:root {
  color-scheme: light;
  --bg: #f3f7f5;
  --surface: #ffffff;
  --soft: #e9f4ef;
  --ink: #18252c;
  --muted: #61707a;
  --line: #d4e0db;
  --teal: #087a78;
  --teal-dark: #075d5d;
  --amber: #e5a627;
  --green: #2d8d60;
  --red: #b83d34;
  --shadow: 0 16px 34px rgba(24, 37, 44, 0.12);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
}

body {
  margin: 0;
  background:
    linear-gradient(120deg, rgba(8, 122, 120, 0.12), transparent 38%),
    var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, sans-serif;
  letter-spacing: 0;
}

body.login-page {
  background-color: var(--bg);
  background-image:
    linear-gradient(90deg, rgba(244, 250, 248, 0.18) 0%, rgba(232, 244, 241, 0.24) 48%, rgba(218, 235, 231, 0.34) 100%),
    url("../img/login-background.png");
  background-position: center, center;
  background-repeat: no-repeat;
  background-size: auto, cover;
  background-attachment: scroll, fixed;
}

body.login-page .app-shell {
  isolation: isolate;
}

body.login-page .topbar {
  border-bottom-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.54);
  box-shadow: 0 10px 30px rgba(24, 37, 44, 0.08);
}

body.portal-page {
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    linear-gradient(90deg, rgba(244, 250, 248, 0.72) 0%, rgba(232, 244, 241, 0.58) 44%, rgba(218, 235, 231, 0.46) 100%),
    url("../img/informatika-360-hero.png");
  background-position: center, center;
  background-repeat: no-repeat;
  background-size: auto, cover;
  background-attachment: scroll, fixed;
  font-family: var(--portal-font-family, "Segoe UI", system-ui, sans-serif);
}

.portal-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 100vh;
}

.portal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-width: 0;
  padding: 10px clamp(16px, 4vw, 52px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 10px 30px rgba(24, 37, 44, 0.08);
  backdrop-filter: blur(12px);
}

.portal-main {
  display: grid;
  align-items: start;
  min-width: 0;
  padding: clamp(16px, 3vw, 34px) clamp(16px, 4vw, 52px) clamp(18px, 4vw, 46px);
}

.portal-hero {
  display: grid;
  gap: clamp(14px, 2.4vw, 26px);
  width: min(1180px, 100%);
  margin: 0 auto;
}

.portal-copy {
  width: min(1120px, 100%);
  max-width: none;
}

.portal-copy h1 {
  max-width: none;
  margin-bottom: 8px;
  font-size: var(--portal-title-size, clamp(1.75rem, 3.8vw, 3.35rem));
  line-height: 1.08;
}

.portal-copy .lead {
  max-width: 620px;
  margin-bottom: 0;
  color: #354851;
  font-size: var(--portal-lead-size, clamp(0.98rem, 1.35vw, 1.12rem));
}

.portal-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.portal-resource-card {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 10px;
  min-height: 176px;
  min-width: 0;
  padding: 16px;
  border: 1px solid rgba(212, 224, 219, 0.78);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 16px 34px rgba(24, 37, 44, 0.12);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.portal-resource-card:hover,
.portal-resource-card:focus-visible {
  border-color: rgba(8, 122, 120, 0.45);
  box-shadow: 0 20px 42px rgba(24, 37, 44, 0.16);
  transform: translateY(-2px);
}

.portal-resource-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: #ffffff;
  font-size: 1.18rem;
  font-weight: 900;
}

.portal-card-teal .portal-resource-mark {
  background: var(--teal);
}

.portal-card-green .portal-resource-mark {
  background: var(--green);
}

.portal-card-amber .portal-resource-mark {
  background: var(--amber);
}

.portal-card-blue .portal-resource-mark {
  background: #2563eb;
}

.portal-card-sky .portal-resource-mark {
  background: #0284c7;
}

.portal-card-purple .portal-resource-mark {
  background: #7c3aed;
}

.portal-card-red .portal-resource-mark {
  background: var(--red);
}

.portal-card-rose .portal-resource-mark {
  background: #db2777;
}

.portal-card-slate .portal-resource-mark {
  background: #475569;
}

.portal-resource-body {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.portal-resource-body strong {
  color: var(--ink);
  font-size: var(--portal-card-title-size, clamp(1.22rem, 1.85vw, 1.58rem));
  line-height: 1.05;
}

.portal-resource-body small {
  color: var(--teal-dark);
  font-weight: 900;
}

.portal-resource-body em {
  color: var(--muted);
  font-style: normal;
  line-height: 1.4;
}

.portal-resource-action {
  color: var(--teal-dark);
  font-size: 0.9rem;
  font-weight: 900;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.12;
  overflow-wrap: anywhere;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(1.8rem, 3.2vw, 3.1rem);
}

h2 {
  margin-bottom: 10px;
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
}

p {
  line-height: 1.48;
}

sub,
sup {
  line-height: 0;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 100vh;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.header-topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 190px;
}

.brand-logo {
  display: block;
  width: 62px;
  height: 62px;
  object-fit: contain;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  color: var(--ink);
  font-size: clamp(1.18rem, 1.8vw, 1.55rem);
  line-height: 1.08;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
}

.login-logo {
  display: block;
  width: min(142px, 38vw);
  height: auto;
  margin: 0 auto;
  object-fit: contain;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.nav-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
}

.nav-group-title {
  padding: 0 4px 0 6px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.nav-link,
.button,
.lesson-link,
.mode-button,
.section-tab {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  transition: transform 150ms ease, border-color 150ms ease, background-color 150ms ease;
}

.nav-link,
.section-tab {
  display: inline-flex;
  align-items: center;
  padding: 0 9px;
  color: var(--muted);
  font-weight: 700;
}

.nav-link.is-active,
.section-tab.is-active {
  border-color: var(--teal);
  background: var(--soft);
  color: var(--teal-dark);
}

.button,
.mode-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  color: var(--ink);
  font-weight: 800;
}

.button-primary {
  border-color: var(--teal);
  background: var(--teal);
  color: #ffffff;
}

.button-danger {
  border-color: rgba(184, 61, 52, 0.38);
  background: #fff1ef;
  color: #842f26;
}

.button-danger:hover {
  border-color: var(--red);
  background: #ffe5e0;
}

.scroll-return {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 1200;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 999px;
  background: var(--teal);
  color: #ffffff;
  box-shadow: 0 12px 26px rgba(28, 64, 62, 0.2);
  cursor: pointer;
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.scroll-return.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-return:hover {
  background: var(--teal-dark);
}

.button.is-disabled {
  pointer-events: none;
  opacity: 0.45;
}

.top-logout {
  flex: 0 0 auto;
}

.nav-link:hover,
.button:hover,
.lesson-link:hover,
.mode-button:hover,
.section-tab:hover {
  transform: translateY(-1px);
}

.button:disabled,
.mode-button:disabled {
  cursor: default;
  opacity: 0.55;
  transform: none;
}

input,
select {
  width: 100%;
  min-height: 40px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
}

label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-weight: 700;
}

.screen-main {
  min-height: 0;
  padding: 14px 18px 18px;
}

.topic-screen {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
}

.home-screen,
.page-grid {
  min-height: calc(100vh - 86px);
  height: auto;
}

.home-screen {
  display: grid;
  grid-template-rows: minmax(0, 1fr) 152px;
  gap: 14px;
}

.hero-card,
.content-card,
.side-panel,
.module-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  min-height: 0;
  overflow: hidden;
}

.hero-card img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: cover;
}

.hero-copy {
  display: grid;
  align-content: center;
  padding: clamp(22px, 4vw, 46px);
}

.hero-copy p:not(.eyebrow) {
  max-width: 640px;
  color: var(--muted);
  font-size: 1.05rem;
}

.eyebrow {
  margin-bottom: 6px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.section-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topic-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 24px rgba(24, 37, 44, 0.08);
}

.topic-nav-title {
  display: grid;
  gap: 2px;
  min-width: 170px;
}

.topic-nav-title b {
  color: var(--ink);
}

.topic-nav-title small {
  color: var(--muted);
  font-weight: 700;
}

.topic-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  min-height: 0;
}

.module-card {
  display: grid;
  align-content: center;
  gap: 6px;
  padding: 16px;
  min-width: 0;
}

.module-card span {
  display: grid;
  place-items: center;
  width: 36px;
  height: 30px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-weight: 900;
}

.module-card strong {
  font-size: 1.08rem;
}

.module-card small {
  color: var(--muted);
  line-height: 1.35;
}

.page-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 14px;
}

.page-grid-tools {
  grid-template-columns: minmax(0, 1fr) 310px;
}

.page-grid-tools .content-card {
  gap: 10px;
  padding: 14px 16px;
}

.page-grid-tools .card-heading {
  align-items: center;
}

.page-grid-tools h1 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 2.7vw, 2.55rem);
}

.page-grid-tools .result-box {
  padding: 10px 14px;
}

.page-grid-tools .result-box strong {
  font-size: 1.75rem;
}

.page-grid-quiz {
  grid-template-columns: 260px minmax(0, 1fr);
}

.page-grid-practice {
  grid-template-columns: 442px minmax(0, 1fr);
}

.page-grid-auth {
  grid-template-columns: minmax(0, 1fr) 360px;
}

.page-grid-admin {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  gap: 8px;
}

.page-grid-vpr {
  grid-template-columns: 300px minmax(0, 1fr);
}

.side-panel,
.content-card {
  min-height: 0;
  overflow: auto;
  padding: 16px;
}

.content-card {
  display: grid;
  align-content: start;
  gap: 14px;
}

.card-heading {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}

.card-heading .button {
  flex: 0 0 auto;
  white-space: nowrap;
}

.lesson-list,
.mode-list,
.alphabet-list {
  display: grid;
  gap: 8px;
}

.lesson-link {
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: center;
  gap: 8px;
  padding: 7px;
  color: var(--ink);
  text-align: left;
}

.lesson-link span,
.alphabet-list b {
  display: grid;
  place-items: center;
  width: 32px;
  height: 30px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-weight: 900;
}

.lesson-link b {
  font-size: 0.88rem;
  line-height: 1.15;
}

.lesson-link.is-active,
.mode-button.is-active {
  border-color: var(--teal);
  background: var(--soft);
}

.theory-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.76fr);
  gap: 14px;
  min-height: 0;
}

.theory-structured,
.theory-full-content {
  display: grid;
  gap: 10px;
}

.theory-full-content .lead,
.theory-full-content .fact-grid,
.theory-full-content .mini-card,
.theory-full-content .example-line {
  margin: 0;
}

.theory-full-content .fact {
  margin: 0;
}

.lead {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 1rem;
}

.rich-copy {
  line-height: 1.48;
}

.rich-copy p,
.rich-copy div {
  margin: 0 0 8px;
}

.rich-copy :last-child {
  margin-bottom: 0;
}

.rich-copy ul,
.rich-copy ol {
  display: grid;
  gap: 5px;
  margin: 8px 0 0;
  padding-left: 22px;
}

.rich-copy a {
  color: var(--teal-dark);
  font-weight: 800;
  text-decoration: underline;
}

.rich-copy blockquote {
  margin: 8px 0;
  padding: 8px 12px;
  border-left: 3px solid var(--teal);
  background: #f4faf8;
  color: var(--muted);
}

.rich-copy pre,
.rich-copy code {
  border-radius: 6px;
  background: #f3f6f5;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}

.rich-copy pre {
  overflow: auto;
  padding: 10px;
  white-space: pre-wrap;
}

.rich-copy table {
  width: 100%;
  margin: 10px 0;
  border-collapse: collapse;
  background: #ffffff;
}

.rich-copy th,
.rich-copy td {
  padding: 8px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.rich-copy th {
  background: #f4faf8;
  color: var(--teal-dark);
}

.rich-copy iframe,
.rich-copy video,
.rich-copy audio {
  display: block;
  max-width: 100%;
  margin: 8px 0;
}

.rich-copy iframe {
  width: 100%;
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.rich-copy figure {
  display: grid;
  gap: 6px;
  margin: 8px 0;
}

.rich-copy figcaption {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.35;
}

.fact-grid,
.compact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.fact-grid {
  display: block;
}

.fact-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.fact-table th,
.fact-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.38;
}

.fact-table th {
  width: 28%;
  border-right: 1px solid var(--line);
  background: #f4faf8;
  color: var(--teal-dark);
  font-weight: 900;
}

.fact-table td {
  color: var(--muted);
}

.fact-table tr:last-child th,
.fact-table tr:last-child td {
  border-bottom: 0;
}

.fact,
.mini-card,
.example-line,
.result-box,
.message,
.note,
.score-card,
.score-big,
.question-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.fact {
  display: grid;
  gap: 4px;
  padding: 10px;
}

.fact strong {
  color: var(--teal-dark);
}

.fact span {
  color: var(--muted);
  line-height: 1.38;
}

.example-line {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 8px;
  align-items: center;
  margin-top: 10px;
  padding: 12px;
  background: #fff8e7;
}

.example-line span {
  color: #8a5a00;
  font-weight: 900;
}

.diagram-card {
  display: grid;
  align-content: center;
  gap: 12px;
  min-height: 330px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff, #f6fbf8);
}

.theory-layout .diagram-card {
  align-content: start;
}

.theory-support {
  display: grid;
  gap: 12px;
  align-content: start;
}

.theory-support h2 {
  margin: 0;
  font-size: 1.25rem;
}

.theory-support p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.support-note {
  display: grid;
  gap: 5px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.support-note b {
  color: var(--ink);
}

.support-steps {
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.35;
}

.quiz-theory-support {
  padding: 4px 0;
}

.side-material {
  display: grid;
  gap: 10px;
}

.side-material img,
.rich-editor-area img {
  display: block;
  max-width: 100%;
  max-height: 360px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.side-material img[data-size="small"],
.rich-editor-area img[data-size="small"] {
  width: min(180px, 100%);
}

.side-material img[data-size="medium"],
.rich-editor-area img[data-size="medium"] {
  width: min(320px, 100%);
}

.side-material img[data-size="large"],
.rich-editor-area img[data-size="large"] {
  width: min(520px, 100%);
}

.side-material img[data-size="full"],
.rich-editor-area img[data-size="full"] {
  width: 100%;
}

.side-material img.is-selected-inline-image {
  outline: 3px solid rgba(8, 122, 120, 0.34);
  outline-offset: 3px;
}

.topic-photo {
  display: grid;
  align-content: stretch;
  width: 100%;
  min-height: 100%;
  margin: 0;
}

.topic-photo img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 280px;
  max-height: 430px;
  border: 1px solid rgba(212, 224, 219, 0.9);
  border-radius: 8px;
  background: #ffffff;
  object-fit: cover;
  box-shadow: 0 12px 28px rgba(24, 37, 44, 0.1);
}

.page-grid-vpr .topic-photo img {
  min-height: 150px;
  max-height: 220px;
}

.quiz-illustration .topic-photo img {
  min-height: 220px;
}

.diagram-table {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.diagram-table span,
.diagram-table b {
  padding: 12px 8px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.diagram-table b {
  background: var(--soft);
  color: var(--teal-dark);
}

.bitline,
.digit-strip,
.group-demo {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

.bitline b,
.digit-strip span,
.group-demo span,
.group-demo strong {
  display: grid;
  place-items: center;
  min-width: 42px;
  height: 42px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-weight: 900;
}

.group-demo span {
  min-width: 92px;
  border-color: var(--amber);
  background: #fff8e7;
  color: #8a5a00;
}

.formula {
  margin: 0;
  padding: 12px;
  border-radius: 8px;
  background: #fff8e7;
  color: #624303;
  font-weight: 800;
  text-align: center;
}

.ladder {
  display: grid;
  gap: 8px;
}

.ladder span {
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  font-weight: 800;
}

.binary-sum {
  display: grid;
  justify-content: center;
  font: 900 2.4rem Consolas, monospace;
}

.binary-sum span,
.binary-sum strong {
  display: block;
  min-width: 210px;
  text-align: right;
}

.binary-sum i {
  height: 3px;
  margin: 4px 0;
  background: var(--ink);
}

.converter-form,
.answer-form {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) 130px 130px auto;
  gap: 10px;
  align-items: end;
}

.answer-form {
  grid-template-columns: minmax(260px, 1fr) auto;
}

.result-box {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px;
}

.result-box span {
  color: var(--muted);
  font-weight: 900;
}

.result-box strong {
  color: var(--teal-dark);
  font-size: 2rem;
}

.mini-card {
  padding: 12px;
}

.mini-card b {
  color: var(--teal-dark);
}

.mini-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-weight: 800;
}

.mini-card .rich-copy {
  color: var(--muted);
  font-weight: 800;
}

#converterDetails.compact-grid {
  grid-template-columns: 1fr;
}

.conversion-step {
  display: grid;
  gap: 10px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.conversion-title {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.conversion-title span {
  display: inline-grid;
  place-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
}

.conversion-title b {
  color: var(--teal-dark);
}

.conversion-hint {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.place-value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(136px, 1fr));
  gap: 8px;
}

.place-term {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 5px 8px;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.place-term small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.place-term span,
.place-term strong,
.place-term b {
  min-width: 0;
  overflow-wrap: anywhere;
  font-weight: 900;
}

.place-term strong,
.place-term b {
  color: var(--teal-dark);
}

.division-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 6px;
}

.division-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 8px;
  align-items: stretch;
  min-width: 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.division-row.division-head {
  display: none;
}

.division-row span,
.division-row strong {
  display: grid;
  align-items: center;
  min-height: 0;
  min-width: 0;
  padding: 0;
  border: 0;
  background: transparent;
  font-weight: 900;
}

.division-row span:first-child {
  grid-column: 1 / -1;
}

.division-row span:nth-child(2) {
  color: var(--muted);
  font-size: 0.88rem;
}

.division-row span:nth-child(2)::before {
  content: "частное ";
  font-weight: 700;
}

.division-row strong {
  justify-self: end;
  min-height: 26px;
  padding: 2px 8px;
  border-radius: 8px;
  background: #fff8e7;
  color: #8a5a00;
}

.division-row strong::before {
  content: "ост. ";
}

.division-answer {
  display: grid;
  align-content: center;
  gap: 4px;
  min-width: 0;
  padding: 8px;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 8px;
  background: var(--soft);
}

.division-answer span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 900;
}

.division-answer strong {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--teal-dark);
  font-size: 1.08rem;
  font-weight: 900;
}

.division-head span {
  background: var(--soft);
  color: var(--teal-dark);
  font-size: 0.82rem;
  text-transform: uppercase;
}

.remainder-read {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 10px;
  border-radius: 8px;
  background: var(--soft);
}

.remainder-read span {
  color: var(--muted);
  font-weight: 900;
}

.remainder-read b,
.remainder-read strong {
  display: inline-grid;
  place-items: center;
  min-height: 34px;
  min-width: 34px;
  padding: 0 9px;
  border-radius: 8px;
  background: #ffffff;
  color: var(--teal-dark);
  font-weight: 900;
}

.group-map {
  display: grid;
  gap: 8px;
}

.group-map-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.group-map-label {
  min-width: 64px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
}

.group-token {
  display: inline-grid;
  place-items: center;
  min-height: 38px;
  min-width: 46px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--teal-dark);
  font-family: Consolas, "Courier New", monospace;
  font-weight: 900;
}

.group-token.bits {
  min-width: 70px;
  border-color: rgba(229, 166, 39, 0.55);
  background: #fff8e7;
  color: #8a5a00;
}

.page-grid-tools .conversion-step {
  gap: 8px;
  padding: 10px;
}

.theory-deep {
  margin-top: 10px;
}

.theory-deep p {
  font-weight: 600;
}

.theory-deep .rich-copy {
  font-weight: 600;
}

.mistake-note {
  margin-top: 10px;
  padding: 10px;
  border-radius: 8px;
  background: #fff8e7;
  color: #624303 !important;
}

.alphabet-list div {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 8px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.alphabet-list span {
  color: var(--muted);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.note,
.message {
  margin-top: 10px;
  padding: 12px;
  color: var(--muted);
}

.note p {
  margin-bottom: 8px;
}

.note p:last-child,
.message p:last-child {
  margin-bottom: 0;
}

.message-good {
  border-color: rgba(45, 141, 96, 0.45);
  background: #edf8f2;
  color: #1d6542;
}

.message-bad {
  border-color: rgba(184, 61, 52, 0.38);
  background: #fff1ef;
  color: #842f26;
}

.mode-button {
  width: 100%;
}

.score-card {
  display: grid;
  gap: 8px;
  margin: 12px 0;
  padding: 12px;
}

.score-card span {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
}

.score-card b {
  color: var(--teal-dark);
}

.task-card {
  align-content: center;
}

.vpr-card {
  align-content: start;
}

.vpr-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.75fr);
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: 12px;
  min-height: 0;
}

.vpr-layout .trainer-box {
  grid-column: 1 / -1;
}

.vpr-illustration {
  min-height: 180px;
}

.page-grid-vpr {
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 10px;
}

.page-grid-vpr .side-panel,
.page-grid-vpr .content-card {
  padding: 12px;
}

.page-grid-vpr .content-card {
  gap: 10px;
}

.page-grid-vpr .card-heading {
  align-items: start;
}

.page-grid-vpr .card-heading h1 {
  margin-bottom: 0;
  font-size: clamp(1.45rem, 2vw, 2rem);
  line-height: 1.08;
}

.page-grid-theory .card-heading h1,
.page-grid-quiz .card-heading h1,
.page-grid-practice .card-heading h1 {
  font-size: clamp(1.45rem, 2vw, 2rem);
  line-height: 1.08;
}

.page-grid-vpr .eyebrow {
  margin-bottom: 6px;
  font-size: 0.78rem;
}

.page-grid-vpr .task-label {
  margin-bottom: 4px;
  font-size: 0.78rem;
}

.page-grid-vpr .lesson-list {
  gap: 6px;
}

.page-grid-vpr .lesson-link {
  grid-template-columns: 30px 1fr;
  min-height: 32px;
  gap: 6px;
  padding: 5px;
}

.page-grid-vpr .lesson-link span {
  width: 26px;
  height: 24px;
  border-radius: 6px;
  font-size: 0.78rem;
}

.page-grid-vpr .lesson-link b {
  font-size: 0.8rem;
  line-height: 1.12;
}

.vpr-layout {
  grid-template-columns: minmax(210px, 0.72fr) minmax(300px, 1.08fr) minmax(270px, 0.9fr);
  grid-template-rows: minmax(0, 1fr);
  gap: 8px;
  align-items: start;
}

.page-grid-vpr .vpr-layout > .vpr-choice-column {
  grid-column: 1;
  grid-row: 1;
}

.page-grid-vpr .vpr-layout > .vpr-example-card {
  grid-column: 2;
  grid-row: 1;
}

.page-grid-vpr .vpr-layout > .vpr-illustration {
  grid-column: 3;
  grid-row: 1;
}

.page-grid-vpr .question-box,
.page-grid-vpr .mini-card,
.page-grid-vpr .diagram-card {
  padding: 10px;
}

.page-grid-vpr .task-title {
  margin-bottom: 6px;
  font-size: clamp(0.98rem, 1.25vw, 1.18rem);
  line-height: 1.24;
}

.page-grid-vpr .rich-copy,
.page-grid-vpr .step-list,
.page-grid-vpr .message {
  font-size: 0.9rem;
}

.page-grid-vpr .step-list {
  gap: 4px;
  margin-top: 6px;
  padding-left: 18px;
  line-height: 1.3;
}

.page-grid-vpr .mini-card .rich-copy {
  font-weight: 700;
}

.page-grid-vpr .vpr-illustration {
  min-height: 136px;
  align-content: start;
}

.page-grid-vpr .vpr-example-answer {
  margin-top: 10px;
}

.page-grid-vpr .vpr-example-answer .rich-copy {
  margin-top: 4px;
}

.page-grid-vpr .tox-tinymce {
  overflow: hidden;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 8px;
  background: #ffffff;
}

.page-grid-vpr .tox .tox-toolbar,
.page-grid-vpr .tox .tox-toolbar__primary,
.page-grid-vpr .tox .tox-toolbar-overlord {
  background: #fbfdfc;
}

.page-grid-vpr .mini-diagram {
  gap: 6px;
}

.page-grid-vpr .mini-diagram-row {
  gap: 6px;
  padding: 6px 8px;
  font-size: 0.84rem;
}

.page-grid-vpr .mini-diagram-flow {
  gap: 6px;
}

.page-grid-vpr .mini-diagram-flow span,
.page-grid-vpr .mini-diagram-flow strong,
.page-grid-vpr .logic-gate {
  padding: 6px 8px;
  font-size: 0.82rem;
}

.page-grid-vpr .mini-diagram-caption {
  margin-bottom: 0;
  font-size: 0.82rem;
  line-height: 1.3;
}

.page-grid-vpr .trainer-box {
  display: grid;
  gap: 8px;
  padding: 10px;
}

.page-grid-vpr .trainer-box h2 {
  margin-bottom: 0;
  font-size: clamp(0.98rem, 1.25vw, 1.14rem);
  line-height: 1.22;
}

.vpr-practice-choices {
  display: grid;
  grid-template-columns: repeat(5, minmax(34px, 1fr));
  gap: 6px;
  align-items: stretch;
}

.vpr-practice-choice {
  display: grid;
  place-items: center;
  min-height: 34px;
  border: 1px solid rgba(8, 122, 120, 0.32);
  border-radius: 8px;
  background: #ffffff;
  color: var(--teal-dark);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 900;
  line-height: 1;
}

.vpr-practice-choice.is-active {
  border-color: var(--teal);
  background: var(--teal);
  color: #ffffff;
}

.page-grid-vpr .answer-form {
  grid-template-columns: minmax(180px, 1fr) auto;
  gap: 8px;
}

.page-grid-vpr .answer-form label {
  gap: 3px;
  font-size: 0.86rem;
}

.page-grid-vpr input {
  min-height: 34px;
}

.page-grid-vpr .button {
  min-height: 34px;
  padding: 0 12px;
  font-size: 0.9rem;
}

.page-grid-vpr .message {
  margin-top: 0;
  padding: 8px 10px;
  line-height: 1.34;
}

.step-list {
  display: grid;
  gap: 7px;
  margin: 10px 0 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.38;
}

.step-list li::marker {
  color: var(--teal-dark);
  font-weight: 900;
}

.mini-diagram {
  display: grid;
  gap: 8px;
}

.mini-diagram-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  font-weight: 800;
}

.mini-diagram-row strong {
  color: var(--teal-dark);
}

.mini-diagram-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

.mini-diagram-flow span,
.mini-diagram-flow strong {
  display: grid;
  place-items: center;
  min-height: 38px;
  min-width: 48px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  font-weight: 900;
}

.mini-diagram-flow strong {
  background: var(--soft);
  color: var(--teal-dark);
}

.mini-diagram-caption {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}

.logic-truth-table {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 8px;
  background: #ffffff;
}

.logic-truth-table th,
.logic-truth-table td {
  padding: 8px 7px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: center;
  font-weight: 900;
}

.logic-truth-table th {
  background: var(--soft);
  color: var(--teal-dark);
}

.logic-truth-table td {
  color: var(--muted);
}

.logic-truth-table th:last-child,
.logic-truth-table td:last-child {
  border-right: 0;
}

.logic-truth-table tr:last-child td {
  border-bottom: 0;
}

.logic-gate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 8px;
}

.logic-gate,
.logic-signal {
  display: grid;
  gap: 6px;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.logic-gate b,
.logic-signal b {
  color: var(--teal-dark);
  font-size: 1.08rem;
}

.logic-gate span,
.logic-signal span {
  color: var(--muted);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.logic-gates-diagram {
  gap: 10px;
}

.gate-visual-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.gate-visual-card {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.gate-visual-card > b {
  color: var(--teal-dark);
  text-align: center;
}

.gate-svg {
  width: 100%;
  aspect-ratio: 2 / 1;
  min-height: 82px;
}

.gate-svg line,
.gate-svg path,
.gate-svg circle {
  fill: #f7fcfa;
  stroke: var(--teal-dark);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.gate-svg line {
  fill: none;
}

.gate-svg text {
  fill: var(--ink);
  font-size: 15px;
  font-weight: 900;
}

.gate-table th,
.gate-table td {
  padding: 5px 4px;
  font-size: 0.86rem;
}

.definition-strip {
  padding: 10px;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-weight: 900;
  line-height: 1.35;
  text-align: center;
}

.microchip-image {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
  object-fit: contain;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.logic-device-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.logic-device-card {
  display: grid;
  gap: 5px;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.logic-device-card b {
  color: var(--teal-dark);
}

.logic-device-card span {
  color: var(--muted);
  font-weight: 800;
}

.logic-signal {
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  text-align: center;
}

.octhex-diagram {
  align-content: center;
}

.octhex-diagram .conversion-title {
  justify-content: center;
}

.octhex-diagram .group-map {
  gap: 6px;
}

.octhex-diagram .group-map-row {
  justify-content: center;
}

.octhex-diagram .group-map-label {
  min-width: 34px;
}

.task-label {
  margin-bottom: 6px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.question-box {
  padding: 18px;
}

.question-box p {
  margin-bottom: 0;
  color: var(--muted);
}

.task-title {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  font-weight: 900;
  line-height: 1.18;
}

.quiz-form {
  display: grid;
  gap: 14px;
}

.quiz-theory {
  margin: 0;
}

.quiz-theory p {
  margin-bottom: 10px;
}

.quiz-illustration {
  display: grid;
  gap: 8px;
}

.login-form,
.student-form {
  display: grid;
  gap: 10px;
}

.student-form input[type="file"] {
  min-height: 42px;
  padding: 9px 10px;
}

.login-screen {
  display: grid;
  place-items: center;
  min-height: 0;
}

body.login-page .login-screen {
  min-height: calc(100vh - 60px);
  padding: clamp(18px, 4vw, 46px);
  place-items: center;
}

.login-panel {
  width: min(520px, 100%);
  padding: clamp(22px, 4vw, 36px);
}

body.login-page .login-panel {
  position: relative;
  isolation: isolate;
  width: min(460px, 100%);
  overflow: hidden;
  transform: translateX(clamp(120px, 16vw, 300px));
  padding: 76px clamp(22px, 3vw, 30px) clamp(22px, 3vw, 30px);
  border-color: rgba(255, 255, 255, 0.78);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(246, 252, 250, 0.9)),
    rgba(255, 255, 255, 0.9);
  box-shadow: 0 24px 60px rgba(12, 44, 55, 0.28);
  backdrop-filter: blur(18px);
}

body.login-page .login-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 54px;
  background:
    radial-gradient(circle at 28px 50%, #ff766f 0 5px, transparent 6px),
    radial-gradient(circle at 50px 50%, #f4c84e 0 5px, transparent 6px),
    radial-gradient(circle at 72px 50%, #24b8a6 0 5px, transparent 6px),
    linear-gradient(90deg, rgba(8, 122, 120, 0.14), rgba(88, 169, 205, 0.1));
  border-bottom: 1px solid rgba(8, 122, 120, 0.14);
}

body.login-page .login-panel::after {
  content: "";
  position: absolute;
  inset: 54px 0 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(8, 122, 120, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 122, 120, 0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.72), transparent 70%);
}

body.login-page .login-panel > * {
  position: relative;
  z-index: 1;
}

.login-panel h1 {
  margin-bottom: 8px;
}

body.login-page .login-panel h1 {
  font-size: clamp(2rem, 4vw, 2.65rem);
}

body.login-page .login-panel .eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border: 1px solid rgba(8, 122, 120, 0.18);
  border-radius: 999px;
  background: rgba(233, 244, 239, 0.9);
}

body.login-page .login-panel .lead {
  color: #4c616b;
}

body.login-page .login-form {
  gap: 12px;
  margin-top: 4px;
}

body.login-page .login-panel input {
  min-height: 46px;
  border-color: rgba(8, 122, 120, 0.24);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

body.login-page .login-panel input:focus {
  outline: 3px solid rgba(8, 122, 120, 0.16);
  border-color: var(--teal);
}

body.login-page .login-panel .button-primary {
  width: 100%;
  min-height: 46px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--teal), #0a9b96);
  box-shadow: 0 12px 26px rgba(8, 122, 120, 0.24);
}

body.login-page .login-panel .message {
  border-color: rgba(8, 122, 120, 0.18);
  background: rgba(233, 244, 239, 0.82);
}

.login-session {
  display: grid;
  gap: 10px;
  color: var(--muted);
}

.login-session p {
  margin-bottom: 0;
}

.login-session:empty {
  display: none;
}

body.is-authenticated .login-panel {
  display: none !important;
}

body.is-authenticated .topic-dashboard {
  display: grid !important;
}

.topic-dashboard {
  display: grid;
  gap: 16px;
  width: min(1120px, 100%);
}

.topic-dashboard[hidden] {
  display: none;
}

.dashboard-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 14px;
}

.dashboard-heading h1 {
  margin-bottom: 6px;
}

.topic-class-list {
  display: grid;
  gap: 18px;
}

.topic-class-group {
  display: grid;
  gap: 10px;
}

.topic-class-heading {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topic-class-heading::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line);
}

.topic-class-heading h2 {
  margin-bottom: 0;
  color: var(--teal-dark);
  font-size: 1.05rem;
}

.topic-widget-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.topic-widget {
  display: grid;
  grid-template-rows: minmax(0, 180px) auto;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow);
  transition: transform 150ms ease, border-color 150ms ease;
}

.topic-widget img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: cover;
  background: var(--soft);
}

.topic-widget:hover {
  transform: translateY(-2px);
  border-color: var(--teal);
}

.topic-widget span {
  display: grid;
  gap: 5px;
  padding: 14px;
}

.topic-widget b {
  color: var(--ink);
  font-size: 1.08rem;
  line-height: 1.22;
}

.topic-widget small {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.auth-card,
.auth-side,
.guard-card {
  align-content: center;
}

.auth-card {
  max-width: 780px;
  width: 100%;
}

.auth-side {
  gap: 14px;
}

.auth-note {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
}

.auth-note .button {
  width: fit-content;
}

.auth-demo {
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.auth-demo p {
  margin-bottom: 0;
  color: var(--muted);
}

.admin-card {
  overflow: hidden;
  padding: 10px;
}

.admin-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.42fr) minmax(0, 1.58fr);
  gap: 8px;
  min-height: 0;
}

.admin-panel {
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.admin-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.admin-tab-panel {
  min-height: 0;
}

.admin-two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.admin-subpanel {
  display: grid;
  gap: 10px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.class-create-panel {
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 8px 12px;
  padding: 10px 12px;
}

.class-create-form {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
}

.class-create-header {
  display: flex;
  align-items: end;
  gap: 10px;
  min-width: 0;
}

.class-create-header h2,
.class-create-header .eyebrow {
  margin-bottom: 0;
}

.class-create-header h2 {
  font-size: 1.02rem;
}

.class-create-form label span {
  display: none;
}

.class-create-panel .message {
  grid-column: 1 / -1;
  padding: 6px 10px;
}

.import-box {
  display: grid;
  gap: 6px;
  padding-top: 7px;
  border-top: 1px solid var(--line);
}

.access-box {
  display: grid;
  gap: 6px;
  padding-top: 7px;
  border-top: 1px solid var(--line);
}

.access-list {
  display: grid;
  gap: 4px;
}

.access-row {
  display: grid;
  grid-template-columns: minmax(54px, 0.8fr) repeat(3, minmax(0, 1fr)) auto;
  gap: 6px;
  align-items: center;
  padding: 5px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.access-row b {
  color: var(--teal-dark);
}

.access-row label {
  display: flex;
  gap: 5px;
  align-items: center;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.access-row input {
  width: 16px;
  height: 16px;
  min-height: 16px;
}

.access-row .button {
  min-height: 28px;
  padding: 0 8px;
  font-size: 0.8rem;
}

.admin-count {
  display: inline-grid;
  place-items: center;
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid rgba(8, 122, 120, 0.25);
  border-radius: 8px;
  background: #ffffff;
  color: var(--teal-dark);
  font-size: 0.82rem;
  font-weight: 900;
}

.access-toolbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
}

.access-toolbar label {
  width: min(420px, 100%);
}

.access-class-list {
  display: grid;
  gap: 12px;
  min-height: 0;
}

.student-class-list {
  display: grid;
  gap: 12px;
  min-height: 0;
}

.student-class-card {
  display: grid;
  gap: 10px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.access-class-card {
  display: grid;
  gap: 10px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.access-class-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.access-class-head h3 {
  margin-bottom: 0;
  color: var(--teal-dark);
  font-size: 1.18rem;
}

.access-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.button-compact {
  min-height: 30px;
  padding: 0 9px;
  font-size: 0.78rem;
}

.access-matrix-form {
  display: grid;
  gap: 10px;
  min-width: 0;
  overflow: hidden;
}

.access-matrix-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.access-matrix-wrap {
  width: 100%;
  max-width: 100%;
  max-height: min(62vh, 620px);
  min-height: 220px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.access-matrix {
  width: max-content;
  min-width: 0;
  table-layout: fixed;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.72rem;
}

.access-class-col {
  width: 148px;
}

.access-section-col {
  width: 112px;
}

.access-matrix th,
.access-matrix td {
  padding: 5px 6px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #ffffff;
  vertical-align: middle;
}

.access-matrix thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--soft);
  color: var(--teal-dark);
}

.access-matrix thead .access-section-head {
  top: 28px;
}

.access-grade-head {
  height: 28px;
  padding: 4px 6px;
  border-bottom-color: rgba(8, 122, 120, 0.22);
  background: #dff0ea !important;
  color: var(--teal-dark);
  font-size: 0.78rem;
  line-height: 1.1;
  text-align: center;
  text-transform: uppercase;
  z-index: 4 !important;
}

.access-matrix .access-class-cell {
  position: sticky;
  left: 0;
  z-index: 2;
  width: 148px;
  min-width: 148px;
  max-width: 148px;
  background: #fbfdfc;
  text-align: left;
}

.access-matrix thead .access-class-cell {
  top: 0;
  z-index: 5;
  background: var(--soft);
}

.access-matrix tbody .access-class-cell {
  display: grid;
  gap: 4px;
}

.access-matrix tbody .access-class-cell b {
  color: var(--teal-dark);
  font-size: 0.92rem;
  line-height: 1.05;
}

.access-matrix tbody .access-class-cell span {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
}

.access-row-actions {
  display: flex;
  gap: 4px;
}

.access-row-actions .button-compact {
  min-height: 26px;
  padding: 0 8px;
  font-size: 0.72rem;
}

.access-section-head {
  width: 112px;
  min-width: 112px;
  max-width: 112px;
  text-align: center;
}

.access-section-number {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  margin-bottom: 3px;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 999px;
  background: #ffffff;
  color: var(--teal-dark);
  font-size: 0.7rem;
  font-weight: 900;
}

.access-section-title {
  display: -webkit-box;
  overflow: hidden;
  line-height: 1.12;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.matrix-check {
  display: grid;
  place-items: center;
  min-height: 28px;
  cursor: pointer;
}

.matrix-check input {
  width: 18px;
  height: 18px;
  min-height: 18px;
}

.matrix-check span {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.access-section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  max-height: 360px;
  min-height: 0;
  overflow: auto;
  padding: 2px;
}

.access-section-option {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  min-width: 0;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
  cursor: pointer;
}

.access-section-option:hover {
  border-color: rgba(8, 122, 120, 0.32);
  background: var(--soft);
}

.access-section-option input {
  width: 18px;
  height: 18px;
  min-height: 18px;
  margin-top: 2px;
}

.access-section-option span {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.access-section-option b,
.access-section-option small {
  overflow-wrap: anywhere;
}

.access-section-option b {
  color: var(--ink);
  line-height: 1.25;
}

.access-section-option small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
}

.material-editor-layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: 12px;
  min-height: 0;
}

.material-picker,
.material-form {
  display: grid;
  align-content: start;
  gap: 10px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.material-picker form,
.material-form {
  display: grid;
  gap: 10px;
}

.material-form textarea[name="materialDetail"] {
  min-height: 150px;
}

.material-form textarea[name="materialFacts"],
.material-form textarea[name="materialSteps"] {
  min-height: 112px;
}

.rich-editor {
  display: grid;
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.rich-editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 6px;
  border-bottom: 1px solid var(--line);
  background: #fbfdfc;
}

.rich-editor-toolbar button {
  display: inline-grid;
  place-items: center;
  min-width: 32px;
  min-height: 30px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-weight: 900;
}

.rich-editor-toolbar button:hover,
.rich-editor-toolbar button:focus-visible {
  border-color: var(--teal);
  color: var(--teal-dark);
}

.rich-editor-toolbar .script-button {
  min-width: 36px;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1;
}

.rich-editor-area {
  min-height: 112px;
  padding: 10px;
  color: var(--ink);
  font-weight: 600;
  outline: none;
  overflow-wrap: anywhere;
}

.rich-editor-area:focus {
  box-shadow: inset 0 0 0 2px rgba(8, 122, 120, 0.2);
}

.rich-editor-area p,
.rich-editor-area div {
  margin: 0 0 8px;
}

.rich-editor-area :last-child {
  margin-bottom: 0;
}

.rich-editor-area ul,
.rich-editor-area ol {
  display: grid;
  gap: 5px;
  margin: 8px 0 0;
  padding-left: 22px;
}

.rich-editor-source {
  display: none;
}

.material-image-box {
  display: grid;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.material-image-box figure {
  display: grid;
  gap: 8px;
  margin: 0;
}

.material-image-box img {
  display: block;
  width: 100%;
  max-height: 260px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.inline-check {
  display: inline-flex !important;
  align-items: center;
  gap: 8px !important;
}

.inline-check input {
  width: 18px;
  height: 18px;
  min-height: 18px;
}

.lesson-custom-image {
  display: grid;
  gap: 6px;
  margin: 0;
}

.lesson-custom-image img {
  display: block;
  width: 100%;
  max-height: 280px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.lesson-default-diagram {
  display: grid;
  gap: 8px;
}

.message-list {
  margin: 8px 0 0 18px;
  color: inherit;
}

.message-list li {
  margin: 3px 0;
}

.panel-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 6px;
}

.panel-heading h2 {
  margin-bottom: 0;
  font-size: clamp(0.95rem, 1.1vw, 1.08rem);
}

.compact-lead {
  margin-bottom: 0;
  font-size: 0.8rem;
}

.result-filter {
  display: grid;
  grid-template-columns: minmax(140px, 220px) auto;
  gap: 8px;
  align-items: end;
}

.result-filter label {
  display: grid;
  gap: 3px;
}

.result-filter select {
  min-height: 32px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
}

.table-wrap {
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.results-table-wrap {
  max-height: min(65vh, 610px);
}

.practice-card {
  display: grid;
  gap: 14px;
}

.practice-create-panel[open],
.practice-assignment-card {
  display: grid;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.practice-create-panel {
  display: block;
}

.practice-create-panel:not([open]) {
  padding: 0;
  border: 0;
  background: transparent;
}

.practice-create-summary {
  display: inline-flex;
  list-style: none;
  cursor: pointer;
}

.practice-create-summary::-webkit-details-marker {
  display: none;
}

.practice-create-panel[open] .practice-create-summary {
  margin-bottom: 12px;
}

.practice-create-body {
  display: grid;
  gap: 12px;
}

.practice-form,
.practice-answer-form,
.practice-grade-form {
  display: grid;
  gap: 10px;
}

.practice-form label,
.practice-answer-form label,
.practice-grade-form label {
  display: grid;
  gap: 4px;
}

.practice-form input,
.practice-form select,
.practice-form textarea,
.practice-answer-form input,
.practice-grade-form input {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
}

.practice-form input[type="file"],
.practice-answer-form input[type="file"] {
  padding: 8px;
}

.practice-settings-grid,
.practice-submit-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.practice-assignment-list {
  display: grid;
  gap: 12px;
}

.practice-assignment-nav .lesson-link {
  gap: 5px;
}

.practice-nav-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  align-items: center;
}

.practice-sort-actions {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.practice-sort-actions form {
  display: inline-flex;
}

.practice-sort-actions .button {
  min-width: 30px;
  min-height: 28px;
  padding: 0 6px;
  font-size: 0.86rem;
  line-height: 1;
}

.practice-sort-actions .button:disabled {
  cursor: default;
  opacity: 0.35;
}

.practice-assignment-nav .lesson-link small {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.practice-assignment-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.practice-assignment-head h2 {
  margin: 0;
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
}

.practice-stat-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.practice-stat-row span,
.practice-grade-pill,
.practice-status {
  display: inline-grid;
  place-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
}

.practice-grade-pill.is-graded,
.practice-status.is-submitted {
  border-color: rgba(45, 141, 96, 0.4);
  background: #edf8f2;
  color: #1d6542;
}

.practice-description {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.practice-files-block,
.practice-grade-box {
  display: grid;
  gap: 6px;
}

.practice-file-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.practice-file-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.practice-file-list a {
  color: var(--teal-dark);
  font-weight: 900;
}

.practice-file-list span,
.practice-meta {
  color: var(--muted);
  font-size: 0.78rem;
}

.practice-submissions-wrap {
  max-height: 520px;
}

.practice-submissions-table td > span {
  display: block;
  margin-top: 3px;
}

.practice-grade-form {
  grid-template-columns: minmax(90px, 0.35fr) minmax(160px, 1fr) auto;
  align-items: end;
}

.practice-delete-form {
  justify-self: end;
}

.practice-grade-box {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.practice-grade-box strong {
  color: var(--teal-dark);
  font-size: 1.08rem;
}

.page-grid-practice .tox-tinymce {
  overflow: hidden;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 8px;
}

.data-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.76rem;
}

.data-table th,
.data-table td {
  padding: 5px 6px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--soft);
  color: var(--teal-dark);
  font-size: 0.66rem;
  text-transform: uppercase;
}

.data-table td {
  color: var(--muted);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

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

.student-actions {
  width: 116px;
  text-align: right;
  white-space: nowrap;
}

.student-actions .inline-action-form {
  justify-content: flex-end;
  width: 100%;
}

.gradebook-table {
  width: max-content;
  min-width: 100%;
}

.gradebook-table th,
.gradebook-table td {
  text-align: center;
  white-space: nowrap;
}

.gradebook-table .assignment-title {
  min-width: 150px;
  max-width: 190px;
  white-space: normal;
  line-height: 1.2;
}

.gradebook-table th:first-child,
.gradebook-table td:first-child {
  min-width: 190px;
  max-width: 260px;
  text-align: left;
  white-space: normal;
}

.gradebook-grade {
  color: var(--teal-dark);
  font-weight: 900;
}

.admin-panel .student-form {
  gap: 6px;
}

.admin-panel .message {
  margin-top: 0;
  padding: 8px 10px;
  font-size: 0.82rem;
  line-height: 1.35;
}

.admin-panel .button {
  min-height: 32px;
  padding: 0 10px;
  font-size: 0.84rem;
}

.admin-panel label {
  gap: 3px;
  font-size: 0.82rem;
}

.admin-panel input,
.admin-panel select,
.admin-panel textarea {
  min-height: 34px;
  padding: 0 8px;
}

.admin-panel textarea {
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  resize: vertical;
}

.admin-panel select {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
}

.admin-panel input[type="file"] {
  min-height: 34px;
  padding: 5px 8px;
}

.student-add-form {
  grid-template-columns: minmax(0, 1.55fr) minmax(72px, 0.45fr) auto;
  align-items: end;
}

.student-import-form {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
}

.grade-value {
  display: inline-grid;
  place-items: center;
  min-width: 24px;
  min-height: 24px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-size: 0.9rem;
}

.progress-pill {
  display: inline-grid;
  place-items: center;
  min-width: 40px;
  min-height: 22px;
  padding: 0 8px;
  border: 1px solid rgba(8, 122, 120, 0.25);
  border-radius: 8px;
  background: #ffffff;
  color: var(--teal-dark);
  font-weight: 900;
}

.practice-grade.is-pending {
  color: var(--amber);
  font-weight: 900;
}

.gradebook-practice-value {
  display: block;
}

.gradebook-practice-links {
  display: grid;
  gap: 4px;
  margin-top: 6px;
  justify-items: center;
}

.gradebook-practice-links a {
  color: var(--teal-dark);
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1.25;
  text-decoration: underline;
}

.gradebook-practice-form {
  display: inline-flex;
  gap: 4px;
  width: auto;
  margin-top: 7px;
  align-items: center;
  justify-content: center;
}

.gradebook-practice-form input {
  flex: 0 0 54px;
  width: 54px;
  max-width: 54px;
  min-height: 26px;
  padding: 3px 5px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-size: 0.72rem;
  text-align: center;
}

.gradebook-practice-form .button {
  min-height: 26px;
  padding: 3px 6px;
  font-size: 0.68rem;
}

.truth-card {
  overflow: hidden;
}

.truth-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
}

.truth-table-box {
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.truth-builder-table {
  width: max-content;
  min-width: 100%;
}

.truth-builder-table th {
  white-space: nowrap;
}

.truth-step-header {
  min-width: 116px;
}

.truth-answer-cell {
  min-width: 74px;
  vertical-align: top;
}

.truth-cell-input {
  width: 56px;
  min-height: 34px;
  padding: 0;
  text-align: center;
  font-weight: 900;
}

.truth-cell-input.is-correct {
  border-color: rgba(45, 141, 96, 0.65);
  background: #edf8f2;
  color: #1d6542;
}

.truth-cell-input.is-wrong {
  border-color: rgba(184, 61, 52, 0.55);
  background: #fff1ef;
  color: #842f26;
}

.truth-expected {
  display: block;
  min-height: 14px;
  margin-top: 4px;
  color: #842f26;
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1.1;
  white-space: nowrap;
}

.option-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.option-list {
  display: grid;
  max-width: 680px;
  gap: 8px;
}

.option {
  display: grid;
  grid-template-columns: 22px 1fr;
  align-items: center;
  min-height: 54px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
}

.option input {
  min-height: auto;
}

.answer-input {
  max-width: 420px;
}

.teacher-material-editor {
  display: grid;
  gap: 12px;
  margin-top: 12px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.teacher-material-editor[hidden] {
  display: none;
}

.inline-material-form {
  background: #ffffff;
}

.teacher-material-editor .inline-material-form {
  padding: 0;
  border: 0;
  background: transparent;
}

.teacher-material-editor .inline-material-form .action-row {
  margin: 0;
}

.is-inline-editable {
  min-height: 1.35em;
  outline: 2px dashed rgba(8, 122, 120, 0.28);
  outline-offset: 3px;
  border-radius: 6px;
}

.is-inline-editable:focus {
  outline-style: solid;
  outline-color: rgba(8, 122, 120, 0.62);
  background: #ffffff;
}

.diagram-card.is-inline-editing {
  min-height: 220px;
  align-content: stretch;
}

.diagram-card.is-inline-editing .side-material {
  min-height: 180px;
  padding: 8px;
}

.theory-card .tox-tinymce {
  overflow: hidden;
  border: 1px solid rgba(8, 122, 120, 0.28);
  border-radius: 8px;
  background: #ffffff;
}

.theory-card .tox .tox-toolbar,
.theory-card .tox .tox-toolbar__primary,
.theory-card .tox .tox-toolbar-overlord {
  background: #fbfdfc;
}

.teacher-settings-box {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.teacher-settings-box h3 {
  margin-bottom: 0;
  color: var(--teal-dark);
}

.admin-account-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.admin-account-grid label:nth-child(3),
.admin-account-grid label:nth-child(5) {
  grid-column: 1 / -1;
}

.question-manager {
  display: grid;
  grid-template-columns: minmax(190px, 0.42fr) minmax(560px, 1.58fr);
  gap: 12px;
  align-items: start;
}

.question-browser,
.question-workspace,
.question-editor-form {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.question-browser {
  display: grid;
  gap: 14px;
}

.question-workspace {
  display: grid;
  gap: 10px;
}

.question-grade-list,
.question-section-list,
.question-list {
  display: grid;
  gap: 7px;
}

.question-nav-button,
.question-row {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.question-nav-button {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  min-height: 38px;
  padding: 7px 9px;
  font-weight: 900;
}

.question-nav-button span {
  color: var(--muted);
  font-size: 0.82rem;
}

.question-nav-button.is-active,
.question-row.is-active {
  border-color: rgba(8, 122, 120, 0.5);
  background: var(--soft);
}

.question-toolbar {
  display: grid;
  grid-template-columns: minmax(170px, 260px) max-content;
  gap: 10px;
  align-items: end;
  justify-content: start;
}

.question-import-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
  margin-bottom: 8px;
  padding: 10px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.question-import-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.question-import-note {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.question-row {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 8px;
  padding: 9px;
}

.question-row-index {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-weight: 900;
}

.question-row-main {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.question-row-main b,
.question-row-main span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.question-row-main span {
  color: var(--muted);
  font-size: 0.9rem;
}

.question-row-meta {
  grid-column: 2;
  color: var(--teal-dark);
  font-size: 0.82rem;
  font-weight: 900;
}

.question-editor-form {
  display: grid;
  gap: 7px;
  position: static;
  align-self: stretch;
  max-height: none;
  overflow: visible;
  padding: 10px;
}

.question-editor-form[hidden] {
  display: none;
}

.question-list .question-editor-form {
  margin: 0 0 2px;
  border-color: rgba(8, 122, 120, 0.35);
  box-shadow: inset 3px 0 0 var(--teal);
}

.question-editor-head {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.question-editor-head h3 {
  margin: 0;
  font-size: 1rem;
}

.question-source {
  min-height: 22px;
  padding: 3px 7px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--teal-dark);
  font-size: 0.72rem;
  font-weight: 900;
}

.question-editor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 6px 8px;
}

.question-editor-fields {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px 8px;
}

.question-editor-form label {
  gap: 2px;
}

.question-editor-form label span {
  line-height: 1.1;
}

.question-editor-form input,
.question-editor-form select,
.question-editor-form textarea {
  min-height: 30px;
  font-size: 0.82rem;
}

.question-editor-form textarea {
  min-height: 54px;
  max-height: 96px;
  padding: 6px 8px;
}

.question-editor-form textarea[name="answer"] {
  min-height: 42px;
  max-height: 62px;
}

.question-field-wide {
  grid-column: 1 / -1;
}

@media (max-width: 1180px) {
  .question-editor-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.question-editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.question-editor-actions .button[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

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

.settings-section-list {
  max-height: min(46vh, 430px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.settings-table {
  min-width: 0;
}

.settings-table th:first-child,
.settings-table td:first-child {
  width: 74px;
}

.portal-settings-form {
  gap: 12px;
}

.portal-settings-grid {
  display: grid;
  grid-template-columns: minmax(180px, 0.6fr) minmax(260px, 1.4fr);
  gap: 8px;
}

.portal-design-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  gap: 8px;
}

.portal-design-box {
  display: grid;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.portal-design-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: end;
  justify-content: space-between;
}

.portal-design-heading h3 {
  margin: 0;
  color: var(--teal-dark);
  font-size: 1.02rem;
}

.portal-design-heading p {
  margin: 3px 0 0;
  color: var(--muted);
}

.portal-background-preview {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-width: 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.portal-background-preview img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
}

.portal-background-preview strong,
.portal-background-preview span {
  display: block;
}

.portal-background-preview span {
  overflow-wrap: anywhere;
  color: var(--muted);
}

.portal-settings-wide {
  grid-column: 1 / -1;
}

.portal-resources-wrap {
  max-height: min(52vh, 520px);
}

.portal-resources-table {
  min-width: 980px;
}

.portal-resources-table th:first-child,
.portal-resources-table td:first-child {
  width: 52px;
}

.portal-resources-table textarea {
  min-height: 48px;
  max-height: 86px;
  resize: vertical;
}

.portal-resources-table select,
.portal-resources-table input,
.portal-resources-table textarea {
  width: 100%;
}

.settings-grade-row td {
  padding: 7px 10px;
  background: var(--soft);
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.settings-table input {
  width: 100%;
  min-height: 34px;
  padding: 0 10px;
}

.settings-class-counts-wrap {
  max-height: min(28vh, 260px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.settings-class-counts-wrap thead {
  display: none;
}

.settings-class-counts-wrap .settings-table {
  display: block;
  width: 100%;
}

.settings-class-counts-wrap .settings-table td:first-child {
  width: auto;
}

.settings-class-counts-wrap tbody {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
  gap: 6px;
  padding: 8px;
}

.settings-class-counts-wrap tr {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 58px;
  gap: 6px;
  align-items: center;
  min-width: 0;
  padding: 5px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.settings-class-counts-wrap td {
  padding: 0;
  border: 0;
  color: var(--ink);
  font-weight: 900;
}

.settings-class-counts-wrap input {
  width: 58px;
  min-height: 28px;
  padding: 0 6px;
  text-align: center;
}

.settings-save-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
  justify-content: space-between;
}

.settings-question-count {
  width: min(220px, 100%);
}

.settings-question-count input {
  max-width: 120px;
}

.score-big {
  display: grid;
  place-items: center;
  min-height: 140px;
  margin-bottom: 12px;
}

.score-big strong {
  color: var(--teal-dark);
  font-size: 4rem;
  line-height: 1;
}

.score-big span {
  color: var(--muted);
  font-weight: 800;
}

.quiz-side-caption {
  margin: -4px 0 10px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.35;
}

.progress {
  height: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
}

.progress i {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--green), var(--amber));
}

.finish-box {
  display: grid;
  align-content: center;
  min-height: 100%;
}

@media (max-width: 960px) {
  html,
  body {
    height: auto;
    overflow: auto;
  }

  .app-shell {
    min-height: 100vh;
    height: auto;
    grid-template-rows: auto 1fr;
  }

  .topbar,
  .card-heading,
  .topic-nav {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar-actions,
  .header-topic-nav {
    justify-content: flex-start;
  }

  .main-nav {
    justify-content: flex-start;
  }

  .topic-nav-links {
    justify-content: flex-start;
  }

  .home-screen,
  .page-grid {
    height: auto;
  }

  .home-screen,
  .page-grid,
  .hero-card,
  .theory-layout,
  .vpr-layout,
  .truth-form,
  .page-grid-auth,
  .page-grid-admin,
  .admin-layout,
  .admin-two-column,
  .question-manager,
  .question-toolbar,
  .question-import-form,
  .question-editor-grid,
  .portal-settings-grid,
  .portal-design-grid,
  .portal-background-preview,
  .class-create-panel,
  .admin-account-grid,
  .practice-settings-grid,
  .practice-submit-panel,
  .practice-grade-form,
  .material-editor-layout,
  .converter-form,
  .answer-form {
    grid-template-columns: 1fr;
  }

  .home-screen {
    grid-template-rows: auto auto;
  }

  .hero-card {
    grid-template-columns: 1fr;
  }

  .hero-card img {
    max-height: 260px;
  }

  .module-grid,
  .fact-grid,
  .compact-grid,
  .gate-visual-grid,
  .logic-device-grid,
  .topic-widget-grid,
  .portal-card-grid,
  .option-grid {
    grid-template-columns: 1fr;
  }

  .dashboard-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .portal-header {
    align-items: stretch;
    flex-direction: column;
  }

  .question-editor-form {
    position: static;
    max-height: none;
    overflow: visible;
  }

  body.login-page {
    background-position: center, 34% center;
  }

  body.login-page .login-screen {
    padding: 16px;
    place-items: center;
  }

  body.login-page .login-panel {
    width: min(440px, 100%);
    transform: none;
  }

  .topic-widget {
    grid-template-rows: minmax(0, 190px) auto;
  }

  .vpr-layout .trainer-box {
    grid-column: auto;
  }

  .page-grid-vpr .vpr-layout > .vpr-choice-column,
  .page-grid-vpr .vpr-layout > .vpr-example-card,
  .page-grid-vpr .vpr-layout > .vpr-illustration {
    grid-column: auto;
    grid-row: auto;
  }

  .vpr-practice-choices {
    gap: 6px 10px;
  }

  .page-grid-vpr .answer-form {
    grid-template-columns: 1fr;
  }

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

  .access-toolbar,
  .access-class-head,
  .panel-heading,
  .practice-assignment-head,
  .result-filter,
  .settings-form,
  .class-create-form,
  .student-add-form,
  .student-import-form {
    align-items: stretch;
    flex-direction: column;
    grid-template-columns: 1fr;
  }

  .access-card-actions {
    justify-content: flex-start;
  }

  .practice-stat-row,
  .practice-delete-form {
    justify-self: stretch;
    justify-content: flex-start;
  }

  .scroll-return {
    right: 14px;
    bottom: 14px;
    width: 42px;
    height: 42px;
  }

  .side-panel,
  .content-card {
    overflow: visible;
  }
}