/* ========== 共通スタイル ========== */

/* --- 基本設定 --- */
body {
  font-family: "メイリオ", Meiryo, "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", Osaka, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
  font-size: 16px;
  background: #f4f6f9;
  margin: 0;
  padding: 0;
  line-height: 1.7;
}
.header {
  background-color: #333;
  padding: 10px 0;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
}
body.with-header > .container {
  padding-top: 75px;
}

.container {
  max-width: 1000px;
  margin: auto;
  padding: 20px;
}

h1, h2, h3, h4 {
  color: #333;
  text-align: center;
}
h1 { font-size: 1.8em; }
h2 { font-size: 1.5em; }
h3 { font-size: 1.2em; }
p { color: #555; }

/* --- ヘッダーナビゲーション --- */
.header-nav {
  max-width: 1000px;
  margin: auto;
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.header-nav a {
  color: white;
  text-decoration: none;
  padding: 10px 15px;
  border-radius: 5px;
  transition: background-color 0.3s;
  font-size: 1em;
}
.header-nav a:hover { background-color: #555; }
.header-nav a.active { background-color: #4a90e2; }

/* --- カード --- */
.card {
  background: white;
  padding: 20px;
  margin: 15px 0;
  border-radius: 12px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  position: relative;
}

/* --- ボタン --- */
button {
  background: #4a90e2;
  color: white;
  padding: 10px 20px;
  margin: 10px 5px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.3s;
  font-size: 1em;
}
button:hover { background: #357ABD; }
button:disabled { background-color: #ccc; cursor: not-allowed; opacity: 0.6; }

/* ========== index.html（トップページ）用 ========== */
.icon-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 140px;
  height: 120px;
  margin: 10px;
  border: none;
  background: #E6F3FF;
  border-radius: 12px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  cursor: pointer;
  transition: 0.3s;
  color: black;
  text-decoration: none;
  white-space: nowrap;
}
.icon-button:hover { background: #4a90e2; color: white; transform: translateY(-5px); }
.icon-button i { font-size: 48px; margin-bottom: 10px; }
.icon-container { display: flex; flex-wrap: wrap; justify-content: center; }
.category-menu { display: flex; flex-direction: column; gap: 20px; }
.category-card { background: #f8f9fa; padding: 15px; border-radius: 8px; border-left: 4px solid #4a90e2; }
.category-title { font-size: 1.1em; font-weight: bold; margin-bottom: 10px; color: #333; }
.mode-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
.mode-button { flex: 1; min-width: 120px; padding: 8px 16px; background: #e9ecef; color: #495057; border: 1px solid #ced4da; border-radius: 6px; cursor: pointer; transition: all 0.3s; display: flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; }
.mode-button:hover { background: #4a90e2; color: white; border-color: #4a90e2; }

/* ========== toeic-overview.html / other-exams.html用 ========== */
.overview-title { border-bottom: 2px solid #4a90e2; padding-bottom: 10px; }
.section-title { border-left: 5px solid #4a90e2; padding-left: 10px; margin-top: 40px; text-align: left; }
.icon { margin-right: 8px; }
/* コラムページへのパート別リンク用 */
.part-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}


/* ========== column.html用 ========== */
.tabs { display: flex; justify-content: center; border-bottom: 2px solid #ddd; margin-bottom: 20px; }
.tab-link { background-color: #f1f1f1; border: none; outline: none; cursor: pointer; padding: 14px 20px; transition: background-color 0.3s, color 0.3s; font-size: 1em; font-weight: 600; border-radius: 8px 8px 0 0; margin-right: 5px; color: #333; }
.tab-link:hover { background-color: #e0e0e0; }
.tab-link.active { background-color: #4a90e2; color: white; }
.tab-content-item { display: none; animation: fadeIn 0.5s; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.article-card { background: white; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); overflow: hidden; text-decoration: none; color: inherit; display: flex; flex-direction: column; transition: transform 0.3s, box-shadow 0.3s; }
.article-card:hover { transform: translateY(-5px); box-shadow: 0 4px 15px rgba(0,0,0,0.15); }
.article-card img { width: 100%; height: 150px; object-fit: cover; }
.article-card-content { padding: 15px; flex-grow: 1; }
.article-card-content h3 { margin-top: 0; font-size: 1.1em; }
.article-card-content p { font-size: 1em; color: #555; line-height: 1.6; overflow: hidden; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 6; mask-image: linear-gradient(to bottom, black 85%, transparent 100%); -webkit-mask-image: linear-gradient(to bottom, black 85%, transparent 100%); }

/* サブタブ用のスタイル */
.sub-tabs {
  padding: 10px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}
.sub-tab-link {
  background-color: #e9ecef;
  color: #495057;
  border: 1px solid #ced4da;
  border-radius: 20px;
  padding: 8px 16px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 0.9em;
  margin: 0;
  font-family: inherit;
}
.sub-tab-link:hover {
  background-color: #d1d9e6;
}
.sub-tab-link.active {
  background-color: #4a90e2;
  color: white;
  border-color: #4a90e2;
}

@media (max-width: 768px) { .article-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .article-grid { grid-template-columns: 1fr; } }

/* ========== クイズ・ブックマーク・統計ページ共通 ========== */
.hidden { display: none; }
.choices { margin: 20px 0; display: flex; flex-direction: column; gap: 10px; }
.bookmark { position: absolute; top: 20px; right: 20px; cursor: pointer; font-size: 24px; color: #ccc; z-index: 10; }
.bookmarked { color: gold; }
.result { background: #f8f9fa; padding: 20px; border-radius: 10px; margin-top: 20px; }
.result-item { padding: 15px; margin: 10px 0; border-radius: 8px; text-align: left; border-left: 5px solid; position: relative; }
.result-item .bookmark { top: 15px; right: 15px; }
.result-item.correct { background-color: #d4edda; border-color: #28a745; }
.result-item.incorrect { background-color: #f8d7da; border-color: #dc3545; }
.quit-quiz-btn { position: absolute; top: 20px; left: 20px; background: #6c757d; color: white; padding: 8px 15px; margin: 0; border-radius: 8px; text-decoration: none; font-size: 14px; z-index: 10; }
.quit-quiz-btn:hover { background: #5a6268; color: white; }
.feedback { margin-top: 10px; padding: 15px; border-radius: 8px; border-left: 5px solid; }
.feedback.correct { background-color: #d4edda; border-color: #c3e6cb; }
.feedback.incorrect { background-color: #f8d7da; border-color: #f5c6cb; }
.tab-container { margin-bottom: 20px; }
.tab-buttons { display: flex; border-bottom: 1px solid #dee2e6; margin-bottom: 20px; }
.tab-button { flex: 1; padding: 12px; border: none; background: #e9ecef; color: #495057; cursor: pointer; border-bottom: 3px solid transparent; transition: all 0.3s; }
.tab-button.active { background: #4a90e2; color: white; border-bottom-color: #357ABD; font-weight: bold; }
.level-button { margin: 5px; padding: 5px 10px; background-color: #4a90e2; color: white; border: none; border-radius: 5px; cursor: pointer; }
.level-button.active { background-color: #3536bd; font-weight: bold; }
.popup { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #333; color: white; padding: 10px 20px; border-radius: 5px; z-index: 1001; opacity: 0; transition: opacity 0.3s; }
.popup.show { opacity: 1; }

/* --- リスニングページ専用 --- */
.question-header { text-align: center; margin-bottom: 10px; position: relative; padding-top: 10px; }
#speak-btn { font-size: 48px; cursor: pointer; color: #4a90e2; background: none; border: none; padding: 0 20px; }
#speak-btn:hover { color: #357ABD; }
.speak-note { font-size: 0.8em; color: #6c757d; margin: 0; }
.q-section { margin-top: 25px; }
.q-label { font-weight: bold; color: #555; margin-bottom: 8px; font-size: 0.9em; }
#question { font-weight: bold; font-size: 1.2em; margin-top: 5px; }
#sentence-container { background-color: #f8f9fa; border: 1px solid #e9ecef; padding: 15px; border-radius: 8px; margin-top: 10px; }
#toggle-sentence-btn { background-color: #6c757d; font-size: 14px; padding: 8px 15px; margin: 0; }
.speech-controls-container { position: absolute; top: 0; left: 0; display: flex; flex-direction: column; gap: 5px; z-index: 5; }
.rate-controls, .voice-controls { display: flex; gap: 5px; }
.rate-controls button { background: #e9ecef; color: #495057; border-radius: 20px; padding: 0; margin: 0; width: 40px; height: 25px; font-size: 12px; border: 1px solid #dee2e6; }
.rate-controls button.selected { background: #007bff; color: white; border-color: #007bff; }
.voice-controls button { width: 35px; height: 35px; border-radius: 50%; font-size: 16px; padding: 0; margin: 0; display: flex; justify-content: center; align-items: center; background: #e9ecef; color: #495057; border: 1px solid #dee2e6; }
#voice-female.selected { background-color: #E91E63; color: white; border-color: #E91E63; }
#voice-male.selected { background-color: #2196F3; color: white; border-color: #2196F3; }

/* --- result.html / bookmark.html 専用 --- */
.card-icon-button { position: absolute; top: 20px; color: white; width: 40px; height: 40px; padding: 0; margin: 0; border-radius: 50%; font-size: 16px; display: flex; align-items: center; justify-content: center; border: none; text-decoration: none; cursor: pointer; transition: background-color 0.3s; }
#back-to-top-btn { left: 20px; background: #6c757d; width: auto; height: auto; padding: 8px 15px; border-radius: 8px; font-size: 14px; text-decoration: none; }
#back-to-top-btn:hover { background: #5a6268; }
#delete-history-btn { right: 20px; background: #dc3545; }
#delete-history-btn:hover { background: #c82333; }
.mistake-card { background-color: #f8f9fa; border: 1px solid #dee2e6; border-radius: 0.25rem; padding: 1rem; margin-bottom: 1rem; text-align: left;}
.mistake-item { position: relative; padding-right: 30px; border-bottom: 1px solid #ddd; padding-bottom: 10px; margin-bottom: 10px; }
.mistake-item:last-child { border-bottom: none; }
.bookmark-icon { position: absolute; top: 5px; right: 5px; cursor: pointer; font-size: 24px; color: #ccc; }
.bookmark-icon.bookmarked { color: #ffd700; }
.bookmarked-question { position: relative; padding: 20px; margin-bottom: 20px; border: 1px solid #ddd; border-radius: 8px; }
.delete-bookmark { position: absolute; top: 10px; right: 10px; cursor: pointer; font-size: 20px; color: #ff4d4d; }
.confirmation-dialog { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; padding: 20px; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); z-index: 1000; }
.confirmation-dialog button { margin: 0 10px; }

/* --- レベル選択画面のボタン配置調整 --- */
.level-buttons-group {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 20px; /* ボタンと「トップに戻る」ボタンの間に余白を追加 */
}
.back-to-level-select { /* 新しいスタイル */
    background-color: #6c757d;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    font-size: 1em;
    display: block; /* ボタンのサイズを内容に合わせる */
    width: fit-content; /* ボタンのサイズを内容に合わせる */
    margin: 0 0 0 20px; /* 左寄せにし、左側の余白を20pxに設定（カードのpaddingに合わせる） */
    text-decoration: none; /* 下線を削除 */
}
.back-to-level-select:hover {
    background: #5a6268;
}

/* ========== toeic-overview.html 用の追加スタイル ========== */

/* --- ページ上部のメインビジュアル --- */
.hero-header {
    text-align: center;
    padding: 25px 20px;
    background: linear-gradient(135deg, #4a90e2, #357ABD);
    border-radius: 12px;
    color: white;
    margin-bottom: 30px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}

/* h1とpは既存のスタイルがあるので、色のみ上書き */
.hero-header h1, .hero-header p {
    color: white;
}

.hero-header h1 {
    font-size: 1.8em;
    margin: 0;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
}

.hero-header p {
    font-size: 1em;
    opacity: 0.9;
    margin-top: 10px;
}

/* --- 「TOEICとは？」カード内の特徴グリッド --- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
    text-align: center;
}

.feature-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.feature-item i {
    font-size: 2.5em;
    color: #4a90e2; /* テーマカラー */
    margin-bottom: 15px;
}

.feature-item h3 {
    font-size: 1.1em;
    margin-bottom: 10px;
}

/* --- テスト構成セクション --- */
.test-format-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.test-section-card {
    padding: 25px;
    text-align: center;
    border-top: 5px solid;
    transition: transform 0.3s, box-shadow 0.3s;
}

.test-section-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.test-section-card h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.3em;
    margin-top: 0;
}

.listening-card { border-color: #5cb85c; } /* 緑 */
.reading-card { border-color: #f0ad4e; }  /* オレンジ */


/* --- 各パート詳細セクション --- */
.part-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

/* cardクラスのスタイルを継承しつつ、一部変更 */
.part-card {
    display: flex;
    flex-direction: column;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    transition: border-color 0.3s, box-shadow 0.3s;
    height: 100%;
    box-sizing: border-box;
}

.part-card:hover {
    border-color: #4a90e2;
}

.part-card h4 {
    font-size: 1.2em;
    color: #4a90e2;
    margin-top: 0;
    text-align: center;
}

.part-card p {
    flex-grow: 1; /* p要素がカードの高さを埋めるように */
    text-align: left;
    margin-bottom: 15px;
}

.part-focus-tag {
    display: inline-block;
    background-color: #e6f3ff;
    color: #357ABD;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: bold;
    align-self: flex-start; /* 左寄せ */
}

/* --- レスポンシブ対応 --- */
@media (max-width: 768px) {
    .hero-header h1 {
        font-size: 1.8em;
    }
    .test-format-container {
        grid-template-columns: 1fr;
    }
}

/* ========== toeic-overview.html パート別解説カード用 ========== */

.part-card.listening {
    border-top: 5px solid #5cb85c; /* 緑 */
    padding-top: 15px; /* 上ボーダーとのバランス調整 */
}

.part-card.reading {
    border-top: 5px solid #f0ad4e; /* オレンジ */
    padding-top: 15px; /* 上ボーダーとのバランス調整 */
}

/* ========== 説明アコーディオン用スタイル ========== */
.description-accordion {
    margin-top: 25px;
}

.description-accordion details {
    border: 1px solid #d1d9e6;
    border-radius: 10px;
    background: #f8f9fa;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.description-accordion details[open] {
    background: white;
}

.description-accordion summary {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1.1em;
    list-style: none;
    color: #333;
    position: relative;
    z-index: 1;
    transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}

.description-accordion summary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

.description-accordion summary > i:first-of-type,
.description-accordion summary > span {
    pointer-events: auto;
    cursor: pointer;
    z-index: 2;
}

.description-accordion summary > i:first-of-type {
    margin-right: 10px;
}


.description-accordion summary::-webkit-details-marker {
    display: none;
}

.description-accordion .accordion-icon {
    margin-left: auto;
    transition: transform 0.3s ease;
    color: #4a90e2;
    pointer-events: auto;
    cursor: pointer;
    z-index: 2;
}

.description-accordion details[open] .accordion-icon {
    transform: rotate(180deg);
}

.description-content {
    padding: 0px 25px 20px 25px;
    text-align: left;
    border-top: 1px solid #d1d9e6;
    background-color: white;
    border-radius: 0 0 10px 10px;
}

.description-content dl {
    padding: 0;
    margin: 0;
}

.description-content dt {
    font-weight: bold;
    margin-top: 1.2em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.description-content dt:first-child {
    margin-top: 1em;
}

.description-content dd {
    margin-left: 0;
    padding-top: 0.5em;
    padding-left: 27px;
    color: #555;
}