/* ==========================================================
   学習アプリ枠 (VIETCAFE オンラインスタディ) の共通デザイン
   - 配色は VIETCAFE ブランド色 (DESIGN_GUIDE.md: 緑 #376439 / 青 #6FBEDB / オレンジ #F29C38、
     コース色 #cc973d / #9c2742) を基準にする。他社アプリの配色・文言に寄せないこと (2026-09-27 判断)
   - header.php / footer.php で $studyAppShell = true のページだけに適用される
   - ページ固有のスタイルは study_app_*.css に分ける
   ========================================================== */

:root {
    --sa-green: #376439;
    --sa-green-light: #4f8a52;
    --sa-green-dark: #264a28;
    --sa-brand: #376439;
    --sa-brand-dark: #264a28;
    --sa-blue: #3a93b5;
    --sa-blue-dark: #2b7896;
    --sa-orange: #f29c38;
    --sa-orange-dark: #d27f1f;
    --sa-red: #d9534f;
    --sa-red-dark: #b8413d;
    --sa-purple: #9c2742;
    --sa-purple-dark: #761c31;
    --sa-yellow: #cc973d;
    --sa-text: #3c3c3c;
    --sa-muted: #777;
    --sa-line: #e5e5e5;
    --sa-bg: #fff;
    --sa-soft: #f7f7f7;
    --sa-ok-bg: #e6f0e6;
    --sa-ng-bg: #fbe7e6;
    --sa-radius: 16px;
    --sa-side-w: 240px;
    --sa-bar-h: 60px;
    --sa-tab-h: 64px;
    --sa-font: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
}

body.study-app {
    background: var(--sa-bg);
    color: var(--sa-text);
    font-family: var(--sa-font);
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

body.study-app a { text-decoration: none; }
body.study-app *, body.study-app *::before, body.study-app *::after { box-sizing: border-box; }

/* ---------- 上部バー ---------- */
.sa-topbar {
    /* sticky はサイト共通CSSの影響で効かないことがあるため fixed にし、本文側で高さ分を空ける */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    height: var(--sa-bar-h);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    background: #fff;
    border-bottom: 2px solid var(--sa-line);
}
.sa-topbar-logo img { height: 28px; display: block; }
.sa-topbar-title {
    flex: 1;
    font-size: 17px;
    font-weight: 800;
    color: var(--sa-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sa-topbar-actions { display: flex; align-items: center; gap: 8px; }
.sa-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    color: var(--sa-muted);
    transition: background .15s;
}
.sa-icon-btn:hover { background: var(--sa-soft); color: var(--sa-text); }
.sa-icon-btn .material-symbols-outlined { font-size: 26px; }
/* 会員アイコン (サイト共通ヘッダーと同じ /show_profile_image.php の丸アイコン) */
.sa-avatar { display: inline-flex; padding: 4px; border-radius: 50%; }
.sa-avatar > span {
    display: block;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--sa-soft);
    background-size: cover;
    background-position: center;
    /* サイト共通の写真枠 (.avatar-ring-sm) と同じ白+グレーの二重リング */
    box-shadow: 0 0 0 2px #fff, 0 0 0 3px #e5e5e5;
}
.sa-avatar:hover > span { box-shadow: 0 0 0 2px #fff, 0 0 0 3px #9cc59e; }
.sa-login-link {
    font-weight: 800;
    font-size: 14px;
    color: var(--sa-blue);
    padding: 8px 12px;
}

/* ---------- レイアウト (PCは左サイドバー、スマホは下部タブ) ---------- */
.sa-layout { display: flex; min-height: calc(100vh - var(--sa-bar-h)); padding-top: var(--sa-bar-h); }
.sa-side {
    position: sticky;
    top: var(--sa-bar-h);
    align-self: flex-start;
    width: var(--sa-side-w);
    height: calc(100vh - var(--sa-bar-h));
    padding: 20px 12px;
    border-right: 2px solid var(--sa-line);
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex-shrink: 0;
}
.sa-nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 14px;
    border-radius: 12px;
    border: 2px solid transparent;
    color: var(--sa-muted);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: .02em;
    transition: background .15s;
}
.sa-nav-item:hover { background: var(--sa-soft); color: var(--sa-text); }
.sa-nav-item.is-active {
    background: #eaf3ea;
    border-color: #9cc59e;
    color: var(--sa-brand);
}
.sa-nav-item .sa-nav-icon {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    flex-shrink: 0;
}
.sa-nav-item .sa-nav-icon .material-symbols-outlined { font-size: 22px; }
.sa-nav-item .sa-nav-icon.c-green { background: var(--sa-green); }
.sa-nav-item .sa-nav-icon.c-blue { background: var(--sa-blue); }
.sa-nav-item .sa-nav-icon.c-orange { background: var(--sa-orange); }
.sa-nav-item .sa-nav-icon.c-purple { background: var(--sa-purple); }
.sa-nav-item .sa-nav-icon.c-red { background: var(--sa-red); }
.sa-nav-item .sa-nav-icon.c-gold { background: #cc973d; }
.sa-nav-item .sa-nav-icon.c-teal { background: #2e8b7a; }
.sa-nav-item .sa-nav-icon.c-olive { background: #7a9a3a; }
.sa-nav-item .sa-nav-icon.c-gray { background: #afafaf; }
.sa-side-spacer { flex: 1; }

.sa-main {
    flex: 1;
    min-width: 0;
    padding: 24px 24px 48px;
}
/* 大きい画面で中央に細く寄らないよう、ホーム (sh-wrap) と同じ 1440px まで広げる */
.sa-container { max-width: 1440px; margin: 0 auto; }
.sa-container.is-narrow { max-width: 720px; }

.sa-tabbar { display: none; }

@media (max-width: 900px) {
    .sa-side { display: none; }
    .sa-main { padding: 16px 16px calc(var(--sa-tab-h) + 24px); }
    .sa-tabbar {
        display: flex;
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 60;
        height: var(--sa-tab-h);
        padding-bottom: env(safe-area-inset-bottom);
        background: #fff;
        border-top: 2px solid var(--sa-line);
    }
    .sa-tab {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        color: #afafaf;
        font-size: 10px;
        font-weight: 800;
    }
    .sa-tab .material-symbols-outlined { font-size: 28px; }
    .sa-tab.is-active { color: var(--sa-blue); }
    .sa-tab.is-active .material-symbols-outlined { font-variation-settings: 'FILL' 1; }
    .sa-topbar-title { font-size: 16px; }
}

/* ---------- ボタン (下辺の影でDuolingo風の立体感) ---------- */
.sa-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    padding: 0 26px;
    border: 0;
    border-radius: 999px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 800;
    letter-spacing: .04em;
    color: #fff;
    background: var(--sa-green);
    box-shadow: 0 2px 6px rgba(0, 0, 0, .12);
    cursor: pointer;
    transition: filter .1s, transform .05s, box-shadow .05s;
    -webkit-tap-highlight-color: transparent;
}
.sa-btn:hover { filter: brightness(1.05); color: #fff; }
.sa-btn:active { transform: translateY(1px); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.sa-btn.is-block { display: flex; width: 100%; }
.sa-btn.is-blue { background: var(--sa-blue); box-shadow: 0 2px 6px rgba(0, 0, 0, .12); }
.sa-btn.is-blue:active { box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.sa-btn.is-orange { background: var(--sa-orange); box-shadow: 0 2px 6px rgba(0, 0, 0, .12); }
.sa-btn.is-orange:active { box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.sa-btn.is-red { background: var(--sa-red); box-shadow: 0 2px 6px rgba(0, 0, 0, .12); }
.sa-btn.is-red:active { box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.sa-btn.is-ghost {
    background: #fff;
    color: var(--sa-blue);
    border: 2px solid var(--sa-line);
    box-shadow: 0 2px 6px rgba(0, 0, 0, .12);
}
.sa-btn.is-ghost:hover { background: var(--sa-soft); color: var(--sa-blue); }
.sa-btn.is-ghost:active { box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.sa-btn[disabled], .sa-btn.is-disabled {
    background: var(--sa-line);
    color: #afafaf;
    box-shadow: 0 2px 6px rgba(0, 0, 0, .12);
    cursor: default;
    filter: none;
    transform: none;
}
.sa-btn.is-sm { min-height: 38px; padding: 0 18px; font-size: 13px; }

/* ---------- カード・見出し ---------- */
.sa-card {
    background: #fff;
    border: 2px solid var(--sa-line);
    border-radius: var(--sa-radius);
    padding: 20px;
}
.sa-card + .sa-card { margin-top: 16px; }
/* グリッドに並べたカードには縦の間隔を足さない (段差の原因になる) */
.sa-grid-2 > .sa-card + .sa-card, .sa-grid-3 > .sa-card + .sa-card, .vw-list > .sa-card + .sa-card { margin-top: 0; }
.sa-h1 { font-size: 26px; font-weight: 900; margin: 0 0 6px; color: var(--sa-text); }
.sa-h2 { font-size: 20px; font-weight: 900; margin: 0 0 12px; color: var(--sa-text); }
.sa-lead { color: var(--sa-muted); font-size: 15px; margin: 0 0 20px; }
.sa-section { margin-top: 28px; }
.sa-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
    background: var(--sa-soft);
    color: var(--sa-muted);
}
.sa-pill.is-premium { background: #fbf2e3; color: #8a6424; }
.sa-pill.is-new { background: #e8f5fa; color: var(--sa-blue-dark); }
.sa-pill.is-free { background: #eaf3ea; color: var(--sa-green-dark); }
.sa-pill.is-paid { background: #fbe7e6; color: var(--sa-red-dark); }

/* ---------- 進捗バー ---------- */
.sa-progress {
    height: 12px;
    border-radius: 999px;
    background: var(--sa-line);
    overflow: hidden;
}
.sa-progress > span {
    display: block;
    height: 100%;
    border-radius: 999px;
    background: var(--sa-green-light);
    transition: width .35s ease;
}

/* ---------- 選択肢ボタン (クイズ共通) ---------- */
.sa-choice {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    min-height: 56px;
    padding: 12px 16px;
    margin: 0 0 12px;
    border: 2px solid var(--sa-line);
    border-radius: 14px;
    background: #fff;
    color: var(--sa-text);
    font-family: inherit;
    font-size: 17px;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    transition: background .1s, border-color .1s, transform .05s;
    -webkit-tap-highlight-color: transparent;
}
.sa-choice:hover { background: var(--sa-soft); }
.sa-choice:active { transform: translateY(1px); }
.sa-choice .sa-choice-no {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: 2px solid var(--sa-line);
    border-radius: 8px;
    color: #afafaf;
    font-size: 14px;
    font-weight: 800;
    flex-shrink: 0;
}
.sa-choice.is-selected { background: #e8f5fa; border-color: #9fd3e7; color: var(--sa-blue-dark); }
.sa-choice.is-selected .sa-choice-no { border-color: #9fd3e7; color: var(--sa-blue-dark); }
.sa-choice.is-correct { background: var(--sa-ok-bg); border-color: #9cc59e; color: var(--sa-green-dark); }
.sa-choice.is-wrong { background: var(--sa-ng-bg); border-color: #efb8b5; color: var(--sa-red-dark); }
.sa-choice[disabled] { cursor: default; }

/* ---------- 単語チップ (並び替え) ---------- */
.sa-chip-line {
    min-height: 64px;
    padding: 10px 0;
    border-bottom: 2px solid var(--sa-line);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-content: flex-start;
}
.sa-chip-line + .sa-chip-line { border-top: 0; }
.sa-chip-bank { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 24px; }
.sa-chip {
    padding: 10px 14px;
    border: 2px solid var(--sa-line);
    border-radius: 12px;
    background: #fff;
    color: var(--sa-text);
    font-family: inherit;
    font-size: 17px;
    font-weight: 700;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.sa-chip:hover { background: var(--sa-soft); }
.sa-chip.is-used { background: var(--sa-line); color: transparent; border-color: var(--sa-line); cursor: default; }

/* ---------- 回答後のフィードバック帯 (画面下から出る) ---------- */
.sa-feedback {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    padding: 20px 16px calc(20px + env(safe-area-inset-bottom));
    transform: translateY(100%);
    transition: transform .25s ease;
}
.sa-feedback.is-show { transform: translateY(0); }
.sa-feedback.is-ok { background: var(--sa-ok-bg); }
.sa-feedback.is-ng { background: var(--sa-ng-bg); }
.sa-feedback-inner {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.sa-feedback-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.sa-feedback-icon .material-symbols-outlined { font-size: 36px; font-weight: 700; }
.sa-feedback.is-ok .sa-feedback-icon .material-symbols-outlined { color: var(--sa-green); }
.sa-feedback.is-ng .sa-feedback-icon .material-symbols-outlined { color: var(--sa-red); }
.sa-feedback-text { flex: 1; min-width: 200px; }
.sa-feedback-title { font-size: 22px; font-weight: 900; }
.sa-feedback.is-ok .sa-feedback-title { color: var(--sa-green-dark); }
.sa-feedback.is-ng .sa-feedback-title { color: var(--sa-red-dark); }
.sa-feedback-answer { font-size: 15px; margin-top: 4px; }
.sa-feedback.is-ok .sa-feedback-answer { color: var(--sa-green-dark); }
.sa-feedback.is-ng .sa-feedback-answer { color: var(--sa-red-dark); }
.sa-feedback .sa-btn { min-width: 160px; }

/* ---------- ユーティリティ ---------- */
.sa-muted { color: var(--sa-muted); }
.sa-center { text-align: center; }
.sa-mt { margin-top: 16px; }
.sa-mt-lg { margin-top: 28px; }
.sa-flex { display: flex; align-items: center; gap: 12px; }
.sa-between { justify-content: space-between; }
.sa-grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.sa-grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 700px) {
    .sa-grid-3 { grid-template-columns: minmax(0, 1fr); }
    .sa-grid-2 { grid-template-columns: minmax(0, 1fr); }
    .sa-h1 { font-size: 22px; }
}

/* 学習アプリ枠では、サイト共通の浮きバナー (無料体験/マイページ・ログアウト/Messenger) を出さない */
body.study-app .floating-bnr_area,
body.study-app .floating-bnr-sp_area,
body.study-app .messenger-area { display: none !important; }

/* ---------- 出題中の画面 ($studyAppLesson): ナビを隠し、閉じるボタン+進捗バーだけにする ---------- */
body.study-app.is-lesson .sa-topbar,
body.study-app.is-lesson .sa-side,
body.study-app.is-lesson .sa-tabbar { display: none; }
body.study-app.is-lesson .sa-layout { padding-top: 0; }
body.study-app.is-lesson .sa-main { padding: 0 16px 160px; }
.sa-lesson-head {
    position: sticky;
    top: 0;
    z-index: 40;
    background: #fff;
    display: flex;
    align-items: center;
    gap: 16px;
    max-width: 880px;
    margin: 0 auto;
    padding: 20px 0 16px;
}
.sa-lesson-close {
    display: inline-flex;
    color: #afafaf;
    flex-shrink: 0;
}
.sa-lesson-close .material-symbols-outlined { font-size: 30px; }
.sa-lesson-close:hover { color: var(--sa-muted); }
.sa-lesson-head .sa-progress { flex: 1; }
.sa-lesson-body { max-width: 640px; margin: 24px auto 0; }
.sa-lesson-foot {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 65;
    background: #fff;
    border-top: 2px solid var(--sa-line);
    padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
}
.sa-lesson-foot-inner {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}
.sa-lesson-foot .sa-btn { min-width: 160px; }
@media (max-width: 700px) {
    .sa-lesson-foot .sa-btn { flex: 1; min-width: 0; }
    .sa-feedback-inner { gap: 12px; }
    .sa-feedback-icon { width: 44px; height: 44px; }
    .sa-feedback-icon .material-symbols-outlined { font-size: 28px; }
    .sa-feedback-text { flex: 1 1 calc(100% - 60px); min-width: 0; }
    .sa-feedback-title { font-size: 19px; }
    .sa-feedback .sa-btn { flex: 1 1 100%; min-width: 0; }
}

/* common.css の `nav { margin: auto 0 auto auto; width: max-content; }` がサイドバー/下部タブにも効いて
   縦長ページでサイドバーが下にずれるため打ち消す */
body.study-app nav.sa-side { margin: 0; width: var(--sa-side-w); }
body.study-app nav.sa-tabbar { margin: 0; width: auto; }

/* 大きい画面では、単語カード・受験履歴・レベル選択などの縦一列の一覧を複数列に並べる */
@media (min-width: 1100px) {
    body.study-app .vw-list,
    body.study-app .sx-history {
        grid-template-columns: repeat(auto-fill, minmax(440px, 1fr));
        align-items: start;
    }
}
@media (min-width: 1100px) {
    /* 例文クイズのレベルは4つなので 2×2 に */
    body.study-app .sq-bands { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
}
@media (min-width: 1500px) {
    body.study-app .sx-levels { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}