/* ==================== CSS变量定义 ==================== */
:root {
  /* 主题色 */
  --color-primary: #ad1e23;
  --color-primary-light: rgba(173, 30, 35, 0.1);
  --color-primary-dark: #99171c;
  --color-primary-darker: #891317;

  /* 灰度色 */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;

  /* 功能色 */
  --color-success: #16a34a;
  --color-error: #dc2626;
  --color-white: #ffffff;
  --color-black: #000000;

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

/* ==================== 全局重置 ==================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  color: black;
  background-size: 200% 200%;
  animation: backgroundShift 20s ease infinite;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* 网格纹理叠加 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(rgba(173, 30, 35, 0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(173, 30, 35, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  opacity: 0.3;
  z-index: 0;
}

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

/* ==================== 布局容器 ==================== */
.app-container {
  width: 100%;
  min-height: 100vh;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* ==================== 头部样式 ==================== */
.header {
  width: 100%;
  max-width: 1600px;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.header-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-image {
  height: 64px;
  width: 64px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  transition: all 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.logo-image:hover {
  transform: rotate(360deg) scale(1.1);
  box-shadow: 0 8px 24px rgba(173, 30, 35, 0.3), 0 0 40px rgba(173, 30, 35, 0.2);
}

.logo-text {
  height: 64px;
  transition: transform var(--transition-normal);
}

/* 导航 */
.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--color-black);
  text-decoration: none;
  transition: all var(--transition-normal);
  font-weight: 500;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--color-primary);
  transform: translateY(-2px);
}

.nav-link:hover::after {
  width: 100%;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm);
  background: var(--color-primary-light);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: rgba(173, 30, 35, 0.2);
}

/* 移动端导航 */
.mobile-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideDown 0.3s ease-out;
}

.mobile-nav.hidden {
  display: none;
}

.mobile-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.mobile-nav-link {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-primary-light);
  color: var(--color-black);
  text-decoration: none;
  border-radius: var(--radius-full);
  font-size: 14px;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
  background: rgba(173, 30, 35, 0.2);
  color: var(--color-primary);
}

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

/* ==================== 主内容区 ==================== */
.main-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  width: 100%;
  max-width: 1600px;
}

/* ==================== 聊天区域 ==================== */
.chat-section {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 32px rgba(173, 30, 35, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-header {
  padding: var(--spacing-md);
  background: rgb(255 184 187 / 10%);
  text-align: center;
}

.chat-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-darker);
  margin-bottom: var(--spacing-sm);
}

.connection-status {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

.connection-status.connected {
  color: var(--color-success);
}

.connection-status.error {
  color: var(--color-error);
}

/* 消息列表 */
.chat-messages {
  height: 500px;
  padding: var(--spacing-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.chat-messages::-webkit-scrollbar {
  width: 10px;
}

.chat-messages::-webkit-scrollbar-track {
  background: rgba(173, 30, 35, 0.05);
  border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #f7cdce 20%, var(--color-primary-light) 50%);
  border-radius: 10px;
  transition: all 0.3s ease;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-light);
  box-shadow: 0 0 10px rgba(173, 30, 35, 0.5);
}

/* 消息项 */
.message {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  max-width: 80%;
  animation: messageSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes messageSlideIn {
  0% {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.message.user .message-avatar {
  background: var(--color-gray-50);
}

.message-content {
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.message.assistant .message-content {
  background: var(--color-primary-light);
  border-top-left-radius: 0;
}

.message.user .message-content {
  background: var(--color-gray-100);
  border-top-right-radius: 0;
}

/* Markdown样式 */
.message-text {
  line-height: 1.6;
}

.message-text h1,
.message-text h2,
.message-text h3 {
  margin-top: 1em;
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.25;
}

.message-text h1 {
  font-size: 2em;
}
.message-text h2 {
  font-size: 1.5em;
}
.message-text h3 {
  font-size: 1.25em;
}

.message-text p {
  margin-bottom: 1em;
}

.message-text ul,
.message-text ol {
  margin-bottom: 1em;
  padding-left: 2em;
}

.message-text li {
  margin-bottom: 0.25em;
}

.message-text code {
  background-color: rgba(0, 0, 0, 0.05);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.9em;
}

.message-text pre {
  background-color: #f6f8fa;
  border-radius: var(--radius-md);
  padding: 1em;
  overflow-x: auto;
  margin-bottom: 1em;
}

.message-text pre code {
  background-color: transparent;
  padding: 0;
  font-size: 0.875em;
  line-height: 1.45;
}

/* 表格样式 */
.message-text table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 1em;
  border: 1px solid var(--color-gray-300);
}

.message-text table th,
.message-text table td {
  border: 1px solid var(--color-gray-300);
  padding: 8px 12px;
  text-align: left;
}

.message-text table th {
  background-color: var(--color-gray-100);
  font-weight: 600;
  color: var(--color-gray-700);
}

.message-text table tr:nth-child(even) {
  background-color: var(--color-gray-50);
}

.message-text table tr:hover {
  background-color: rgba(173, 30, 35, 0.05);
}

.message-text blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: 1em;
  margin-left: 0;
  margin-bottom: 1em;
  color: var(--color-gray-500);
}

.message-text a {
  color: var(--color-primary);
  text-decoration: none;
}

.message-text a:hover {
  text-decoration: underline;
}

/* 流式输入动画 */
.message-text.streaming::after {
  content: "▋";
  animation: cursorBlink 1s step-end infinite;
  margin-left: 2px;
  color: var(--color-primary);
  filter: drop-shadow(0 0 4px rgba(173, 30, 35, 0.5));
}

@keyframes cursorBlink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0;
  }
}

/* 参考来源 */
.message-sources {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-gray-200);
}

.message-sources h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary-darker);
  margin-bottom: var(--spacing-sm);
}

.source-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  list-style: none;
}

.source-item {
  position: relative;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  height: 32px;
  min-width: 120px;
  max-width: fit-content;
}

.source-item:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 24px rgba(173, 30, 35, 0.2), 0 0 20px rgba(173, 30, 35, 0.1);
}

/* 源图标样式 (替代序号) */
.source-icon {
  color: var(--color-primary);
  flex-shrink: 0;
  font-size: 12px;
  display: flex;
  align-items: center;
}

.source-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-gray-600);
  font-size: 13px;
  max-width: 100px;
}

/* 源链接容器 */
.source-link-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

.source-link-wrapper:hover {
  color: var(--color-primary);
}

.source-link-wrapper:hover .source-icon {
  color: var(--color-primary);
}

.source-link-wrapper:hover .source-title {
  color: var(--color-primary);
}

/* 源预览框 */
.source-preview {
  position: absolute;
  width: 200px;
  height: 300px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-md);
  font-size: 12px;
  line-height: 1.4;
  color: var(--color-gray-700);
  overflow-y: auto;
  z-index: 1000;
  display: none;
  bottom: 100%;
  left: 0;
  margin-bottom: -1px;
  animation: tooltipFadeIn 0.3s ease;
}

@keyframes tooltipFadeIn {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.source-preview::-webkit-scrollbar {
  width: 6px;
}

.source-preview::-webkit-scrollbar-track {
  background: var(--color-gray-50);
  border-radius: var(--radius-sm);
}

.source-preview::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-sm);
}

.source-preview::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

.source-item:hover .source-preview {
  display: block;
}

/* ==================== 输入区域 ==================== */
.chat-input {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-gray-200);
}

.input-wrapper {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.input-field {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
}

.input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  transform: scale(1.02);
  box-shadow: 0 0 0 4px rgba(173, 30, 35, 0.1), 0 8px 24px rgba(173, 30, 35, 0.15);
  animation: focusRing 1.5s ease-out;
}

@keyframes focusRing {
  0% {
    box-shadow: 0 0 0 0 rgba(173, 30, 35, 0.4);
  }
  100% {
    box-shadow: 0 0 0 8px rgba(173, 30, 35, 0);
  }
}

.btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 涟漪效果 */
.btn::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::after {
  width: 300px;
  height: 300px;
}

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

.btn-primary:hover {
  background: var(--color-primary-darker);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(173, 30, 35, 0.25), 0 0 20px rgba(173, 30, 35, 0.15);
}

.btn-secondary {
  background: var(--color-gray-200);
  color: var(--color-gray-700);
}

.btn-secondary:hover {
  background: var(--color-gray-300);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 快捷话题 */
.quick-topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.topic-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-primary-light);
  color: var(--color-black);
  border: none;
  border-radius: var(--radius-full);
  font-size: 14px;
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
  overflow: hidden;
}

/* 渐变边框效果 */
.topic-btn::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(45deg, var(--color-primary), var(--color-primary-light), var(--color-primary));
  background-size: 200% 200%;
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s ease;
  animation: gradientShift 3s ease infinite;
}

.topic-btn:hover {
  background: rgba(173, 30, 35, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(173, 30, 35, 0.2);
}

.topic-btn:hover::before {
  opacity: 1;
}

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

/* ==================== 侧边栏 ==================== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.sidebar-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: 0 8px 32px rgba(173, 30, 35, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 悬停光晕效果 */
.sidebar-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(173, 30, 35, 0.15) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
}

.sidebar-card:hover {
  box-shadow: 0 12px 40px rgba(173, 30, 35, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transform: translateY(-4px);
}

.sidebar-card:hover::before {
  opacity: 1;
  animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

.sidebar-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-darker);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.sidebar-card p {
  color: var(--color-black);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.sidebar-card a {
  color: var(--color-black);
  text-decoration: none;
  font-weight: 450;
  transition: color var(--transition-fast);
}

.sidebar-card a:hover {
  color: var(--color-primary-dark);
}

.sidebar-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.sidebar-card li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* 特殊卡片 */
.sidebar-card.gradient {
  background: linear-gradient(to right, rgb(255 244 244 / 10%), rgb(255 255 255 / 5%));
  color: var(--color-primary-darker);
}

/* ==================== 页脚 ==================== */
.footer {
  margin-top: var(--spacing-2xl);
  text-align: center;
  color: var(--color-gray-500);
  font-size: 0.875rem;
}

.footer-links {
  margin-top: var(--spacing-sm);
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* ==================== 工具类 ==================== */
.hidden {
  display: none !important;
}

/* 涟漪效果样式 */
.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  transform: scale(0);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* 滚动淡入效果 */
.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.fade-in-on-scroll.fade-in-visible {
  opacity: 1;
  transform: translateY(0);
}

/* GPU加速优化 */
.gpu-accelerated {
  transform: translateZ(0);
  will-change: transform, opacity;
}

/* ==================== 响应式设计 ==================== */
/* 平板及以上 */
@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }

  .mobile-menu-btn {
    display: none;
  }
}

/* 桌面端 */
@media (min-width: 1024px) {
  .main-content {
    flex-direction: row;
  }

  .chat-section {
    flex: 2;
  }

  .sidebar {
    flex: 1;
  }

  .message {
    max-width: 60%;
  }
}

/* 移动端优化 */
@media (max-width: 767px) {
  .app-container {
    padding: var(--spacing-md);
  }

  .header {
    margin-bottom: var(--spacing-md);
  }

  .chat-messages {
    height: 400px;
  }

  .message {
    max-width: 90%;
  }

  .source-item {
    padding: 4px 8px;
    height: 28px;
    min-width: 100px;
  }

  .source-title {
    font-size: 12px;
    max-width: 80px;
  }

  .source-icon {
    font-size: 11px;
  }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
  .mobile-nav-link,
  .topic-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .btn {
    min-width: 44px;
    min-height: 44px;
  }
}

/* 大屏幕优化 */
@media (min-width: 1600px) {
  .header,
  .main-content {
    max-width: 1600px;
  }
}

/* 打印样式 */
@media print {
  .header,
  .chat-input,
  .sidebar,
  .footer {
    display: none;
  }

  .chat-messages {
    height: auto;
    overflow: visible;
  }

  .message {
    max-width: 100%;
    page-break-inside: avoid;
  }
}