#nomkamo-student-class {
    --nsc-bg: #ffffff;
    --nsc-text: #050505;
    --nsc-muted: #707070;
    --nsc-line: #050505;
    --nsc-soft-line: rgba(5, 5, 5, 0.16);
    --nsc-blue: #d9efff;
    --nsc-soft-blue: #eef8ff;
    --nsc-green: #dff7e7;
    --nsc-yellow: #fff2bf;
    --nsc-red: #ffe1e1;
    width: 100%;
    min-height: 100vh;
    background: var(--nsc-bg);
    color: var(--nsc-text);
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
  }

  #nomkamo-student-class *,
  #nomkamo-student-class *::before,
  #nomkamo-student-class *::after {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
  }

  .nsc-wrap {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 28px 18px 64px;
  }

  .nsc-login {
    width: 100%;
    max-width: none;
    margin: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.42fr);
    gap: 20px;
  }

  .nsc-login-hero {
    min-height: 420px;
    border: 1px solid var(--nsc-soft-line);
    padding: 34px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    background: #ffffff;
  }

  .nsc-label {
    display: inline-flex;
    width: fit-content;
    border: 1px solid var(--nsc-line);
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 12px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: #ffffff;
  }

  .nsc-login-title {
    margin: 0;
    font-size: clamp(56px, 9vw, 112px);
    line-height: 0.86;
    letter-spacing: -0.08em;
    font-weight: 700;
  }

  .nsc-login-subtitle {
    margin: 18px 0 0;
    max-width: 620px;
    color: var(--nsc-muted);
    font-size: 16px;
    line-height: 1.45;
  }

  .nsc-login-card {
    border: 1px solid var(--nsc-soft-line);
    padding: 24px;
    background: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 18px;
  }

  .nsc-login-help {
    margin-top: 14px;
    border-top: 1px solid var(--nsc-soft-line);
    padding-top: 14px;
    color: var(--nsc-muted);
    font-size: 13px;
    line-height: 1.45;
  }

  .nsc-login-help-panel {
    margin-top: 12px;
    border: 1px solid var(--nsc-soft-line);
    padding: 14px;
    background: #ffffff;
    display: grid;
    gap: 10px;
  }

  .nsc-login-help-title {
    color: var(--nsc-text);
    font-size: 14px;
    line-height: 1.25;
    font-weight: 700;
  }

  .nsc-login-help-text {
    color: var(--nsc-muted);
    font-size: 13px;
    line-height: 1.45;
  }

  .nsc-field {
    width: 100%;
  }

  .nsc-field label {
    display: block;
    margin-bottom: 8px;
    font-size: 12px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--nsc-muted);
  }

  .nsc-input,
  .nsc-textarea {
    width: 100%;
    border: 1px solid var(--nsc-line);
    border-radius: 0;
    background: #ffffff;
    color: var(--nsc-text);
    padding: 13px 14px;
    font-size: 15px;
    line-height: 1.35;
    outline: none;
    appearance: none;
  }

  .nsc-textarea {
    min-height: 140px;
    resize: vertical;
  }

  .nsc-input:focus,
  .nsc-textarea:focus {
    background: var(--nsc-soft-blue);
  }

  .nsc-btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
  }

  .nsc-btn {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    color: var(--nsc-text);
    padding: 11px 14px;
    font-size: 13px;
    line-height: 1;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
    min-height: 38px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
  }

  .nsc-btn:hover {
    background: var(--nsc-blue);
    transform: translateY(-1px);
  }

  .nsc-btn:disabled {
    cursor: not-allowed;
    opacity: 0.45;
    transform: none;
  }

  .nsc-btn-primary {
    background: var(--nsc-text);
    color: #ffffff;
  }

  .nsc-btn-primary,
  .nsc-btn-primary:visited,
  .nsc-btn-primary:hover {
    color: #ffffff;
  }

  .nsc-locked-actions .nsc-btn-primary,
  .nsc-locked-actions .nsc-btn-primary:link,
  .nsc-locked-actions .nsc-btn-primary:visited,
  .nsc-locked-actions .nsc-btn-primary:hover,
  .nsc-locked-actions .nsc-btn-primary:active {
    color: #ffffff !important;
  }

  .nsc-btn-primary:hover {
    background: #333333;
  }

  .nsc-btn-soft {
    background: var(--nsc-soft-blue);
  }

  .nsc-btn-green {
    background: var(--nsc-green);
  }

  .nsc-btn-yellow {
    background: var(--nsc-yellow);
  }

  .nsc-status-line {
    min-height: 20px;
    margin-top: 12px;
    font-size: 14px;
    line-height: 1.4;
    color: var(--nsc-muted);
  }

  .nsc-status-line.is-error {
    color: #b00020;
  }

  .nsc-status-line.is-ok {
    color: #007a3d;
  }

  .nsc-loader {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 1px solid var(--nsc-line);
    border-top-color: transparent;
    border-radius: 50%;
    animation: nsc-spin 0.8s linear infinite;
    vertical-align: middle;
    margin-right: 8px;
  }

  @keyframes nsc-spin {
    to {
      transform: rotate(360deg);
    }
  }

  .nsc-class {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 16px;
  }

  .nsc-sidebar,
  .nsc-content {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-sidebar {
    align-self: start;
    position: sticky;
    top: 45px;
    max-height: calc(100vh - 90px);
    overflow: auto;
  }

  .nsc-sidebar-head {
    padding: 16px;
    border-bottom: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-course-title {
    margin: 14px 0 0;
    font-size: 26px;
    line-height: 0.95;
    letter-spacing: -0.06em;
    font-weight: 700;
  }

  .nsc-student {
    margin-top: 10px;
    color: var(--nsc-muted);
    font-size: 13px;
    line-height: 1.4;
  }

  .nsc-progress-card {
    padding: 14px;
    border-bottom: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-progress-top {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
  }

  .nsc-progress-title {
    font-size: 12px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--nsc-muted);
  }

  .nsc-progress-value {
    font-size: 28px;
    line-height: 0.9;
    letter-spacing: -0.06em;
    font-weight: 700;
  }

  .nsc-progress-bar {
    width: 100%;
    height: 10px;
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    margin-top: 12px;
    overflow: hidden;
  }

  .nsc-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--nsc-blue), var(--nsc-green));
    transition: width 0.25s ease;
  }

  .nsc-progress-meta {
    margin-top: 8px;
    color: var(--nsc-muted);
    font-size: 12px;
    line-height: 1.35;
  }

  .nsc-sidebar-actions {
    margin-top: 12px;
    padding: 0;
    border-bottom: 0;
  }

  .nsc-sidebar-actions .nsc-btn-row {
    gap: 6px;
  }

  .nsc-sidebar-actions .nsc-btn {
    min-height: 28px;
    padding: 7px 10px;
    font-size: 12px;
    width: auto;
  }

  .nsc-module {
    border-bottom: 1px solid var(--nsc-line);
  }

  .nsc-module-head {
    width: 100%;
    border: 0;
    background: #ffffff;
    color: var(--nsc-text);
    padding: 10px 14px;
    cursor: pointer;
    text-align: left;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: center;
  }

  .nsc-module-head:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-module-title {
    font-size: 12px;
    line-height: 1.15;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .nsc-module-meta {
    margin-top: 4px;
    color: var(--nsc-muted);
    font-size: 11px;
    line-height: 1.3;
  }

  .nsc-module-progress {
    width: 100%;
    height: 5px;
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    margin-top: 7px;
    overflow: hidden;
  }

  .nsc-module-progress-fill {
    height: 100%;
    background: var(--nsc-blue);
    transition: width 0.25s ease;
  }

  .nsc-module-arrow {
    font-size: 15px;
    line-height: 1;
  }

  .nsc-lessons {
    border-top: 1px solid var(--nsc-soft-line);
  }

  .nsc-lesson-btn {
    width: 100%;
    border: 0;
    border-bottom: 1px solid var(--nsc-soft-line);
    background: #ffffff;
    color: var(--nsc-text);
    padding: 9px 14px;
    text-align: left;
    cursor: pointer;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    align-items: center;
  }

  .nsc-lesson-btn:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-lesson-btn.is-active {
    background: var(--nsc-blue);
  }

  .nsc-lesson-btn.is-locked {
    color: var(--nsc-muted);
  }

  .nsc-lesson-btn.is-locked.is-active {
    background: var(--nsc-yellow);
    color: var(--nsc-text);
  }

  .nsc-lesson-title {
    font-size: 13px;
    line-height: 1.2;
    font-weight: 700;
  }

  .nsc-lesson-meta {
    margin-top: 3px;
    color: var(--nsc-muted);
    font-size: 11px;
    line-height: 1.3;
  }

  .nsc-check {
    border: 1px solid var(--nsc-line);
    border-radius: 999px;
    min-width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    background: #ffffff;
  }

  .nsc-check.is-done {
    background: var(--nsc-green);
  }

  .nsc-check.is-locked {
    background: var(--nsc-yellow);
  }

  .nsc-content-head {
    border-bottom: 1px solid var(--nsc-line);
    padding: 22px 26px 24px;
    background: #ffffff;
  }

  .nsc-head-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 18px;
  }

  .nsc-content-head.is-locked {
    background: linear-gradient(135deg, #ffffff 0%, #ffffff 54%, var(--nsc-yellow) 100%);
  }

  .nsc-breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 0;
  }

  .nsc-pill {
    display: inline-flex;
    width: fit-content;
    border: 1px solid var(--nsc-line);
    border-radius: 999px;
    padding: 6px 9px;
    font-size: 11px;
    line-height: 1;
    background: #ffffff;
  }

  .nsc-pill-blue {
    background: var(--nsc-blue);
  }

  .nsc-pill-green {
    background: var(--nsc-green);
  }

  .nsc-pill-yellow {
    background: var(--nsc-yellow);
  }

  .nsc-pill-red {
    background: var(--nsc-red);
  }

  .nsc-lesson-big-title {
    margin: 0;
    font-size: clamp(34px, 4.7vw, 64px);
    line-height: 0.9;
    letter-spacing: -0.08em;
    font-weight: 700;
  }

  .nsc-lesson-subtitle {
    margin: 12px 0 0;
    color: var(--nsc-muted);
    font-size: 15px;
    line-height: 1.35;
  }

  .nsc-content-actions {
    margin-top: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
    white-space: nowrap;
  }

  .nsc-complete-pill {
    border-radius: 999px;
    padding: 6px 9px;
    min-height: auto;
    font-size: 11px;
    line-height: 1;
    letter-spacing: 0;
  }

  .nsc-video-wrap {
    padding: 22px;
    border-bottom: 1px solid var(--nsc-line);
  }

  .nsc-video {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 1px solid var(--nsc-line);
    background: #000000;
    overflow: hidden;
  }

  .nsc-video iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
  }

  .nsc-no-video {
    border: 1px solid var(--nsc-line);
    padding: 22px;
    background: #ffffff;
    color: var(--nsc-muted);
    font-size: 15px;
    line-height: 1.45;
  }

  .nsc-locked-wrap {
    padding: 22px;
    border-bottom: 1px solid var(--nsc-line);
  }

  .nsc-locked-box {
    border: 1px solid var(--nsc-line);
    background: radial-gradient(circle at 10% 10%, var(--nsc-yellow), transparent 30%), linear-gradient(135deg, #ffffff 0%, #ffffff 64%, var(--nsc-soft-blue) 100%);
    padding: 22px;
    display: grid;
    gap: 18px;
  }

  .nsc-locked-icon {
    width: 52px;
    height: 52px;
    border: 1px solid var(--nsc-line);
    border-radius: 999px;
    background: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    line-height: 1;
  }

  .nsc-locked-title {
    margin: 0;
    font-size: clamp(28px, 4vw, 48px);
    line-height: 0.92;
    letter-spacing: -0.07em;
    font-weight: 700;
  }

  .nsc-locked-text {
    max-width: 720px;
    color: var(--nsc-muted);
    font-size: 16px;
    line-height: 1.5;
  }

  .nsc-locked-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
  }

  .nsc-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    border-bottom: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-tab {
    border: 0;
    border-right: 1px solid var(--nsc-line);
    background: #ffffff;
    color: var(--nsc-text);
    padding: 12px 15px;
    cursor: pointer;
    font-size: 13px;
    line-height: 1;
  }

  .nsc-tab:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-tab.is-active {
    background: var(--nsc-blue);
  }

  .nsc-tab-panel {
    padding: 22px;
  }

  .nsc-section-title {
    margin: 0 0 18px;
    font-size: 22px;
    line-height: 1;
    letter-spacing: -0.05em;
    font-weight: 700;
  }

  .nsc-grid {
    display: grid;
    gap: 14px;
  }

  .nsc-card {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-card-body {
    padding: 16px;
    font-size: 15px;
    line-height: 1.5;
    white-space: pre-wrap;
  }

  .nsc-accordion-btn {
    width: 100%;
    border: 0;
    background: #ffffff;
    color: var(--nsc-text);
    padding: 16px;
    cursor: pointer;
    text-align: left;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
  }

  .nsc-accordion-btn:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-accordion-title {
    font-size: 16px;
    line-height: 1.25;
    font-weight: 700;
  }

  .nsc-accordion-body {
    padding: 0 16px 16px;
    color: var(--nsc-text);
    font-size: 15px;
    line-height: 1.5;
    white-space: pre-wrap;
  }

  .nsc-formula-table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--nsc-line);
  }

  .nsc-formula-table th,
  .nsc-formula-table td {
    border: 1px solid var(--nsc-line);
    padding: 10px;
    text-align: left;
    vertical-align: top;
    font-size: 14px;
    line-height: 1.35;
  }

  .nsc-formula-table th {
    background: var(--nsc-soft-blue);
    font-size: 11px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .nsc-homework {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-homework + .nsc-homework {
    margin-top: 16px;
  }

  .nsc-homework-head {
    padding: 16px;
    border-bottom: 1px solid var(--nsc-line);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    align-items: flex-start;
  }

  .nsc-homework-title {
    font-size: 16px;
    line-height: 1.2;
    font-weight: 700;
  }

  .nsc-homework-description {
    margin-top: 10px;
    color: var(--nsc-muted);
    font-size: 15px;
    line-height: 1.45;
    white-space: pre-wrap;
  }

  .nsc-homework-body {
    padding: 16px;
  }

  .nsc-formula-editor {
    display: grid;
    gap: 10px;
    margin-bottom: 12px;
  }

  .nsc-formula-row {
    display: grid;
    grid-template-columns: 1.4fr 0.6fr 0.6fr 1.2fr auto;
    gap: 8px;
    align-items: start;
  }

  .nsc-mini-btn {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    color: var(--nsc-text);
    height: 44px;
    min-width: 44px;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
  }

  .nsc-mini-btn:hover {
    background: var(--nsc-red);
  }

  .nsc-comment-box {
    margin-top: 14px;
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    padding: 14px;
    font-size: 15px;
    line-height: 1.45;
  }

  .nsc-empty {
    border: 1px solid var(--nsc-line);
    padding: 24px;
    color: var(--nsc-muted);
    font-size: 15px;
    line-height: 1.45;
    background: #ffffff;
  }

  .nsc-quiz {
    display: grid;
    gap: 16px;
  }

  .nsc-quiz-question {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-quiz-question-head {
    padding: 14px;
    border-bottom: 1px solid var(--nsc-line);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
    background: #ffffff;
  }

  .nsc-quiz-num {
    border: 1px solid var(--nsc-line);
    border-radius: 999px;
    width: 28px;
    height: 28px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    background: #ffffff;
    font-size: 12px;
    line-height: 1;
  }

  .nsc-quiz-title {
    font-size: 15px;
    line-height: 1.35;
    font-weight: 700;
  }

  .nsc-quiz-options {
    display: grid;
  }

  .nsc-quiz-option {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px;
    align-items: start;
    padding: 13px 14px;
    border-bottom: 1px solid var(--nsc-soft-line);
    cursor: pointer;
    font-size: 15px;
    line-height: 1.35;
  }

  .nsc-quiz-option:last-child {
    border-bottom: 0;
  }

  .nsc-quiz-option:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-quiz-meta {
    margin-bottom: 14px;
    border: 1px solid var(--nsc-line);
    padding: 14px;
    background: #ffffff;
    font-size: 15px;
    line-height: 1.45;
  }

  .nsc-quiz-result {
    margin-bottom: 18px;
    border: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-quiz-result-head {
    padding: 16px;
    border-bottom: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-quiz-result-title {
    font-size: 18px;
    line-height: 1;
    font-weight: 700;
    letter-spacing: -0.04em;
  }

  .nsc-quiz-result-meta {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nsc-quiz-result-list {
    display: grid;
  }

  .nsc-quiz-result-item {
    padding: 14px 16px;
    border-bottom: 1px solid var(--nsc-soft-line);
  }

  .nsc-quiz-result-item:last-child {
    border-bottom: 0;
  }

  .nsc-quiz-result-question {
    font-size: 15px;
    line-height: 1.35;
    font-weight: 700;
    margin-bottom: 8px;
  }

  .nsc-quiz-result-answer {
    font-size: 14px;
    line-height: 1.45;
    color: var(--nsc-muted);
  }

  .nsc-quiz-result-answer strong {
    color: var(--nsc-text);
  }

  .nsc-quiz-result-ok {
    background: var(--nsc-green);
  }

  .nsc-quiz-result-bad {
    background: var(--nsc-red);
  }

  .nsc-image-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 16px;
  }

  .nsc-image-choice {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    cursor: pointer;
    display: block;
    position: relative;
  }

  .nsc-image-choice input {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 2;
  }

  .nsc-image-choice img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    display: block;
    border-bottom: 1px solid var(--nsc-line);
  }

  .nsc-image-choice-label {
    padding: 10px;
    font-size: 12px;
    line-height: 1;
    text-align: center;
  }

  .nsc-image-choice.is-selected {
    background: var(--nsc-blue);
  }

  .nsc-message-form {
    border: 1px solid var(--nsc-line);
    background: var(--nsc-soft-blue);
    padding: 16px;
    margin-bottom: 18px;
  }

  .nsc-message-list {
    display: grid;
    gap: 12px;
  }

  .nsc-message-card {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
  }

  .nsc-message-head {
    padding: 14px;
    border-bottom: 1px solid var(--nsc-line);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px;
    align-items: flex-start;
    background: #ffffff;
  }

  .nsc-message-title {
    font-size: 15px;
    line-height: 1.25;
    font-weight: 700;
  }

  .nsc-message-date {
    margin-top: 5px;
    color: var(--nsc-muted);
    font-size: 12px;
    line-height: 1.3;
  }

  .nsc-message-body {
    padding: 14px;
    display: grid;
    gap: 12px;
    font-size: 15px;
    line-height: 1.45;
  }

  .nsc-message-block {
    border: 1px solid var(--nsc-soft-line);
    padding: 12px;
    white-space: pre-wrap;
  }

  .nsc-message-block.is-reply {
    background: var(--nsc-green);
  }

  .nsc-message-block-label {
    margin-bottom: 7px;
    color: var(--nsc-muted);
    font-size: 11px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .nsc-sidebar-quick {
    border-top: 1px solid var(--nsc-soft-line);
    padding: 0;
    background: #ffffff;
  }

  .nsc-sidebar-quick-btn {
    width: 100%;
    border: 0;
    background: #ffffff;
    color: var(--nsc-text);
    padding: 13px 20px;
    min-height: 42px;
    cursor: pointer;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    align-items: center;
    text-align: left;
  }

  .nsc-sidebar-quick-btn:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-sidebar-quick-btn.is-active {
    background: var(--nsc-blue);
  }

  .nsc-sidebar-quick-title {
    font-size: 12px;
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nsc-sidebar-quick-meta {
    color: var(--nsc-muted);
    font-size: 12px;
    line-height: 1;
    white-space: nowrap;
  }

  .nsc-library-toolbar {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    align-items: end;
    margin-bottom: 18px;
  }

  .nsc-library-tabs {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
    border: 1px solid var(--nsc-line);
    margin-bottom: 18px;
    background: #ffffff;
    overflow: hidden;
  }

  .nsc-library-tab {
    border: 0;
    border-right: 1px solid var(--nsc-line);
    background: #ffffff;
    color: var(--nsc-text);
    padding: 13px 15px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
  }

  .nsc-library-tab:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-library-tab.is-active {
    background: var(--nsc-blue);
  }

  .nsc-library-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .nsc-library-item {
    border: 1px solid var(--nsc-line);
    background: #ffffff;
    display: grid;
    gap: 0;
  }

  .nsc-library-item-head {
    width: 100%;
    border: 0;
    border-bottom: 0;
    padding: 14px;
    background: #ffffff;
    color: var(--nsc-text);
    display: grid;
    gap: 10px;
    text-align: left;
    cursor: pointer;
  }

  .nsc-library-item-head:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-library-item.is-open .nsc-library-item-head {
    border-bottom: 1px solid var(--nsc-line);
  }

  .nsc-library-item-title-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 10px;
    align-items: center;
  }

  .nsc-library-item-title {
    font-size: 17px;
    line-height: 1.18;
    font-weight: 700;
    letter-spacing: -0.03em;
    min-width: 0;
  }

  .nsc-library-item-badges {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 6px;
    align-items: center;
  }

  .nsc-library-item-badges .nsc-pill {
    font-size: 10px;
    padding: 5px 7px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .nsc-library-item-arrow {
    border: 1px solid var(--nsc-line);
    border-radius: 999px;
    width: 26px;
    height: 26px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    background: #ffffff;
    font-size: 16px;
    line-height: 1;
  }

  .nsc-library-item-body {
    padding: 14px;
    display: grid;
    gap: 12px;
    font-size: 15px;
    line-height: 1.45;
  }

  .nsc-library-description {
    white-space: pre-wrap;
  }

  .nsc-library-lessons {
    color: var(--nsc-muted);
    font-size: 13px;
    line-height: 1.35;
  }

  .nsc-library-link {
    color: var(--nsc-text);
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  .nsc-module {
    border-bottom: 0;
  }

  .nsc-module + .nsc-module {
    border-top: 1px solid var(--nsc-line);
  }

  .nsc-lessons {
    border-top: 1px solid var(--nsc-soft-line);
  }

  .nsc-lesson-btn:last-child {
    border-bottom: 0;
  }

  .nsc-tabs {
    border-bottom: 1px solid var(--nsc-line);
  }

  .nsc-tab:last-child {
    border-right: 0;
  }

  .nsc-library-tabs button:last-child {
    border-right: 0;
  }

  /* Более лёгкий визуал: меньше тяжёлых внутренних обводок */
  .nsc-card,
  .nsc-homework,
  .nsc-quiz-question,
  .nsc-quiz-result,
  .nsc-message-card,
  .nsc-library-item,
  .nsc-empty,
  .nsc-comment-box,
  .nsc-no-video {
    border-color: var(--nsc-soft-line);
  }

  .nsc-card-body,
  .nsc-homework-head,
  .nsc-message-head,
  .nsc-message-body,
  .nsc-quiz-question-head,
  .nsc-quiz-result-head,
  .nsc-library-item.is-open .nsc-library-item-head,
  .nsc-content-head,
  .nsc-video-wrap,
  .nsc-tabs,
  .nsc-tab,
  .nsc-library-tabs,
  .nsc-library-tab,
  .nsc-lesson-btn,
  .nsc-lessons {
    border-color: var(--nsc-soft-line);
  }

  .nsc-pill,
  .nsc-check,
  .nsc-library-item-arrow,
  .nsc-quiz-num,
  .nsc-input,
  .nsc-textarea,
  .nsc-btn {
    border-color: var(--nsc-soft-line);
  }

  .nsc-card,
  .nsc-homework,
  .nsc-quiz-question,
  .nsc-message-card,
  .nsc-library-item {
    box-shadow: none;
  }

  .nsc-library-item-head {
    padding: 13px 14px;
  }

  .nsc-library-grid {
    gap: 10px;
  }

  .nsc-grid {
    gap: 10px;
  }

  .nsc-material-text,
  .nsc-library-description {
    white-space: pre-wrap;
  }

  .nsc-material-text a,
  .nsc-library-description a {
    color: var(--nsc-text);
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  .nsc-access-line {
    margin-top: 10px;
    color: var(--nsc-muted);
    font-size: 12px;
    line-height: 1.35;
  }

  .nsc-progress-actions {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nsc-progress-actions .nsc-btn {
    min-height: 28px;
    padding: 7px 10px;
    font-size: 12px;
  }

  .nsc-material-item {
    border: 1px solid var(--nsc-soft-line);
    background: #ffffff;
  }

  .nsc-material-head {
    width: 100%;
    border: 0;
    background: #ffffff;
    color: var(--nsc-text);
    padding: 14px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 10px;
    align-items: center;
    text-align: left;
    cursor: pointer;
  }

  .nsc-material-head:hover {
    background: var(--nsc-soft-blue);
  }

  .nsc-material-item.is-open .nsc-material-head {
    border-bottom: 1px solid var(--nsc-soft-line);
  }

  .nsc-material-title {
    min-width: 0;
    font-size: 16px;
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.03em;
  }

  .nsc-material-type {
    font-size: 10px;
    padding: 5px 7px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .nsc-material-arrow {
    border: 1px solid var(--nsc-soft-line);
    border-radius: 999px;
    width: 26px;
    height: 26px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    background: #ffffff;
    font-size: 16px;
    line-height: 1;
  }

  .nsc-material-body {
    padding: 14px;
  }

  .nsc-hub-list,
  .nsc-search-results {
    display: grid;
    gap: 14px;
  }

  .nsc-hub-context,
  .nsc-search-context {
    margin-bottom: 10px;
    color: var(--nsc-muted);
    font-size: 13px;
    line-height: 1.35;
  }

  .nsc-search-toolbar {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
    margin-bottom: 18px;
  }

  .nsc-search-card {
    border: 1px solid var(--nsc-soft-line);
    padding: 14px;
    background: #ffffff;
    display: grid;
    gap: 8px;
  }

  .nsc-search-title {
    font-size: 17px;
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.03em;
  }

  .nsc-search-snippet {
    color: var(--nsc-muted);
    font-size: 14px;
    line-height: 1.45;
    white-space: pre-wrap;
  }

  .nsc-search-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  
.nsc-login-help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.nsc-event-grid {
  display: grid;
  gap: 12px;
}

.nsc-event-card {
  border: 1px solid var(--nsc-soft-line);
  background: #ffffff;
  padding: 16px;
  display: grid;
  gap: 12px;
}

.nsc-event-top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  align-items: flex-start;
}

.nsc-event-title {
  font-size: 19px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.nsc-event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.nsc-event-description {
  color: var(--nsc-muted);
  font-size: 15px;
  line-height: 1.45;
  white-space: pre-wrap;
}

.nsc-event-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.nsc-register-note {
  margin-top: 12px;
  color: var(--nsc-muted);
  font-size: 13px;
  line-height: 1.45;
}

@media (max-width: 1040px) {
    .nsc-class,
    .nsc-login {
      grid-template-columns: 1fr;
    }

    .nsc-sidebar {
      position: relative;
      top: auto;
      max-height: none;
    }

    .nsc-library-item-title-row {
      grid-template-columns: minmax(0, 1fr) auto;
    }

    .nsc-library-item-badges {
      grid-column: 1 / -1;
      justify-content: flex-start;
      order: 3;
    }

    .nsc-image-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }
  }

  @media (max-width: 680px) {
    .nsc-wrap {
      padding: 18px 10px 48px;
    }

    .nsc-login-hero,
    .nsc-login-card,
    .nsc-sidebar-head,
    .nsc-content-head,
    .nsc-video-wrap,
    .nsc-tab-panel,
    .nsc-locked-wrap {
      padding: 18px;
    }

    .nsc-login-title {
      font-size: 36px;
    }

    .nsc-lesson-big-title {
      font-size: 34px;
    }

    .nsc-locked-title {
      font-size: 34px;
    }

    .nsc-tab {
      flex: 1 1 50%;
      border-bottom: 1px solid var(--nsc-line);
    }

    .nsc-btn {
      width: 100%;
    }

    .nsc-complete-pill {
      width: fit-content;
    }

    .nsc-formula-row {
      grid-template-columns: 1fr;
      border: 1px solid var(--nsc-line);
      padding: 10px;
    }

    .nsc-mini-btn {
      width: 100%;
    }

    .nsc-formula-table {
      display: block;
      overflow-x: auto;
      white-space: nowrap;
    }

    .nsc-image-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .nsc-head-top {
      display: grid;
      grid-template-columns: 1fr;
    }

    .nsc-locked-actions {
      display: grid;
      grid-template-columns: 1fr;
    }

    .nsc-library-toolbar,
    .nsc-library-grid {
      grid-template-columns: 1fr;
    }

    .nsc-library-tab {
      flex: 1 1 50%;
    }
  }


/* v19: регистрация, компактный поиск, раскрываемые ДЗ */
.nsc-consent-line {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 9px;
  align-items: start;
  padding: 12px;
  border: 1px solid var(--nsc-soft-line);
  color: var(--nsc-muted);
  font-size: 12px;
  line-height: 1.4;
}

.nsc-consent-line input {
  margin-top: 2px;
}

.nsc-consent-line a {
  color: var(--nsc-text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.nsc-sidebar-search {
  border-top: 1px solid var(--nsc-soft-line);
  border-bottom: 1px solid var(--nsc-soft-line);
  padding: 12px 20px;
  background: #ffffff;
}

.nsc-sidebar-search.is-active {
  background: #ffffff;
}

.nsc-sidebar-search-label {
  display: block;
  margin-bottom: 7px;
  color: var(--nsc-muted);
  font-size: 10px;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nsc-sidebar-search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px;
  gap: 6px;
}

.nsc-sidebar-search-input {
  width: 100%;
  border: 1px solid var(--nsc-soft-line);
  background: #ffffff;
  color: var(--nsc-text);
  min-height: 34px;
  padding: 8px 10px;
  font-size: 13px;
  line-height: 1;
  outline: none;
}

.nsc-sidebar-search-input:focus {
  background: var(--nsc-soft-blue);
}

.nsc-sidebar-search-btn {
  border: 1px solid var(--nsc-soft-line);
  background: #ffffff;
  color: var(--nsc-text);
  min-height: 34px;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}

.nsc-sidebar-search-btn:hover {
  background: var(--nsc-soft-blue);
}

.nsc-homework.is-collapsible .nsc-homework-head {
  width: 100%;
  border: 0;
  background: #ffffff;
  color: var(--nsc-text);
  cursor: pointer;
  text-align: left;
}

.nsc-homework.is-collapsible .nsc-homework-head:hover {
  background: var(--nsc-soft-blue);
}

.nsc-homework.is-collapsible.is-open .nsc-homework-head {
  border-bottom: 1px solid var(--nsc-soft-line);
}

.nsc-homework-side {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.nsc-homework-arrow {
  border: 1px solid var(--nsc-soft-line);
  border-radius: 999px;
  width: 26px;
  height: 26px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  background: #ffffff;
  font-size: 16px;
  line-height: 1;
}

.nsc-homework-context {
  margin-bottom: 6px;
  color: var(--nsc-muted);
  font-size: 12px;
  line-height: 1.25;
}


/* v20: аккуратные ДЗ и жирные ссылки материалов */
.nsc-library-link,
.nsc-material-link {
  font-weight: 700;
}

.nsc-homework-description-open {
  margin: 0 0 14px;
  color: var(--nsc-muted);
  font-size: 15px;
  line-height: 1.45;
  white-space: pre-wrap;
}


/* v22: покупка закрытых уроков */
.nsc-locked-course-note {
  color: var(--nsc-muted);
  font-size: 12px;
  line-height: 1.35;
  margin-top: 8px;
}


/* v25: rich text in material descriptions */
.nsc-rich-text p {
  margin: 0 0 10px;
}

.nsc-rich-text p:last-child {
  margin-bottom: 0;
}

.nsc-rich-text ul,
.nsc-rich-text ol {
  margin: 8px 0 12px 22px;
  padding: 0;
}

.nsc-rich-text li {
  margin: 4px 0;
}

.nsc-rich-text strong {
  font-weight: 700;
}


/* v28: compact formula homework editor + badges/reviews */
.nsc-formula-row {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.6fr) minmax(0, 0.55fr) minmax(0, 1.1fr) 36px;
  gap: 8px;
  align-items: end;
  max-width: 100%;
}

.nsc-formula-row .nsc-field {
  min-width: 0;
}

.nsc-formula-row .nsc-input {
  min-height: 36px;
  padding: 8px 10px;
  width: 100%;
}

.nsc-formula-row label {
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.08em;
}

.nsc-formula-row .nsc-mini-btn {
  width: 36px;
  min-width: 36px;
  height: 36px;
  min-height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.nsc-lesson-badge {
  margin-left: 6px;
  vertical-align: middle;
  font-size: 10px;
}

@media (max-width: 900px) {
  .nsc-formula-row {
    grid-template-columns: 1fr 1fr;
  }

  .nsc-formula-row .nsc-mini-btn {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .nsc-formula-row {
    grid-template-columns: 1fr;
  }
}


/* v29: review toast */
.nsc-toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 99999;
  max-width: min(420px, calc(100vw - 36px));
  border: 1px solid var(--nsc-line);
  background: #ffffff;
  color: var(--nsc-text);
  padding: 14px 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  font-size: 14px;
  line-height: 1.35;
}

.nsc-toast.is-ok {
  background: var(--nsc-soft-blue);
}

.nsc-toast.is-error {
  color: #b00020;
}

.nsc-toast-title {
  font-weight: 700;
}