* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --w-primary: #066fc0;
    --w-primary-rgb: 6, 111, 192;
    --w-gradient-end: #0666bb;
    --w-deep-text: #14517a;
    --w-caption-text: #2174ab;
    --w-soft-bg: #f3f9fe;
    --w-border-soft: #bbdcf2;
    --bg: #f5f5f5;
    --chat-bg: #ffffff;
    --ai-bubble: #f0f0f0;
    --text: #333333;
    --text-light: #666666;
    --text-white: #ffffff;
    --border: #e0e0e0;
    --success: #34a853;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 800px;
    margin: 0 auto;
    background: var(--chat-bg);
    box-shadow: var(--shadow);
}

/* Header */
.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--w-primary);
    color: white;
    flex-shrink: 0;
}

.chat-header .avatar {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    position: relative;
}

/* 头像通用:emoji 兜底层 + 品牌图片层 */
.avatar-emoji { line-height: 1; }
.avatar-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; border-radius: 50%; }

/* 在线状态点 */
.chat-header .avatar::after {
    content: '';
    position: absolute;
    bottom: 1px;
    right: 1px;
    width: 14px;
    height: 14px;
    background: #22c55e;
    border-radius: 50%;
    border: 3px solid var(--w-primary);
}

.chat-header .info h1 {
    font-size: 17px;
    font-weight: 600;
    margin: 0;
}

.chat-header .info .status {
    font-size: 13px;
    opacity: 0.95;
    margin: 0;
}

/* 头部操作按钮 */
.chat-header .actions {
    display: flex;
    gap: 8px;
}

.chat-header .action-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.25);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    transition: background 0.2s;
    color: #fff;
}

.chat-header .action-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* Messages area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    padding-bottom: 8px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message {
    display: flex;
    max-width: 80%;
}

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

.message.assistant {
    align-self: flex-start;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.message .bubble {
    padding: 10px 16px;
    border-radius: 16px;
    line-height: 1.5;
    font-size: 14px;
    word-break: break-word;
}

.message.user .bubble {
    background: var(--w-primary);
    color: var(--text-white);
    border-bottom-right-radius: 4px;
}

.message.assistant .avatar {
    width: 32px;
    height: 32px;
    background: var(--w-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(var(--w-primary-rgb),0.3);
}

.message.assistant .bubble {
    background: #f3f4f6;
    color: #1f2937;
    padding: 12px 16px;
    border-bottom-left-radius: 4px;
    max-width: 280px;
}

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

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

/* Typing indicator */
.typing-indicator {
    display: none;
    align-self: flex-start;
    padding: 10px 16px;
    background: var(--ai-bubble);
    border-radius: 16px;
    border-bottom-left-radius: 4px;
}

.typing-indicator.active {
    display: flex;
    gap: 4px;
    align-items: center;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #999;
    border-radius: 50%;
    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; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* 消息区分隔线 */
.chat-separator {
  height: 1px;
  background: var(--w-primary);
  opacity: 0.3;
  flex-shrink: 0;
}

/* 输入区域容器 */
.chat-input-container {
  padding: 10px 10px;
  background: white;
  flex-shrink: 0;
}

/* 输入容器 */
.input-wrapper {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 8px 16px;
  background: var(--w-soft-bg);  /* 主题浅底 */
  border-radius: 28px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* 输入框 */
.chat-input-container input {
  flex: 1;
  padding: 0;
  border: none;
  font-size: 14px;
  background: transparent;
  outline: none;
  min-height: 20px;
  color: #1f2937;
}

.chat-input-container input:focus {
  box-shadow: inset 0 0 0 2px rgba(var(--w-primary-rgb),0.2);
}

.chat-input-container input::placeholder {
  color: #9ca3af;
}

/* 分隔线 */
.input-separator {
  width: 1px;
  height: 24px;
  background: #e5e7eb;
  margin: 0 8px;
  flex-shrink: 0;
}

/* 发送按钮 */
.send-btn {
  padding: 8px 16px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--w-primary), var(--w-gradient-end));
  color: white;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(var(--w-primary-rgb),0.25);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.send-btn:hover {
  box-shadow: 0 4px 12px rgba(var(--w-primary-rgb),0.35);
}

.send-btn .send-icon {
  font-size: 16px;
}

.send-btn .send-text {
  font-size: 14px;
}

.send-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
  box-shadow: none;
}

/* Ended banner */
.chat-ended {
    display: none;
    text-align: center;
    padding: 12px;
    background: #e8f5e9;
    color: var(--success);
    font-size: 13px;
    font-weight: 500;
}

.chat-ended.active {
    display: block;
}

/* Help 区块 */
.help-block {
  background: var(--w-soft-bg);
  border-radius: 12px;
  padding: 10px 14px;
  margin-bottom: 16px;
  border: 1px solid var(--w-border-soft);
}
.panel-top {
    flex-shrink: 0;
    padding: 10px 16px;
    background: var(--w-soft-bg);
}
.help-block .help-content {
  flex: 1;
  min-width: 0;
}

.help-block .help-title {
  font-size: 16px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 3px;
}

.help-block .help-description {
  font-size: 12px;
  color: #6b7280;
  line-height: 1.4;
}

.help-block .help-actions {
  display: grid;
  gap: 8px;
  flex-shrink: 0;
}

.help-block .call-btn {
  background: #fff;
  color: var(--w-deep-text);
  border: 1px solid var(--w-border-soft);
  padding: 6px 10px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  text-decoration: none;
  flex-shrink: 0;
  transition: all 0.2s;
}

.help-block .call-btn:hover {
  background: var(--w-soft-bg);
  transform: translateY(-1px);
}

.help-block .call-btn svg {
  flex-shrink: 0;
}

/* POPULAR TOPICS 区块 */
.popular-topics-fixed {
  flex-shrink: 0;
  padding: 12px 20px 8px;
  background: white;
}

.chat-separator-topics {
  height: 1px;
  background: var(--w-primary);
  opacity: 0.15;
  flex-shrink: 0;
}

.popular-topics-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--w-caption-text);
  letter-spacing: 0.14em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.popular-topics-grid {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.popular-topic-btn {
  border-radius: 20px;
  border: 1px solid var(--w-border-soft);
  background: var(--w-soft-bg);
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--w-deep-text);
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.popular-topic-btn:hover {
  background: white;
}

/* 底部信息栏 */
.chat-footer {
  padding: 10px 10px;
  background: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--w-caption-text);
  gap: 20px;
}

.chat-footer .footer-left {
  flex: 1;
}

.chat-footer .footer-right {
  flex-shrink: 0;
}

.chat-footer a {
  color: var(--w-caption-text);
  text-decoration: underline;
}

/* Mobile */
@media (max-width: 600px) {
    .chat-container {
        max-width: 100%;
    }
    .message {
        max-width: 88%;
    }
}