/* 全国计算机一级刷题 - 样式 */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
body{font-family:'Microsoft YaHei','PingFang SC',sans-serif;background:linear-gradient(135deg,#0c0c1d 0%,#1a1a3e 50%,#0d2137 100%);min-height:100vh;color:#2d3436}
.page{max-width:600px;margin:0 auto;padding:15px 15px 30px}

/* 顶部 */
.top-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px;gap:10px}
.btn-back{width:40px;height:40px;border-radius:50%;border:none;background:rgba(255,255,255,0.15);color:#4ecdc4;font-size:1.3em;cursor:pointer;display:flex;align-items:center;justify-content:center}
.page-title{font-size:1.2em;color:#eaeaea;font-weight:bold}
.xp-badge{background:rgba(78,205,196,0.2);color:#4ecdc4;padding:5px 12px;border-radius:20px;font-size:0.85em;font-weight:bold}

/* 卡片 */
.card{background:#fff;border-radius:20px;padding:20px;margin-bottom:15px;box-shadow:0 8px 30px rgba(0,0,0,0.3)}

/* 按钮 */
.btn{padding:14px 28px;font-size:1em;font-family:inherit;border:none;border-radius:50px;cursor:pointer;font-weight:bold;color:#fff;transition:all 0.2s;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn:active{transform:scale(0.95)}
.btn-primary{background:linear-gradient(135deg,#4ecdc4,#44a08d)}
.btn-success{background:linear-gradient(135deg,#00b894,#00cec9)}
.btn-warning{background:linear-gradient(135deg,#feca57,#f0932b);color:#2d3436}
.btn-outline{background:transparent;border:2px solid #4ecdc4;color:#4ecdc4}
.btn-sm{padding:10px 18px;font-size:0.85em}
.btn-block{width:100%}

/* 主页 */
.hero{text-align:center;padding:25px 0;color:#eaeaea}
.hero h1{font-size:clamp(1.5em,5vw,2em);margin-bottom:8px}
.hero p{font-size:0.9em;opacity:0.8}
.stats-row{display:flex;gap:10px;margin-bottom:15px}
.stat-item{flex:1;background:rgba(255,255,255,0.1);border-radius:14px;padding:12px 8px;text-align:center;backdrop-filter:blur(10px)}
.stat-val{font-size:1.4em;font-weight:bold;color:#4ecdc4}
.stat-label{font-size:0.75em;color:rgba(255,255,255,0.6);margin-top:4px}

/* 导航卡片 */
.nav-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:15px}
.nav-card{background:rgba(255,255,255,0.08);border-radius:16px;padding:18px 12px;text-align:center;text-decoration:none;color:#eaeaea;transition:all 0.2s;border:1px solid rgba(78,205,196,0.15)}
.nav-card:active{transform:scale(0.95);background:rgba(78,205,196,0.15)}
.nav-icon{font-size:2em;margin-bottom:8px}
.nav-title{font-size:0.95em;font-weight:bold}
.nav-desc{font-size:0.75em;opacity:0.7;margin-top:4px}

/* 单元列表 */
.unit-list{display:flex;flex-direction:column;gap:10px}
.level-tag{font-size:0.75em;padding:4px 12px;border-radius:12px;font-weight:bold;display:inline-block;margin-bottom:6px}
.level-1{background:#4ecdc422;color:#4ecdc4}
.level-2{background:#6c5ce722;color:#6c5ce7}
.level-3{background:#fd79a822;color:#fd79a8}
.unit-card{background:#fff;border-radius:16px;padding:14px;display:flex;align-items:center;gap:14px;cursor:pointer;transition:all 0.2s;box-shadow:0 4px 15px rgba(0,0,0,0.2)}
.unit-card:active{transform:scale(0.98)}
.unit-card.completed{border-left:4px solid #00b894}
.unit-card.locked{opacity:0.5;cursor:default;background:#f0f0f0}
.unit-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5em;flex-shrink:0}
.unit-info{flex:1;min-width:0}
.unit-info h3{font-size:0.95em;margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.unit-info p{font-size:0.8em;color:#636e72}
.unit-progress{flex-shrink:0;font-size:1em}
.lock-icon{font-size:1.2em;opacity:0.6}
.stars{font-size:1em}

/* 游戏界面 */
.game-header{display:flex;align-items:center;justify-content:space-between;padding:10px 0;gap:8px}
.game-stat{color:rgba(255,255,255,0.8);font-size:0.85em}
.game-stat .val{color:#4ecdc4;font-weight:bold}
.progress-bar{height:6px;background:rgba(255,255,255,0.1);border-radius:3px;margin-bottom:15px;overflow:hidden}
.progress-bar .fill{height:100%;background:linear-gradient(90deg,#4ecdc4,#44a08d);border-radius:3px;transition:width 0.3s}

/* 题目卡片 */
.question-card{background:#fff;border-radius:20px;padding:22px;margin-bottom:15px;box-shadow:0 8px 30px rgba(0,0,0,0.3)}
.question-num{font-size:0.85em;color:#636e72;margin-bottom:8px}
.question-text{font-size:1.05em;line-height:1.7;color:#2d3436;margin-bottom:20px;font-weight:500}

/* 选项 */
.options{display:flex;flex-direction:column;gap:10px}
.option-btn{width:100%;text-align:left;padding:14px 18px;border-radius:14px;border:2px solid #dfe6e9;background:#fff;font-size:0.95em;cursor:pointer;transition:all 0.2s;font-family:inherit;line-height:1.5;color:#2d3436}
.option-btn:active{transform:scale(0.98)}
.option-btn.selected{border-color:#4ecdc4;background:#4ecdc411;color:#2d3436}
.option-btn.correct{border-color:#00b894;background:#00b89411;color:#00b894}
.option-btn.wrong{border-color:#ff6b6b;background:#ff6b6b11;color:#ff6b6b}
.option-btn.show-correct{border-color:#00b894;background:#00b89411;color:#00b894}
.option-label{display:inline-block;width:24px;height:24px;border-radius:50%;background:#dfe6e9;color:#636e72;text-align:center;line-height:24px;font-size:0.85em;font-weight:bold;margin-right:10px;flex-shrink:0}
.option-btn.selected .option-label{background:#4ecdc4;color:#fff}
.option-btn.correct .option-label{background:#00b894;color:#fff}
.option-btn.wrong .option-label{background:#ff6b6b;color:#fff}

/* 解析 */
.explanation{background:#fff;border-radius:16px;padding:18px;box-shadow:0 4px 15px rgba(0,0,0,0.2)}
.explanation h4{margin-bottom:8px;font-size:1em}
.explanation p{font-size:0.9em;color:#636e72;line-height:1.6}

/* 结果弹窗 */
.overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.7);display:flex;align-items:center;justify-content:center;z-index:100;opacity:0;visibility:hidden;transition:all 0.3s;backdrop-filter:blur(5px)}
.overlay.show{opacity:1;visibility:visible}
.modal{background:#fff;border-radius:24px;padding:30px;text-align:center;max-width:340px;width:90%;box-shadow:0 20px 60px rgba(0,0,0,0.5)}
.modal h2{font-size:1.5em;margin-bottom:10px}
.result-stars{font-size:2em;margin:10px 0}
.result-score{font-size:1.3em;color:#4ecdc4;font-weight:bold;margin-bottom:10px}

/* 连击效果 */
.combo-toast{position:fixed;top:20%;left:50%;transform:translateX(-50%);background:rgba(78,205,196,0.95);color:#fff;padding:8px 24px;border-radius:30px;font-weight:bold;font-size:1.1em;z-index:200;animation:comboIn 0.6s ease-out forwards;pointer-events:none}
@keyframes comboIn{0%{opacity:0;transform:translateX(-50%) scale(0.5)}50%{opacity:1;transform:translateX(-50%) scale(1.2)}100%{opacity:0;transform:translateX(-50%) scale(1) translateY(-30px)}}

/* 生命值 */
.lost{opacity:0.3}

/* 响应式 */
@media(max-width:400px){
    .nav-grid{gap:8px}
    .nav-card{padding:14px 8px}
    .question-card{padding:16px}
    .stats-row{gap:6px}
}