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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #151a36;
    --bg-tertiary: #1e2544;
    --text-primary: #ffffff;
    --text-secondary: #b8bcc8;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --border-color: #2d3451;
    --success-color: #10b981;
    --error-color: #ef4444;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 顶部标题栏 */
.top-header {
    width: 100%;
    height: 60px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    flex-shrink: 0;
    position: relative;
    z-index: 100;
}

.top-left {
    width: 220px;
    display: flex;
    align-items: center;
    padding-left: var(--spacing-lg);
    flex-shrink: 0;
}

.top-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-right: var(--spacing-lg);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-logo {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.site-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.main-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    text-align: center;
    width: 100%;
}

.user-info {
    font-size: 14px;
    color: var(--text-secondary);
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
}

/* 主容器 */
.main-container {
    flex: 1;
    display: flex;
    overflow: hidden;
    margin-bottom: 70px; /* 为迷你播放器留出空间 */
    margin-left: 220px; /* 为固定侧边栏留出空间 */
}

/* 侧边栏 */
.sidebar {
    position: fixed;
    top: 60px; /* 顶部标题栏高度 */
    left: 0;
    bottom: 0;
    width: 220px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 50;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 按钮通用样式 */
button {
    cursor: pointer;
    border: none;
    background: none;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.2s;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 6px;
    font-weight: 500;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 6px;
    font-weight: 500;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-danger {
    background: var(--error-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 6px;
    font-weight: 500;
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-warning {
    background: #f59e0b;
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 6px;
    font-weight: 500;
}

.btn-warning:hover:not(:disabled) {
    background: #d97706;
}

/* 输入框通用样式 */
input[type="text"],
input[type="password"],
input[type="number"] {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* 欢迎消息 */
.welcome-message {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 500px;
    margin: auto;
}

.welcome-message h1 {
    font-size: 28px;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.welcome-message p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 16px;
}