:root {
    color-scheme: light;
    --bg: #f5f7f9;
    --panel: #ffffff;
    --panel-strong: #eef2f5;
    --text: #1e252b;
    --muted: #5f6b76;
    --border: #d7dde3;
    --accent: #0f766e;
    --accent-strong: #0b5852;
    --success: #177245;
    --code-bg: #101820;
    --code-text: #f3f7fb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", Arial, sans-serif;
}

button,
input,
textarea {
    font: inherit;
}

.app-shell {
    display: grid;
    grid-template-columns: 284px minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100dvh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    border-right: 1px solid var(--border);
    background: #fbfcfd;
    padding: 24px 16px;
    scrollbar-width: thin;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 8px 4px;
}

.brand-mark {
    display: block;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
}

.brand h1,
.brand p,
.workspace-header h2,
.workspace-header p {
    margin: 0;
}

.brand h1 {
    font-size: 18px;
}

.brand p,
.eyebrow,
.save-status,
.search-label {
    color: var(--muted);
    font-size: 13px;
}

.brand p {
    margin-top: 3px;
    font-size: 12px;
}

.primary-nav,
.nav-group {
    display: grid;
    gap: 4px;
}

.primary-nav {
    gap: 12px;
}

.nav-group:not(:first-child) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.nav-group:not(:first-child) .nav-group-label {
    grid-column: 1 / -1;
}

.nav-group:not(:first-child) .nav-link {
    gap: 7px;
    padding: 8px 7px;
    font-size: 12px;
}

.nav-group:not(:first-child) .nav-link svg {
    width: 16px;
    height: 16px;
}

.nav-group-label {
    margin: 0 10px 5px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 11px;
    width: 100%;
    border: 1px solid transparent;
    border-radius: 8px;
    background: transparent;
    color: #4b5965;
    cursor: pointer;
    padding: 9px 11px;
    font-size: 14px;
    text-align: left;
}

.nav-link:hover {
    background: #edf2f4;
}

.nav-link.active {
    border-color: #c4e4dd;
    background: #e6f3ef;
    color: #0d625a;
    font-weight: 650;
}

.nav-link svg {
    display: block;
    width: 19px;
    height: 19px;
    flex: none;
}

.sidebar-progress {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: white;
}

.sidebar-progress p {
    margin: 0 0 10px;
    color: var(--muted);
    font-size: 12px;
}

.course-outline {
    display: grid;
    gap: 10px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.outline-group summary {
    padding: 11px 5px;
    color: #4b5965;
    cursor: pointer;
    font-size: 12px;
    font-weight: 650;
}

.outline-group summary span {
    margin-left: 6px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 400;
}

.outline-empty {
    padding: 8px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

.progress-track {
    height: 8px;
    overflow: hidden;
    border-radius: 999px;
    background: var(--panel-strong);
}

.progress-bar {
    width: 0;
    height: 100%;
    background: var(--success);
    transition: width 180ms ease;
}

.search-label {
    font-weight: 600;
}

.search-input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    background: #fff;
}

.lesson-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.lesson-button {
    display: grid;
    grid-template-columns: 25px minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px;
    width: 100%;
    border: 1px solid transparent;
    border-radius: 8px;
    background: transparent;
    color: var(--text);
    cursor: pointer;
    padding: 9px 8px;
    font-size: 12px;
    text-align: left;
}

.lesson-button:hover,
.lesson-button.active {
    border-color: var(--border);
    background: var(--panel-strong);
}

.lesson-id {
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.lesson-name {
    line-height: 1.45;
    overflow-wrap: anywhere;
}

.lesson-check {
    color: var(--success);
    font-weight: 700;
    font-size: 11px;
}

.workspace {
    display: flex;
    min-width: 0;
    flex-direction: column;
}

.workspace-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
    padding: 24px 36px 20px;
}

.header-main {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.header-copy {
    min-width: 0;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
    color: var(--muted);
    font-size: 12px;
}

.breadcrumbs button {
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font: inherit;
}

.breadcrumbs button:hover {
    color: var(--accent);
    text-decoration: underline;
}

.workspace-header .eyebrow {
    margin-bottom: 6px;
    color: var(--accent);
    font-size: 11px;
    font-weight: 650;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.workspace-header h2 {
    font-size: clamp(22px, 2.2vw, 30px);
    line-height: 1.3;
    overflow-wrap: anywhere;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.complete-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-weight: 600;
}

.language-control {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
}

.language-control select {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    color: var(--text);
    padding: 8px 10px;
}

.docs-link,
.primary-button {
    border: 1px solid var(--accent);
    border-radius: 8px;
    background: var(--accent);
    color: white;
    cursor: pointer;
    padding: 9px 12px;
    text-decoration: none;
}

.docs-link:hover,
.primary-button:hover {
    background: var(--accent-strong);
}

.tabbar {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 24px;
    padding: 0 36px;
    scrollbar-width: thin;
}

.tab {
    border: 0;
    border-bottom: 2px solid transparent;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    padding: 15px 0 13px;
    font-size: 13px;
    white-space: nowrap;
}

.tab.active {
    border-bottom-color: var(--accent);
    color: var(--accent);
    font-weight: 700;
}

.context-toolbar {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
}

.reading-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 36px;
}

.reading-controls .complete-toggle {
    font-size: 12px;
}

.lesson-pager {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
}

.pager-button,
.icon-button {
    border: 1px solid var(--border);
    border-radius: 7px;
    background: white;
    color: var(--text);
    cursor: pointer;
    padding: 7px 11px;
    font-size: 12px;
}

.pager-button:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.pager-button:disabled {
    opacity: 0.4;
    cursor: default;
}

.position-text {
    color: var(--muted);
    font-size: 12px;
    white-space: nowrap;
}

.mobile-only {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: fixed;
    top: -60px;
    left: 16px;
    z-index: 50;
    border-radius: 6px;
    padding: 12px;
    background: var(--accent);
    color: white;
}

.skip-link:focus {
    top: 12px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
    outline: 3px solid #4bb3a5;
    outline-offset: 3px;
}

.content-panel,
.notes-panel {
    width: min(1040px, calc(100% - 72px));
    margin: 28px auto;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel);
    padding: clamp(22px, 3vw, 40px);
    box-shadow: 0 3px 14px rgba(26, 44, 62, 0.025);
}

.content-panel h1 {
    margin-top: 0;
    font-size: 30px;
}

.content-panel h2 {
    margin-top: 30px;
    border-top: 1px solid var(--border);
    padding-top: 22px;
    font-size: 22px;
}

.content-panel h3 {
    margin-top: 24px;
}

.content-panel p,
.content-panel li {
    line-height: 1.65;
}

.content-panel code {
    border-radius: 5px;
    background: var(--panel-strong);
    padding: 2px 5px;
}

.content-panel pre {
    overflow: auto;
    border-radius: 8px;
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px;
}

.content-panel pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.quiz-intro,
.exam-grid {
    display: grid;
    gap: 14px;
}

.question-card,
.exam-card,
.score-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    padding: 16px;
}

.question-card {
    margin-top: 14px;
}

.question-title {
    margin: 0 0 12px;
    font-weight: 700;
    white-space: pre-line;
}

.option-row {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    margin: 8px 0;
    line-height: 1.45;
}

.option-row input {
    margin-top: 3px;
}

.option-row span {
    white-space: pre-line;
}

.score-card {
    margin-top: 18px;
    border-color: var(--accent);
}

.score-card.pass {
    border-color: var(--success);
}

.score-card.fail {
    border-color: #b95032;
}

.exercise-layout {
    display: grid;
    gap: 18px;
}

.exercise-instructions {
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
}

.exercise-instructions h1 {
    margin-top: 0;
}

.exercise-work-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    padding: 18px;
}

.coding-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 20px;
}

.coding-heading h1 {
    margin-top: 0;
}

.coding-heading button {
    flex-shrink: 0;
}

.coding-heading-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.coding-picker {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
    gap: 10px;
}

.coding-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--panel);
    color: var(--text);
    text-align: left;
    cursor: pointer;
    overflow-wrap: anywhere;
}

.coding-link.active {
    border-color: var(--accent);
    background: #e9f5f2;
}

.coding-state {
    color: var(--muted);
    font-size: 13px;
}

.coding-state.passed,
.coding-passed {
    color: var(--success);
    font-weight: 700;
}

.coding-hint {
    padding: 12px 0;
    border-top: 1px solid var(--border);
}

.coding-hint summary {
    cursor: pointer;
    color: var(--accent-strong);
    font-weight: 600;
}

.editor-label {
    display: block;
    margin: 12px 0 8px;
    font-weight: 600;
}

@media (max-width: 600px) {
    .coding-heading {
        flex-direction: column;
    }
}

.challenge-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    margin-top: 18px;
    padding: 18px;
}

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

.visible-tests {
    display: grid;
    gap: 8px;
    padding-left: 18px;
}

.exercise-work-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 14px;
}

.exercise-work-header h2,
.exercise-work-header p {
    margin-top: 0;
}

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

#exerciseEditor {
    width: 100%;
    min-height: 360px;
    resize: vertical;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--code-bg);
    color: var(--code-text);
    padding: 14px;
    font-family: Consolas, "Courier New", monospace;
    font-size: 14px;
    line-height: 1.5;
}

.exercise-input-label {
    display: block;
    margin: 14px 0 6px;
    font-weight: 700;
}

#exerciseInput {
    width: 100%;
    min-height: 90px;
    resize: vertical;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-family: Consolas, "Courier New", monospace;
    line-height: 1.5;
}

.runner-warning {
    color: var(--muted);
    font-size: 13px;
}

.exercise-run-result {
    margin-top: 14px;
}

.runner-result {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
}

.runner-result.pass {
    border-color: var(--success);
}

.runner-result.fail {
    border-color: #b95032;
}

.runner-result h3,
.runner-result h4 {
    margin-top: 0;
}

.runner-output-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
}

.runner-output-grid pre {
    min-height: 90px;
    margin: 0;
}

.check-result-list {
    display: grid;
    gap: 10px;
    padding-left: 20px;
}

.check-result-list li.pass strong {
    color: var(--success);
}

.check-result-list li.fail strong {
    color: #b95032;
}

.result-list {
    padding-left: 20px;
}

.roadmap-hero,
.next-step,
.roadmap-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    padding: 18px;
}

.roadmap-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 16px;
}

.roadmap-hero h1,
.roadmap-hero p,
.next-step h2,
.next-step p,
.roadmap-card h2,
.roadmap-card p {
    margin-top: 0;
}

.roadmap-score {
    display: grid;
    min-width: 150px;
    gap: 4px;
    text-align: right;
}

.roadmap-score strong {
    color: var(--success);
    font-size: 34px;
}

.roadmap-score span,
.phase-complete {
    color: var(--muted);
    font-size: 13px;
}

.next-step {
    margin-bottom: 16px;
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.roadmap-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.roadmap-card-header h2 {
    font-size: 20px;
}

.roadmap-track {
    margin: 12px 0 6px;
}

.roadmap-lessons {
    display: grid;
    gap: 8px;
    padding-left: 0;
    list-style: none;
}

.roadmap-lessons li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border-top: 1px solid var(--border);
    padding-top: 8px;
}

.roadmap-lessons li.done span {
    color: var(--success);
    font-weight: 700;
}

.link-button {
    border: 0;
    background: transparent;
    color: var(--accent);
    cursor: pointer;
    padding: 0;
    text-align: left;
}

.link-button:hover {
    color: var(--accent-strong);
    text-decoration: underline;
}

.exam-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.exam-card h3 {
    margin: 0 0 8px;
}

.fastapi-doc-grid {
    margin-bottom: 18px;
}

.active-doc-card {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.12);
}

.exam-meta {
    color: var(--muted);
    font-size: 13px;
}

.track-modules {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    gap: 10px;
    margin: 20px 0;
}

.track-module {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel);
    color: var(--text);
    text-align: left;
    cursor: pointer;
}

.track-module span:last-child {
    color: var(--muted);
    font-size: 12px;
}

.track-detail {
    padding: 16px;
    border-left: 4px solid var(--accent);
    background: var(--panel-strong);
    margin-bottom: 24px;
}

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

.secondary-button {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    color: var(--text);
    cursor: pointer;
    padding: 9px 12px;
}

.secondary-button:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.notes-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.notes-header h3 {
    margin: 0;
}

#notesEditor {
    width: 100%;
    min-height: 420px;
    resize: vertical;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
    font-family: Consolas, "Courier New", monospace;
    line-height: 1.5;
}

.hidden {
    display: none;
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: min(320px, 86vw);
        height: 100dvh;
        z-index: 40;
        transform: translateX(-100%);
        visibility: hidden;
        transition: transform 160ms ease;
        box-shadow: 12px 0 40px rgba(17, 34, 51, 0.12);
    }

    .sidebar.open {
        transform: translateX(0);
        visibility: visible;
    }

    body.sidebar-open {
        overflow: hidden;
    }

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        z-index: 30;
        border: 0;
        background: rgba(15, 23, 42, 0.4);
    }

    .mobile-only {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-width: 38px;
        min-height: 38px;
        flex-shrink: 0;
    }

    .brand .icon-button {
        margin-left: auto;
        font-size: 22px;
    }

    .workspace-header {
        align-items: flex-start;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }

    .header-actions {
        align-self: flex-end;
    }

    .tabbar {
        padding: 0 20px;
        gap: 22px;
    }

    .reading-controls {
        padding: 10px 20px;
    }

    .lesson-pager {
        gap: 10px;
    }

    .roadmap-hero {
        align-items: flex-start;
        flex-direction: column;
    }

    .roadmap-score {
        text-align: left;
    }

    .exercise-work-header {
        flex-direction: column;
    }

    .exercise-actions {
        justify-content: flex-start;
    }

    .tabbar {
        overflow-x: auto;
    }

    .content-panel,
    .notes-panel {
        width: calc(100% - 28px);
        margin: 14px;
        padding: 18px;
    }
}

@media (max-width: 480px) {
    .reading-controls {
        flex-wrap: wrap;
    }

    .lesson-pager {
        justify-content: space-between;
        width: 100%;
    }

    .workspace-header h2 {
        font-size: 22px;
    }

    .content-panel h1 {
        font-size: 25px;
    }

    .roadmap-grid,
    .exam-grid,
    .runner-output-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .content-panel pre {
        max-width: 100%;
    }
}

.content-notice {
    padding: 12px 16px;
    border-left: 3px solid var(--accent);
    background: var(--panel-strong);
    color: var(--muted);
    line-height: 1.6;
}

.exam-session-bar {
    position: sticky;
    top: 8px;
    z-index: 5;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px 24px;
    padding: 14px 18px;
    margin: 20px 0;
    background: var(--panel);
    border: 1px solid var(--accent);
    border-radius: 12px;
    box-shadow: 0 4px 16px #10182012;
}

.exam-session-bar div {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.exam-session-bar strong {
    font-size: 24px;
    font-variant-numeric: tabular-nums;
    color: var(--accent-strong);
}

.exam-session-bar p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.domain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr));
    gap: 12px;
    margin: 18px 0;
}

.domain-result {
    padding: 14px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.domain-result h3 {
    margin: 0;
    font-size: 16px;
}

.option-row span {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.history-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 175px), 1fr));
    gap: 14px;
    margin: 24px 0;
}

.history-stats article {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel-strong);
}

.history-stats span, .history-tag {
    color: var(--muted);
    font-size: 13px;
}

.history-stats strong {
    font-size: 30px;
    color: var(--accent-strong);
}

.history-stats .history-date {
    font-size: 17px;
}

.history-level {
    margin: 30px 0;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.content-panel .history-level > h2 {
    margin-top: 0;
    padding-top: 8px;
    border-top: 0;
}

.history-trend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 12px;
    list-style: none;
    padding: 0;
    margin: 20px 0 32px;
}

.history-trend-button {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    height: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    background: var(--panel);
    text-align: left;
    cursor: pointer;
}

.history-trend-button:hover {
    border-color: var(--accent);
    background: var(--panel-strong);
}

.history-trend-button > span:not(.history-bar-track) {
    color: var(--muted);
    font-size: 12px;
    overflow-wrap: anywhere;
}

.history-bar-track {
    display: flex;
    align-items: flex-end;
    width: 100%;
    height: 90px;
    border-bottom: 1px solid var(--border);
    background: var(--panel-strong);
}

.history-bar-track span {
    width: 100%;
    background: var(--accent);
    border-radius: 4px 4px 0 0;
}

.history-priority {
    border-left: 3px solid #a65b10;
}

.history-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-start;
}

.history-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 10px;
    margin: 20px 0;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.history-table th, .history-table td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.history-table th {
    background: var(--panel-strong);
}

.history-table td:nth-child(2) {
    overflow-wrap: anywhere;
}

.history-warning {
    padding: 12px;
    border-left: 3px solid #a65b10;
    background: #fff5e9;
    color: #713b05;
}

.history-all {
    margin: 24px 0;
}

.history-all summary {
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

.history-empty {
    padding: 30px 0;
    color: var(--muted);
}

.revision-levels, .revision-recent {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: 16px;
    margin: 20px 0;
}

.revision-stats article {
    justify-content: space-between;
}

.content-panel .revision-levels h2 {
    margin: 0 0 16px;
    padding: 0;
    border: 0;
}

.revision-buttons {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 10px;
    margin: 16px 0;
}

.revision-buttons button:disabled, .revision-table button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.revision-resume {
    padding: 4px 18px 18px;
    border: 1px solid var(--accent);
    border-radius: 10px;
    background: var(--panel-strong);
}

.revision-resume button {
    margin: 6px;
}

.revision-schedule {
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--muted);
}

.revision-schedule summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--accent-strong);
}

.revision-feedback {
    padding: 16px;
    margin: 14px 0;
    border-left: 3px solid var(--accent);
    background: var(--panel-strong);
}

.revision-question h3 {
    overflow-wrap: anywhere;
}

.revision-table code {
    overflow-wrap: anywhere;
}

.backup-section {
    margin: 24px 0;
}

.backup-counts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
    gap: 10px 22px;
    padding: 18px;
    margin: 18px 0;
    background: var(--panel-strong);
    border-radius: 10px;
}

.backup-counts > div {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
}

.backup-counts dt {
    color: var(--muted);
    font-size: 14px;
}

.backup-counts dd {
    margin: 0;
    font-weight: 700;
    color: var(--accent-strong);
}

.backup-file-label {
    display: block;
    font-weight: 600;
    margin: 18px 0 10px;
}

#progressBackupFile, #backupConflictMode {
    max-width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--panel);
    color: var(--text);
}

#backupConflictMode {
    width: 100%;
}

.backup-preview {
    border: 1px solid var(--accent);
    border-radius: 10px;
    padding: 18px;
    margin: 22px 0;
    overflow-wrap: anywhere;
}

.content-panel .backup-preview h2 {
    padding: 0;
    margin: 0;
    border: 0;
}

.backup-confirm {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    line-height: 1.6;
}

.backup-confirm input {
    margin-top: 6px;
}

.backup-section button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}