/* assets/style.css */
:root {
    --bg: #0b1220;
    --panel: #0f1a2e;
    --card: #111f38;
    --text: #eaf0ff;
    --muted: #b9c6e6;
    --line: rgba(234, 240, 255, .12);
    --accent: #7dd3fc;
    /* 水色 */
    --accent2: #a7f3d0;
    /* ミント */
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
    --radius: 16px;
    --maxw: 1080px;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f6f8ff;
        --panel: #ffffff;
        --card: #ffffff;
        --text: #0b1220;
        --muted: #42506b;
        --line: rgba(11, 18, 32, .12);
        --shadow: 0 10px 24px rgba(19, 28, 53, .12);
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
    background: radial-gradient(1000px 500px at 10% -10%, rgba(125, 211, 252, .25), transparent 60%),
        radial-gradient(900px 450px at 90% 0%, rgba(167, 243, 208, .20), transparent 60%),
        var(--bg);
    color: var(--text);
    line-height: 1.65;
}

a {
    color: inherit;
    text-decoration: none;
}

a:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(125, 211, 252, .65);
    outline-offset: 3px;
    border-radius: 10px;
}

.container {
    width: min(var(--maxw), calc(100% - 32px));
    margin: 0 auto;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(10px);
    background: color-mix(in srgb, var(--panel) 82%, transparent);
    border-bottom: 1px solid var(--line);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    letter-spacing: .02em;
}

.brand .badge {
    font-size: 12px;
    color: color-mix(in srgb, var(--text) 72%, var(--muted));
    border: 1px solid var(--line);
    padding: 4px 10px;
    border-radius: 999px;
}

.navlinks {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: flex-end;
    font-size: 14px;
}

.navlinks a {
    padding: 8px 10px;
    border-radius: 999px;
    border: 1px solid transparent;
}

.navlinks a:hover {
    border-color: var(--line);
    background: color-mix(in srgb, var(--card) 75%, transparent);
}

@media (max-width: 640px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .brand {
        font-size: 14px;
        flex-wrap: wrap;
    }

    .brand .badge {
        font-size: 11px;
        padding: 3px 8px;
    }

    .navlinks {
        width: 100%;
        gap: 8px;
        font-size: 13px;
    }

    .navlinks a {
        padding: 6px 10px;
    }
}

.hero {
    padding: 40px 0 22px;
}

.hero .panel {
    background: linear-gradient(180deg,
            color-mix(in srgb, var(--panel) 88%, transparent),
            color-mix(in srgb, var(--panel) 96%, transparent));
    border: 1px solid var(--line);
    border-radius: calc(var(--radius) + 6px);
    box-shadow: var(--shadow);
    padding: 26px;
    overflow: hidden;
    position: relative;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: clamp(22px, 3vw, 34px);
    line-height: 1.2;
}

.hero p {
    margin: 0 0 14px;
    color: var(--muted);
    max-width: 70ch;
}

.kpi {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--card) 70%, transparent);
    font-size: 13px;
    color: color-mix(in srgb, var(--text) 80%, var(--muted));
}

.cta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--card) 70%, transparent);
    box-shadow: 0 8px 18px rgba(0, 0, 0, .15);
    font-weight: 600;
    font-size: 14px;
}

.btn.primary {
    border-color: color-mix(in srgb, var(--accent) 70%, var(--line));
    background: linear-gradient(135deg,
            color-mix(in srgb, var(--accent) 22%, var(--card)),
            color-mix(in srgb, var(--accent2) 18%, var(--card)));
}

.grid {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 16px;
    padding: 18px 0 30px;
}

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

.section {
    background: color-mix(in srgb, var(--panel) 88%, transparent);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
}

.section h2 {
    margin: 0 0 10px;
    font-size: 18px;
}

.section .sub {
    margin: 0 0 14px;
    color: var(--muted);
    font-size: 14px;
}

.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.card {
    background: color-mix(in srgb, var(--card) 82%, transparent);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.tag {
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 999px;
    border: 1px solid var(--line);
    color: color-mix(in srgb, var(--text) 80%, var(--muted));
    white-space: nowrap;
}

.meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 6px;
    color: var(--muted);
    font-size: 13px;
}

.card h3 {
    margin: 0;
    font-size: 15px;
    line-height: 1.35;
}

.card p {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.card a.link {
    display: inline-flex;
    margin-top: 10px;
    font-weight: 600;
    font-size: 14px;
    border-bottom: 1px dashed color-mix(in srgb, var(--accent) 60%, transparent);
    width: fit-content;
}

.list {
    margin: 0;
    padding-left: 18px;
    color: var(--muted);
}

.footer {
    border-top: 1px solid var(--line);
    padding: 18px 0 30px;
    color: color-mix(in srgb, var(--text) 65%, var(--muted));
    font-size: 13px;
}

.footer a {
    text-decoration: underline;
}

.small {
    font-size: 12px;
    color: var(--muted);
}