/* ============================================
   SAP Transformation Platform — Mobile PWA
   Sprint 23: Progressive Web App Responsive Styles
   ============================================ */

/* ── PWA Install Banner ────────────────────────────────────────────────── */
.pwa-install-banner {
    position: fixed;
    bottom: -80px;
    left: 0;
    right: 0;
    background: var(--sidebar-bg, #1d2d3e);
    color: #fff;
    z-index: 1100;
    transition: bottom 0.35s ease;
    box-shadow: 0 -4px 20px rgba(0,0,0,.2);
}
.pwa-install-banner.visible {
    bottom: 0;
}
.pwa-install-banner__content {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    max-width: 600px;
    margin: 0 auto;
}
.pwa-install-banner__icon {
    font-size: 24px;
}
.pwa-install-banner__text {
    flex: 1;
    font-size: 14px;
}
.pwa-install-banner__btn {
    background: var(--pg-color-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 8px 20px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    white-space: nowrap;
}
.pwa-install-banner__close {
    background: none;
    border: none;
    color: rgba(255,255,255,0.6);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
}

/* ── Offline Indicator ─────────────────────────────────────────────────── */
.offline-indicator {
    position: fixed;
    top: -44px;
    left: 0;
    right: 0;
    background: var(--pg-color-warning);
    color: #fff;
    text-align: center;
    padding: 10px;
    font-size: 13px;
    font-weight: 600;
    z-index: 1200;
    transition: top 0.35s ease;
}
.offline-indicator.visible {
    top: 0;
}
body.is-offline .shell-header {
    top: 44px;
}
body.is-offline .sidebar {
    top: calc(var(--header-height, 48px) + 44px);
}
body.is-offline .main-content {
    margin-top: calc(var(--header-height, 48px) + 44px);
}

/* ── Hamburger Button ──────────────────────────────────────────────────── */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 22px;
    cursor: pointer;
    padding: 8px;
    margin-right: 4px;
    border-radius: 6px;
    transition: background 0.2s;
    line-height: 1;
    -webkit-tap-highlight-color: transparent;
}
.hamburger-btn:hover {
    background: rgba(255,255,255,0.1);
}

/* ── Sidebar Mobile Overlay ────────────────────────────────────────────── */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 89;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.sidebar-backdrop.visible {
    display: block;
    opacity: 1;
}

/* ── Bottom Tab Bar ────────────────────────────────────────────────────── */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--pg-color-surface);
    border-top: 1px solid var(--pg-color-border);
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom, 0);
}
.bottom-nav__items {
    display: flex;
    height: 56px;
    align-items: stretch;
}
.bottom-nav__item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    text-decoration: none;
    color: var(--pg-color-text-secondary);
    font-size: 10px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s;
    -webkit-tap-highlight-color: transparent;
    border: none;
    background: none;
    padding: 0;
}
.bottom-nav__item.active {
    color: var(--pg-color-primary);
}
.bottom-nav__item-icon {
    font-size: 20px;
    line-height: 1;
}
.bottom-nav__item-label {
    font-size: 10px;
    line-height: 1;
    white-space: nowrap;
}

/* ── Pull-to-Refresh Indicator ─────────────────────────────────────────── */
.pull-refresh {
    display: none;
    text-align: center;
    padding: 12px;
    color: var(--pg-color-text-secondary);
    font-size: 12px;
    font-weight: 600;
}
.pull-refresh.active {
    display: block;
}

/* ── Touch Utilities ───────────────────────────────────────────────────── */
.touch-target {
    min-height: 44px;
    min-width: 44px;
}

/* ═══════════════════════════════════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
   ═══════════════════════════════════════════════════════════════════════ */

/* ── Tablet (≤ 1024px) ─────────────────────────────────────────────────── */
@media (max-width: 1024px) {
    .scenario-grid, .card-grid {
        grid-template-columns: 1fr 1fr;
    }
    .cockpit-area-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ── Small Tablet / Large Phone (≤ 768px) ──────────────────────────────── */
@media (max-width: 768px) {
    /* Show hamburger */
    .hamburger-btn {
        display: flex;
        align-items: center;
    }

    /* Sidebar becomes slide-out drawer */
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width, 260px);
        z-index: 95;
        transition: transform 0.3s ease;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .sidebar.open + .sidebar-backdrop,
    .sidebar-backdrop.visible {
        display: block;
        opacity: 1;
    }

    /* Full-width main content */
    .main-content {
        margin-left: 0 !important;
        padding: 16px;
        padding-bottom: 80px; /* space for bottom nav */
    }

    /* Show bottom navigation */
    .bottom-nav {
        display: block;
    }

    /* Smaller header elements */
    .shell-header__logo span {
        display: none;
    }
    .shell-header__logo {
        font-size: 16px;
    }
    .shell-header__program-badge {
        max-width: 200px;
        padding: 5px 8px;
    }
    .shell-context-summary__program {
        font-size: 12px;
    }
    .shell-context-summary__project {
        font-size: 10.5px;
    }
    .shell-context-selector {
        position: fixed;
        top: calc(var(--pg-header-height, 48px) + 8px);
        left: 12px;
        right: 12px;
        width: auto;
        max-width: none;
    }

    /* Cards/grids go single-column */
    .scenario-grid,
    .cockpit-area-grid,
    .dashboard-grid,
    .detail-grid,
    .form-row,
    .card-grid {
        grid-template-columns: 1fr !important;
    }

    /* KPI row: 2 columns on tablet */
    .kpi-row {
        grid-template-columns: 1fr 1fr;
    }

    /* Page header stacks */
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .page-header h1 {
        font-size: 18px;
    }

    /* Tabs scrollable */
    .tabs, .exp-tabs, .ah-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .tabs::-webkit-scrollbar,
    .exp-tabs::-webkit-scrollbar,
    .ah-tabs::-webkit-scrollbar {
        display: none;
    }

    /* Buttons: touch-friendly */
    .btn {
        min-height: 40px;
        padding: 8px 16px;
        font-size: 13px;
    }

    /* Modal full-width */
    .modal {
        width: 95vw !important;
        max-width: 95vw !important;
        max-height: 85vh;
        margin: auto;
    }

    /* Table responsive */
    .data-table, table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* ── Phone (≤ 480px) ──────────────────────────────────────────────────── */
@media (max-width: 480px) {
    /* Stack KPIs single column */
    .kpi-row {
        grid-template-columns: 1fr !important;
    }
    .cockpit-kpi-grid {
        grid-template-columns: 1fr 1fr;
    }

    /* Reduce padding */
    .main-content {
        padding: 12px;
        padding-bottom: 80px;
    }
    .card {
        padding: 14px;
        margin-bottom: 12px;
    }

    /* Smaller typography */
    .page-header h1 {
        font-size: 16px;
    }
    .card-header h2 {
        font-size: 14px;
    }

    /* Tab sizing */
    .tab-btn, .exp-tab, .ah-tab {
        padding: 8px 12px;
        font-size: 11px;
    }

    /* Full-width buttons on small screens */
    .page-header .btn,
    .card-header .btn {
        width: 100%;
        justify-content: center;
    }

    /* Hide user label on very small screens */
    #userSwitcherLabel {
        display: none;
    }

    /* Compact shell header */
    .shell-header {
        padding: 0 10px;
    }
    .shell-header__program-badge {
        display: flex;
        max-width: 170px;
        padding: 5px 8px;
    }
    .shell-header__program-icon {
        width: 24px;
        height: 24px;
        font-size: 13px;
    }
    .shell-context-summary {
        gap: 4px;
    }
    .shell-context-summary__project::before {
        margin-right: 4px;
    }

    /* Modal: near-full-screen */
    .modal {
        width: 100vw !important;
        max-width: 100vw !important;
        max-height: 95vh;
        border-radius: 12px 12px 0 0;
    }
    .modal-overlay {
        align-items: flex-end;
    }

    /* Forms */
    .form-group label {
        font-size: 12px;
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* prevents iOS zoom */
        padding: 10px 12px;
    }

    /* AI panel compact */
    .ai-assistant-section {
        padding: 10px;
    }
    .ai-assistant-header {
        font-size: 12px;
    }
}

/* ── Safe Area (notch/island devices) ──────────────────────────────────── */
@supports (padding: env(safe-area-inset-top)) {
    .shell-header {
        padding-top: env(safe-area-inset-top);
    }
    .bottom-nav {
        padding-bottom: env(safe-area-inset-bottom);
    }
    .sidebar {
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* ── Touch Optimizations ───────────────────────────────────────────────── */
@media (pointer: coarse) {
    /* Larger tap targets for touch */
    .sidebar__item {
        padding: 14px 20px;
        min-height: 44px;
    }
    .btn {
        min-height: 44px;
    }
    .tab-btn, .exp-tab, .ah-tab {
        min-height: 44px;
    }
    .shell-header__icon-btn {
        padding: 10px;
        min-width: 44px;
        min-height: 44px;
    }

    /* Disable hover effects on touch */
    .btn:hover {
        transform: none;
        box-shadow: none;
    }
    .sidebar__item:hover {
        background: transparent;
    }
    .sidebar__item.active:hover {
        background: rgba(0, 112, 242, 0.15);
    }

    /* Active state for touch feedback */
    .btn:active {
        opacity: 0.8;
    }
    .sidebar__item:active {
        background: var(--sidebar-hover, #2c3e50);
    }
}

/* ── Standalone (installed PWA) ────────────────────────────────────────── */
@media (display-mode: standalone) {
    .pwa-install-banner {
        display: none !important;
    }
}

/* ── pg-* Component Responsive Rules (UI-S09-T05) ──────────────────────── */

/* Tablet (≤ 1200px) */
@media (max-width: 1200px) {
    .pg-dashboard-grid  { grid-template-columns: 1fr 1fr; }
    .pg-dash-kpis       { grid-template-columns: repeat(3, 1fr); }
}

/* Mobile (≤ 768px) */
@media (max-width: 768px) {
    /* pg-* dashboard */
    .pg-dashboard-grid  { grid-template-columns: 1fr; }
    .pg-dash-kpis       { grid-template-columns: repeat(2, 1fr); }

    /* pg-panel: full-width on mobile */
    .pg-panel           { width: 100% !important; }
    .has-panel          { margin-right: 0 !important; }

    /* pg-view-header stacks on small screens */
    .pg-view-header     { flex-direction: column; align-items: flex-start; gap: 4px; }

    /* pg-btn: touch-friendly */
    .pg-btn             { min-height: 40px; }

    /* Hide secondary table columns on mobile */
    .pg-table-col--secondary { display: none; }

    /* pg-steps: shrink text */
    .pg-steps__label    { font-size: 10px; }
}

/* Phone (≤ 480px) */
@media (max-width: 480px) {
    .pg-dash-kpis       { grid-template-columns: 1fr 1fr; }
    .pg-kpi-card        { padding: 12px; }
    .pg-kpi-card__value { font-size: 22px; }
}

/* Touch: disable hover lift animations */
@media (pointer: coarse) {
    .pg-btn:hover,
    .pg-kpi-card:hover,
    .pg-program-card:hover {
        transform: none;
        box-shadow: var(--pg-shadow-sm);
    }
}

/* ── Dark Mode Support (follows OS preference) ─────────────────────────── */
@media (prefers-color-scheme: dark) {
    :root {
        --sap-bg:             #1a1a2e;
        --sap-card-bg:        #242440;
        --sap-border:         #3a3a5c;
        --sap-text-primary:   #e0e0e0;
        --sap-text-secondary: #a0a0b0;
    }
    .bottom-nav {
        background: #242440;
        border-top-color: #3a3a5c;
    }
    .offline-indicator {
        background: #c55800;
    }
}

/* ── Reduced Motion ────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    .sidebar,
    .pwa-install-banner,
    .offline-indicator,
    .sidebar-backdrop,
    .main-content > * {
        transition: none !important;
        animation: none !important;
    }
}

/* ── Print Optimization ────────────────────────────────────────────────── */
@media print {
    .sidebar,
    .shell-header,
    .bottom-nav,
    .pwa-install-banner,
    .offline-indicator,
    .hamburger-btn,
    .sidebar-backdrop {
        display: none !important;
    }
    .main-content {
        margin-left: 0 !important;
        margin-top: 0 !important;
        padding: 0 !important;
    }
}