:root {
    --bg: #f3f6fb;
    --panel: #ffffff;
    --panel-muted: #eef3ff;
    --text: #162033;
    --muted: #5c667b;
    --line: #d9e1f0;
    --primary: #3056d3;
    --primary-deep: #233ea3;
    --accent: #f08b38;
    --success: #198754;
    --warn: #ab5a00;
    --shadow: 0 18px 48px rgba(18, 30, 62, 0.08);
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --content-width: 1120px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top right, rgba(240, 139, 56, 0.16), transparent 30%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
    color: var(--text);
    line-height: 1.65;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

.page {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 24px 20px 60px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 24px;
    padding: 16px 18px;
    border: 1px solid rgba(48, 86, 211, 0.1);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 28px rgba(18, 30, 62, 0.05);
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.brand:hover {
    text-decoration: none;
}

.brand-logo {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(48, 86, 211, 0.18);
    flex: 0 0 auto;
}

.brand-copy {
    min-width: 0;
}

.brand-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text);
}

.brand-subtitle {
    margin: 2px 0 0;
    font-size: 0.92rem;
    color: var(--muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.nav a {
    padding: 9px 12px;
    border-radius: 999px;
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 600;
}

.nav a.is-current,
.nav a:hover {
    background: rgba(48, 86, 211, 0.12);
    color: var(--primary-deep);
    text-decoration: none;
}

.lang-switch {
    display: inline-flex;
    gap: 8px;
    padding: 6px;
    border-radius: 999px;
    background: rgba(48, 86, 211, 0.08);
}

.lang-btn {
    border: 0;
    background: transparent;
    color: var(--primary-deep);
    font: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    padding: 9px 14px;
    border-radius: 999px;
    cursor: pointer;
}

.lang-btn.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 10px 24px rgba(48, 86, 211, 0.22);
}

.panel {
    background: var(--panel);
    border: 1px solid rgba(48, 86, 211, 0.08);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 28px;
    margin-bottom: 22px;
}

.hero {
    position: relative;
    overflow: hidden;
    background:
        linear-gradient(135deg, rgba(48, 86, 211, 0.96), rgba(35, 62, 163, 0.94)),
        linear-gradient(180deg, #3158db, #243d9c);
    color: #fff;
}

.hero::after {
    content: "";
    position: absolute;
    inset: auto -40px -60px auto;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    filter: blur(4px);
}

.hero-grid {
    display: grid;
    gap: 24px;
    position: relative;
    z-index: 1;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    font-size: 0.86rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.hero h1,
.content h1 {
    margin: 14px 0 12px;
    line-height: 1.1;
    font-size: clamp(2rem, 4vw, 3.4rem);
}

.hero .lead {
    font-size: 1.08rem;
    color: rgba(255, 255, 255, 0.92);
    max-width: 760px;
    margin-bottom: 18px;
}

.badge-row,
.link-row,
.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.14);
    color: inherit;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
    border-radius: 999px;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.button.primary {
    background: #fff;
    color: var(--primary-deep);
    box-shadow: 0 12px 30px rgba(18, 30, 62, 0.2);
}

.button.secondary {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #fff;
}

.section-head {
    margin-bottom: 16px;
}

.section-kicker {
    color: var(--primary);
    font-size: 0.88rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.section-head h2,
.content h2 {
    margin: 0 0 8px;
    font-size: clamp(1.45rem, 2.5vw, 2rem);
    line-height: 1.2;
}

.section-head p,
.content p,
.content li {
    color: var(--muted);
}

.grid {
    display: grid;
    gap: 16px;
}

.grid.cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.card {
    padding: 20px;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, #ffffff 0%, #f7f9ff 100%);
    border: 1px solid rgba(48, 86, 211, 0.1);
}

.card h3,
.content h3 {
    margin: 0 0 8px;
    font-size: 1.05rem;
    line-height: 1.3;
}

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

.metric-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 12px;
}

.metric {
    padding: 16px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.14);
}

.metric-label {
    font-size: 0.84rem;
    color: rgba(255, 255, 255, 0.78);
    margin-bottom: 5px;
}

.metric-value {
    font-size: 1.05rem;
    font-weight: 800;
}

.timeline {
    display: grid;
    gap: 14px;
    counter-reset: step;
}

.timeline-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    align-items: start;
}

.timeline-item::before {
    counter-increment: step;
    content: counter(step);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 800;
    margin-top: 2px;
}

.callout {
    padding: 18px 20px;
    border-radius: 18px;
    background: var(--panel-muted);
    border: 1px solid rgba(48, 86, 211, 0.12);
}

.callout.warn {
    background: rgba(240, 139, 56, 0.12);
    border-color: rgba(240, 139, 56, 0.22);
}

.callout.success {
    background: rgba(25, 135, 84, 0.1);
    border-color: rgba(25, 135, 84, 0.22);
}

.inline-list,
.content ul,
.content ol {
    margin: 0;
    padding-left: 1.2rem;
}

.inline-list li,
.content li {
    margin-bottom: 8px;
}

.note {
    font-size: 0.93rem;
    color: var(--muted);
}

.faq {
    display: grid;
    gap: 14px;
}

.faq-item {
    padding: 18px 20px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid rgba(48, 86, 211, 0.1);
}

.faq-item strong {
    display: block;
    margin-bottom: 6px;
}

.content {
    background: var(--panel);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid rgba(48, 86, 211, 0.08);
    padding: 34px 30px;
}

.content-header {
    margin-bottom: 26px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--line);
}

.content-meta {
    color: var(--muted);
    font-size: 0.93rem;
}

.content section + section {
    margin-top: 26px;
}

.content h2 {
    padding-top: 8px;
}

.support-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 18px;
}

.footer {
    margin-top: 28px;
    padding: 20px 6px 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 10px;
}

[lang="en"] {
    display: none;
}

span[lang="ja"],
strong[lang="ja"],
a[lang="ja"],
small[lang="ja"] {
    display: inline;
}

span[lang="en"],
strong[lang="en"],
a[lang="en"],
small[lang="en"] {
    display: none;
}

body.lang-en [lang="ja"] {
    display: none;
}

body.lang-en [lang="en"] {
    display: block;
}

body.lang-en span[lang="en"],
body.lang-en strong[lang="en"],
body.lang-en a[lang="en"],
body.lang-en small[lang="en"] {
    display: inline;
}

body.lang-en span[lang="ja"],
body.lang-en strong[lang="ja"],
body.lang-en a[lang="ja"],
body.lang-en small[lang="ja"] {
    display: none;
}

@media (max-width: 900px) {
    .topbar,
    .support-grid {
        grid-template-columns: 1fr;
    }

    .metric-grid,
    .grid.cols-3,
    .grid.cols-2 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .page {
        padding: 16px 14px 48px;
    }

    .topbar {
        padding: 14px;
    }

    .panel,
    .content {
        padding: 22px 18px;
    }

    .brand {
        width: 100%;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .nav {
        width: 100%;
    }

    .nav a {
        padding-left: 0;
        padding-right: 0;
    }

    .hero h1,
    .content h1 {
        font-size: 2rem;
    }
}