.flashvard-body {
  background:
    radial-gradient(circle at 8% 14%, rgba(184, 217, 255, 0.55), transparent 28rem),
    radial-gradient(circle at 88% 2%, rgba(255, 217, 90, 0.32), transparent 24rem),
    linear-gradient(135deg, #fffaf2 0%, #f7fbff 46%, #fff7fa 100%);
}

.flashvard-body.dark {
  --ink: #f3f6fb;
  --muted: #aeb8c6;
  --paper: #10141d;
  --surface: #171d29;
  --line: #2a3342;
  background:
    radial-gradient(circle at 8% 14%, rgba(58, 94, 145, 0.32), transparent 28rem),
    radial-gradient(circle at 88% 2%, rgba(244, 111, 97, 0.16), transparent 24rem),
    #10141d;
}

.flashvard-nav-link {
  color: #0d7a5f;
  background: rgba(216, 234, 211, 0.42);
}

.flashvard-app {
  width: min(1480px, calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(28px, 5vw, 68px) 0 70px;
}

.flash-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: clamp(22px, 4vw, 46px);
  align-items: stretch;
  margin-bottom: 24px;
}

.flash-hero > div,
.flash-onboarding,
.flash-stats article,
.flash-sidebar .sidebar-card,
.flash-panel {
  border: 1px solid rgba(229, 224, 216, 0.82);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 22px 56px rgba(24, 32, 38, 0.09);
  backdrop-filter: blur(18px);
}

.dark .flash-hero > div,
.dark .flash-onboarding,
.dark .flash-stats article,
.dark .flash-sidebar .sidebar-card,
.dark .flash-panel,
.dark .study-card,
.dark .card-editor,
.dark .game-card,
.dark .note-workflow,
.dark .progress-card,
.dark .library-explainer,
.dark .library-set-card {
  border-color: rgba(83, 98, 122, 0.55);
  background: rgba(23, 29, 41, 0.92);
  box-shadow: 0 22px 56px rgba(0, 0, 0, 0.24);
}

.flash-hero > div {
  min-height: 460px;
  padding: clamp(28px, 5vw, 58px);
  border-radius: 34px;
  position: relative;
  overflow: hidden;
}

.flash-hero > div::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 280px;
  height: 280px;
  border-radius: 46px;
  background:
    linear-gradient(135deg, rgba(18, 125, 123, 0.16), rgba(201, 184, 255, 0.22)),
    repeating-linear-gradient(45deg, transparent 0 12px, rgba(255, 255, 255, 0.34) 12px 18px);
  transform: rotate(10deg);
}

.flash-hero h1 {
  max-width: 840px;
  margin-bottom: 18px;
  font-size: clamp(48px, 9vw, 112px);
  line-height: 0.9;
  letter-spacing: -0.07em;
}

.flash-hero p {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.7;
}

.flash-actions,
.set-actions,
.study-actions,
.game-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.flash-primary,
.flash-secondary,
.set-actions button,
.mode-tabs button,
.sidebar-title button,
.mini-form button,
.study-actions button,
.game-actions button,
.inline-actions button,
.card-tools button,
.danger-button,
.tiny-button {
  min-height: 42px;
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 0 16px;
  background: var(--surface);
  color: var(--ink);
  font: 800 14px "DM Sans", Arial, sans-serif;
  cursor: pointer;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.flash-primary,
.study-actions .correct,
.game-actions .primary-game {
  border-color: #182026;
  background: #182026;
  color: white;
}

.dark .flash-primary,
.dark .study-actions .correct,
.dark .game-actions .primary-game {
  border-color: #f3f6fb;
  background: #f3f6fb;
  color: #10141d;
}

.flash-secondary {
  background: rgba(255, 255, 255, 0.68);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(24, 32, 38, 0.1);
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(18, 125, 123, 0.26);
  outline-offset: 3px;
}

.flash-onboarding {
  padding: 28px;
  border-radius: 30px;
}

.flash-onboarding h2 {
  font-family: "Fraunces", Georgia, serif;
  font-size: 34px;
}

.flash-onboarding ol {
  display: grid;
  gap: 12px;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.55;
  font-weight: 700;
}

.mini-pill,
.tag-pill,
.mastery-pill,
.type-pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  padding: 0 11px;
  background: rgba(216, 234, 211, 0.8);
  color: #0d6c55;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.flash-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.flash-stats article {
  padding: 22px;
  border-radius: 24px;
}

.flash-stats span {
  display: block;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(32px, 5vw, 54px);
  line-height: 1;
}

.flash-stats p {
  margin: 8px 0 0;
  color: var(--muted);
  font-weight: 800;
}

.flash-workbench {
  display: grid;
  grid-template-columns: 350px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.flash-sidebar {
  position: sticky;
  top: 90px;
  display: grid;
  gap: 14px;
}

.flash-sidebar .sidebar-card {
  padding: 18px;
  border-radius: 24px;
}

.library-card p:not(.eyebrow) {
  color: var(--muted);
  line-height: 1.55;
}

.sidebar-card label,
.form-grid label,
.card-editor label,
.note-workflow label,
.mini-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink);
  font: 700 15px "DM Sans", Arial, sans-serif;
}

.dark input,
.dark textarea,
.dark select {
  background: rgba(255, 255, 255, 0.06);
}

input,
select {
  min-height: 46px;
  padding: 0 13px;
}

textarea {
  min-height: 120px;
  padding: 14px;
  line-height: 1.55;
  resize: vertical;
}

.mini-form > div,
.filter-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  margin-top: 8px;
}

.filter-row {
  grid-template-columns: 1fr 1fr;
  margin-top: 10px;
}

.sidebar-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sidebar-title h2,
.account-card h2 {
  margin: 0;
  font-size: 21px;
}

.sidebar-title button {
  width: 42px;
  padding: 0;
  font-size: 22px;
}

.set-list {
  display: grid;
  gap: 10px;
  max-height: 560px;
  overflow: auto;
  padding-right: 4px;
}

.set-item {
  display: grid;
  gap: 7px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.64);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.dark .set-item {
  background: rgba(255, 255, 255, 0.05);
}

.set-item.active {
  border-color: rgba(18, 125, 123, 0.45);
  background: rgba(216, 234, 211, 0.5);
}

.dark .set-item.active {
  background: rgba(18, 125, 123, 0.22);
}

.set-item strong {
  font-size: 16px;
}

.set-item span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.flash-panel {
  min-height: 720px;
  padding: clamp(18px, 3vw, 30px);
  border-radius: 30px;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 620px;
  text-align: center;
}

.empty-state h2 {
  max-width: 560px;
  font-size: clamp(38px, 7vw, 72px);
}

.empty-state p {
  max-width: 560px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.set-topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.set-topbar h2 {
  margin: 0;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(34px, 5vw, 58px);
  letter-spacing: -0.04em;
}

.set-topbar p {
  margin: 8px 0 0;
  color: var(--muted);
}

.set-actions {
  justify-content: flex-end;
}

.mode-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 18px 0;
}

.mode-tabs button {
  flex: 0 0 auto;
  background: transparent;
}

.mode-tabs button.active {
  border-color: rgba(18, 125, 123, 0.36);
  background: rgba(216, 234, 211, 0.75);
  color: #0d6c55;
}

.mode-content {
  min-height: 480px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.form-grid label.full,
.card-editor label.full,
.span-full {
  grid-column: 1 / -1;
}

.editor-toolbar,
.content-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.editor-toolbar h3,
.content-header h3 {
  margin: 0;
  font-size: 24px;
}

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

.card-editor,
.study-card,
.game-card,
.note-workflow,
.progress-card,
.inline-card,
.test-question,
.library-explainer,
.library-set-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.66);
}

.library-explainer {
  margin-bottom: 16px;
  background:
    linear-gradient(135deg, rgba(216, 234, 211, 0.68), rgba(184, 217, 255, 0.35)),
    rgba(255, 255, 255, 0.66);
}

.library-explainer h3,
.library-set-card h3 {
  margin-bottom: 8px;
}

.library-explainer p,
.library-set-card p {
  color: var(--muted);
  line-height: 1.55;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.library-set-card {
  display: grid;
  gap: 10px;
}

.card-editor {
  display: grid;
  gap: 12px;
}

.card-editor-grid {
  display: grid;
  grid-template-columns: 150px 1fr 1fr;
  gap: 10px;
}

.card-tools {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

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

.danger-button,
.study-actions .wrong {
  color: #9b2f24;
  border-color: rgba(244, 111, 97, 0.42);
  background: rgba(244, 111, 97, 0.12);
}

.study-shell {
  display: grid;
  gap: 18px;
}

.study-card {
  display: grid;
  gap: 18px;
  min-height: 390px;
  align-content: center;
  text-align: center;
}

.study-card h3 {
  margin: 0 auto;
  max-width: 780px;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(34px, 6vw, 66px);
  line-height: 1.05;
}

.study-card p {
  max-width: 760px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.6;
}

.study-actions {
  justify-content: center;
}

.progress-line {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(18, 125, 123, 0.12);
}

.progress-line span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--coral));
  transition: width 240ms ease;
}

.note-workflow {
  display: grid;
  gap: 16px;
}

.note-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  gap: 16px;
}

.note-upload {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.generated-list,
.inline-list,
.game-board,
.progress-grid,
.test-list {
  display: grid;
  gap: 12px;
}

.generated-card {
  display: grid;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: rgba(255, 250, 242, 0.74);
}

.dark .generated-card {
  background: rgba(255, 255, 255, 0.04);
}

.generated-card strong {
  font-size: 17px;
}

.generated-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.inline-text {
  line-height: 1.95;
  color: var(--muted);
}

.concept-chip {
  display: inline;
  border: 0;
  border-radius: 9px;
  padding: 2px 5px;
  background: rgba(255, 217, 90, 0.42);
  color: var(--ink);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.inline-card {
  display: grid;
  gap: 8px;
}

.game-picker {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.game-picker button {
  min-height: 120px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink);
  text-align: left;
  padding: 16px;
}

.dark .game-picker button {
  background: rgba(255, 255, 255, 0.05);
}

.game-picker strong {
  display: block;
  font-size: 18px;
  margin-bottom: 8px;
}

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

.game-tile {
  min-height: 88px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  padding: 12px;
  font-weight: 900;
}

.dark .game-tile {
  background: rgba(255, 255, 255, 0.05);
}

.game-tile.selected {
  border-color: var(--teal);
  background: rgba(216, 234, 211, 0.72);
}

.game-tile.matched {
  opacity: 0.45;
  pointer-events: none;
}

.memory-grid .game-tile {
  min-height: 105px;
}

.test-question {
  display: grid;
  gap: 10px;
}

.test-question h4 {
  margin: 0;
  font-size: 18px;
}

.choice-row {
  display: grid;
  gap: 8px;
}

.choice-row label {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  font-weight: 800;
  text-transform: none;
  letter-spacing: 0;
}

.choice-row input {
  width: auto;
  min-height: auto;
}

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

.progress-card h3 {
  margin-bottom: 8px;
}

.progress-card strong {
  font-family: "Fraunces", Georgia, serif;
  font-size: 42px;
}

.difficulty-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.flash-toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 50;
  max-width: min(420px, calc(100% - 44px));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
  background: var(--ink);
  color: white;
  box-shadow: 0 18px 44px rgba(24, 32, 38, 0.18);
  font-weight: 800;
}

.keyboard-help {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.empty-mini {
  border: 1px dashed var(--line);
  border-radius: 22px;
  padding: 28px;
  color: var(--muted);
  text-align: center;
}

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

@media (max-width: 1180px) {
  .flash-hero,
  .flash-workbench,
  .note-grid {
    grid-template-columns: 1fr;
  }

  .flash-sidebar {
    position: static;
  }

  .set-topbar {
    grid-template-columns: 1fr;
  }

  .set-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 820px) {
  .flashvard-app {
    width: min(100% - 20px, 1480px);
    padding-top: 18px;
  }

  .flash-hero > div {
    min-height: auto;
  }

  .flash-stats,
  .form-grid,
  .card-editor-grid,
  .game-picker,
  .progress-grid,
  .library-grid,
  .match-grid,
  .memory-grid {
    grid-template-columns: 1fr;
  }

  .site-header.flashvard-header {
    grid-template-columns: 1fr;
  }

  .site-header.flashvard-header nav {
    justify-content: flex-start;
    overflow-x: auto;
  }
}