }
.plan-prices strong { font: 600 24px/1.1 "Iowan Old Style", Georgia, serif; }
.plan-prices small { color: var(--landing-muted); }

.teacher-section {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 40px 90px;
  padding: 92px 0;
  border-block: 1px solid var(--landing-rule);
}

.teacher-section h2 { max-width: 700px; font-size: clamp(35px, 3.5vw, 49px); }
.teacher-section > p { margin-top: 32px; }
.teacher-section > a { grid-column: 2; }

.final-cta { padding: 130px 0; text-align: center; }
.final-cta h2 { max-width: 790px; margin-inline: auto; }
.final-cta .primary-action { margin-top: 34px; }

.landing-footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  align-items: center;
  gap: 30px;
  padding: 30px 0 44px;
  border-top: 1px solid var(--landing-rule);
  color: var(--landing-muted);
  font-size: 13px;
}

.landing-footer p { margin: 0; }
.landing-footer nav { display: flex; gap: 24px; }
.landing-footer nav a { color: var(--landing-ink); }

@media (max-width: 980px) {
  .product-hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-copy { max-width: 760px; }
  .reading-demo { width: min(680px, 100%); }
  .facts { grid-template-columns: 1fr 1fr; }
  .facts div:nth-child(3) { padding-left: 0; border-left: 0; border-top: 1px solid var(--landing-rule); }
  .facts div:nth-child(4) { border-top: 1px solid var(--landing-rule); }
  .explanation, .research-section, .context-section { grid-template-columns: 1fr; }
  .plans-intro { grid-template-columns: 1fr; gap: 0; }
  .plans-intro > p:last-child { max-width: 620px; margin-top: 22px; }
}

@media (max-width: 720px) {
  .landing-header, .landing-main, .landing-footer { width: min(100% - 32px, 1180px); }
  .landing-header { min-height: 66px; }
  .landing-nav > a:not(.nav-action):not([href="/account"]) { display: none; }
  .landing-nav { gap: 12px; }
  .product-hero { gap: 52px; padding: 60px 0 70px; }
  .hero-copy h1 { font-size: clamp(42px, 12vw, 58px); }
  .hero-lead { font-size: 17px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .reading-demo { box-shadow: 8px 8px 0 var(--landing-shadow); }
  .demo-article { min-height: 390px; padding: 34px 24px 44px; }
  .demo-article h2 { font-size: 29px; }
  .demo-article > p:not(.demo-section) { font-size: 16px; }
  .word-card { left: -95px; }
  .demo-caption { align-items: flex-start; flex-direction: column; gap: 7px; }
  .facts { grid-template-columns: 1fr; }
  .facts div, .facts div:first-child, .facts div:nth-child(3) { padding: 20px 0; border-top: 1px solid var(--landing-rule); border-left: 0; }
  .facts div:first-child { border-top: 0; }
  .explanation, .context-section, .plans-section { padding: 82px 0; }
  .research-section { padding-bottom: 82px; }
  .steps { margin-top: 44px; }
  .context-sample { padding: 27px; }
  .plan-row { grid-template-columns: 1fr auto; gap: 18px; padding: 28px 0; }
  .plan-row > div:first-child { grid-column: 1 / -1; }
  .plan-row > a { grid-column: 2; grid-row: 2; }
  .plan-prices { grid-column: 1; }
  .teacher-section { grid-template-columns: 1fr; padding: 76px 0; }
  .teacher-section > a { grid-column: 1; }
  .final-cta { padding: 90px 0; text-align: left; }
  .landing-footer { grid-template-columns: 1fr auto; }
  .landing-footer p { display: none; }
}