/* 应用外壳与主要网格。全部响应式在这里定义。 */

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

.sidebar {
    padding: 20px 14px;
    background: var(--sidebar);
    color: var(--text);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    border-right: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 6px 18px;
    border-bottom: 1px solid var(--line);
}

.sidebar-brand .brand-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-strong);
    letter-spacing: -0.005em;
}

.brand-mark {
    width: 38px;
    height: 38px;
    border-radius: var(--radius);
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1px;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.28);
    flex-shrink: 0;
}

.brand-mark.lg {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    font-size: 22px;
    box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35);
}

.main-area {
    padding: 24px 28px 40px;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
}

.topbar-title {
    display: flex;
    flex-direction: column;
    flex: 1 1 240px;
    gap: 2px;
    min-width: 0;
}

.topbar-title h2 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
    color: var(--text-strong);
    letter-spacing: -0.01em;
}

.topbar-actions {
    display: flex;
    flex: 0 1 auto;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    flex-wrap: wrap;
    min-width: 0;
}

.server-monitor-topbar-switcher select {
    width: min(320px, 30vw);
    min-width: 190px;
    height: 34px;
    padding: 5px 32px 5px 10px;
    font-size: 12px;
}

.topbar-hamburger { display: none; }

.view-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    min-width: 0;
}

.page-grid {
    display: grid;
    grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
    gap: 16px;
}

.page-grid.assistant-grid {
    grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
}

.page-grid.migration-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-grid > * {
    min-width: 0;
}

/* 断点：1080 折叠侧栏；768 抽屉；480 更紧 padding */

@media (max-width: 1080px) {
    .app-shell {
        grid-template-columns: var(--sidebar-collapsed) minmax(0, 1fr);
    }
    .sidebar.is-compact .nav-item-label,
    .sidebar.is-compact .nav-group,
    .sidebar.is-compact .brand-title-block {
        display: none;
    }
    .sidebar.is-compact {
        padding: 20px 8px;
    }
    .sidebar.is-compact .nav-item {
        justify-content: center;
        padding: 10px 6px;
    }
    .sidebar.is-compact .sidebar-brand {
        justify-content: center;
    }
    .page-grid,
    .page-grid.assistant-grid,
    .page-grid.migration-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 768px) {
    .app-shell {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        width: var(--sidebar-width);
        height: 100vh;
        z-index: var(--z-drawer);
        transform: translateX(-100%);
        transition: transform 0.22s ease;
        box-shadow: var(--shadow-lg);
    }
    .sidebar.is-compact .nav-item-label,
    .sidebar.is-compact .nav-group,
    .sidebar.is-compact .brand-title-block {
        display: block;
    }
    .sidebar.is-compact .nav-item {
        justify-content: flex-start;
        padding: 9px 12px;
    }
    .sidebar.is-compact {
        padding: 20px 14px;
    }
    .sidebar.is-open {
        transform: translateX(0);
    }
    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(5, 6, 10, 0.55);
        z-index: calc(var(--z-drawer) - 1);
    }
    .topbar-hamburger {
        display: inline-flex;
    }
    .main-area {
        padding: 18px 16px 32px;
    }
    .topbar {
        flex-wrap: wrap;
    }
    .server-monitor-topbar-switcher {
        order: 2;
        width: 100%;
    }
    .server-monitor-topbar-switcher select {
        width: 100%;
    }
    .form-grid-2 {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 480px) {
    .main-area {
        padding: 14px 12px 28px;
    }
    .topbar-title h2 {
        font-size: 18px;
    }
}