:root {
  --bg: #1d1d1b;
  --text: #f8f2de;
  --muted: #ecdcbf;
  --accent: #a31d1d;
  --panel: #262623;
  --line: #3c3b35;
  --ok: #4ca368;
  --error: #d55757;
  --warning: #e2b648;
  --idle: #8a7f63;
  --surface-shell: rgba(29, 29, 27, 0.98);
  --surface-card: rgba(34, 33, 30, 0.96);
  --surface-card-strong: rgba(38, 38, 35, 0.98);
  --surface-card-soft: rgba(20, 20, 18, 0.7);
  --surface-card-subtle: rgba(20, 20, 18, 0.58);
  --surface-muted: rgba(14, 14, 12, 0.35);
  --surface-overlay: rgba(10, 10, 10, 0.72);
  --surface-input: #141412;
  --surface-chip: rgba(0, 0, 0, 0.18);
  --surface-image: rgba(0, 0, 0, 0.32);
  --border-soft: rgba(60, 59, 53, 0.45);
  --ok-bg: rgba(76, 163, 104, 0.2);
  --ok-text: #b9f5c6;
  --error-bg: rgba(213, 87, 87, 0.22);
  --error-text: #ffd0d0;
  --warning-bg: rgba(226, 182, 72, 0.22);
  --warning-text: #ffe2a3;
  --idle-bg: rgba(138, 127, 99, 0.2);
  --shadow: 0 12px 24px rgba(0, 0, 0, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Trebuchet MS", "Gill Sans", sans-serif;
  line-height: 1.45;
  background:
    radial-gradient(circle at 10% -10%, rgba(163, 29, 29, 0.18), transparent 35%),
    radial-gradient(circle at 100% 0%, rgba(236, 220, 191, 0.1), transparent 28%),
    var(--bg);
  color: var(--text);
}

a {
  color: var(--muted);
}

a:hover {
  color: var(--text);
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.app-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface-shell);
  position: sticky;
  top: 0;
  z-index: 5;
  padding-top: env(safe-area-inset-top);
}

.nav-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand-header {
  height: 34px;
  width: auto;
  border-radius: 6px;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.inline-form {
  margin: 0;
  display: inline-flex;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  min-height: 44px;
  font-size: 0.92rem;
  background: var(--surface-card);
  transition: border-color 120ms ease, transform 120ms ease;
}

.user-pill {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  min-height: 44px;
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 0.9rem;
}

.main-nav a:hover {
  border-color: var(--muted);
  transform: translateY(-1px);
}

.page {
  padding: 1.35rem 0 2.2rem;
}

.breadcrumb {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

h1 {
  margin: 0 0 0.7rem;
  font-size: 1.9rem;
}

h2,
h3 {
  margin: 1.2rem 0 0.7rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-card);
  padding: 1rem;
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.card p {
  margin: 0.45rem 0;
}

.page > section.card + section.card,
.page > section.module-hub + section.card,
.page > section.card + section.module-hub,
.page > section.module-hub + section.module-hub {
  margin-top: 1rem;
}

.dashboard-stack {
  display: grid;
  gap: 1rem;
}

.home-hero {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(220px, 340px) 1fr;
  align-items: center;
}

.home-hero img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.feedback-question-preview summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-weight: 600;
}

.feedback-question-preview-text {
  min-width: 0;
}

.feedback-question-preview-hint {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.feedback-question-preview-body {
  margin-top: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--line);
}

.feedback-question-options {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
}

.feedback-question-options li + li {
  margin-top: 0.3rem;
}

.btn,
button {
  background: var(--accent);
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.55rem 0.95rem;
  min-height: 44px;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

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

.btn:disabled,
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

.btn.link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

form {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 1rem;
}

label {
  font-weight: 600;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.6rem;
  background: var(--surface-input);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.input-validation-error {
  border-color: var(--error);
}

.field-validation-error,
.validation-summary-errors {
  color: var(--error-text);
}

.field-validation-error {
  display: block;
  font-size: 0.9rem;
}

.field-validation-valid {
  display: none;
}

.validation-summary-errors {
  border: 1px solid var(--error);
  border-radius: 8px;
  background: var(--error-bg);
  padding: 0.7rem 0.85rem;
  margin: 0 0 1rem;
}

.validation-summary-errors ul {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
}

.form-hint {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.table-caption {
  caption-side: top;
  text-align: left;
  margin-bottom: 0.45rem;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
}

.topic-checkbox-list {
  display: grid;
  gap: 0.45rem;
}

.topic-group-list {
  display: grid;
  gap: 0.65rem;
}

.topic-group-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(20, 20, 18, 0.38);
  padding: 0.55rem;
}

.topic-group-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
}

.topic-group-card .topic-checkbox-list {
  margin-top: 0.6rem;
}

.topic-select-all {
  padding: 0.35rem 0.65rem;
  min-height: 36px;
  font-size: 0.82rem;
}

.topic-checkbox-item {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 500;
}

.topic-checkbox-input {
  margin: 0;
}

input:focus,
select:focus,
textarea:focus,
button:focus,
a:focus,
summary:focus {
  outline: 2px solid var(--muted);
  outline-offset: 2px;
}

textarea {
  min-height: 96px;
}

.hidden {
  display: none !important;
}

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

.media-context-block {
  margin-top: 0.8rem;
  border-top: 1px solid var(--line);
  padding-top: 0.9rem;
}

.media-zone-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.media-zone-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem;
  background: var(--surface-card-subtle);
}

.media-zone-card h4 {
  margin: 0 0 0.45rem;
}

.media-zone-card.disabled {
  opacity: 0.6;
}

.media-zone-note {
  margin: 0.15rem 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.inline-option {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.inline-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.result-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.result-tag {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--surface-chip);
}

.result-tag.is-on {
  border-color: var(--ok);
  color: var(--ok-text);
  background: var(--ok-bg);
}

.pager {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.65rem;
  margin-top: 0.9rem;
}

.pager-status {
  color: var(--muted);
  font-size: 0.9rem;
}

.btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.media-thumb {
  display: block;
  max-width: 100%;
  width: min(220px, 100%);
  max-height: 140px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-input);
  margin-top: 0.35rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.7rem;
}

th,
td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 0.55rem;
}

th {
  color: var(--muted);
}

.alert {
  border-radius: 8px;
  padding: 0.7rem 0.85rem;
  margin: 0.7rem 0 1rem;
  border: 1px solid;
}

.alert.error {
  border-color: var(--error);
  background: var(--error-bg);
}

.alert.ok,
.alert.success {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.subtle {
  color: var(--muted);
  font-size: 0.92rem;
}

.empty {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 0.8rem;
  color: var(--muted);
}

details {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 0.6rem;
  margin-top: 0.6rem;
}

summary {
  cursor: pointer;
  color: var(--muted);
  font-weight: 600;
}

.attempt-sticky {
  position: sticky;
  top: 72px;
  z-index: 4;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-card-strong);
  padding: 0.8rem;
  margin-bottom: 1rem;
}

.attempt-sticky-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.question-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.question-nav-wrap {
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 0.55rem;
  max-height: 168px;
  overflow: auto;
  background: var(--surface-muted);
}

.question-nav-item {
  min-width: 44px;
  min-height: 44px;
  padding: 0.38rem 0.58rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.question-nav-item.is-answered {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.question-nav-item.is-blank {
  border-color: var(--idle);
  background: var(--idle-bg);
}

.question-nav-item.is-blank-review {
  border-color: var(--line);
  background: transparent;
}

.question-nav-item.is-correct {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.question-nav-item.is-wrong {
  border-color: var(--error);
  background: var(--error-bg);
}

.question-nav-item.is-flagged {
  border-color: var(--warning);
  background: var(--warning-bg);
}

.question-nav-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.65rem;
}

.result-tag.is-flagged {
  border-color: var(--warning);
  color: var(--warning-text);
  background: var(--warning-bg);
}

.result-tag.is-wrong {
  border-color: var(--error);
  color: var(--error-text);
  background: var(--error-bg);
}

.attempt-question + .attempt-question {
  margin-top: 1.2rem;
  padding-top: 1.2rem;
  border-top: 1px dashed var(--line);
}

.question-statement {
  scroll-margin-top: 170px;
}

.attempt-options {
  display: grid;
  gap: 0.4rem;
}

.attempt-options-group {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.attempt-option {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.attempt-option > span {
  display: grid;
  gap: 0.3rem;
}

.attempt-option input[type="radio"] {
  width: auto;
  margin: 0;
}

.attempt-flag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.7rem;
}

.attempt-message {
  min-height: 1.3rem;
}

.attempt-message.is-error {
  color: var(--error-text);
}

.attempt-flag input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.review-options {
  display: grid;
  gap: 0.45rem;
  margin: 0.5rem 0 0.7rem;
}

.review-option {
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
  gap: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  background: var(--surface-card-soft);
}

.review-option-content {
  display: grid;
  gap: 0.3rem;
}

.review-option-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.review-option.is-correct {
  border-color: var(--ok);
  background: var(--ok-bg);
  color: var(--ok-text);
}

.review-option.is-wrong-selected {
  border-color: var(--error);
  background: var(--error-bg);
  color: var(--error-text);
}

.review-option-icon {
  font-size: 1.05rem;
}

.review-blank-note {
  color: var(--warning);
  font-weight: 700;
}

.question-media-stack {
  display: grid;
  gap: 0.35rem;
}

.statement-media-stack {
  margin: 0.35rem 0 0.55rem;
}

.option-media-stack {
  margin-top: 0.1rem;
}

.explanation-media-stack {
  margin: 0.35rem 0 0.55rem;
}

.question-context-image {
  display: block;
  width: min(100%, 360px);
  max-width: 100%;
  max-height: 220px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-image);
}

.option-context-image {
  width: min(100%, 300px);
  max-height: 180px;
}

.timeout-modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
}

.timeout-modal[hidden] {
  display: none !important;
}

.timeout-modal-backdrop {
  position: absolute;
  inset: 0;
  background: var(--surface-overlay);
}

.timeout-modal-panel {
  position: relative;
  width: min(540px, 92vw);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-card-strong);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
}

.subsection-card {
  border: 1px dashed var(--line);
  border-radius: 12px;
  background: var(--surface-muted);
  padding: 0.9rem;
}

.module-hub {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.module-card {
  display: grid;
  gap: 0.75rem;
  align-content: start;
  background: var(--surface-card);
  border-top: 3px solid var(--accent);
}

.module-card h2 {
  margin: 0;
}

.module-card p {
  margin: 0;
}

.module-card .actions {
  margin-top: auto;
}

.auth-shell {
  display: grid;
  place-items: start;
}

.auth-card {
  width: min(100%, 38rem);
  background:
    linear-gradient(180deg, rgba(163, 29, 29, 0.08), transparent 28%),
    var(--surface-card);
}

.auth-card-compact {
  padding: 1.2rem;
}

.auth-kicker {
  margin: 0 0 0.45rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
  font-weight: 700;
}

.auth-form {
  margin-top: 1rem;
}

.auth-actions {
  align-items: center;
}

.auth-note {
  margin-top: 0.8rem;
}

.auth-inline-link {
  margin: 0.15rem 0 0.1rem;
  font-size: 0.9rem;
}

.auth-inline-link a {
  text-decoration: underline;
  text-underline-offset: 0.16rem;
}

.status-inline {
  font-weight: 700;
}

.status-inline.warning {
  color: var(--warning);
}

.status-inline.ok {
  color: var(--ok-text);
}

@media (max-width: 980px) {
  .home-hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .brand {
    width: 100%;
  }

  .brand-header {
    height: 30px;
  }

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

  .main-nav a {
    width: 100%;
  }

  .responsive-table {
    border: 0;
    margin-top: 0.9rem;
  }

  .responsive-table thead {
    display: none;
  }

  .responsive-table,
  .responsive-table tbody,
  .responsive-table tr,
  .responsive-table td {
    display: block;
    width: 100%;
  }

  .responsive-table tbody {
    display: grid;
    gap: 0.85rem;
  }

  .responsive-table tr {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 0.8rem;
    background: var(--surface-card-soft);
  }

  .responsive-table td {
    display: grid;
    grid-template-columns: minmax(8.5rem, 42%) minmax(0, 1fr);
    gap: 0.7rem;
    align-items: start;
    padding: 0.35rem 0;
    border-bottom: 1px solid var(--border-soft);
    overflow-wrap: anywhere;
  }

  .responsive-table td:last-child {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .responsive-table td::before {
    content: attr(data-label);
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.01em;
  }

  .responsive-table td > .actions {
    margin-top: 0;
  }

  .responsive-table .inline-form {
    display: grid;
    gap: 0.55rem;
  }

  .responsive-table .inline-form select,
  .responsive-table .inline-form button,
  .responsive-table .inline-form .btn,
  .responsive-table td form button,
  .responsive-table td .btn {
    width: 100%;
  }

  .attempt-sticky {
    position: static;
    top: auto;
    padding: 0.9rem;
  }

  .attempt-sticky-row {
    display: grid;
    gap: 0.55rem;
  }

  .attempt-sticky .actions > * {
    flex: 1 1 100%;
  }

  .question-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(44px, 1fr));
    gap: 0.55rem;
  }

  .question-nav-wrap {
    max-height: 200px;
  }

  .question-nav-item {
    width: 100%;
  }

  .question-statement {
    scroll-margin-top: 96px;
  }
}