:root {
    --canvas: #f7f7f4;
    --surface: #ffffff;
    --surface-soft: #fafaf7;
    --surface-strong: #e6e5e0;
    --hairline: #e6e5e0;
    --hairline-strong: #cfcdc4;
    --ink: #26251e;
    --body: #5a5852;
    --muted: #807d72;
    --primary: #f54e00;
    --primary-dark: #d04200;
    --mint: #9fc9a2;
    --blue: #9fbbe0;
    --lavender: #c0a8dd;
    --gold: #c08532;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 48px;
    --section: 80px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--canvas);
    color: var(--body);
    font-family: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

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

a {
    color: var(--ink);
    text-decoration-color: rgba(245, 78, 0, 0.45);
    text-underline-offset: 4px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
    outline: 3px solid rgba(245, 78, 0, 0.35);
    outline-offset: 3px;
}

h1,
h2,
h3 {
    color: var(--ink);
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin: 0;
}

h1 {
    font-size: clamp(2.25rem, 7vw, 4.5rem);
}

h2 {
    font-size: clamp(1.8rem, 4vw, 2.55rem);
}

h3 {
    font-size: clamp(1.25rem, 2.4vw, 1.55rem);
}

p {
    margin: 0;
}

.site-header {
    align-items: center;
    background: rgba(247, 247, 244, 0.94);
    border-bottom: 1px solid var(--hairline);
    display: flex;
    gap: var(--md, 16px);
    justify-content: space-between;
    min-height: 72px;
    padding: var(--space-md);
    position: sticky;
    top: 0;
    z-index: 20;
}

.brand {
    align-items: center;
    display: flex;
    gap: var(--space-sm);
    text-decoration: none;
}

.brand-mark {
    align-items: center;
    background: var(--primary);
    border-radius: var(--radius-md);
    color: #ffffff;
    display: inline-flex;
    font-weight: 700;
    height: 44px;
    justify-content: center;
    letter-spacing: -0.04em;
    width: 44px;
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    color: var(--ink);
    font-size: 0.98rem;
    line-height: 1.15;
}

.brand small {
    color: var(--muted);
    font-size: 0.78rem;
    line-height: 1.25;
    max-width: 260px;
}

.nav-toggle {
    background: var(--surface);
    border: 1px solid var(--hairline-strong);
    border-radius: var(--radius-md);
    color: var(--ink);
    min-height: 44px;
    padding: 0 var(--space-md);
}

.main-nav {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    display: none;
    left: var(--space-md);
    padding: var(--space-sm);
    position: absolute;
    right: var(--space-md);
    top: calc(100% + 8px);
}

.main-nav.open {
    display: grid;
}

.main-nav a {
    border-radius: var(--radius-md);
    min-height: 44px;
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
}

.main-nav a.active {
    background: var(--ink);
    color: var(--canvas);
}

.hero,
.article-page,
.section-wrap,
.magazine-layout,
.related-block {
    margin-inline: auto;
    max-width: 1200px;
    padding: var(--space-xxl) var(--space-md);
}

.hero {
    display: grid;
    gap: var(--space-xl);
}

.hero-copy,
.section-heading,
.article-hero,
.content-block,
.related-block,
.site-footer {
    display: grid;
    gap: var(--space-md);
}

.hero-copy > p:not(.kicker),
.section-heading p,
.article-hero p {
    max-width: 720px;
}

.kicker {
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.button-primary,
.button-secondary {
    align-items: center;
    border-radius: var(--radius-md);
    display: inline-flex;
    font-weight: 600;
    justify-content: center;
    min-height: 44px;
    padding: 10px 18px;
    text-decoration: none;
}

.button-primary {
    background: var(--primary);
    color: #ffffff;
}

.button-secondary {
    background: var(--surface);
    border: 1px solid var(--hairline-strong);
}

.image-card {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    margin: 0;
    overflow: hidden;
}

.image-card img {
    aspect-ratio: 16 / 10;
    object-fit: cover;
    width: 100%;
}

.image-card figcaption {
    color: var(--muted);
    font-size: 0.82rem;
    padding: var(--space-sm) var(--space-md);
}

.digest-grid,
.section-cards,
.related-grid,
.criteria-grid,
.service-grid,
.program-board,
.learning-path {
    display: grid;
    gap: var(--space-md);
}

.digest-card,
.section-card,
.related-card,
.criteria-grid article,
.service-grid article,
.program-board article,
.learning-path article,
.note-card,
.faq-panel,
.matrix div {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.digest-card,
.section-card > div,
.related-card,
.criteria-grid article,
.service-grid article,
.program-board article,
.learning-path article,
.note-card,
.matrix div {
    display: grid;
    gap: var(--space-sm);
}

.digest-card span,
.section-card span,
.related-card span,
.service-grid span,
.program-board span {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.lead-card {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    display: grid;
    gap: 0;
    overflow: hidden;
}

.lead-card img,
.section-card img {
    aspect-ratio: 16 / 10;
    height: 100%;
    object-fit: cover;
    width: 100%;
}

.lead-card div {
    display: grid;
    gap: var(--space-md);
    padding: var(--space-lg);
}

.section-card {
    overflow: hidden;
    padding: 0;
}

.breadcrumb {
    align-items: center;
    color: var(--muted);
    display: flex;
    flex-wrap: wrap;
    font-size: 0.9rem;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.article-page {
    padding-top: var(--space-xl);
}

.article-shell {
    display: grid;
    gap: var(--space-xl);
}

.article-hero {
    background: var(--surface-soft);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

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

.toc {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    padding: var(--space-sm);
}

.toc a {
    background: var(--surface-strong);
    border-radius: 999px;
    min-height: 40px;
    padding: 8px 14px;
    text-decoration: none;
}

.split-block {
    align-items: start;
    grid-template-columns: 1fr;
}

.check-list {
    display: grid;
    gap: var(--space-sm);
    margin: 0;
    padding-left: 1.2rem;
}

.service-grid article:nth-child(1),
.learning-path article:nth-child(1) {
    border-top: 4px solid var(--mint);
}

.service-grid article:nth-child(2),
.learning-path article:nth-child(2) {
    border-top: 4px solid var(--blue);
}

.service-grid article:nth-child(3),
.learning-path article:nth-child(3) {
    border-top: 4px solid var(--lavender);
}

.service-grid article:nth-child(4),
.learning-path article:nth-child(4) {
    border-top: 4px solid var(--gold);
}

.matrix {
    display: grid;
    gap: var(--space-sm);
}

.matrix span {
    color: var(--body);
}

.accordion-list,
.faq-panel {
    display: grid;
    gap: var(--space-sm);
}

details {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

summary {
    color: var(--ink);
    cursor: pointer;
    font-weight: 600;
    min-height: 44px;
}

details p {
    margin-top: var(--space-sm);
}

.related-card {
    text-decoration: none;
}

.site-footer {
    background: var(--ink);
    color: #f7f7f4;
    margin-top: var(--section);
    padding: var(--space-xxl) var(--space-md);
}

.site-footer h2,
.site-footer .kicker,
.site-footer a {
    color: #f7f7f4;
}

.site-footer p {
    color: #cfcdc4;
}

.site-footer nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-lg);
}

.footer-note {
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    padding-top: var(--space-md);
}

@media (min-width: 760px) {
    .site-header {
        padding-inline: var(--space-xl);
    }

    .nav-toggle {
        display: none;
    }

    .main-nav {
        align-items: center;
        background: transparent;
        border: 0;
        border-radius: 0;
        display: flex;
        gap: var(--space-xs);
        padding: 0;
        position: static;
    }

    .hero,
    .article-hero {
        grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
    }

    .digest-grid,
    .related-grid,
    .criteria-grid,
    .service-grid,
    .program-board,
    .learning-path {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .split-block {
        grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
    }

    .lead-card {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    }
}

@media (min-width: 1040px) {
    .section-cards {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .digest-grid,
    .program-board {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .site-footer {
        grid-template-columns: 1.4fr 1fr;
        padding-inline: var(--space-xxl);
    }

    .footer-note {
        grid-column: 1 / -1;
    }
}