:root {
    --pink: #ff4fa3;
    --bg: #f7f7fb;
    --ink: #111;
    --card: #fff;
    --border: #e9e9ef;
    --radius: 16px;
    --shadow: 0 10px 30px rgba(0, 0, 0, .07);
}

/*
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --ink: #f3f4f6;
        --card: #161920;
        --border: #262a33;
        --shadow: 0 10px 30px rgba(0, 0, 0, .4);
    }
}
*/

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    /* 斜めテキストがはみ出すのを防止 */
}

/* ===== ヘッダ ===== */
header.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: saturate(180%) blur(8px);
    background: color-mix(in srgb, var(--card), transparent);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}




h1 {
    margin: 0;
    line-height: 1;
    font-size: 60px;
    color: var(--card);
    /* 白抜き塗り */
    /* ピンク縁取り */
    -webkit-text-stroke: clamp(0.5px, 1.2vw, 1px) var(--pink);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
    font-weight: 700;
    letter-spacing: .04em;
}

.brand-mark {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--pink);
    box-shadow: inset 0 -6px 12px rgba(0, 0, 0, .15);
}

nav a {
    color: inherit;
    text-decoration: none;
    padding: 8px 10px;
    border-radius: 10px;
}

nav a:hover {
    background: color-mix(in srgb, var(--ink) 10%, transparent);
}

.spacer {
    flex: 1;
}

/* ===== 斜めの巨大テキスト（背景中央） ===== */
.hero-bg {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    pointer-events: none;
    z-index: 0;
}

.hero-text {
    font-weight: 900;
    text-align: center;
    line-height: 1;
    font-size: clamp(56px, 12vw, 220px);
    transform: rotate(-18deg);
    color: var(--card);
    /* 白抜き塗り */
    /* ピンク縁取り */
    -webkit-text-stroke: clamp(2px, 1.2vw, 1px) var(--pink);
    text-shadow:
        0 2px 0 rgba(0, 0, 0, .06),
        0 30px 60px rgba(0, 0, 0, .12);
    opacity: .1;
    /* 背景として主張しすぎない */
    user-select: none;
    white-space: nowrap;
}

/* ===== メイン ===== */
main {
    /*position: relative;*/
    z-index: 1;
    /* 背景テキストの上に置く */
    max-width: 1100px;
    margin: 0 auto;
    padding: 28px 20px 60px;
}

.lead {
    background: var(--card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    padding: 22px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
    margin-top: 18px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card h3 {
    margin: 0 0 4px;
    font-size: 1.15rem;
}

.card p {
    margin: 0;
    opacity: .85;
}

.card a.btn {
    margin-top: auto;
    display: inline-block;
    text-decoration: none;
    text-align: center;
    padding: 10px 14px;
    border: 2px solid var(--pink);
    border-radius: 12px;
    font-weight: 700;
    color: var(--ink);
}

.card a.btn:hover {
    background: color-mix(in srgb, var(--pink) 12%, transparent);
}

/* ===== フッタ ===== */
footer.site-footer {
    border-top: 1px solid var(--border);
    margin-top: 40px;
    color: #777;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px;
    font-size: .92rem;
}

/* 小さめ端末の余白調整 */
@media (max-width: 480px) {
    .header-inner {
        padding: 12px 14px;
    }

    main {
        padding: 20px 14px 44px;
    }

    .lead {
        padding: 16px;
    }

    h1 {
        font-size: 50px;
    }
}

#about {
    position: relative;
    /* 子要素の重なり調整用 */
}

#about h1 {
    position: relative;
    display: inline-block;
    margin: 0;
    line-height: 1.1;
}

#about p {
    position: absolute;
    top: 40%;
    margin: 0;
    pointer-events: none;
    /* クリック無効（装飾扱い） */
}



/* ======= 追記：最小限のスタイル ======= */
.filter-wrap {
    display: flex;
    align-items: center;
    gap: .5rem;
    margin-top: .6rem;
    flex-wrap: wrap;
}

.select-cat {
    appearance: none;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--card);
    color: var(--ink);
}

.filter-note {
    opacity: .7;
    font-size: .9rem;
}

.quiz-card.card {
    gap: 14px;
}

.question {
    background: color-mix(in srgb, var(--ink) 6%, transparent);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
    font-weight: 600;
}

.form {
    display: grid;
    gap: 10px;
}

.choice {
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    cursor: pointer;
    background: var(--card);
    transition: transform .02s ease, border-color .15s ease, background .15s ease;
}

.choice:hover {
    border-color: color-mix(in srgb, var(--ink) 20%, var(--border));
    transform: translateY(-1px);
}

.choice input[type="radio"] {
    accent-color: var(--pink);
    transform: translateY(1px);
}

.choice.correct {
    border-color: #2e7d32;
    background: color-mix(in srgb, #2e7d32 10%, var(--card));
}

.choice.wrong {
    border-color: #d32f2f;
    background: color-mix(in srgb, #d32f2f 10%, var(--card));
}

.actions {
    display: flex;
    gap: 10px;
    margin-top: 6px;
    flex-wrap: wrap;
}

.btn {
    appearance: none;
    border: 2px solid var(--pink);
    background: transparent;
    color: var(--ink);
    padding: 10px 14px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
}

.btn-primary {
    background: color-mix(in srgb, var(--pink) 16%, transparent);
}

.btn:hover {
    background: color-mix(in srgb, var(--pink) 12%, transparent);
}

.result {
    margin-top: 6px;
    font-weight: 700;
}

.result.correct {
    color: #2e7d32;
}

.result.wrong {
    color: #d32f2f;
}

.meta {
    opacity: .7;
    font-size: .92rem;
}

.warn {
    margin: .5rem 0 0;
    color: #d32f2f;
    font-size: .92rem;
}