/* ========== 全局样式 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-sidebar: #0f3460;
  --bg-input: #1a1a2e;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --bubble-user: #e94560;
  --bubble-ai: #2d2d44;
  --border-color: #333355;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

/* ========== 布局 ========== */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* ========== 侧边栏 ========== */
.sidebar {
  width: 300px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow-y: auto;
  transition: transform 0.3s ease;
  position: relative;
  z-index: 10;
}

.sidebar.collapsed {
  transform: translateX(-100%);
  position: absolute;
  height: 100%;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
  font-size: 18px;
  color: var(--accent);
}

.btn-close-sidebar {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}

.btn-close-sidebar:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.config-section {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.config-section h3 {
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.config-section label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  margin-top: 10px;
}

.config-section input {
  width: 100%;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

.config-section input:focus {
  border-color: var(--accent);
}

.config-section input::placeholder {
  color: #555;
}

.config-section select {
  width: 100%;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}

.config-section select:focus {
  border-color: var(--accent);
}

.preset-row input {
  margin-top: 6px;
}

.btn-save {
  width: 100%;
  margin-top: 14px;
  padding: 10px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-save:hover {
  background: var(--accent-hover);
}

/* 风格列表 */
.style-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.style-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  border: 2px solid transparent;
  background: var(--bg-primary);
  transition: all 0.2s;
}

.style-option:hover {
  border-color: var(--border-color);
}

.style-option.active {
  border-color: var(--accent);
  background: rgba(233, 69, 96, 0.1);
}

.style-option .style-icon {
  font-size: 22px;
  flex-shrink: 0;
}

.style-option .style-name {
  font-size: 14px;
  font-weight: 600;
}

.style-option .style-desc {
  font-size: 11px;
  color: var(--text-secondary);
}

.btn-clear {
  width: 100%;
  padding: 10px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-clear:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* 温馨提示 */
.tip-section p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  text-align: center;
}

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

/* 顶部栏 */
.chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.btn-menu {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 22px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background 0.2s;
}

.btn-menu:hover {
  background: rgba(255, 255, 255, 0.1);
}

.header-title h1 {
  font-size: 18px;
  color: var(--text-primary);
}

.header-subtitle {
  font-size: 12px;
  color: var(--accent);
}

/* 消息列表 */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.welcome-message {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.welcome-icon {
  font-size: 60px;
  margin-bottom: 16px;
}

.welcome-message h2 {
  font-size: 22px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.welcome-message p {
  margin-bottom: 6px;
}

.welcome-hint {
  margin-top: 16px;
  font-size: 13px;
  color: var(--accent);
}

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

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

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

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

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

.message.ai .message-avatar {
  background: #3d3d5c;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  line-height: 1.6;
  font-size: 15px;
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user .message-bubble {
  background: var(--bubble-user);
  border-bottom-right-radius: 4px;
}

.message.ai .message-bubble {
  background: var(--bubble-ai);
  border-bottom-left-radius: 4px;
}

.message-time {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 4px;
  padding: 0 4px;
}

.message.user .message-time {
  text-align: right;
}

/* 打字动画 */
.message.ai.typing .message-bubble {
  display: flex;
  gap: 4px;
  padding: 16px;
}

.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-secondary);
  animation: typingDot 1.4s infinite;
}

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

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

@keyframes typingDot {
  0%, 60%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  30% {
    opacity: 1;
    transform: scale(1.2);
  }
}

/* 输入区域 */
.chat-input-area {
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.input-hint {
  text-align: center;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.input-hint strong {
  color: var(--accent);
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.input-row textarea {
  flex: 1;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  resize: none;
  outline: none;
  max-height: 120px;
  transition: border-color 0.2s;
}

.input-row textarea:focus {
  border-color: var(--accent);
}

.input-row textarea::placeholder {
  color: #555;
}

.btn-send {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

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

.btn-send:active {
  transform: scale(0.95);
}

.btn-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ========== 页脚 ========== */
.chat-footer {
  padding: 20px 16px;
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.chat-footer p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.footer-icp a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-icp a:hover {
  color: var(--accent);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .sidebar {
    position: absolute;
    height: 100%;
    z-index: 20;
  }

  .sidebar.collapsed {
    transform: translateX(-100%);
  }

  .message {
    max-width: 90%;
  }

  .chat-messages {
    padding: 12px;
  }

  .chat-input-area {
    padding: 12px;
  }
}