:root {
    --note-ink: #202925;
    --note-muted: #65706a;
    --note-paper: #fffdf8;
    --note-canvas: #ecefe9;
    --note-line: rgba(32, 41, 37, 0.15);
    --note-accent: #355f52;
    --note-accent-soft: #e3ece6;
    --note-warm: #9a5a43;
    --note-blue: #476b7b;
}

.field-note-page--market {
    --note-accent: #7a3f32;
    --note-accent-soft: #f2e6df;
    --note-warm: #a65f35;
}

.field-note-page--ai {
    --note-accent: #315e69;
    --note-accent-soft: #e2ecee;
    --note-warm: #8b6a37;
}

.field-note-page--life {
    --note-accent: #52643f;
    --note-accent-soft: #e8eee1;
    --note-warm: #8f6048;
}

html {
    scroll-behavior: smooth;
}

.field-note-page {
    margin: 0;
    color: var(--note-ink);
    background:
        linear-gradient(90deg, transparent calc(50% - 1px), rgba(32, 41, 37, 0.025) 50%, transparent calc(50% + 1px)),
        var(--note-canvas);
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.field-note-page .navbar {
    background: rgba(255, 253, 248, 0.94);
    border-bottom: 1px solid var(--note-line);
    backdrop-filter: blur(16px);
}

.field-note-page .navbar a {
    color: var(--note-ink);
}

.skip-link {
    position: fixed;
    z-index: 1000;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.65rem 0.9rem;
    background: var(--note-ink);
    color: #fff;
    transform: translateY(-160%);
}

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

.field-note-main {
    padding: 8.5rem 1.25rem 5rem;
}

.reading-shell {
    display: grid;
    grid-template-columns: 12.5rem minmax(0, 70rem);
    gap: 2rem;
    justify-content: center;
    align-items: start;
}

.article-toc {
    position: sticky;
    top: 7rem;
    padding: 1.1rem 0.25rem;
    border-top: 2px solid var(--note-accent);
    color: var(--note-muted);
}

.toc-label,
.section-kicker,
.eyebrow,
.chapter-number,
.category-label {
    margin: 0;
    color: var(--note-accent);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.article-toc ol,
.mobile-toc ol {
    margin: 0.7rem 0 0;
    padding: 0;
    list-style: none;
}

.article-toc li + li,
.mobile-toc li + li {
    margin-top: 0.15rem;
}

.article-toc a,
.mobile-toc a {
    display: block;
    padding: 0.45rem 0;
    color: inherit;
    font-size: 0.82rem;
    line-height: 1.45;
    text-decoration: none;
}

.article-toc a:hover,
.article-toc a:focus-visible,
.article-toc a[aria-current="location"] {
    color: var(--note-accent);
}

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

.back-link {
    display: inline-block;
    margin: 0 0 1rem;
    color: var(--note-accent);
    font-size: 0.86rem;
    font-weight: 700;
    text-decoration: none;
}

.mobile-toc {
    display: none;
}

.post {
    overflow: hidden;
    border: 1px solid var(--note-line);
    border-radius: 0.35rem;
    background: var(--note-paper);
    box-shadow: 0 1.4rem 4rem rgba(32, 41, 37, 0.09);
}

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

.post-header {
    position: relative;
    min-height: 31rem;
    border-bottom: 1px solid var(--note-line);
    background:
        repeating-linear-gradient(180deg, transparent 0 31px, rgba(32, 41, 37, 0.045) 31px 32px),
        linear-gradient(140deg, #fffefb, var(--note-accent-soft));
}

.post-header::after {
    content: "";
    position: absolute;
    inset: 0 auto 0 50%;
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(32, 41, 37, 0.18), transparent);
}

.book-page {
    display: flex;
    min-width: 0;
    padding: clamp(2rem, 5vw, 4.5rem);
    flex-direction: column;
    justify-content: center;
}

.book-page--title h1 {
    margin: 1.25rem 0 0;
    color: var(--note-ink);
    font-family: ui-serif, "Songti SC", "STSong", "Iowan Old Style", serif;
    font-size: clamp(2.8rem, 5.3vw, 5rem);
    font-weight: 650;
    line-height: 1.03;
    letter-spacing: -0.045em;
}

.title-note {
    margin: 1rem 0 0;
    color: var(--note-accent);
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: 1.1rem;
}

.book-page--dek {
    color: #3e4944;
}

.dek {
    margin: 0;
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: clamp(1.15rem, 2vw, 1.45rem);
    line-height: 1.85;
}

.post-meta {
    margin: 1.4rem 0 0;
    color: var(--note-muted);
    font-size: 0.78rem;
    line-height: 1.7;
}

.principle-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 1.8rem;
}

.principle-row span {
    padding: 0.35rem 0.65rem;
    border: 1px solid color-mix(in srgb, var(--note-accent) 25%, transparent);
    border-radius: 999px;
    color: var(--note-accent);
    font-size: 0.74rem;
    font-weight: 750;
}

.overview-card,
.source-note,
.article-end {
    padding: clamp(2rem, 5vw, 4.5rem);
}

.overview-card {
    border-bottom: 1px solid var(--note-line);
}

.overview-grid {
    display: grid;
    grid-template-columns: minmax(12rem, 0.72fr) minmax(0, 1.28fr);
    gap: 2.5rem;
}

.overview-grid h2 {
    margin: 0.65rem 0 0;
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: clamp(1.9rem, 4vw, 3rem);
    line-height: 1.18;
}

.overview-grid p,
.chapter-prose p,
.chapter-prose li,
.source-note p,
.source-note li,
.article-end p {
    font-size: 1rem;
    line-height: 1.9;
}

.overview-grid p:first-child {
    margin-top: 0;
}

.thesis-grid,
.risk-grid,
.systems-grid,
.motive-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    margin-top: 2.5rem;
}

.thesis-grid article,
.risk-grid article,
.systems-grid article,
.motive-grid article {
    padding: 1.2rem 1.25rem;
    border: 1px solid var(--note-line);
    border-radius: 0.35rem;
    background: rgba(255, 255, 255, 0.68);
}

.thesis-grid h3,
.risk-grid h3,
.systems-grid h3,
.motive-grid h3 {
    margin: 0.45rem 0 0.55rem;
    color: var(--note-ink);
    font-size: 1.02rem;
}

.thesis-grid p,
.risk-grid p,
.systems-grid p,
.motive-grid p {
    margin: 0;
    color: var(--note-muted);
    font-size: 0.88rem;
    line-height: 1.75;
}

.story-chapter {
    margin: 0;
    border: 0;
    border-bottom: 1px solid var(--note-line);
}

.story-chapter > summary,
.mobile-toc > summary {
    position: relative;
    display: grid;
    grid-template-columns: 2rem minmax(0, 1fr);
    min-height: 6rem;
    padding: 1.45rem 4.3rem 1.45rem clamp(1.4rem, 4vw, 3.2rem);
    cursor: pointer;
    list-style: none;
}

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

.story-chapter > summary::after,
.mobile-toc > summary::after {
    content: "+";
    position: absolute;
    top: 50%;
    right: 1.7rem;
    color: var(--note-accent);
    font-size: 1.35rem;
    transform: translateY(-50%);
    transition: transform 160ms ease;
}

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

.story-chapter[open] > summary {
    background: var(--note-accent-soft);
}

.chapter-title {
    color: var(--note-ink);
    font-size: 1.32rem;
    font-weight: 760;
    line-height: 1.35;
}

.chapter-meta {
    grid-column: 2;
    margin-top: 0.25rem;
    color: var(--note-muted);
    font-size: 0.78rem;
    line-height: 1.5;
}

.chapter-body {
    padding: 1rem clamp(1.4rem, 5vw, 4.5rem) 3.8rem;
}

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

.chapter-intro {
    margin: 1.2rem 0 2.2rem;
    color: var(--note-muted);
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: 1.12rem !important;
}

.chapter-prose h2 {
    margin: 3rem 0 1rem;
    color: var(--note-ink);
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: 1.55rem;
    line-height: 1.4;
}

.chapter-prose h3 {
    margin: 2.2rem 0 0.65rem;
    color: var(--note-accent);
    font-size: 1.02rem;
}

.chapter-prose ul,
.chapter-prose ol,
.source-note ul {
    padding-left: 1.35rem;
}

.chapter-prose li + li,
.source-note li + li {
    margin-top: 0.6rem;
}

.pull-quote {
    margin: 2.7rem 0;
    padding: 0.4rem 0 0.4rem 1.5rem;
    border-left: 4px solid var(--note-accent);
    color: var(--note-accent);
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: clamp(1.35rem, 3vw, 2rem);
    font-weight: 620;
    line-height: 1.65;
}

.note-card,
.boundary-note,
.version-note {
    margin: 2rem 0;
    padding: 1.1rem 1.25rem;
    border: 1px solid var(--note-line);
    border-left: 4px solid var(--note-accent);
    border-radius: 0.3rem;
    background: rgba(255, 255, 255, 0.66);
}

.note-card strong,
.boundary-note strong,
.version-note strong {
    color: var(--note-accent);
}

.note-card p,
.boundary-note p,
.version-note p {
    margin: 0.35rem 0 0;
    color: #4f5a54;
    font-size: 0.9rem;
}

.decision-list {
    margin: 1.5rem 0;
    padding: 0 !important;
    list-style: none;
    counter-reset: decisions;
}

.decision-list li {
    position: relative;
    margin: 0 !important;
    padding: 0.85rem 0 0.85rem 2.8rem;
    border-bottom: 1px solid var(--note-line);
    counter-increment: decisions;
}

.decision-list li::before {
    content: counter(decisions, decimal-leading-zero);
    position: absolute;
    top: 0.9rem;
    left: 0;
    color: var(--note-accent);
    font-size: 0.72rem;
    font-weight: 800;
}

.timeline {
    margin: 2rem 0;
    padding: 0;
    list-style: none;
}

.timeline li {
    display: grid;
    grid-template-columns: 5rem minmax(0, 1fr);
    gap: 1rem;
    padding: 1.2rem 0;
    border-bottom: 1px solid var(--note-line);
}

.timeline time {
    color: var(--note-accent);
    font-weight: 800;
}

.source-note {
    background: #f6f5ef;
}

.source-note h2,
.article-end h2 {
    margin: 0 0 1rem;
    font-family: ui-serif, "Songti SC", "STSong", serif;
    font-size: 1.7rem;
}

.source-note a,
.article-end a {
    color: var(--note-accent);
}

.article-end {
    border-top: 1px solid var(--note-line);
    text-align: center;
}

.article-end-links {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.article-end-links a {
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--note-line);
    text-decoration: none;
}

.field-note-footer {
    margin-top: 4rem;
    border-top: 1px solid var(--note-line);
    background: var(--note-paper);
}

:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--note-accent) 50%, white);
    outline-offset: 3px;
}

@media (min-width: 1280px) {
    .reading-shell {
        grid-template-columns: 13.5rem minmax(0, 72rem);
        gap: 2.5rem;
    }

    .book-page--title {
        padding-left: 5.2rem;
    }

    .chapter-body {
        padding-inline: 5.2rem;
    }
}

@media (max-width: 1100px) {
    .reading-shell {
        grid-template-columns: minmax(0, 58rem);
    }

    .article-toc {
        display: none;
    }

    .mobile-toc {
        display: block;
        margin: 0 0 1rem;
        border: 1px solid var(--note-line);
        background: var(--note-paper);
    }

    .mobile-toc > summary {
        min-height: auto;
        padding: 0.9rem 3.5rem 0.9rem 1rem;
        font-weight: 750;
    }

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

@media (max-width: 768px) {
    .field-note-main {
        padding: 6.7rem 0.85rem 2.5rem;
    }

    .post {
        border-radius: 0;
        box-shadow: 0 0.8rem 2.5rem rgba(32, 41, 37, 0.06);
    }

    .book-spread,
    .overview-grid,
    .thesis-grid,
    .risk-grid,
    .systems-grid,
    .motive-grid {
        grid-template-columns: 1fr;
    }

    .post-header {
        min-height: 0;
    }

    .post-header::after {
        display: none;
    }

    .book-page {
        padding: 2.3rem 1.45rem;
    }

    .book-page--title {
        min-height: 22rem;
        border-bottom: 1px solid var(--note-line);
    }

    .book-page--title h1 {
        font-size: clamp(2.65rem, 14vw, 4rem);
    }

    .overview-card,
    .source-note,
    .article-end {
        padding: 2.1rem 1.35rem;
    }

    .story-chapter > summary {
        min-height: 5.5rem;
        padding: 1.2rem 3.2rem 1.2rem 1.2rem;
        grid-template-columns: 1.75rem minmax(0, 1fr);
    }

    .story-chapter > summary::after {
        right: 1.1rem;
    }

    .chapter-body {
        padding: 0.75rem 1.35rem 3rem;
    }

    .chapter-title {
        font-size: 1.12rem;
    }

    .chapter-meta {
        font-size: 0.72rem;
    }

    .overview-grid p,
    .chapter-prose p,
    .chapter-prose li,
    .source-note p,
    .source-note li,
    .article-end p {
        font-size: 1rem;
        line-height: 1.88;
    }

    .timeline li {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }
}

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

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media print {
    .navbar,
    .article-toc,
    .mobile-toc,
    .back-link,
    .field-note-footer {
        display: none !important;
    }

    .field-note-page,
    .post,
    .source-note {
        background: #fff !important;
        box-shadow: none !important;
    }

    .field-note-main {
        padding: 0;
    }

    .reading-shell {
        display: block;
    }

    .post {
        border: 0;
    }

    .story-chapter {
        break-inside: avoid-page;
    }
}