@charset "UTF-8";

/* こどもずかん専用のデザイントークン（紙の図鑑風） */
:root {
    --zukan-paper: #f5eedf;
    --zukan-card: #fbf7ee;
    --zukan-ink: #3b3a36;
    --zukan-ink-soft: #6b675e;
    --zukan-shelf: #efe5d1;
    --zukan-accent: #e4572e;
    --zukan-accent-dark: #b9401c;
    --zukan-shadow-color: 70, 45, 20;
    --zukan-line: rgba(70, 45, 20, 0.14);
    --zukan-shadow: 0 14px 36px rgba(70, 45, 20, 0.12);
    /* 章カラーの帯（11色を等幅で並べる） */
    --zukan-chapters: linear-gradient(90deg,
        #3f7f52 0 9.0909%, #2f6fa8 9.0909% 18.1818%, #c4462a 18.1818% 27.2727%,
        #a8322e 27.2727% 36.3636%, #f2b33d 36.3636% 45.4545%, #e08a2c 45.4545% 54.5454%,
        #7fb8de 54.5454% 63.6363%, #2e7e80 63.6363% 72.7272%, #2c4a7a 72.7272% 81.8181%,
        #6a4c93 81.8181% 90.909%, #8a6242 90.909% 100%);
    --zukan-font: "Hiragino Maru Gothic ProN", "Hiragino Sans", "Yu Gothic", sans-serif;
}

/* 基本設定 */
.zukan-page .particles {
    display: none;
}

.zukan-page {
    margin: 0;
    color: var(--zukan-ink);
    background-color: var(--zukan-paper);
    background-image: radial-gradient(rgba(70, 45, 20, 0.07) 1px, transparent 1.5px);
    background-size: 22px 22px;
    font-family: var(--zukan-font);
    line-height: 1.75;
    overflow-x: hidden;
}

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

.zukan-page a {
    color: inherit;
    text-decoration: none;
}

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

.zukan-page .accent {
    color: var(--zukan-accent);
}

/* ヘッダー */
.zukan-page .site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 20;
    background: rgba(245, 238, 223, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.zukan-page .site-header::after {
    content: "";
    display: block;
    height: 6px;
    background: var(--zukan-chapters);
}

.zukan-page .site-nav {
    width: min(1120px, calc(100% - 40px));
    min-height: 70px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.zukan-page .brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 800;
    white-space: nowrap;
}

.zukan-page .brand img {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(var(--zukan-shadow-color), 0.2);
}

.zukan-page .nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
    color: var(--zukan-ink-soft);
    font-size: 0.86rem;
    font-weight: 700;
}

.zukan-page .nav-links a {
    transition: color 180ms ease;
}

.zukan-page .nav-links a:hover,
.zukan-page .nav-links a:focus-visible {
    color: var(--zukan-accent);
}

.zukan-page .language-link {
    padding: 7px 13px;
    border: 1.5px solid var(--zukan-line);
    border-radius: 999px;
    background: var(--zukan-card);
}

/* ヒーロー */
.zukan-page .hero {
    padding: 150px 20px 72px;
}

.zukan-page .hero-inner {
    width: min(1120px, 100%);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(32px, 6vw, 84px);
}

.zukan-page .hero-icon {
    width: 88px;
    height: 88px;
    margin-bottom: 22px;
    border-radius: 20px;
    box-shadow: var(--zukan-shadow);
}

.zukan-page .eyebrow,
.zukan-page .section-kicker {
    margin: 0 0 14px;
    color: var(--zukan-accent-dark);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

/* 見出しは行の長さをそろえる（非対応ブラウザでは通常の改行） */
.zukan-page h1,
.zukan-page h2,
.zukan-page h3 {
    text-wrap: balance;
}

/* 日本語の見出しは、HTML の <wbr> の位置（文節の区切り）でだけ改行する。Safari を含む全ブラウザで有効 */
.zukan-page:lang(ja) h1,
.zukan-page:lang(ja) h2,
.zukan-page:lang(ja) h3 {
    word-break: keep-all;
    /* 1文節が画面幅に収まらない場合だけ、はみ出さないよう途中で折り返す */
    overflow-wrap: anywhere;
}

.zukan-page .hero h1 {
    margin: 0;
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 900;
    line-height: 1.25;
}

.zukan-page .hero-lead {
    max-width: 560px;
    margin: 24px 0 0;
    color: var(--zukan-ink-soft);
    font-size: clamp(1rem, 1.6vw, 1.12rem);
}

.zukan-page .hero-actions {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

.zukan-page .hero-shot {
    justify-self: center;
    width: min(100%, 400px);
}

.zukan-page .hero-shot img,
.zukan-page .screenshot-card img {
    width: 100%;
    height: auto;
    aspect-ratio: 640 / 1391;
    border-radius: 22px;
    box-shadow: 0 20px 50px rgba(var(--zukan-shadow-color), 0.22);
}

.zukan-page .hero-proof {
    width: min(1120px, 100%);
    margin: 56px auto 0;
    padding: 22px 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border: 1.5px solid var(--zukan-line);
    border-radius: 22px;
    background: var(--zukan-card);
    box-shadow: var(--zukan-shadow);
}

.zukan-page .proof-item {
    padding: 0 26px;
    border-right: 1.5px dashed var(--zukan-line);
}

.zukan-page .proof-item:last-child {
    border-right: 0;
}

.zukan-page .proof-item strong {
    display: block;
    color: var(--zukan-accent);
    font-size: 1.5rem;
    font-weight: 900;
}

.zukan-page .proof-item span {
    display: block;
    color: var(--zukan-ink-soft);
    font-size: 0.84rem;
}

/* ボタン */
.zukan-page .primary-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: 999px;
    color: #fff;
    background: var(--zukan-accent);
    box-shadow: 0 6px 16px rgba(228, 87, 46, 0.32);
    font-size: 0.95rem;
    font-weight: 800;
    transition: transform 180ms ease, background-color 180ms ease;
}

.zukan-page .primary-action:hover,
.zukan-page .primary-action:focus-visible {
    background: var(--zukan-accent-dark);
    transform: translateY(-2px);
}

/* 共通セクション */
.zukan-page .content-section {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 88px 0;
}

.zukan-page .section-heading {
    max-width: 690px;
    margin-bottom: 44px;
}

.zukan-page .section-heading h2 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 2.9rem);
    font-weight: 900;
    line-height: 1.3;
}

.zukan-page .section-heading p:not(.section-kicker) {
    max-width: 600px;
    margin: 16px 0 0;
    color: var(--zukan-ink-soft);
}

/* 見る・聞く・くらべる */
.zukan-page .step-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.zukan-page .step-card {
    padding: 28px;
    border: 1.5px solid var(--zukan-line);
    border-radius: 26px;
    background: var(--zukan-card);
    box-shadow: var(--zukan-shadow);
}

.zukan-page .step-symbol {
    display: inline-block;
    margin-bottom: 18px;
    padding: 4px 14px;
    color: #fff;
    border-radius: 999px;
    background: #2f6fa8;
    font-size: 0.82rem;
    font-weight: 800;
}

.zukan-page .step-card:nth-child(2) .step-symbol {
    background: #2e7e80;
}

.zukan-page .step-card:nth-child(3) .step-symbol {
    background: #c4462a;
}

.zukan-page .step-card h3 {
    margin: 0 0 10px;
    font-size: 1.25rem;
    font-weight: 900;
}

.zukan-page .step-card p {
    margin: 0;
    color: var(--zukan-ink-soft);
    font-size: 0.93rem;
}

/* スクリーンショット */
.zukan-page .screenshots-section {
    overflow: hidden;
}

.zukan-page .screenshot-track {
    width: 100vw;
    display: flex;
    gap: 22px;
    overflow-x: auto;
    margin: 0 0 0 calc((100% - 100vw) / 2);
    padding: 10px max(20px, calc((100vw - 1120px) / 2)) 28px;
    scroll-padding-inline: max(20px, calc((100vw - 1120px) / 2));
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
    scrollbar-color: var(--zukan-accent) transparent;
}

.zukan-page .screenshot-card {
    flex: 0 0 clamp(230px, 24vw, 300px);
    scroll-snap-align: start;
}

.zukan-page .screenshot-card figure {
    margin: 0;
}

.zukan-page .screenshot-card:hover img {
    transform: translateY(-6px);
}

.zukan-page .screenshot-card img {
    transition: transform 200ms ease;
}

/* 機能一覧 */
.zukan-page .features-section {
    background: var(--zukan-shelf);
}

.zukan-page .feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.zukan-page .feature-card {
    position: relative;
    padding: 36px 28px 28px;
    overflow: hidden;
    border: 1.5px solid var(--zukan-line);
    border-radius: 26px;
    background: var(--zukan-card);
    box-shadow: var(--zukan-shadow);
}

/* 本の色帯のような章カラーの印 */
.zukan-page .feature-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 8px;
    background: var(--mark, #3f7f52);
}

.zukan-page .feature-card:nth-child(1) { --mark: #3f7f52; }
.zukan-page .feature-card:nth-child(2) { --mark: #2f6fa8; }
.zukan-page .feature-card:nth-child(3) { --mark: #c4462a; }
.zukan-page .feature-card:nth-child(4) { --mark: #f2b33d; }
.zukan-page .feature-card:nth-child(5) { --mark: #a8322e; }
.zukan-page .feature-card:nth-child(6) { --mark: #6a4c93; }

.zukan-page .feature-card h3 {
    margin: 0 0 10px;
    font-size: 1.15rem;
    font-weight: 900;
}

.zukan-page .feature-card p {
    margin: 0;
    color: var(--zukan-ink-soft);
    font-size: 0.9rem;
}

/* おうちの方へ */
.zukan-page .parents-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.zukan-page .parents-card {
    padding: 26px 28px;
    border: 1.5px solid var(--zukan-line);
    border-left: 8px solid var(--mark, #2e7e80);
    border-radius: 22px;
    background: var(--zukan-card);
    box-shadow: var(--zukan-shadow);
}

.zukan-page .parents-card:nth-child(1) { --mark: #3f7f52; }
.zukan-page .parents-card:nth-child(2) { --mark: #2f6fa8; }
.zukan-page .parents-card:nth-child(3) { --mark: #e08a2c; }
.zukan-page .parents-card:nth-child(4) { --mark: #a8322e; }
.zukan-page .parents-card:nth-child(5) { --mark: #2e7e80; }

.zukan-page .parents-card.wide {
    grid-column: 1 / -1;
}

.zukan-page .parents-card h3 {
    margin: 0 0 8px;
    font-size: 1.1rem;
    font-weight: 900;
}

.zukan-page .parents-card p {
    margin: 0;
    color: var(--zukan-ink-soft);
    font-size: 0.92rem;
}

/* ダウンロードCTA */
.zukan-page .download-section {
    padding-top: 40px;
}

.zukan-page .download-card {
    position: relative;
    overflow: hidden;
    padding: clamp(36px, 7vw, 68px);
    padding-top: clamp(44px, 7vw, 76px);
    border: 1.5px solid var(--zukan-line);
    border-radius: 32px;
    background: var(--zukan-card);
    box-shadow: var(--zukan-shadow);
    text-align: center;
}

.zukan-page .download-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 10px;
    background: var(--zukan-chapters);
}

.zukan-page .download-card h2 {
    margin: 0 auto;
    max-width: 640px;
    font-size: clamp(1.8rem, 4vw, 2.7rem);
    font-weight: 900;
    line-height: 1.3;
}

.zukan-page .download-card p {
    max-width: 560px;
    margin: 18px auto 0;
    color: var(--zukan-ink-soft);
}

.zukan-page .app-store-badge {
    display: inline-block;
    margin-top: 28px;
    transition: transform 180ms ease, opacity 180ms ease;
}

.zukan-page .app-store-badge img {
    width: 180px;
    height: auto;
}

.zukan-page .app-store-badge:hover,
.zukan-page .app-store-badge:focus-visible {
    opacity: 0.82;
    transform: translateY(-2px);
}

/* フッター */
.zukan-page .site-footer {
    padding: 36px 20px 46px;
    color: var(--zukan-ink-soft);
    text-align: center;
}

.zukan-page .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px 26px;
    margin-bottom: 18px;
    font-size: 0.84rem;
    font-weight: 700;
}

.zukan-page .footer-links a:hover,
.zukan-page .footer-links a:focus-visible {
    color: var(--zukan-accent);
}

.zukan-page .site-footer p {
    margin: 0;
    font-size: 0.76rem;
}

/* アニメーション */
@keyframes zukan-rise {
    from { opacity: 0; transform: translateY(18px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 共通スクリプトが機能カードに適用する表示アニメーション */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.zukan-page .hero-copy,
.zukan-page .hero-shot {
    animation: zukan-rise 700ms ease-out both;
}

.zukan-page .hero-shot {
    animation-delay: 120ms;
}

/* キーボード操作と縮小モーションへの対応 */
.zukan-page :focus-visible {
    outline: 3px solid #2f6fa8;
    outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
    .zukan-page *,
    .zukan-page *::before,
    .zukan-page *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}

/* タブレット・スマートフォン対応 */
@media (max-width: 820px) {
    .zukan-page .hero-inner {
        grid-template-columns: 1fr;
    }

    .zukan-page .hero-copy {
        max-width: 680px;
    }

    .zukan-page .hero-shot {
        width: min(340px, 100%);
    }

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

@media (max-width: 620px) {
    .zukan-page .site-nav {
        width: min(100% - 28px, 1120px);
        min-height: 60px;
    }

    .zukan-page .brand {
        font-size: 0.88rem;
    }

    .zukan-page .brand img {
        width: 30px;
        height: 30px;
    }

    .zukan-page .nav-links {
        gap: 10px;
        font-size: 0.75rem;
    }

    .zukan-page .nav-links a:not(.language-link) {
        display: none;
    }

    .zukan-page .hero {
        padding: 112px 16px 56px;
    }

    .zukan-page .hero-proof {
        margin-top: 40px;
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .zukan-page .proof-item {
        padding: 0 22px 14px;
        border-right: 0;
        border-bottom: 1.5px dashed var(--zukan-line);
    }

    .zukan-page .proof-item:last-child {
        padding-bottom: 0;
        border-bottom: 0;
    }

    .zukan-page .content-section {
        width: min(100% - 32px, 1120px);
        padding: 64px 0;
    }

    .zukan-page .section-heading {
        margin-bottom: 30px;
    }

    .zukan-page .step-grid,
    .zukan-page .feature-grid,
    .zukan-page .parents-grid {
        grid-template-columns: 1fr;
    }

    .zukan-page .screenshot-card {
        flex-basis: min(72vw, 270px);
    }

    .zukan-page .download-card {
        border-radius: 24px;
    }
}