/* ==================== 基础重置和变量 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-hover: #764ba2;
    --secondary-color: #4a5568;
    --bg-color: #f7fafc;
    --sidebar-bg: #ffffff;
    --chat-bg: #f0f2f5;
    --user-msg-bg: #dcf8c6;
    --ai-msg-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px 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-primary);
    height: 100vh;
    overflow: hidden;
}

/* ==================== 布局容器 ==================== */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* 左侧控制面板 */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow-y: auto;
    box-shadow: var(--shadow);
    flex-shrink: 0;
}

/* 中间交互消息区域 */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--chat-bg);
    min-width: 0;
}

/* 右侧游戏简介栏 */
.info-sidebar {
    width: 320px;
    background-color: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    box-shadow: var(--shadow);
    flex-shrink: 0;
}

.sidebar-header {
    margin-bottom: 15px;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    display: flex;
    padding-top: 10px;
    align-items: center;
    gap: 8px;
}

/* ==================== 右侧游戏简介栏 ==================== */
.info-header {
    padding: 31.5px;
    border-bottom: 1px solid var(--border-color);
    margin: 0 18px;
    background-color: var(--sidebar-bg);
}

.info-header h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.info-content {
    padding: 20px;
    flex: 1;
    overflow-y: auto;
}

.info-section {
    margin-bottom: 24px;
}

.info-section:last-child {
    margin-bottom: 0;
}

.info-section h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.info-section p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: 0;
}

.intro-text {
    font-size: 13px !important;
    line-height: 1.7 !important;
    color: var(--text-primary) !important;
    padding: 12px;
    background-color: rgba(102, 126, 234, 0.05);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
}

.feature-list,
.audience-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li,
.audience-list li {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 16px;
    position: relative;
}

.feature-list li::before,
.audience-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.feature-list li strong {
    color: var(--text-primary);
}

.footer-text {
    margin-top: 74px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.footer-text p {
    color: var(--primary-color) !important;
    text-align: center;
    font-size: 13px !important;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
}

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

.btn-secondary {
    background-color: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
}

#newSessionBtn {
    margin-bottom: 20px;
    padding: 10px 12px;
    /* 与游戏记录按钮保持一致：总宽度减去删除按钮（32px）和间距（8px）*/
    width: calc(100% - 40px);
}

.btn-send {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    font-size: 16px;
}

.btn-send:hover {
    transform: scale(1.05);
}

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 6px;
    background-color: transparent;
    color: var(--text-secondary);
    font-size: 14px;
}

.btn-icon:hover {
    background-color: #fed7d7;
    color: #e53e3e;
}

/* ==================== 会话列表 ==================== */
.session-section {
    margin-bottom: 20px;
}

.session-section h3 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.session-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.session-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.session-btn {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-btn::before {
    content: "🪄";
    flex-shrink: 0;
}

/* ==================== 分割线 ==================== */
.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}

/* ==================== 机器人信息表单 ==================== */
.companion-section h3 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    resize: vertical;
    background-color: var(--sidebar-bg);
    cursor: pointer;
}

.form-group select {
    resize: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23718096' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* ==================== 难度等级单选按钮 ==================== */
.difficulty-options {
    display: flex;
    flex-direction: row;
    gap: 12px;
    align-items: center;
    width: 100%;
}

.radio-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    user-select: none;
    padding: 10px 24px;
    border: 2px solid var(--border-color);
    border-radius: 24px;
    transition: all 0.3s ease;
    background-color: transparent;
    flex: 1;
    text-align: center;
}

.radio-label:hover {
    border-color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.08);
}

.radio-label input[type="radio"] {
    display: none;
}

.radio-custom {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background-color: white;
    border-radius: 50%;
}

.radio-label:has(input[type="radio"]:checked) {
    border-color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    font-weight: 600;
}

/* ==================== 主聊天区域 ==================== */

.chat-header {
    background-color: var(--sidebar-bg);
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.chat-header h1 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.session-name {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ==================== 聊天消息区域 ==================== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 自定义滚动条 */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

/* ==================== 消息气泡 ==================== */
.message {
    display: flex;
    gap: 12px;
    max-width: 80%;
    animation: fadeIn 0.3s ease;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.message.assistant {
    align-self: flex-start;
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
}

.message-content {
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
    box-shadow: var(--shadow);
    word-wrap: break-word;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
    background-color: var(--ai-msg-bg);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

/* ==================== 输入区域 ==================== */
.chat-input-container {
    background-color: var(--sidebar-bg);
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.chat-input-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--chat-bg);
    border-radius: 24px;
    padding: 8px 8px 8px 20px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.chat-input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.chat-input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 14px;
    outline: none;
    color: var(--text-primary);
}

.chat-input::placeholder {
    color: var(--text-secondary);
}

/* ==================== 加载动画 ==================== */
.loading {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 12px 16px;
}

.loading-dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* ==================== 空状态 ==================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state-text {
    font-size: 14px;
}

/* ==================== 主题切换器 ==================== */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    flex: 1;
}

.theme-switcher {
    position: relative;
}

.btn-theme {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    font-size: 18px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-theme:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.theme-dropdown {
    position: absolute;
    top: 50px;
    right: 0;
    background-color: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px;
    box-shadow: var(--shadow-lg);
    display: none;
    min-width: 140px;
    z-index: 1000;
}

.theme-dropdown.show {
    display: block;
    animation: fadeIn 0.2s ease;
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.theme-option:hover {
    background-color: var(--bg-color);
}

.theme-option.active {
    background-color: rgba(102, 126, 234, 0.15);
    position: relative;
}

.theme-option.active::after {
    content: '✓';
    position: absolute;
    right: 12px;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 14px;
}

.theme-color {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.theme-light {
    background-color: #ffffff;
}

.theme-dark {
    background-color: #1a202c;
}

/* ==================== 深色主题 ==================== */
body.theme-dark {
    --bg-color: #1a202c;
    --sidebar-bg: #171923;
    --chat-bg: #171923;
    --ai-msg-bg: #2d3748;
    --border-color: #4a5568;
    --text-primary: #f7fafc;
    --text-secondary: #a0aec0;
}

body.theme-dark .sidebar {
    background-color: #171923;
    border-right-color: #2d3748;
}

body.theme-dark .chat-header {
    background-color: #171923;
    border-bottom-color: #2d3748;
}

body.theme-dark .chat-input-container {
    background-color: #171923;
    border-top-color: #2d3748;
}

body.theme-dark .message.assistant .message-content {
    background-color: #2d3748;
    color: #f7fafc;
}

body.theme-dark .chat-input-wrapper {
    background-color: #2d3748;
    border-color: #4a5568;
}

body.theme-dark .form-group input,
body.theme-dark .form-group textarea,
body.theme-dark .form-group select {
    background-color: #2d3748;
    color: #f7fafc;
    border-color: #4a5568;
}

body.theme-dark .session-btn.btn-secondary {
    background-color: #2d3748;
    color: #f7fafc;
    border-color: #4a5568;
}

body.theme-dark .divider {
    border-top-color: #2d3748;
}

body.theme-dark .theme-dropdown {
    background-color: #171923;
    border-color: #2d3748;
}

body.theme-dark .theme-option.active {
    background-color: rgba(102, 126, 234, 0.25);
}

body.theme-dark .theme-option.active::after {
    color: #a5b4fc;
}

body.theme-dark .radio-label {
    border-color: #4a5568;
    background-color: transparent;
    color: #e2e8f0;
}

body.theme-dark .radio-label:hover {
    border-color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.15);
}

body.theme-dark .radio-custom {
    border-color: #4a5568;
}

body.theme-dark .radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
}

body.theme-dark .radio-label:has(input[type="radio"]:checked) {
    border-color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.2);
    color: #a5b4fc;
}

/* 游戏简介栏暗黑模式 */
body.theme-dark .info-sidebar {
    background-color: #171923;
    border-left-color: #2d3748;
}

body.theme-dark .info-header {
    background-color: #171923;
    border-bottom-color: #2d3748;
}

body.theme-dark .intro-text {
    background-color: rgba(102, 126, 234, 0.1) !important;
}

body.theme-dark .footer-text {
    border-top-color: #2d3748;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -320px;
        height: 100vh;
        z-index: 100;
        transition: left 0.3s ease;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .chat-container {
        width: 100%;
    }
}