:root {
  --hue: 198;
  --bg-main: hsla(var(--hue), 32%, 97%, 1);
  --bg-alt: hsla(var(--hue), 34%, 93%, 0.85);
  --text-strong: hsla(var(--hue), 28%, 16%, 1);
  --text-soft: hsla(var(--hue), 20%, 32%, 1);
  --surface: hsla(var(--hue), 30%, 100%, 0.9);
  --surface-strong: hsla(var(--hue), 30%, 99%, 1);
  --border: hsla(var(--hue), 26%, 68%, 0.34);
  --brand: hsla(var(--hue), 70%, 46%, 1);
  --brand-dark: hsla(var(--hue), 70%, 35%, 1);
  --brand-soft: hsla(var(--hue), 84%, 94%, 1);
  --shadow: hsla(var(--hue), 45%, 24%, 0.16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-top: 4.9rem;
  font-family: "Nunito", sans-serif;
  background:
    radial-gradient(1200px 600px at 100% 0%, hsla(var(--hue), 88%, 86%, 0.55) 0%, transparent 70%),
    radial-gradient(1000px 500px at 0% 10%, hsla(var(--hue), 88%, 88%, 0.45) 0%, transparent 65%),
    var(--bg-main);
  color: var(--text-strong);
  line-height: 1.65;
}

h1,
h2,
h3,
h4,
h5,
h6,
.navbar-brand {
  font-family: "Raleway", sans-serif;
  letter-spacing: 0.015em;
}

p {
  color: var(--text-soft);
}

a {
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.section-block {
  padding: clamp(2.75rem, 6.5vw, 5.25rem) 0;
}

.section-alt {
  background: linear-gradient(
    155deg,
    hsla(var(--hue), 54%, 92%, 0.62) 0%,
    hsla(var(--hue), 34%, 97%, 0.7) 100%
  );
}

.site-nav {
  background: hsla(var(--hue), 28%, 13%, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid hsla(var(--hue), 24%, 82%, 0.18);
}

.site-nav .navbar-brand,
.site-nav .nav-link {
  color: hsla(var(--hue), 12%, 97%, 0.95);
}

.site-nav .nav-link {
  padding: 0.45rem 0.85rem;
  font-weight: 700;
}

.site-nav .nav-link:hover,
.site-nav .nav-link:focus {
  color: hsla(var(--hue), 100%, 84%, 1);
}

.site-nav .navbar-toggler {
  border-color: hsla(var(--hue), 25%, 90%, 0.35);
}

.site-nav .navbar-toggler-icon {
  filter: brightness(2.5) saturate(0);
}

.hero {
  padding-top: clamp(2.5rem, 8vw, 6rem);
}

.hero-shell {
  background: linear-gradient(
    145deg,
    hsla(var(--hue), 38%, 100%, 0.88) 0%,
    hsla(var(--hue), 52%, 95%, 0.85) 100%
  );
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  box-shadow: 0 20px 46px -28px var(--shadow);
  padding: clamp(1.4rem, 4vw, 3rem);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 800;
  font-size: 0.75rem;
  color: var(--brand-dark);
}

.hero-title {
  font-size: clamp(1.95rem, 4.8vw, 3.35rem);
  line-height: 1.15;
}

.role {
  color: var(--brand-dark);
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  margin-top: 0.3rem;
}

.hero-text {
  max-width: 56ch;
  font-size: clamp(1rem, 2.2vw, 1.16rem);
}

.btn-brand {
  background: var(--brand);
  color: #fff;
  border: 0;
  padding: 0.64rem 1.18rem;
  font-weight: 800;
  border-radius: 0.72rem;
}

.btn-brand:hover,
.btn-brand:focus {
  background: var(--brand-dark);
  color: #fff;
}

.btn-outline-brand {
  border: 1px solid var(--brand-dark);
  color: var(--brand-dark);
  padding: 0.62rem 1.15rem;
  font-weight: 800;
  border-radius: 0.72rem;
  background: transparent;
}

.btn-outline-brand:hover,
.btn-outline-brand:focus {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.section-heading h2 {
  font-size: clamp(1.45rem, 3.3vw, 2.3rem);
  line-height: 1.25;
}

.section-subtitle {
  max-width: 68ch;
}

.stat-card,
.project-card,
.contact-card {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.15rem 1.2rem;
  box-shadow: 0 18px 38px -30px var(--shadow);
}

.project-card {
  padding: 1.3rem;
}

.icon-circle {
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: hsla(var(--hue), 74%, 91%, 1);
  color: var(--brand-dark);
}

.badge-skill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-strong);
  font-weight: 800;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
}

.quick-link {
  color: var(--text-strong);
  text-decoration: none;
  border-radius: 0.5rem;
  padding: 0.08rem 0.3rem;
  margin-left: -0.3rem;
}

.external-link:hover,
.external-link:focus {
  color: var(--brand-dark);
  background: hsla(var(--hue), 92%, 90%, 0.72);
  box-shadow: 0 0 0 2px hsla(var(--hue), 75%, 74%, 0.42);
}

.viz-links-wrap {
  border-top: 1px solid var(--border);
  padding-top: 0.8rem;
}

.viz-links-title {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 800;
  color: var(--brand-dark);
}

.viz-link {
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  width: fit-content;
}

.resource-scroller {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.45rem;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.resource-card {
  flex: 0 0 min(300px, 84vw);
  min-height: 230px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 18px 38px -30px var(--shadow);
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
}

.resource-card-add {
  cursor: pointer;
  text-align: left;
  border-style: dashed;
  background: hsla(var(--hue), 50%, 96%, 0.95);
}

.resource-icon {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 0.72rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: 0.78rem;
  color: var(--brand-dark);
  background: hsla(var(--hue), 72%, 90%, 1);
}

.viz-card {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 18px 38px -30px var(--shadow);
}

.viz-card-full {
  padding: 1.2rem;
}

.viz-caption {
  font-size: 0.95rem;
}

.viz-canvas {
  width: 100%;
  height: 300px;
  display: block;
  border-radius: 0.85rem;
  border: 1px solid hsla(var(--hue), 30%, 69%, 0.35);
  background: hsla(var(--hue), 40%, 97%, 1);
}

.viz-canvas-full {
  height: min(70vh, 680px);
  min-height: 420px;
}

.viz-tile-slider {
  position: relative;
  min-height: 84px;
  border-radius: 1rem;
  border: 1px solid hsla(var(--hue), 28%, 80%, 0.85);
  background: hsla(var(--hue), 46%, 97%, 0.98);
  overflow: hidden;
  cursor: ew-resize;
  user-select: none;
  touch-action: none;
  outline: none;
}

.viz-tile-slider:focus-visible {
  box-shadow: 0 0 0 3px hsla(var(--hue), 80%, 65%, 0.38);
}

.viz-tile-fill {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    hsla(var(--hue), 78%, 88%, 0.92) 0%,
    hsla(var(--hue), 72%, 83%, 0.95) 100%
  );
  border-right: 1px solid hsla(var(--hue), 35%, 60%, 0.24);
}

.viz-tile-text {
  position: relative;
  z-index: 1;
  padding: 0.7rem 0.9rem;
}

.viz-tile-value {
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  font-weight: 800;
  line-height: 1.05;
  color: hsla(var(--hue), 24%, 22%, 0.95);
  text-shadow: 0 1px 0 hsla(var(--hue), 20%, 100%, 0.55);
}

.viz-tile-label {
  margin-top: 0.22rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 800;
  color: hsla(var(--hue), 24%, 30%, 0.88);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.viz-tile-desc {
  margin-top: 0.12rem;
  font-size: 0.62rem;
  font-weight: 700;
  color: hsla(var(--hue), 20%, 36%, 0.72);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.viz-canvas-ising {
  height: 440px;
}

.viz-canvas-ising-full {
  height: min(86vh, 920px);
  min-height: 520px;
}

.viz-canvas-irodov {
  height: 380px;
}

.viz-metric-card {
  background: hsla(var(--hue), 56%, 96%, 1);
  border: 1px solid hsla(var(--hue), 30%, 74%, 0.45);
  border-radius: 0.9rem;
  padding: 0.6rem 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.viz-metric-value {
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--text-strong);
}

.viz-metric-label {
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-size: 0.67rem;
  color: var(--text-soft);
  font-weight: 800;
}

.viz-time-scrub {
  border: 1px solid hsla(var(--hue), 30%, 74%, 0.45);
  border-radius: 0.9rem;
  background: hsla(var(--hue), 56%, 96%, 1);
  padding: 0.55rem 0.72rem 0.45rem;
}

.viz-time-scrub-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  color: var(--text-soft);
  font-weight: 800;
}

.viz-time-scrub-value {
  font-size: 0.85rem;
  color: var(--text-strong);
  font-weight: 800;
}

.viz-time-scrub .form-range {
  margin: 0.2rem 0 0;
  accent-color: var(--brand-dark);
}

.viz-full-layout .section-heading,
.viz-full-layout .site-footer {
  display: none;
}

.viz-full-header {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem 1.1rem;
}

.viz-full-body {
  margin-bottom: 1.2rem;
}

.problem-sheet {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem;
  box-shadow: 0 18px 38px -30px var(--shadow);
}

.problem-sheet .formula {
  font-weight: 800;
  color: var(--brand-dark);
}

.app-card {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.1rem;
  box-shadow: 0 18px 38px -30px var(--shadow);
}

.app-card-minimal {
  background: linear-gradient(
    165deg,
    hsla(var(--hue), 52%, 98%, 0.98) 0%,
    hsla(var(--hue), 42%, 95%, 0.95) 100%
  );
}

.app-head-minimal {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.btn-icon-soft {
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--border);
  border-radius: 0.72rem;
  background: hsla(var(--hue), 66%, 95%, 1);
  color: var(--text-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon-soft:hover,
.btn-icon-soft:focus-visible {
  background: hsla(var(--hue), 68%, 89%, 1);
  color: var(--brand-dark);
}

.app-word {
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: hsla(var(--hue), 56%, 96%, 1);
  font-size: clamp(1.1rem, 3.3vw, 1.75rem);
  letter-spacing: 0.08em;
  font-weight: 800;
  padding: 0.78rem 0.92rem;
  word-break: break-word;
}

.app-status {
  color: var(--brand-dark);
  font-weight: 700;
}

.app-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.app-tab-btn {
  border: 1px solid var(--border);
  background: hsla(var(--hue), 52%, 96%, 1);
  color: var(--text-strong);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-weight: 800;
  font-size: 0.84rem;
}

.app-tab-btn.is-active {
  background: hsla(var(--hue), 68%, 87%, 1);
  border-color: hsla(var(--hue), 42%, 62%, 0.7);
}

.app-tabs-minimal .app-tab-btn {
  background: hsla(var(--hue), 54%, 97%, 1);
}

.app-tab-panel {
  border-top: 1px dashed var(--border);
  padding-top: 0.72rem;
}

.app-game-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.48rem;
}

.app-meta-chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: hsla(var(--hue), 58%, 96%, 1);
  padding: 0.2rem 0.62rem;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--text-strong);
}

.app-control-strip {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1fr auto;
  gap: 0.62rem;
}

.app-icon-field {
  display: grid;
  gap: 0.3rem;
}

.app-control-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: hsla(var(--hue), 20%, 36%, 0.82);
  font-weight: 800;
}

.app-icon-input {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 0.72rem;
  background: hsla(var(--hue), 52%, 97%, 1);
  overflow: hidden;
}

.app-icon-input i {
  width: 2.25rem;
  flex: 0 0 2.25rem;
  text-align: center;
  color: var(--brand-dark);
}

.app-icon-input .app-select,
.app-icon-input .app-input {
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.app-icon-input .app-select:focus,
.app-icon-input .app-input:focus {
  box-shadow: none;
}

.app-icon-field-small .app-input {
  min-width: 84px;
}

.app-icon-toggle {
  border: 1px solid var(--border);
  border-radius: 0.72rem;
  background: hsla(var(--hue), 52%, 97%, 1);
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.42rem 0.62rem;
  align-self: end;
  font-weight: 700;
  color: var(--text-strong);
}

.app-icon-toggle input {
  accent-color: var(--brand-dark);
}

.app-topic-meta {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.app-topic-meta i {
  color: var(--brand-dark);
}

.app-pill {
  border: 1px solid hsla(var(--hue), 30%, 70%, 0.45);
  border-radius: 999px;
  padding: 0.14rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 800;
  color: hsla(var(--hue), 18%, 32%, 0.88);
  background: hsla(var(--hue), 66%, 92%, 0.7);
}

.app-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.56rem;
}

.app-stat-box {
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: hsla(var(--hue), 58%, 96%, 1);
  padding: 0.6rem 0.68rem;
  display: flex;
  flex-direction: column;
}

.app-stat-value {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-strong);
}

.app-stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 800;
  color: var(--text-soft);
}

.app-keyboard {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.42rem;
}

.app-key-btn {
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  background: hsla(var(--hue), 58%, 96%, 1);
  color: var(--text-strong);
  font-weight: 800;
  padding: 0.38rem 0;
}

.app-key-btn:hover,
.app-key-btn:focus-visible {
  background: hsla(var(--hue), 68%, 90%, 1);
}

.app-key-btn.is-disabled,
.app-key-btn:disabled {
  opacity: 0.45;
}

.app-input-row {
  display: flex;
  gap: 0.56rem;
}

.app-input {
  border-radius: 0.7rem;
  border: 1px solid var(--border);
}

.app-settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.56rem;
}

.app-field-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
  font-weight: 800;
  margin-bottom: 0.28rem;
}

.app-select {
  border-radius: 0.72rem;
  border: 1px solid var(--border);
}

.app-switch-row {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.topic-manager {
  display: grid;
  grid-template-columns: 0.9fr 1.6fr;
  gap: 0.72rem;
}

.topic-list-panel,
.topic-editor-panel {
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: hsla(var(--hue), 56%, 97%, 1);
  padding: 0.72rem;
}

.topic-create-row,
.topic-add-row,
.topic-word-item,
.topic-editor-head {
  display: flex;
  align-items: center;
  gap: 0.52rem;
}

.topic-create-row .app-input,
.topic-add-row .app-input,
.topic-word-item .app-input {
  flex: 1 1 auto;
}

.topic-list {
  max-height: 390px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.44rem;
}

.topic-item {
  border: 1px solid hsla(var(--hue), 28%, 76%, 0.7);
  border-radius: 0.75rem;
  background: hsla(var(--hue), 58%, 98%, 0.96);
  padding: 0.44rem 0.52rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  text-align: left;
  color: var(--text-strong);
}

.topic-item:hover,
.topic-item:focus-visible {
  border-color: hsla(var(--hue), 45%, 58%, 0.8);
}

.topic-item.is-active {
  border-color: hsla(var(--hue), 45%, 58%, 0.8);
  background: hsla(var(--hue), 74%, 93%, 0.7);
}

.topic-item-main {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.topic-item-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

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

.topic-item-text small {
  color: var(--text-soft);
}

.topic-word-list {
  max-height: 330px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.46rem;
}

.mathlatex-card {
  background: linear-gradient(
    165deg,
    hsla(var(--hue), 52%, 98%, 0.98) 0%,
    hsla(var(--hue), 42%, 95%, 0.95) 100%
  );
}

.mathlatex-parse-grid,
.mathlatex-library-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.72rem;
}

.mathlatex-panel {
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: hsla(var(--hue), 56%, 97%, 1);
  padding: 0.72rem;
}

.mathlatex-meta {
  font-size: 0.78rem;
  color: var(--text-soft);
}

.mathlatex-preview {
  width: 100%;
  border-radius: 0.7rem;
  border: 1px solid var(--border);
  max-height: 320px;
  object-fit: contain;
  background: hsla(var(--hue), 54%, 98%, 1);
}

.mathlatex-textarea {
  min-height: 180px;
}

.mathlatex-eq-list {
  max-height: 310px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.52rem;
}

.mathlatex-eq-item {
  border: 1px solid hsla(var(--hue), 30%, 72%, 0.6);
  border-radius: 0.8rem;
  background: hsla(var(--hue), 58%, 98%, 0.95);
  padding: 0.55rem;
  display: flex;
  flex-direction: column;
  gap: 0.46rem;
}

.mathlatex-eq-render {
  border: 1px solid hsla(var(--hue), 30%, 74%, 0.5);
  border-radius: 0.68rem;
  background: hsla(var(--hue), 60%, 98%, 1);
  padding: 0.44rem 0.5rem;
  overflow-x: auto;
}

.mathlatex-tag-suggestions,
.mathlatex-tag-picked,
.mathlatex-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.mathlatex-chip {
  border: 1px solid hsla(var(--hue), 30%, 72%, 0.55);
  border-radius: 999px;
  background: hsla(var(--hue), 62%, 95%, 1);
  color: var(--text-strong);
  font-weight: 700;
  font-size: 0.76rem;
  padding: 0.2rem 0.56rem;
}

.mathlatex-chip.is-picked {
  background: hsla(var(--hue), 72%, 90%, 0.95);
}

.mathlatex-item-list {
  max-height: 560px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.56rem;
}

.mathlatex-item {
  border: 1px solid hsla(var(--hue), 30%, 72%, 0.58);
  border-radius: 0.85rem;
  background: hsla(var(--hue), 58%, 98%, 0.95);
  padding: 0.64rem;
}

.mathlatex-item.is-active {
  border-color: hsla(var(--hue), 45%, 58%, 0.85);
}

.mathlatex-item-title {
  border: 0;
  background: transparent;
  color: var(--text-strong);
  font-weight: 800;
  text-align: left;
  padding: 0;
}

.mathlatex-item-title:hover,
.mathlatex-item-title:focus-visible {
  color: var(--brand-dark);
}

.mathlatex-snippet {
  font-size: 0.86rem;
  color: var(--text-soft);
}

.mathlatex-item-eq-list {
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
}

.app-teacher-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.72rem;
}

.app-panel {
  border: 1px solid var(--border);
  border-radius: 0.88rem;
  background: hsla(var(--hue), 55%, 96%, 1);
  padding: 0.72rem;
}

.app-panel-title {
  margin: 0 0 0.56rem;
  font-weight: 800;
  color: var(--text-strong);
}

.app-list-block {
  display: flex;
  flex-direction: column;
  gap: 0.46rem;
  max-height: 260px;
  overflow-y: auto;
}

.app-list-item {
  border: 1px solid hsla(var(--hue), 28%, 76%, 0.7);
  border-radius: 0.75rem;
  background: hsla(var(--hue), 58%, 98%, 0.96);
  padding: 0.44rem 0.52rem;
  display: flex;
  gap: 0.46rem;
  align-items: center;
  justify-content: space-between;
}

.app-list-item span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-list-item.is-active {
  border-color: hsla(var(--hue), 45%, 58%, 0.8);
}

.app-check-row {
  display: flex;
  align-items: center;
  gap: 0.56rem;
}

.app-history {
  border-top: 1px dashed var(--border);
  padding-top: 0.72rem;
}

.app-history ul {
  padding-left: 1.1rem;
}

.app-guess-list {
  max-height: 170px;
  overflow: auto;
  padding-left: 1.1rem;
}

.app-empty {
  color: hsla(var(--hue), 18%, 40%, 0.86);
}

.app-history-list {
  display: flex;
  flex-direction: column;
  gap: 0.56rem;
}

.app-history-item {
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: hsla(var(--hue), 58%, 96%, 1);
  padding: 0.55rem 0.62rem;
}

.app-team-scores {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.app-team-chip {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: hsla(var(--hue), 58%, 96%, 1);
  padding: 0.35rem 0.62rem;
  min-width: 112px;
  display: inline-flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: center;
}

.app-team-chip.is-active {
  border-color: hsla(var(--hue), 40%, 58%, 0.85);
  background: hsla(var(--hue), 70%, 90%, 0.8);
}

.app-wheel-canvas {
  width: 100%;
  height: min(58vh, 470px);
  display: block;
  border-radius: 0.85rem;
  border: 1px solid hsla(var(--hue), 30%, 69%, 0.35);
  background: hsla(var(--hue), 40%, 97%, 1);
}

.app-segment-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 250px;
  overflow-y: auto;
}

.app-segment-item {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.46rem 0.56rem;
  background: hsla(var(--hue), 58%, 96%, 1);
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: center;
}

.site-footer {
  background: hsla(var(--hue), 28%, 12%, 1);
  color: hsla(var(--hue), 18%, 96%, 0.96);
}

.site-footer span {
  color: hsla(var(--hue), 18%, 96%, 0.96);
}

@media (max-width: 991.98px) {
  body {
    padding-top: 4.4rem;
  }

  .site-nav .navbar-collapse {
    margin-top: 0.8rem;
    padding: 0.8rem;
    border-radius: 0.75rem;
    background: hsla(var(--hue), 26%, 18%, 0.95);
  }

  .hero-shell {
    padding: 1.15rem;
  }

  .viz-canvas {
    height: 270px;
  }

  .viz-canvas-full {
    min-height: 360px;
  }

  .viz-canvas-ising-full {
    min-height: 460px;
  }

  .app-keyboard {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .app-control-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topic-manager {
    grid-template-columns: 1fr;
  }

  .mathlatex-parse-grid,
  .mathlatex-library-grid {
    grid-template-columns: 1fr;
  }

  .app-icon-toggle {
    align-self: stretch;
  }

  .app-teacher-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 575.98px) {
  .section-block {
    padding: 2.2rem 0;
  }

  .hero {
    padding-top: 1.7rem;
  }

  .stat-card,
  .project-card,
  .contact-card {
    padding: 1rem;
  }

  .viz-canvas {
    height: 250px;
  }

  .viz-canvas-full {
    min-height: 300px;
  }

  .viz-canvas-ising {
    height: 330px;
  }

  .viz-canvas-ising-full {
    min-height: 340px;
  }

  .viz-canvas-irodov {
    height: 320px;
  }

  .viz-tile-slider {
    min-height: 76px;
  }

  .viz-tile-text {
    padding: 0.58rem 0.72rem;
  }

  .problem-sheet {
    padding: 1rem;
  }

  .app-keyboard {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .app-head-minimal {
    flex-wrap: wrap;
  }

  .app-control-strip {
    grid-template-columns: 1fr;
  }

  .topic-editor-head,
  .topic-create-row,
  .topic-add-row,
  .topic-word-item {
    flex-wrap: wrap;
  }

  .app-input-row {
    flex-direction: column;
  }

  .app-settings-grid {
    grid-template-columns: 1fr;
  }
}