/* 百度网盘充值系统 - 侧边栏布局 (美化版) */

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-w);
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.12);
}

/* Logo 区域 */
.sidebar-logo {
    padding: 28px 24px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    position: relative;
}

.sidebar-logo::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 24px;
    right: 24px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(13, 148, 136, 0.3), transparent);
}

.sidebar-logo svg {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    color: var(--primary);
    filter: drop-shadow(0 0 8px rgba(13, 148, 136, 0.4));
}

.sidebar-logo span {
    font-size: 18px;
    font-weight: 700;
    white-space: nowrap;
    background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
}

/* 导航区域 */
.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: rgba(255, 255, 255, 0.3);
    padding: 8px 12px 8px;
    margin-top: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    margin-bottom: 2px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all var(--transition);
    border-radius: var(--radius-sm);
    position: relative;
    letter-spacing: 0.2px;
}

.nav-item:hover {
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.06);
}

.nav-item.active {
    color: #fff;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.2) 0%, rgba(13, 148, 136, 0.1) 100%);
    box-shadow: inset 0 0 0 1px rgba(13, 148, 136, 0.15);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--primary);
    border-radius: 0 3px 3px 0;
    box-shadow: 0 0 12px rgba(13, 148, 136, 0.5);
}

.nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
    transition: opacity var(--transition);
}

.nav-item:hover svg { opacity: 1; }
.nav-item.active svg { opacity: 1; color: var(--primary); }

/* 底部用户区 */
.sidebar-footer {
    padding: 20px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    position: relative;
}

.sidebar-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 24px;
    right: 24px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(13, 148, 136, 0.2), transparent);
}

.sidebar-user {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-user strong {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
}

.btn-logout {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    padding: 10px 0;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.3px;
}

.btn-logout:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* 主内容区 */
.main-content {
    margin-left: var(--sidebar-w);
    flex: 1;
    padding: 36px 40px;
    min-height: 100vh;
    background: var(--bg);
    position: relative;
}

/* 页面背景装饰 */
.main-content::before {
    content: '';
    position: fixed;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(13, 148, 136, 0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

.main-content > * {
    position: relative;
    z-index: 1;
}

.page-title {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 28px;
    color: var(--text);
    letter-spacing: -0.5px;
    animation: fadeInDown 0.4s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

.page-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--border), transparent);
    margin-left: 16px;
}