/*
 * Inspector EMT · interfaz v0.19.2
 * Azul corporativo EMT Madrid: Pantone 286 C / #0033A0.
 * El archivo se carga al final para modernizar la presentación sin alterar
 * la estructura, los contenidos ni el comportamiento de la aplicación.
 */

:root {
  --ink: #15213a;
  --forest: #0033a0;
  --green: #0072ce;
  --mint: #e8f2ff;
  --cream: #f4f7fb;
  --paper: #ffffff;
  --line: #d8e2f0;
  --red: #b42318;
  --gold: #a15c00;
  --emt-blue: #0033a0;
  --emt-blue-dark: #002675;
  --emt-blue-bright: #0072ce;
  --emt-blue-soft: #e8f2ff;
  --emt-sky: #f2f7ff;
  --muted: #5f6f86;
  --shadow-sm: 0 5px 18px rgba(18, 42, 82, .07);
  --shadow-md: 0 16px 46px rgba(18, 42, 82, .11);
  --shadow-blue: 0 16px 34px rgba(0, 51, 160, .22);
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  background:
    radial-gradient(circle at 8% 0%, rgba(0, 114, 206, .08), transparent 28rem),
    linear-gradient(180deg, #f8faff 0, var(--cream) 24rem);
  color: var(--ink);
  font-family: Lato, Verdana, Arial, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button,
a,
input,
select,
textarea {
  transition: color .18s ease, background-color .18s ease, border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex="0"]:focus-visible {
  outline: 3px solid #f6b800;
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: .5;
}

.theme-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-width: 44px;
  min-height: 44px;
  padding: 9px 11px;
  border: 1px solid #c8d5e6;
  border-radius: 12px;
  background: #fff;
  color: var(--emt-blue);
  font-size: 12px;
  font-weight: 800;
}

.theme-toggle:hover {
  border-color: #8fb3df;
  background: var(--emt-blue-soft);
  transform: translateY(-1px);
}

.theme-icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-icon-sun {
  display: none;
}

.login-theme-toggle {
  position: fixed;
  z-index: 3;
  top: max(18px, env(safe-area-inset-top));
  right: max(18px, env(safe-area-inset-right));
  border-color: rgba(255, 255, 255, .35);
  background: rgba(255, 255, 255, .13);
  color: #fff;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.login-theme-toggle:hover {
  border-color: rgba(255, 255, 255, .65);
  background: rgba(255, 255, 255, .22);
}

header {
  height: 84px;
  gap: 18px;
  padding-inline: max(22px, calc((100vw - 1360px) / 2));
  border-bottom: 1px solid rgba(163, 181, 208, .55);
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 8px 30px rgba(18, 42, 82, .07);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.brand {
  flex: 0 0 auto;
  gap: 11px;
  margin-right: 0;
  color: var(--emt-blue-dark);
}

.brand span {
  width: 42px;
  height: 42px;
  border-radius: 12px 12px 12px 4px;
  background: linear-gradient(145deg, var(--emt-blue-bright), var(--emt-blue));
  box-shadow: 0 8px 18px rgba(0, 51, 160, .2);
  font: 800 13px/1 Lato, Verdana, sans-serif;
  letter-spacing: .04em;
}

.brand strong {
  font: 800 18px/1.05 Lato, Verdana, sans-serif;
  letter-spacing: -.02em;
}

.main-nav {
  display: flex;
  flex: 1 1 auto;
  gap: 4px;
  min-width: 0;
  padding: 5px;
  overflow-x: auto;
  border: 1px solid #e0e7f1;
  border-radius: 15px;
  background: #f2f5f9;
  scrollbar-width: none;
}

.main-nav::-webkit-scrollbar {
  display: none;
}

.main-nav button {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 9px 11px;
  border-radius: 10px;
  color: #44536a;
  font-size: 13px;
  font-weight: 750;
  white-space: nowrap;
}

.main-nav button:hover {
  background: #fff;
  color: var(--emt-blue);
  box-shadow: var(--shadow-sm);
}

.main-nav button.active,
.main-nav button[aria-current="page"] {
  background: var(--emt-blue);
  color: #fff;
  box-shadow: 0 7px 16px rgba(0, 51, 160, .22);
}

.nav-icon {
  display: inline-grid;
  place-items: center;
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.current-user {
  flex: 0 0 auto;
  max-width: 130px;
  color: var(--ink);
}

.current-user strong,
.current-user small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.current-user small,
.metric small,
.block-card small,
.function-metrics span,
.course-session-card small,
.line-topic-card small {
  color: var(--muted);
}

.quiet,
.back {
  color: #43536a;
  font-weight: 750;
}

.quiet:hover,
.back:hover {
  background: var(--emt-blue-soft);
  color: var(--emt-blue);
}

main {
  max-width: 1220px;
  padding-top: 48px;
}

.hero {
  position: relative;
  gap: 34px;
  margin-bottom: 22px;
  padding: clamp(26px, 5vw, 48px);
  overflow: hidden;
  border-radius: 26px;
  background: linear-gradient(130deg, #002675 0%, #0033a0 54%, #0072ce 100%);
  box-shadow: var(--shadow-blue);
  color: #fff;
}

.hero::before,
.hero::after {
  position: absolute;
  content: "";
  pointer-events: none;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 50%;
}

.hero::before {
  right: -105px;
  top: -145px;
  width: 380px;
  height: 380px;
}

.hero::after {
  right: 90px;
  bottom: -205px;
  width: 330px;
  height: 330px;
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero h1,
.narrow > h1,
.course-heading h1,
.study-heading h1,
.admin-heading h1,
.login-card h1,
.section-head h2,
.question-card h2,
.review-item h3,
.functions-overview-card h2,
.practical-hero h2,
.exam-hero h2 {
  font-family: Lato, Verdana, Arial, sans-serif;
}

.hero h1 {
  max-width: 720px;
  margin-block: 13px 17px;
  font-weight: 850;
  letter-spacing: -.055em;
}

.hero p {
  max-width: 650px;
  color: rgba(255, 255, 255, .82);
  line-height: 1.6;
}

.hero .eyebrow {
  color: #aeddff;
}

.hero-actions {
  min-width: 230px;
}

.hero .primary,
.hero .secondary {
  width: 100%;
  border-color: rgba(255, 255, 255, .32);
}

.hero .primary {
  background: #fff;
  color: var(--emt-blue);
  box-shadow: 0 12px 26px rgba(0, 21, 77, .2);
}

.hero .primary:hover {
  background: #f0f6ff;
  transform: translateY(-1px);
}

.hero .secondary {
  background: rgba(255, 255, 255, .09);
  color: #fff;
}

.hero .secondary:hover {
  background: rgba(255, 255, 255, .18);
}

.eyebrow {
  color: var(--emt-blue-bright);
  letter-spacing: .14em;
}

.primary,
.secondary {
  min-height: 44px;
  border-radius: 11px;
}

.primary {
  background: var(--emt-blue);
  box-shadow: 0 8px 18px rgba(0, 51, 160, .18);
}

.primary:hover {
  background: var(--emt-blue-dark);
  transform: translateY(-1px);
}

.secondary {
  border-color: #aebdd1;
  background: rgba(255, 255, 255, .72);
  color: var(--emt-blue);
}

.secondary:hover {
  border-color: var(--emt-blue-bright);
  background: var(--emt-blue-soft);
}

.metric,
.block-card,
.setup-card,
.question-card,
.course-session-card,
.line-topic-card,
.function-mode-card,
.function-group-card,
.function-map-card,
.practical-card,
.exam-card,
.user-card,
.admin-summary div,
.review-item {
  border-color: var(--line);
  background: rgba(255, 255, 255, .96);
  box-shadow: var(--shadow-sm);
}

.metric {
  position: relative;
  overflow: hidden;
  min-height: 132px;
  padding: 24px;
  border-radius: 17px;
}

.metric::before {
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  content: "";
  background: linear-gradient(90deg, var(--emt-blue), var(--emt-blue-bright));
}

.metric b,
.admin-summary b,
.function-metrics b,
.score {
  color: var(--emt-blue);
  font-family: Lato, Verdana, Arial, sans-serif;
  font-weight: 850;
}

.section-head {
  margin-top: 54px;
}

.section-head h2 {
  color: #18243b;
  font-weight: 820;
  letter-spacing: -.03em;
}

.block-card {
  border-radius: 15px;
}

.track,
.progress,
.functions-session-progress,
.functions-progress-track {
  background: #dce8f6;
}

.track i,
.progress i,
.functions-session-progress i,
.functions-progress-track i {
  background: linear-gradient(90deg, var(--emt-blue), var(--emt-blue-bright));
}

.course-heading,
.study-heading,
.admin-heading {
  padding-bottom: 4px;
}

.course-heading h1,
.study-heading h1,
.admin-heading h1,
.narrow > h1 {
  color: #17233a;
  font-weight: 850;
  letter-spacing: -.045em;
}

.lead {
  color: var(--muted);
  line-height: 1.6;
}

select,
input,
textarea {
  border-color: #b9c7da;
  background: #fff;
}

select:hover,
input:hover,
textarea:hover {
  border-color: #8298b5;
}

.setup-card,
.question-card {
  border-radius: 20px;
  box-shadow: var(--shadow-md);
}

.question-card {
  position: relative;
  overflow: hidden;
}

.question-card::before {
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  content: "";
  background: linear-gradient(90deg, var(--emt-blue), var(--emt-blue-bright));
}

#questionMeta {
  color: var(--emt-blue);
  line-height: 1.6;
}

.question-card h2 {
  color: #18243b;
  font-weight: 780;
  letter-spacing: -.025em;
}

.option {
  min-height: 60px;
  border-color: #d2ddea;
  border-radius: 13px;
  color: #24324a;
  line-height: 1.45;
}

.option:hover {
  border-color: #8fb3df;
  background: var(--emt-sky);
  transform: translateY(-1px);
}

.option b {
  border-color: #9aabc1;
  color: var(--emt-blue);
}

.option.selected {
  border-color: var(--emt-blue-bright);
  background: var(--emt-blue-soft);
  box-shadow: 0 0 0 2px rgba(0, 114, 206, .1);
}

.option.selected b {
  border-color: var(--emt-blue);
  background: var(--emt-blue);
}

.navigator-wrap {
  border-color: var(--line);
  background: rgba(255, 255, 255, .78);
  box-shadow: var(--shadow-sm);
}

.question-nav button.current {
  border-color: var(--emt-blue);
  box-shadow: 0 0 0 2px rgba(0, 51, 160, .14);
}

.question-nav button.answered,
.key.answered {
  border-color: var(--emt-blue);
  background: var(--emt-blue);
  color: #fff;
}

.review-item {
  border-left-color: var(--emt-blue-bright);
}

.review-title {
  color: var(--emt-blue);
}

.result-option.correct {
  border-color: #3a7ec6;
  background: #e8f3ff;
  color: #063f7e;
}

.result-option.correct > b {
  border-color: var(--emt-blue);
  background: var(--emt-blue);
}

.answer-source {
  border-color: #c8d8eb;
  background: #f4f8fd;
}

.functions-overview-card,
.course-overview-card,
.practical-overview-card,
.exam-overview-card,
.line-study-hero,
.matching-group-hero {
  background: linear-gradient(130deg, var(--emt-blue-dark), var(--emt-blue) 58%, var(--emt-blue-bright));
  box-shadow: var(--shadow-blue);
}

.functions-overview-card .eyebrow,
.course-overview-card .eyebrow,
.practical-overview-card .eyebrow,
.exam-overview-card .eyebrow,
.line-study-hero .eyebrow,
.matching-group-hero .eyebrow {
  color: #aeddff;
}

.functions-overview-card p,
.course-overview-card p,
.practical-overview-card p,
.exam-overview-card p,
.line-study-hero p,
.matching-group-hero p {
  color: rgba(255, 255, 255, .82);
}

.function-mode-card:hover,
.line-topic-card:hover,
.practical-card:hover,
.exam-card:hover,
.course-session-card:hover {
  border-color: #89add8;
  box-shadow: 0 10px 26px rgba(18, 42, 82, .11);
}

.function-group-count,
.line-card-number,
.practical-number.large,
.session-number,
.large-number {
  background: var(--emt-blue);
  color: #fff;
}

.function-map-card > span,
.function-mode-card > i,
.line-topic-card i,
.practical-card small,
.practical-card > i,
.exam-card small,
.exam-card > i {
  color: var(--emt-blue-bright);
}

.function-map-card.review > i,
.function-map-card.mastered > i,
.function-mode-card > b,
.user-avatar {
  background: var(--emt-blue-soft);
  color: var(--emt-blue);
}

.line-study-intro,
.practical-next {
  border-color: #bad0e9;
  background: #edf5ff;
}

.matching-topic-card,
.practical-answer-card.model {
  border-color: #aac6e6;
  background: linear-gradient(135deg, #fff, #edf5ff);
}

.course-table thead th {
  background: var(--emt-blue);
  color: #fff;
}

.course-table tbody tr:nth-child(even) td {
  background: #f3f7fc;
}

.course-table tbody tr:hover td {
  background: #eaf3ff;
}

.course-table td:first-child {
  color: #153d78;
}

.course-table-wrap {
  border-color: #b9cbe1;
  box-shadow: var(--shadow-sm);
}

.login {
  background:
    radial-gradient(circle at 78% 12%, rgba(82, 178, 255, .45), transparent 28%),
    radial-gradient(circle at 12% 92%, rgba(0, 114, 206, .42), transparent 32%),
    linear-gradient(135deg, #001d57 0%, #0033a0 58%, #0072ce 100%);
}

.login-card {
  border: 1px solid rgba(255, 255, 255, .7);
  border-radius: 24px;
  background: rgba(255, 255, 255, .97);
  box-shadow: 0 32px 90px rgba(0, 20, 70, .38);
}

.login-card h1 {
  color: var(--emt-blue-dark);
  font-weight: 850;
  letter-spacing: -.045em;
}

.loading {
  background: rgba(244, 247, 251, .78);
  backdrop-filter: blur(5px);
}

.loading span {
  border-color: #d7e6f8;
  border-top-color: var(--emt-blue);
}

.pending-badge {
  background: #d92d20;
}

@media (max-width: 1120px) {
  header {
    gap: 12px;
    padding-inline: 16px;
  }

  .brand strong {
    display: none;
  }

  .main-nav button {
    padding-inline: 10px;
  }

  .current-user {
    max-width: 96px;
  }

  header > .theme-toggle .theme-label {
    display: none;
  }
}

@media (max-width: 720px) {
  body {
    padding-bottom: calc(82px + env(safe-area-inset-bottom));
  }

  header {
    height: 68px;
    padding-inline: 14px;
  }

  .brand span {
    width: 40px;
    height: 40px;
  }

  .current-user {
    margin-left: auto;
    max-width: min(42vw, 150px);
  }

  .main-nav {
    position: fixed;
    z-index: 50;
    inset: auto 0 0;
    display: flex;
    width: 100%;
    height: calc(74px + env(safe-area-inset-bottom));
    gap: 2px;
    padding: 7px 8px calc(7px + env(safe-area-inset-bottom));
    overflow-x: auto;
    border: 0;
    border-top: 1px solid #cfdaea;
    border-radius: 0;
    background: rgba(255, 255, 255, .96);
    box-shadow: 0 -10px 28px rgba(18, 42, 82, .12);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
  }

  .main-nav button {
    display: grid;
    flex: 0 0 72px;
    grid-template-rows: 23px auto;
    gap: 2px;
    min-height: 56px;
    padding: 6px 5px;
    border-radius: 11px;
    font-size: 10px;
    line-height: 1.05;
  }

  .main-nav button.active,
  .main-nav button[aria-current="page"] {
    background: var(--emt-blue);
  }

  .nav-icon {
    width: 100%;
    height: 23px;
    margin-inline: auto;
  }

  main {
    padding: 30px 15px 34px;
  }

  .hero {
    margin-inline: -2px;
    padding: 28px 22px;
    border-radius: 22px;
  }

  .hero h1,
  .narrow > h1 {
    font-size: clamp(37px, 11vw, 48px);
  }

  .hero-actions {
    min-width: 0;
  }

  .metric {
    min-height: 112px;
    padding: 18px;
  }

  .question-card {
    padding: 26px 18px 22px;
  }

  #questionMeta {
    font-size: 10px;
    letter-spacing: .09em;
  }

  .option {
    padding: 14px;
  }

  .result-actions {
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --line: #8799b1;
    --muted: #3f4e63;
  }

  .secondary,
  .option,
  select,
  input,
  textarea {
    border-width: 2px;
  }
}

/* Modo oscuro ------------------------------------------------------------ */

html[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e8eef8;
  --forest: #4d8df7;
  --green: #67b7ff;
  --mint: #172d50;
  --cream: #0b1220;
  --paper: #111c2e;
  --line: #2b3c56;
  --red: #ff7b72;
  --gold: #ffc766;
  --emt-blue: #4d8df7;
  --emt-blue-dark: #2b67c7;
  --emt-blue-bright: #67b7ff;
  --emt-blue-soft: #172d50;
  --emt-sky: #13233a;
  --muted: #a9b7ca;
  --shadow-sm: 0 6px 20px rgba(0, 0, 0, .2);
  --shadow-md: 0 18px 48px rgba(0, 0, 0, .28);
  --shadow-blue: 0 18px 38px rgba(0, 16, 55, .42);
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 8% 0%, rgba(30, 101, 211, .2), transparent 28rem),
    linear-gradient(180deg, #0b1220 0, #0e1727 24rem);
  color: var(--ink);
}

html[data-theme="dark"] header {
  border-bottom-color: rgba(70, 91, 122, .72);
  background: rgba(11, 18, 32, .94);
  box-shadow: 0 8px 30px rgba(0, 0, 0, .25);
}

html[data-theme="dark"] .brand {
  color: #f1f6ff;
}

html[data-theme="dark"] .main-nav {
  border-color: #293a53;
  background: #101b2d;
}

html[data-theme="dark"] .main-nav button {
  color: #b6c3d5;
}

html[data-theme="dark"] .main-nav button:hover {
  background: #1a2940;
  color: #fff;
}

html[data-theme="dark"] .main-nav button.active,
html[data-theme="dark"] .main-nav button[aria-current="page"] {
  background: #2b67c7;
  color: #fff;
}

html[data-theme="dark"] .theme-toggle {
  border-color: #3a4d6a;
  background: #152238;
  color: #cfe4ff;
}

html[data-theme="dark"] .theme-toggle:hover {
  border-color: #67b7ff;
  background: #1b3152;
}

html[data-theme="dark"] .theme-icon-moon {
  display: none;
}

html[data-theme="dark"] .theme-icon-sun {
  display: block;
}

html[data-theme="dark"] .login-theme-toggle {
  border-color: rgba(255, 255, 255, .35);
  background: rgba(4, 11, 25, .42);
  color: #fff;
}

html[data-theme="dark"] .current-user,
html[data-theme="dark"] .quiet,
html[data-theme="dark"] .back {
  color: #c0cce0;
}

html[data-theme="dark"] .quiet:hover,
html[data-theme="dark"] .back:hover {
  background: #172d50;
  color: #fff;
}

html[data-theme="dark"] .hero,
html[data-theme="dark"] .functions-overview-card,
html[data-theme="dark"] .course-overview-card,
html[data-theme="dark"] .practical-overview-card,
html[data-theme="dark"] .exam-overview-card,
html[data-theme="dark"] .line-study-hero,
html[data-theme="dark"] .matching-group-hero {
  background: linear-gradient(130deg, #071d4c 0%, #123f91 56%, #0879c9 100%);
}

html[data-theme="dark"] :is(
  .metric,
  .block-card,
  .setup-card,
  .question-card,
  .navigator-wrap,
  .review-item,
  .result-option,
  .history-card,
  .course-session-card,
  .course-session-hero,
  .course-start-card,
  .course-test-card,
  .course-complete-card,
  .course-section-card,
  .next-course-card,
  .content-card,
  .study-card,
  .syllabus-card,
  .study-topic-card,
  .study-plan-card,
  .daily-session-card,
  .gpt-guide,
  .function-metrics div,
  .function-mode-card,
  .function-group-card,
  .function-map-card,
  .function-study-card,
  .function-recall-card,
  .function-answer-card,
  .function-explanation,
  .function-user-answer,
  .function-official-answer,
  .function-keyword-result,
  .function-rating button,
  .line-study-card,
  .line-topic-card,
  .line-study-intro,
  .practical-card,
  .practical-hero,
  .practical-prompt,
  .practical-work-card,
  .practical-checklist,
  .practical-assessment,
  .practical-answer-card,
  .exam-card,
  .exam-intro,
  .exam-start,
  .exam-work,
  .exam-result,
  .exam-own-answers article,
  .admin-summary div,
  .user-card,
  .login-card
) {
  border-color: var(--line);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

html[data-theme="dark"] :is(
  .course-heading h1,
  .study-heading h1,
  .admin-heading h1,
  .narrow > h1,
  .section-head h2,
  .question-card h2,
  .review-item h3,
  .login-card h1,
  .practical-hero h2,
  .exam-hero h2
) {
  color: #f1f5fc;
}

html[data-theme="dark"] :is(
  .lead,
  .hero + p,
  .course-session-hero p,
  .course-start-card p,
  .course-test-card p,
  .course-complete-card p,
  .course-copy,
  .line-card-copy p,
  .standard-course-head p,
  .practical-hero p,
  .practical-completed p,
  .exam-intro p,
  .exam-hero p,
  .exam-start p,
  .exam-library-heading p,
  .exam-disclaimer,
  .function-mnemonic,
  .functions-complete-card p,
  .block-card small,
  .metric small,
  .current-user small
) {
  color: var(--muted);
}

html[data-theme="dark"] :is(input, select, textarea) {
  border-color: #425671;
  background: #0c1626;
  color: #f0f4fa;
}

html[data-theme="dark"] :is(input, select, textarea)::placeholder {
  color: #8291a7;
}

html[data-theme="dark"] .secondary {
  border-color: #435a79;
  background: #142238;
  color: #b9d8ff;
}

html[data-theme="dark"] .secondary:hover {
  border-color: #67b7ff;
  background: #1a3152;
  color: #fff;
}

html[data-theme="dark"] .primary {
  background: #2b67c7;
  color: #fff;
}

html[data-theme="dark"] .primary:hover {
  background: #4286ee;
}

html[data-theme="dark"] .track,
html[data-theme="dark"] .progress,
html[data-theme="dark"] .functions-session-progress,
html[data-theme="dark"] .functions-progress-track {
  background: #253852;
}

html[data-theme="dark"] .option {
  border-color: #344862;
  background: #121f32;
  color: #e8eef8;
}

html[data-theme="dark"] .option:hover {
  border-color: #5698e9;
  background: #172a46;
}

html[data-theme="dark"] .option.selected {
  border-color: #67b7ff;
  background: #18365d;
}

html[data-theme="dark"] .block-field {
  color: #e8eef8;
}

html[data-theme="dark"] .block-field legend {
  color: #f2f6fc;
}

html[data-theme="dark"] .block-field > p {
  color: #b4c1d3;
}

html[data-theme="dark"] .block-options {
  color-scheme: dark;
  scrollbar-color: #516784 #101a2a;
}

html[data-theme="dark"] .block-options label {
  border-color: #3a4e69;
  background: #111d30;
  color: #edf3fc;
  box-shadow: none;
}

html[data-theme="dark"] .block-options label:hover {
  border-color: #5b91d4;
  background: #172a45;
}

html[data-theme="dark"] .block-options label:has(input:checked) {
  border-color: #67b7ff;
  background: #18365d;
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(103, 183, 255, .2);
}

html[data-theme="dark"] .block-options input {
  accent-color: #67b7ff;
}

html[data-theme="dark"] .block-options span {
  color: inherit;
}

html[data-theme="dark"] .block-options small {
  color: #b8c7da;
}

html[data-theme="dark"] .block-options label:has(input:checked) small {
  color: #d5e9ff;
}

html[data-theme="dark"] .result-option {
  background: #0f1a2b;
}

html[data-theme="dark"] .result-option.correct {
  border-color: #4d8df7;
  background: #142e52;
  color: #cfe5ff;
}

html[data-theme="dark"] .result-option.wrong,
html[data-theme="dark"] .unanswered-note,
html[data-theme="dark"] .course-complete-card.not-passed,
html[data-theme="dark"] .line-topic-card.not-passed {
  border-color: #814a50;
  background: #361f29;
  color: #ffc7c2;
}

html[data-theme="dark"] .answer-source,
html[data-theme="dark"] .source-strip,
html[data-theme="dark"] .course-sources {
  border-color: #304764;
  background: #0f1d31;
  color: #b5c3d7;
}

html[data-theme="dark"] :is(.answer-source, .source-strip, .course-sources) a {
  color: #82c7ff;
}

html[data-theme="dark"] .course-table-wrap {
  border-color: #3a506c;
  background: #0f1a2b;
}

html[data-theme="dark"] .course-table {
  color: #e7edf7;
}

html[data-theme="dark"] .course-table th,
html[data-theme="dark"] .course-table td {
  border-color: #33465f;
}

html[data-theme="dark"] .course-table thead th {
  background: #204f9f;
}

html[data-theme="dark"] .course-table tbody td {
  background: #111d2f;
}

html[data-theme="dark"] .course-table tbody tr:nth-child(even) td {
  background: #16243a;
}

html[data-theme="dark"] .course-table tbody tr:hover td {
  background: #1b3152;
}

html[data-theme="dark"] .course-table td:first-child {
  color: #bcdcff;
}

html[data-theme="dark"] :is(
  .next-course-card,
  .line-study-intro,
  .practical-next,
  .matching-topic-card,
  .practical-answer-card.model,
  .function-official,
  .function-cloze
) {
  border-color: #355579;
  background: #132942;
  color: #e1edfb;
}

html[data-theme="dark"] :is(
  .course-session-card.completed,
  .line-topic-card.completed,
  .line-study-card.viewed,
  .functions-complete-card,
  .practical-completed,
  .function-map-card.mastered,
  .function-official-answer
) {
  border-color: #31715f;
  background: #12332f;
  color: #d8f5eb;
}

html[data-theme="dark"] :is(
  .course-session-card.in_progress,
  .line-topic-card.in_progress,
  .function-map-card.learning,
  .exam-warning,
  .exam-question-issue
) {
  border-color: #80652d;
  background: #332b1c;
  color: #ffe0a3;
}

html[data-theme="dark"] :is(
  .course-session-meta span,
  .function-keywords span,
  .function-map-card > i,
  .user-progress span,
  .line-data-tags span
) {
  background: #1b2a3e;
  color: #b8c7d9;
}

html[data-theme="dark"] .login {
  background:
    radial-gradient(circle at 78% 12%, rgba(50, 137, 226, .32), transparent 28%),
    radial-gradient(circle at 12% 92%, rgba(0, 83, 170, .32), transparent 32%),
    linear-gradient(135deg, #050b16 0%, #0b1f48 58%, #104f83 100%);
}

html[data-theme="dark"] .login-card {
  border-color: #344963;
  background: rgba(14, 24, 40, .97);
  box-shadow: 0 32px 90px rgba(0, 0, 0, .55);
}

html[data-theme="dark"] .loading {
  background: rgba(5, 10, 20, .78);
}

@media (max-width: 720px) {
  html[data-theme="dark"] .main-nav {
    border-top-color: #31425c;
    background: rgba(11, 18, 32, .97);
    box-shadow: 0 -10px 28px rgba(0, 0, 0, .35);
  }

  .login-theme-toggle .theme-label {
    display: none;
  }
}