:root {
    --bg-dark: #212121;
    --sidebar-bg: #171717;
    --text-main: #ececec;
    --accent-color: #10a37f; /* OpenAI 标志性绿色 */
    --input-bg: #2f2f2f;
    --border-color: #424242;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
}

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

/* 侧边栏样式 */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    padding: 15px;
}

.new-chat {
    background: transparent;
    border: 1px solid var(--border-color);
    color: white;
    padding: 10px;
    border-radius: 8px;
    text-align: left;
    cursor: pointer;
    transition: 0.3s;
}

.new-chat:hover { background: #2f2f2f; }

.history-list { flex-grow: 1; margin-top: 20px; }

.history-item {
    padding: 10px;
    border-radius: 5px;
    font-size: 14px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item.active { background: #2f2f2f; }

/* 主区域样式 */
.chat-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.top-nav {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    font-weight: bold;
    border-bottom: 1px solid var(--border-color);
}

.messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 40px 20%;
}

.message {
    margin-bottom: 30px;
    display: flex;
}

.message.user { justify-content: flex-end; }

.message .content {
    max-width: 80%;
    padding: 10px 15px;
    line-height: 1.6;
}

.message.user .content {
    background: var(--input-bg);
    border-radius: 15px;
}

/* 图片展示区域 */
.image-grid {
    margin-top: 15px;
    border-radius: 12px;
    overflow: hidden;
}

.gen-img {
    width: 100%;
    max-width: 512px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.image-actions {
    margin-top: 10px;
    display: flex;
    gap: 10px;
}

.image-actions button {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: #ccc;
    padding: 5px 12px;
    border-radius: 5px;
    cursor: pointer;
}

/* 输入框区域 */
.input-container {
    padding: 20px 20%;
    background: linear-gradient(transparent, var(--bg-dark) 20%);
}

.input-wrapper {
    background: var(--input-bg);
    border-radius: 15px;
    display: flex;
    align-items: center;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
}

.input-wrapper textarea {
    flex-grow: 1;
    background: transparent;
    border: none;
    color: white;
    outline: none;
    resize: none;
    padding: 5px 10px;
    font-size: 16px;
}

.send-btn {
    background: #fff;
    color: #000;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
}

.disclaimer {
    font-size: 12px;
    color: #888;
    text-align: center;
    margin-top: 10px;
}