/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* 动态背景 */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

#app {
    width: 100%;
    max-width: 1200px;
}

/* 屏幕样式 */
.screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hidden {
    display: none !important;
}

/* 卡片样式 */
.card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 800px;
    text-align: center;
    margin-bottom: 20px;
}

.mode-select-wrapper {
    display: flex;
    gap: 28px;
    width: 100%;
    justify-content: center;
    align-items: stretch;
}

.mode-card {
    max-width: 370px;
    min-width: 280px;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.mode-rule {
    text-align: left;
    font-size: 1rem;
    margin: 16px 0 24px 0;
    line-height: 1.6;
    color: #2980b9;
    border-radius: 10px;
    background: rgba(41,128,185,0.08);
    padding: 12px;
}
.mode-desc-title {
    font-weight: 600;
    color: #e67e22;
}
.mode-tip {
    font-size: 1.1rem;
    color: #27ae60;
    font-weight: bold;
    margin-bottom: 10px;
}
.game-over-round-tip {
    margin: 0 0 12px 0;
    color: #e67e22;
    font-size: 1.1rem;
    font-weight: bold;
}

/* 标题样式 */
h1, h2, h3, p {
    margin-bottom: 20px;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(45deg, #3498db, #e74c3c);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    background-size: 200% auto;
    animation: textShine 3s ease-in-out infinite;
}

@keyframes textShine {
    to { background-position: 200% center; }
}

/* 按钮样式 */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
}

.primary-btn, .secondary-btn {
    padding: 12px 25px;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
}

.primary-btn {
    background: linear-gradient(45deg, #3498db, #2980b9);
    color: white;
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

.secondary-btn {
    background: linear-gradient(45deg, #ecf0f1, #bdc3c7);
    color: #2c3e50;
}

.secondary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(189, 195, 199, 0.4);
}

.mode-choose-btn {
    margin-top: 16px;
    width: 80%;
    font-size: 1.08rem;
    min-width: 180px;
}

/* 游戏界面样式 */
.status-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.status-item {
    background: rgba(0, 0, 0, 0.05);
    padding: 10px 15px;
    border-radius: 20px;
    font-weight: 500;
}

.progress-container {
    width: 100%;
    height: 10px;
    background-color: #ecf0f1;
    border-radius: 5px;
    margin-bottom: 30px;
    overflow: hidden;
}

.progress-bar {
    width: 100%;
    height: 100%;
    position: relative;
}

.progress-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, #2ecc71, #3498db);
    transition: width 1s linear;
}

.game-content {
    display: flex;
    gap: 20px;
    width: 100%;
}

.question-section {
    flex: 1;
    min-width: 300px;
}

#question {
    font-size: 1.2rem;
    margin-bottom: 25px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 12px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.option {
    padding: 15px;
    border: 2px solid #bdc3c7;
    border-radius: 12px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.option:hover {
    border-color: #3498db;
    background: rgba(52, 152, 219, 0.05);
    transform: translateX(5px);
}

.option.correct {
    background: rgba(46, 204, 113, 0.2);
    border-color: #27ae60;
}

.option.incorrect {
    background: rgba(231, 76, 60, 0.2);
    border-color: #c0392b;
}

/* 反馈和解析样式 */
#feedback {
    padding: 15px;
    border-radius: 12px;
    margin-top: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.feedback-correct {
    background: rgba(46, 204, 113, 0.2);
    color: #27ae60;
    animation: fadeIn 0.5s ease;
}

.feedback-incorrect {
    background: rgba(231, 76, 60, 0.2);
    color: #c0392b;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.explanation-section {
    flex: 1;
    min-width: 300px;
}

.explanation-card {
    max-height: 500px;
    overflow-y: auto;
}

#explanation-list {
    text-align: left;
}

.explanation-item {
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.03);
    border-left: 4px solid #3498db;
    animation: fadeIn 0.4s;
}

.explanation-item.correct {
    border-left-color: #27ae60;
}

.explanation-item.incorrect {
    border-left-color: #c0392b;
}

.explanation-item + .explanation-item {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.explanation-question {
    font-weight: bold;
    margin-bottom: 5px;
}

.explanation-text {
    font-size: 0.95rem;
    color: #34495e;
}

/* 解析中的描述样式区分 */
.explanation-desc, .knowledge-desc {
    font-style: italic;
    color: #2d80b3;
    font-weight: 500;
    word-break: break-word;
    transition: color 0.35s;
}

.explanation-item.correct .explanation-desc,
.explanation-item.correct .knowledge-desc {
    color: #27ae60;
}
.explanation-item.incorrect .explanation-desc,
.explanation-item.incorrect .knowledge-desc {
    color: #c0392b;
}

/* 排行榜样式 */
.score-list {
    list-style: none;
    margin: 20px 0;
    max-height: 350px;
    overflow-y: auto;
    padding-right: 10px;
}

.score-list li {
    background: rgba(0, 0, 0, 0.05);
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.score-list li:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: #3498db;
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.score-list li:hover {
    transform: translateX(5px);
    background: rgba(0, 0, 0, 0.08);
}

.score-list li:hover:before {
    transform: scaleY(1);
}

.score-list li:first-child {
    background: rgba(241, 196, 15, 0.2);
    border: 2px solid #f1c40f;
}

.score-list li:first-child:before {
    background: #f1c40f;
}

/* 排行榜筛选 */
.leaderboard-filter {
    margin: 20px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#library-filter, #leaderboard-mode-filter {
    padding: 8px 15px;
    border-radius: 20px;
    border: 1px solid #ddd;
    background: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

#library-filter:hover, #leaderboard-mode-filter:hover {
    border-color: #3498db;
    box-shadow: 0 2px 5px rgba(52, 152, 219, 0.1);
}

/* 弹窗样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 15px;
    max-width: 500px;
    width: 90%;
    position: relative;
    transform: translateY(-20px);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.modal:not(.hidden) .modal-content {
    transform: translateY(0);
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.close-modal:hover {
    color: #e74c3c;
    transform: rotate(90deg);
}

/* 庆祝消息 */
.celebration {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    background: linear-gradient(45deg, #f1c40f, #f39c12);
    color: white;
    padding: 30px 60px;
    border-radius: 15px;
    font-size: 2rem;
    font-weight: bold;
    z-index: 1001;
    box-shadow: 0 10px 30px rgba(241, 196, 15, 0.5);
    opacity: 0;
    transition: all 0.5s ease;
    text-align: center;
    background-size: 200% auto;
    animation: celebrationShine 3s ease-in-out infinite;
}

@keyframes celebrationShine {
    to { background-position: 200% center; }
}

.celebration:not(.hidden) {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* 版本信息 */
.version-info {
    margin-bottom: 20px;
    color: #7f8c8d;
    font-size: 0.9rem;
    text-align: center;
}

.version-separator {
    margin: 0 8px;
}

/* 题库选择界面样式 */
.library-list {
    margin: 25px 0;
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.library-item {
    padding: 15px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid transparent;
}

.library-item:hover {
    background: rgba(52, 152, 219, 0.1);
    transform: translateX(5px);
    border-left-color: #3498db;
}

.library-item.selected {
    background: rgba(52, 152, 219, 0.2);
    border-left: 4px solid #3498db;
}

.library-meta {
    font-size: 0.9rem;
    color: #7f8c8d;
}

/* 文件上传区域样式 */
.file-upload-section {
    margin: 20px 0;
    padding: 20px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.03);
    transition: all 0.3s ease;
}

.file-upload-section:hover {
    background: rgba(0, 0, 0, 0.05);
}

#library-file-input {
    display: none;
}

.upload-area {
    margin: 15px 0;
    padding: 30px 10px;
    border: 2px dashed #bdc3c7;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.upload-area:hover {
    border-color: #3498db;
    background: rgba(52, 152, 219, 0.05);
}

.upload-area.dragover {
    border-color: #2ecc71;
    background: rgba(46, 204, 113, 0.1);
}

.upload-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: #7f8c8d;
}

.upload-text i {
    font-size: 2rem;
}

.small-text {
    font-size: 0.8rem;
    color: #7f8c8d;
    text-align: center;
}

/* 最终得分样式 */
.final-score {
    font-size: 3rem;
    font-weight: bold;
    background: linear-gradient(45deg, #e74c3c, #f39c12, #f1c40f, #2ecc71, #3498db);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    background-size: 400% auto;
    animation: scoreShine 5s ease-in-out infinite;
    margin: 20px 0;
}

@keyframes scoreShine {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 通知提示样式 */
.notification-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.notification {
    padding: 15px 20px;
    border-radius: 8px;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 280px;
    max-width: 400px;
    animation: slideIn 0.3s ease-out forwards, fadeOut 0.3s ease-in forwards 2.7s;
}

.notification.success {
    background: linear-gradient(45deg, #27ae60, #2ecc71);
}

.notification.error {
    background: linear-gradient(45deg, #c0392b, #e74c3c);
}

.notification.info {
    background: linear-gradient(45deg, #2980b9, #3498db);
}

.notification.warning {
    background: linear-gradient(45deg, #d35400, #f39c12);
}

.notification .close-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1rem;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* 控制按钮样式 */
.control-buttons {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 900;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-btn {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    /* justify-content: center; */
    justify-content: flex-start;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    overflow: hidden;
    position: relative;
}

.icon-wrap {
    width: 50px;
    height: 50px;
    min-width: 50px;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn .control-icon {
    font-size: 1.5rem;
    color: #3498db;
    transition: color 0.3s;
    display: inline-block;
}

.control-btn:hover {
    width: 180px;
    background: linear-gradient(45deg, #3498db, #2980b9);
    color: white;
}

.control-btn:hover .control-icon {
    color: #fff;
}

.control-btn .control-text {
    opacity: 0;
    transition: opacity 0.3s ease;
    margin-left: 10px;
    white-space: nowrap;
}

.control-btn:hover .control-text {
    opacity: 1;
}

/* 保证控制按钮图标在缩略模式下可见 */
.control-btn .control-icon {
    opacity: 1 !important;
    visibility: visible !important;
}

/* 知识卡片样式 */
.knowledge-card {
    margin-top: 30px;
    padding: 20px;
    background: rgba(52, 152, 219, 0.05);
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    position: relative;
}

.knowledge-card:hover {
    background: rgba(52, 152, 219, 0.1);
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.1);
}

.knowledge-card h3 {
    margin-bottom: 15px;
    color: #3498db;
    text-align: left;
}

.knowledge-content {
    line-height: 1.6;
    transition: opacity 0.4s cubic-bezier(0.4,0,0.2,1);
    opacity: 1;
}

.knowledge-content.fade-out {
    opacity: 0;
}

.knowledge-content.fade-in {
    opacity: 1;
}

.knowledge-desc {
    font-style: italic;
    color: #2d80b3;
    font-weight: 500;
    transition: color 0.35s;
}

.knowledge-content p {
    margin-bottom: 10px;
    text-align: left;
}

/* 加载中界面元素居中对齐 */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    flex-direction: column;
    gap: 20px;
}

.loading-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(52, 152, 219, 0.2);
    border-top: 5px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: 1.2rem;
    color: #34495e;
    text-align: center;
}

.loading-library {
    font-size: 1rem;
    color: #7f8c8d;
    text-align: center;
}

/* 排行榜容器 */
.leaderboard-container {
    display: flex;
    gap: 20px;
    width: 100%;
}

.leaderboard-card {
    flex: 1;
}

.leaderboard-explanation {
    flex: 1;
    max-height: 600px;
    overflow-y: auto;
}

/* 响应式调整 */
@media (max-width: 899px) {
    body {
        padding-bottom: 80px;
    }
    .mode-select-wrapper {
        flex-direction: column;
        gap: 18px;
    }
    .game-content {
        flex-direction: column;
    }
    .status-bar {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    .card {
        padding: 20px;
        max-width: 100%;
    }
    h1 {
        font-size: 2rem;
    }
    .leaderboard-filter {
        flex-direction: column;
    }
    .leaderboard-container {
        flex-direction: column;
    }
    .control-btn:hover {
        width: 150px;
    }
    .explanation-card {
        max-height: 300px;
    }
    .control-btn {
        width: 50px !important;
        min-width: 50px !important;
        justify-content: flex-start !important;
    }
    .icon-wrap {
        width: 50px !important;
        min-width: 50px !important;
        height: 50px !important;
        min-height: 50px !important;
    }
}