/* ══════════════════════════════════════════════════════════════════
   MOBILE / RESPONSIVE LAYOUT
══════════════════════════════════════════════════════════════════ */

/* ── Hamburger toggle button (hidden on desktop) ── */
.sidebar-toggle-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-speed);
    flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
    background-color: rgba(255, 255, 255, 0.06);
}

.sidebar-toggle-btn i {
    width: 22px;
    height: 22px;
}

/* ── Mobile sidebar backdrop overlay ── */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(2px);
    z-index: 199;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sidebar-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
}

/* ══════════════════════════════════════════════════════
   BREAKPOINT: TABLET  ≤ 1100px
══════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
    /* KPI: 4 → 2 columns */
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
        margin-bottom: 24px;
    }

    /* Charts: 3 → 2 columns */
    .charts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
        margin-bottom: 24px;
    }

    /* Admin: 2 → 1 column */
    .admin-grid {
        grid-template-columns: 1fr;
    }

    /* FX: side-by-side → stacked */
    .fx-split-container {
        flex-direction: column;
        height: auto;
    }

    .fx-form-card {
        width: 100%;
    }

    /* Review: reduce form width */
    .review-form-container {
        width: 420px;
    }
}

/* ══════════════════════════════════════════════════════
   BREAKPOINT: MOBILE  ≤ 768px
══════════════════════════════════════════════════════ */
@media (max-width: 768px) {
    /* Show hamburger button */
    .sidebar-toggle-btn {
        display: flex;
    }

    /* Show backdrop element */
    .sidebar-backdrop {
        display: block;
    }

    /* Sidebar becomes a fixed off-canvas drawer */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 200;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        width: 280px;
        box-shadow: 4px 0 30px rgba(0, 0, 0, 0.5);
    }

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

    /* Main content fills full width */
    .main-content {
        width: 100%;
    }

    :root {
        --header-height: 60px;
    }

    /* Header: tighter padding, smaller height */
    .content-header {
        padding: 0 16px;
        height: 60px;
        gap: 8px;
        flex-wrap: nowrap;
    }

    .header-title h2 {
        font-size: 15px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 160px;
    }

    .header-title p {
        display: none;
    }

    /* Project selector: hide label, shrink dropdown */
    .global-project-selector {
        margin-left: auto;
        margin-right: 0;
    }

    .control-label {
        display: none;
    }

    .selector-dropdown {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
        max-width: 120px;
    }

    /* Dashboard controls: hide currency toggle on very small, or shrink */
    .global-controls {
        gap: 8px;
    }

    .toggle-btn {
        padding: 5px 10px;
        font-size: 12px;
    }

    /* Page container: reduce padding */
    .page-container {
        padding: 16px;
    }

    /* KPI: 2 → 1 column */
    .kpi-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        margin-bottom: 16px;
    }

    .kpi-card {
        padding: 16px;
        gap: 12px;
    }

    .kpi-value {
        font-size: 18px;
    }

    /* Charts: 2 → 1 column */
    .charts-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        margin-bottom: 16px;
    }

    /* Filter bar: stack vertically */
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .search-box {
        max-width: 100%;
    }

    .filters-container {
        flex-wrap: wrap;
        gap: 8px;
    }

    .filters-container select {
        flex: 1;
        min-width: 130px;
    }

    /* Review split: stacked */
    .review-split-container {
        flex-direction: column;
        height: auto;
        overflow: visible;
        gap: 16px;
    }

    .review-doc-viewer {
        height: 45vh;
        flex: none;
    }

    .review-form-container {
        width: 100%;
        height: auto;
        flex-shrink: 1;
        flex: none;
    }

    /* Chat wrapper: stacked, debug panel hidden by default */
    .chat-wrapper {
        flex-direction: column;
        height: auto;
    }

    .chat-container {
        height: 60vh;
        flex: none;
    }

    .chat-debug-panel {
        width: 100%;
        height: 50vh;
        flex: none;
    }

    /* FX stacked (already done at 1100px) */
    .fx-split-container {
        height: auto;
    }

    /* Marchés */
    .marches-layout {
        grid-template-columns: 1fr !important;
        height: auto;
    }

    /* Admin */
    .admin-grid {
        grid-template-columns: 1fr;
    }

    /* Tables: horizontal scroll already works; ensure it */
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Modal: full width */
    .modal-content-wrapper {
        width: 96%;
    }

    /* Contract details modal: single column on mobile */
    .details-grid {
        grid-template-columns: 1fr;
    }

    .details-full-width {
        grid-column: span 1;
    }

    /* Form rows: single column */
    .form-row {
        grid-template-columns: 1fr;
        flex-direction: column;
    }

    /* Panel header: allow wrapping */
    .panel-header {
        flex-wrap: wrap;
        gap: 8px;
        padding: 14px 16px;
    }

    .panel-header-actions {
        flex-wrap: wrap;
        gap: 6px;
    }

    /* Toast: stretch to near full width */
    .toast-notification {
        min-width: unset;
        max-width: calc(100vw - 32px);
    }

    #toast-container {
        right: 16px;
        left: 16px;
        bottom: 16px;
    }
}

/* ══════════════════════════════════════════════════════
   BREAKPOINT: SMALL MOBILE  ≤ 480px
══════════════════════════════════════════════════════ */
@media (max-width: 480px) {
    /* KPI: full single column */
    .kpi-grid {
        grid-template-columns: 1fr;
    }

    /* Even smaller page padding */
    .page-container {
        padding: 12px;
    }

    .content-header {
        padding: 0 12px;
    }

    .header-title h2 {
        max-width: 120px;
        font-size: 14px;
    }

    /* Hide global controls on smallest screens */
    .global-controls {
        display: none;
    }

    /* Compact KPI cards */
    .kpi-card {
        padding: 14px;
        gap: 10px;
    }

    .kpi-icon {
        width: 40px;
        height: 40px;
    }

    .kpi-value {
        font-size: 16px;
    }

    /* Upload drop zone: reduce padding */
    .upload-drop-zone {
        padding: 40px 20px;
    }

    /* Selector dropdown hidden on smallest (sidebar handles nav) */
    .global-project-selector {
        display: none;
    }
}