:root {
    --bg-top: #f5f8ff;
    --bg-bottom: #f8fff4;
    --ink: #122033;
    --muted: #4b5d74;
    --brand: #1373e6;
    --brand-ink: #0a3f7a;
    --card: #ffffff;
    --line: #d9e3f0;
    --ok: #0f8a54;
    --radius-lg: 18px;
    --radius-md: 12px;
    --shadow: 0 10px 28px rgba(18, 32, 51, 0.08);
}

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

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
    color: var(--ink);
    line-height: 1.6;
    background: linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
}

body.lang-ja {
    font-family: "Hiragino Sans", "Yu Gothic", "Avenir Next", sans-serif;
}

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

.page {
    width: min(980px, 92vw);
    margin: 0 auto;
    padding: 28px 0 48px;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.pill {
    display: inline-block;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 6px 12px;
    text-decoration: none;
    color: var(--brand-ink);
    background: #ffffffcc;
}

.hero {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 28px;
    background: linear-gradient(135deg, #e9f2ff, #f2ffee);
    box-shadow: var(--shadow);
}

.hero h1 {
    margin: 0 0 8px;
    line-height: 1.2;
    font-size: clamp(1.7rem, 4vw, 2.4rem);
}

.hero p {
    margin: 0 0 12px;
    color: var(--muted);
}

.tag {
    display: inline-block;
    background: #ffffffdd;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 0.9rem;
    margin: 4px 6px 0 0;
}

.section {
    margin-top: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--card);
    box-shadow: var(--shadow);
    padding: 22px;
}

.section h2 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.lead {
    color: var(--muted);
    margin-top: 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
}

.card {
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 14px;
    background: #fbfdff;
}

.card h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 1.02rem;
}

.card p,
.card li {
    color: var(--muted);
}

ul,
ol {
    padding-left: 1.2rem;
}

.footer {
    margin-top: 26px;
    color: var(--muted);
    font-size: 0.92rem;
}

.notice {
    border-left: 4px solid var(--ok);
    background: #f1fff7;
    padding: 10px 12px;
    border-radius: 8px;
}

@media (max-width: 640px) {
    .hero,
    .section {
        padding: 18px;
    }
}