/*
 * ==========================================================
 * ★★★ thread.html 専用 モダンデザイン スタイルシート ★★★
 * ==========================================================
 */

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

/* --- 変数定義 --- */
:root {
    --font-modern: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans CJK JP', 'Noto Sans JP', sans-serif;
    --text-color: #212529;
    --text-color-secondary: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --link-color: #007bff;
    --link-hover-color: #0056b3;
    --post-name-color: #28a745;
    --post-meta-color: #6c757d;
    --button-radius: 8px;
    --line-bg: #c5dce7;
    --line-my-bubble-bg: #8de041;
    --line-other-bubble-bg: #fff;
}

/* --- 基本レイアウト --- */
body {
    margin: 0;
    font-family: var(--font-modern);
}
main {
    display: flex;
    flex-direction: column;
    height: 100%; /* ← '100vh' から '100%' に変更 */
    overflow: hidden;
}
body.line-theme-active {
    background-color: var(--line-bg);
}

/*
 * ==========================================================
 * ★★★ ヘッダーバー と タブデザイン ★★★
 * ==========================================================
 */
#header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 8px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0; /* ヘッダーバーが縮まないようにする */
    gap: 16px; /* タブとアイコンの間に最低限の余白を確保 */
}

#header-icons {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0; /* アイコン群が縮まないようにする */
}

#tab-container {
    display: flex;
    align-items: flex-end;
    flex-grow: 1; /* 利用可能なスペースをすべて使う */
    min-width: 0; /* flexアイテムが縮小できるようにする */
}

/* --- 各タブのスタイル --- */
.tab {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    font-size: 14px;
    color: #495057;
    background-color: transparent; /* ▼▼▼【修正】背景色を削除 ▼▼▼ */
    border: 1px solid transparent;
    border-bottom: none;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s, color 0.2s;
    margin-top: 5px;

    /* ▼▼▼【修正】タブの伸縮に関する設定 ▼▼▼ */
    flex-shrink: 1; /* コンテナが狭い場合に縮むことを許可 */
    flex-grow: 0;   /* コンテナが広い場合に伸びない */
    min-width: 60px; /* 最小幅。これ以上は縮まない */
    max-width: 200px; /* 最大幅。これ以上は伸びない */
    white-space: nowrap; /* タブ内でのテキスト改行を防ぐ */
}

.tab:hover {
    background-color: #e9ecef;
    color: #212529;
}

.tab.active {
    background-color: #ffffff;
    color: var(--accent-color);
    font-weight: 600;
    border-color: var(--border-color);
    margin-bottom: -1px; 
    padding-bottom: 9px;
    z-index: 2;
    flex-shrink: 0; /* アクティブなタブは縮みにくくする */
}
.tab.active:hover {
    background-color: #ffffff;
}

.tab-title {
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 8px;
}

.close-tab-btn {
    border: none; background: none; cursor: pointer; font-size: 18px; padding: 0;
    width: 20px; height: 20px; line-height: 20px; text-align: center;
    border-radius: 50%; color: #6c757d; flex-shrink: 0; opacity: 0.5;
    transition: all 0.2s;
}
.tab:hover .close-tab-btn { opacity: 1; }
.close-tab-btn:hover { background-color: rgba(0,0,0,0.1); color: #212529; }

#add-tab-btn {
    border: none; background: none; cursor: pointer; width: 28px; height: 28px;
    margin-left: 4px; border-radius: 6px; font-size: 20px; color: #495057;
    flex-shrink: 0; display: flex; align-items: center; justify-content: center;
    transition: background-color 0.2s;
}
#add-tab-btn:hover { background-color: #dee2e6; }


/*
 * ==========================================================
 * ★★★ コンテンツ表示エリアのレイアウト ★★★
 * ==========================================================
 */
#tab-info-display {
    background-color: #fff;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    overflow: hidden;
}

.view {
    width: 100%; 
    flex-grow: 1;
    display: none;
    flex-direction: column;
    background-color: #fff;
    overflow: hidden;
}
#posts-view {
    display: flex; /* JavaScriptでの指定をCSSでも明記 */
    flex-direction: column; /* 縦並びのFlexboxコンテナにする */
    height: 100%; /* 親要素(tab-info-display)の高さに合わせる */
}

/*
 * ============================================
 * ★★★ モダンなホーム画面 ★★★
 * ============================================
 */
#home-view {
    display: flex;
    flex-direction: column;
}
#home-content-wrapper {
    flex-grow: 1;
    overflow-y: auto;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.home-section {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.home-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.home-section-title {
    font-size: 1.2em;
    font-weight: 700;
    margin: 0;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--accent-color);
    display: inline-block;
}
.home-section-link {
    font-size: 0.9em; color: var(--link-color); text-decoration: none; font-weight: 500;
    cursor: pointer; background: none; border: none; padding: 4px;
}
.home-section-link:hover { color: var(--link-hover-color); text-decoration: underline; }
.home-menu { margin-top: 8px; }
.home-link-btn {
    padding: 12px 24px; border-radius: var(--button-radius); cursor: pointer;
    font-size: 1.1em; font-weight: 500; transition: background-color 0.2s;
    width: 100%; background-color: #f8f9fa; color: var(--text-color);
    border: 1px solid var(--border-color);
}
.home-link-btn:hover { background-color: #e9ecef; border-color: #ced4da; }
.genre-link-btn { padding: 12px; font-size: 1em; }
.others-menu { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
#home-freeboard-list { display: flex; flex-direction: column; gap: 8px; }
.home-thread-item {
    display: flex; justify-content: space-between; align-items: center; padding: 12px;
    border-radius: var(--button-radius); cursor: pointer; transition: background-color 0.2s;
    border: 1px solid transparent;
}
.home-thread-item:hover { background-color: #f0f2f5; border-color: var(--border-color); }
.home-thread-title {
    font-size: 1em; color: var(--text-color); white-space: nowrap;
    overflow: hidden; text-overflow: ellipsis; padding-right: 16px;
}
.home-thread-meta { font-size: 0.85em; color: var(--text-color-secondary); flex-shrink: 0; }


/* --- ▼▼▼【削除】ヘッダー関連のスタイルをすべて削除 --- */
/* .posts-view-header {...} */
/* .posts-view-header h2 {...} */
/* .posts-view-header .navigation-bar {...} */
/* --- ▲▲▲ ここまで ▲▲▲ --- */


/* --- ヘッダー右側のボタンのスタイル --- */
#freeboard-list-back-btn, #freeboard-create-cancel-btn {
    font-size: 0.8em; padding: 6px 12px; background-color: #f0f2f5;
    color: #333; border: 1px solid #ddd; border-radius: var(--button-radius);
    cursor: pointer; white-space: nowrap; transition: background-color 0.2s;
}
#freeboard-list-back-btn:hover, #freeboard-create-cancel-btn:hover { background-color: #e4e6eb; }
#freeboard-create-new-btn {
    font-size: 0.8em; padding: 6px 12px; background-color: var(--accent-color);
    color: white; border: 1px solid var(--accent-color); border-radius: var(--button-radius);
    cursor: pointer; white-space: nowrap; transition: background-color 0.2s;
}
#freeboard-create-new-btn:hover { background-color: var(--link-hover-color); border-color: var(--link-hover-color); }
.illustration-icon-btn {
    width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center;
    padding: 6px; border-radius: 50%; cursor: pointer; background-color: transparent;
    border: none; color: var(--text-color-secondary); transition: all 0.2s;
}
.illustration-icon-btn:hover { background-color: #e9ecef; color: var(--text-color); }
.illustration-icon-btn svg { width: 22px; height: 22px; }
.illustration-icon-btn.active { color: var(--accent-color); background-color: #e6f2ff; }

/* デフォルトでは「閉じた鍵」を非表示にし、「開いた鍵」を表示する */
.hook-closed {
    display: none;  /* 閉じたフックを隠す */
}
.hook-open {
    display: block; /* 開いたフックを見せる */
}

/* .lockedクラスが付与された状態（固定時） */
.illustration-icon-btn.locked .hook-open {
    display: none;  /* 開いたフックを隠す */
}
.illustration-icon-btn.locked .hook-closed {
    display: block; /* 閉じたフックを見せる */
}

/* --- 投稿コンテナ --- */
#posts-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column-reverse;
    min-height: 0; /* ← この一行を追加 */
}
.no-posts-message, .loading-message, .error-message { text-align: center; color: var(--text-color-secondary); padding: 20px; }


/* --- モダン5ch風 (デフォルト) --- */
.post { padding-bottom: 12px; margin-bottom: 12px; border-bottom: 1px solid var(--border-color); }
.post-header { display: flex; justify-content: space-between; align-items: center; font-size: 0.9em; color: var(--post-meta-color); margin-bottom: 6px; }
.post-author { color: var(--post-name-color); font-weight: 700; }
.post-author-line { display: none; }
.post-body { line-height: 1.7; white-space: pre-wrap; word-wrap: break-word; }
.post-date-line { display: none; }
.post-form-wrapper { padding: 16px; border-top: 1px solid var(--border-color); background-color: #fff; flex-shrink: 0; }
h3 { font-size: 1em; font-weight: 600; margin: 0 0 12px 0; border: none; padding: 0; }
#new-post-form { display: flex; flex-direction: column; gap: 8px; }
#new-post-form input, #new-post-form textarea { padding: 10px; border: 1px solid #ccc; border-radius: var(--button-radius); font-size: 1em; font-family: var(--font-modern); resize: vertical; }
#new-post-form textarea { min-height: 40px; }
#new-post-form button { align-self: flex-end; padding: 8px 16px; background-color: var(--accent-color); color: white; border: none; border-radius: var(--button-radius); font-weight: 600; cursor: pointer; }
#new-post-form button:disabled { background-color: #a0a3a7; cursor: not-allowed; }


/* --- LINE風 (.line-theme) --- */
.line-theme { background-color: var(--line-bg); }
.line-theme #posts-container { background-color: transparent; padding: 16px 10px; gap: 16px; }
/* ▼▼▼【削除】LINEテーマのヘッダースタイルを削除 ▼▼▼ */
/* .line-theme .posts-view-header { ... } */
/* .line-theme .posts-view-header h2 { ... } */
.line-theme .post { display: flex; flex-direction: column; padding: 0; margin: 0; max-width: 80%; width: fit-content; border: none; }
.line-theme .post.my-post { align-self: flex-end; align-items: flex-end; }
.line-theme .post.other-post { align-self: flex-start; align-items: flex-start; }
.line-theme .post-header { display: none; }
.line-theme .post-author-line { display: block; font-size: 0.8em; color: var(--text-color); margin: 0 0 4px 2px; }
.line-theme .my-post .post-author-line { display: none; }
.line-theme .post-bubble { display: flex; flex-direction: row; align-items: flex-end; }
.line-theme .post-body { padding: 10px 14px; border-radius: 18px; line-height: 1.5; box-shadow: 0 1px 2px rgba(0,0,0,0.1); }
.line-theme .other-post .post-body { background-color: var(--line-other-bubble-bg); border-top-left-radius: 4px; border: 1px solid #c0c0c0; }
.line-theme .my-post .post-body { background-color: var(--line-my-bubble-bg); border-top-right-radius: 4px; border: 1px solid #78c430; }
.line-theme .post-date-classic { display: none; }
.line-theme .post-date-line { display: block; font-size: 0.75em; color: var(--text-color-secondary); white-space: nowrap; margin: 0 6px; padding-bottom: 2px; }
.line-theme .post-form-wrapper { background-color: transparent; border-top: 1px solid rgba(0, 0, 0, 0.1); }
.line-theme h3, .line-theme hr { display: none; }
.line-theme #new-post-form { flex-direction: row; flex-wrap: wrap; align-items: flex-end; gap: 8px; }
.line-theme #new-post-form input { display: block; border-radius: 18px; padding: 8px 12px; flex-basis: 100%; margin-bottom: -4px; border: 1px solid #ccc; }
.line-theme #new-post-form textarea { flex-grow: 1; border-radius: 18px; padding: 8px 12px; border: 1px solid #ccc; }
.line-theme #new-post-form button {
    align-self: auto; flex-shrink: 0; width: 38px; height: 38px; padding: 0; border-radius: 50%;
    display: flex; align-items: center; justify-content: center; font-size: 0;
    background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/></svg>');
    background-repeat: no-repeat; background-position: center; background-size: 20px;
}
.line-theme #new-post-form button::before { content: ''; }


/* --- トースト通知のスタイル --- */
#toast-container {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    z-index: 1000; display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.toast {
    background-color: rgba(0, 0, 0, 0.7); color: white; padding: 12px 20px;
    border-radius: 25px; font-size: 0.9em; box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    opacity: 0; transition: opacity 0.5s, transform 0.5s; transform: translateY(20px);
}
.toast.show { opacity: 1; transform: translateY(0); }


/* --- 自由掲示板 --- */
#freeboard-list-view, #freeboard-create-view {
    overflow-y: auto; /* スクロール可能にする */
}
#freeboard-list-container { padding: 16px; }
#freeboard-create-view { padding: 24px 16px; align-items: center; }
.freeboard-thread-item {
    background-color: #fff; border: 1px solid var(--border-color); border-radius: var(--button-radius);
    padding: 12px 16px; margin-bottom: 12px; cursor: pointer;
    transition: background-color 0.2s, box-shadow 0.2s;
}
.freeboard-thread-item:hover { background-color: #f8f9fa; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
.thread-item-title { font-size: 1.1em; font-weight: 600; color: var(--text-color); margin-bottom: 8px; }
.thread-item-meta { font-size: 0.85em; color: var(--text-color-secondary); display: flex; gap: 16px; }
#freeboard-create-form {
    display: flex; flex-direction: column; gap: 12px; margin-top: 20px;
    max-width: 500px; width: 100%;
}
#freeboard-new-title {
    padding: 12px; border: 1px solid #ccc; border-radius: var(--button-radius);
    font-size: 1.1em; font-family: var(--font-modern);
}
#freeboard-create-form button[type="submit"] {
    padding: 12px 16px; background-color: var(--accent-color); color: white;
    border: none; border-radius: var(--button-radius); font-weight: 600;
    font-size: 1.1em; cursor: pointer; transition: background-color 0.2s;
}
#freeboard-create-form button[type="submit"]:hover { background-color: var(--link-hover-color); }
#freeboard-create-form button[type="submit"]:disabled { background-color: #a0a3a7; cursor: not-allowed; }