@charset "UTF-8";

/* ===================================
   カラー定義
   =================================== */
:root {
    --ch-01: #30b9bf;
    --ch-02: #fe4c7f;
    --ch-03: #f87a6d;
    --ch-04: #4caf82;
    --ch-05: #516881;
    --ch-06: #a58bbf;
}

/* ===================================
   ヒーロー
   =================================== */
.ch-hero {
    width: 100%;
    background-color: #9fd9f6;
    display: flex;
    justify-content: center;
    padding: 80px 20px 60px;
}

.ch-hero-inner {
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 40px;
}

.ch-hero-chara {
    width: 160px;
    flex-shrink: 0;
}

.ch-hero-text {
    flex: 1;
}

.ch-hero-en {
    font-size: 13px;
    letter-spacing: 0.2em;
    color: #fff;
    font-weight: bold;
    margin: 0 0 8px;
}

.ch-hero-title {
    font-size: 48px;
    color: #1e3a5a;
    margin: 0 0 20px;
    letter-spacing: 0.05em;
    line-height: 1.3;
}

.ch-hero-sub {
    font-size: 16px;
    color: #516881;
    line-height: 2;
    margin: 0;
}

/* ===================================
   課題一覧
   =================================== */
.ch-list {
    width: 100%;
    background-color: #fff;
    display: flex;
    justify-content: center;
    padding: 80px 20px 100px;
}

.ch-list-inner {
    max-width: 860px;
    width: 100%;
}

/* 区切り線 */
.ch-divider {
    border: none;
    border-top: 2px dashed #d9eaf4;
    margin: 64px 0;
}

/* アイテム */
.ch-item {
    display: flex;
    align-items: flex-start;
    gap: 44px;
}

.ch-item--reverse {
    flex-direction: row-reverse;
}

/* 番号 */
.ch-item-num {
    font-size: 80px;
    font-weight: 900;
    line-height: 1;
    min-width: 100px;
    text-align: center;
    letter-spacing: -0.02em;
    padding-top: 4px;
    flex-shrink: 0;
}

.ch-item--c01 .ch-item-num { color: var(--ch-01); }
.ch-item--c02 .ch-item-num { color: var(--ch-02); }
.ch-item--c03 .ch-item-num { color: var(--ch-03); }
.ch-item--c04 .ch-item-num { color: var(--ch-04); }
.ch-item--c05 .ch-item-num { color: var(--ch-05); }
.ch-item--c06 .ch-item-num { color: var(--ch-06); }

/* 本文エリア */
.ch-item-body {
    flex: 1;
    min-width: 0;
}

.ch-item-title {
    font-size: 26px;
    font-weight: bold;
    color: #1e3a5a;
    margin: 0 0 12px;
    line-height: 1.4;
}

/* タグ */
.ch-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 0 0 16px;
}

.ch-tag {
    font-size: 12px;
    font-weight: bold;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.03em;
}

.ch-item--c01 .ch-tag { background-color: #e4f8f9; color: var(--ch-01); }
.ch-item--c02 .ch-tag { background-color: #fff0f5; color: var(--ch-02); }
.ch-item--c03 .ch-tag { background-color: #fff4f2; color: var(--ch-03); }
.ch-item--c04 .ch-tag { background-color: #edf8f2; color: var(--ch-04); }
.ch-item--c05 .ch-tag { background-color: #eef1f4; color: var(--ch-05); }
.ch-item--c06 .ch-tag { background-color: #f6f1fb; color: var(--ch-06); }

/* キャッチコピー */
.ch-item-catch {
    font-size: 17px;
    font-weight: bold;
    color: #1e3a5a;
    line-height: 1.7;
    margin: 0 0 18px;
    padding: 12px 16px;
    border-left: 4px solid #9fd9f6;
    background-color: #f5fbff;
    border-radius: 0 8px 8px 0;
}

.ch-item--c01 .ch-item-catch { border-left-color: var(--ch-01); background-color: #f0fcfc; }
.ch-item--c02 .ch-item-catch { border-left-color: var(--ch-02); background-color: #fff5f8; }
.ch-item--c03 .ch-item-catch { border-left-color: var(--ch-03); background-color: #fff6f4; }
.ch-item--c04 .ch-item-catch { border-left-color: var(--ch-04); background-color: #f2fbf6; }
.ch-item--c05 .ch-item-catch { border-left-color: var(--ch-05); background-color: #f0f3f5; }
.ch-item--c06 .ch-item-catch { border-left-color: var(--ch-06); background-color: #f8f4fd; }

/* 本文テキスト */
.ch-item-text {
    font-size: 15px;
    color: #444;
    line-height: 1.9;
    margin: 0 0 14px;
}

.ch-item-text:last-child {
    margin-bottom: 0;
}

/* 写真プレースホルダー */
.ch-item-photo {
    margin-top: 24px;
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 12px;
    overflow: hidden;
    background: #e8f4fb;
    border: 2px dashed #9fd9f6;
}

.ch-photo-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #30b9bf;
    font-size: 14px;
    font-weight: bold;
    min-height: 200px;
}

/* ===================================
   レスポンシブ
   =================================== */
@media (max-width: 860px) {
    .ch-hero-inner {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    .ch-hero-chara {
        width: 100px;
    }
    .ch-hero-title {
        font-size: 38px;
    }
}

@media (max-width: 600px) {
    .ch-hero {
        padding: 60px 20px 50px;
    }
    .ch-hero-title {
        font-size: 28px;
    }
    .ch-hero-sub {
        font-size: 14px;
    }
    .ch-list {
        padding: 60px 20px 80px;
    }
    .ch-item,
    .ch-item--reverse {
        flex-direction: column;
        gap: 12px;
    }
    .ch-item-num {
        font-size: 56px;
        min-width: unset;
    }
    .ch-item-title {
        font-size: 21px;
    }
    .ch-divider {
        margin: 48px 0;
    }
}