* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4F46E5;
    --secondary-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --text-color: #1F2937;
    --text-light: #6B7280;
    --bg-color: #F9FAFB;
    --card-bg: #FFFFFF;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 导航栏 */
.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 16px 0;
    margin-bottom: 30px;
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

/* 卡片 */
.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.card-header {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-color);
}

/* 按钮 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #4338CA;
}

.btn-success {
    background-color: var(--secondary-color);
    color: white;
}

.btn-success:hover {
    background-color: #059669;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-warning {
    background-color: var(--warning-color);
    color: white;
}

.btn-info {
    background-color: #0EA5E9;
    color: white;
}

.btn-info:hover {
    background-color: #0284C7;
}

.btn-secondary {
    background-color: #6B7280;
    color: white;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* 表单 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* 计时器 */
.timer-display {
    font-size: 48px;
    font-weight: bold;
    text-align: center;
    color: var(--primary-color);
    margin: 20px 0;
}

.timer-display.warning {
    color: var(--warning-color);
}

.timer-display.danger {
    color: var(--danger-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

/* 参与者列表 */
.participant-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.participant-item {
    padding: 12px;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.participant-item.active {
    border-color: var(--secondary-color);
    background-color: #D1FAE5;
}

.participant-item.speaking {
    border-color: var(--primary-color);
    background-color: #E0E7FF;
    animation: speakingPulse 2s infinite;
}

@keyframes speakingPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(79, 70, 229, 0);
    }
}

/* 发言记录 */
.speech-list {
    max-height: 400px;
    overflow-y: auto;
}

.speech-item {
    padding: 16px;
    margin-bottom: 12px;
    background-color: var(--bg-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.speech-item.off-topic {
    border-left-color: var(--warning-color);
    background-color: #FEF3C7;
}

.speech-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.speech-name {
    font-weight: 600;
    color: var(--text-color);
}

.speech-time {
    font-size: 12px;
    color: var(--text-light);
}

.speech-content {
    color: var(--text-color);
    line-height: 1.6;
}

/* AI总结 */
.ai-summary {
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    margin: 20px 0;
}

.ai-summary-header {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ai-summary-content {
    line-height: 1.8;
    white-space: pre-wrap;
}

/* 控制面板 */
.control-panel {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
}

/* 状态徽章 */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary {
    background-color: #DBEAFE;
    color: #1E40AF;
}

.badge-success {
    background-color: #D1FAE5;
    color: #065F46;
}

.badge-warning {
    background-color: #FEF3C7;
    color: #92400E;
}

.badge-danger {
    background-color: #FEE2E2;
    color: #991B1B;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 隐藏元素 */
.hidden {
    display: none !important;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .card {
        padding: 16px;
    }

    .timer-display {
        font-size: 36px;
    }

    .participant-list {
        grid-template-columns: 1fr;
    }
}