:root {
    color-scheme: light;
    --ds-text: #17332d;
    --ds-text-subtle: #3e5b53;
    --ds-text-subtlest: #617870;
    --ds-link: #0b7a69;
    --ds-link-pressed: #075e52;
    --ds-brand: #0f766e;
    --ds-brand-hovered: #115e59;
    --ds-brand-pressed: #134e4a;
    --ds-surface: #ffffff;
    --ds-surface-sunken: #f5f8f7;
    --ds-surface-raised: #ffffff;
    --ds-surface-brand: #e6fffa;
    --ds-surface-discovery: #fff7ed;
    --ds-surface-success: #e8fff5;
    --ds-surface-warning: #fff7e8;
    --ds-surface-danger: #fff0ed;
    --ds-border: #d6e1de;
    --ds-border-bold: #aebfba;
    --ds-success: #1f7a58;
    --ds-warning: #a15c00;
    --ds-danger: #b93828;
    --ds-discovery: #c56a16;
    --ds-shadow-raised: 0 1px 1px rgba(23, 51, 45, 0.13), 0 0 1px rgba(23, 51, 45, 0.12);
    --ds-shadow-overlay: 0 8px 12px rgba(23, 51, 45, 0.15), 0 0 1px rgba(23, 51, 45, 0.28);
    --radius-small: 4px;
    --radius-medium: 6px;
    --radius-large: 8px;
    --radius-xlarge: 12px;
    --page-width: 1184px;
    --content-width: 816px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 88px;
}

html[data-site-lang="ja"] [data-lang="en"],
html[data-site-lang="en"] [data-lang="ja"] {
    display: none !important;
}

body {
    background: var(--ds-surface);
    color: var(--ds-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    margin: 0;
    text-rendering: optimizeLegibility;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

a {
    color: var(--ds-link);
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

a:hover {
    color: var(--ds-link-pressed);
}

:focus-visible {
    outline: 2px solid #0f8f7f;
    outline-offset: 2px;
}

.skip-link {
    background: var(--ds-surface);
    border-radius: var(--radius-medium);
    box-shadow: var(--ds-shadow-overlay);
    left: 16px;
    padding: 8px 12px;
    position: fixed;
    top: -80px;
    z-index: 100;
}

.skip-link:focus {
    top: 16px;
}

.site-header {
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--ds-border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-shell {
    align-items: center;
    display: flex;
    gap: 24px;
    justify-content: space-between;
    margin: 0 auto;
    max-width: var(--page-width);
    min-height: 64px;
    padding: 8px 24px;
}

.brand {
    align-items: center;
    color: var(--ds-text);
    display: inline-flex;
    flex: 0 0 auto;
    font-size: 18px;
    font-weight: 700;
    gap: 10px;
    letter-spacing: -0.01em;
    text-decoration: none;
}

.brand:hover {
    color: var(--ds-text);
}

.brand-logo {
    display: block;
    height: 32px;
    width: 32px;
}

.nav-actions,
.nav-links,
.language-switcher {
    align-items: center;
    display: flex;
}

.nav-actions {
    gap: 16px;
}

.nav-links {
    gap: 4px;
}

.nav-link {
    border-radius: var(--radius-medium);
    color: var(--ds-text-subtle);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 10px;
    text-decoration: none;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
    background: var(--ds-surface-sunken);
    color: var(--ds-link);
}

.language-switcher {
    background: var(--ds-surface-sunken);
    border: 1px solid var(--ds-border);
    border-radius: var(--radius-medium);
    gap: 2px;
    padding: 2px;
}

.language-button,
.menu-button {
    border: 0;
    color: var(--ds-text-subtle);
    cursor: pointer;
    font: inherit;
}

.language-button {
    background: transparent;
    border-radius: var(--radius-small);
    font-size: 12px;
    font-weight: 600;
    min-width: 34px;
    padding: 5px 7px;
}

.language-button.is-active {
    background: var(--ds-surface);
    box-shadow: var(--ds-shadow-raised);
    color: var(--ds-link);
}

.menu-button {
    align-items: center;
    background: var(--ds-surface-sunken);
    border-radius: var(--radius-medium);
    display: none;
    height: 36px;
    justify-content: center;
    width: 36px;
}

.page-shell {
    margin: 0 auto;
    max-width: var(--page-width);
    padding-left: 24px;
    padding-right: 24px;
}

.hero {
    background:
        radial-gradient(circle at 92% 12%, rgba(245, 158, 11, 0.15), transparent 28%),
        radial-gradient(circle at 8% 88%, rgba(15, 118, 110, 0.14), transparent 28%),
        var(--ds-surface);
    border-bottom: 1px solid var(--ds-border);
    overflow: hidden;
    padding: 80px 0;
}

.hero-grid {
    align-items: center;
    display: grid;
    gap: 64px;
    grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
}

.eyebrow {
    color: var(--ds-link);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin: 0 0 12px;
    text-transform: uppercase;
}

h1,
h2,
h3 {
    letter-spacing: -0.025em;
    line-height: 1.2;
    margin-top: 0;
}

h1 {
    font-size: clamp(40px, 5vw, 56px);
    margin-bottom: 24px;
}

h2 {
    font-size: clamp(28px, 3vw, 36px);
    margin-bottom: 16px;
}

h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.hero-copy {
    color: var(--ds-text-subtle);
    font-size: 20px;
    line-height: 1.5;
    margin: 0;
    max-width: 640px;
}

.hero-actions,
.inline-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
}

.button {
    align-items: center;
    border: 1px solid transparent;
    border-radius: var(--radius-medium);
    display: inline-flex;
    font-size: 15px;
    font-weight: 600;
    justify-content: center;
    min-height: 40px;
    padding: 8px 16px;
    text-decoration: none;
}

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

.button-primary:hover {
    background: var(--ds-brand-hovered);
    color: #ffffff;
}

.button-secondary {
    background: var(--ds-surface-sunken);
    border-color: var(--ds-border);
    color: var(--ds-text);
}

.button-secondary:hover {
    background: #edf2f1;
    color: var(--ds-text);
}

.button[aria-disabled="true"] {
    cursor: not-allowed;
    opacity: 0.55;
    pointer-events: none;
}

.status-line {
    align-items: center;
    color: var(--ds-text-subtlest);
    display: flex;
    font-size: 13px;
    gap: 8px;
    margin-top: 16px;
}

.inline-actions .status-line {
    margin-top: 0;
}

.status-dot {
    background: var(--ds-discovery);
    border-radius: 999px;
    height: 8px;
    width: 8px;
}

.product-frame {
    background: var(--ds-surface-raised);
    border: 1px solid var(--ds-border);
    border-radius: var(--radius-xlarge);
    box-shadow: var(--ds-shadow-overlay);
    overflow: hidden;
}

.frame-bar {
    align-items: center;
    background: var(--ds-surface-sunken);
    border-bottom: 1px solid var(--ds-border);
    display: flex;
    gap: 6px;
    padding: 10px 12px;
}

.frame-dot {
    background: var(--ds-border-bold);
    border-radius: 50%;
    height: 7px;
    width: 7px;
}

.frame-body {
    padding: 24px;
}

.frame-heading {
    align-items: center;
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.frame-title {
    font-size: 16px;
    font-weight: 700;
}

.checkpoint {
    align-items: center;
    border: 1px solid var(--ds-border);
    border-radius: var(--radius-large);
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr auto;
    margin-top: 8px;
    padding: 14px 16px;
}

.checkpoint-title {
    font-size: 14px;
    font-weight: 600;
}

.checkpoint-meta {
    color: var(--ds-text-subtlest);
    font-size: 12px;
    margin-top: 2px;
}

.change-row {
    align-items: center;
    border-top: 1px solid var(--ds-border);
    display: grid;
    gap: 12px;
    grid-template-columns: 74px 1fr auto;
    margin-top: 20px;
    padding-top: 14px;
}

.change-name {
    font-size: 13px;
    font-weight: 600;
}

.change-meta {
    color: var(--ds-text-subtlest);
    font-size: 12px;
}

.lozenge {
    border-radius: var(--radius-small);
    display: inline-flex;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: 2px 5px;
    text-transform: uppercase;
    width: fit-content;
}

.lozenge-added {
    background: var(--ds-surface-success);
    color: var(--ds-success);
}

.lozenge-modified {
    background: var(--ds-surface-brand);
    color: var(--ds-link-pressed);
}

.lozenge-removed {
    background: var(--ds-surface-danger);
    color: var(--ds-danger);
}

.lozenge-discovery {
    background: var(--ds-surface-discovery);
    color: var(--ds-discovery);
}

.trust-strip {
    background: var(--ds-surface-sunken);
    border-bottom: 1px solid var(--ds-border);
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.trust-item {
    align-items: center;
    display: flex;
    gap: 12px;
    min-height: 88px;
    padding: 16px 24px;
}

.trust-item + .trust-item {
    border-left: 1px solid var(--ds-border);
}

.trust-icon,
.feature-icon {
    align-items: center;
    background: var(--ds-surface-brand);
    border-radius: var(--radius-large);
    color: var(--ds-link);
    display: inline-flex;
    flex: 0 0 auto;
    height: 40px;
    justify-content: center;
    width: 40px;
}

.trust-label {
    font-size: 14px;
    font-weight: 600;
}

.trust-detail {
    color: var(--ds-text-subtlest);
    font-size: 12px;
}

.section {
    padding: 80px 0;
}

.section-sunken {
    background: var(--ds-surface-sunken);
    border-bottom: 1px solid var(--ds-border);
    border-top: 1px solid var(--ds-border);
}

.section-heading {
    margin-bottom: 40px;
    max-width: 720px;
}

.section-copy {
    color: var(--ds-text-subtle);
    font-size: 18px;
    margin: 0;
}

.workflow-grid,
.feature-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(4, 1fr);
}

.workflow-card,
.feature-card,
.scope-card,
.contact-card {
    background: var(--ds-surface);
    border: 1px solid var(--ds-border);
    border-radius: var(--radius-large);
    padding: 24px;
}

.workflow-card {
    position: relative;
}

.workflow-number {
    color: var(--ds-link);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 32px;
}

.workflow-card p,
.feature-card p,
.scope-card p,
.contact-card p {
    color: var(--ds-text-subtle);
    font-size: 14px;
    margin-bottom: 0;
}

.feature-grid {
    grid-template-columns: repeat(3, 1fr);
}

.feature-card .feature-icon {
    margin-bottom: 24px;
}

.scope-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: 1fr 1fr;
}

.scope-card h3 {
    align-items: center;
    display: flex;
    gap: 10px;
}

.scope-list,
.plain-list {
    list-style: none;
    margin: 20px 0 0;
    padding: 0;
}

.scope-list li,
.plain-list li {
    color: var(--ds-text-subtle);
    padding: 8px 0 8px 28px;
    position: relative;
}

.scope-list li::before,
.plain-list li::before {
    left: 0;
    position: absolute;
    top: 8px;
}

.scope-list-in li::before {
    color: var(--ds-success);
    content: "✓";
    font-weight: 700;
}

.scope-list-out li::before {
    color: var(--ds-text-subtlest);
    content: "—";
}

.faq-list {
    border-top: 1px solid var(--ds-border);
    margin-top: 32px;
}

.faq-item {
    border-bottom: 1px solid var(--ds-border);
}

.faq-item summary {
    cursor: pointer;
    font-size: 17px;
    font-weight: 600;
    list-style: none;
    padding: 20px 40px 20px 0;
    position: relative;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    color: var(--ds-text-subtlest);
    content: "+";
    font-size: 24px;
    font-weight: 400;
    position: absolute;
    right: 8px;
    top: 14px;
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-answer {
    color: var(--ds-text-subtle);
    max-width: 760px;
    padding: 0 40px 20px 0;
}

.cta-panel {
    align-items: center;
    background: var(--ds-brand-pressed);
    border-radius: var(--radius-xlarge);
    color: #ffffff;
    display: flex;
    gap: 32px;
    justify-content: space-between;
    padding: 40px;
}

.cta-panel h2 {
    margin-bottom: 8px;
}

.cta-panel p {
    color: #b7cbc5;
    margin: 0;
}

.cta-panel .button-secondary {
    background: #ffffff;
    border-color: #ffffff;
    color: var(--ds-brand-pressed);
    flex: 0 0 auto;
}

.document-hero {
    background: var(--ds-surface-sunken);
    border-bottom: 1px solid var(--ds-border);
    padding: 56px 0 48px;
}

.document-hero .page-shell,
.document {
    max-width: calc(var(--content-width) + 48px);
}

.document-hero h1 {
    font-size: clamp(34px, 5vw, 48px);
    margin-bottom: 12px;
}

.document-meta {
    color: var(--ds-text-subtlest);
    font-size: 14px;
    margin: 0;
}

.document {
    margin: 0 auto;
    padding: 56px 24px 80px;
}

.document h2 {
    border-top: 1px solid var(--ds-border);
    font-size: 24px;
    margin: 48px 0 16px;
    padding-top: 40px;
}

.document h2:first-child {
    border-top: 0;
    margin-top: 0;
    padding-top: 0;
}

.document h3 {
    font-size: 18px;
    margin: 32px 0 8px;
}

.document p,
.document li {
    color: var(--ds-text-subtle);
}

.document ul,
.document ol {
    padding-left: 24px;
}

.document li + li {
    margin-top: 8px;
}

.callout {
    background: var(--ds-surface-brand);
    border: 1px solid #b9e9df;
    border-radius: var(--radius-large);
    margin: 24px 0;
    padding: 16px 20px;
}

.callout-warning {
    background: var(--ds-surface-warning);
    border-color: #e8a43b;
}

.callout p:last-child {
    margin-bottom: 0;
}

code {
    background: var(--ds-surface-sunken);
    border: 1px solid var(--ds-border);
    border-radius: var(--radius-small);
    color: var(--ds-text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.875em;
    padding: 1px 4px;
}

.contact-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(3, 1fr);
    margin: 24px 0;
}

.contact-card a {
    font-size: 14px;
    overflow-wrap: anywhere;
}

.site-footer {
    background: #0d2420;
    color: #b7cbc5;
    padding: 48px 0;
}

.footer-grid {
    display: grid;
    gap: 32px;
    grid-template-columns: 1.4fr 1fr 1fr;
}

.footer-brand {
    color: #ffffff;
    margin-bottom: 12px;
}

.footer-copy,
.footer-legal {
    font-size: 13px;
}

.footer-heading {
    color: #ffffff;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

.footer-links {
    display: grid;
    gap: 8px;
}

.footer-links a {
    color: #b7cbc5;
    font-size: 13px;
    text-decoration: none;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid #29443d;
    margin-top: 40px;
    padding-top: 24px;
}

.cookie-settings-button {
    background: transparent;
    border: 0;
    color: #b7cbc5;
    cursor: pointer;
    font: inherit;
    font-size: 12px;
    padding: 0;
    text-decoration: underline;
    text-decoration-color: #6e8d84;
    text-underline-offset: 3px;
}

.cookie-settings-button:hover {
    color: #ffffff;
}

.cookie-consent {
    align-items: center;
    background: var(--ds-surface-raised);
    border: 1px solid var(--ds-border);
    border-radius: var(--radius-xlarge);
    bottom: 20px;
    box-shadow: var(--ds-shadow-overlay);
    display: flex;
    gap: 24px;
    justify-content: space-between;
    left: 50%;
    max-width: 760px;
    padding: 18px 20px;
    position: fixed;
    transform: translateX(-50%);
    width: calc(100% - 32px);
    z-index: 100;
}

.cookie-consent-copy strong {
    color: var(--ds-text);
    display: block;
    font-size: 14px;
    margin-bottom: 4px;
}

.cookie-consent-copy p {
    color: var(--ds-text-subtle);
    font-size: 13px;
    margin: 0;
}

.cookie-consent-actions {
    display: flex;
    flex: 0 0 auto;
    gap: 8px;
}

.cookie-button {
    border: 1px solid transparent;
    border-radius: var(--radius-medium);
    cursor: pointer;
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    min-height: 36px;
    padding: 6px 14px;
}

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

.cookie-button-primary:hover {
    background: var(--ds-brand-hovered);
}

.cookie-button-secondary {
    background: var(--ds-surface-sunken);
    border-color: var(--ds-border);
    color: var(--ds-text);
}

.cookie-button-secondary:hover {
    background: #edf2f1;
}

.visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

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

@media (max-width: 900px) {
    .hero-grid {
        gap: 48px;
        grid-template-columns: 1fr;
    }

    .product-frame {
        margin: 0 auto;
        max-width: 600px;
        width: 100%;
    }

    .workflow-grid,
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .brand {
        order: 1;
    }

    .nav-shell {
        flex-wrap: wrap;
        gap: 8px;
    }

    .nav-actions {
        gap: 8px;
        order: 2;
    }

    .menu-button {
        display: inline-flex;
    }

    .nav-links {
        align-items: stretch;
        background: var(--ds-surface);
        border-top: 1px solid var(--ds-border);
        display: none;
        flex: 1 0 calc(100% + 48px);
        flex-direction: column;
        margin: 0 -24px -8px;
        order: 3;
        padding: 8px 24px 16px;
    }

    .nav-links.is-open {
        display: flex;
    }

    .nav-link {
        padding: 10px 8px;
    }

    .hero {
        padding: 56px 0;
    }

    h1 {
        font-size: 38px;
    }

    .hero-copy {
        font-size: 18px;
    }

    .trust-grid,
    .workflow-grid,
    .feature-grid,
    .scope-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .trust-item + .trust-item {
        border-left: 0;
        border-top: 1px solid var(--ds-border);
    }

    .section {
        padding: 56px 0;
    }

    .cta-panel {
        align-items: flex-start;
        flex-direction: column;
        padding: 32px 24px;
    }

    .document-hero {
        padding: 40px 0 32px;
    }

    .document {
        padding-bottom: 56px;
        padding-top: 40px;
    }

    .change-row {
        grid-template-columns: 74px 1fr;
    }

    .change-row > :last-child {
        display: none;
    }

    .cookie-consent {
        align-items: stretch;
        bottom: 12px;
        flex-direction: column;
        gap: 14px;
        padding: 16px;
        width: calc(100% - 24px);
    }

    .cookie-consent-actions {
        justify-content: flex-end;
    }
}