/* Color, spacing and typography variables */
:root {
  --bg: #0b0f14;
  --card:#121820;
  --text:#e6eef8;
  --muted:#9fb3c8;
  --accent:#3aa0ff;
  --accent-2:#7bffb7;
  --border:#1e2a36;
  --link:#0d6efd;
  --link-hover:#0a58ca;
  --link-visited:#5a2ca0;

  /* vertical rhythm */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;

  /* font sizes */
  --font-sm: 14px;
  --font-base: 16px;
  --font-lg: 20px;
  --font-xl: 28px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'JetBrains Mono', Consolas, Menlo, Monaco, 'SFMono-Regular', monospace;
  font-size: var(--font-base);
  background: var(--bg);
  color: var(--text);
}
/* Normalize a few UA defaults that create unexpected spacing */
figure { margin: 0; }
blockquote { margin: 0; }
ul, ol { padding-left: 1.2em; }
input, select, textarea, button {
  font-family: inherit;
}
a {
  color: var(--link);
  text-decoration: underline;
  transition: color 0.2s ease;
}
a:visited {
  color: var(--link-visited);
}
a:hover {
  color: var(--link-hover);
}

/* Header */
header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(10px); background: color-mix(in srgb, var(--bg) 85%, transparent); border-bottom: 1px solid var(--border); }
.container { max-width: 1100px; margin: 0 auto; padding: 24px 16px; }
.row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { display: flex; gap: 10px; align-items: center; font-weight: 700; letter-spacing: 0.3px; }
.brand,
.brand a,
.brand a:visited {
  color: var(--accent);
  text-decoration: none;
}
.brand a:hover {
  color: var(--accent-2);
}
header a,
header a:visited {
  color: inherit;
  text-decoration: none;
}
header a:hover {
  color: var(--accent);
}
.brand-badge {
  width: 28px;
  height: 28px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 24px color-mix(in srgb, var(--accent) 40%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #001420;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--accent);
  color: #001420;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--accent) 70%, black);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.08s ease, box-shadow 0.2s ease,
    background-color 0.2s ease, color 0.2s ease;
}
.btn:link,
.btn:visited {
  color: var(--text);
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 35%, transparent);
}
.btn-large { padding: 14px 24px; font-size: var(--font-lg); border-radius: 14px; justify-content: center; }

/* Hero */
.hero { padding: 56px 0 28px; border-bottom: 1px solid var(--border); background: radial-gradient(1200px 600px at 70% -100px, color-mix(in srgb, var(--accent) 20%, transparent), transparent); }
.hero .title { font-size: clamp(28px, 5vw, 44px); margin: 0; line-height: 1.1; }
.hero p { margin: 0 0 20px; color: var(--muted); max-width: 720px; }
.hero details summary { padding: 0; }


.hero details p { margin-top: var(--space-md); }
.btn-secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-secondary:link,
.btn-secondary:visited { color: var(--text); }

/* Sections */
.section { padding: 28px 0; border-bottom: 1px solid var(--border); }
.badge { padding: var(--space-xs) var(--space-md); border-radius: 999px; border: 1px solid var(--border); color: var(--muted); font-size: var(--font-sm); }

.block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.block h3 {
  margin-top: 0;
}

.block--futuristic {
  background: var(--bg);

  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow:
    0 0 12px color-mix(in srgb, var(--accent) 25%, transparent),
    0 0 24px color-mix(in srgb, var(--accent-2) 15%, transparent);

}

.section-title {
  margin: 0 0 var(--space-lg);
  font-size: var(--font-lg);
}

/* Grid of subjects */
.subjects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
}
.card {
  background: #0f151d;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  display: grid;
  gap: var(--space-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px color-mix(in srgb, var(--accent) 15%, transparent);
}
.card h4 {
  margin: 0;
  font-size: var(--font-base);
  display: flex;
  align-items: center;
}
.card h4::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-right: var(--space-xs);
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233aa0ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 19.5A2.5 2.5 0 0 1 6.5 17H20'/%3E%3Cpath d='M4 4h16v13H6.5A2.5 2.5 0 0 0 4 19.5z'/%3E%3C/svg%3E")
    no-repeat center/contain;
}

.formats { display: flex; gap: var(--space-sm); flex-wrap: wrap; }
.exam-options { gap: var(--space-md); }

.checkbox-option {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.checkbox-option input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.checkbox-option label {
  cursor: pointer;
  font-weight: 600;
}

.checkbox-option input[type="checkbox"]:checked + label {
  color: var(--accent);
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 600;
  background: #0b1017;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}
.pill:hover {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
}
/* Exams selection UX */
.formats .pill input { margin: 0; }

/* Course graph component */
.course-card__graph {
  margin-top: var(--space-lg);
}

.course-graph {
  position: relative;
  --course-graph-column-width: 200px;
  --course-graph-row-height: 160px;
  --course-graph-gradient-start: rgba(0, 255, 156, 0.9);
  --course-graph-gradient-end: rgba(156, 107, 255, 0.85);
  --course-graph-muted: rgba(255, 255, 255, 0.12);
  --course-graph-panel: rgba(12, 18, 27, 0.88);
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(12, 18, 27, 0.8), rgba(9, 13, 19, 0.9));
  padding: 32px 24px;
  overflow: hidden;
}

.course-graph__nodes {
  position: relative;
  min-height: 240px;
}

.course-graph__node {
  position: absolute;
  display: inline-flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border-radius: 18px;
  border: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
  background: color-mix(in srgb, var(--course-graph-panel) 85%, transparent);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.3s ease, opacity 0.25s ease;
  left: calc(var(--graph-col, 0) * var(--course-graph-column-width) + var(--graph-offset-x, 0px));
  top: calc(var(--graph-row, 0) * var(--course-graph-row-height) + var(--graph-offset-y, 0px));
  transform: translate(-50%, -50%);
  width: 180px;
  color: var(--text);
  text-align: center;
}

.course-graph__node:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.course-graph__node--active:hover {
  transform: translate(-50%, -50%) scale(1.04);
  border-color: color-mix(in srgb, var(--accent) 70%, transparent);
  box-shadow: 0 12px 36px rgba(0, 255, 156, 0.28);
}

.course-graph__node--locked {
  opacity: 0.45;
  cursor: default;
  box-shadow: none;
}

.course-graph__node--locked .course-graph__ring-progress {
  filter: grayscale(1);
  opacity: 0.4;
}

.course-graph__node--highlighted {
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  box-shadow: 0 0 24px rgba(156, 107, 255, 0.45);
}

.course-graph__node--just-unlocked {
  animation: course-graph-pop 0.5s ease;
}

@keyframes course-graph-pop {
  0% {
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0;
  }
  60% {
    transform: translate(-50%, -50%) scale(1.08);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
  }
}

.course-graph__ring {
  position: relative;
  width: 96px;
  height: 96px;
  display: grid;
  place-items: center;
}

.course-graph__ring::after {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  background: rgba(10, 15, 22, 0.92);
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.55);
}

.course-graph__ring-progress {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    conic-gradient(
      from -90deg,
      var(--course-graph-gradient-start) 0 var(--graph-progress, 0%),
      rgba(255, 255, 255, 0.08) var(--graph-progress, 0%) 100%
    );
}

.course-graph__ring-label {
  position: relative;
  z-index: 1;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.4px;
}

.course-graph__node-title {
  font-weight: 700;
  font-size: 16px;
  display: block;
}

.course-graph__node-subtitle {
  display: block;
  font-size: 13px;
  color: var(--muted);
}

.course-graph__edges {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  stroke-linecap: round;
}

.course-graph__edge-line {
  stroke: rgba(0, 255, 156, 0.75);
  stroke-width: 4;
  opacity: 0.75;
  filter: drop-shadow(0 0 10px rgba(0, 255, 156, 0.35));
  transition: opacity 0.2s ease;
}

.course-graph__edge-line--locked {
  stroke: rgba(255, 255, 255, 0.2);
  opacity: 0.35;
  stroke-dasharray: 10 12;
  filter: none;
}

.course-graph__edge-line--highlighted {
  opacity: 1;
  filter: drop-shadow(0 0 12px rgba(156, 107, 255, 0.55));
}

.course-graph__empty {
  margin: 0;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 1024px) {
  .course-graph {
    --course-graph-column-width: 160px;
    --course-graph-row-height: 140px;
  }

  .course-graph__node {
    width: 160px;
  }
}

@media (max-width: 720px) {
  .course-graph {
    padding: 24px 18px;
    --course-graph-column-width: 140px;
    --course-graph-row-height: 120px;
  }

  .course-graph__node {
    width: 150px;
    padding: 14px;
  }
}

.module-detail__breadcrumbs {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.module-detail__breadcrumb {
  color: var(--accent);
}
.module-detail__breadcrumb:visited {
  color: var(--accent);
}

.module-detail__breadcrumb--current {
  color: var(--text);
}

.module-detail__header {
  margin-bottom: var(--space-lg);
}

.module-detail__accordion {
  background: rgba(10, 15, 22, 0.9);
  border: 1px solid var(--border);
  border-radius: 18px;
  margin-bottom: 0;
  overflow: hidden;
}

.module-detail__accordion-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: clamp(18px, 3vw, 28px);
  cursor: pointer;
  font-weight: 600;
  font-size: clamp(18px, 3vw, 26px);
  line-height: 1.2;
  list-style: none;
  background: transparent;
  color: var(--text);
}

.module-detail__accordion-summary::-webkit-details-marker {
  display: none;
}

.module-detail__accordion-summary::after {
  content: '∨';
  font-size: 22px;
  line-height: 1;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.module-detail__accordion-summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.module-detail__accordion[open] .module-detail__accordion-summary::after {
  content: '∧';
}

.module-detail__accordion-title {
  margin: 0;
}

.module-detail__accordion-body {
  padding: clamp(20px, 3vw, 32px) clamp(20px, 3vw, 32px) clamp(28px, 4vw, 40px);
  border-top: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
}

.module-detail__title {
  margin: 0 0 var(--space-sm);
}

.module-detail__subtitle {
  margin: 0;
  color: var(--muted);
}

.module-detail__description {
  background: rgba(10, 15, 22, 0.9);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: var(--space-lg);
}

.module-detail__relations {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: var(--space-lg);
}

.module-detail__layout {
  display: grid;
  gap: clamp(var(--space-sm), 2vw, 24px);
  max-width: min(100%, 1100px);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.module-detail__items-switcher {
  display: grid;
  gap: var(--space-md);
  background: rgba(10, 15, 22, 0.9);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: clamp(18px, 3vw, 28px);
}

.module-detail__items-switcher-title {
  margin: 0;
  font-size: clamp(16px, 2.6vw, 18px);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.module-detail__items-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.module-detail__item-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--border) 35%, transparent);
  color: var(--muted);
  font-size: var(--font-sm);
  font-weight: 600;
  text-decoration: none;
  flex: 1 1 clamp(180px, 28vw, 260px);
  min-width: clamp(180px, 45vw, 260px);
  transition: transform 0.15s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
  cursor: pointer;
}

.module-detail__item-button:hover {
  transform: translateY(-1px);
  color: var(--text);
}

.module-detail__item-button--pending,
.module-detail__item-button--neutral {
  opacity: 0.65;
}

.module-detail__item-button--correct {
  background: color-mix(in srgb, #1dd668 30%, transparent);
  border-color: color-mix(in srgb, #1dd668 60%, var(--border));
  color: #d8ffeb;
  opacity: 1;
}

.module-detail__item-button--incorrect {
  background: color-mix(in srgb, #ff4d79 30%, transparent);
  border-color: color-mix(in srgb, #ff4d79 60%, var(--border));
  color: #ffe1e8;
  opacity: 1;
}

.module-detail__item-button--locked {
  opacity: 0.35;
  pointer-events: none;
  cursor: not-allowed;
}

.module-detail__item-button--current {
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 45%, transparent);
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  color: #ffffff;
  opacity: 1;
}

.module-detail__item-button-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 600;
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  border: none;
  color: inherit;
}

.module-detail__item-button-title {
  flex: 1 1 auto;
  min-width: 0;
  line-height: 1.2;
  color: inherit;
}

.module-detail__content {
  display: grid;
  gap: var(--space-lg);
}

.module-detail__card {
  background: var(--card);
  border: none;
  border-radius: 18px;
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  gap: var(--space-lg);
  box-shadow: 0 26px 48px color-mix(in srgb, var(--accent) 16%, transparent);
}

.module-detail__card-header {
  display: grid;
  gap: var(--space-xs);
}

.module-detail__card-title {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
}

.module-detail__card-meta {
  margin: 0;
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: var(--font-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 55%, var(--border));
}

.module-detail__card-meta:empty {
  display: none;
}

.module-detail__card[data-kind='task'] .module-detail__card-meta {
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 18%, transparent);
  border-color: color-mix(in srgb, var(--accent-2) 60%, var(--border));
}

.module-detail__card-body {
  display: grid;
  gap: var(--space-md);
  line-height: 1.6;
}

.module-detail__theory,
.module-detail__task-description {
  display: grid;
  gap: var(--space-sm);
  width: 100%;
  overflow-wrap: anywhere;
}

.module-detail__theory > *,
.module-detail__task-description > * {
  max-width: 100%;
}

.module-detail__theory img,
.module-detail__task-description img,
.module-detail__theory video,
.module-detail__task-description video,
.module-detail__theory canvas,
.module-detail__task-description canvas,
.module-detail__theory iframe,
.module-detail__task-description iframe {
  max-width: 100%;
  height: auto;
}

.module-detail__theory table,
.module-detail__task-description table {
  max-width: 100%;
  width: 100%;
  overflow: hidden;
}

.module-detail__theory > *:last-child,
.module-detail__task-description > *:last-child {
  margin-bottom: 0;
}

.module-detail__task {
  display: grid;
  gap: var(--space-md);
}
.module-detail__task-panel {
  display: grid;
  gap: var(--space-lg);
  padding: clamp(16px, 2.5vw, 24px);
  border-radius: 16px;
  background: linear-gradient(165deg, rgba(21,33,46,0.96) 0%, rgba(10,16,24,0.92) 100%);
  border: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.module-detail__task-statement {
  padding: clamp(12px, 2vw, 20px);
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: rgba(12, 18, 26, 0.92);
  display: grid;
  gap: var(--space-sm);
}



.module-detail__task-meta {
  display: grid;
  gap: var(--space-sm);
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin: 0;
}

.module-detail__task-meta div {
  display: grid;
  gap: 4px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--card) 82%, transparent);
}

.module-detail__task-meta dt {
  margin: 0;
  font-size: var(--font-sm);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.module-detail__task-meta dd {
  margin: 0;
  font-weight: 600;
}

.module-detail__card-footer {
  border-top: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  padding-top: var(--space-lg);
  display: grid;
  gap: var(--space-md);
}

.module-detail__action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.module-detail__card-navigation {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.module-detail__nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: var(--font-sm);
  text-decoration: none;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border));
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.module-detail__nav-link:hover {
  color: #ffffff;
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
}

.module-detail__alert {
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, #f6c86c 45%, var(--border));
  background: color-mix(in srgb, #f6c86c 16%, #0b1119);
  color: #f8e4b4;
  font-size: var(--font-sm);
}

@media (max-width: 960px) {
  .module-detail__layout {
    padding: 0 var(--space-lg);
  }

  .module-detail__card {
    padding: 20px;
  }
}

@media (max-width: 640px) {
  .module-detail__layout {
    padding: 0 var(--space-md);
  }

  .module-detail__items-buttons {
    flex-direction: column;
  }

  .module-detail__item-button {
    flex: 1 1 auto;
    min-width: 100%;
  }

  .module-detail__card-title {
    font-size: clamp(20px, 6vw, 26px);
  }

  .module-detail__card-meta {
    font-size: 12px;
  }

  .module-detail__nav-link {
    width: 100%;
    justify-content: center;
  }
}

.formats .pill:has(input:checked) {
  background: color-mix(in srgb, var(--accent) 22%, #0b1017);
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 25%, transparent);
}

.courses-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
}

.course-card {
  grid-template-rows: auto;
  gap: var(--space-sm);
}

.course-card__image {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 8px;
}

.course-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-sm);
}

.course-card__title {
  margin: 0;
  font-size: var(--font-lg);
  line-height: 1.2;
}

.course-card__status {
  font-size: var(--font-sm);
  padding: 4px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 22%, #0b1017);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.course-card__subtitle {
  margin: 0;
  color: var(--muted);
}

.course-card__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-sm);
  margin: 0;
}

.course-card__meta div {
  display: grid;
  gap: 4px;
}

.course-card__meta dt {
  font-size: var(--font-sm);
  color: var(--muted);
  margin: 0;
}

.course-card__meta dd {
  margin: 0;
  font-weight: 600;
}

.course-card__progress {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 18%, #0b1017);
  overflow: hidden;
}

.course-card__progress-bar {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
}

.course-card__progress-label {
  margin: 0;
  font-size: var(--font-sm);
  color: var(--muted);
}

/* Custom checkbox inside pill */
.pill-check .tick {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border-radius: 5px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border));
  background: #0d131b;
  display: inline-block;
  position: relative;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 0 0 1px rgba(0,0,0,0.3);
  transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.pill-check:has(input:checked) .tick {
  background: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 80%, black);
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 35%, transparent);
}
.pill-check:has(input:checked) .tick::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 7px;
  height: 11px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Footer CTA */
.cta-block { text-align: center; padding: 28px 0 48px; }
.muted { color: var(--muted); }

/* Testimonials */
#reviews .card p { color: var(--muted); }
#reviews .card figcaption { color: var(--accent); font-style: italic; font-weight: 600; }

/* Auth forms */
.auth-form { background: var(--card); border:1px solid var(--border); border-radius:12px; padding:20px; max-width:400px; }
.auth-form label { display:block; margin-bottom:var(--space-xs); }
.auth-form input { width:100%; padding:var(--space-sm); border:1px solid var(--border); border-radius:8px; background:var(--bg); color:var(--text); }
.auth-form .helptext { display:block; margin-top:var(--space-xs); color:var(--muted); font-size:var(--font-sm); }

/* Signup form */
.signup-form { display:grid; gap:var(--space-md); }
.signup-form .grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(180px,1fr)); gap:var(--space-sm); }
.signup-form input, .signup-form select, .signup-form textarea { width:100%; padding:var(--space-sm); border:1px solid var(--border); border-radius:8px; background:var(--bg); color:var(--text); }
.signup-form textarea { height:44px; resize:vertical; }
.signup-form .card { padding:var(--space-lg) 14px; }
.signup-form .card p { margin: 0; }

.subjects-title {
  font-size: clamp(16px, 4vw, 28px);
  font-weight: 700;
  text-align: center;
  color: var(--text);
  margin: 0 0 var(--space-md);
}

.signup-prompt {
  font-size: clamp(18px, 4vw, 24px);
  font-weight: 600;
  text-align: center;
  margin: 0 0 var(--space-lg);
}

.signup-prompt a {
  color: var(--accent);
}

@media (max-width: 480px) {
  .subjects-title { font-size: 18px; }
  .signup-prompt { font-size: 18px; }
}

/* Dashboard */
.container-fluid { max-width: 100%; margin: 0 auto; padding: 24px 16px; }
.dashboard-container { display:block; }
.dashboard-content { width:100%; }
.dashboard-panel { background: var(--card); border:1px solid var(--border); border-radius:12px; padding:16px; }

.required-tags {
  margin-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.tag-progress-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag-progress-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-width: 160px;
}

.tag-progress-chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: var(--space-xs);
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: none;
  overflow: hidden;
  color: var(--text);
  font-weight: 500;
}

.tag-progress-chip::before {
  content: "";
  position: absolute;
  inset: 0;
  width: var(--tag-progress, 0%);
  background: color-mix(in srgb, var(--accent) 55%, transparent);
  opacity: 0.35;
  pointer-events: none;
  transition: width 0.3s ease;
}

.tag-progress-chip__label,
.tag-progress-chip__percent {
  position: relative;
  z-index: 1;
  font-size: var(--font-sm);
}

.tag-progress-chip__percent {
  font-variant-numeric: tabular-nums;
  color: color-mix(in srgb, var(--text) 80%, var(--muted));
}

.tag-progress-meta {
  font-size: var(--font-xs);
  color: var(--muted);
}

/* Top tabs navigation (browser-like) */
.dashboard-tabs { margin-bottom: 0; }
.dashboard-tabs .tabs { list-style:none; margin:0; padding:0; display:flex; gap:var(--space-sm); align-items:flex-end; overflow-x:auto; overflow-y:hidden; -webkit-overflow-scrolling: touch; scrollbar-width: thin; }
.dashboard-tabs .tabs li { flex: 0 0 auto; }
.dashboard-tabs .tabs a {
  display:block;
  padding:10px 14px;
  color:var(--muted);
  border:1px solid var(--border);
  border-bottom:none;
  border-top-left-radius:12px;
  border-top-right-radius:12px;
  background:#0b1017;
  white-space:nowrap;
  transition:all .2s ease;
  margin-bottom:-1px; /* соединяем с панелью */
}
.dashboard-tabs .tabs a:visited { color:var(--muted); }
.dashboard-tabs .tabs a:hover { color:var(--text); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.dashboard-tabs .tabs li.active a {
  color:var(--text);
  background: var(--card);
  border-color: var(--border);
}

@media (max-width: 640px) {
  .dashboard-tabs .tabs { gap: var(--space-xs); }
  .dashboard-tabs .tabs a { padding: 10px 12px; font-size: var(--font-sm); }
}

/* Dashboard settings */
.dashboard-content form { background: var(--card); border:1px solid var(--border); border-radius:12px; padding:20px; }
.dashboard-content form h2 { margin-top:0; }
.dashboard-content label { display:block; margin-bottom:var(--space-xs); }
.dashboard-content input, .dashboard-content select { width:100%; padding:var(--space-sm); border:1px solid var(--border); border-radius:8px; background:var(--bg); color:var(--text); }
.role-toggle { display:flex; gap:var(--space-sm); }
.role-toggle input { display:none; }
.role-toggle label { flex:1; text-align:center; padding:10px 0; border:1px solid var(--border); border-radius:10px; background:var(--card); cursor:pointer; }
.role-toggle input:checked + label { background:var(--accent); color:#001420; border-color:color-mix(in srgb, var(--accent) 70%, black); }


.teacher-skillset {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-lg);
  margin-top: var(--space-xl);
  background: color-mix(in srgb, var(--card) 85%, transparent);
}

.teacher-skillset legend {
  font-weight: 600;
  padding: 0 var(--space-sm);
}

.teacher-skillset__rows {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.teacher-skillset__row {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: minmax(0, 1fr) minmax(0, 160px) auto;
  align-items: end;
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
}

.teacher-skillset__row--hidden {
  display: none;
}

.teacher-skillset__weight input {
  text-align: right;
}

.teacher-skillset__controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  justify-content: flex-end;
}

.teacher-skillset__remove {
  border: none;
  background: none;
  color: var(--muted);
  font-size: 28px;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
  transition: color 0.2s ease;
}

.teacher-skillset__remove:hover:not(:disabled) {
  color: var(--accent);
}

.teacher-skillset__remove:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.teacher-skillset__delete {
  display: none;
}

.teacher-skillset__footer {
  margin-top: var(--space-md);
  display: flex;
  justify-content: flex-end;
}

.btn-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 24px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.btn-icon:hover {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.btn-icon:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-icon:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

@media (max-width: 720px) {
  .teacher-skillset__row {
    grid-template-columns: 1fr;
  }

  .teacher-skillset__controls {
    justify-content: flex-start;
  }
}


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

/* Spacing utilities */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-8 { margin-bottom: var(--space-sm); }
.mb-16 { margin-bottom: var(--space-lg); }
.mt-12 { margin-top: var(--space-md); }

/* Price display */
.price-old {
  text-decoration: line-through;
  color: #888;
}

.price-new {
  font-weight: 700;
}

.price-note {
  font-size: 0.9rem;
  color: #555;
}

.task-placeholder {
  background-color: rgba(255, 223, 142, 0.35);
  border-bottom: 1px dashed #c68a00;
  border-radius: 3px;
  padding: 0 2px;
  font-weight: 600;
}

/* Mobile header layout: stack title and account button */
@media (max-width: 640px) {
  header .row {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }
}






.module-detail__task-form {
  display: grid;
  gap: var(--space-md);
}

.module-detail__answer-fields {
  display: grid;
  gap: var(--space-md);
}

.module-detail__answer-field {
  display: grid;
  gap: var(--space-xs);
}

.module-detail__answer-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--border) 40%, transparent);
  background: rgba(8, 12, 18, 0.92);
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.module-detail__answer-input:focus {
  border-color: color-mix(in srgb, var(--accent) 70%, transparent);
  box-shadow: 0 0 0 3px rgba(58, 160, 255, 0.2);
  outline: none;
}

.module-detail__answer-field .errorlist {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--font-sm);
  color: #ff6f91;
}

.module-detail__answer-field .errorlist li {
  margin: 0;
}



=

/* Task HTML cards (single source of truth for tasks rendered from the DB) */
.task-card {
  display: grid;
  gap: var(--space-md);
  line-height: 1.6;
  color: var(--text);
}

/* If a task card is used outside the .card wrapper, keep it visually consistent */
.task-card:not(.card) {
  background: color-mix(in srgb, var(--card) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(14px, 3vw, 22px);
  box-shadow: 0 12px 32px color-mix(in srgb, var(--accent) 12%, transparent);
}

.task-card p {
  margin: 0;
}

.task-card code {
  padding: 2px 6px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--border) 60%, transparent);
}

.task-card .fano-tree {
  width: min(640px, 100%);
  max-width: 100%;
  display: block;
  margin: 0 auto;
}

.task-card .fano-tree .e {
  stroke: color-mix(in srgb, var(--text) 90%, #dff9f0);
  stroke-width: 2;
  stroke-linecap: round;
}

.task-card .fano-tree .t {
  fill: color-mix(in srgb, var(--text) 92%, #e8fff7);
  font-size: clamp(14px, 2.3vw, 18px);
  font-weight: 600;
  font-family: inherit;
  text-anchor: middle;
  dominant-baseline: middle;
}