:root {
    --primary-color: #3B82F6;
    --secondary-color: #6366F1;
    --accent-color: #F472B6;
    --text-color: #111827;
    --text-light: #6B7280;
    --light-bg: #F9FAFB;
    --card-bg: #FFFFFF;
    --border-color: #E5E7EB;
    --dark-bg: #121212;
    --dark-card-bg: #1E1E1E;
    --dark-border: #333333;
    --sidebar-width: 320px;
    --header-height: 60px;
    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --sidebar-blur: blur(16px);
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'Fira Code', monospace;
}

body {
    font-family: var(--font-sans);
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--light-bg);
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

.chat-container {
    width: 100%;
    margin: 0;
    background-color: var(--card-bg);
    border-radius: 0;
    box-shadow: none;
    height: calc(100vh - 80px); /* 减去输入区高度 */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
}

.messages {
    flex: 1;
    padding: 20px;
    margin: 0;
    overflow-y: auto;
    background-color: var(--light-bg);
    font-size: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
}

.messages::-webkit-scrollbar {
    width: 6px;
}

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

.messages::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 3px;
    opacity: 0.5;
}

.messages::-webkit-scrollbar-thumb:hover {
    opacity: 0.8;
}

.message {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
}

.message-content {
    padding: 18px 24px;
    border-radius: var(--radius-lg);
    max-width: 75%;
    font-size: 16px;
    line-height: 1.8;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    word-wrap: break-word;
}

.message-content .title {
    font-size: 1.3em;
    font-weight: bold;
    display: block;
    margin: 16px 0 12px 0;
    color: #333;
}

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

.message.user .message-content {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: right;
    transform: translateX(5px);
    animation: slideInRight 0.3s ease forwards;
    border-top-right-radius: 4px;
    margin-left: 20px;
    margin-bottom: 20px;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.message.bot .message-content {
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    transform: translateX(-5px);
    animation: slideInLeft 0.3s ease forwards;
    border-top-left-radius: 4px;
    margin-right: 20px;
    margin-bottom: 20px;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.input-container {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    gap: 16px;
    align-items: center;
    padding: 16px 24px;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -4px 12px rgba(0,0,0,0.05);
    z-index: 100;

    .input-group {
        display: flex;
        gap: 12px;
        align-items: center;
        flex: 1;
    }
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    background-color: var(--light-bg);
    border-radius: 8px;
    padding: 0 10px;
}

.input-tools {
    display: flex;
    gap: 8px;
}

.tool-btn {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 16px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    opacity: 0.9;
    transition: all 0.2s ease;
}

.tool-btn:hover {
    opacity: 1;
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.send-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.send-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-md);
}

#chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 16px;
    background-color: var(--light-bg);
    transition: var(--transition-normal);
}

#chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    transform: translateY(-1px);
}

.model-select {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 16px;
    background-color: var(--light-bg);
    margin-right: 8px;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.model-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.input-container input {
    flex: 1;
    min-width: 0;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
}

.input-container button {
    padding: 10px 18px;
    min-width: 60px;
    white-space: nowrap;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.input-container button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.input-container button:hover {
    background-color: #0056b3;
    backdrop-filter: blur(80px);
}

/* Media query for small screens */
@media (max-width: 768px) {
    .chat-container {
        margin: 1vh auto;
        height: 98vh;
        border-radius: 0;
    }

    .message-content {
        max-width: 90%;
        padding: 12px 16px;
    }

    .input-container {
        padding: 12px 16px;
        gap: 12px;
    }

    .messages {
        padding: 20px;
        font-size: 15px;
    }

    .input-container {
        gap: 8px;
    }

    .input-container input {
        font-size: 14px;
    }

    .input-container button {
        padding: 8px 12px;
        font-size: 14px;
    }

    .message-content {
        font-size: 15px;
        max-width: 100%;
    }
}

/* 添加下拉菜单样式 */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    bottom: 100%;
    right: 0;
    background-color: #fff;
    min-width: 160px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    z-index: 1;
    margin-bottom: 10px;
}

.dropdown-content.show {
    display: block;
}

.dropdown-item {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.dropdown-item:hover {
    background-color: #f8f9fa;
}

/* 深色模式样式 */
.dark-mode .model-select {
    background-color: #383838;
    border-color: #444;
    color: #fff;
}
.dark-mode #chat-input {
    background-color: #383838;
    border-color: #444;
    color: #fff;
}
body.dark-mode {
    background-color: #1a1a1a;
}

.dark-mode .chat-container {
    background-color: #2d2d2d;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(80px);
}

.dark-mode .messages {
    background-color: #383838;
    border-color: #444;
    color: #fff;
    backdrop-filter: blur(80px);
}

.dark-mode .message.bot .message-content {
    background-color: #2D2D2D;
    color: #fff;
}

.dark-mode .message.user .message-content {
    background-color: #0056b3;
    backdrop-filter: blur(80px);
}

.dark-mode .input-container input {
    background-color: #383838;
    border-color: #444;
    color: #fff;
}

.dark-mode .dropdown-content {
    background-color: #2d2d2d;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.dark-mode .dropdown-item {
    color: #fff;
}

.dark-mode .dropdown-item:hover {
    background-color: #383838;
}

/* 段落样式 */
.message-content p {
    margin: 10px 0;
    line-height: 1.6;
}

.message-content pre {
    background-color: rgba(175, 184, 193, 0.2);
    border-radius: var(--radius-sm);
    padding: 16px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    margin: 16px 0;
}

.message-content blockquote {
    border-left: 3px solid var(--primary-color);
    padding: 10px 15px;
    margin: 16px 0;
    background-color: rgba(59, 130, 246, 0.05);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.message-content ul,
.message-content ol {
    padding-left: 24px;
    margin: 12px 0;
}

.message-content li {
    margin: 6px 0;
}

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.message-content h5,
.message-content h6 {
    margin: 20px 0 12px 0;
    font-weight: 600;
    color: var(--primary-color);
}

.message-content h1 {
    font-size: 1.8em;
}

.message-content h2 {
    font-size: 1.5em;
}

.message-content h3 {
    font-size: 1.3em;
}

.message-content h4,
.message-content h5,
.message-content h6 {
    font-size: 1.1em;
}

.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

.message-content th,
.message-content td {
    padding: 10px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.message-content th {
    background-color: rgba(175, 184, 193, 0.1);
    font-weight: 600;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.2em 0.4em;
    border-radius: 4px;
    background-color: rgba(175, 184, 193, 0.2);
}

.dark-mode .message-content p {
    color: #fff;
}

.dark-mode .message-content pre {
    background-color: rgba(30, 41, 59, 0.8);
}

.dark-mode .message-content code {
    background-color: rgba(30, 41, 59, 0.8);
}

/* 调整标题和段落样式 */
.message-content .title {
    font-size: 1.3em;
    font-weight: bold;
    display: block;
    margin: 16px 0 12px 0;
    color: #333;
}

.message-content p {
    margin: 10px 0;
    line-height: 1.6;
}

.dark-mode .message-content .title {
    color: #fff;
}

/* 粗体文本样式 */
.message-content .bold-text {
    font-weight: bold;
    font-size: 1.1em;
    color: #333;
}

/* 段落标题样式 */
.message-content .section-title {
    font-size: 1.1em;
    font-weight: bold;
    margin: 16px 0 8px 0;
}

/* 子段落样式 */
.message-content .subsection {
    margin: 8px 0 8px 20px;
}

/* 正文样式 */
.message-content .subtitle {
    font-weight: bold;
}

/* 深色模式适配 */
.dark-mode .message-content .bold-text,
.dark-mode .message-content .section-title,
.dark-mode .message-content .subtitle,
.dark-mode .message-content p {
    color: #fff;
}

.loading {
    text-align: center;
    padding: 15px;
    color: var(--text-light);
    font-weight: 500;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.loading::before {
    content: '';
    width: 20px;
    height: 20px;
    border: 3px solid rgba(107, 114, 128, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

.loading::after {
    content: '';
    width: 24px;
}

/* 侧边栏样式优化 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--card-bg), var(--light-bg));
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    padding: 25px;
    box-sizing: border-box;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
    border-right: 1px solid var(--border-color);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 3px;
    opacity: 0.5;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    opacity: 0.8;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar-header {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header::before {
    content: "⚙️";
    font-size: 20px;
}

.param-group {
    margin-bottom: 25px;
    animation: fadeIn 0.4s ease-out;
}

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

.param-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
}

.param-value {
    font-size: 14px;
    color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.param-input,
.param-slider {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--light-bg);
    transition: all 0.2s ease;
    font-family: inherit;
}

.param-input:focus,
.param-slider:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.param-slider {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    padding: 0;
    background: #e0e0e0;
}

.param-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 3px solid white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: all 0.15s ease;
}

.param-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 3px 8px rgba(0,0,0,0.3);
}

.sidebar-toggle {
    position: fixed;
    right: 20px;
    top: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: transparent;
    border: none;
    color: #666;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: var(--transition-fast);


.sidebar-toggle:hover {
    background-color: rgba(0,0,0,0.05);
    color: #333;
}

.sidebar-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.2s ease;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-close:hover {
    color: var(--text-color);
    background-color: var(--light-bg);
}

/* 暗色模式适配 */
.dark-mode .sidebar {
    background-color: var(--dark-card-bg);
}

.dark-mode .param-input,
.dark-mode .param-slider {
    background-color: var(--dark-bg);
    border-color: var(--dark-border);
}

.dark-mode .param-label {
    color: #e2e8f0;
}

.dark-mode .sidebar-close:hover {
    background-color: var(--dark-border);
}

@media (max-width: 900px) {
    .sidebar {
        width: 90vw;
        padding: 18px 10px 10px 10px;
    }
    .sidebar-toggle {
        left: 10px;
        top: 10px;
        width: 40px;
        height: 40px;
        font-size: 1.2em;
    }
}
}