.cos-app {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

.cos-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.cos-page {
    width: 100%;
    max-width: 100%;
    min-width: 0;
}

.cos-page.cos-app-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.cos-page.cos-app-layout .cos-content-zone {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
}

.cos-page.cos-app-layout .cos-app-shell {
    flex: 1 1 auto;
    min-height: 0;
}

.cos-container {
    width: 100%;
    max-width: 1280px;
    margin-right: auto;
    margin-left: auto;
    padding-right: var(--cos-space-4);
    padding-left: var(--cos-space-4);
}

.cos-header-zone,
.cos-topbar-zone,
.cos-content-zone,
.cos-footer-zone {
    min-width: 0;
    max-width: 100%;
}

.cos-content-zone {
    flex: 1 1 auto;
}

.cos-layout-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--cos-space-4);
    min-width: 0;
}

.cos-layout-col {
    flex: 1 1 0;
    min-width: 0;
    max-width: 100%;
}

.cos-panel {
    background: var(--cos-color-surface);
    border: 1px solid var(--cos-color-border);
    border-radius: var(--cos-radius-md);
    box-shadow: var(--cos-shadow-sm);
}

.cos-app-shell {
    display: flex;
    align-items: stretch;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    min-height: 100vh;
    overflow: hidden;
    background: var(--cos-color-bg);
}

.cos-app-sidebar {
    flex: 0 0 280px;
    width: 280px;
    max-width: 280px;
    min-width: 0;
    overflow-x: hidden;
    overflow-y: auto;
    background: var(--cos-color-surface);
    border-right: 1px solid var(--cos-color-border);
}

.cos-app-main {
    flex: 1 1 auto;
    width: auto;
    min-width: 0;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.cos-app-topbar {
    position: sticky;
    top: 0;
    z-index: var(--cos-z-topbar);
    display: flex;
    align-items: center;
    gap: var(--cos-space-2);
    width: 100%;
    min-width: 0;
    max-width: 100%;
    padding: var(--cos-space-3) var(--cos-space-4);
    background: var(--cos-color-surface);
    border-bottom: 1px solid var(--cos-color-border);
}

.cos-app-workspace {
    flex: 1 1 auto;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    padding: var(--cos-space-4);
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    background: var(--cos-color-surface-muted);
}

.cos-app-content {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.cos-sidebar-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--cos-color-border);
    border-radius: var(--cos-radius-sm);
    background: var(--cos-color-surface);
    color: var(--cos-color-text);
    cursor: pointer;
    flex: 0 0 auto;
}

.is-sidebar-open .cos-app-sidebar {
    transform: translateX(0);
}

body.is-sidebar-open {
    overflow: hidden;
    touch-action: none;
}

@media (max-width: 991.98px) {
    .cos-app-shell {
        position: relative;
        min-height: auto;
    }

    .cos-app-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: min(86vw, 320px);
        max-width: min(86vw, 320px);
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        z-index: var(--cos-z-overlay);
        box-shadow: var(--cos-shadow-md);
        padding: var(--cos-space-3);
    }

    .cos-app-main {
        width: 100%;
    }

    .cos-sidebar-toggle {
        display: inline-flex;
    }

    .is-sidebar-open::after {
        content: "";
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background: rgba(15, 23, 42, 0.35);
        z-index: calc(var(--cos-z-overlay) - 1);
    }
}

@media (min-width: 992px) {
    .cos-app-sidebar {
        padding: var(--cos-space-4) var(--cos-space-3);
    }
}

@media (max-width: 767.98px) {
    .cos-container {
        padding-right: var(--cos-space-3);
        padding-left: var(--cos-space-3);
    }

    .cos-layout-row {
        gap: var(--cos-space-3);
    }

    .cos-app-topbar,
    .cos-app-workspace {
        padding: var(--cos-space-3);
    }
}