/* The knowledge articles (/wissen): one look for all of them, first set for the article on practising and the brain. */
:root {
    color-scheme: light;
    --brain-ink: #0b0b0b;
    --brain-ink-2: #151515;
    --brain-paper: #f3f2ee;
    --brain-paper-2: #e8e5dd;
    --brain-text: #171716;
    --brain-muted: #67655f;
    --brain-light-muted: rgba(255, 255, 255, 0.64);
    --brain-line: rgba(16, 16, 15, 0.16);
    --brain-dark-line: rgba(255, 255, 255, 0.14);
    --brain-accent: #d4a340;
    --brain-accent-dark: #8b6418;
    --brain-max: 1240px;
    --brain-reading: 43rem;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 2rem;
}

body.brain-page {
    margin: 0;
    background: var(--brain-ink);
    color: var(--brain-paper);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

.brain-page a,
.brain-page button {
    font: inherit;
}

.brain-skip {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 100;
    padding: 0.7rem 1rem;
    background: var(--brain-paper);
    color: var(--brain-ink);
    text-decoration: none;
    transform: translateY(-160%);
    transition: transform 160ms ease;
}

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

.brain-header,
.brain-hero__inner,
.brain-article__inner,
.brain-footer {
    width: min(calc(100% - 3rem), var(--brain-max));
    margin-inline: auto;
}

.brain-header {
    min-height: 5.7rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    border-bottom: 1px solid var(--brain-dark-line);
}

.brain-brand {
    color: var(--brain-paper);
    font-size: 0.75rem;
    font-weight: 750;
    letter-spacing: 0.2em;
    text-decoration: none;
    text-transform: uppercase;
    white-space: nowrap;
}

.brain-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: clamp(0.9rem, 2.4vw, 1.8rem);
}

.brain-nav a {
    color: var(--brain-light-muted);
    font-size: 0.8rem;
    text-decoration: none;
}

.brain-nav a:hover,
.brain-nav a:focus-visible,
.brain-brand:hover,
.brain-brand:focus-visible {
    color: #fff;
}

.brain-hero {
    overflow: hidden;
    background:
        radial-gradient(circle at 78% 26%, rgba(212, 163, 64, 0.13), transparent 29rem),
        linear-gradient(180deg, var(--brain-ink) 0%, #10100f 100%);
}

.brain-hero__inner {
    min-height: min(48rem, calc(100vh - 5.7rem));
    display: grid;
    grid-template-columns: minmax(0, 1.18fr) minmax(19rem, 0.82fr);
    gap: clamp(3rem, 7vw, 7rem);
    align-items: center;
    padding-block: clamp(4.8rem, 10vw, 8.5rem);
}

.brain-kicker,
.brain-section-label,
.brain-note__label,
.brain-card__label,
.brain-meta {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 750;
    letter-spacing: 0.19em;
    text-transform: uppercase;
}

.brain-kicker,
.brain-meta {
    color: var(--brain-light-muted);
}

.brain-hero h1 {
    max-width: 12ch;
    margin: 1.4rem 0 1.65rem;
    font-size: clamp(3.05rem, 7vw, 6.85rem);
    font-weight: 300;
    line-height: 0.96;
    letter-spacing: -0.045em;
    text-wrap: balance;
}

.brain-hero__lede {
    max-width: 37rem;
    margin: 0;
    color: #d8d5cd;
    font-size: clamp(1.2rem, 1.8vw, 1.55rem);
    font-weight: 300;
    line-height: 1.5;
}

.brain-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.2rem;
    margin-top: 2.4rem;
    letter-spacing: 0.11em;
}

.brain-axon {
    margin: 0;
    align-self: end;
}

.brain-axon svg {
    display: block;
    width: 100%;
    height: auto;
    overflow: visible;
}

.brain-axon__core {
    fill: none;
    stroke: rgba(243, 242, 238, 0.42);
    stroke-width: 6;
    stroke-linecap: round;
}

.brain-axon__sheath {
    fill: rgba(212, 163, 64, 0.16);
    stroke: var(--brain-accent);
    stroke-width: 1.5;
}

.brain-axon__node {
    fill: var(--brain-paper);
}

.brain-axon__signal {
    fill: none;
    stroke: #ffe5a1;
    stroke-width: 7;
    stroke-linecap: round;
    stroke-dasharray: 26 490;
    stroke-dashoffset: 0;
    filter: drop-shadow(0 0 7px rgba(255, 220, 133, 0.8));
    opacity: 0;
}

.brain-axon.is-active .brain-axon__signal {
    animation: brain-signal 2.5s ease-in-out 2;
}

.brain-axon figcaption {
    max-width: 29rem;
    margin-top: 1.4rem;
    color: var(--brain-light-muted);
    font-size: 0.82rem;
    line-height: 1.5;
}

@keyframes brain-signal {
    0% { stroke-dashoffset: 40; opacity: 0; }
    10%, 80% { opacity: 1; }
    100% { stroke-dashoffset: -500; opacity: 0; }
}

.brain-article {
    background: var(--brain-paper);
    color: var(--brain-text);
}

.brain-article__inner {
    padding-block: clamp(4.5rem, 8vw, 8rem);
}

.brain-thesis {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(15rem, 0.38fr);
    gap: clamp(2rem, 6vw, 6rem);
    align-items: end;
    padding-bottom: clamp(4rem, 8vw, 7rem);
    border-bottom: 1px solid var(--brain-line);
}

.brain-thesis blockquote {
    max-width: 18ch;
    margin: 0;
    font-size: clamp(2.25rem, 4.8vw, 4.8rem);
    font-weight: 300;
    line-height: 1.08;
    letter-spacing: -0.035em;
}

.brain-thesis p {
    margin: 0;
    color: var(--brain-muted);
    font-size: 1rem;
}

.brain-row {
    display: grid;
    grid-template-columns: minmax(0, var(--brain-reading)) minmax(13rem, 1fr);
    gap: clamp(3rem, 7vw, 7.5rem);
    align-items: start;
    padding-top: clamp(4.5rem, 8vw, 7.5rem);
}

.brain-row--single {
    grid-template-columns: minmax(0, var(--brain-reading));
}

.brain-prose {
    min-width: 0;
}

.brain-section-label {
    color: var(--brain-accent-dark);
}

.brain-prose h2 {
    max-width: 18ch;
    margin: 0.85rem 0 2rem;
    font-size: clamp(2.15rem, 4vw, 3.85rem);
    font-weight: 350;
    line-height: 1.06;
    letter-spacing: -0.035em;
    text-wrap: balance;
}

.brain-prose h3 {
    margin: 2.8rem 0 1rem;
    font-size: clamp(1.3rem, 2vw, 1.65rem);
    font-weight: 600;
    line-height: 1.25;
}

.brain-prose p,
.brain-prose li {
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.08rem, 0.35vw + 1rem, 1.2rem);
    line-height: 1.78;
}

.brain-prose p {
    margin: 0 0 1.55rem;
}

.brain-prose strong {
    font-weight: 700;
}

.brain-ref a {
    display: inline-flex;
    min-width: 1.1rem;
    min-height: 1.1rem;
    align-items: center;
    justify-content: center;
    margin-left: 0.12rem;
    border-bottom: 1px solid currentColor;
    color: var(--brain-accent-dark);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 0.68em;
    font-weight: 750;
    line-height: 1;
    text-decoration: none;
    vertical-align: super;
}

.brain-note,
.brain-card {
    position: relative;
    padding: 1.5rem;
    border-top: 2px solid var(--brain-accent);
    background: rgba(255, 255, 255, 0.43);
}

.brain-note {
    margin-top: 5.2rem;
}

.brain-note__label,
.brain-card__label {
    color: var(--brain-accent-dark);
}

.brain-note p,
.brain-card p {
    margin: 0.75rem 0 0;
    color: #4f4d47;
    font-size: 0.93rem;
    line-height: 1.65;
}

.brain-note--experience {
    border-color: var(--brain-text);
}

.brain-note--experience .brain-note__label {
    color: var(--brain-text);
}

.brain-myelin-limit {
    margin: 2.2rem 0;
    padding: 1.65rem 1.8rem;
    border-left: 4px solid var(--brain-accent);
    background: var(--brain-paper-2);
}

.brain-myelin-limit p {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 1rem;
    line-height: 1.65;
}

.brain-process {
    margin: clamp(4rem, 8vw, 7rem) 0 0;
    padding: clamp(2rem, 4vw, 3.5rem);
    border: 1px solid var(--brain-line);
    background: #ece9e1;
}

.brain-process figcaption,
.brain-systems figcaption {
    margin-bottom: 1.8rem;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.brain-process__steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--brain-line);
}

.brain-process__step {
    min-height: 13rem;
    padding: 1.7rem;
    background: var(--brain-paper);
    transition: background 350ms ease, transform 350ms ease;
}

.brain-process__step.is-active {
    background: #f8edcf;
    transform: translateY(-0.35rem);
}

.brain-process__index {
    color: var(--brain-accent-dark);
    font-size: 0.8rem;
    font-weight: 750;
    letter-spacing: 0.16em;
}

.brain-process__step h3 {
    margin: 3.2rem 0 0.65rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.brain-process__step p {
    margin: 0;
    color: var(--brain-muted);
    font-size: 0.9rem;
    line-height: 1.55;
}

.brain-systems {
    margin: 5.2rem 0 0;
}

.brain-systems__map {
    display: grid;
    grid-template-columns: repeat(2, minmax(7rem, 1fr));
    gap: 0.75rem;
    padding: 1rem;
    border: 1px solid var(--brain-line);
}

.brain-systems__item,
.brain-systems__center {
    min-height: 5.5rem;
    display: grid;
    place-items: center;
    padding: 0.8rem;
    border: 1px solid var(--brain-line);
    text-align: center;
    font-size: 0.85rem;
    font-weight: 650;
}

.brain-systems__center {
    grid-column: 1 / -1;
    background: var(--brain-ink-2);
    color: var(--brain-paper);
    font-size: 1rem;
}

.brain-practice {
    margin-top: clamp(5rem, 9vw, 8rem);
    display: grid;
    grid-template-columns: minmax(13rem, 0.42fr) minmax(0, 1fr);
    gap: clamp(2.5rem, 6vw, 6rem);
    padding: clamp(2.2rem, 5vw, 4.7rem);
    background: var(--brain-ink-2);
    color: var(--brain-paper);
}

.brain-practice h2 {
    max-width: 9ch;
    margin: 0.8rem 0 0;
    font-size: clamp(2.4rem, 4.6vw, 4.5rem);
    font-weight: 300;
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.brain-practice .brain-section-label {
    color: #f1c96d;
}

.brain-practice ol {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: brain-rule;
}

.brain-practice li {
    counter-increment: brain-rule;
    display: grid;
    grid-template-columns: 2.3rem 1fr;
    gap: 1rem;
    padding: 1rem 0;
    border-top: 1px solid var(--brain-dark-line);
    color: #d8d5cd;
    font-size: 1rem;
    line-height: 1.55;
}

.brain-practice li::before {
    content: counter(brain-rule, decimal-leading-zero);
    color: #f1c96d;
    font-size: 0.8rem;
    font-weight: 750;
    letter-spacing: 0.12em;
}

.brain-author,
.brain-cta {
    margin-top: clamp(5rem, 9vw, 8rem);
}

.brain-author {
    display: grid;
    grid-template-columns: 0.35fr 1fr;
    gap: clamp(2rem, 6vw, 6rem);
    padding-block: 2.5rem;
    border-block: 1px solid var(--brain-line);
}

.brain-author h2,
.brain-cta h2,
.brain-sources h2 {
    margin: 0;
    font-size: clamp(1.8rem, 3vw, 2.7rem);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.025em;
}

.brain-author p {
    max-width: 43rem;
    margin: 0;
    color: var(--brain-muted);
    font-size: 1.02rem;
    line-height: 1.7;
}

.brain-author p + p {
    margin-top: 1.15rem;
    padding-top: 1.15rem;
    border-top: 1px solid var(--brain-line);
}

.brain-cta {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: end;
    padding: clamp(2rem, 5vw, 4rem);
    background: #dfd6c1;
}

.brain-cta p {
    max-width: 42rem;
    margin: 1rem 0 0;
    color: #575249;
    font-size: 1rem;
    line-height: 1.65;
}

.brain-cta__actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.75rem;
}

.brain-button {
    display: inline-flex;
    min-height: 3.1rem;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.1rem;
    border: 1px solid var(--brain-text);
    background: var(--brain-text);
    color: var(--brain-paper);
    font-size: 0.84rem;
    font-weight: 700;
    text-decoration: none;
}

.brain-button--secondary {
    background: transparent;
    color: var(--brain-text);
}

.brain-button:hover,
.brain-button:focus-visible {
    background: var(--brain-accent-dark);
    border-color: var(--brain-accent-dark);
    color: #fff;
}

.brain-sources {
    margin-top: clamp(5rem, 10vw, 9rem);
    padding-top: clamp(3rem, 6vw, 5rem);
    border-top: 1px solid var(--brain-line);
}

.brain-sources__intro {
    max-width: 42rem;
    margin: 1rem 0 2.8rem;
    color: var(--brain-muted);
    font-size: 0.95rem;
    line-height: 1.65;
}

.brain-sources ol {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: brain-source;
}

.brain-sources li {
    counter-increment: brain-source;
    display: grid;
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 1rem;
    padding: 1.35rem 0;
    border-top: 1px solid var(--brain-line);
    scroll-margin-top: 2rem;
}

.brain-sources li::before {
    content: counter(brain-source, decimal-leading-zero);
    color: var(--brain-accent-dark);
    font-size: 0.75rem;
    font-weight: 750;
    letter-spacing: 0.1em;
}

.brain-sources li:target {
    background: linear-gradient(90deg, rgba(212, 163, 64, 0.15), transparent 75%);
}

.brain-source__citation,
.brain-source__use {
    margin: 0;
}

.brain-source__citation {
    font-size: 0.94rem;
    line-height: 1.6;
}

.brain-source__citation a {
    color: var(--brain-accent-dark);
    font-weight: 700;
    overflow-wrap: anywhere;
    text-underline-offset: 0.2em;
}

.brain-source__use {
    margin-top: 0.45rem;
    color: var(--brain-muted);
    font-size: 0.86rem;
    line-height: 1.55;
}

.brain-backref {
    margin-left: 0.4rem;
    color: var(--brain-muted) !important;
    font-weight: 400 !important;
    text-decoration: none;
}

.brain-footer {
    min-height: 7rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    color: var(--brain-light-muted);
    font-size: 0.78rem;
}

.brain-footer nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 1rem;
}

.brain-footer a {
    color: inherit;
    text-decoration: none;
}

.brain-footer a:hover,
.brain-footer a:focus-visible {
    color: #fff;
}

.brain-page :focus-visible {
    outline: 3px solid var(--brain-accent);
    outline-offset: 4px;
}

[data-reveal].is-revealing {
    animation: brain-reveal 700ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

@keyframes brain-reveal {
    from { opacity: 0.55; transform: translateY(1rem); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 960px) {
    .brain-hero__inner,
    .brain-thesis,
    .brain-row,
    .brain-practice,
    .brain-author,
    .brain-cta {
        grid-template-columns: 1fr;
    }

    .brain-hero__inner {
        min-height: auto;
    }

    .brain-axon {
        width: min(100%, 34rem);
        align-self: auto;
    }

    .brain-thesis blockquote {
        max-width: 20ch;
    }

    .brain-row {
        gap: 2rem;
    }

    .brain-note,
    .brain-systems {
        width: min(100%, var(--brain-reading));
        margin-top: 0;
    }

    .brain-practice h2 {
        max-width: 15ch;
    }

    .brain-cta__actions {
        justify-content: flex-start;
    }
}

@media (max-width: 680px) {
    .brain-header,
    .brain-hero__inner,
    .brain-article__inner,
    .brain-footer {
        width: min(calc(100% - 2rem), var(--brain-max));
    }

    .brain-header {
        min-height: 6.8rem;
        display: block;
        padding-block: 1.1rem;
    }

    .brain-brand {
        display: inline-block;
    }

    .brain-nav {
        justify-content: flex-start;
        gap: 1.15rem;
        margin-top: 0.9rem;
        padding-bottom: 0.2rem;
        overflow-x: auto;
        scrollbar-width: none;
    }

    .brain-nav::-webkit-scrollbar {
        display: none;
    }

    .brain-nav a {
        flex: 0 0 auto;
    }

    .brain-hero__inner {
        padding-block: 4rem;
    }

    .brain-hero h1 {
        font-size: clamp(2.75rem, 13vw, 4.2rem);
        overflow-wrap: anywhere;
    }

    .brain-process {
        padding: 1.25rem;
    }

    .brain-process__steps {
        grid-template-columns: 1fr;
    }

    .brain-process__step {
        min-height: auto;
    }

    .brain-process__step h3 {
        margin-top: 1.8rem;
    }

    .brain-practice {
        padding: 1.5rem;
    }

    .brain-author,
    .brain-cta {
        gap: 1.4rem;
    }

    .brain-cta {
        padding: 1.5rem;
    }

    .brain-cta__actions,
    .brain-button {
        width: 100%;
    }

    .brain-footer {
        display: block;
        padding-block: 2rem;
    }

    .brain-footer nav {
        justify-content: flex-start;
        margin-top: 1rem;
    }
}

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

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

    .brain-axon__signal {
        display: none;
    }
}