:root {
    --background: #f7f8fa;
    --surface-soft: #f1f4f6;
    --text: #1d2735;
    --muted: #667386;
    --shadow: 0 10px 28px rgba(15, 37, 68, 0.035);
    --radius: 14px;
    --editorial-line: rgba(15, 37, 68, 0.14);
}

body {
    background: linear-gradient(180deg, #fcfdfd 0%, var(--background) 100%);
    font-size: 16px;
    line-height: 1.72;
}

.site-header {
    background: rgba(252, 253, 253, 0.94);
    box-shadow: none;
}

.site-header__inner {
    padding-top: 14px;
    padding-bottom: 14px;
}

.site-brand__mark {
    width: 36px;
    gap: 3px;
}

.site-brand__bar { height: 4px; }
.site-brand__name { font-size: 1.02rem; }
.site-brand__tagline { font-size: 0.72rem; }

.site-nav { gap: 2px; }

.site-nav__link,
.site-utility a,
.button {
    border-radius: 8px;
}

.site-nav__link {
    padding: 7px 11px;
    font-size: 0.9rem;
    font-weight: 620;
}

.site-nav__link:hover,
.site-nav__link--current {
    background: transparent;
    box-shadow: inset 0 -2px 0 var(--understanding);
}

.site-utility a {
    padding: 7px 11px;
    background: transparent;
}

.language-switch { border-radius: 8px; }
.language-switch .language-switch__link { border-radius: 5px; }

.site-main {
    max-width: 1120px;
    padding-top: 52px;
}

.hero {
    padding: 42px 0 30px;
}

.hero--home {
    min-height: 390px;
    border-bottom: 1px solid var(--editorial-line);
}

.hero h1 {
    max-width: 900px;
    font-size: clamp(2.45rem, 5vw, 4.6rem);
    line-height: 1.02;
    letter-spacing: -0.047em;
    font-weight: 730;
}

.hero__lead {
    max-width: 790px;
    font-size: clamp(1rem, 1.45vw, 1.16rem);
    line-height: 1.65;
}

.page-title {
    max-width: 790px;
    margin-bottom: 58px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--editorial-line);
}

.page-title h1,
.section__header h2,
.section--split h2 {
    font-size: clamp(1.85rem, 3.1vw, 2.8rem);
    line-height: 1.14;
    letter-spacing: -0.032em;
    font-weight: 700;
}

.page-title p {
    max-width: 720px;
    font-size: 1.06rem;
}

.section { margin-top: 88px; }
.section--statement { margin-top: 42px; }

.section__header {
    max-width: 700px;
    margin-bottom: 34px;
}

.section--split,
.brand-interpretation {
    display: grid;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 72px;
}

.section--quiet {
    padding: 42px;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(15, 37, 68, 0.08);
    border-radius: var(--radius);
}

.brand-interpretation {
    align-items: start;
    padding: 0 0 54px;
    border-bottom: 1px solid var(--editorial-line);
}

.brand-interpretation h2 {
    max-width: 600px;
    margin: 0;
    color: var(--systems);
    font-size: clamp(1.75rem, 3vw, 2.65rem);
    line-height: 1.18;
    letter-spacing: -0.034em;
    font-weight: 700;
}

.brand-interpretation .text-block p:first-child {
    margin-top: 0;
}

.brand-interpretation--about {
    margin-top: 72px;
}

.statement {
    max-width: 900px;
    padding: 4px 0 4px 28px;
    border-left-width: 3px;
    border-radius: 0;
    background: transparent;
    font-size: clamp(1.25rem, 2.05vw, 1.7rem);
    line-height: 1.4;
    font-weight: 540;
    box-shadow: none;
}

.eyebrow,
.hero__label {
    font-size: 0.71rem;
    letter-spacing: 0.15em;
}

.text-block {
    max-width: 680px;
}

.text-block p {
    margin-top: 0;
    margin-bottom: 1.15rem;
}

.button,
button {
    padding: 9px 14px;
    font-weight: 650;
    box-shadow: none;
}

.method-line {
    margin-top: 32px;
    gap: 8px;
}

.method-line__item {
    min-height: 32px;
    padding: 4px 9px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.72);
    font-size: 0.8rem;
    font-weight: 650;
    box-shadow: none;
}

.method-line__arrow {
    font-size: 0.82rem;
    opacity: 0.68;
}

.card-grid {
    gap: 18px;
}

.card,
.system-card,
.publication-preview,
.empty-state,
.access-panel,
.principle-item {
    padding: 24px;
    border-radius: 12px;
    box-shadow: none;
}

.card--accent-research,
.card--accent-understanding,
.card--accent-architecture,
.card--accent-systems {
    border-top-width: 2px;
}

.card h3,
.system-card h3,
.publication-preview h3,
.principle-item h3 {
    font-size: 1.12rem;
    font-weight: 680;
}

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

.editorial-link {
    min-height: 300px;
    padding: 34px 30px 32px;
    border-right: 1px solid var(--editorial-line);
}

.editorial-link:last-child { border-right: 0; }

.editorial-link::before {
    content: "";
    display: block;
    width: 36px;
    height: 3px;
    margin-bottom: 28px;
    background: var(--systems);
}

.editorial-link--research::before { background: var(--research); }
.editorial-link--understanding::before { background: var(--understanding); }
.editorial-link--systems::before { background: var(--systems); }

.editorial-link h2 {
    margin: 8px 0 16px;
    color: var(--systems);
    font-size: clamp(1.35rem, 2.2vw, 1.9rem);
    line-height: 1.16;
    letter-spacing: -0.026em;
}

.editorial-link p:not(.eyebrow) {
    color: var(--muted);
}

.editorial-link a {
    display: inline-block;
    margin-top: 14px;
    font-weight: 680;
}

.method-step,
.principle-block,
.system-detail {
    padding: 28px 30px;
    border-radius: 12px;
    box-shadow: none;
}

.method-step,
.principle-block {
    grid-template-columns: 62px 1fr;
    gap: 24px;
}

.method-step__number,
.principle-block__number {
    font-size: 1.48rem;
    opacity: 0.24;
    font-weight: 740;
}

.method-step h2,
.principle-block h2 {
    font-size: clamp(1.25rem, 2.1vw, 1.9rem);
    line-height: 1.2;
    letter-spacing: -0.026em;
    font-weight: 690;
}

.method-step--observation,
.method-step--research,
.method-step--understanding,
.method-step--architecture,
.method-step--systems,
.principle-block--research,
.principle-block--understanding,
.principle-block--systems,
.system-detail--research,
.system-detail--understanding,
.system-detail--systems {
    border-left-width: 3px;
}

.system-detail__header h2 {
    font-size: clamp(1.8rem, 3vw, 2.75rem);
    line-height: 1.08;
    letter-spacing: -0.036em;
    font-weight: 710;
}

.system-detail__grid {
    gap: 30px;
}

.research-map article {
    box-shadow: none;
}

.publication-list {
    gap: 14px;
}

.publication-preview {
    border-left: 3px solid var(--research);
}

.empty-state--editorial {
    max-width: 760px;
    padding: 28px 0 0;
    border: 0;
    border-top: 1px solid var(--editorial-line);
    border-radius: 0;
    background: transparent;
}

.status-badge {
    margin-bottom: 12px;
    border-radius: 5px;
    font-weight: 650;
}

.site-footer {
    margin-top: 96px;
    background: #f3f5f7;
    border-top: 1px solid var(--editorial-line);
}

.site-footer__inner--editorial {
    display: grid;
    grid-template-columns: minmax(240px, 1.1fr) minmax(0, 1.9fr);
    gap: 72px;
    align-items: start;
}

.site-footer__brand strong {
    color: var(--systems);
    font-size: 1rem;
    letter-spacing: 0.05em;
}

.site-footer__brand p {
    margin: 8px 0 0;
}

.site-footer__brand .site-footer__statement {
    max-width: 340px;
    margin-top: 24px;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

.site-footer__nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
}

.site-footer__column {
    display: grid;
    gap: 7px;
}

.site-footer__column h3 {
    margin: 0 0 10px;
    color: var(--systems);
    font-size: 0.72rem;
    font-weight: 760;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.site-footer__column a {
    color: var(--muted);
    font-size: 0.88rem;
}

.site-footer__column a:hover {
    color: var(--systems);
}

.site-footer__meta {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    max-width: 1120px;
    margin: 0 auto;
    padding: 22px 28px 28px;
    border-top: 1px solid var(--editorial-line);
    color: var(--muted);
    font-size: 0.8rem;
}

/* Release header refinement: keeps the primary navigation on one row and keeps access/login out of Public V1. */
.site-header__inner {
    max-width: min(100%, 1320px);
    padding: 14px 32px;
    grid-template-columns: minmax(220px, 270px) minmax(0, 1fr) auto;
    gap: 20px;
}

.site-brand {
    min-width: 0;
    gap: 12px;
}

.site-brand__mark {
    width: 38px;
    gap: 3px;
}

.site-brand__bar {
    height: 5px;
}

.site-brand__name {
    font-size: 1.05rem;
    letter-spacing: 0.14em;
}

.site-brand__tagline {
    color: #56657a;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 1.15;
}

.site-nav {
    min-width: 0;
    flex-wrap: nowrap;
    justify-content: center;
    gap: 2px;
    white-space: nowrap;
}

.site-nav__link,
.site-utility > a {
    padding: 7px 10px;
    font-size: 0.88rem;
    line-height: 1.2;
}

.site-utility {
    flex-shrink: 0;
    gap: 8px;
}

.site-utility > a {
    display: none;
    border: 0;
    background: transparent;
    color: var(--muted);
}

.site-utility > a:hover,
.site-utility > a:focus-visible {
    color: var(--systems);
    background: var(--surface-soft);
}

.language-switch {
    border-radius: 12px;
}

.language-switch .language-switch__link {
    padding: 5px 8px;
    line-height: 1.15;
}

@media (max-width: 1180px) {
    .site-header__inner {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .site-nav {
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .site-utility {
        justify-content: flex-start;
        flex-wrap: wrap;
    }
}

@media (max-width: 960px) {
    .site-main { padding-top: 36px; }
    .hero { padding-top: 30px; }
    .hero--home { min-height: 340px; }
    .hero h1 { font-size: clamp(2.25rem, 10vw, 3.65rem); }
    .section { margin-top: 64px; }
    .section--split,
    .brand-interpretation { gap: 34px; }
    .section--quiet { padding: 30px; }
    .editorial-links { grid-template-columns: 1fr; }
    .editorial-link {
        min-height: auto;
        border-right: 0;
        border-bottom: 1px solid var(--editorial-line);
    }
    .editorial-link:last-child { border-bottom: 0; }
    .site-footer__inner--editorial {
        grid-template-columns: 1fr;
        gap: 42px;
    }
}

@media (max-width: 680px) {
    .site-main { padding-left: 18px; padding-right: 18px; }
    .hero--home { min-height: auto; }
    .hero h1 { font-size: clamp(2.1rem, 12vw, 3.2rem); }
    .method-line__arrow { display: none; }
    .method-line { align-items: stretch; }
    .method-line__item { width: 100%; justify-content: center; }
    .section--quiet { padding: 24px 20px; }
    .section--split,
    .brand-interpretation { grid-template-columns: 1fr; }
    .brand-interpretation { padding-bottom: 38px; }
    .method-step,
    .principle-block { grid-template-columns: 1fr; }
    .site-footer__nav { grid-template-columns: 1fr; gap: 28px; }
    .site-footer__meta {
        flex-direction: column;
        padding-left: 18px;
        padding-right: 18px;
    }
}