/* ==========================================
   整体布局 — flex 三栏结构
   ========================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}
body {
    margin: 0;
    font-family: var(--font-family);
    background: var(--bg-main);
    color: var(--text-normal);
    overflow: hidden;
    display: flex;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

.app-layout {
    display: flex;
    width: 100%;
    height: 100%;
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-main);
    min-width: 0;
}

/* 顶栏 */
.top-bar {
    height: 48px;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    border-bottom: 1px solid rgba(0,0,0,0.2);
    box-shadow: var(--shadow-bar);
    flex-shrink: 0;
    flex-wrap: wrap;
    overflow: hidden;
}

.top-bar .divider {
    width: 1px;
    height: 24px;
    background: rgba(255,255,255,0.2);
    margin: 0 var(--space-sm);
}

.top-bar input[type="text"] {
    background: var(--bg-chat-input);
    border: none;
    color: var(--text-white);
    padding: 6px var(--space-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-md);
    outline: none;
    width: 220px;
}

.top-bar .spacer {
    flex: 1;
}

/* 内容体 */
.content-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-lg);
    overflow: hidden;
    min-height: 0;
}