/* 主题变量 */
:root {
  /* 亮色主题默认值 */
  --bg-color: #ffffff;
  --text-color: #333333;
  --bg-secondary: #f8f9fa;
  --border-color: #e9ecef;

  /* 过渡效果 */
  --transition-duration: 0.3s;
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* 暗色主题变量 */
.dark {
  --bg-color: #0f0f1a;
  --text-color: #e0e0e0;
  --bg-secondary: #1a1a2e;
  --border-color: #2d2d42;
}

.dark img {
  opacity: 0.9;
}

.dark img:hover {
  opacity: 1;
}

/* 基础样式 */
html, body {
  min-height: 100%;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: 
    background-color var(--transition-duration) var(--transition-timing),
    color var(--transition-duration) var(--transition-timing);
}

.theme-transition *,
.theme-transition *::before,
.theme-transition *::after {
  transition:
    background-color var(--transition-duration) var(--transition-timing),
    border-color var(--transition-duration) var(--transition-timing),
    color var(--transition-duration) var(--transition-timing),
    box-shadow var(--transition-duration) var(--transition-timing);
}

.theme-transition {
  will-change: background-color, color, border-color, box-shadow;
  backface-visibility: hidden;
  transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
  -webkit-transform-style: preserve-3d;
}

/* 主题切换按钮样式 */
.theme-toggle {
  --base-scale: 120px;
  --toggle-width: 5.625em;
  --toggle-height: 2.5em;
  --radius-pill: 100em;
  --sun-diameter: 2.125em;
  --sun-offset: calc((var(--toggle-height) - var(--sun-diameter)) / 2);
  --bg-toggle-light: #3d7eae;
  --bg-toggle-dark: #1d1f2c;
  --color-sun: #ecca2f;
  --color-moon: #c4c9d1;
  --color-crater: #959db1;
  --color-star: #fff;
  --color-cloud-front: #f3fdff;
  --color-cloud-back: #aacadf;
  --shadow-primary: rgba(0, 0, 0, 0.25);
  --shadow-highlight: rgba(255, 255, 255, 0.94);
  --halo-color: rgba(255, 255, 255, 0.1);
  --transition-standard: 0.3s ease;
  
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 100;
  margin-left: 1rem;
  width: var(--toggle-width);
  height: var(--toggle-height);
}

.theme-toggle__container {
  width: 100%;
  height: 100%;
  background-color: var(--bg-toggle-light);
  border-radius: var(--radius-pill);
  position: relative;
  transition: background-color var(--transition-standard);
  overflow: hidden;
  box-shadow: 0.06em 0.06em 0.125em var(--shadow-highlight);
}

.dark .theme-toggle__container {
  background-color: var(--bg-toggle-dark);
}

.theme-toggle__container::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.5) inset;
  border-radius: var(--radius-pill);
  pointer-events: none;
}

.theme-toggle__sun {
  width: var(--sun-diameter);
  height: var(--sun-diameter);
  background-color: var(--color-sun);
  border-radius: 50%;
  position: absolute;
  top: var(--sun-offset);
  transform: translateX(var(--sun-offset));
  box-shadow: 0.05em 0.125em 0.125em var(--shadow-primary),
    0em 0.05em 0.125em var(--shadow-primary),
    0.05em 0.05em 0.05em 0em rgba(254, 255, 239, 0.61) inset,
    0em -0.05em 0.05em 0em #a1872a inset, 0 0 0 0.625em var(--halo-color),
    0 0 0 1.25em var(--halo-color), 0 0 0 1.875em var(--halo-color);
  transition: transform var(--transition-standard);
  overflow: hidden;
}

.dark .theme-toggle__container .theme-toggle__sun {
  transform: translateX(
    calc(var(--toggle-width) - var(--sun-diameter) - var(--sun-offset))
  );
}

.theme-toggle__moon-mask {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: var(--color-moon);
  border-radius: inherit;
  transform: translateX(100%);
  transition: transform var(--transition-standard);
  box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset,
    0em -0.062em 0.062em 0em #969696 inset;
}

.dark .theme-toggle__container .theme-toggle__moon-mask {
  transform: translateX(0);
}

.theme-toggle__crater {
  position: absolute;
  background-color: var(--color-crater);
  border-radius: 50%;
  box-shadow: 0em 0.03em 0.06em var(--shadow-primary) inset;
}

.theme-toggle__crater:nth-of-type(1) {
  top: 0.75em;
  left: 0.3em;
  width: 0.75em;
  height: 0.75em;
}

.theme-toggle__crater:nth-of-type(2) {
  top: 0.9em;
  left: 1.375em;
  width: 0.375em;
  height: 0.375em;
}

.theme-toggle__crater:nth-of-type(3) {
  top: 0.3em;
  left: 0.8em;
  width: 0.25em;
  height: 0.25em;
}

.theme-toggle__stars {
  position: absolute;
  left: 0.3em;
  transform: translateY(-2em);
  transition: transform var(--transition-standard);
  width: 2.75em;
  color: var(--color-star);
}

.dark .theme-toggle__container .theme-toggle__stars {
  transform: translateY(0.5em);
}

.theme-toggle__clouds {
  position: absolute;
  left: 0.3em;
  top: 2em;
  transform: translateY(0);
  width: 1.25em;
  height: 1.25em;
  background-color: var(--color-cloud-front);
  border-radius: 50%;
  box-shadow: 0.937em 0.312em var(--color-cloud-front),
    1.437em 0.375em var(--color-cloud-front), 2.187em 0 var(--color-cloud-front),
    2.937em 0.312em var(--color-cloud-front),
    3.625em -0.062em var(--color-cloud-front),
    4.5em -0.312em var(--color-cloud-front),
    4.625em -1.75em 0 0.437em var(--color-cloud-front),
    -0.312em -0.312em var(--color-cloud-back),
    0.5em -0.125em var(--color-cloud-back),
    1.25em -0.062em var(--color-cloud-back),
    2em -0.312em var(--color-cloud-back), 2.625em 0em var(--color-cloud-back),
    3.375em -0.437em var(--color-cloud-back),
    4em -0.625em var(--color-cloud-back),
    4.125em -2.125em 0 0.437em var(--color-cloud-back);
  transition: transform var(--transition-standard);
}

.dark .theme-toggle__container .theme-toggle__clouds {
  transform: translateY(3em);
}

.theme-toggle__container:hover .theme-toggle__sun {
  transform: translateX(calc(var(--sun-offset) + 0.187em));
}

.dark .theme-toggle__container:hover .theme-toggle__sun {
  transform: translateX(
    calc(
      var(--toggle-width) - var(--sun-diameter) - var(--sun-offset) - 0.187em
    )
  );
}

/* 侧边栏样式 */
.sidebar {
  width: 260px;
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  background-color: #f8f9fa;
  border-right: 1px solid #e9ecef;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: all 0.3s ease;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 16px;
  padding: 10px 16px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.new-chat-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.new-chat-btn svg {
  width: 16px;
  height: 16px;
}

.conversations-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 16px;
}

.conversation-item {
  padding: 10px 12px;
  margin: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s;
  font-size: 14px;
  color: #333;
  background-color: white;
  border: 1px solid #e9ecef;
}

.conversation-item:hover {
  background-color: #f1f3f5;
}

.conversation-item.active {
  background-color: #e9ecef;
  font-weight: 500;
  border-color: #ced4da;
}

.conversation-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-right: 8px;
}

.delete-conversation {
  background: none;
  border: none;
  color: #868e96;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 0 4px;
  border-radius: 4px;
  opacity: 0;
  transition: all 0.2s;
}

.conversation-item:hover .delete-conversation {
  opacity: 1;
}

.delete-conversation:hover {
  color: #fa5252;
  background-color: #fff5f5;
}

/* 主内容区域 */
.main-content {
  margin-left: 260px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 暗色主题样式 */
.dark .sidebar {
  --primary-color: #ff8ab4;
  --primary-hover: #ff6b9c;
  --light-bg: #1a1a2e;
  --border-color: #2d2d42;
  --text-color: #e0e0e0;
  --text-light: #b8b8b8;
  --user-msg-bg: #2d2d42;
  --assistant-msg-bg: #1a1a2e;
  --header-bg: linear-gradient(135deg, #2d2d42 0%, #1a1a2e 100%);
  background-color: #0f0f1a;
  background-color: #1a1a2e;
  border-right-color: #2d2d42;
  color: #e0e0e0;
}

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

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

.dark .conversation-item {
  background-color: #2d2d42;
  border-color: #3e3e5e;
  color: #e0e0e0;
}

.dark .conversation-item:hover {
  background-color: #3a3a5a;
}

.dark .conversation-item.active {
  background-color: #3a3a5a;
  border-color: #4d4d7a;
}

.dark .delete-conversation {
  color: #868e96;
}

.dark .delete-conversation:hover {
  color: #ff6b6b;
  background-color: #3a3a5a;
}

/* 暗色主题下的消息样式 */
.chat-container {
  background-color: var(--bg-color);
}

.shell {
  background-color: var(--bg-color);
}

.message {
  background-color: var(--bg-secondary);
  color: var(--text-color);
}

.message.user {
  background-color: var(--bg-secondary);
  color: var(--text-color);
}

.message-input-container {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

#user-input {
  background-color: var(--bg-secondary);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.dark #user-input::placeholder {
  color: #8a8a8a;
}

.dark .toolbar {
  background-color: #1a1a2e;
  transition: background-color 0.3s ease;
  border-bottom: 1px solid var(--border-color);
}

.dark .home-btn {
  background-color: #2d2d42;
  border-color: var(--border-color);
  color: #e0e0e0;
}

.dark .home-btn:hover {
  background-color: #3d3d5a;
}

.dark .lang-btn {
  background-color: #2d2d42;
  color: #e0e0e0;
  border-color: var(--border-color);
}

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

.dark .lang-btn:hover:not(.active) {
  background-color: #3d3d5a;
}

.dark .clear-btn {
  background-color: #2d2d42;
  color: #e0e0e0;
  border-color: var(--border-color);
}

.dark .clear-btn:hover {
  background-color: #3d3d5a;
}

.dark .typing-indicator {
  color: #b8b8b8;
}

.dark .shell {
  background: #131324;
}

.dark .message.user {
  background-color: var(--user-msg-bg);
  border: 1px solid var(--border-color);
}

.dark .message.assistant {
  background-color: var(--assistant-msg-bg);
  border: 1px solid var(--border-color);
}

.dark header {
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
}

.dark .input-area {
  border-top: 1px solid var(--border-color);
  background: var(--assistant-msg-bg);
}

.dark input[type="text"] {
  background-color: #2d2d42;
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.dark button {
  background-color: var(--primary-color);
  color: #fff;
}

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

.dark .typing-indicator span {
  background-color: var(--text-light);
}