:root {
  /* Világos téma változói; a sötét téma ugyanennek a készletnek az átírása. */
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #eef3f8;
  --text: #17202a;
  --muted: #637083;
  --line: #dce4ee;
  --primary: #1f6feb;
  --primary-strong: #1557c0;
  --green: #198754;
  --green-soft: #dff6e9;
  --amber: #b7791f;
  --amber-soft: #fff1d6;
  --red: #c24141;
  --red-soft: #ffe2e2;
  --blue-soft: #e5f0ff;
  --teal: #0f766e;
  --teal-soft: #dcf7f3;
  --premium: #6f5f2f;
  --premium-soft: #f1ead2;
  --shadow: 0 18px 45px rgba(23, 32, 42, 0.09);
  --radius: 8px;
  --radius-small: 6px;
  --max-width: 1180px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111821;
  --surface: #17212c;
  --surface-strong: #202c39;
  --text: #eef4fb;
  --muted: #aab7c6;
  --line: #2f4052;
  --primary: #63a4ff;
  --primary-strong: #8dbfff;
  --green: #55c98b;
  --green-soft: #173829;
  --amber: #f4bf63;
  --amber-soft: #3b2c13;
  --red: #ff8585;
  --red-soft: #402121;
  --blue-soft: #182f50;
  --teal: #5ee0d5;
  --teal-soft: #123d3a;
  --premium: #e7cf81;
  --premium-soft: #3c331b;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(31, 111, 235, 0.08), transparent 280px),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

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

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

/* Közös fejléc és navigáció minden oldalon. */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 22px;
  align-items: center;
  padding: 14px max(18px, calc((100vw - var(--max-width)) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 230px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--primary);
  color: #ffffff;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 0.8rem;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.main-nav a {
  border-radius: var(--radius-small);
  color: var(--muted);
  padding: 8px 10px;
  transition: background 180ms ease, color 180ms ease;
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--surface-strong);
  color: var(--text);
}

.topbar-actions {
  display: flex;
  gap: 8px;
  justify-self: end;
}

.theme-toggle,
.account-button {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  transition: transform 180ms ease, border-color 180ms ease;
}

.theme-toggle:hover,
.account-button:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.account-icon {
  position: relative;
  display: block;
  width: 20px;
  height: 20px;
}

.account-icon::before,
.account-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  border: 2px solid currentColor;
  transform: translateX(-50%);
}

.account-icon::before {
  top: 1px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
}

.account-icon::after {
  bottom: 1px;
  width: 16px;
  height: 9px;
  border-radius: 999px 999px 4px 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.page-shell {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 64px;
}

.fade-in {
  animation: fadeIn 420ms ease both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Dashboard hero: a relációs séma vizuális eleme külső kép nélkül is offline működik. */
.hero-band {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 28px;
  align-items: stretch;
  min-height: 340px;
  padding: 28px 0 18px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 0.84rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(2rem, 5vw, 4.1rem);
}

h2 {
  font-size: 1.55rem;
}

h3 {
  font-size: 1.05rem;
}

p {
  margin: 0;
}

.hero-copy p:not(.eyebrow),
.page-title p:not(.eyebrow) {
  max-width: 720px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 1.04rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-weight: 750;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}

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

.btn.primary {
  background: var(--primary);
  color: #ffffff;
}

.btn.primary:hover {
  background: var(--primary-strong);
}

.btn.secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--text);
}

.btn.secondary:hover,
.btn.subtle:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn.subtle {
  border-color: var(--line);
  background: transparent;
  color: var(--muted);
}

.btn.small {
  min-height: 36px;
  padding: 7px 12px;
  font-size: 0.92rem;
}

.schema-visual {
  position: relative;
  display: grid;
  align-content: center;
  gap: 18px;
  min-height: 320px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--surface-strong) 78%, transparent), var(--surface));
  box-shadow: var(--shadow);
  overflow: hidden;
  padding: 28px;
}

.schema-visual::before {
  content: "DK";
  position: absolute;
  right: 22px;
  top: 16px;
  color: color-mix(in srgb, var(--muted) 30%, transparent);
  font-size: 4rem;
  font-weight: 900;
}

.table-box {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 5px;
  width: min(260px, 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 14px;
  box-shadow: 0 10px 24px rgba(23, 32, 42, 0.08);
}

.table-box strong {
  margin-bottom: 4px;
}

.table-box span {
  color: var(--muted);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.9rem;
}

.accent-blue {
  border-left: 5px solid var(--primary);
}

.accent-green {
  justify-self: end;
  border-left: 5px solid var(--green);
}

.relation-line {
  justify-self: center;
  width: 62%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--primary), var(--primary) 8px, transparent 8px, transparent 14px);
}

.query-chip {
  position: relative;
  z-index: 1;
  justify-self: center;
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  padding: 8px 14px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.88rem;
}

/* Újrafelhasználható kártyák, statisztikák és progress sávok. */
.stats-grid,
.topic-grid,
.dashboard-actions,
.flashcard-grid,
.planner-summary,
.planner-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.stat-card,
.topic-card,
.quick-panel,
.planner-card,
.content-card,
.quiz-card,
.timer-panel,
.generator-panel,
.task-card,
.thesis-card,
.progress-panel,
.quiz-toolbar,
.quiz-meta,
.soft-lock-card,
.premium-plan-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 26px rgba(23, 32, 42, 0.05);
}

.stat-card,
.topic-card,
.quick-panel,
.planner-card,
.content-card,
.quiz-card,
.task-card,
.thesis-card,
.soft-lock-card,
.premium-plan-card {
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.stat-card:hover,
.topic-card:hover,
.quick-panel:hover,
.planner-card:hover,
.content-card:hover,
.task-card:hover,
.thesis-card:hover,
.soft-lock-card:hover,
.premium-plan-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--primary) 45%, var(--line));
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 18px;
}

.stat-card span,
.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  line-height: 1.1;
  overflow-wrap: anywhere;
}

.progress-track {
  position: relative;
  height: 10px;
  min-width: 130px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-strong);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--green));
  transition: width 650ms ease;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-top: 38px;
}

.text-link {
  color: var(--primary);
  font-weight: 800;
}

.premium-overview {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 18px;
  align-items: start;
  margin-top: 24px;
  padding: 8px 0 4px;
}

.premium-overview-copy {
  display: grid;
  gap: 14px;
  align-content: start;
}

.premium-overview-copy p {
  color: var(--muted);
}

.premium-plan-grid,
.feature-teaser-row {
  display: grid;
  gap: 12px;
}

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

.premium-plan-card,
.soft-lock-card {
  display: grid;
  gap: 10px;
  min-width: 0;
  padding: 16px;
}

.premium-plan-card.free {
  border-color: color-mix(in srgb, var(--green) 36%, var(--line));
}

.premium-plan-card.premium,
.soft-lock-card.premium {
  border-color: color-mix(in srgb, var(--premium) 36%, var(--line));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--premium-soft) 42%, transparent), transparent 70%),
    var(--surface);
}

.premium-plan-card.lifetime {
  border-color: color-mix(in srgb, var(--primary) 34%, var(--line));
}

.premium-plan-card.supporter {
  border-color: color-mix(in srgb, var(--teal) 34%, var(--line));
}

.premium-plan-card p,
.premium-plan-card li,
.soft-lock-card p {
  color: var(--muted);
}

.premium-plan-card ul {
  display: grid;
  gap: 6px;
  margin: 2px 0 0;
  padding-left: 18px;
}

.feature-teaser-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 16px 0;
}

.feature-teaser-row.single {
  grid-template-columns: minmax(0, 1fr);
}

.teaser-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.soft-feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.soft-feature-list span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface-strong) 72%, transparent);
  color: var(--muted);
  padding: 5px 9px;
  font-size: 0.82rem;
  font-weight: 750;
}

.topic-card {
  display: grid;
  gap: 14px;
  min-height: 220px;
  padding: 18px;
}

.quick-panel {
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 190px;
  padding: 18px;
}

.planner-controls {
  margin-top: 18px;
}

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

.planner-card {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.planner-card.done {
  border-color: color-mix(in srgb, var(--green) 42%, var(--line));
  background: linear-gradient(135deg, color-mix(in srgb, var(--green-soft) 44%, transparent), transparent 68%), var(--surface);
}

.planner-card.skipped {
  border-color: color-mix(in srgb, var(--amber) 42%, var(--line));
}

.planner-date,
.planner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.planner-actions .btn {
  flex: 1 1 110px;
}

.focus-panel {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--blue-soft) 62%, transparent), transparent 76%),
    var(--surface);
}

.topic-icon {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 12px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.topic-card p {
  color: var(--muted);
}

.topic-card footer {
  display: grid;
  gap: 10px;
  align-self: end;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  max-width: 100%;
  min-height: 26px;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--muted);
  padding: 4px 9px;
  font-size: 0.78rem;
  font-weight: 800;
  overflow-wrap: anywhere;
  white-space: normal;
}

.badge.ready {
  background: var(--green-soft);
  color: var(--green);
}

.badge.soon {
  background: var(--amber-soft);
  color: var(--amber);
}

.badge.premium,
.badge.lifetime {
  background: var(--premium-soft);
  color: var(--premium);
}

.badge.supporter {
  background: var(--teal-soft);
  color: var(--teal);
}

.page-title {
  padding: 18px 0 14px;
}

.page-title.compact h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.progress-panel {
  display: grid;
  grid-template-columns: 1fr minmax(210px, 360px) auto;
  gap: 16px;
  align-items: center;
  margin: 20px 0 24px;
  padding: 16px;
}

.topic-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 18px;
}

.topic-switcher a {
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--muted);
  padding: 8px 10px;
  font-size: 0.9rem;
  font-weight: 750;
  transition: border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.topic-switcher a:hover,
.topic-switcher a.active {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.progress-panel strong {
  display: block;
  font-size: 1.25rem;
}

/* Tananyag, kvíz, szóbeli és feladatoldal közös tartalmi elemei. */
.content-stack {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.study-layout {
  display: grid;
  grid-template-columns: minmax(250px, 300px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.study-sidebar {
  position: sticky;
  top: 92px;
}

.study-sidebar-inner {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 26px rgba(23, 32, 42, 0.05);
  padding: 14px;
}

.study-progress-block {
  position: sticky;
  top: 92px;
  z-index: 2;
  display: grid;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  padding-bottom: 12px;
}

.study-progress-head {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.study-progress-head strong {
  color: var(--primary);
  font-size: 1.35rem;
  line-height: 1;
}

.study-nav {
  display: grid;
  gap: 8px;
}

.study-nav-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: color-mix(in srgb, var(--surface-strong) 58%, transparent);
  overflow: hidden;
}

.study-nav-group summary {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  min-height: 40px;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  padding: 9px 10px;
  font-weight: 850;
}

.study-nav-group summary::-webkit-details-marker {
  display: none;
}

.study-nav-group summary::before {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 180ms ease;
}

.study-nav-group[open] summary::before {
  transform: rotate(45deg);
}

.study-nav-group summary span {
  flex: 1;
}

.study-nav-group summary small {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
}

.study-nav-group.active {
  border-color: color-mix(in srgb, var(--primary) 44%, var(--line));
  background: color-mix(in srgb, var(--blue-soft) 42%, var(--surface));
}

.study-nav-group.done {
  border-color: color-mix(in srgb, var(--green) 36%, var(--line));
}

.study-nav-links {
  display: grid;
  gap: 5px;
  border-top: 1px solid var(--line);
  padding: 8px;
}

.study-sidebar a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) 18px;
  gap: 8px;
  align-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  color: var(--muted);
  padding: 7px 8px;
  font-size: 0.86rem;
  font-weight: 750;
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease, transform 180ms ease;
}

.chapter-index {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 999px;
  background: var(--surface-strong);
  font-size: 0.74rem;
}

.chapter-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-state {
  display: block;
  width: 9px;
  height: 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.study-sidebar a:hover,
.study-sidebar a.active {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--blue-soft) 55%, transparent);
  color: var(--primary);
  transform: translateX(2px);
}

.study-sidebar a.done {
  color: var(--green);
}

.study-sidebar a.done .chapter-index,
.study-sidebar a.done .chapter-state {
  border-color: var(--green);
  background: var(--green-soft);
}

.study-sidebar a.active .chapter-index,
.study-sidebar a.active .chapter-state {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
}

.study-nav-extra {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 8px;
  align-items: center;
  border: 1px dashed color-mix(in srgb, var(--premium) 48%, var(--line));
  border-radius: var(--radius-small);
  background: color-mix(in srgb, var(--premium-soft) 32%, var(--surface));
  color: var(--muted);
  padding: 10px;
  font-size: 0.86rem;
  font-weight: 750;
}

.study-nav-extra small {
  grid-column: 2;
  color: var(--muted);
  font-size: 0.76rem;
}

.study-content {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.study-chapter {
  scroll-margin-top: 110px;
}

.mini-module-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.mini-module,
.study-practice {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  padding: 12px;
}

.study-practice {
  margin-top: 12px;
  border-color: color-mix(in srgb, var(--primary) 34%, var(--line));
}

.study-note-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.study-note {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  padding: 12px;
}

.study-note strong {
  display: block;
  margin-bottom: 6px;
}

.study-note.warning {
  border-color: color-mix(in srgb, var(--amber) 36%, var(--line));
  background: color-mix(in srgb, var(--amber-soft) 32%, var(--surface));
}

.content-card,
.quiz-card,
.task-card,
.thesis-card {
  min-width: 0;
  padding: 20px;
}

.content-card h2,
.content-card h3,
.quiz-card h2,
.task-card h2,
.thesis-card h2 {
  margin-bottom: 12px;
}

.content-card p,
.content-card li,
.task-card p,
.thesis-card p,
.quiz-card p {
  color: var(--muted);
}

.content-card ul,
.content-card ol,
.task-card ul,
.thesis-card ul {
  margin: 10px 0 0;
  padding-left: 22px;
}

.definition-grid,
.concept-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.definition-item,
.concept-item {
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  padding: 12px;
}

.definition-item strong,
.concept-item strong {
  display: block;
  margin-bottom: 4px;
}

.example-grid,
.panic-grid,
.check-grid {
  display: grid;
  gap: 12px;
}

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

.example-item,
.panic-grid section,
.check-grid span,
.callout-line {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  padding: 12px;
}

.example-item {
  display: grid;
  gap: 10px;
}

.example-item pre {
  margin: 0;
}

.flashcard-grid {
  perspective: 1200px;
}

.flashcard-shell {
  display: grid;
  gap: 10px;
}

.flashcard-card {
  min-height: 180px;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
  text-align: left;
  perspective: inherit;
  transition: transform 180ms ease, filter 180ms ease;
}

.flashcard-inner {
  position: relative;
  display: block;
  width: 100%;
  min-height: 180px;
  transform-style: preserve-3d;
  transition: transform 540ms cubic-bezier(0.22, 1, 0.36, 1);
}

.flashcard-card:hover,
.flashcard-card:focus-visible {
  filter: brightness(1.02);
  transform: translateY(-2px);
}

.flashcard-shell.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: center;
  gap: 12px;
  min-height: 180px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: 0 12px 28px rgba(23, 32, 42, 0.06);
  padding: 18px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.flashcard-front strong {
  color: var(--text);
  font-size: 1.35rem;
}

.flashcard-front small {
  color: var(--muted);
}

.flashcard-back {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--green-soft) 50%, transparent), transparent 72%),
    var(--surface);
  transform: rotateY(180deg);
}

.flashcard-actions {
  display: flex;
  gap: 8px;
}

.flashcard-actions .btn {
  flex: 1;
}

.panic-card {
  border-color: color-mix(in srgb, var(--amber) 42%, var(--line));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--amber-soft) 40%, transparent), transparent 48%),
    var(--surface);
}

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

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

.check-grid span {
  color: var(--muted);
}

.callout-line {
  margin: 12px 0;
}

.premium-teaser-card {
  border-color: color-mix(in srgb, var(--premium) 38%, var(--line));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--premium-soft) 40%, transparent), transparent 58%),
    var(--surface);
}

.premium-preview-window {
  position: relative;
  min-height: 180px;
  max-height: 220px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface-strong) 74%, transparent);
  margin-top: 14px;
  padding: 16px 16px 86px;
}

.premium-preview-window ul {
  display: grid;
  gap: 10px;
  margin: 0;
}

.premium-preview-fade {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  display: flex;
  justify-content: flex-start;
  min-height: 96px;
  padding: 42px 16px 16px;
  background:
    linear-gradient(180deg, transparent, color-mix(in srgb, var(--surface) 94%, transparent) 42%, var(--surface));
  backdrop-filter: blur(1px);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  background: rgba(12, 18, 28, 0.48);
  padding: 18px;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-card {
  position: relative;
  width: min(560px, 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 22px;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  color: var(--text);
  font-size: 1.2rem;
}

.account-preview-panel,
.coming-soon-panel {
  display: grid;
  gap: 12px;
  padding-right: 34px;
}

.account-preview-panel p,
.coming-soon-panel p {
  color: var(--muted);
}

.account-note-grid {
  display: grid;
  gap: 10px;
}

.account-note-grid span {
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  color: var(--muted);
  padding: 10px 12px;
}

pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0f1720;
  color: #e7edf5;
  padding: 14px;
  line-height: 1.45;
}

code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.94em;
}

.quiz-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin: 20px 0 14px;
  padding: 14px;
}

.segmented {
  display: inline-grid;
  grid-auto-flow: column;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  padding: 4px;
}

.segmented button {
  min-height: 34px;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--muted);
  padding: 7px 12px;
  font-weight: 800;
}

.segmented button.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 6px 14px rgba(23, 32, 42, 0.08);
}

.quiz-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 14px;
}

.quiz-stage {
  margin-top: 16px;
}

.quiz-card {
  display: grid;
  gap: 16px;
}

.question-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Kvízválaszok finom, de egyértelmű helyes/hibás visszajelzése. */
.answer-list,
.relation-list {
  display: grid;
  gap: 10px;
}

.answer-option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  padding: 12px;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.answer-option:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.answer-option input {
  margin-top: 4px;
}

.answer-option.correct {
  border-color: var(--green);
  background: var(--green-soft);
}

.answer-option.wrong {
  border-color: var(--red);
  background: var(--red-soft);
}

.relation-row {
  display: grid;
  grid-template-columns: minmax(120px, 0.8fr) minmax(180px, 1fr);
  gap: 12px;
  align-items: center;
}

.relation-row select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--text);
  padding: 9px;
}

.text-answer {
  display: grid;
  gap: 8px;
}

.text-answer input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--text);
  padding: 11px 12px;
}

.reset-card {
  border-style: dashed;
}

.simulator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.8fr);
  gap: 14px;
}

.sim-code code {
  display: grid;
  gap: 2px;
}

.sim-code span {
  display: block;
  border-radius: var(--radius-small);
  padding: 2px 6px;
}

.sim-code span.active {
  background: color-mix(in srgb, var(--primary) 34%, transparent);
  color: #ffffff;
}

.sim-panel {
  display: grid;
  gap: 10px;
}

.trace-toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(220px, 1fr);
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
}

.trace-toolbar select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--text);
  padding: 10px 12px;
}

.trace-predict,
.toolbar-task {
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  padding: 12px;
}

.trace-predict strong,
.toolbar-task .badge {
  display: inline-flex;
  margin-bottom: 6px;
}

.trace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.85fr);
  gap: 14px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0;
}

.tool-button {
  display: grid;
  min-height: 78px;
  gap: 5px;
  align-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface-strong);
  color: var(--text);
  padding: 10px;
  text-align: center;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.tool-button strong {
  font-size: 1rem;
}

.tool-button span {
  color: var(--muted);
  font-size: 0.78rem;
}

.tool-button:hover,
.tool-button:focus-visible {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.tool-button.correct {
  border-color: var(--green);
  background: var(--green-soft);
}

.tool-button.wrong {
  border-color: var(--red);
  background: var(--red-soft);
}

.feedback {
  border-radius: var(--radius);
  padding: 12px;
  animation: feedbackPop 220ms ease both;
}

.feedback.correct {
  background: var(--green-soft);
  color: var(--green);
}

.feedback.wrong {
  background: var(--red-soft);
  color: var(--red);
}

@keyframes feedbackPop {
  from {
    opacity: 0;
    transform: scale(0.98);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.quiz-actions,
.timer-actions,
.generator-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.exam-board {
  display: grid;
  grid-template-columns: minmax(230px, 0.7fr) minmax(280px, 1fr);
  gap: 16px;
  margin: 20px 0 24px;
}

.timer-panel,
.generator-panel {
  padding: 18px;
}

.timer-panel strong {
  display: block;
  margin: 4px 0 12px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 2.4rem;
}

.task-card details {
  margin-top: 14px;
}

.task-card summary {
  color: var(--primary);
  cursor: pointer;
  font-weight: 800;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  padding: 22px;
  text-align: center;
}

/* Mobil töréspontok: a navigáció törhet, de vízszintes görgetés ne jelenjen meg. */
@media (max-width: 920px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }

  .brand {
    min-width: 0;
  }

  .main-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .topbar-actions {
    grid-column: 2;
    grid-row: 1;
  }

  .hero-band,
  .exam-board,
  .study-layout,
  .premium-overview {
    grid-template-columns: 1fr;
  }

  .study-sidebar {
    position: sticky;
    top: 108px;
    z-index: 12;
  }

  .study-sidebar-inner {
    gap: 10px;
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    backdrop-filter: blur(14px);
  }

  .study-progress-block {
    position: static;
  }

  .study-nav {
    gap: 6px;
  }

  .study-chapter {
    scroll-margin-top: 230px;
  }

  .stats-grid,
  .topic-grid,
  .dashboard-actions,
  .planner-summary,
  .planner-grid,
  .example-grid,
    .flashcard-grid,
    .mini-module-grid,
    .study-note-grid,
    .panic-grid,
    .check-grid,
    .simulator-grid,
    .trace-grid,
    .trace-toolbar,
    .tool-grid,
    .premium-plan-grid,
    .feature-teaser-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .progress-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 24px, var(--max-width));
    padding-top: 24px;
  }

  .brand span:last-child {
    display: none;
  }

  h1 {
    font-size: 2rem;
  }

  .study-sidebar {
    top: 96px;
  }

  .study-sidebar-inner {
    padding: 10px;
  }

  .study-progress-head strong {
    font-size: 1.1rem;
  }

  .study-nav-group summary {
    min-height: 36px;
    padding: 8px;
  }

  .study-sidebar a {
    grid-template-columns: 22px minmax(0, 1fr) 14px;
    padding: 6px;
  }

  .schema-visual {
    min-height: 280px;
    padding: 18px;
  }

  .stats-grid,
  .topic-grid,
  .dashboard-actions,
  .planner-summary,
  .planner-grid,
  .definition-grid,
  .concept-grid,
    .example-grid,
    .flashcard-grid,
    .mini-module-grid,
    .study-note-grid,
    .panic-grid,
    .check-grid,
    .simulator-grid,
    .trace-grid,
    .trace-toolbar,
    .tool-grid,
    .premium-plan-grid,
    .feature-teaser-row {
    grid-template-columns: 1fr;
  }

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

  .segmented {
    width: 100%;
    grid-auto-flow: row;
  }

  .quiz-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .quiz-toolbar .btn {
    width: 100%;
  }

  .relation-row {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}