/* T-Apuri — Layout (3-Zone Shell: Sidebar + Workspace + Context Panel) */
/* Session 7.1 — Mobile-first responsive */

/* ============================================
   1. LOGIN VIEW
   ============================================ */

.login-view {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    background-color: var(--surface-background);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: var(--space-6);
}

.login-logo {
    text-align: center;
    margin-bottom: var(--space-8);
}

.login-logo h1 {
    color: var(--color-primary-600);
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-2);
}

.login-logo p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   2. APP SHELL — Mobile-first (< 640px)
   ============================================
   Mobiilissa: yksi sarake, sidebar piilossa
*/

.app-shell {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
}

/* ============================================
   3. SIDEBAR — Mobile: off-canvas overlay
   ============================================ */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--surface-sidebar);
    border-right: 1px solid var(--border-default);
    overflow-y: auto;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
}

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

/* Sidebar overlay/backdrop (mobiili) */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 0.4);
    z-index: 40;
}

/* ============================================
   4. WORKSPACE — Mobile: full width
   ============================================ */

.workspace {
    grid-column: 1;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;          /* flex/grid child overflow fix */
    overflow: hidden;       /* header kiinteä, view-content scrollaa */
}

.workspace-header {
    flex-shrink: 0;
    height: var(--header-height);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0 var(--space-4);
    background: var(--surface-card);
    border-bottom: 1px solid var(--border-default);
    z-index: 10;
}

.workspace-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.workspace-actions {
    margin-left: auto;
}

.view-content {
    flex: 1;
    min-height: 0;          /* flex child overflow fix */
    overflow-y: auto;       /* sisältöalue scrollaa */
    padding: var(--space-4);
}

/* ============================================
   5. CONTEXT PANEL — Mobile: full-screen overlay
   ============================================ */

.context-panel {
    position: fixed;
    inset: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    background: var(--surface-panel);
    z-index: 50;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
}

.context-panel.is-visible {
    transform: translateX(0);
}

.context-panel-header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-4);
    border-bottom: 1px solid var(--border-default);
    background: var(--surface-panel);
    z-index: 5;
}

.context-panel-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: var(--space-4);
}

.context-panel-content {
    flex: 1;
    padding: var(--space-4);
    overflow-y: auto;
}

/* Resize handle: oletuksena piilossa (näkyy vain desktopilla) */
.context-resize-handle {
    display: none;
}

/* ============================================
   6. MOBILE MENU BUTTON (näkyy vain mobiilissa)
   ============================================ */

.mobile-menu-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    transition: background var(--transition-fast);
}

.mobile-menu-button:hover {
    background: var(--color-neutral-100);
}

/* ============================================
   7. TABLET (640px — 1023px)
   ============================================
   Sidebar collapsed (icon-only), context panel slide-in overlay
*/

@media (min-width: 640px) {
    .app-shell {
        grid-template-columns: var(--sidebar-width-collapsed) 1fr;
    }

    .sidebar {
        position: sticky;
        top: 0;
        width: var(--sidebar-width-collapsed);
        transform: none;
        z-index: 30;
    }

    .sidebar .nav-label {
        display: none;
    }

    .sidebar-logo {
        display: none;
    }

    .sidebar-logo-icon {
        display: block;
    }

    .sidebar-header {
        justify-content: center;
    }

    .sidebar-toggle {
        display: none;
    }

    .sidebar-overlay {
        display: none !important;
    }

    .mobile-menu-button {
        display: none;
    }

    .workspace {
        grid-column: 2;
    }

    .workspace-header {
        padding: 0 var(--space-6);
    }

    .view-content {
        padding: var(--space-6);
    }

    /* Context panel: slide-in overlay oikealta */
    .context-panel {
        position: fixed;
        inset: auto 0 0 auto;
        width: min(var(--context-panel-width), 85vw);
        height: 100vh;
        height: 100dvh;
        box-shadow: var(--shadow-lg);
        z-index: 40;
    }
}

/* ============================================
   8. DESKTOP (1024px+)
   ============================================
   Sidebar täysi, context panel pushaa workspacea
*/

@media (min-width: 1024px) {
    .app-shell {
        grid-template-columns: var(--sidebar-width) 1fr;
    }

    .app-shell.context-open {
        grid-template-columns: var(--sidebar-width) 1fr var(--context-panel-width);
    }

    .sidebar {
        width: var(--sidebar-width);
    }

    .sidebar .nav-label {
        display: inline;
    }

    .sidebar-logo {
        display: block;
    }

    .sidebar-logo-icon {
        display: none;
    }

    /* Context panel: grid-sarake, ei overlay */
    .context-panel {
        position: relative;
        top: auto;
        inset: auto;
        grid-column: 3;
        grid-row: 1;
        width: auto;
        height: auto;
        border-left: 1px solid var(--border-default);
        box-shadow: none;
        z-index: 1;
        transform: none;
        overflow-y: auto;
    }

    .context-panel.is-visible {
        transform: none;
    }

    .context-panel-header {
        padding: 0 var(--space-6);
    }

    .context-panel-content {
        padding: var(--space-6);
    }

    /* Resize handle: raahattava kahva context panelin vasemmassa reunassa */
    .context-resize-handle {
        display: block;
        position: absolute;
        top: 0;
        left: 0;
        width: 5px;
        height: 100%;
        cursor: col-resize;
        z-index: 2;
        background: transparent;
        transition: background var(--transition-fast);
    }

    .context-resize-handle:hover,
    .context-resize-handle.is-dragging {
        background: var(--color-primary-400);
    }
}

/* ============================================
   9. VIEW PLACEHOLDER
   ============================================ */

.view-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    text-align: center;
    color: var(--text-muted);
}

.view-placeholder h3 {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.view-placeholder p {
    font-size: var(--font-size-sm);
}