:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --text: #111827;
  --muted: #667085;
  --line: #e5e7eb;
  --line-strong: #d0d5dd;
  --accent: #0f766e;
  --accent-soft: #ecfdf5;
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --shadow: 0 8px 24px rgba(16, 24, 40, 0.05);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

body.onboarding-active .page-shell {
  filter: blur(6px);
  pointer-events: none;
  user-select: none;
}

.matrix-tooltip.hidden {
  display: none;
}

.hidden {
  display: none;
}

.matrix-tooltip {
  position: fixed;
  z-index: 200;
  max-width: min(180px, calc(100vw - 16px));
  padding: 6px 8px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  background: #e5e7eb;
  color: #374151;
  font-size: 0.72rem;
  line-height: 1.25;
  text-align: center;
  box-shadow: 0 8px 18px rgba(17, 24, 39, 0.12);
  pointer-events: none;
  overflow-wrap: break-word;
}

a {
  color: inherit;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
.button-like {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  transition: border-color 140ms ease, background 140ms ease;
}

button:hover,
.button-like:hover {
  border-color: var(--line-strong);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.primary-button,
.tab.is-active,
.success-button {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.secondary-button {
  background: #fff7ed;
  border-color: #fdba74;
  color: #c2410c;
}

.danger-button {
  background: #dc2626;
  border-color: #dc2626;
  color: #ffffff;
}

.subtle {
  background: var(--surface-soft);
}

.page-shell {
  min-height: 100vh;
  width: min(1280px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 20px 0 12px;
  display: flex;
  flex-direction: column;
}

.app-footer {
  margin-top: auto;
  padding: 12px 4px 20px;
  color: #9ca3af;
  font-size: 0.76rem;
  line-height: 1.5;
  text-align: center;
}

.app-footer p {
  margin: 0;
}

.app-footer a {
  color: inherit;
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

.footer-separator {
  display: inline-block;
  margin: 0 0.3rem;
}

.crossed-out {
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
  text-decoration-color: #dc2626;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.topbar-title {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topbar h1 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero-copy,
.catalog-copy,
.helper-copy {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.5;
}

.utility-drawer {
  position: relative;
  flex: 0 0 auto;
}

.utility-drawer summary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 0.7rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.utility-drawer summary::-webkit-details-marker {
  display: none;
}

.utility-drawer[open] summary {
  border-color: var(--line-strong);
}

.drawer-caret {
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg) translateY(-1px);
  transition: transform 140ms ease;
}

.utility-drawer[open] .drawer-caret {
  transform: rotate(225deg) translateY(-1px);
}

.utility-content {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 20;
  width: 320px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 16px 40px rgba(16, 24, 40, 0.12);
}

.settings-group {
  padding: 14px;
  border: 1px solid #edf2f7;
  border-radius: 12px;
  background: #fbfcfe;
}

.settings-heading {
  margin-bottom: 12px;
}

.settings-heading h2 {
  font-size: 0.88rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(228px, 252px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  min-width: 0;
}

.sidebar-column {
  display: grid;
  gap: 16px;
  align-self: start;
}

.panel,
.subpanel,
.metric-card,
.question-card,
.empty-state,
.dashboard-overview {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  min-width: 0;
}

.panel {
  padding: 18px;
}

#dashboard-view {
  gap: 12px;
}

.sidebar-panel {
  position: sticky;
  top: 16px;
}

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

.feedback-panel {
  padding: 18px;
}

.progression-panel {
  position: relative;
  overflow: hidden;
  padding-bottom: 0;
}

.progression-header {
  position: relative;
  min-height: 72px;
}

.progression-level {
  display: flex;
  align-items: center;
  gap: 12px;
}

.current-level-emoji {
  font-size: 2.6rem;
  line-height: 1;
}

.progression-copy strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.progression-copy .helper-copy {
  margin-top: 2px;
}

.level-confetti {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  top: 14px;
  left: var(--x);
  width: 8px;
  height: 12px;
  border-radius: 2px;
  background: var(--color);
  opacity: 0;
  transform: translate(-50%, 0) rotate(var(--rotation));
  animation: sidebar-confetti var(--duration) ease-out forwards;
  animation-delay: var(--delay);
}

.stack {
  display: grid;
  gap: 20px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.section-heading h2,
.section-heading h3,
.section-heading h4 {
  margin: 0;
  font-size: 0.98rem;
}

.compact-heading {
  margin-bottom: 8px;
}

.sidebar-heading h2 {
  font-size: 0.9rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.6rem;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 0.76rem;
  font-weight: 700;
  white-space: nowrap;
}

.section-badge.part-1 {
  background: #e0f2fe;
  color: #0369a1;
}

.section-badge.part-2 {
  background: #f3e8ff;
  color: #7e22ce;
}

.section-badge.part-3 {
  background: #ccfbf1;
  color: #0f766e;
}

.section-badge.part-4 {
  background: #fff7ed;
  color: #c2410c;
}

.section-badge.part-5 {
  background: #fef3c7;
  color: #a16207;
}

.section-badge.part-6 {
  background: #fce7f3;
  color: #be185d;
}

.section-badge.part-7 {
  background: #e0e7ff;
  color: #4338ca;
}

.profile-list,
.catalog-list,
#section-stats,
#recent-attempts,
#most-missed,
#unanswered-list,
#dashboard-cards {
  display: grid;
  gap: 12px;
}

.profile-card,
.catalog-item,
.list-card,
.section-row,
.active-profile-panel {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  text-align: left;
}

.profile-card {
  padding: 14px;
}

.profile-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.is-clickable {
  cursor: pointer;
}

.active-profile-panel strong {
  display: block;
  font-size: 0.95rem;
}

.profile-card.is-active {
  border-color: #9fe2d4;
  background: #f0fdfa;
}

.profile-card header,
.catalog-item header,
.section-row header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 6px;
  min-width: 0;
}

.profile-card header > *,
.catalog-item header > *,
.section-row header > * {
  min-width: 0;
}

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

.list-card-head {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.list-card strong,
.catalog-item strong,
.section-row strong {
  min-width: 0;
  overflow-wrap: anywhere;
  line-height: 1.35;
}

.list-card-label,
.catalog-item .pill,
.section-row .pill {
  width: fit-content;
  max-width: min(100%, 100%);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.list-card p,
.catalog-item p,
.section-row p {
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.inline-form,
.field,
.attempt-form,
.compact-form {
  display: grid;
  gap: 12px;
}

.compact-form {
  grid-template-columns: 1fr auto;
  align-items: start;
}

.compact-form button {
  min-width: 72px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.wrap > * {
  flex: 1 1 120px;
}

.settings-group .button-row.wrap > * {
  flex: 1 1 calc(50% - 4px);
}

.field span {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
}

.sidebar-panel > section {
  display: grid;
  gap: 14px;
}

.sidebar-panel .field + .field {
  margin-top: 4px;
}

.sidebar-panel .primary-button {
  margin-top: 2px;
}

.feedback-form {
  display: grid;
  gap: 10px;
}

.feedback-form textarea {
  min-height: 104px;
}

.feedback-status {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--muted);
}

.feedback-status.is-success {
  color: #166534;
}

.feedback-status.is-error {
  color: #b42318;
}

.feedback-status.is-pending {
  color: #0f766e;
}

.progression-track-wrap {
  display: grid;
  gap: 8px;
}

.progression-track-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.next-level-emoji {
  font-size: 1.25rem;
  line-height: 1;
}

.xp-track {
  width: 100%;
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7edf3;
}

.xp-progress-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #0f766e 0%, #14b8a6 100%);
  transition: width 260ms ease;
}

.utility-content.stack {
  gap: 14px;
}

.settings-group .compact-form {
  margin-top: 6px;
}

.settings-group .button-row + .button-row,
.settings-group .button-row + .danger-button,
.settings-group .button-row + .button-like,
.settings-group .button-row + button {
  margin-top: 4px;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.78rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
.button-like:focus-visible {
  outline: 2px solid rgba(15, 118, 110, 0.16);
  outline-offset: 1px;
  border-color: var(--accent);
}

textarea {
  resize: vertical;
}

.content {
  min-width: 0;
  overflow-x: clip;
}

.tab-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  padding: 4px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.onboarding-overlay.hidden {
  display: none;
}

.onboarding-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
}

.onboarding-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(37, 99, 235, 0.22);
}

.onboarding-modal {
  position: relative;
  z-index: 1;
  width: min(460px, calc(100vw - 32px));
  padding: 24px;
  border: 1px solid #bfdbfe;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 60px rgba(37, 99, 235, 0.16);
}

.onboarding-modal h2 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.7rem;
  letter-spacing: -0.03em;
}

.onboarding-form {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.tab {
  width: 100%;
  min-width: 0;
  border-radius: 10px;
  border-color: transparent;
  background: transparent;
  font-weight: 700;
}

.view.hidden,
.question-card.hidden,
.empty-state.hidden,
.solution-panel.hidden,
.prompt-note.hidden {
  display: none;
}

#study-view {
  gap: 14px;
}

.question-card,
.empty-state {
  padding: 18px;
}

.study-nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.nav-button {
  min-height: 36px;
  padding: 0.55rem 0.85rem;
}

.empty-state h3,
.question-card h3 {
  margin: 0 0 8px;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
}

.question-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.meta-text {
  color: var(--muted);
  font-size: 0.82rem;
}

.question-status.is-correct {
  background: #ecfdf3;
  color: #166534;
}

.question-status.is-failed {
  background: #fef2f2;
  color: #b42318;
}

.question-status.is-repeat {
  background: #fffbeb;
  color: #b45309;
}

.question-status.is-unseen {
  background: #f3f4f6;
  color: #6b7280;
}

.question-prompt {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.7;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0;
}

.prompt-note {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fffbeb;
  color: #b45309;
  font-size: 0.9rem;
}

.solution-panel {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.question-action-divider {
  height: 1px;
  margin: 14px 0 6px;
  background: var(--line);
}

.side-note-field {
  margin-top: 10px;
}

.study-secondary-actions {
  justify-content: center;
  margin-top: 4px;
}

.study-secondary-actions > * {
  flex: 0 1 auto;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: "Manrope", sans-serif;
  line-height: 1.6;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0, "dlig" 0;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}

.dashboard-overview {
  padding: 12px;
}

.matrix-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.matrix-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  color: var(--muted);
  font-size: 0.82rem;
}

.matrix-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.matrix-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: #d1d5db;
  border: 1px solid rgba(17, 24, 39, 0.06);
}

.matrix-dot.correct {
  background: #16a34a;
}

.matrix-dot.failed {
  background: #dc2626;
}

.matrix-dot.repeat {
  background: #f59e0b;
}

.question-matrix {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 6px;
}

.question-matrix-compact {
  gap: 4px;
}

.dashboard-question-matrix {
  grid-template-columns: repeat(10, 16px);
  gap: 4px;
  width: max-content;
}

.matrix-cell {
  display: block;
  aspect-ratio: 1;
  min-width: 18px;
  min-height: 18px;
  position: relative;
  overflow: visible;
  padding: 0;
  border-radius: 4px;
  background: #d1d5db;
  border: 1px solid rgba(17, 24, 39, 0.05);
  color: transparent;
  user-select: none;
}
.matrix-cell.is-compact {
  min-width: 12px;
  min-height: 12px;
  border-radius: 3px;
}

.dashboard-question-matrix .matrix-cell {
  width: 16px;
  height: 16px;
  min-width: 16px;
  min-height: 16px;
}

.matrix-cell::after {
  content: "";
  position: absolute;
  right: 1px;
  bottom: 1px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 6px 6px;
  border-color: transparent transparent var(--section-marker, #9ca3af) transparent;
}

.matrix-cell.is-compact::after {
  right: 0;
  bottom: 0;
  border-width: 0 0 5px 5px;
}

.matrix-cell.is-correct::before,
.matrix-cell.is-repeat::before,
.matrix-cell.is-failed::before {
  content: "";
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 96% 96%;
}

.matrix-cell.is-correct::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Ccircle cx='6.6' cy='7.3' r='1.55' fill='white'/%3E%3Ccircle cx='13.4' cy='7.3' r='1.55' fill='white'/%3E%3Cpath d='M5.1 11.7c1.45 1.9 3.1 2.8 4.9 2.8s3.45-.9 4.9-2.8' fill='none' stroke='white' stroke-width='2.05' stroke-linecap='round'/%3E%3C/svg%3E");
}

.matrix-cell.is-repeat::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Ccircle cx='6.6' cy='7.3' r='1.55' fill='white'/%3E%3Ccircle cx='13.4' cy='7.3' r='1.55' fill='white'/%3E%3Cpath d='M5.4 12.4h9.2' fill='none' stroke='white' stroke-width='2.05' stroke-linecap='round'/%3E%3C/svg%3E");
}

.matrix-cell.is-failed::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Ccircle cx='6.6' cy='7.3' r='1.55' fill='white'/%3E%3Ccircle cx='13.4' cy='7.3' r='1.55' fill='white'/%3E%3Cpath d='M5.1 14.6c1.45-1.9 3.1-2.8 4.9-2.8s3.45.9 4.9 2.8' fill='none' stroke='white' stroke-width='2.05' stroke-linecap='round'/%3E%3C/svg%3E");
}

.matrix-cell.is-correct {
  background: #16a34a;
}

.matrix-cell.is-failed {
  background: #dc2626;
}

.matrix-cell.is-repeat {
  background: #f59e0b;
}

@keyframes sidebar-confetti {
  0% {
    opacity: 0;
    transform: translate(-50%, -6px) rotate(var(--rotation));
  }

  15% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: translate(-50%, 62px) rotate(calc(var(--rotation) * 1.6));
  }
}

.metric-card {
  padding: 12px;
}

.metric-label {
  margin: 0 0 4px;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.metric-value {
  display: block;
  margin-top: 2px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.35rem;
}

.metric-footnote {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

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

.subpanel {
  padding: 12px;
}

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

.progress-bar {
  overflow: hidden;
  height: 8px;
  border-radius: 999px;
  background: #e5e7eb;
}

.progress-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #0f766e 0%, #14b8a6 100%);
}

.catalog-item p,
.list-card p,
.section-row p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.catalog-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin: 10px 0;
}

.open-question-button {
  min-height: 34px;
  padding: 0.45rem 0.8rem;
}

@media (max-width: 980px) {
  .topbar,
  .app-grid,
  .split-grid,
  .metric-grid {
    grid-template-columns: 1fr;
    flex-direction: column;
  }

  .utility-drawer,
  .sidebar-panel,
  .sidebar-column {
    position: static;
    width: 100%;
  }

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

  .matrix-header {
    flex-direction: column;
  }
}