:root {
    --mbti-ink: #20201f;
    --mbti-muted: #666762;
    --mbti-line: rgba(42, 43, 40, 0.14);
    --mbti-paper: #fffefb;
    --mbti-ground: #f3f1eb;
    --mbti-indigo: #414063;
    --mbti-indigo-soft: rgba(65, 64, 99, 0.08);
    --mbti-olive: #68705b;
    --mbti-gold: #a06c35;
    --mbti-rust: #9a5149;
}

.mbti-page {
    background:
        radial-gradient(circle at 50% 0, rgba(65, 64, 99, 0.07), transparent 34rem),
        var(--mbti-ground);
    color: var(--mbti-ink);
}

.skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 2000;
    padding: 0.65rem 0.9rem;
    border-radius: 0.4rem;
    background: #1f2937;
    color: #fff;
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.mbti-main {
    padding: 8rem 0 5rem;
}

.reading-shell {
    display: grid;
    grid-template-columns: 10.5rem minmax(0, 45rem);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    justify-content: center;
    width: min(calc(100% - 3rem), 70rem);
    margin: 0 auto;
}

.article-toc {
    position: sticky;
    top: 6.5rem;
    align-self: start;
    color: var(--mbti-muted);
    font-size: 0.82rem;
    line-height: 1.55;
}

.toc-label,
.section-kicker {
    margin: 0 0 0.9rem;
    color: var(--mbti-indigo);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.article-toc ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

.article-toc li + li {
    margin-top: 0.6rem;
}

.article-toc a {
    display: block;
    padding-left: 0.75rem;
    border-left: 2px solid var(--mbti-line);
    color: inherit;
    text-decoration: none;
}

.article-toc a:hover,
.article-toc a[aria-current="location"] {
    border-left-color: var(--mbti-indigo);
    color: var(--mbti-indigo);
}

.reading-column {
    min-width: 0;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--mbti-indigo);
    font-size: 0.92rem;
    font-weight: 650;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
    text-underline-offset: 0.22em;
}

.mobile-toc {
    display: none;
}

.post {
    color: var(--mbti-ink);
    font-size: 1.0625rem;
    line-height: 1.9;
    letter-spacing: 0.005em;
    text-wrap: pretty;
}

.post-header {
    margin-bottom: 3rem;
}

.eyebrow {
    margin: 0 0 0.75rem;
    color: var(--mbti-indigo);
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.post h1 {
    max-width: 16ch;
    margin: 0 0 1rem;
    color: var(--mbti-ink);
    font-size: clamp(2.125rem, 4vw, 2.8rem);
    font-weight: 720;
    line-height: 1.18;
    letter-spacing: -0.025em;
    text-wrap: balance;
}

.dek {
    max-width: 39rem;
    margin: 0 0 1.25rem;
    color: #454744;
    font-size: 1.12rem;
    line-height: 1.75;
}

.post-meta {
    margin: 0;
    color: var(--mbti-muted);
    font-size: 0.86rem;
    font-variant-numeric: tabular-nums;
}

.function-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1.5rem 0 0;
}

.function-row span {
    padding: 0.34rem 0.7rem;
    border: 1px solid rgba(65, 64, 99, 0.2);
    border-radius: 999px;
    background: var(--mbti-indigo-soft);
    color: var(--mbti-indigo);
    font-size: 0.76rem;
    font-weight: 620;
    line-height: 1.4;
}

.function-row b {
    font-weight: 800;
}

.post h2,
.post h3,
.post h4,
.post [id] {
    scroll-margin-top: 6.75rem;
}

.post h2 {
    margin: 3.5rem 0 1.15rem;
    color: var(--mbti-ink);
    font-size: 1.55rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.012em;
}

.post h3 {
    margin: 2.35rem 0 0.8rem;
    color: var(--mbti-ink);
    font-size: 1.18rem;
    font-weight: 680;
    line-height: 1.5;
}

.post p {
    margin: 0 0 1.05em;
}

.post :where(ul, ol) {
    margin: 0.65em 0 1.35em;
    padding-inline-start: 1.45em;
}

.post li + li {
    margin-top: 0.52em;
}

.post strong {
    color: #151515;
    font-weight: 680;
}

.post a {
    color: var(--mbti-indigo);
    overflow-wrap: anywhere;
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.18em;
}

.overview-card {
    margin: 2rem 0 3rem;
    padding: 1.4rem 1.5rem 1.5rem;
    border: 1px solid var(--mbti-line);
    border-left: 3px solid var(--mbti-indigo);
    border-radius: 0.55rem;
    background: rgba(255, 254, 251, 0.9);
}

.overview-card h2 {
    margin: 0 0 0.95rem;
    font-size: 1.28rem;
}

.overview-card p:last-child,
.source-note p:last-child {
    margin-bottom: 0;
}

.thesis-grid {
    display: grid;
    gap: 0.75rem;
    margin-top: 1.6rem;
}

.thesis-grid article {
    padding: 1rem 1.05rem;
    border: 1px solid var(--mbti-line);
    border-radius: 0.4rem;
    background: var(--mbti-paper);
}

.thesis-grid article > span {
    color: var(--mbti-gold);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.1em;
}

.thesis-grid h3 {
    margin: 0.32rem 0 0.38rem;
    font-size: 1rem;
}

.thesis-grid p {
    color: #4e504c;
    font-size: 0.9rem;
    line-height: 1.65;
}

.story-chapter {
    margin: 2rem 0;
    overflow: clip;
    border: 1px solid var(--mbti-line);
    border-radius: 0.7rem;
    background: var(--mbti-paper);
    box-shadow: 0 1px 2px rgba(26, 27, 25, 0.035);
}

.story-chapter > summary {
    position: relative;
    display: grid;
    grid-template-columns: 2.25rem 1fr;
    gap: 0 0.85rem;
    min-height: 5rem;
    padding: 1.25rem 3.5rem 1.25rem 1.5rem;
    cursor: pointer;
    list-style: none;
}

.story-chapter > summary::-webkit-details-marker,
.subchapter > summary::-webkit-details-marker,
.mobile-toc > summary::-webkit-details-marker {
    display: none;
}

.story-chapter > summary::after,
.subchapter > summary::after,
.mobile-toc > summary::after {
    content: "+";
    position: absolute;
    top: 50%;
    right: 1.35rem;
    color: var(--mbti-indigo);
    font-size: 1.35rem;
    font-weight: 400;
    line-height: 1;
    transform: translateY(-50%);
    transition: transform 160ms ease;
}

.story-chapter[open] > summary::after,
.subchapter[open] > summary::after,
.mobile-toc[open] > summary::after {
    transform: translateY(-50%) rotate(45deg);
}

.story-chapter[open] > summary {
    border-bottom: 1px solid var(--mbti-line);
    background: rgba(65, 64, 99, 0.045);
}

.chapter-number {
    grid-row: 1 / span 2;
    color: var(--mbti-indigo);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.chapter-title {
    color: var(--mbti-ink);
    font-size: 1.35rem;
    font-weight: 720;
    line-height: 1.35;
    letter-spacing: -0.012em;
}

.chapter-meta {
    margin-top: 0.2rem;
    color: var(--mbti-muted);
    font-size: 0.82rem;
    line-height: 1.5;
}

.story-chapter > .chapter-body {
    padding: 0.75rem 1.75rem 2.5rem;
}

.chapter-intro {
    margin: 1.25rem 0 2.25rem;
    color: #50524f;
    font-size: 0.95rem;
}

.dimension-grid,
.shadow-grid,
.function-stack,
.practical-spread {
    display: grid;
    gap: 0.8rem;
}

.dimension-grid article,
.shadow-grid article {
    padding: 1rem 1.05rem;
    border: 1px solid var(--mbti-line);
    border-radius: 0.45rem;
    background: #faf9f5;
}

.dimension-grid b,
.shadow-grid b {
    color: var(--mbti-indigo);
    font-size: 0.92rem;
}

.dimension-grid p,
.shadow-grid p {
    margin: 0.45rem 0 0;
    color: #4b4d49;
    font-size: 0.93rem;
    line-height: 1.72;
}

.dense-list {
    padding-inline-start: 1.25rem !important;
}

.dense-list li {
    padding-left: 0.3rem;
}

.pull-quote {
    margin: 2.25rem 0;
    padding: 0.15rem 0 0.15rem 1.35rem;
    border-left: 3px solid var(--mbti-indigo);
    color: var(--mbti-indigo);
    font-size: 1.2rem;
    font-weight: 620;
    line-height: 1.65;
}

.example-band {
    margin: 2.5rem 0 0;
    padding: 1.4rem 1.5rem;
    border-top: 1px solid var(--mbti-line);
    border-bottom: 1px solid var(--mbti-line);
    background: #faf9f5;
}

.example-band p:not(.section-kicker) {
    font-size: 1.06rem;
    font-weight: 630;
}

.example-band ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-bottom: 0;
    padding: 0;
    list-style: none;
}

.example-band li {
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--mbti-line);
    border-radius: 999px;
    background: var(--mbti-paper);
    color: #494b47;
    font-size: 0.82rem;
}

.function-card {
    padding: 1.35rem 1.4rem;
    border: 1px solid var(--mbti-line);
    border-top: 4px solid var(--mbti-indigo);
    border-radius: 0.35rem;
    background: #fbfaf7;
}

.function-card--te {
    border-top-color: var(--mbti-olive);
}

.function-card--fi {
    border-top-color: var(--mbti-rust);
}

.function-card--se {
    border-top-color: var(--mbti-gold);
}

.function-code {
    margin: 0 !important;
    color: var(--mbti-muted);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.function-card h2 {
    margin: 0.45rem 0 0.8rem;
    font-size: 1.2rem;
}

.function-card p {
    color: #4b4d49;
    font-size: 0.94rem;
    line-height: 1.75;
}

.risk-line {
    margin-top: 1.2rem !important;
    padding-top: 0.9rem;
    border-top: 1px solid var(--mbti-line);
}

.subchapter {
    margin: 2rem 0 0;
    border: 0;
    border-top: 1px solid var(--mbti-line);
}

.subchapter > summary {
    position: relative;
    min-height: 3rem;
    padding: 1rem 2.5rem 1rem 0;
    color: var(--mbti-ink);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 680;
    line-height: 1.5;
    list-style: none;
}

.subchapter > summary::after {
    right: 0.25rem;
    font-size: 1.1rem;
}

.subchapter > .detail-body {
    margin: 0.25rem 0 1.75rem;
    padding-left: 1.25rem;
    border-left: 2px solid var(--mbti-line);
}

.timeline-list li {
    padding-left: 0.25rem;
}

.source-note {
    margin: 1.5rem 0;
    padding: 1rem 1.15rem;
    border-left: 3px solid #8b8c87;
    border-radius: 0.35rem;
    background: #f2f1ed;
    color: #4e504c;
    font-size: 0.9rem;
    line-height: 1.75;
}

.practical-spread > section {
    padding: 1.35rem 1.4rem;
    border: 1px solid var(--mbti-line);
    border-radius: 0.4rem;
    background: #faf9f5;
}

.practical-spread h2 {
    margin-top: 0;
}

.history-line {
    display: grid;
    gap: 0.65rem;
    margin: 1.75rem 0 2.5rem;
}

.history-line > div {
    display: grid;
    grid-template-columns: 7rem 4.5rem 1fr;
    gap: 0.75rem;
    align-items: baseline;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--mbti-line);
}

.history-line time {
    color: var(--mbti-muted);
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
}

.history-line strong {
    color: var(--mbti-indigo);
    font-size: 1.05rem;
}

.history-line span {
    color: var(--mbti-muted);
    font-size: 0.88rem;
}

.read-next {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: 100%;
    margin: 3rem 0 0;
    padding: 1rem 1.15rem;
    border: 1px solid rgba(65, 64, 99, 0.25);
    border-radius: 0.5rem;
    background: var(--mbti-indigo-soft);
    color: var(--mbti-indigo);
    cursor: pointer;
    font: inherit;
    font-weight: 680;
    text-align: left;
}

.read-next:hover {
    border-color: var(--mbti-indigo);
    background: rgba(65, 64, 99, 0.12);
}

.read-next span:last-child {
    font-size: 1.2rem;
}

.end-note {
    margin: 3.25rem 0 0;
    padding-top: 1.5rem;
    border-top: 1px solid var(--mbti-line);
    color: var(--mbti-muted);
    font-size: 0.88rem;
}

.post :where(a, summary, button):focus-visible {
    border-radius: 0.3rem;
    outline: 3px solid rgba(65, 64, 99, 0.3);
    outline-offset: 4px;
}

@media (min-width: 1280px) {
    .mbti-page {
        background:
            radial-gradient(circle at 50% -8rem, rgba(65, 64, 99, 0.12), transparent 42rem),
            linear-gradient(90deg, #eeece5 0, #f8f7f2 50%, #eeece5 100%);
    }

    .mbti-main {
        padding: 7.5rem 0 6rem;
    }

    .reading-shell {
        grid-template-columns: 10.75rem minmax(0, 1fr);
        gap: clamp(2.5rem, 3.5vw, 3.75rem);
        width: min(calc(100% - 4rem), 94rem);
    }

    .article-toc {
        top: 7rem;
        font-size: 0.84rem;
    }

    .reading-column {
        padding: 2.25rem clamp(2.75rem, 4vw, 4.25rem) 4rem;
        border: 1px solid rgba(42, 43, 40, 0.13);
        border-radius: 0.18rem;
        background: var(--mbti-paper);
        box-shadow:
            0 2.2rem 5rem rgba(35, 34, 31, 0.1),
            0 0.25rem 0.8rem rgba(35, 34, 31, 0.04);
    }

    .post {
        font-size: 1.075rem;
        line-height: 1.92;
    }

    .book-spread--header {
        position: relative;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: clamp(4rem, 6vw, 6rem);
        align-items: start;
        min-height: 23rem;
        margin: 0 -0.5rem 3.5rem;
        padding: 2.25rem 0.5rem 2.8rem;
        border-bottom: 1px solid var(--mbti-line);
    }

    .book-spread--header::after {
        content: "";
        position: absolute;
        top: 2rem;
        bottom: 2.75rem;
        left: 50%;
        width: 1px;
        background: linear-gradient(transparent, rgba(42, 43, 40, 0.23) 12%, rgba(42, 43, 40, 0.23) 88%, transparent);
        box-shadow: 0 0 1.25rem rgba(35, 34, 31, 0.1);
    }

    .book-page--title,
    .book-page--dek {
        min-width: 0;
    }

    .book-page--title {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        min-height: 17rem;
    }

    .post h1 {
        max-width: 13ch;
        margin: 0;
        font-size: clamp(2.8rem, 3.5vw, 3.75rem);
        line-height: 1.13;
    }

    .book-page--dek {
        align-self: end;
        padding-bottom: 0.35rem;
    }

    .dek {
        max-width: 31rem;
        margin: 0 0 1.5rem;
        color: #383a37;
        font-size: 1.2rem;
        line-height: 1.82;
    }

    .overview-card {
        margin: 0 0 3.5rem;
        padding: 2rem 2.25rem 2.1rem;
        border-left-width: 1px;
        border-radius: 0.18rem;
        background: #f7f5ef;
    }

    .overview-grid {
        position: relative;
        display: grid;
        grid-template-columns: 0.72fr 1.28fr;
        gap: clamp(3rem, 5vw, 5rem);
    }

    .overview-grid::after {
        content: "";
        position: absolute;
        top: 0;
        bottom: 0;
        left: calc(36% + 0.5 * clamp(3rem, 5vw, 5rem));
        width: 1px;
        background: var(--mbti-line);
    }

    .overview-card h2 {
        max-width: 13ch;
        font-size: 1.8rem;
        line-height: 1.35;
    }

    .thesis-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.8rem;
        margin-top: 2rem;
        padding-top: 1.5rem;
        border-top: 1px solid var(--mbti-line);
    }

    .story-chapter {
        margin: 2.75rem 0;
        border-radius: 0.2rem;
        box-shadow: 0 0.75rem 2rem rgba(35, 34, 31, 0.035);
    }

    .story-chapter > summary {
        min-height: 6rem;
        padding: 1.55rem 4rem 1.55rem 2rem;
    }

    .chapter-title {
        font-size: 1.5rem;
    }

    .story-chapter > .chapter-body {
        padding: 1rem clamp(2.25rem, 3.6vw, 3.75rem) 3.5rem;
    }

    .chapter-prose,
    .chapter-body > .chapter-intro,
    .chapter-body > .subchapter {
        width: min(100%, 50rem);
        margin-inline: auto;
    }

    .chapter-intro {
        margin-block: 1.75rem 2.75rem;
        font-size: 1rem;
    }

    .book-spread--two {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        column-gap: clamp(2.5rem, 4vw, 4.25rem);
        row-gap: 1rem;
        margin: 2.75rem 0 3.25rem;
        padding: 2.25rem 0 1.5rem;
        border-top: 1px solid var(--mbti-line);
        border-bottom: 1px solid var(--mbti-line);
    }

    .book-spread--two > * {
        break-inside: avoid;
    }

    .function-stack {
        position: relative;
    }

    .function-stack::after,
    .shadow-grid::after,
    .practical-spread::after {
        content: "";
        position: absolute;
        top: 2.25rem;
        bottom: 1.5rem;
        left: 50%;
        width: 1px;
        background: var(--mbti-line);
        pointer-events: none;
    }

    .shadow-grid,
    .practical-spread {
        position: relative;
    }

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

    .history-line {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0;
        border-top: 1px solid var(--mbti-line);
        border-bottom: 1px solid var(--mbti-line);
    }

    .history-line > div {
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
        padding: 1.2rem 1.25rem;
        border-right: 1px solid var(--mbti-line);
        border-bottom: 0;
    }

    .history-line > div:last-child {
        border-right: 0;
    }
}

@media (max-width: 1024px) {
    .reading-shell {
        display: block;
        width: min(calc(100% - 2.5rem), 45rem);
    }

    .article-toc {
        display: none;
    }

    .mobile-toc {
        display: block;
        margin: 0 0 2rem;
        border: 1px solid var(--mbti-line);
        border-radius: 0.5rem;
        background: rgba(255, 254, 251, 0.9);
    }

    .mobile-toc > summary {
        position: relative;
        min-height: 2.75rem;
        padding: 0.7rem 2.75rem 0.7rem 0.9rem;
        cursor: pointer;
        color: var(--mbti-ink);
        font-size: 0.86rem;
        font-weight: 680;
        list-style: none;
    }

    .mobile-toc > summary::after {
        right: 0.9rem;
        font-size: 1rem;
    }

    .mobile-toc ol {
        margin: 0;
        padding: 0 1rem 1rem 2.2rem;
    }

    .mobile-toc li + li {
        margin-top: 0.35rem;
    }

    .mobile-toc a {
        font-size: 0.86rem;
    }
}

@media (max-width: 768px) {
    .mbti-main {
        padding: 6.75rem 0 3.5rem;
    }

    .reading-shell {
        width: min(calc(100% - 2.25rem), 45rem);
    }

    .post {
        font-size: 1rem;
        line-height: 1.86;
    }

    .post h1 {
        font-size: clamp(1.95rem, 9vw, 2.25rem);
    }

    .dek {
        font-size: 1.03rem;
        line-height: 1.72;
    }

    .post h2 {
        margin-top: 3rem;
        font-size: 1.35rem;
    }

    .overview-card {
        padding: 1.15rem;
    }

    .story-chapter > summary {
        grid-template-columns: 1.75rem 1fr;
        gap: 0 0.5rem;
        padding: 1rem 3rem 1rem 1rem;
    }

    .chapter-title {
        font-size: 1.18rem;
    }

    .story-chapter > .chapter-body {
        padding: 0.5rem 1rem 1.85rem;
    }

    .subchapter > .detail-body {
        padding-left: 0.9rem;
    }

    .pull-quote {
        font-size: 1.06rem;
    }

    .history-line > div {
        grid-template-columns: 6.25rem 4rem 1fr;
    }
}

@media (max-width: 380px) {
    .reading-shell {
        width: min(calc(100% - 1.75rem), 45rem);
    }

    .story-chapter > summary {
        padding-left: 0.85rem;
    }

    .history-line > div {
        grid-template-columns: 1fr;
        gap: 0.15rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .post *,
    .post *::before,
    .post *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

@media print {
    @page {
        margin: 18mm;
    }

    .navbar,
    .footer,
    .skip-link,
    .back-link,
    .article-toc,
    .mobile-toc,
    .read-next {
        display: none !important;
    }

    .mbti-main {
        padding: 0;
    }

    .reading-shell {
        display: block;
        width: auto;
        max-width: none;
    }

    .reading-column {
        padding: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
    }

    .post {
        color: #000;
        font-size: 11.5pt;
        line-height: 1.65;
    }

    .book-spread--header,
    .book-spread--two,
    .overview-grid,
    .thesis-grid {
        display: block;
        min-height: 0;
        padding: 0;
        border: 0;
    }

    .book-spread--header::after,
    .overview-grid::after,
    .function-stack::after,
    .shadow-grid::after,
    .practical-spread::after {
        display: none;
    }

    .story-chapter,
    .story-chapter > summary {
        border: 0;
        box-shadow: none;
    }

    .story-chapter > summary {
        padding-inline: 0;
    }

    .story-chapter > summary::after,
    .subchapter > summary::after {
        display: none;
    }

    .story-chapter > .chapter-body {
        padding-inline: 0;
    }

    details:not([open]) > :not(summary) {
        display: block !important;
    }

    h2,
    h3,
    summary,
    .function-card,
    blockquote {
        break-after: avoid;
        break-inside: avoid;
    }
}