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

/* ====== 访问密码门 ====== */
.gate-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  background: linear-gradient(135deg, #E8F0EB 0%, #F6F4F0 50%, #F5E8E6 100%);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.gate-overlay.active {
  display: flex;
}

.gate-card {
  width: 100%;
  max-width: 360px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 40px 32px 32px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.gate-logo {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-size: 28px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gate-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.gate-sub {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.gate-card input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s;
  text-align: center;
}

.gate-card input:focus {
  border-color: var(--color-primary);
}

.gate-error {
  min-height: 18px;
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-error);
}

.gate-btn {
  width: 100%;
  margin-top: 4px;
  padding: 12px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.gate-btn:hover {
  background: var(--color-primary-dark);
}

:root {
  --color-primary: #6B9080;
  --color-primary-light: #A4C3B2;
  --color-primary-dark: #4F6F61;
  --color-bg: #F6F4F0;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F0EDE8;
  --color-text: #2D2D2D;
  --color-text-secondary: #6B6B6B;
  --color-text-light: #9B9B9B;
  --color-accent: #CC8B86;
  --color-border: #E5E0D8;
  --color-error: #D65D6E;
  --color-user-bubble: #6B9080;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

/* ====== 登录页 ====== */
  --color-primary: #6B9080;
  --color-primary-light: #A4C3B2;
  --color-primary-dark: #4F6F61;
  --color-bg: #F6F4F0;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F0EDE8;
  --color-text: #2D2D2D;
  --color-text-secondary: #6B6B6B;
  --color-text-light: #9B9B9B;
  --color-accent: #CC8B86;
  --color-border: #E5E0D8;
  --color-error: #D65D6E;
  --color-user-bubble: #6B9080;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

html, body {
  height: 100%;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  line-height: 1.6;
}

/* ====== 登录页 ====== */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #E8F0EB 0%, #F6F4F0 50%, #F5E8E6 100%);
}

.login-container {
  width: 100%;
  max-width: 420px;
  padding: 20px;
}

.login-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  font-size: 32px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 16px rgba(107,144,128,0.3);
}

.login-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.login-subtitle {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.login-form {
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 18px;
}

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

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-group input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(107,144,128,0.12);
}

.login-error {
  color: var(--color-error);
  font-size: 13px;
  min-height: 18px;
  margin-bottom: 8px;
  text-align: center;
}

.btn-login {
  width: 100%;
  padding: 13px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-login:hover {
  background: var(--color-primary-dark);
}

.btn-login:active {
  transform: scale(0.98);
}

.login-hint {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-light);
  padding: 12px;
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.login-hint code {
  background: rgba(107,144,128,0.1);
  color: var(--color-primary-dark);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 12px;
}

.login-footer {
  text-align: center;
  font-size: 12px;
  color: var(--color-text-light);
  line-height: 1.8;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

/* ====== 聊天页 ====== */
.chat-page {
  height: 100vh;
  overflow: hidden;
}

.app-container {
  display: flex;
  height: 100vh;
}

/* 侧边栏 */
.sidebar {
  width: 240px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

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

.sidebar-menu {
  flex: 1;
  padding: 12px;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.2s, color 0.2s;
}

.menu-item:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.menu-item.active {
  background: rgba(107,144,128,0.1);
  color: var(--color-primary-dark);
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.user-name {
  font-size: 13px;
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-logout {
  border: none;
  background: transparent;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  transition: background 0.2s, color 0.2s;
}

.btn-logout:hover {
  background: var(--color-surface-alt);
  color: var(--color-error);
}

/* 主聊天区 */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--color-bg);
}

.chat-header {
  padding: 12px 20px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.btn-menu {
  display: none;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 4px;
}

.chat-header-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.chat-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-text-light);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #52c41a;
  display: inline-block;
}

/* 消息区域 */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-behavior: smooth;
}

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

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

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

/* 欢迎消息 */
.welcome-message {
  display: flex;
  gap: 14px;
  max-width: 680px;
  margin: auto auto 20px;
  padding: 24px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.welcome-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  font-size: 20px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.welcome-content p {
  margin-bottom: 10px;
  color: var(--color-text);
  line-height: 1.7;
}

.welcome-content p:last-child {
  margin-bottom: 0;
}

.welcome-hint {
  color: var(--color-text-light) !important;
  font-size: 13px;
  margin-top: 14px !important;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

/* 消息气泡 */
.message {
  display: flex;
  gap: 10px;
  max-width: 75%;
  animation: fadeInUp 0.3s ease;
}

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

.message-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
}

.message.assistant .message-avatar {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
}

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

.message-bubble {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 15px;
  line-height: 1.7;
  word-break: break-word;
  white-space: pre-wrap;
  box-shadow: var(--shadow-sm);
}

.message.assistant .message-bubble {
  background: var(--color-surface);
  color: var(--color-text);
  border-top-left-radius: 4px;
}

.message.user .message-bubble {
  background: var(--color-user-bubble);
  color: #fff;
  border-top-right-radius: 4px;
}

.message-bubble.error {
  background: #FFF0F0 !important;
  color: var(--color-error) !important;
}

/* 消息内附件 */
.message-attachments {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 8px;
}

.message-attachments img {
  max-width: 240px;
  max-height: 200px;
  border-radius: 8px;
  object-fit: cover;
  display: block;
  box-shadow: var(--shadow-sm);
}

.message-file-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(107,144,128,0.1);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message.user .message-file-tag {
  background: rgba(255,255,255,0.2);
}

.message-text {
  white-space: pre-wrap;
  word-break: break-word;
}

/* 拖拽文件高亮 */
.messages-container.drag-over {
  outline: 2px dashed var(--color-primary);
  outline-offset: -8px;
  background: rgba(107,144,128,0.05);
}

.messages-container.drag-over::after {
  content: '松开即可上传文件';
  position: sticky;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  box-shadow: var(--shadow-md);
  z-index: 10;
  margin-top: auto;
  width: fit-content;
}

/* 打字指示器 */
.typing-indicator {
  display: none;
  align-self: flex-start;
  padding: 12px 18px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border-top-left-radius: 4px;
  box-shadow: var(--shadow-sm);
  gap: 5px;
  margin-left: 44px;
}

.typing-indicator.active {
  display: flex;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary-light);
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

/* 输入区域 */
.input-area {
  padding: 12px 20px 16px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

/* 文件预览区 */
.file-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 4px 10px;
  max-height: 120px;
  overflow-y: auto;
}

.file-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 8px 4px 4px;
  font-size: 12px;
  color: var(--color-text-secondary);
  max-width: 220px;
}

.file-chip img {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  object-fit: cover;
  flex-shrink: 0;
}

.file-chip-icon {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  background: rgba(107,144,128,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}

.file-chip-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.file-chip-tip {
  font-size: 10px;
  background: rgba(107,144,128,0.15);
  color: var(--color-primary);
  border-radius: 4px;
  padding: 1px 5px;
  flex-shrink: 0;
}

.file-chip-remove {
  border: none;
  background: transparent;
  color: var(--color-text-light);
  cursor: pointer;
  font-size: 14px;
  padding: 0 2px;
  line-height: 1;
  flex-shrink: 0;
}

.file-chip-remove:hover {
  color: var(--color-error);
}

/* 附件上传按钮 */
.btn-file {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s, color 0.2s;
}

.btn-file:hover {
  background: rgba(107,144,128,0.12);
  color: var(--color-primary);
}

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

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 8px 8px 8px 8px;
  border: 1.5px solid var(--color-border);
  transition: border-color 0.2s;
}

.input-wrapper:focus-within {
  border-color: var(--color-primary);
}

#messageInput {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  color: var(--color-text);
  outline: none;
  max-height: 120px;
  padding: 6px 0;
}

#messageInput::placeholder {
  color: var(--color-text-light);
}

.btn-send {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s, transform 0.1s, opacity 0.2s;
}

.btn-send:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

.btn-send:active:not(:disabled) {
  transform: scale(0.92);
}

.btn-send:disabled {
  background: var(--color-border);
  cursor: not-allowed;
}

.input-hint {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--color-text-light);
  margin-top: 6px;
  padding: 0 4px;
}

/* 遮罩 */
.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.3);
  z-index: 99;
}

.overlay.active {
  display: block;
}

/* 动画 */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
  30% { opacity: 1; transform: scale(1); }
}

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transform: translateX(-100%);
  }

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

  .btn-menu {
    display: flex;
  }

  .messages-container {
    padding: 16px 12px;
  }

  .message {
    max-width: 88%;
  }

  .welcome-message {
    padding: 18px;
    flex-direction: column;
    gap: 10px;
  }

  .input-area {
    padding: 10px 12px 14px;
  }

  .login-card {
    padding: 32px 24px;
  }
}

/* ====== 弹窗 ====== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.3s ease;
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 17px;
  font-weight: 600;
}

.modal-close {
  border: none;
  background: transparent;
  font-size: 24px;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-body {
  padding: 24px;
}

.modal-body p {
  color: var(--color-text);
  line-height: 1.7;
  font-size: 14px;
}

.modal-body ol {
  color: var(--color-text);
  font-size: 14px;
}

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

.modal-body a:hover {
  text-decoration: underline;
}

.modal-body select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-surface);
  outline: none;
  cursor: pointer;
}

.form-hint {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 6px;
  line-height: 1.5;
}

.api-status {
  font-size: 13px;
  margin-top: 8px;
  min-height: 18px;
}

.api-status.success {
  color: var(--color-primary);
}

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

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.btn-primary {
  padding: 10px 24px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-secondary {
  padding: 10px 24px;
  background: transparent;
  color: var(--color-text-secondary);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.2s;
}

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