:root {
    --bg: #f6f7fb;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: #d9dee8;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --accent: #c2410c;
    --danger: #b91c1c;
    --code: #111827;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Noto Sans", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.55;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

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

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

textarea {
    min-height: 120px;
    resize: vertical;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
    padding: 0 32px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
}

.brand {
    font-weight: 800;
    font-size: 20px;
}

.brand-row {
    display: flex;
    align-items: center;
    gap: 20px;
    min-width: 0;
}

.partner-logo {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    max-height: 36px;
    overflow: hidden;
    padding-left: 18px;
    border-left: 1px solid var(--line);
}

.partner-logo img {
    display: block;
    width: auto;
    height: 36px;
    max-height: 36px;
    max-width: 160px;
    object-fit: contain;
    overflow: hidden;
}

.nav {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--muted);
}

.language-switch {
    display: inline-flex;
    overflow: hidden;
    border: 1px solid rgba(15, 118, 110, 0.22);
    border-radius: 8px;
    background: #ffffff;
}

.language-switch button {
    min-height: 34px;
    padding: 0 10px;
    border: 0;
    border-right: 1px solid rgba(15, 118, 110, 0.18);
    background: transparent;
    color: var(--primary-dark);
    cursor: pointer;
    font: inherit;
    font-size: 0.86rem;
    font-weight: 900;
}

.language-switch button:last-child {
    border-right: 0;
}

.language-switch button.active {
    background: var(--primary);
    color: #ffffff;
}

.lang-panel[data-lang="vi"] {
    display: none;
}

body[data-language="vi"] .lang-panel[data-lang="en"] {
    display: none;
}

body[data-language="vi"] .lang-panel[data-lang="vi"] {
    display: block;
}

.translation-status {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    margin: 0 0 18px;
    padding: 6px 12px;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background: #eef9f7;
    color: var(--primary-dark);
    font-size: 0.9rem;
    font-weight: 800;
}

.nav a:hover,
.link-button:hover {
    color: var(--text);
}

.nav form {
    margin: 0;
}

.link-button {
    border: 0;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border: 0;
    border-radius: 8px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    cursor: pointer;
}

.button:hover {
    background: var(--primary-dark);
}

.button.secondary {
    background: #e7f5f3;
    color: var(--primary-dark);
}

.button.small {
    min-height: 34px;
    padding: 0 12px;
}

.hero {
    min-height: 520px;
    display: flex;
    align-items: center;
    padding: 80px 32px;
    background: linear-gradient(120deg, #e7f5f3, #fff7ed 55%, #eef2ff);
}

.hero-content {
    max-width: 820px;
}

.hero h1 {
    margin: 0;
    max-width: 780px;
    font-size: clamp(42px, 7vw, 76px);
    line-height: 1;
}

.hero p {
    max-width: 640px;
    font-size: 19px;
    color: var(--muted);
}

.eyebrow {
    color: var(--accent);
    text-transform: uppercase;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.section {
    max-width: 1180px;
    margin: 0 auto;
    padding: 46px 24px;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 24px;
}

.section-heading h1,
.section-heading h2,
.course-header h1 {
    margin: 0;
}

.section-heading p,
.course-header p {
    color: var(--muted);
    margin: 8px 0 0;
}

.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.subject-card,
.panel,
.form-card,
.exercise {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
}

.subject-card {
    padding: 24px;
}

.subject-card h2,
.subject-card h3 {
    margin-top: 0;
}

.subject-card p {
    color: var(--muted);
}

.subject-blocks {
    display: grid;
    gap: 36px;
}

.subject-block {
    display: grid;
    gap: 16px;
}

.subject-block-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
}

.subject-block-heading h2 {
    margin: 0;
    color: #101828;
    font-size: 24px;
}

.subject-block-heading span {
    color: var(--muted);
    font-size: 14px;
    font-weight: 800;
}

.subject-card {
    display: flex;
    flex-direction: column;
    padding: 0;
}

.subject-card-body {
    display: grid;
    gap: 10px;
    padding: 18px 20px 20px;
}

.subject-card-body h3,
.subject-card-body p {
    margin: 0;
}

.subject-media,
.course-header-media {
    overflow: hidden;
    border-radius: 8px;
    background: #f8fafc;
}

.subject-media {
    height: 150px;
    border-bottom: 1px solid var(--line);
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.subject-media img,
.course-header-media img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #ffffff;
}

.subject-illustration {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 16px;
    align-items: center;
    width: 100%;
    height: 100%;
    min-height: 150px;
    padding: 22px;
    background: linear-gradient(135deg, #f8fafc 0%, #ecfdf5 100%);
    color: #102a43;
}

.subject-illustration i {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    border: 1px solid rgba(15, 118, 110, 0.22);
    border-radius: 8px;
    background: #ffffff;
    color: var(--primary-dark);
    font-size: 27px;
}

.subject-illustration div {
    display: grid;
    gap: 6px;
    min-width: 0;
}

.subject-illustration span {
    display: block;
    overflow: hidden;
    color: #243044;
    font-size: 13px;
    font-weight: 900;
    line-height: 1.25;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.subject-illustration-logic {
    background: linear-gradient(135deg, #eef2ff 0%, #ecfdf5 100%);
}

.subject-illustration-math {
    background: linear-gradient(135deg, #eff6ff 0%, #fff7ed 100%);
}

.subject-illustration-data,
.subject-illustration-database {
    background: linear-gradient(135deg, #f0fdfa 0%, #fefce8 100%);
}

.subject-illustration-business,
.subject-illustration-management,
.subject-illustration-market,
.subject-illustration-economics {
    background: linear-gradient(135deg, #f8fafc 0%, #fff7ed 100%);
}

.subject-illustration-media {
    background: linear-gradient(135deg, #fdf2f8 0%, #eff6ff 100%);
}

.course-header-copy {
    flex: 1 1 420px;
}

.course-header-media {
    flex: 0 1 360px;
    min-height: 200px;
    border: 1px solid var(--line);
}

.course-header-media .subject-illustration {
    min-height: 200px;
}

.empty-state {
    margin: 0;
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    color: var(--muted);
    font-weight: 800;
}

.card-link {
    color: var(--primary-dark);
    font-weight: 800;
}

.auth-shell {
    display: grid;
    place-items: center;
    min-height: calc(100vh - 64px);
    padding: 32px 20px;
}

.form-card,
.form-stack {
    display: grid;
    gap: 14px;
}

.form-card {
    width: min(440px, 100%);
    padding: 28px;
}

.form-card h1 {
    margin: 0;
}

label {
    display: grid;
    gap: 6px;
    color: var(--muted);
    font-weight: 700;
}

input,
textarea,
select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    color: var(--text);
    padding: 10px 12px;
}

.error {
    padding: 10px 12px;
    border-radius: 8px;
    background: #fee2e2;
    color: var(--danger);
}

.course-header {
    padding: 28px;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--line);
    margin-bottom: 24px;
}

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

.lesson-section {
    display: grid;
    gap: 10px;
}

.lesson-row {
    display: grid;
    gap: 4px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
}

.lesson-row span {
    font-weight: 800;
}

.lesson-row small {
    color: var(--muted);
}

.course-layout {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    min-height: calc(100vh - 64px);
}

.course-sidebar {
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    overflow: auto;
    padding: 22px;
    border-right: 1px solid var(--line);
    background: var(--surface);
}

.back-link {
    display: block;
    color: var(--primary-dark);
    font-weight: 800;
    margin-bottom: 20px;
}

.sidebar-block-title {
    margin: 18px 0 8px;
    color: #64748b;
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.back-link + .sidebar-block-title {
    margin-top: 0;
}

.subject-folder {
    margin-bottom: 14px;
}

.subject-folder summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f8fafc;
    cursor: pointer;
    font-weight: 900;
}

.subject-folder summary::after {
    content: "+";
    color: var(--muted);
    font-weight: 900;
}

.subject-folder[open] summary::after {
    content: "-";
}

.subject-folder summary::-webkit-details-marker {
    display: none;
}

.sidebar-section {
    display: grid;
    gap: 8px;
    margin: 12px 0 18px 10px;
}

.sidebar-section h3 {
    margin: 0 0 4px;
    font-size: 14px;
    color: var(--muted);
}

.sidebar-section a {
    padding: 9px 10px;
    border-radius: 8px;
}

.sidebar-section a.active,
.sidebar-section a:hover {
    background: #e7f5f3;
    color: var(--primary-dark);
}

.lesson-content {
    width: min(1120px, 100%);
    padding: 42px 34px 80px;
}

.lesson-content h1 {
    margin: 0;
    font-size: 44px;
    line-height: 1.1;
}

.summary {
    color: var(--muted);
    font-size: 18px;
}

.content-body {
    margin: 28px 0;
    font-size: 17px;
}

pre {
    overflow: auto;
    padding: 16px;
    border-radius: 8px;
    background: var(--code);
    color: #e5e7eb;
}

code {
    font-family: "Cascadia Code", Consolas, monospace;
}

.content-body .source-text {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    max-width: 100%;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    font-size: 16px;
    line-height: 1.7;
    box-shadow: none;
}

.widget-panel {
    margin: 30px 0;
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff7ed;
}

.widget-stage {
    min-height: 150px;
}

.widget-flow {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.widget-node {
    padding: 14px 16px;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid var(--line);
    font-weight: 800;
}

.practice {
    display: grid;
    gap: 18px;
    margin-top: 36px;
}

.exercise {
    padding: 20px;
}

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

.exercise-heading h3 {
    margin: 0;
}

.exercise-heading span {
    color: var(--muted);
    font-size: 13px;
}

.choice {
    grid-template-columns: 18px 1fr;
    align-items: center;
    padding: 8px 0;
    color: var(--text);
    font-weight: 500;
}

.choice input,
.inline-check input {
    width: auto;
}

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

.code-input {
    min-height: 190px;
    background: #0f172a;
    color: #e5e7eb;
    font-family: "Cascadia Code", Consolas, monospace;
}

.code-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.runner-state,
.exercise-result {
    color: var(--muted);
}

.guest-note {
    margin: 0;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #eef2ff;
    color: var(--muted);
}

.lesson-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 32px;
}

.lesson-nav a {
    color: var(--primary-dark);
    font-weight: 800;
}

.dashboard-grid,
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 18px;
    margin-bottom: 22px;
}

.panel {
    padding: 20px;
}

.panel h2 {
    margin-top: 0;
}

.data-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
}

.data-row:last-child {
    border-bottom: 0;
}

.danger {
    border: 0;
    color: var(--danger);
    background: transparent;
    cursor: pointer;
    font-weight: 800;
}

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

@media (max-width: 800px) {
    .topbar {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
        padding: 14px 18px;
    }

    .nav {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 4px;
    }

    .brand-row {
        width: 100%;
        justify-content: space-between;
        gap: 14px;
    }

    .partner-logo {
        padding-left: 12px;
    }

    .partner-logo img {
        height: 28px;
        max-width: 140px;
    }

    .course-layout {
        grid-template-columns: 1fr;
    }

    .course-sidebar {
        position: static;
        height: auto;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .lesson-content {
        padding: 28px 18px 60px;
    }

    .lesson-content h1 {
        font-size: 34px;
    }

    .section-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .subject-block-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
    }

    .course-header-media {
        flex-basis: 100%;
        min-height: 170px;
    }

    .subject-media {
        height: 136px;
    }
}

:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --surface-tint: #edf7f5;
    --text: #172033;
    --muted: #667085;
    --line: #d8e0eb;
    --primary: #0d8277;
    --primary-dark: #075e56;
    --accent: #b45309;
    --danger: #b42318;
    --code: #101828;
    --focus: rgba(13, 130, 119, 0.22);
    --shadow-sm: 0 8px 18px rgba(16, 24, 40, 0.06);
    --shadow-md: 0 18px 42px rgba(16, 24, 40, 0.1);
    --shadow-lg: 0 28px 70px rgba(16, 24, 40, 0.14);
}

html {
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(circle at top left, rgba(13, 130, 119, 0.09), transparent 30rem),
        radial-gradient(circle at top right, rgba(180, 83, 9, 0.07), transparent 28rem),
        var(--bg);
}

.topbar {
    min-height: 72px;
    padding: 0 clamp(18px, 4vw, 48px);
    border-bottom-color: rgba(216, 224, 235, 0.78);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8), 0 12px 32px rgba(16, 24, 40, 0.04);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 0;
}

.brand::before {
    content: "";
    width: 11px;
    height: 28px;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--primary), #14b8a6);
    box-shadow: 0 8px 16px rgba(13, 130, 119, 0.24);
}

.nav a,
.link-button {
    position: relative;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    border-radius: 8px;
    transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

.nav a:not(.button) {
    padding: 0 8px;
}

.nav a:not(.button):hover,
.link-button:hover {
    background: rgba(13, 130, 119, 0.08);
    color: var(--primary-dark);
    transform: translateY(-1px);
}

.button,
.danger,
.card-link,
.lesson-nav a {
    transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, color 160ms ease;
}

.button {
    box-shadow: 0 10px 22px rgba(13, 130, 119, 0.18);
}

.button:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 30px rgba(13, 130, 119, 0.22);
}

.button.secondary {
    box-shadow: none;
}

input,
textarea,
select {
    min-height: 44px;
    border-color: rgba(152, 162, 179, 0.42);
    box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
    transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

input:focus,
textarea:focus,
select:focus {
    outline: 0;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--focus);
}

.section {
    padding-top: clamp(36px, 5vw, 70px);
    padding-bottom: clamp(48px, 7vw, 88px);
}

.section-heading {
    padding-bottom: 8px;
}

.section-heading h1,
.section-heading h2,
.course-header h1,
.lesson-content h1 {
    letter-spacing: 0;
    color: #101828;
}

.section-heading h1 {
    font-size: clamp(36px, 5vw, 58px);
    line-height: 1.02;
}

.section-heading p {
    max-width: 620px;
    font-size: 17px;
}

.hero {
    position: relative;
    min-height: 560px;
    overflow: hidden;
    background:
        linear-gradient(120deg, rgba(237, 247, 245, 0.92), rgba(255, 255, 255, 0.84) 50%, rgba(255, 247, 237, 0.9)),
        var(--surface);
}

.hero::after {
    content: "";
    position: absolute;
    right: clamp(24px, 9vw, 120px);
    bottom: 56px;
    width: min(36vw, 420px);
    aspect-ratio: 1.35;
    border: 1px solid rgba(13, 130, 119, 0.14);
    border-radius: 8px;
    background:
        linear-gradient(90deg, rgba(13, 130, 119, 0.16) 1px, transparent 1px),
        linear-gradient(rgba(13, 130, 119, 0.12) 1px, transparent 1px),
        rgba(255, 255, 255, 0.72);
    background-size: 34px 34px;
    box-shadow: var(--shadow-lg);
    transform: rotate(-2deg);
}

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

.hero h1 {
    max-width: 760px;
    color: #101828;
}

.subject-grid {
    gap: 22px;
}

.subject-card,
.panel,
.form-card,
.exercise,
.course-header,
.lesson-row {
    border-color: rgba(152, 162, 179, 0.32);
    box-shadow: var(--shadow-sm);
}

.subject-card,
.lesson-row,
.panel,
.exercise {
    position: relative;
    overflow: hidden;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background 180ms ease;
}

.subject-card::before,
.lesson-row::before,
.exercise::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary), #14b8a6);
    opacity: 0;
    transition: opacity 180ms ease;
}

.subject-card:hover,
.lesson-row:hover,
.exercise:hover {
    transform: translateY(-3px);
    border-color: rgba(13, 130, 119, 0.35);
    box-shadow: var(--shadow-md);
}

.subject-card:hover::before,
.lesson-row:hover::before,
.exercise:hover::before {
    opacity: 1;
}

.subject-card h2,
.subject-card h3,
.panel h2,
.exercise-heading h3 {
    color: #101828;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.card-link::after {
    content: "->";
    transition: transform 160ms ease;
}

.card-link:hover::after {
    transform: translateX(4px);
}

.course-layout {
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.92) 0 320px, transparent 320px),
        var(--bg);
}

.course-sidebar {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
}

.subject-folder summary {
    min-height: 52px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.subject-folder[open] summary {
    border-color: rgba(13, 130, 119, 0.28);
    background: linear-gradient(180deg, #ffffff, #edf7f5);
    box-shadow: 0 10px 22px rgba(13, 130, 119, 0.08);
}

.sidebar-section a {
    transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.sidebar-section a:hover {
    transform: translateX(2px);
}

.sidebar-section a.active {
    box-shadow: inset 4px 0 0 var(--primary);
}

.lesson-content {
    animation: page-in 260ms ease both;
}

.content-body p {
    max-width: 850px;
}

pre {
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 16px 34px rgba(16, 24, 40, 0.14);
}

.content-body pre.source-text {
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    box-shadow: var(--shadow-sm);
}

.content-body pre.source-text-readable {
    width: 100%;
    margin: 0;
    padding: 28px 30px;
    border-color: rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.98)),
        var(--surface);
    color: #243044;
    font-size: 17px;
    line-height: 1.82;
    white-space: pre-wrap;
    overflow-x: hidden;
    overflow-wrap: break-word;
    box-shadow: 0 18px 38px rgba(15, 23, 42, 0.08);
}

.content-body pre.source-text-readable::first-line {
    color: var(--primary-dark);
    font-size: 21px;
    font-weight: 800;
}

.lesson-source {
    display: grid;
    gap: 18px;
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: #243044;
    box-shadow: none;
}

.lesson-source h2,
.lesson-source h3,
.lesson-source p {
    margin: 0;
}

.lesson-source h2 {
    max-width: 980px;
    padding: 18px 20px;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-left: 6px solid var(--primary);
    border-radius: 8px;
    background: linear-gradient(135deg, #f0fdfa 0%, #ffffff 72%);
    color: #0f3f3a;
    font-size: 24px;
    line-height: 1.25;
    box-shadow: 0 16px 30px rgba(15, 23, 42, 0.06);
}

.lesson-source h3 {
    max-width: 980px;
    margin-top: 12px;
    padding: 13px 0 8px 16px;
    border-left: 4px solid var(--accent);
    color: #111827;
    font-size: 20px;
    letter-spacing: 0;
    text-transform: none;
}

.lesson-source p,
.source-list,
.source-numbered-list,
.source-overview-list {
    max-width: 920px;
    font-size: 17px;
    line-height: 1.72;
}

.lesson-source p {
    padding: 0 0 0 20px;
    color: #2f3b4f;
}

.source-list {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0 0 0 20px;
    list-style: none;
}

.source-list li,
.source-numbered-list li,
.source-overview-list li {
    position: relative;
    padding: 10px 14px 10px 18px;
    border: 1px solid rgba(15, 118, 110, 0.14);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.04);
}

.source-list li::before {
    content: "";
    position: absolute;
    top: 1.25em;
    left: -2px;
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: var(--primary);
}

.source-numbered-list {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0 0 0 20px;
    list-style: decimal;
}

.source-numbered-list li {
    padding-left: 14px;
}

.source-overview-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 10px;
    margin: 0;
    padding: 0 0 0 20px;
    list-style: none;
}

.source-overview-list li {
    min-height: 72px;
    padding: 14px 16px;
    border-color: rgba(194, 65, 12, 0.16);
    background: #fff7ed;
    color: #7c2d12;
    font-weight: 700;
}

.source-definition-list {
    display: grid;
    grid-template-columns: minmax(180px, 0.38fr) minmax(0, 0.62fr);
    max-width: 980px;
    margin: 0;
    overflow: hidden;
    border: 1px solid rgba(15, 118, 110, 0.16);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.05);
}

.source-definition-list dt,
.source-definition-list dd {
    margin: 0;
    padding: 12px 14px;
    border-bottom: 1px solid var(--line);
}

.source-definition-list dt {
    background: #f0fdfa;
    color: #134e4a;
    font-weight: 800;
}

.source-definition-list dd {
    color: #334155;
}

.source-definition-list dt:nth-last-child(2),
.source-definition-list dd:last-child {
    border-bottom: 0;
}

.source-citation {
    max-width: 980px;
    padding: 10px 14px 10px 18px !important;
    border-left: 4px solid rgba(100, 116, 139, 0.42);
    border-radius: 6px;
    background: #f8fafc;
    color: #64748b !important;
    font-size: 14px !important;
    line-height: 1.55 !important;
}

.source-equation,
.source-example {
    max-width: 960px;
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 16px;
    line-height: 1.65;
}

.source-equation {
    border: 1px solid rgba(37, 99, 235, 0.16);
    background: #eff6ff;
    color: #1e3a8a;
    font-family: "Cascadia Code", Consolas, monospace;
}

.source-example {
    border-left: 4px solid var(--accent);
    background: #fff7ed;
    color: #7c2d12;
}

.source-math-example {
    max-width: 980px;
    color: #111827;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 17px;
    font-weight: 700;
    line-height: 1.45;
}

.content-body pre.source-math-block {
    width: 100%;
    max-width: 980px;
    margin: 0;
    padding: 22px 24px;
    overflow-x: auto;
    border: 1px solid rgba(17, 24, 39, 0.14);
    border-radius: 6px;
    background: #ffffff;
    color: #111827;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.06);
    font-family: "Cambria Math", Cambria, "Times New Roman", serif;
    font-size: 18px;
    line-height: 1.7;
    text-align: center;
    white-space: pre;
}

.lesson-content .content-body .mat-eq-block,
.lesson-content .content-body .formula-box {
    border: 1px solid rgba(17, 24, 39, 0.14) !important;
    border-radius: 6px !important;
    background: #ffffff !important;
    color: #111827 !important;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.06) !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
}

.lesson-content .content-body .math-frac {
    display: inline-grid !important;
    grid-template-rows: auto auto !important;
    place-items: center !important;
    vertical-align: middle !important;
    line-height: 1.05 !important;
    margin: 0 0.1em !important;
    color: inherit !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
}

.lesson-content .content-body .math-frac > span {
    display: block !important;
    padding: 0.05em 0.25em !important;
    white-space: nowrap !important;
}

.lesson-content .content-body .math-frac > span:first-child {
    width: 100% !important;
    border-bottom: 1.6px solid currentColor !important;
    text-align: center !important;
}

.lesson-content .content-body .math-frac > span:last-child {
    text-align: center !important;
}

.lesson-content .content-body .mat td .math-frac {
    font-size: 0.9em !important;
}

.lesson-content .content-body .math-radical {
    display: inline-flex !important;
    align-items: flex-start !important;
    vertical-align: middle !important;
    color: inherit !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    line-height: 1 !important;
    white-space: nowrap !important;
}

.lesson-content .content-body .math-radical::before {
    content: "√" !important;
    display: inline-block !important;
    font-size: 1.2em !important;
    line-height: 0.95 !important;
    transform: translateY(0.04em) !important;
}

.lesson-content .content-body .math-radical > span {
    display: inline-block !important;
    margin-left: -0.04em !important;
    padding: 0.08em 0.08em 0 !important;
    border-top: 1.6px solid currentColor !important;
    line-height: 1.05 !important;
}

.lesson-content .content-body .lesson-structured-block {
    display: grid !important;
    gap: 14px !important;
    width: 100% !important;
    max-width: 980px !important;
    margin: 18px 0 28px !important;
    padding: 18px !important;
    border: 1px solid rgba(15, 118, 110, 0.14) !important;
    border-radius: 8px !important;
    background: #ffffff !important;
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08) !important;
}

.lesson-content .content-body .lesson-structured-block h3 {
    margin: 0 !important;
    color: #111827 !important;
    font-size: 18px !important;
    line-height: 1.35 !important;
}

.lesson-content .content-body .lesson-structured-block .source-table-wrap {
    margin: 0 !important;
    max-width: 100% !important;
    box-shadow: none !important;
}

.lesson-content .content-body .lesson-structured-block .source-table {
    box-shadow: none !important;
}

.lesson-content .content-body .lesson-relation-row {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto !important;
    gap: 14px !important;
    align-items: center !important;
    padding: 14px 16px !important;
    border: 1px solid rgba(15, 118, 110, 0.14) !important;
    border-radius: 8px !important;
    background: #f8fafc !important;
    color: #111827 !important;
    font-family: "Cascadia Code", Consolas, monospace !important;
    font-weight: 800 !important;
}

.lesson-content .content-body .lesson-relation-row strong {
    color: #0f766e !important;
    font-size: 22px !important;
}

.lesson-content .content-body .lesson-relation-row em {
    padding: 5px 10px !important;
    border-radius: 999px !important;
    background: #ecfdf5 !important;
    color: #047857 !important;
    font-family: Inter, system-ui, sans-serif !important;
    font-size: 13px !important;
    font-style: normal !important;
    font-weight: 900 !important;
    white-space: nowrap !important;
}

.lesson-content .widget-panel {
    display: none !important;
}

.lesson-content .content-body .mat {
    display: inline-table !important;
    width: auto !important;
    max-width: 100% !important;
    table-layout: auto !important;
    border-collapse: separate !important;
    border-spacing: 14px 5px !important;
    border-left: 2px solid #111827 !important;
    border-right: 2px solid #111827 !important;
    border-radius: 0 !important;
    background: #ffffff !important;
    padding: 6px 10px !important;
    vertical-align: middle !important;
}

.lesson-content .content-body .mat tbody {
    display: table-row-group !important;
}

.lesson-content .content-body .mat tr {
    display: table-row !important;
}

.lesson-content .content-body .mat td {
    display: table-cell !important;
    min-width: 24px !important;
    padding: 2px 4px !important;
    color: #111827 !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    font-size: 18px !important;
    line-height: 1.35 !important;
    text-align: right !important;
    white-space: nowrap !important;
    vertical-align: middle !important;
}

.lesson-content .content-body .mat-eq-block {
    max-width: 100% !important;
    overflow-x: auto !important;
    align-items: center !important;
    justify-content: flex-start !important;
}

.lesson-content .content-body .mat-named {
    flex: 0 0 auto !important;
    align-items: center !important;
    text-align: center !important;
}

.lesson-content .content-body .mat-label,
.lesson-content .content-body .op,
.lesson-content .content-body .eq {
    color: #111827 !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
}

.lesson-content .content-body .ex-box {
    border: 1px solid rgba(15, 118, 110, 0.18) !important;
    border-radius: 8px !important;
    background: #ffffff !important;
    color: #111827 !important;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.06) !important;
}

.lesson-content .content-body .vector-example {
    display: grid !important;
    gap: 14px !important;
    max-width: 980px !important;
    padding: 18px !important;
}

.lesson-content .content-body .vector-example-title {
    display: grid !important;
    gap: 4px !important;
    color: #111827 !important;
    font-family: Georgia, "Times New Roman", serif !important;
}

.lesson-content .content-body .vector-example-title strong {
    color: #134e4a !important;
    font-size: 18px !important;
}

.lesson-content .content-body .vector-example-title span {
    color: #475569 !important;
    line-height: 1.5 !important;
}

.lesson-content .content-body .calculation-grid {
    display: grid !important;
    gap: 10px !important;
}

.lesson-content .content-body .calc-card {
    display: grid !important;
    grid-template-columns: minmax(150px, 0.32fr) minmax(0, 1fr) auto !important;
    gap: 12px !important;
    align-items: center !important;
    margin: 0 !important;
    padding: 12px 14px !important;
    border: 1px solid rgba(15, 118, 110, 0.14) !important;
    border-radius: 8px !important;
    background: #f8fafc !important;
    color: #111827 !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    font-size: 17px !important;
    line-height: 1.45 !important;
}

.lesson-content .content-body .calc-row {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 8px 16px !important;
    align-items: baseline !important;
    margin: 0 !important;
    padding: 10px 14px !important;
    border-top: 1px solid rgba(15, 118, 110, 0.12) !important;
    border-right: 0 !important;
    border-bottom: 0 !important;
    border-left: 0 !important;
    border-radius: 0 !important;
    background: transparent !important;
    color: #111827 !important;
    box-shadow: none !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    font-size: 17px !important;
    line-height: 1.5 !important;
}

.lesson-content .content-body .calc-row:first-of-type {
    border-top: 0 !important;
}

.lesson-content .content-body .calc-row > span:first-child {
    flex: 0 0 150px !important;
    color: #0f766e !important;
    font-weight: 800 !important;
}

.lesson-content .content-body .calc-row > strong:last-child {
    margin-left: auto !important;
    color: #047857 !important;
    white-space: nowrap !important;
}

.lesson-content .content-body .calc-label {
    color: #0f766e !important;
    font-weight: 800 !important;
}

.lesson-content .content-body .calc-equation {
    color: #111827 !important;
    overflow-wrap: anywhere !important;
}

.lesson-content .content-body .calc-result {
    padding: 5px 10px !important;
    border-radius: 999px !important;
    background: #dcfce7 !important;
    color: #166534 !important;
    font-weight: 900 !important;
    white-space: nowrap !important;
}

.lesson-content .content-body .component-formulas {
    display: grid !important;
    gap: 8px !important;
    max-width: 880px !important;
    margin: 10px 0 !important;
    padding: 14px !important;
    border: 1px solid rgba(37, 99, 235, 0.14) !important;
    border-radius: 8px !important;
    background: #eff6ff !important;
}

.lesson-content .content-body .component-formulas div {
    display: grid !important;
    grid-template-columns: 132px minmax(0, 1fr) !important;
    gap: 12px !important;
    align-items: baseline !important;
    color: #1e3a8a !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    font-size: 17px !important;
}

.lesson-content .content-body .component-formulas span {
    color: #1d4ed8 !important;
    font-weight: 900 !important;
}

.lesson-content .content-body .vec {
    color: #0f766e !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    font-weight: 900 !important;
}

.lesson-content .content-body .def-box,
.lesson-content .content-body .note-box,
.lesson-content .content-body .warn-box {
    border: 1px solid rgba(17, 24, 39, 0.14) !important;
    border-left: 4px solid #111827 !important;
    border-radius: 6px !important;
    background: #ffffff !important;
    color: #111827 !important;
    font-family: Georgia, "Times New Roman", serif !important;
}

.lesson-content .content-body .truth-table,
.lesson-content .content-body .step-table {
    width: 100% !important;
    max-width: 980px !important;
    overflow: hidden !important;
    border: 1px solid rgba(17, 24, 39, 0.14) !important;
    border-radius: 8px !important;
    border-collapse: separate !important;
    border-spacing: 0 !important;
    background: #ffffff !important;
    color: #111827 !important;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.06) !important;
}

.lesson-content .content-body .truth-table th,
.lesson-content .content-body .truth-table td,
.lesson-content .content-body .step-table th,
.lesson-content .content-body .step-table td {
    border-color: rgba(17, 24, 39, 0.14) !important;
    background: #ffffff !important;
    color: #111827 !important;
}

.lesson-content .content-body .truth-table th,
.lesson-content .content-body .step-table th {
    background: #ecfdf5 !important;
    color: #115e59 !important;
    font-weight: 900 !important;
}

.lesson-content .content-body .truth-table tr:nth-child(even) td,
.lesson-content .content-body .step-table tr:nth-child(even) td {
    background: #f8fafc !important;
}

.lesson-content .content-body .gate-card,
.lesson-content .content-body .law-block,
.lesson-content .content-body .step-block,
.lesson-content .content-body .ui-card,
.lesson-content .content-body .adder-block,
.lesson-content .content-body .component-block,
.lesson-content .content-body .bit-add-example,
.lesson-content .content-body .sign-grid,
.lesson-content .content-body .complex-plane {
    border: 1px solid rgba(17, 24, 39, 0.14) !important;
    border-radius: 8px !important;
    background: #ffffff !important;
    color: #111827 !important;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.06) !important;
}

.lesson-content .content-body .gate-card h4,
.lesson-content .content-body .law-block h4,
.lesson-content .content-body .step-block h4,
.lesson-content .content-body .ui-card h5,
.lesson-content .content-body .adder-block h3,
.lesson-content .content-body .component-block h3 {
    color: #115e59 !important;
}

.lesson-content .content-body .gate-card p,
.lesson-content .content-body .ui-card p,
.lesson-content .content-body .law-block p,
.lesson-content .content-body .adder-block p,
.lesson-content .content-body .component-block p,
.lesson-content .content-body ol,
.lesson-content .content-body ul {
    color: #243044 !important;
}

.lesson-content .content-body [style*="#7dd3fc"],
.lesson-content .content-body [style*="#38bdf8"],
.lesson-content .content-body [style*="#a78bfa"],
.lesson-content .content-body [style*="#f59e0b"] {
    color: #0f5f75 !important;
}

.lesson-content .content-body [style*="#22c55e"],
.lesson-content .content-body [style*="#86efac"],
.lesson-content .content-body .sign-plus {
    color: #047857 !important;
}

.lesson-content .content-body [style*="#ef4444"],
.lesson-content .content-body [style*="#f87171"],
.lesson-content .content-body .sign-minus {
    color: #b91c1c !important;
}

.lesson-content .content-body [style*="#94a3b8"],
.lesson-content .content-body [style*="#64748b"],
.lesson-content .content-body [style*="#e2e8f0"],
.lesson-content .content-body [style*="#f1f5f9"],
.lesson-content .content-body [style*="#bbf7d0"],
.lesson-content .content-body [style*="#fca5a5"],
.lesson-content .content-body [style*="#d4d4d4"],
.lesson-content .content-body [style*="#ccc"] {
    color: #111827 !important;
}

.lesson-content .mat-eq-block,
.lesson-content .formula-box,
.lesson-content .def-box,
.lesson-content .note-box,
.lesson-content .warn-box,
.lesson-content .truth-table,
.lesson-content .step-table,
.lesson-content .gate-card,
.lesson-content .law-block,
.lesson-content .step-block,
.lesson-content .ui-card,
.lesson-content .adder-block,
.lesson-content .component-block,
.lesson-content .bit-add-example,
.lesson-content .sign-grid,
.lesson-content .complex-plane {
    border-color: rgba(17, 24, 39, 0.14) !important;
    background: #ffffff !important;
    color: #111827 !important;
}

.lesson-content .mat {
    display: inline-table !important;
    width: auto !important;
    max-width: 100% !important;
    table-layout: auto !important;
    border-collapse: separate !important;
    border-spacing: 14px 5px !important;
    border-left: 2px solid #111827 !important;
    border-right: 2px solid #111827 !important;
    background: #ffffff !important;
}

.lesson-content .mat td {
    display: table-cell !important;
    min-width: 24px !important;
    padding: 2px 4px !important;
    color: #111827 !important;
    font-family: "Cambria Math", Cambria, "Times New Roman", serif !important;
    font-size: 18px !important;
    line-height: 1.35 !important;
    text-align: right !important;
    white-space: nowrap !important;
}

.lesson-content .truth-table th,
.lesson-content .step-table th {
    background: #ecfdf5 !important;
    color: #115e59 !important;
}

.lesson-content .truth-table td,
.lesson-content .step-table td {
    background: #ffffff !important;
    color: #111827 !important;
}

.lesson-content .content-body table:not(.mat):not(.source-table) {
    display: block;
    width: 100% !important;
    max-width: 980px;
    margin: 18px 0 28px;
    overflow-x: auto;
    border: 1px solid rgba(15, 23, 42, 0.12) !important;
    border-radius: 8px;
    border-collapse: separate !important;
    border-spacing: 0 !important;
    background: #ffffff !important;
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
}

.lesson-content .content-body table:not(.mat):not(.source-table) thead,
.lesson-content .content-body table:not(.mat):not(.source-table) tbody {
    display: table;
    width: 100%;
    min-width: 620px;
    border-collapse: separate;
    border-spacing: 0;
}

.lesson-content .content-body table:not(.mat):not(.source-table) tr {
    background: transparent !important;
}

.lesson-content .content-body table:not(.mat):not(.source-table) th {
    padding: 13px 16px !important;
    border: 0 !important;
    border-bottom: 1px solid rgba(15, 118, 110, 0.18) !important;
    background: #ecfdf5 !important;
    color: #115e59 !important;
    font-size: 0.82rem;
    font-weight: 900;
    letter-spacing: 0;
    text-align: left;
    text-transform: uppercase;
}

.lesson-content .content-body table:not(.mat):not(.source-table) td {
    padding: 13px 16px !important;
    border: 0 !important;
    border-bottom: 1px solid rgba(17, 24, 39, 0.08) !important;
    background: #ffffff !important;
    color: #1f2937 !important;
    vertical-align: top;
}

.lesson-content .content-body table:not(.mat):not(.source-table) tbody tr:nth-child(even) td {
    background: #f8fafc !important;
}

.lesson-content .content-body table:not(.mat):not(.source-table) tr:last-child td {
    border-bottom: 0 !important;
}

.lesson-content .content-body table:not(.mat):not(.source-table) code {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    padding: 2px 7px;
    border: 1px solid rgba(15, 118, 110, 0.16);
    border-radius: 6px;
    background: rgba(236, 253, 245, 0.78);
    color: #115e59;
    font-size: 0.9em;
    font-weight: 800;
}

.lesson-content pre:not(.source-text):not(.source-text-readable):not(.source-math-block) {
    width: 100%;
    max-width: 980px;
    margin: 18px 0 28px;
    padding: 24px 28px !important;
    border: 1px solid rgba(255, 255, 255, 0.08) !important;
    border-radius: 8px !important;
    background: #111827 !important;
    color: #f8fafc !important;
    font-family: "Cascadia Code", Consolas, ui-monospace, SFMono-Regular, monospace !important;
    font-size: 0.98rem;
    font-weight: 700;
    line-height: 1.62;
    overflow-x: auto !important;
    white-space: pre;
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.22);
}

.lesson-content pre:not(.source-text):not(.source-text-readable):not(.source-math-block) code,
.lesson-content pre:not(.source-text):not(.source-text-readable):not(.source-math-block) * {
    padding: 0;
    border: 0;
    background: transparent !important;
    color: #f8fafc !important;
    font: inherit;
}

.lesson-content .truth-table tr:nth-child(even) td,
.lesson-content .step-table tr:nth-child(even) td {
    background: #f8fafc !important;
}

.lesson-content .mat-label,
.lesson-content .op,
.lesson-content .eq,
.lesson-content .sym,
.lesson-content .dim-arrow {
    color: #111827 !important;
}

.lesson-content .nf-badge {
    color: #ffffff !important;
}

.lesson-content [style*="#7dd3fc"],
.lesson-content [style*="#38bdf8"],
.lesson-content [style*="#a78bfa"],
.lesson-content [style*="#f59e0b"],
.lesson-content [style*="#e07b39"],
.lesson-content [style*="#94a3b8"],
.lesson-content [style*="#64748b"],
.lesson-content [style*="#e2e8f0"],
.lesson-content [style*="#f1f5f9"],
.lesson-content [style*="#bbf7d0"],
.lesson-content [style*="#fca5a5"],
.lesson-content [style*="#d4d4d4"],
.lesson-content [style*="#ccc"] {
    color: #111827 !important;
}

.lesson-content [style*="#22c55e"],
.lesson-content [style*="#86efac"],
.lesson-content .sign-plus {
    color: #047857 !important;
}

.lesson-content [style*="#ef4444"],
.lesson-content [style*="#f87171"],
.lesson-content .sign-minus {
    color: #b91c1c !important;
}

.source-table-wrap {
    max-width: 980px;
    overflow-x: auto;
    margin: 18px 0 28px;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
}

.source-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
}

.source-table th,
.source-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--line);
    text-align: center;
}

.source-table th {
    background: #ecfdf5;
    color: var(--primary-dark);
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

.source-table td {
    font-family: "Cascadia Code", Consolas, monospace;
    color: #243044;
}

.source-table tbody tr:nth-child(even) td {
    background: #f8fafc;
}

.source-binary-table td:nth-child(2),
.source-binary-table td:nth-child(4),
.source-compact-table td:nth-child(2),
.source-bit-table td:not(:first-child) {
    color: #0f766e;
    font-weight: 800;
}

.source-visual {
    max-width: 980px;
    overflow: hidden;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
}

.source-visual figcaption {
    margin: 0;
    padding: 14px 18px;
    background: #fbbf24;
    color: #111827;
    font-size: 22px;
    font-weight: 900;
    line-height: 1.2;
}

.value-chain-body {
    display: grid;
    grid-template-columns: 82px minmax(0, 1fr) 66px;
    gap: 10px;
    padding: 20px;
}

.value-chain-label {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #334155;
    font-size: 13px;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
}

.value-chain-support-label {
    grid-column: 1;
    grid-row: 1;
}

.value-chain-primary-label {
    grid-column: 1;
    grid-row: 2;
}

.value-chain-support,
.value-chain-primary,
.source-flow-visual ol,
.source-exhibit-visual ul,
.source-network-visual ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

.value-chain-support {
    grid-column: 2;
    grid-row: 1;
    display: grid;
    gap: 6px;
}

.value-chain-support li {
    padding: 10px 12px;
    border-radius: 4px;
    color: #1f2937;
    font-size: 13px;
    font-weight: 800;
    text-align: center;
}

.value-chain-support li:nth-child(1) {
    background: #fdb462;
}

.value-chain-support li:nth-child(2) {
    background: #b7d3a8;
}

.value-chain-support li:nth-child(3) {
    background: #bae6fd;
}

.value-chain-support li:nth-child(4) {
    background: #fde68a;
}

.value-chain-primary {
    grid-column: 2;
    grid-row: 2;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    overflow: hidden;
    border-radius: 6px;
}

.value-chain-primary li {
    display: flex;
    align-items: end;
    justify-content: center;
    min-height: 96px;
    padding: 14px 6px;
    color: #ffffff;
    font-size: 12px;
    font-weight: 900;
    line-height: 1.25;
    text-align: center;
    overflow-wrap: anywhere;
}

.value-chain-primary li:nth-child(1) {
    background: #0369a1;
}

.value-chain-primary li:nth-child(2) {
    background: #9a3412;
}

.value-chain-primary li:nth-child(3) {
    background: #be123c;
}

.value-chain-primary li:nth-child(4) {
    background: #a16207;
}

.value-chain-primary li:nth-child(5) {
    background: #a21caf;
}

.value-chain-primary li:nth-child(6) {
    background: #0e7490;
}

.value-chain-margin {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    background: #3f6f48;
    color: #ffffff;
    font-size: 13px;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
}

.value-chain-margin-top {
    grid-column: 3;
    grid-row: 1;
}

.value-chain-margin-bottom {
    grid-column: 3;
    grid-row: 2;
}

.source-flow-visual ol {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
    padding: 22px;
    counter-reset: source-flow;
}

.source-flow-visual li {
    position: relative;
    min-height: 92px;
    padding: 18px 16px 16px;
    border: 1px solid rgba(37, 99, 235, 0.18);
    border-radius: 8px;
    background: #eff6ff;
    color: #1e3a8a;
    font-weight: 800;
    line-height: 1.3;
}

.source-flow-visual li::before {
    counter-increment: source-flow;
    content: counter(source-flow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    margin-bottom: 12px;
    border-radius: 999px;
    background: #2563eb;
    color: #ffffff;
    font-size: 13px;
}

.source-exhibit-visual ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 12px;
    padding: 22px;
}

.source-exhibit-visual li {
    min-height: 86px;
    padding: 14px;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background: #f0fdfa;
    color: #134e4a;
    font-weight: 800;
    line-height: 1.35;
}

.network-visual-body {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 18px;
    align-items: center;
    padding: 22px;
}

.network-core {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 130px;
    border-radius: 999px;
    background: #0f766e;
    color: #ffffff;
    font-size: 20px;
    font-weight: 900;
}

.source-network-visual ol {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
}

.source-network-visual li {
    min-height: 76px;
    padding: 14px;
    border: 1px solid rgba(251, 191, 36, 0.38);
    border-radius: 8px;
    background: #fffbeb;
    color: #713f12;
    font-weight: 900;
    line-height: 1.3;
}

.source-file-meta {
    margin: 0.75rem 0 1rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.source-slide-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1.25rem 0 1.75rem;
}

.source-slide-shot {
    margin: 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
    background: var(--surface);
}

.source-slide-shot img {
    display: block;
    width: 100%;
    height: auto;
    background: #fff;
}

.source-slide-shot figcaption {
    padding: 0.55rem 0.7rem;
    color: var(--muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--line);
}

.recording-note {
    max-width: 920px;
    padding: 12px 14px;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background: #f0fdfa;
    color: #134e4a;
}

.recording-permission {
    max-width: 920px;
    padding: 12px 14px;
    border: 1px solid rgba(180, 83, 9, 0.24);
    border-radius: 8px;
    background: #fff7ed;
    color: #7c2d12;
}

.canvas-recording-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 18px;
    margin: 1.25rem 0 1.75rem;
}

.canvas-recording-card {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
}

.canvas-recording-frame {
    aspect-ratio: 16 / 9;
    background: #0f172a;
}

.canvas-recording-frame iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
}

.canvas-recording-body {
    display: grid;
    gap: 10px;
    padding: 16px;
}

.canvas-recording-body h3,
.canvas-recording-body p {
    margin: 0;
}

.recording-url {
    overflow-wrap: anywhere;
    padding: 10px 12px;
    border: 1px solid rgba(15, 118, 110, 0.16);
    border-radius: 8px;
    background: #f8fafc;
    color: #243044;
    font-size: 0.86rem;
    line-height: 1.45;
}

.recording-url strong {
    color: #115e59;
}

.recording-url a {
    color: var(--primary-dark);
    font-weight: 800;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.recording-kicker {
    color: var(--primary-dark);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.recording-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.recording-actions a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 12px;
    border: 1px solid rgba(15, 118, 110, 0.24);
    border-radius: 8px;
    background: #ffffff;
    color: var(--primary-dark);
    font-size: 0.9rem;
    font-weight: 800;
}

.echo-link-summary {
    max-width: 920px;
    padding: 12px 14px;
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: 8px;
    background: #f0fdfa;
    color: #134e4a;
}

.echo-link-index {
    display: grid;
    gap: 20px;
    margin: 1.25rem 0 1.75rem;
}

.echo-link-group {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.07);
}

.echo-link-group h3 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 0 0 16px;
    color: var(--text);
}

.echo-link-group h3 span {
    flex: 0 0 auto;
    padding: 4px 9px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.1);
    color: var(--primary-dark);
    font-size: 0.78rem;
    font-weight: 900;
}

.echo-link-page {
    display: grid;
    gap: 10px;
    padding-top: 14px;
    border-top: 1px solid var(--line);
}

.echo-link-page + .echo-link-page {
    margin-top: 16px;
}

.echo-link-page h4 {
    margin: 0;
    color: var(--primary-dark);
    font-size: 0.98rem;
}

.echo-link-list {
    display: grid;
    gap: 9px;
    margin: 0;
    padding-left: 1.4rem;
}

.echo-link-item {
    padding: 10px 12px;
    border: 1px solid rgba(15, 118, 110, 0.14);
    border-radius: 8px;
    background: #f8fafc;
}

.echo-link-label {
    display: block;
    margin-bottom: 5px;
    color: #243044;
    font-size: 0.86rem;
    font-weight: 900;
}

.echo-link-url {
    display: block;
    color: var(--primary-dark);
    font-size: 0.84rem;
    font-weight: 800;
    line-height: 1.45;
    overflow-wrap: anywhere;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

@media (max-width: 760px) {
    .value-chain-body,
    .network-visual-body {
        grid-template-columns: 1fr;
    }

    .value-chain-support-label,
    .value-chain-primary-label,
    .value-chain-support,
    .value-chain-primary,
    .value-chain-margin-top,
    .value-chain-margin-bottom {
        grid-column: 1;
        grid-row: auto;
    }

    .value-chain-primary {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .value-chain-primary li {
        min-height: 78px;
    }

    .network-core {
        min-height: 94px;
    }

    .canvas-recording-gallery {
        grid-template-columns: 1fr;
    }

    .lesson-content .content-body table:not(.mat):not(.source-table),
    .source-table-wrap {
        max-width: calc(100vw - 32px);
        margin: 16px 0 24px;
    }

    .lesson-content .content-body table:not(.mat):not(.source-table) thead,
    .lesson-content .content-body table:not(.mat):not(.source-table) tbody,
    .source-table {
        min-width: 560px;
    }

    .lesson-content pre:not(.source-text):not(.source-text-readable):not(.source-math-block) {
        max-width: calc(100vw - 32px);
        padding: 18px 16px !important;
        font-size: 0.9rem;
        line-height: 1.58;
    }
}

.widget-panel {
    position: relative;
    overflow: hidden;
    border-color: rgba(13, 130, 119, 0.22);
    background:
        linear-gradient(135deg, rgba(237, 247, 245, 0.92), rgba(255, 247, 237, 0.74)),
        #ffffff;
    box-shadow: var(--shadow-sm);
}

.widget-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg, rgba(13, 130, 119, 0.08) 1px, transparent 1px),
        linear-gradient(rgba(13, 130, 119, 0.08) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.32;
    pointer-events: none;
}

.widget-stage {
    position: relative;
    display: flex;
    align-items: center;
}

.widget-flow {
    width: 100%;
}

.widget-node {
    box-shadow: 0 8px 18px rgba(16, 24, 40, 0.06);
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
    animation: node-in 360ms ease both;
}

.widget-node:hover {
    transform: translateY(-3px);
    border-color: rgba(13, 130, 119, 0.34);
    box-shadow: 0 14px 28px rgba(16, 24, 40, 0.1);
}

.exercise-heading span {
    padding: 4px 8px;
    border-radius: 999px;
    background: var(--surface-tint);
    color: var(--primary-dark);
    font-weight: 800;
}

.choice {
    border-radius: 8px;
    padding: 10px 12px;
    transition: background 160ms ease, transform 160ms ease;
}

.choice:hover {
    background: var(--surface-soft);
    transform: translateX(2px);
}

.guest-note {
    background: linear-gradient(135deg, #eef2ff, #edf7f5);
}

.data-row {
    border-bottom-color: rgba(152, 162, 179, 0.24);
}

@keyframes page-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes node-in {
    from {
        opacity: 0;
        transform: translateY(8px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 1ms !important;
        scroll-behavior: auto !important;
        transition-duration: 1ms !important;
    }
}

@media (max-width: 960px) {
    .hero::after {
        opacity: 0.36;
        right: -72px;
        bottom: 36px;
        width: 360px;
    }

    .course-layout {
        background: var(--bg);
    }
}

@media (max-width: 800px) {
    .topbar {
        min-height: auto;
    }

    .hero {
        min-height: 480px;
        padding: 64px 22px;
    }

    .hero::after {
        display: none;
    }

    .section-heading h1 {
        font-size: 36px;
    }

    .subject-card:hover,
    .lesson-row:hover,
    .exercise:hover {
        transform: none;
    }

    .content-body pre.source-math-block {
        padding: 16px;
        font-size: 15px;
        text-align: left;
    }

    .lesson-content .content-body .mat td {
        min-width: 22px !important;
        font-size: 15px !important;
    }

    .lesson-content .content-body .calc-row,
    .lesson-content .content-body .calc-card,
    .lesson-content .content-body .component-formulas div {
        grid-template-columns: 1fr !important;
    }

    .lesson-content .content-body .lesson-structured-block {
        max-width: calc(100vw - 32px) !important;
        padding: 14px !important;
    }

    .lesson-content .content-body .lesson-relation-row {
        grid-template-columns: 1fr !important;
        gap: 8px !important;
        align-items: start !important;
    }

    .lesson-content .content-body .calc-result {
        justify-self: start !important;
    }

    .lesson-source h2 {
        padding: 16px;
        font-size: 21px;
    }

    .lesson-source h3 {
        font-size: 18px;
    }

    .lesson-source p,
    .source-list,
    .source-numbered-list,
    .source-overview-list {
        padding-left: 0;
        font-size: 16px;
    }

    .source-overview-list,
    .source-definition-list {
        grid-template-columns: 1fr;
    }

    .source-definition-list dt {
        border-bottom: 0;
    }
}


/* ── Practice Mode ─────────────────────────────────────────────────── */
.practice-cta {
    margin-top: 12px;
    align-self: flex-start;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}
.practice-cta:hover { background: var(--primary-dark); color: #fff; }

.course-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.practice-shell {
    max-width: 680px;
    margin: 0 auto;
    padding: 24px 16px 64px;
}

.practice-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.practice-back {
    font-size: 14px;
    color: var(--muted);
    text-decoration: none;
}
.practice-back:hover { color: var(--text); }
.practice-label {
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--primary);
}
.practice-counter {
    font-size: 13px;
    color: var(--muted);
}

.practice-progress-track {
    height: 6px;
    background: var(--line);
    border-radius: 99px;
    margin-bottom: 28px;
    overflow: hidden;
}
.practice-progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 99px;
    transition: width .4s ease;
    width: 0%;
}

.practice-card {
    background: var(--surface);
    border-radius: 16px;
    border: 1px solid var(--line);
    padding: 32px 28px;
    box-shadow: 0 2px 12px rgba(0,0,0,.06);
}

.practice-breadcrumb {
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 16px;
    letter-spacing: .02em;
}

.practice-question {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.5;
    margin: 0 0 24px;
    color: var(--text);
}

.practice-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-btn {
    width: 100%;
    text-align: left;
    padding: 14px 18px;
    border-radius: 10px;
    border: 2px solid var(--line);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    font-size: 15px;
    line-height: 1.4;
    transition: border-color .15s, background .15s, transform .1s;
}
.option-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: #f0fdf9;
    transform: translateX(3px);
}
.option-btn.correct {
    border-color: #16a34a;
    background: #f0fdf4;
    color: #15803d;
    font-weight: 600;
}
.option-btn.wrong {
    border-color: var(--danger);
    background: #fef2f2;
    color: var(--danger);
    font-weight: 600;
}
.option-btn:disabled { cursor: default; transform: none; }

.practice-feedback {
    margin-top: 18px;
    padding: 12px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
}
.fb-correct { background: #f0fdf4; color: #15803d; border: 1.5px solid #bbf7d0; }
.fb-wrong   { background: #fef2f2; color: var(--danger); border: 1.5px solid #fecaca; }

.practice-next {
    margin-top: 20px;
    width: 100%;
    padding: 14px;
    border-radius: 10px;
    border: 0;
    background: var(--primary);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s;
}
.practice-next:hover { background: var(--primary-dark); }

/* Result screen */
.practice-result {
    background: var(--surface);
    border-radius: 16px;
    border: 1px solid var(--line);
    padding: 48px 28px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.result-emoji { font-size: 52px; margin-bottom: 12px; }
.practice-result h2 { margin: 0 0 8px; font-size: 26px; }
.practice-result p  { margin: 0 0 24px; color: var(--muted); }

.result-score-ring {
    position: relative;
    width: 140px;
    margin: 0 auto 16px;
}
.result-score-ring svg { width: 140px; height: 140px; }
.result-score-ring circle { transition: stroke-dashoffset 1s ease; }
#scorePercent {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    font-weight: 800;
    color: var(--primary);
}
.result-detail { font-size: 15px; color: var(--muted); margin-bottom: 32px !important; }

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}
.button.secondary {
    background: var(--bg);
    color: var(--text);
    border: 1.5px solid var(--line);
}
.button.secondary:hover { border-color: var(--primary); color: var(--primary); }

.hidden { display: none !important; }

/* ===== WIDGET PANEL ===== */
.widget-panel { margin: 2rem 0; }
.wg-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
  font-size: 0.9rem;
}
.wg-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 1rem;
}

/* Matrix widgets */
.wg-mat-box { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.wg-matmult { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.wg-op-sym { font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.mat-grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 4px; }
.mat-grid-2 input, .mval {
  width: 52px; height: 36px; text-align: center;
  border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--text); font-size: 0.9rem;
}
.mval { display: flex; align-items: center; justify-content: center; font-weight: 600; }
.result-box {
  margin-top: 1rem; padding: 0.75rem 1rem;
  background: color-mix(in srgb,var(--primary) 8%,transparent);
  border: 1px solid color-mix(in srgb,var(--primary) 30%,transparent);
  border-radius: 8px; font-weight: 600; font-size: 0.95rem;
  color: var(--primary);
}
.wg-formula { font-family: monospace; font-size: 0.82rem; color: var(--muted); margin-top: 0.5rem; }
.det-badge {
  display: inline-block; margin-top: .5rem; padding: .25rem .75rem;
  border-radius: 999px; font-size: .78rem; font-weight: 700;
}
.det-badge.singular { background:#fee2e2; color:#b91c1c; }
.det-badge.nonsingular { background:#d1fae5; color:#065f46; }

/* Vector 2D / Canvas widgets */
.wg-canvas { display: block; border-radius: 8px; background: var(--bg); border: 1px solid var(--line); max-width: 100%; }
.wg-sliders { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; margin-top: 0.75rem; }
.wg-sliders label { display: flex; flex-direction: column; gap: 2px; font-size: 0.82rem; color: var(--muted); }
.wg-sliders input[type=range] { accent-color: var(--primary); }
.wg-stat { font-size: 0.82rem; margin-top: 0.5rem; color: var(--text); }
.wg-btn {
  margin-top: 0.75rem; padding: .4rem 1rem; border-radius: 6px;
  border: 1px solid var(--primary); background: transparent;
  color: var(--primary); font-size: .84rem; cursor: pointer;
}
.wg-btn:hover { background: var(--primary); color: #fff; }

/* Binary converter */
.wg-bits { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: .75rem; }
.bit-btn {
  width: 38px; height: 38px; border-radius: 6px; border: 1.5px solid var(--line);
  font-size: 1rem; font-weight: 700; cursor: pointer; transition: .15s;
  background: var(--bg); color: var(--text);
}
.bit-btn.bit-on { background: var(--primary); color: #fff; border-color: var(--primary); }
.bit-btn.bit-off { background: var(--surface); }
.wg-bit-labels { display: flex; gap: 4px; margin-bottom: 4px; }
.wg-bit-labels span { width: 38px; text-align: center; font-size: 0.68rem; color: var(--muted); }
.wg-bit-inputs { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: .5rem; }
.wg-bit-inputs label { font-size: .82rem; color: var(--muted); display: flex; flex-direction: column; gap: 2px; }
.wg-bit-inputs input { width: 90px; padding: .3rem .5rem; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--text); }

/* Two's complement steps */
.tc-steps { display: flex; flex-direction: column; gap: .5rem; margin-top: .75rem; }
.tc-step { display: flex; align-items: baseline; gap: .75rem; }
.tc-tag { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); min-width: 80px; }
.tc-row { font-family: monospace; font-size: 1rem; letter-spacing: .1em; color: var(--text); }
.tc-row span.flipped { color: var(--primary); font-weight: 700; }

/* Variable box / memory model */
.wg-mem-grid { display: flex; flex-wrap: wrap; gap: .5rem; margin: .75rem 0; }
.mem-box {
  min-width: 70px; padding: .5rem .75rem; border-radius: 8px;
  border: 1.5px solid var(--line); text-align: center; font-size: .82rem;
}
.mem-box .mb-name { font-size: .7rem; color: var(--muted); }
.mem-box .mb-val { font-size: 1rem; font-weight: 700; font-family: monospace; }
.mem-box[data-type=int] { border-color: #6366f1; }
.mem-box[data-type=float] { border-color: #f59e0b; }
.mem-box[data-type=str] { border-color: #10b981; }
.mem-box[data-type=bool] { border-color: #ef4444; }
.wg-mem-form { display: flex; gap: .5rem; flex-wrap: wrap; }
.wg-mem-form input, .wg-mem-form select {
  padding: .3rem .6rem; border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--text); font-size: .84rem;
}

/* Loop tracer */
.wg-loop-track { display: flex; gap: 4px; flex-wrap: wrap; margin: .75rem 0; }
.loop-cell {
  min-width: 42px; padding: .35rem .5rem; border-radius: 6px;
  border: 1.5px solid var(--line); text-align: center; font-size: .8rem;
  transition: .2s; background: var(--bg);
}
.loop-cell.active { background: var(--primary); color: #fff; border-color: var(--primary); transform: scale(1.08); }
.loop-cell.done { background: color-mix(in srgb,var(--primary) 15%,transparent); color: var(--primary); }
.wg-loop-ctrl { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }
.wg-loop-out { font-family: monospace; font-size: .84rem; color: var(--muted); margin-top: .5rem; min-height: 1.4em; }

/* 4Ps cards */
.wg-4ps { display: grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap: .75rem; }
.ps-card {
  border: 1.5px solid var(--line); border-radius: 10px; overflow: hidden; cursor: pointer;
}
.ps-head {
  padding: .6rem .75rem; font-weight: 700; font-size: .85rem;
  background: var(--primary); color: #fff;
}
.ps-list { display: none; padding: .5rem .75rem; }
.ps-list.open { display: block; }
.ps-list li { font-size: .82rem; color: var(--text); padding: .15rem 0; }

/* Maslow pyramid */
.maslow-pyramid { display: flex; flex-direction: column; gap: 4px; width: 100%; }
.maslow-row { display: flex; align-items: center; gap: .75rem; }
.maslow-bar {
  height: 32px; border-radius: 4px; display: flex; align-items: center;
  padding: 0 .75rem; font-size: .8rem; color: #fff; font-weight: 600; white-space: nowrap;
}
.maslow-desc { font-size: .78rem; color: var(--muted); }

/* Normalization stepper */
.nf-steps-nav { display: flex; gap: .5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.nf-step-btn {
  padding: .3rem .8rem; border-radius: 6px; border: 1.5px solid var(--line);
  font-size: .8rem; cursor: pointer; background: var(--bg); color: var(--text);
}
.nf-step-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.nf-panel { display: none; }
.nf-panel.active { display: block; }
.nf-table { width: 100%; border-collapse: collapse; font-size: .82rem; margin-top: .5rem; }
.nf-table th, .nf-table td { border: 1px solid var(--line); padding: .3rem .6rem; }
.nf-table th { background: var(--surface); font-weight: 700; }
.nf-badge {
  display: inline-block; padding: .15rem .6rem; border-radius: 999px;
  font-size: .72rem; font-weight: 700; margin-left: .5rem;
}
.nf-badge.violation { background: #fee2e2; color: #b91c1c; }
.nf-badge.ok { background: #d1fae5; color: #065f46; }

/* SQL Join SVG widget */
.wg-join-btns { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: .75rem; }
.join-btn {
  padding: .3rem .9rem; border-radius: 6px; border: 1.5px solid var(--line);
  font-size: .8rem; cursor: pointer; background: var(--bg); color: var(--text);
}
.join-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.wg-svg { display: block; max-width: 100%; border-radius: 8px; }
.er-legend { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: .5rem; font-size: .78rem; color: var(--muted); }
.er-legend span::before { content: '●'; margin-right: .3rem; }