/* --- 字体定义 --- */
@font-face {
    font-family: 'SourceHanSerifJP';
    src: url('fonts/_SourceHanSerifJP-Regular.otf') format('opentype');
}
@font-face {
    font-family: 'SourceHanSerifCN';
    src: url('fonts/_SourceHanSerifCN-Regular.otf') format('opentype');
}

/* --- CSS 变量 (浅色主题) --- */
:root {
    --primary-text: #212529;
    --secondary-text: #6c757d;
    --bg-color: #f8f9fa;
    --panel-bg: #ffffff;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --correct-color: #28a745;
    --incorrect-color: #dc3545;
    --ambiguous-color: #6c757d;
    --ambiguous-bg: #e9ecef;
    --btn-hover-bg: #e9ecef;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* --- CSS 变量 (深色主题) --- */
[data-theme='dark'] {
    --primary-text: #e9ecef;
    --secondary-text: #adb5bd;
    --bg-color: #212529;
    --panel-bg: #343a40;
    --border-color: #495057;
    --accent-color: #0d6efd;
    --accent-hover: #0b5ed7;
    --correct-color: #198754;
    --incorrect-color: #dc3545;
    --ambiguous-color: #ced4da;
    --ambiguous-bg: #495057;
    --btn-hover-bg: #495057;
    --shadow: 0 4px 12px rgba(0,0,0,0.25);
}

/* --- 全局样式 & 动画 --- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
    height: 100%;
    font-family: 'SourceHanSerifCN', sans-serif;
    color: var(--primary-text);
    background-color: var(--bg-color);
    overflow: hidden;
    transition: color 0.15s, background-color 0.15s;
}
button {
    cursor: pointer;
    border: 1px solid var(--border-color);
    background-color: var(--panel-bg);
    color: var(--primary-text);
    padding: 10px 15px;
    border-radius: 8px;
    font-family: inherit;
    transition: background-color 0.15s, box-shadow 0.15s, border-color 0.15s;
}
button:hover { background-color: var(--btn-hover-bg); }
button:active { box-shadow: inset 0 1px 3px rgba(0,0,0,0.2); }
.view { display: none; }
.view.active { display: flex; flex-direction: column; }
.visually-hidden {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* --- 主菜单 --- */
#main-menu { justify-content: center; align-items: center; height: 100vh; gap: 20px; }
#main-menu h1 { font-size: 2.5rem; margin-bottom: 20px; }
.module-selection { display: flex; gap: 20px; }
#start-learning-btn, #start-dictation-btn {
    font-size: 1.2rem; padding: 15px 30px;
    background-color: var(--accent-color); color: white; border: none;
}
#start-learning-btn:hover, #start-dictation-btn:hover { background-color: var(--accent-hover); }
#word-list-display {
    display: flex; align-items: center; gap: 10px; margin-top: 30px;
    padding: 10px 20px; border: 1px solid var(--border-color);
    border-radius: 8px; max-width: 90%; background-color: var(--panel-bg);
}
#word-list-names {
    font-size: 0.9rem; color: var(--secondary-text);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.text-btn {
    border: none; background: none; color: var(--accent-color);
    padding: 5px; flex-shrink: 0; font-size: 0.9rem;
}

/* --- 通用模块布局 --- */
.app-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 20px; background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color); box-shadow: var(--shadow); z-index: 10;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.icon-btn { font-size: 1.5rem; border: none; background: transparent; }
.content-area {
    flex: 1; display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    padding: 20px; text-align: center; gap: 15px;
}
.navigation-controls {
    display: flex; justify-content: center; align-items: center;
    gap: 20px; padding: 20px;
}

/* --- 声调模块 --- */
#word-display-container {
    display: flex; justify-content: center; align-items: flex-end;
    font-family: 'SourceHanSerifJP', serif; line-height: 1;
}
.word-segment { display: inline-flex; flex-direction: column; align-items: center; margin: 0 0.05em; }
.kanji {
    font-size: 6rem; line-height: 1; font-weight: normal; color: var(--primary-text);
    transition: opacity 0.15s ease, font-weight 0.15s ease, visibility 0.15s ease;
}
.rt-container { display: flex; line-height: 1.2; margin-bottom: 0.2em; transition: opacity 0.15s ease, visibility 0.15s ease; }
.rt-mora {
    font-size: 2.2rem; font-weight: normal; color: var(--secondary-text);
    transition: opacity 0.15s ease, font-weight 0.15s ease;
}
#word-display-container.answered .kanji, #word-display-container.answered .rt-mora { opacity: 0.381; }
#word-display-container.answered .kanji.highlight-strong, #word-display-container.answered .rt-mora.highlight { opacity: 1; font-weight: normal; }
#word-display-container.answered .kanji.highlight-soft { opacity: 1; }

/* 声调模块可见性设置 */
body[data-kana-visibility="always-hide"] .rt-container,
body[data-jp-visibility="always-hide"] .kanji { display: none; }
body[data-kana-visibility="hide-on-answer"] #word-display-container:not(.answered) .rt-container,
body[data-jp-visibility="hide-on-answer"] #word-display-container:not(.answered) .kanji { opacity: 0; visibility: hidden; }

.audio-controls { display: flex; align-items: center; gap: 10px; }
#play-audio-btn { font-size: 2rem; border: none; background: transparent; }
#word-info-container { font-size: 1rem; color: var(--secondary-text); }
.keyboard-hint { font-size: 0.8rem; color: #aaa; align-self: center; }
body[data-interaction-hint="partial"] .hint-nav, body[data-interaction-hint="hide"] .keyboard-hint { display: none; }
.explanation-text {
    min-height: 40px; visibility: hidden; max-width: 600px;
    color: var(--ambiguous-color); padding: 10px; border-radius: 5px;
    background-color: var(--ambiguous-bg); transition: all 0.15s;
}
.explanation-text.visible { visibility: visible; }
#pitch-options-container { display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; margin-top: 20px; }
.pitch-option-btn { min-width: 60px; font-size: 1.2rem; display: flex; flex-direction: column; align-items: center; }
.pitch-option-btn .keyboard-hint { margin-top: 5px; }
.pitch-option-btn.correct { background-color: var(--correct-color); color: white; border-color: var(--correct-color); }
.pitch-option-btn.incorrect { background-color: var(--incorrect-color); color: white; border-color: var(--incorrect-color); }
.pitch-option-btn.ambiguous { background-color: var(--ambiguous-color); color: white; border-color: var(--ambiguous-color); }
.pitch-option-btn:disabled { opacity: 0.7; cursor: not-allowed; }

/* --- 听写模块 --- */
.audio-controls-dictation { margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
#dictation-play-audio-btn {
    font-size: 1.5rem; padding: 15px 25px; border-radius: 12px;
    display: inline-flex; align-items: center; gap: 10px;
}
#dictation-meaning-container {
    margin-bottom: 0; /* Override default gap */
    background-color: transparent;
    border: 1px solid transparent;
    font-size: 1.1rem;
    color: var(--secondary-text);
}
#dictation-input {
    width: 80%; max-width: 600px; padding: 15px; font-size: 2rem;
    text-align: center; border: 2px solid var(--border-color); border-radius: 8px;
    background-color: var(--panel-bg); color: var(--primary-text);
    transition: background-color 0.2s, border-color 0.2s;
}
#dictation-input:focus { outline: none; border-color: var(--accent-color); }
#dictation-input.correct {
    border-color: var(--correct-color);
}
#dictation-input.correct:disabled {
     background-color: #28a74520; color: var(--correct-color);
}
#dictation-input.incorrect {
    border-color: var(--incorrect-color);
}
#dictation-input.incorrect:disabled {
    background-color: #dc354520; color: var(--incorrect-color);
}

.dictation-controls {
    margin-top: 0; /* Override default gap */
}
#show-answer-btn-dictation {
    background: transparent;
    border: none;
    color: var(--secondary-text);
    font-size: 0.9rem;
    padding: 5px 10px;
}
#show-answer-btn-dictation:hover {
    color: var(--accent-color);
    background-color: transparent;
}
#dictation-answer-container {
    margin-top: 0;
    padding: 15px; font-size: 1.2rem; min-height: 0;
    background-color: transparent; border: 1px solid var(--border-color); border-radius: 8px;
}
#dictation-answer-container:not(.visible) { display: none; }
#dictation-correct-answer { font-weight: bold; margin-left: 8px; font-family: 'SourceHanSerifJP', serif; }

/* --- 通用面板 --- */
.slide-panel {
    position: fixed; bottom: 0; left: 0; height: 100%; width: 100%;
    background-color: var(--panel-bg); transform: translateY(100%);
    transition: transform 0.2s ease-in-out; z-index: 1000;
    display: flex; flex-direction: column;
}
.slide-panel.active { transform: translateY(0); }
.panel-header { display: flex; justify-content: space-between; align-items: center; padding: 15px; border-bottom: 1px solid var(--border-color); flex-shrink: 0; }
.panel-content { flex-grow: 1; overflow-y: auto; }
#word-list, #word-list-choices { list-style: none; padding: 10px; }
#word-list li { padding: 12px 15px; border-radius: 5px; cursor: pointer; font-size: 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border-bottom: 1px solid var(--border-color); }
#word-list li:last-child { border-bottom: none; }
#word-list li:hover { background-color: var(--btn-hover-bg); }
#word-list li.active { background-color: var(--accent-color); color: white; }
.word-list-item {
    display: flex; align-items: center; gap: 15px; padding: 15px;
    font-size: 1.1rem; cursor: pointer; border-bottom: 1px solid var(--border-color);
}
.word-list-item:last-child { border-bottom: none; }
.word-list-item input[type="checkbox"] { width: 1.5rem; height: 1.5rem; flex-shrink: 0; }
.settings-content { padding: 20px; display: flex; flex-direction: column; gap: 25px; }
.setting-item { display: flex; flex-direction: column; gap: 8px; }
.setting-item.checkbox-item { flex-direction: row; align-items: center; gap: 12px; }
.setting-item label { font-size: 1.1rem; }
.setting-item input[type="checkbox"] { width: 1.2rem; height: 1.2rem; }
.setting-item select, .setting-item input[type="number"] { width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 4px; background-color: var(--bg-color); color: var(--primary-text); font-size: 1rem; }
.jump-control { display: flex; gap: 10px; }
.jump-control input { flex: 1; }

.setting-pitch-only, .setting-dictation-only { display: none; }
#settings-modal[data-module="pitch"] .setting-pitch-only { display: flex; flex-direction: column; }
#settings-modal[data-module="pitch"] .setting-pitch-only.checkbox-item { flex-direction: row; }
#settings-modal[data-module="dictation"] .setting-dictation-only { display: flex; flex-direction: column; }


#overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); z-index: 999;
    opacity: 0; visibility: hidden; transition: opacity 0.2s, visibility 0.2s;
}
#overlay.active { opacity: 1; visibility: visible; }

/* --- 响应式设计 --- */
@media (max-width: 768px) {
    .kanji { font-size: 4rem; }
    .rt-mora { font-size: 1.5rem; }
    #dictation-input { font-size: 1.5rem; }
    #pitch-options-container { gap: 10px; }
    .pitch-option-btn { min-width: 50px; font-size: 1rem; }
}