/* ==========================================
   テーマ・配色変数定義
   ========================================== */
.theme-dark {
    --bg-dark: #020617;
    --card-bg: #0f172a;
    --text-main: #f1f5f9;
    --text-dim: #94a3b8;
    --border: #1e293b;
    --input-bg: #161e2e;
    --btn-download: #1e293b;
    --btn-download-text: #ffffff;
    --chapter-bg: #1e293b;
    --chapter-hover: #243249;
    --time-bg: #020617;
    --color-day1: #ffa05c;
    --color-day2: #a2c9ac;
    --color-day3: #78c6fc;
}

.theme-light {
    --bg-dark: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-dim: #64748b;
    --border: #e2e8f0;
    --input-bg: #f1f5f9;
    --btn-download: #e2e8f0;
    --btn-download-text: #0f172a;
    --chapter-bg: #f1f5f9;
    --chapter-hover: #e2e8f0;
    --time-bg: #cbd5e1;
    --color-day1: #d65a00;
    --color-day2: #345c3f;
    --color-day3: #0a5883;
}

:root {
    --primary: #fff; /* アクセントカラー */
}

/* ==========================================
   全体共通設定
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

.hidden { 
    display: none !important; 
}

.text-color-day1 { color: var(--color-day1); }
.text-color-day2 { color: var(--color-day2); }
.text-color-day3 { color: var(--color-day3); }

/* ==========================================
   テーマ切り替えボタン
   ========================================== */
.theme-toggle-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    color: #636363;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.theme-toggle-btn:hover {
    border-color: var(--primary);
}

/* ==========================================
   ログイン画面
   ========================================== */
.auth-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    padding: 20px;
}

.login-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border);
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s, border-color 0.3s;
}

.brand-logo { 
    font-weight: 700; 
    letter-spacing: 2px; 
    color: var(--primary); 
    margin-bottom: 30px;
    font-size: 18px;
    text-align: center;
}

.input-group {
    text-align: left;
    margin-bottom: 20px;
}

.input-group label { 
    display: block; 
    font-size: 12px; 
    letter-spacing: 1px; 
    color: var(--text-dim); 
    margin-bottom: 8px; 
    font-weight: 600;
}

.input-group input {
    width: 100%; 
    padding: 14px; 
    background: var(--input-bg); 
    border: 1px solid var(--border);
    color: var(--text-main); 
    border-radius: 6px; 
    font-size: 16px;
    transition: border-color 0.2s, background-color 0.3s, color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.captcha-group {
    display: flex;
    justify-content: center;
    margin-bottom: 25px;
}

#login-btn {
    width: 100%; 
    padding: 16px; 
    color: #020617;
    border: none; 
    border-radius: 6px; 
    font-weight: 700; 
    font-size: 15px;
    cursor: pointer; 
    transition: opacity 0.2s;
}

#login-btn:disabled { 
    opacity: 0.3; 
    cursor: not-allowed; 
}

.error-msg {
    color: #f87171;
    font-size: 14px;
    margin-top: 15px;
    text-align: center;
    min-height: 20px;
}

/* ==========================================
   メイン画面・プレイヤーコンテナ設定
   ========================================== */
.container { 
    max-width: 1000px; 
    margin: 0 auto; 
    padding: 0 20px; 
}

.main-header { 
    padding: 30px 0 0 0; 
    border-bottom: 1px solid var(--border); 
    background: var(--bg-dark); 
    position: sticky; 
    top: 0; 
    z-index: 100; 
    transition: background-color 0.3s, border-color 0.3s;
}

.main-header h1 { font-size: 22px; font-weight: 700; color: var(--text-main); }
.main-date { font-size: 15px; margin-bottom: 25px; color: var(--text-dim); }

.tabs { display: flex; gap: 35px; }

.tab-btn {
    background: none; 
    border: none; 
    color: var(--text-dim); 
    font-size: 16px; 
    font-weight: 600; 
    cursor: pointer; 
    padding-bottom: 15px; 
    border-bottom: 2px solid transparent; 
    transition: color 0.2s, border-color 0.2s;
}

.tab-btn:hover { color: var(--text-main); }
.select-day1.active { color: var(--color-day1); border-color: var(--color-day1); }
.select-day2.active { color: var(--color-day2); border-color: var(--color-day2); }
.select-day3.active { color: var(--color-day3); border-color: var(--color-day3); }
.select.active { color: var(--text-main); border-color: var(--text-main); }

.tab-pane { display: none; padding: 40px 0 60px 0; }
.tab-pane.active { display: block; }

.video-card { display: flex; flex-direction: column; gap: 25px; }

/* 【修正】通常動画表示時の16:9比率完全固定化（ガクつき防止） */
.video-container { 
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #000;
    border-radius: 8px;
    overflow: hidden; 
    transition: aspect-ratio 0.2s ease, height 0.2s ease;
}

.video-container .plyr {
    height: 100% !important;
    width: 100% !important;
}

.video-info h2 { font-size: 24px; font-weight: 700; }

/* アクションボタンバー */
.action-bar {
    display: flex;          
    gap: 12px;              
    width: 100%;            
    margin-bottom: 30px;
}

.download-btn,
.audio-mode-btn {
    justify-content: center; 
    display: inline-flex; 
    align-items: center; 
    gap: 8px; 
    padding: 12px 20px;
    background: var(--btn-download); 
    color: var(--btn-download-text); 
    border: 1px solid var(--border);
    border-radius: 6px; 
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    box-sizing: border-box; 
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.download-btn:hover,
.audio-mode-btn:hover { 
    background: var(--primary); 
    color: #020617; 
    border-color: var(--text-dim);
}

.audio-mode-btn.active {
    background: #10b981 !important; 
    color: #ffffff !important;
    border-color: #10b981;
}

.theme-script { padding: 10px 0 2em; }
.explanation { font-size: 12px; margin-bottom: 2em; }

/* チャプターセクション */
.chapter-module h3 { font-size: 14px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); margin-bottom: 15px; }
.chapter-grid { display: flex; flex-direction: column; gap: 0px; }

.chapter-btn {
    display: flex; 
    align-items: center; 
    background: var(--bg-dark); 
    border: none;
    padding: 10px 0; 
    border-radius: 6px; 
    cursor: pointer; 
    text-align: left; 
    transition: border-color 0.2s, background-color 0.2s, transform 0.1s;
    width: 100%;
}

.chapter-btn:hover { border-color: var(--primary); background-color: var(--chapter-hover); }
.chapter-btn:active { transform: scale(0.995); }

.chapter-btn .time { 
    font-family: monospace; 
    color: var(--text-main); 
    padding: 4px 0; 
    border-radius: 4px; 
    font-weight: 700; 
    font-size: 13px;
    width: 60px;          
    flex-shrink: 0;       
}

.chapter-btn .title { 
    color: var(--text-main); 
    font-weight: 500; 
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chapter-btn:not(:has(.time)) .title { margin-left: 75px; }

.auth-screen.hidden, #login-container.hidden, .hidden { display: none !important; }
.main-content, #main-container { display: block !important; }


/* ==========================================
   【大幅修正】音声モード時の完全スリム化・不要UI除外
   ========================================== */

/* ==========================================
   【最適化】本物の音声モード（src差し替え）連動スタイル
   ========================================== */

/* 1. 音声モードON：16:9の比率を解除し、コントロールバーの高さ（48px）へ綺麗に固定 */
.video-container.audio-only-active {
    aspect-ratio: auto !important;
    height: 48px !important;
    background: #0f172a !important; /* バーの背景色をダークブルーに */
}

/* 2. 音声モードON：中央の巨大な青い再生ボタンを完全消去 */
.video-container.audio-only-active .plyr__control--overlaid {
    display: none !important;
}

/* 3. 音声モードON：ポスター画像や映像表示エリアの「高さ」をゼロにする
   ※display:noneにするとPlyrがプレイヤー自体が非表示になったと誤認するため、高さを奪うのが正解です */
.video-container.audio-only-active .plyr__video-wrapper,
.video-container.audio-only-active .plyr__poster {
    height: 0 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

/* 4. 音声モードON：コントロールバーを動画の下部に沈ませず、定位置（最前面）に固定 */
.video-container.audio-only-active .plyr--video .plyr__controls {
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    position: relative !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: #0f172a !important;
    padding: 10px 15px !important;
}

/* 音声モードON時の全体ラッパー制御 */
.video-container.audio-only-active .plyr {
    padding-top: 0 !important;
    height: 100% !important;
    background: #0f172a !important;
}