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

:root {
    --primary: #4f46e5;
    --primary-light: #eef2ff;
    --bg: #f5f5f5;
    --white: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

/* ========== 聊天容器 ========== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 720px;
    margin: 0 auto;
    background: var(--bg);
}

/* ========== 顶部栏 ========== */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    flex-shrink: 0;
}

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

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

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

.header-status {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    display: inline-block;
}

.clear-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

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

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

.messages::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 3px;
}

/* ========== 消息气泡 ========== */
.message {
    display: flex;
    max-width: 85%;
}

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

.message-content {
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.6;
    word-break: break-word;
}

.message.bot .message-content {
    background: var(--white);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow);
}

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

/* 打字光标 */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 16px;
    background: var(--primary);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: blink 0.8s infinite;
}

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

/* 加载动画 */
.loading-dots {
    display: flex;
    gap: 4px;
    padding: 4px 0;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: bounce 1.4s infinite ease-in-out;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

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

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 8px 8px 8px 16px;
    transition: border-color 0.2s;
}

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

#input {
    flex: 1;
    border: none;
    background: none;
    outline: none;
    resize: none;
    font-size: 14px;
    line-height: 1.5;
    font-family: inherit;
    color: var(--text);
    max-height: 120px;
}

#input::placeholder {
    color: #9ca3af;
}

.send-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
}

.send-btn:hover {
    background: #4338ca;
}

.send-btn:disabled {
    background: #c7d2fe;
    cursor: not-allowed;
}

.input-hint {
    font-size: 11px;
    color: #9ca3af;
    text-align: right;
    margin-top: 6px;
    padding-right: 4px;
}

/* ========== 移动端适配 ========== */
@media (max-width: 640px) {
    .chat-header {
        padding: 10px 14px;
    }

    .messages {
        padding: 16px 12px;
    }

    .message {
        max-width: 90%;
    }

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

    .input-hint {
        display: none;
    }
}