:root {
    --color-bg: oklch(0.99 0 0);
    --color-surface: oklch(0.965 0.008 255);
    --color-surface-strong: oklch(0.925 0.018 255);
    --color-ink: oklch(0.22 0.035 255);
    --color-ink-soft: oklch(0.31 0.04 255);
    --color-muted: oklch(0.48 0.025 255);
    --color-brand: oklch(0.58 0.19 255);
    --color-brand-dark: oklch(0.44 0.17 255);
    --color-signal: oklch(0.78 0.16 140);
    --color-warning: oklch(0.68 0.18 45);
    --color-line: oklch(0.89 0.012 255);
    --color-white: oklch(1 0 0);
    --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --content-width: 1180px;
    --reading-width: 760px;
    --radius-small: 8px;
    --radius-medium: 14px;
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --z-dropdown: 30;
    --z-sticky: 40;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-ink);
    font-family: var(--gh-font-body, var(--font-sans));
    font-size: 16px;
    line-height: 1.65;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--gh-font-heading, var(--font-sans));
}

img,
svg,
video {
    display: block;
    max-width: 100%;
}

img {
    height: auto;
}

a {
    color: inherit;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

a:hover {
    color: var(--color-brand-dark);
}

button,
input,
select,
textarea {
    color: inherit;
    font: inherit;
}

:focus-visible {
    outline: 3px solid var(--color-signal);
    outline-offset: 3px;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 100;
    padding: 10px 14px;
    transform: translateY(-160%);
    border-radius: var(--radius-small);
    background: var(--color-ink);
    color: var(--color-white);
    transition: transform 160ms var(--ease-out);
}

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

.button,
.text-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    font-weight: 700;
}

.button {
    padding: 0 20px;
    border: 1px solid var(--color-brand);
    border-radius: var(--radius-small);
    background: var(--color-brand);
    color: var(--color-white);
    text-decoration: none;
    transition: background-color 160ms var(--ease-out), border-color 160ms var(--ease-out), transform 160ms var(--ease-out);
}

.button:hover {
    border-color: var(--color-brand-dark);
    background: var(--color-brand-dark);
    color: var(--color-white);
    transform: translateY(-1px);
}

.button--compact {
    min-height: 40px;
    padding-inline: 15px;
    font-size: 14px;
}

.button--light {
    border-color: var(--color-white);
    background: var(--color-white);
    color: var(--color-ink);
}

.button--light:hover {
    border-color: var(--color-signal);
    background: var(--color-signal);
    color: var(--color-ink);
}

.button--outline {
    border-color: var(--color-ink);
    background: transparent;
    color: var(--color-ink);
}

.button--outline:hover {
    background: var(--color-ink);
    color: var(--color-white);
}

.text-link {
    min-height: 40px;
    color: var(--color-brand-dark);
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 22px;
}

.section-label {
    margin: 0 0 14px;
    color: var(--color-brand-dark);
    font-size: 14px;
    font-weight: 800;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    border-bottom: 1px solid color-mix(in oklch, var(--color-line), transparent 30%);
    background: color-mix(in oklch, var(--color-bg), transparent 4%);
    backdrop-filter: blur(14px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: 26px;
    width: min(calc(100% - 40px), var(--content-width));
    min-height: 72px;
    margin: 0 auto;
}

.wordmark {
    flex: 0 0 auto;
    color: var(--color-ink);
    font-size: 21px;
    font-weight: 900;
    letter-spacing: -0.03em;
    text-decoration: none;
}

.wordmark span span {
    color: var(--color-brand);
}

.wordmark img {
    width: auto;
    max-width: 140px;
    max-height: 38px;
}

.wordmark--footer {
    display: inline-block;
    margin-bottom: 10px;
    color: var(--color-white);
}

.site-nav {
    display: flex;
    flex: 1 1 auto;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.site-nav__link,
.nav-group summary {
    display: flex;
    align-items: center;
    min-height: 40px;
    padding: 8px 9px;
    border-radius: var(--radius-small);
    color: var(--color-ink-soft);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
}

.site-nav__link:hover,
.nav-group summary:hover,
.nav-group[open] summary {
    background: var(--color-surface);
    color: var(--color-ink);
}

.nav-group {
    position: relative;
}

.nav-group summary {
    list-style: none;
}

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

.nav-group summary::after {
    width: 7px;
    height: 7px;
    margin: -3px 0 0 8px;
    transform: rotate(45deg);
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    content: "";
    transition: transform 160ms var(--ease-out);
}

.nav-group[open] summary::after {
    margin-top: 3px;
    transform: rotate(225deg);
}

.nav-panel {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    z-index: var(--z-dropdown);
    display: grid;
    width: 240px;
    padding: 10px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-medium);
    background: var(--color-white);
    box-shadow: 0 7px 8px color-mix(in oklch, var(--color-ink), transparent 90%);
}

.nav-panel a {
    padding: 10px 12px;
    border-radius: var(--radius-small);
    color: var(--color-ink-soft);
    font-size: 14px;
    font-weight: 650;
    text-decoration: none;
}

.nav-panel a:hover {
    background: var(--color-surface);
    color: var(--color-brand-dark);
}

.site-header__actions {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    gap: 10px;
}

.site-header__actions .gh-search-icon {
    width: 40px !important;
    height: 40px !important;
    border-radius: var(--radius-small) !important;
}

.site-header__actions .gh-search-icon:hover {
    background: var(--color-surface) !important;
}

.menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 42px;
    padding: 0 12px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-small);
    background: var(--color-white);
    font-weight: 750;
}

.menu-toggle__icon,
.menu-toggle__icon::before,
.menu-toggle__icon::after {
    display: block;
    width: 17px;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    content: "";
}

.menu-toggle__icon {
    position: relative;
}

.menu-toggle__icon::before {
    position: absolute;
    top: -5px;
}

.menu-toggle__icon::after {
    position: absolute;
    top: 5px;
}

.home-hero {
    overflow: hidden;
    background: var(--color-bg);
}

.home-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.14fr) minmax(360px, 0.86fr);
    gap: clamp(40px, 8vw, 112px);
    align-items: center;
    width: min(calc(100% - 40px), var(--content-width));
    min-height: 650px;
    margin: 0 auto;
    padding: 88px 0 96px;
}

.home-hero__copy h1 {
    max-width: 8.5em;
    margin: 0;
    font-size: clamp(42px, 5.25vw, 64px);
    line-height: 1.08;
    letter-spacing: -0.03em;
    text-wrap: wrap;
}

.home-hero__lead {
    max-width: 620px;
    margin: 28px 0 30px;
    color: var(--color-muted);
    font-size: clamp(18px, 2vw, 21px);
    line-height: 1.75;
    text-wrap: pretty;
}

.home-hero__note {
    margin: 18px 0 0;
    color: var(--color-muted);
    font-size: 13px;
}

.route-map {
    position: relative;
    padding: 34px;
    border-radius: var(--radius-medium);
    background: var(--color-ink);
    color: var(--color-white);
}

.route-map::before {
    position: absolute;
    top: 66px;
    bottom: 78px;
    left: 57px;
    width: 1px;
    background: color-mix(in oklch, var(--color-white), transparent 72%);
    content: "";
}

.route-map__step {
    position: relative;
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 18px;
    align-items: start;
    padding: 14px 0 26px;
}

.route-map__step > span {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border: 1px solid color-mix(in oklch, var(--color-white), transparent 64%);
    border-radius: 50%;
    background: var(--color-ink);
    color: var(--color-signal);
    font-size: 13px;
    font-weight: 800;
}

.route-map__step strong {
    display: block;
    margin: 2px 0 5px;
    font-size: 18px;
}

.route-map__step p {
    margin: 0;
    color: color-mix(in oklch, var(--color-white), transparent 30%);
    font-size: 14px;
}

.route-map > a {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    padding-top: 22px;
    border-top: 1px solid color-mix(in oklch, var(--color-white), transparent 75%);
    color: var(--color-white);
    font-weight: 750;
    text-decoration: none;
}

.route-map > a:hover {
    color: var(--color-signal);
}

.start-strip {
    background: var(--color-signal);
}

.start-strip__inner {
    display: grid;
    grid-template-columns: 0.7fr 1.3fr;
    gap: 60px;
    align-items: center;
    width: min(calc(100% - 40px), var(--content-width));
    margin: 0 auto;
    padding: 34px 0;
}

.start-strip h2,
.start-strip p {
    margin: 0;
}

.start-strip h2 {
    font-size: 24px;
    letter-spacing: -0.02em;
}

.start-strip p {
    margin-top: 4px;
    color: var(--color-ink-soft);
}

.start-strip__links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
}

.start-strip__links a {
    padding: 10px 14px;
    border: 1px solid color-mix(in oklch, var(--color-ink), transparent 55%);
    border-radius: 999px;
    color: var(--color-ink);
    font-size: 14px;
    font-weight: 750;
    text-decoration: none;
}

.start-strip__links a:hover {
    border-color: var(--color-ink);
    background: var(--color-ink);
    color: var(--color-white);
}

.topic-section,
.latest-section,
.video-section,
.trust-section,
.archive-feed,
.page-shell,
.article-footer,
.learning-stages,
.shooting-note,
.about-layout {
    width: min(calc(100% - 40px), var(--content-width));
    margin-inline: auto;
}

.topic-section,
.latest-section {
    padding: 100px 0;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 30px;
    margin-bottom: 42px;
}

.section-heading h2,
.video-section h2,
.trust-section h2,
.shooting-note h2 {
    margin: 0;
    font-size: clamp(34px, 4.5vw, 52px);
    line-height: 1.14;
    letter-spacing: -0.03em;
    text-wrap: balance;
}

.section-heading p,
.video-section__intro > p,
.trust-section p,
.shooting-note > p {
    max-width: 660px;
    margin: 12px 0 0;
    color: var(--color-muted);
    font-size: 17px;
}

.topic-list {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.topic-item {
    grid-column: span 4;
    min-height: 280px;
    padding: 30px 22px;
    border-right: 1px solid var(--color-line);
    color: var(--color-ink);
    text-decoration: none;
    transition: background-color 180ms var(--ease-out), color 180ms var(--ease-out);
}

.topic-item:first-child {
    grid-column: span 4;
    padding-inline: 32px;
    background: var(--color-ink);
    color: var(--color-white);
}

.topic-item:nth-child(3n) {
    border-right: 0;
}

.topic-item:nth-child(n + 4) {
    border-top: 1px solid var(--color-line);
}

.topic-item:hover {
    background: var(--color-surface);
    color: var(--color-brand-dark);
}

.topic-item:first-child:hover {
    background: var(--color-ink-soft);
    color: var(--color-white);
}

.topic-item > span {
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 750;
}

.topic-item:first-child > span {
    color: var(--color-signal);
}

.topic-item h3 {
    margin: 42px 0 12px;
    font-size: 22px;
    line-height: 1.25;
}

.topic-item p {
    margin: 0 0 28px;
    color: var(--color-muted);
    font-size: 14px;
}

.topic-item:first-child p {
    max-width: 30ch;
    color: color-mix(in oklch, var(--color-white), transparent 26%);
}

.topic-item strong {
    font-size: 14px;
}

.latest-section {
    border-top: 1px solid var(--color-line);
}

.latest-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(340px, 0.8fr);
    gap: 48px;
}

.lead-story {
    min-width: 0;
}

.lead-story__media {
    display: grid;
    place-items: center;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: var(--radius-medium);
    background: var(--color-surface-strong);
    color: var(--color-ink-soft);
    text-decoration: none;
}

.lead-story__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 420ms var(--ease-out);
}

.lead-story:hover .lead-story__media img {
    transform: scale(1.025);
}

.lead-story__body {
    padding-top: 24px;
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 650;
}

.post-meta a {
    color: var(--color-brand-dark);
    text-decoration: none;
}

.lead-story h3 {
    max-width: 20ch;
    margin: 12px 0;
    font-size: clamp(30px, 4vw, 44px);
    line-height: 1.2;
    letter-spacing: -0.025em;
    text-wrap: balance;
}

.lead-story h3 a,
.post-card h3 a {
    text-decoration: none;
}

.lead-story__body > p {
    max-width: 65ch;
    margin: 0 0 10px;
    color: var(--color-muted);
    font-size: 16px;
}

.latest-list,
.archive-list {
    display: grid;
    align-content: start;
}

.post-card {
    display: grid;
    grid-template-columns: 138px minmax(0, 1fr);
    gap: 18px;
    padding: 22px 0;
    border-bottom: 1px solid var(--color-line);
}

.post-card:first-child {
    padding-top: 0;
}

.post-card__media {
    display: grid;
    place-items: center;
    align-self: start;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    border-radius: var(--radius-small);
    background: var(--color-surface-strong);
    color: var(--color-ink-soft);
    font-size: 12px;
    font-weight: 750;
    text-align: center;
    text-decoration: none;
}

.post-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-card h3 {
    margin: 7px 0;
    font-size: 18px;
    line-height: 1.4;
    text-wrap: pretty;
}

.post-card__body > p {
    display: -webkit-box;
    margin: 0;
    overflow: hidden;
    color: var(--color-muted);
    font-size: 13px;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    margin-top: 48px;
    color: var(--color-muted);
    font-size: 14px;
}

.pagination a {
    color: var(--color-brand-dark);
    font-weight: 750;
}

.empty-state {
    padding: 54px 0;
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.empty-state h2,
.empty-state h3 {
    margin: 0 0 10px;
    font-size: 28px;
}

.empty-state p {
    margin: 0;
    color: var(--color-muted);
}

.video-section {
    display: grid;
    grid-template-columns: 0.72fr 1.28fr;
    gap: 68px;
    padding: 74px;
    border-radius: var(--radius-medium);
    background: var(--color-ink);
    color: var(--color-white);
}

.video-section .section-label {
    color: var(--color-signal);
}

.video-section__intro > p {
    color: color-mix(in oklch, var(--color-white), transparent 28%);
}

.video-section__intro .button {
    margin-top: 24px;
}

.video-plan {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    grid-template-rows: 1fr 1fr;
    gap: 12px;
}

.video-plan__item {
    display: block;
    padding: 22px;
    border: 1px solid color-mix(in oklch, var(--color-white), transparent 72%);
    border-radius: var(--radius-small);
    color: var(--color-white);
    text-decoration: none;
    transition: border-color 180ms var(--ease-out), background-color 180ms var(--ease-out);
}

.video-plan__item:hover {
    border-color: color-mix(in oklch, var(--color-signal), transparent 30%);
    background: color-mix(in oklch, var(--color-white), transparent 92%);
    color: var(--color-white);
}

.video-plan__primary {
    grid-row: 1 / 3;
    background: var(--color-white);
    color: var(--color-ink);
}

.video-plan__primary:hover {
    background: var(--color-surface);
    color: var(--color-ink);
}

.video-plan span {
    color: var(--color-signal);
    font-size: 13px;
    font-weight: 800;
}

.video-plan__primary span {
    color: var(--color-brand-dark);
}

.video-plan h3 {
    margin: 38px 0 10px;
    font-size: 22px;
    line-height: 1.3;
}

.video-plan__primary h3 {
    margin-top: 72px;
    font-size: 30px;
}

.video-plan p {
    margin: 0;
    color: color-mix(in oklch, var(--color-white), transparent 28%);
    font-size: 14px;
}

.video-plan__primary p {
    color: var(--color-muted);
}

.video-plan strong {
    display: block;
    margin-top: 38px;
    color: var(--color-brand-dark);
    font-size: 13px;
}

.trust-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    padding: 92px 0 110px;
}

.trust-section h2 {
    font-size: clamp(34px, 4vw, 48px);
}

.trust-section p {
    max-width: 760px;
}

.site-footer {
    background: var(--color-ink);
    color: var(--color-white);
}

.site-footer__inner {
    display: grid;
    grid-template-columns: 0.9fr 0.7fr 1.4fr;
    gap: 60px;
    width: min(calc(100% - 40px), var(--content-width));
    margin: 0 auto;
    padding: 64px 0;
}

.site-footer p {
    margin: 0;
    color: color-mix(in oklch, var(--color-white), transparent 32%);
    font-size: 14px;
}

.site-footer__links strong {
    display: block;
    margin-bottom: 12px;
    font-size: 14px;
}

.site-footer__links nav {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-footer__links a {
    color: var(--color-white);
    font-size: 14px;
}

.site-footer__notice {
    display: grid;
    gap: 14px;
}

.article-header {
    padding: 92px 20px 60px;
}

.article-header__inner {
    width: min(100%, 980px);
    margin: 0 auto;
    text-align: center;
}

.article-kicker {
    display: inline-block;
    margin-bottom: 22px;
    color: var(--color-brand-dark);
    font-size: 14px;
    font-weight: 800;
    text-decoration: none;
}

.article-header h1 {
    max-width: 18ch;
    margin: 0 auto;
    font-size: clamp(42px, 6vw, 74px);
    line-height: 1.1;
    letter-spacing: -0.03em;
    text-wrap: balance;
}

.article-deck {
    max-width: 720px;
    margin: 26px auto 0;
    color: var(--color-muted);
    font-size: 20px;
    line-height: 1.75;
    text-wrap: pretty;
}

.article-byline {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 9px 18px;
    margin-top: 28px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 650;
}

.article-feature,
.page-feature {
    width: min(calc(100% - 40px), var(--content-width));
    margin: 0 auto 68px;
}

.article-feature img,
.page-feature img {
    width: 100%;
    max-height: 720px;
    border-radius: var(--radius-medium);
    object-fit: cover;
}

.article-feature figcaption,
.page-feature figcaption {
    margin-top: 10px;
    color: var(--color-muted);
    font-size: 13px;
    text-align: center;
}

.article-layout {
    display: grid;
    grid-template-columns: 210px minmax(0, var(--reading-width)) 210px;
    justify-content: center;
    gap: 42px;
    width: min(calc(100% - 40px), var(--content-width));
    margin: 0 auto;
}

.article-aside {
    align-self: start;
    padding: 18px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-small);
    color: var(--color-ink-soft);
    font-size: 13px;
}

.article-aside p {
    margin: 8px 0 0;
    color: var(--color-muted);
}

.gh-content {
    min-width: 0;
    font-size: 17px;
    line-height: 1.82;
}

.gh-content > * {
    max-width: var(--reading-width);
    margin-right: auto;
    margin-left: auto;
}

.gh-content > * + * {
    margin-top: 1.5em;
}

.gh-content h2,
.gh-content h3,
.gh-content h4 {
    line-height: 1.28;
    letter-spacing: -0.02em;
    text-wrap: balance;
}

.gh-content h2 {
    margin-top: 2.35em;
    font-size: 32px;
}

.gh-content h3 {
    margin-top: 2em;
    font-size: 25px;
}

.gh-content h4 {
    font-size: 20px;
}

.gh-content p,
.gh-content li {
    text-wrap: pretty;
}

.gh-content a {
    color: var(--color-brand-dark);
}

.gh-content blockquote {
    padding: 20px 24px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-small);
    background: var(--color-surface);
    color: var(--color-ink-soft);
}

.gh-content pre {
    max-width: 100%;
    overflow-x: auto;
    padding: 22px;
    border-radius: var(--radius-small);
    background: var(--color-ink);
    color: var(--color-white);
    font-size: 14px;
    line-height: 1.65;
}

.gh-content code {
    padding: 0.15em 0.35em;
    border-radius: 4px;
    background: var(--color-surface-strong);
    font-size: 0.9em;
}

.gh-content pre code {
    padding: 0;
    background: transparent;
}

.gh-content img,
.gh-content video,
.gh-content iframe {
    border-radius: var(--radius-small);
}

.gh-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
}

.gh-content th,
.gh-content td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--color-line);
    text-align: left;
    vertical-align: top;
}

.gh-content th {
    background: var(--color-surface);
}

.gh-content .kg-width-wide {
    max-width: 980px;
}

.gh-content .kg-width-full {
    max-width: none;
}

.article-footer {
    margin-top: 70px;
    padding: 54px 0 100px;
    border-top: 1px solid var(--color-line);
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.article-tags a {
    padding: 7px 11px;
    border: 1px solid var(--color-line);
    border-radius: 999px;
    color: var(--color-ink-soft);
    font-size: 13px;
    text-decoration: none;
}

.article-author {
    display: flex;
    gap: 18px;
    align-items: center;
    max-width: 760px;
    margin: 42px 0;
}

.article-author__mark,
.about-mark {
    display: grid;
    flex: 0 0 auto;
    place-items: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--color-ink);
    color: var(--color-signal);
    font-weight: 900;
}

.article-author p {
    margin: 4px 0 0;
    color: var(--color-muted);
}

.article-next {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 1px solid var(--color-line);
}

.article-next a {
    display: grid;
    gap: 7px;
    padding: 26px 26px 0 0;
    text-decoration: none;
}

.article-next a + a {
    padding-right: 0;
    padding-left: 26px;
    border-left: 1px solid var(--color-line);
}

.article-next span {
    color: var(--color-muted);
    font-size: 13px;
}

.page-shell {
    padding: 88px 0 110px;
}

.page-header,
.archive-header,
.learning-header,
.resource-header,
.about-hero,
.error-page {
    width: min(calc(100% - 40px), var(--content-width));
    margin-inline: auto;
}

.page-header,
.archive-header,
.error-page {
    padding: 88px 0 58px;
}

.page-header h1,
.archive-header h1,
.learning-header h1,
.resource-header h1,
.about-hero h1,
.error-page h1 {
    max-width: 18ch;
    margin: 0;
    font-size: clamp(42px, 6vw, 72px);
    line-height: 1.1;
    letter-spacing: -0.03em;
    text-wrap: balance;
}

.page-header > p:last-child,
.archive-header > p:last-child,
.learning-header > div > p:last-child,
.resource-header > div > p:last-child,
.about-hero > div > p:last-child,
.error-page > p {
    max-width: 720px;
    margin: 22px 0 0;
    color: var(--color-muted);
    font-size: 19px;
}

.page-shell > .gh-content {
    width: min(100%, var(--reading-width));
    margin-inline: auto;
}

.archive-feed {
    padding: 0 0 110px;
}

.archive-list .post-card {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
    padding: 30px 0;
}

.archive-list .post-card:first-child {
    padding-top: 30px;
    border-top: 1px solid var(--color-line);
}

.archive-list .post-card h3 {
    font-size: 24px;
}

.archive-header--author > img {
    width: 96px;
    height: 96px;
    margin-bottom: 28px;
    border-radius: 50%;
    object-fit: cover;
}

.learning-header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 60px;
    align-items: end;
    padding: 88px 0 66px;
}

.learning-header__status {
    display: grid;
    gap: 4px;
    padding: 18px 20px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-small);
}

.learning-header__status span {
    color: var(--color-muted);
    font-size: 13px;
}

.learning-intro {
    width: min(calc(100% - 40px), var(--reading-width));
    margin: 0 auto 60px;
}

.learning-stages {
    padding-bottom: 90px;
}

.learning-stage {
    display: grid;
    grid-template-columns: 0.72fr 1.28fr;
    gap: 70px;
    padding: 48px 0;
    border-top: 1px solid var(--color-line);
}

.learning-stage:last-child {
    border-bottom: 1px solid var(--color-line);
}

.learning-stage header {
    display: grid;
    grid-template-columns: 78px 1fr;
    gap: 20px;
}

.learning-stage header > span {
    color: var(--color-brand-dark);
    font-size: 13px;
    font-weight: 800;
}

.learning-stage h2 {
    margin: 0;
    font-size: 28px;
    line-height: 1.25;
}

.learning-stage header p {
    margin: 10px 0 0;
    color: var(--color-muted);
}

.learning-stage__links {
    display: grid;
}

.learning-topic {
    display: grid;
    grid-template-columns: minmax(170px, 0.6fr) 1.4fr;
    gap: 24px;
    padding: 15px 0;
    border-bottom: 1px solid var(--color-line);
    scroll-margin-top: 110px;
}

.learning-topic:first-child {
    padding-top: 0;
}

.learning-stage__links span {
    color: var(--color-muted);
    font-size: 14px;
}

.shooting-note {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 70px;
    margin-bottom: 110px;
    padding: 48px;
    border-radius: var(--radius-medium);
    background: var(--color-surface);
}

.shooting-note h2 {
    font-size: 36px;
}

.shooting-note > div:last-child {
    display: grid;
    align-content: start;
    justify-items: start;
    gap: 16px;
}

.shooting-note > div:last-child p {
    margin: 0;
    color: var(--color-muted);
}

.resource-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 60px;
    align-items: end;
    padding: 88px 0 66px;
}

.resource-header--dark {
    width: min(calc(100% - 40px), var(--content-width));
    margin-top: 54px;
    padding: 58px;
    border-radius: var(--radius-medium);
    background: var(--color-ink);
    color: var(--color-white);
}

.resource-header--dark .section-label {
    color: var(--color-signal);
}

.resource-header--dark > div > p:last-child {
    color: color-mix(in oklch, var(--color-white), transparent 28%);
}

.resource-intro {
    width: min(calc(100% - 40px), var(--reading-width));
    margin: 0 auto 58px;
}

.platform-entries,
.decision-checklist,
.video-library,
.video-method {
    width: min(calc(100% - 40px), var(--content-width));
    margin-inline: auto;
}

.platform-entries {
    border-top: 1px solid var(--color-line);
}

.platform-entry {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(260px, 0.46fr);
    gap: 70px;
    align-items: center;
    padding: 48px 0;
    border-bottom: 1px solid var(--color-line);
}

.platform-entry span,
.video-library__list article > div > span {
    color: var(--color-brand-dark);
    font-size: 13px;
    font-weight: 800;
}

.platform-entry h2 {
    margin: 7px 0 12px;
    font-size: clamp(32px, 4vw, 48px);
    letter-spacing: -0.025em;
}

.platform-entry p {
    max-width: 66ch;
    margin: 0;
    color: var(--color-muted);
    font-size: 16px;
}

.platform-entry__actions {
    display: grid;
    justify-items: stretch;
    gap: 8px;
}

.decision-checklist {
    display: grid;
    grid-template-columns: 0.65fr 1.35fr;
    gap: 70px;
    padding: 90px 0 110px;
}

.decision-checklist h2,
.video-method h2 {
    margin: 0;
    font-size: clamp(32px, 4vw, 48px);
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.decision-checklist > div > p {
    margin: 14px 0 0;
    color: var(--color-muted);
}

.decision-checklist ol {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: decision;
}

.decision-checklist li {
    display: grid;
    grid-template-columns: 44px minmax(150px, 0.7fr) 1.3fr;
    gap: 18px;
    padding: 18px 0;
    border-bottom: 1px solid var(--color-line);
    counter-increment: decision;
}

.decision-checklist li::before {
    color: var(--color-brand-dark);
    font-size: 13px;
    font-weight: 800;
    content: counter(decision, decimal-leading-zero);
}

.decision-checklist li span {
    color: var(--color-muted);
}

.video-library {
    padding: 100px 0;
}

.video-library__list {
    border-top: 1px solid var(--color-line);
}

.video-library__list article {
    display: grid;
    grid-template-columns: minmax(190px, 0.6fr) minmax(0, 1fr) auto;
    gap: 34px;
    align-items: center;
    padding: 28px 0;
    border-bottom: 1px solid var(--color-line);
    scroll-margin-top: 100px;
}

.video-library__list h3 {
    margin: 5px 0 0;
    font-size: 25px;
}

.video-library__list p {
    margin: 0;
    color: var(--color-muted);
}

.video-method {
    display: grid;
    grid-template-columns: 0.7fr 1.3fr;
    gap: 70px;
    margin-bottom: 110px;
    padding: 48px;
    border-radius: var(--radius-medium);
    background: var(--color-surface);
}

.video-method > div {
    display: grid;
    justify-items: start;
    gap: 16px;
}

.video-method p {
    margin: 0;
    color: var(--color-muted);
}

.about-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    padding: 88px 0 66px;
}

.about-mark {
    width: 132px;
    height: 132px;
    font-size: 30px;
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(0, var(--reading-width)) 260px;
    gap: 70px;
    align-items: start;
    padding-bottom: 110px;
}

.about-principles {
    padding: 22px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-small);
}

.about-principles ul {
    margin: 14px 0 0;
    padding-left: 20px;
    color: var(--color-muted);
}

.error-page {
    min-height: 62vh;
    padding-top: 130px;
}

.error-page .button-row {
    margin-top: 28px;
}

@media (max-width: 1120px) {
    .site-header__inner {
        gap: 16px;
    }

    .site-nav__link,
    .nav-group summary {
        padding-inline: 6px;
        font-size: 13px;
    }

    .site-header__actions .button {
        display: none;
    }

    .topic-item {
        grid-column: span 6;
    }

    .topic-item:first-child {
        grid-column: span 6;
    }

    .topic-item:nth-child(2n) {
        border-right: 0;
    }

    .topic-item:nth-child(n + 3) {
        border-top: 1px solid var(--color-line);
    }

    .topic-item:nth-child(3) {
        border-right: 1px solid var(--color-line);
    }

    .article-layout {
        grid-template-columns: 180px minmax(0, var(--reading-width));
    }
}

@media (max-width: 920px) {
    .menu-toggle {
        display: flex;
        margin-left: auto;
    }

    .site-header__inner {
        position: relative;
        min-height: 66px;
    }

    .site-nav {
        position: absolute;
        top: calc(100% + 1px);
        right: 0;
        left: 0;
        display: none;
        max-height: calc(100vh - 82px);
        overflow-y: auto;
        padding: 12px 20px 24px;
        border-bottom: 1px solid var(--color-line);
        background: var(--color-bg);
    }

    .site-nav.is-open {
        display: grid;
        align-items: stretch;
        justify-content: stretch;
    }

    .site-nav__link,
    .nav-group summary {
        min-height: 48px;
        padding: 12px;
        font-size: 15px;
    }

    .nav-panel {
        position: static;
        width: auto;
        margin: 0 12px 10px;
        padding: 4px 0 10px 16px;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .nav-panel a {
        padding-block: 9px;
    }

    .site-header__actions {
        order: 2;
    }

    .home-hero__inner {
        grid-template-columns: 1fr;
        min-height: 0;
        padding: 70px 0 76px;
    }

    .route-map {
        max-width: 680px;
    }

    .start-strip__inner,
    .video-section,
    .learning-stage,
    .shooting-note,
    .platform-entry,
    .decision-checklist,
    .video-method,
    .about-layout {
        grid-template-columns: 1fr;
        gap: 34px;
    }

    .start-strip__links {
        justify-content: flex-start;
    }

    .latest-layout {
        grid-template-columns: 1fr;
        gap: 54px;
    }

    .video-section {
        padding: 54px 42px;
    }

    .article-layout {
        display: block;
        width: min(calc(100% - 40px), var(--reading-width));
    }

    .article-aside {
        margin-bottom: 38px;
    }

    .site-footer__inner {
        grid-template-columns: 1fr 1fr;
    }

    .site-footer__notice {
        grid-column: 1 / -1;
    }

    .learning-topic {
        grid-template-columns: 0.8fr 1.2fr;
    }

    .resource-header {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .video-library__list article {
        grid-template-columns: minmax(170px, 0.7fr) minmax(0, 1.3fr);
    }

    .video-library__list .text-link {
        grid-column: 1 / -1;
        justify-self: start;
    }
}

@media (max-width: 700px) {
    .site-header__inner,
    .home-hero__inner,
    .start-strip__inner,
    .topic-section,
    .latest-section,
    .video-section,
    .trust-section,
    .site-footer__inner,
    .article-feature,
    .page-feature,
    .article-layout,
    .article-footer,
    .page-shell,
    .page-header,
    .archive-header,
    .archive-feed,
    .learning-header,
    .resource-header,
    .resource-intro,
    .platform-entries,
    .decision-checklist,
    .video-library,
    .video-method,
    .learning-intro,
    .learning-stages,
    .shooting-note,
    .about-hero,
    .about-layout,
    .error-page {
        width: min(calc(100% - 28px), var(--content-width));
    }

    .site-header__actions .gh-search-icon {
        width: 38px !important;
        height: 38px !important;
    }

    .menu-toggle__label {
        display: none;
    }

    .home-hero__copy h1 {
        max-width: 100%;
        text-wrap: wrap;
    }

    .home-hero__lead {
        font-size: 18px;
    }

    .route-map {
        padding: 24px;
    }

    .route-map::before {
        left: 47px;
    }

    .start-strip__inner {
        grid-template-columns: 1fr;
        gap: 22px;
    }

    .start-strip__links {
        display: grid;
    }

    .start-strip__links a {
        border-radius: var(--radius-small);
    }

    .topic-section,
    .latest-section {
        padding: 72px 0;
    }

    .section-heading,
    .trust-section,
    .about-hero {
        align-items: flex-start;
        flex-direction: column;
    }

    .topic-list {
        display: block;
    }

    .topic-item,
    .topic-item:first-child {
        display: block;
        min-height: 0;
        padding: 25px 20px;
        border-top: 1px solid var(--color-line);
        border-right: 0;
    }

    .topic-item:first-child {
        border-top: 0;
    }

    .topic-item h3 {
        margin-top: 24px;
    }

    .latest-list .post-card,
    .archive-list .post-card {
        grid-template-columns: 108px minmax(0, 1fr);
        gap: 14px;
    }

    .archive-list .post-card h3 {
        font-size: 18px;
    }

    .post-card__body > p {
        display: none;
    }

    .video-section {
        padding: 38px 24px;
    }

    .video-plan {
        display: grid;
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .video-plan__primary {
        grid-row: auto;
    }

    .video-plan h3,
    .video-plan__primary h3 {
        margin-top: 28px;
        font-size: 22px;
    }

    .trust-section {
        padding-block: 74px;
    }

    .site-footer__inner {
        grid-template-columns: 1fr;
        gap: 34px;
    }

    .site-footer__notice {
        grid-column: auto;
    }

    .article-header {
        padding-top: 68px;
    }

    .article-header h1 {
        font-size: clamp(38px, 11vw, 54px);
    }

    .article-deck {
        font-size: 18px;
    }

    .article-feature,
    .page-feature {
        margin-bottom: 44px;
    }

    .gh-content {
        font-size: 16px;
    }

    .gh-content h2 {
        font-size: 28px;
    }

    .gh-content h3 {
        font-size: 23px;
    }

    .gh-content table {
        display: block;
        overflow-x: auto;
    }

    .article-next {
        grid-template-columns: 1fr;
    }

    .article-next a,
    .article-next a + a {
        padding: 22px 0;
        border-left: 0;
    }

    .article-next a + a {
        border-top: 1px solid var(--color-line);
    }

    .learning-header {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .learning-stage header {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .learning-topic {
        grid-template-columns: 1fr;
        gap: 3px;
    }

    .resource-header--dark {
        margin-top: 26px;
        padding: 34px 24px;
    }

    .platform-entry {
        gap: 28px;
        padding: 36px 0;
    }

    .decision-checklist,
    .video-library {
        padding-block: 72px;
    }

    .decision-checklist li,
    .video-library__list article {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .decision-checklist li::before {
        margin-bottom: 4px;
    }

    .video-library__list .text-link {
        grid-column: auto;
    }

    .video-method {
        padding: 32px 24px;
    }

    .shooting-note {
        padding: 32px 24px;
    }

    .about-mark {
        width: 84px;
        height: 84px;
        font-size: 22px;
    }
}

@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;
    }
}