/* === 语文复习学习网站 - 核心样式 === */

/* --- 首页学习面板 --- */
.study-hero{max-width:960px;margin:0 auto;padding:40px 20px;text-align:center}
.study-hero h1{font-size:36px;color:#1a1a2e;margin-bottom:10px}
.study-hero p{font-size:18px;color:#666;margin-bottom:30px}
.study-search{max-width:500px;margin:0 auto 40px;position:relative}
.study-search input{width:100%;padding:14px 50px 14px 20px;border:2px solid #2589c5;border-radius:30px;font-size:16px;outline:none;box-sizing:border-box}
.study-search button{position:absolute;right:5px;top:5px;height:42px;width:42px;border:none;background:#2589c5;color:#fff;border-radius:50%;cursor:pointer;font-size:18px}
.study-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;max-width:960px;margin:0 auto;padding:0 20px}
.study-card{background:#fff;border-radius:12px;padding:30px 20px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,0.08);transition:transform 0.2s,box-shadow 0.2s;cursor:pointer;display:block;color:#333;text-decoration:none}
.study-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,0.15);color:#1a1a2e}
.study-card .card-icon{font-size:42px;margin-bottom:12px;display:block}
.study-card h3{font-size:20px;margin:0 0 6px;color:#1a1a2e}
.study-card p{font-size:14px;color:#888;margin:0}
.study-card.wenyan{border-top:4px solid #e74c3c}
.study-card.gushi{border-top:4px solid #8e44ad}
.study-card.zici{border-top:4px solid #27ae60}
.study-card.tongjia{border-top:4px solid #e67e22}
.study-card.xingjin{border-top:4px solid #2980b9}
.study-card.yicuoci{border-top:4px solid #c0392b}
.study-card.lianxi{border-top:4px solid #16a085}
.study-card.grade{border-top:4px solid #2c3e50}

/* --- 二级页面通用 --- */
.page-header{background:#f8f9fa;border-bottom:1px solid #e6e6e8;padding:15px 20px;display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:100}
.page-header a{color:#2589c5;text-decoration:none}
.page-header span{color:#999}
.page-container{max-width:1000px;margin:0 auto;padding:30px 20px}

/* --- 筛选标签栏 --- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}
.filter-tag{padding:6px 16px;border:1px solid #ddd;border-radius:20px;font-size:14px;cursor:pointer;background:#fff;color:#555;transition:all 0.2s}
.filter-tag:hover,.filter-tag.active{background:#2589c5;color:#fff;border-color:#2589c5}

/* --- 文本列表卡片 --- */
.text-list{}
.text-item{display:block;padding:18px 20px;border-bottom:1px solid #f0f0f0;text-decoration:none;color:#333;transition:background 0.15s;border-radius:8px;margin-bottom:4px}
.text-item:hover{background:#f8f9ff}
.text-item h3{font-size:18px;margin:0 0 4px;color:#1a1a2e}
.text-item .meta{font-size:13px;color:#999}
.text-item .meta span{margin-right:12px}
.text-item .tag{display:inline-block;padding:2px 8px;background:#e8f4fd;color:#2589c5;border-radius:10px;font-size:12px;margin-right:4px}
.text-item .tag.wenyan-tag{background:#fde8e8;color:#c0392b}
.text-item .tag.gushi-tag{background:#f3e8fd;color:#8e44ad}

/* --- 阅读页面增强 --- */
/* 侧边课本原图面板 */
.image-panel{position:fixed;right:0;top:60px;width:380px;height:calc(100vh - 60px);background:#f5f5f5;border-left:1px solid #e0e0e0;z-index:999;overflow-y:auto;transition:transform 0.3s ease;box-shadow:-2px 0 10px rgba(0,0,0,0.1)}
.image-panel.collapsed{transform:translateX(370px)}
.image-panel-toggle{position:fixed;right:380px;top:50%;transform:translateY(-50%);z-index:1000;background:#2589c5;color:#fff;border:none;padding:12px 6px;border-radius:8px 0 0 8px;cursor:pointer;font-size:14px;writing-mode:vertical-rl;transition:right 0.3s ease;box-shadow:-2px 0 8px rgba(0,0,0,0.15)}
.image-panel-toggle.collapsed{right:0}
.image-panel img{width:100%;height:auto;display:block;margin-bottom:10px}
.image-panel .panel-title{padding:15px;font-size:16px;font-weight:bold;color:#333;border-bottom:1px solid #e0e0e0;background:#fff;position:sticky;top:0;z-index:1}
.image-panel .panel-close{position:absolute;right:12px;top:12px;background:none;border:none;font-size:20px;cursor:pointer;color:#999}
@media(max-width:1300px){.image-panel{width:300px}.image-panel.collapsed{transform:translateX(290px)}.image-panel-toggle{right:300px}.image-panel-toggle.collapsed{right:0}}
@media(max-width:900px){.image-panel{width:100%;top:auto;bottom:0;height:50vh;transform:translateY(100%)}.image-panel.collapsed{transform:translateY(calc(100% - 40px))}.image-panel-toggle{right:0;top:auto;bottom:50vh;writing-mode:horizontal-tb;padding:6px 12px;border-radius:8px 8px 0 0}.image-panel-toggle.collapsed{bottom:calc(50vh - 40px)}}

/* 右侧留出图片面板空间 */
body.has-image-panel #main{margin-right:380px;max-width:800px}
@media(max-width:1300px){body.has-image-panel #main{margin-right:300px}}
@media(max-width:900px){body.has-image-panel #main{margin-right:0}}

/* --- 注释弹窗 --- */
.annotate-word{color:#c0392b;border-bottom:2px dotted #c0392b;cursor:pointer;position:relative;font-weight:bold}
.annotate-word:hover{background:#fff3cd}
.annotate-word.tongjia{color:#e67e22;border-bottom-color:#e67e22}
.annotate-word.yicuoci{color:#e74c3c;background:rgba(231,76,60,0.08);border-bottom:2px wavy #e74c3c}
.annotate-tooltip{display:none;position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);background:#333;color:#fff;padding:10px 14px;border-radius:8px;font-size:14px;white-space:nowrap;z-index:9999;max-width:300px;white-space:normal;line-height:1.5;box-shadow:0 4px 12px rgba(0,0,0,0.3)}
.annotate-tooltip::after{content:'';position:absolute;top:100%;left:50%;transform:translateX(-50%);border:6px solid transparent;border-top-color:#333}
.annotate-word:hover .annotate-tooltip{display:block}
.annotate-tooltip .pinyin{color:#80cdff;font-size:12px;display:block}
.annotate-tooltip .meaning{color:#fff;font-size:13px;display:block;margin-top:2px}

/* --- 原文/译文对照 --- */
.parallel-text{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:20px 0}
.parallel-text .orig,.parallel-text .trans{padding:15px;border-radius:8px;line-height:2}
.parallel-text .orig{background:#fdf6ec;border-left:4px solid #e67e22;font-family:'SimSun','宋体',serif;font-size:18px}
.parallel-text .trans{background:#f0f7ff;border-left:4px solid #2589c5;font-size:16px;color:#555}
@media(max-width:700px){.parallel-text{grid-template-columns:1fr}}

/* --- 逐句练习模式 --- */
.poem-exercise{margin:20px 0}
.poem-exercise .line-group{display:flex;align-items:center;margin:8px 0;padding:10px;background:#fafafa;border-radius:8px;flex-wrap:wrap;gap:8px}
.poem-exercise .hint{flex:0 0 200px;font-size:14px;color:#888;line-height:1.4}
.poem-exercise .hint strong{color:#555;display:block}
.poem-exercise input{flex:1;min-width:200px;padding:10px 14px;border:2px solid #e0e0e0;border-radius:8px;font-size:16px;font-family:'SimSun','宋体',serif;outline:none;transition:border-color 0.2s}
.poem-exercise input:focus{border-color:#2589c5}
.poem-exercise input.correct{border-color:#27ae60;background:#f0faf4}
.poem-exercise input.wrong{border-color:#e74c3c;background:#fef5f5}
.poem-exercise .answer{font-size:16px;color:#27ae60;font-family:'SimSun','宋体',serif;display:none}
.poem-exercise .show-answer{font-size:12px;color:#2589c5;cursor:pointer;white-space:nowrap}
.poem-exercise .check-btn{padding:10px 24px;background:#2589c5;color:#fff;border:none;border-radius:8px;font-size:15px;cursor:pointer;margin-top:15px}
.poem-exercise .check-btn:hover{background:#1a6fa0}
.line-number{display:inline-block;width:24px;height:24px;line-height:24px;text-align:center;background:#eee;border-radius:50%;font-size:12px;color:#999;margin-right:4px;flex-shrink:0}

/* --- 通假字/形近字表格 --- */
.data-table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px}
.data-table th{background:#f0f4f8;padding:14px 12px;text-align:left;font-weight:bold;color:#333;border-bottom:2px solid #ddd;position:sticky;top:0}
.data-table td{padding:12px;border-bottom:1px solid #eee;vertical-align:top}
.data-table tr:hover{background:#fafbfc}
.data-table .char-cell{font-size:22px;font-weight:bold;text-align:center;font-family:'KaiTi','楷体',serif}
.data-table .source{font-size:13px;color:#888}

/* --- 形近字对比卡片 --- */
.xingjin-group{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin:16px 0}
.xingjin-card{background:#fff;border:2px solid #e8e8e8;border-radius:12px;padding:20px;text-align:center;transition:all 0.2s}
.xingjin-card:hover{border-color:#2589c5;box-shadow:0 2px 8px rgba(37,137,197,0.15)}
.xingjin-card .big-char{font-size:48px;font-family:'KaiTi','楷体',serif;margin-bottom:8px;color:#1a1a2e}
.xingjin-card .pinyin{font-size:14px;color:#2589c5;margin-bottom:4px}
.xingjin-card .meaning{font-size:13px;color:#666}
.xingjin-card .example{font-size:13px;color:#999;margin-top:4px}

/* --- 易错字高亮 --- */
.error-char{border-bottom:3px wavy #e74c3c;background:rgba(231,76,60,0.06);padding:1px 3px;border-radius:2px;cursor:help}
.error-char::after{content:attr(data-note);position:absolute;opacity:0;pointer-events:none;transition:opacity 0.2s}
.error-char:hover{background:rgba(231,76,60,0.15)}

/* --- 闪卡模式 --- */
.flashcard-container{perspective:1000px;width:300px;height:200px;margin:30px auto;cursor:pointer}
.flashcard{position:relative;width:100%;height:100%;transition:transform 0.6s;transform-style:preserve-3d}
.flashcard.flipped{transform:rotateY(180deg)}
.flashcard .front,.flashcard .back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;box-sizing:border-box;box-shadow:0 4px 16px rgba(0,0,0,0.1)}
.flashcard .front{background:#fff;border:2px solid #e0e0e0}
.flashcard .back{background:#2589c5;color:#fff;transform:rotateY(180deg)}
.flashcard .front .char{font-size:48px;font-family:'KaiTi','楷体',serif;color:#1a1a2e}
.flashcard .front .source{font-size:13px;color:#999;margin-top:8px}
.flashcard .back .meaning{font-size:20px;text-align:center;line-height:1.6}
.flashcard .back .detail{font-size:14px;opacity:0.85;margin-top:10px;text-align:center}
.flashcard-nav{display:flex;justify-content:center;gap:12px;margin-top:20px}
.flashcard-nav button{padding:10px 20px;border:1px solid #ddd;background:#fff;border-radius:8px;cursor:pointer;font-size:14px;transition:all 0.2s}
.flashcard-nav button:hover{background:#2589c5;color:#fff;border-color:#2589c5}
.flashcard-counter{text-align:center;font-size:14px;color:#999;margin-top:10px}

/* --- 进度/统计 --- */
.stats-row{display:flex;gap:20px;flex-wrap:wrap;margin:20px 0}
.stat-box{flex:1;min-width:140px;background:#fff;border-radius:12px;padding:20px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.stat-box .num{font-size:36px;font-weight:bold;color:#2589c5}
.stat-box .label{font-size:14px;color:#999;margin-top:4px}

/* --- 响应式 --- */
@media(max-width:700px){
  .study-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .study-card{padding:20px 12px}
  .study-card .card-icon{font-size:32px}
  .xingjin-group{grid-template-columns:repeat(2,1fr)}
  .flashcard-container{width:260px;height:170px}
}

/* --- 夜间模式(基础) --- */
body.night-mode{background:#1a1a2e;color:#ccc}
body.night-mode .study-card,body.night-mode .stat-box,body.night-mode .data-table th,body.night-mode .text-item{background:#2a2a3e;color:#ccc}
body.night-mode .data-table td{border-color:#3a3a4e}
body.night-mode h1,body.night-mode h2,body.night-mode h3,body.night-mode .study-card h3{color:#eee}
body.night-mode .filter-tag{background:#333;color:#ccc;border-color:#444}
body.night-mode .page-header{background:#222;border-color:#333}