.tutorial-shell {
    display: grid;
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr) minmax(180px, 220px);
    gap: 28px;
    width: min(1280px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 72px;
}

.tutorial-sidebar {
    position: sticky;
    top: 86px;
    align-self: start;
    max-height: calc(100vh - 106px);
    overflow: auto;
    border-right: 1px solid var(--line);
    padding: 0 18px 24px 0;
}

.tutorial-sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.tutorial-sidebar__title {
    color: var(--ink);
    font-size: 1.05rem;
    font-weight: 850;
    text-decoration: none;
}

.tutorial-sidebar__close,
.tutorial-menu-toggle {
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink);
    cursor: pointer;
}

.tutorial-sidebar__close {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 999px;
    font-size: 1.5rem;
    line-height: 1;
}

.tutorial-menu-toggle {
    display: none;
    position: sticky;
    top: 84px;
    z-index: 30;
    align-items: center;
    gap: 9px;
    width: max-content;
    border-radius: 999px;
    font: inherit;
    font-weight: 850;
    padding: 9px 13px;
    box-shadow: var(--shadow);
}

.tutorial-menu-toggle__lines {
    position: relative;
    display: block;
    width: 18px;
    height: 14px;
}

.tutorial-menu-toggle__lines span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
}

.tutorial-menu-toggle__lines span:nth-child(1) {
    top: 0;
}

.tutorial-menu-toggle__lines span:nth-child(2) {
    top: 6px;
}

.tutorial-menu-toggle__lines span:nth-child(3) {
    bottom: 0;
}

.tutorial-group {
    border-bottom: 1px solid color-mix(in srgb, var(--line), transparent 30%);
    padding: 8px 0;
}

.tutorial-group summary {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
    cursor: pointer;
    font-weight: 850;
    list-style: none;
    padding: 8px 4px;
}

.tutorial-group summary::-webkit-details-marker {
    display: none;
}

.tutorial-group summary::after {
    content: "+";
    margin-left: auto;
    color: var(--muted);
}

.tutorial-group[open] summary::after {
    content: "-";
}

.tutorial-group__icon,
.tutorial-category-card__icon {
    display: inline-grid;
    place-items: center;
    border-radius: 8px;
    background: var(--surface-soft);
    color: var(--primary);
}

.tutorial-group__icon svg,
.tutorial-category-card__icon svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2;
}

.tutorial-category-card__icon svg {
    width: 22px;
    height: 22px;
}

.tutorial-group__icon {
    width: 30px;
    height: 30px;
}

.tutorial-group ol {
    display: grid;
    gap: 4px;
    margin: 4px 0 6px;
    padding: 0 0 0 10px;
    list-style: none;
}

.python-roadmap,
.linux-roadmap,
.go-roadmap {
    max-height: 58vh;
    overflow-y: auto;
    gap: 2px !important;
    padding-right: 4px !important;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--primary), transparent 60%) transparent;
}

.tutorial-group .tutorial-stage-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-top: 10px;
    padding: 8px 7px 4px;
    color: var(--ink);
    font-size: 0.74rem;
    font-weight: 900;
    letter-spacing: 0.035em;
    text-transform: uppercase;
}

.tutorial-stage-label.is-upcoming {
    color: var(--muted);
}

.tutorial-stage-label.is-upcoming > span {
    border-radius: 999px;
    background: var(--surface-soft);
    padding: 2px 6px;
    font-size: 0.62rem;
}

.tutorial-upcoming-lesson {
    padding: 4px 8px 4px 32px;
    color: color-mix(in srgb, var(--muted), transparent 25%);
    font-size: 0.8rem;
}

.tutorial-stage-accordion {
    min-width: 0;
}

.tutorial-group .tutorial-stage {
    border: 0;
    border-bottom: 1px solid color-mix(in srgb, var(--line), transparent 18%);
    border-radius: 0;
    background: transparent;
    overflow: hidden;
    transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.tutorial-group .tutorial-stage:hover {
    border-color: var(--line);
}

.tutorial-group .tutorial-stage > summary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    min-height: 42px;
    gap: 8px;
    padding: 8px 4px;
    color: var(--ink);
    font-size: 0.8rem;
    line-height: 1.25;
    text-transform: none;
}

.tutorial-group .tutorial-stage > summary::after {
    content: "›";
    align-self: center;
    color: var(--muted);
    font-size: 1.25rem;
    line-height: 1;
    transform: rotate(0deg);
    transition: transform 160ms ease, color 160ms ease;
}

.tutorial-group .tutorial-stage[open] > summary::after {
    content: "›";
    color: var(--primary);
    transform: rotate(90deg);
}

.tutorial-group .tutorial-stage[open] > summary {
    border-bottom: 0;
    background: transparent;
    color: var(--primary);
}

.tutorial-group .tutorial-stage[open] {
    border-color: var(--line);
    box-shadow: none;
}

.tutorial-stage-title {
    align-self: center;
    min-width: 0;
    font-weight: 850;
}

.tutorial-stage-count {
    display: none;
}

.tutorial-stage[open] .tutorial-stage-count {
    border-color: color-mix(in srgb, var(--primary), transparent 72%);
    background: var(--surface);
    color: var(--primary);
}

.tutorial-group .tutorial-stage-lessons {
    max-height: none;
    margin: 0;
    gap: 3px;
    background: transparent;
    padding: 2px 0 9px !important;
}

.tutorial-stage-lessons a {
    padding: 8px 9px;
    font-size: 0.86rem;
}

.tutorial-stage-lessons a > span:first-child {
    display: inline-grid;
    width: 23px;
    height: 23px;
    place-items: center;
    border-radius: 0;
    background: transparent;
    font-size: 0.7rem;
    font-weight: 900;
}

.tutorial-stage-lessons a[aria-current="page"] {
    box-shadow: inset 2px 0 0 var(--primary);
}

.tutorial-stage-lessons a[aria-current="page"] > span:first-child {
    background: transparent;
    color: var(--primary);
}

.tutorial-group a {
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 8px;
    align-items: center;
    border-radius: 8px;
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 750;
    padding: 7px 8px;
    text-decoration: none;
}

.tutorial-group a:hover,
.tutorial-group a[aria-current="page"] {
    background: color-mix(in srgb, var(--primary), transparent 90%);
    color: var(--primary);
}

.tutorial-content {
    min-width: 0;
    color: var(--text);
}

.tutorial-kicker {
    margin: 0 0 10px;
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.tutorial-content h1 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(2.15rem, 4vw, 3.6rem);
    line-height: 1.05;
}

.tutorial-content .lead {
    max-width: 760px;
    margin: 18px 0 30px;
    color: var(--muted);
    font-size: 1.1rem;
}

.tutorial-content article {
    max-width: 780px;
}

.tutorial-content article h2,
.tutorial-content article h3 {
    color: var(--ink);
    line-height: 1.18;
}

.tutorial-content article h2 {
    margin: 34px 0 12px;
    font-size: 1.55rem;
}

.tutorial-content article h3 {
    margin: 26px 0 10px;
    font-size: 1.2rem;
}

.tutorial-content article p,
.tutorial-content article li {
    font-size: 1rem;
    line-height: 1.75;
}

.beginner-definition,
.why-matters,
.beginner-mistakes {
    margin: 22px 0;
    border-radius: 10px;
    padding: 17px 19px;
}

.beginner-definition {
    border: 1px solid color-mix(in srgb, var(--primary), transparent 68%);
    background: color-mix(in srgb, var(--primary), transparent 94%);
}

.why-matters {
    border-left: 4px solid var(--accent);
    background: color-mix(in srgb, var(--accent), transparent 92%);
}

.beginner-mistakes {
    border-left: 4px solid var(--accent-rose);
    background: color-mix(in srgb, var(--accent-rose), transparent 94%);
}

.beginner-definition > strong,
.why-matters > strong,
.beginner-mistakes > strong,
.code-explanation > strong {
    color: var(--ink);
}

.beginner-definition p,
.why-matters p {
    margin: 7px 0 0;
}

.beginner-mistakes ul,
.code-explanation ol {
    margin-bottom: 0;
}

.code-explanation {
    margin: -10px 0 24px;
    border: 1px solid var(--line);
    border-top: 0;
    border-radius: 0 0 10px 10px;
    background: var(--surface-soft);
    padding: 16px 18px;
}

.lesson-exercise {
    margin-top: 34px;
    border-top: 1px solid var(--line);
    padding-top: 4px;
}

.exercise-hints,
.exercise-solution {
    margin: 12px 0;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
}

.exercise-hints summary,
.exercise-solution summary {
    cursor: pointer;
    color: var(--ink);
    font-weight: 850;
    padding: 13px 16px;
}

.exercise-hints[open],
.exercise-solution[open] {
    padding-bottom: 14px;
}

.exercise-hints ol,
.exercise-solution > :not(summary) {
    margin-left: 18px;
    margin-right: 18px;
}

.starter-scenario,
.expected-output {
    margin: 16px 0;
    border-radius: 10px;
    background: var(--surface-soft);
    padding: 15px 17px;
}

.starter-scenario p,
.expected-output p {
    margin: 7px 0 0;
}

.expected-output {
    border-left: 4px solid color-mix(in srgb, var(--primary), var(--accent) 34%);
}

.expected-output pre {
    margin: 10px 0 8px;
    border-radius: 8px;
}

.command-example > p:first-child {
    margin-bottom: 8px;
    color: var(--ink);
}

.tutorial-content blockquote {
    margin: 24px 0;
    border-left: 4px solid var(--primary);
    border-radius: 8px;
    background: var(--surface-soft);
    color: var(--ink);
    padding: 14px 18px;
}

.tutorial-content pre {
    position: relative;
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #071a35;
    color: #f8fbff;
    padding: 18px;
}

.tutorial-content code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.tutorial-content :not(pre) > code {
    border-radius: 6px;
    background: var(--surface-soft);
    color: var(--ink);
    padding: 0.16em 0.36em;
}

.code-copy {
    position: absolute;
    top: 10px;
    right: 10px;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    cursor: pointer;
    font: inherit;
    font-size: 0.78rem;
    font-weight: 850;
    padding: 5px 9px;
}

.tutorial-category-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    max-width: 820px;
}

.tutorial-category-card {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text);
    padding: 18px;
    text-decoration: none;
    box-shadow: var(--shadow);
    transition: transform 160ms ease, border-color 160ms ease;
}

.tutorial-category-card:hover {
    border-color: color-mix(in srgb, var(--primary), transparent 55%);
    transform: translateY(-2px);
}

.tutorial-category-card__icon {
    width: 44px;
    height: 44px;
}

.tutorial-category-card strong,
.tutorial-category-card span span,
.tutorial-category-card em {
    display: block;
}

.tutorial-category-card strong {
    color: var(--ink);
    font-size: 1.08rem;
    line-height: 1.2;
}

.tutorial-category-card span span {
    margin-top: 7px;
    color: var(--muted);
    line-height: 1.5;
}

.tutorial-category-card em {
    margin-top: 12px;
    color: var(--primary);
    font-style: normal;
    font-weight: 850;
}

.tutorial-pager {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    max-width: 780px;
    margin-top: 36px;
}

.tutorial-pager__link {
    position: relative;
    display: grid;
    min-height: 74px;
    align-content: center;
    border: 1px solid color-mix(in srgb, var(--primary), transparent 58%);
    border-radius: 9px;
    background: var(--surface);
    color: var(--text);
    padding: 12px 14px 12px 50px;
    text-decoration: none;
    box-shadow: 0 6px 16px rgba(30, 64, 175, 0.07);
    transition: border-color 160ms ease, background 160ms ease;
}

.tutorial-pager__link::before {
    content: "‹";
    position: absolute;
    left: 13px;
    top: 50%;
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--primary), transparent 86%);
    color: var(--primary);
    font-size: 1.2rem;
    font-weight: 850;
    line-height: 1;
    transform: translateY(-50%);
}

.tutorial-pager__link:hover {
    border-color: var(--primary);
    background: var(--surface-soft);
}

.tutorial-pager__link:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 3px;
}

.tutorial-pager__link--next {
    padding: 12px 50px 12px 14px;
    text-align: right;
}

.tutorial-pager__link--next::before {
    content: "›";
    right: 13px;
    left: auto;
}

.tutorial-pager__link span {
    display: block;
    color: var(--muted);
    font-size: 0.7rem;
    font-weight: 850;
    letter-spacing: 0.05em;
    line-height: 1.2;
    text-transform: uppercase;
}

.tutorial-pager__link strong {
    display: block;
    margin-top: 3px;
    color: var(--ink);
    font-size: 0.96rem;
    font-weight: 850;
    line-height: 1.3;
}

.tutorial-toc {
    position: sticky;
    top: 86px;
    align-self: start;
    max-height: calc(100vh - 106px);
    overflow: auto;
    border-left: 1px solid var(--line);
    padding-left: 18px;
}

.tutorial-toc p {
    margin: 0 0 10px;
    color: var(--ink);
    font-size: 0.84rem;
    font-weight: 850;
    text-transform: uppercase;
}

.tutorial-toc ol {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.tutorial-toc a {
    color: var(--muted);
    font-size: 0.9rem;
    text-decoration: none;
}

.tutorial-toc .depth-3 {
    padding-left: 12px;
}

.tutorial-overlay {
    display: none;
}

@media (max-width: 1080px) {
    .tutorial-shell {
        grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
    }

    .tutorial-toc {
        display: none;
    }
}

@media (max-width: 820px) {
    .tutorial-shell {
        display: block;
        width: min(100% - 32px, 780px);
    }

    .tutorial-menu-toggle {
        display: inline-flex;
        margin-bottom: 22px;
    }

    .tutorial-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 90;
        width: min(86vw, 340px);
        max-height: none;
        border-right: 1px solid var(--line);
        background: var(--surface);
        box-shadow: var(--shadow-hover);
        padding: 18px;
        transform: translateX(-104%);
        transition: transform 180ms ease;
    }

    .tutorial-shell[data-menu-open] .tutorial-sidebar {
        transform: translateX(0);
    }

    .tutorial-sidebar__close {
        display: inline-grid;
        place-items: center;
    }

    .tutorial-overlay {
        position: fixed;
        inset: 0;
        z-index: 80;
        display: block;
        background: rgba(7, 26, 53, 0.46);
        opacity: 0;
        pointer-events: none;
        transition: opacity 180ms ease;
    }

    .tutorial-shell[data-menu-open] .tutorial-overlay {
        opacity: 1;
        pointer-events: auto;
    }

    .tutorial-pager,
    .tutorial-category-grid {
        grid-template-columns: 1fr;
    }

    .tutorial-pager__link--next {
        text-align: left;
    }

    .tutorial-pager__link--next::before {
        right: auto;
        left: 14px;
    }

    .tutorial-pager__link,
    .tutorial-pager__link--next {
        min-height: 70px;
        padding: 11px 13px 11px 48px;
    }

    .tutorial-pager {
        gap: 12px;
        margin-top: 32px;
    }
}