/* Mobile Bottom Navigation */

.mobile-bottom-nav {
    display: none;
}

.mobile-fab {
    display: none;
}

.mobile-fab.hidden-fab {
    display: none !important;
}

/* Responsive - Tablet */

@media (max-width: 900px) {
    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: 220px;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .content {
        flex-direction: column;
    }

    .toolbar {
        display: none;
    }

    .section-header {
        flex-wrap: wrap;
    }
}

/* Responsive - Mobile */

@media (max-width: 640px) {
    /* Layout */
    html, body {
        overflow: hidden;
        overscroll-behavior: none;
    }

    .app {
        padding-bottom: 0;
    }

    /* Prevent iOS zoom-on-focus: inputs must be >= 16px on mobile */
    input, textarea, select {
        font-size: 16px;
    }

    /* Hide the desktop footer on mobile to save space */
    .footer {
        display: none;
    }

    /* Header */
    .header {
        padding: 10px 12px;
    }

    .header h1 {
        font-size: 1rem;
    }

    #sidebarToggleBtn {
        display: none;
    }

    #newNoteBtn {
        display: none;
    }

    .header-right {
        gap: 6px;
    }

    .btn-icon {
        width: 44px;
        height: 44px;
    }

    .btn-icon svg {
        width: 20px;
        height: 20px;
    }

    /* Mobile Panel System */
    .main-container {
        flex-direction: column;
        position: relative;
        flex: 1;
        overflow: hidden;
    }

    .sidebar {
        position: absolute;
        inset: 0 0 calc(60px + env(safe-area-inset-bottom)) 0;
        width: 100%;
        height: auto;
        border: none;
        z-index: 1;
        display: none !important;
        overflow: hidden;
        flex-direction: column;
    }

    .sidebar.mobile-active {
        display: flex !important;
    }

    .content {
        position: absolute;
        inset: 0 0 calc(60px + env(safe-area-inset-bottom)) 0;
        overflow: hidden;
    }

    .note-view {
        position: absolute;
        inset: 0;
        border: none;
        display: none !important;
        flex-direction: column;
    }

    .note-view.mobile-active {
        display: flex !important;
    }

    .note-view-row {
        flex-direction: column;
        position: relative;
    }

    .editor-section,
    .preview-section {
        flex: 1 1 50%;
        min-height: 0;
        overflow: hidden;
    }

    .preview-section {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .editor-section .editor-wrapper {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .resize-handle {
        width: 100% !important;
        height: 12px !important;
        cursor: row-resize !important;
        flex-shrink: 0;
        touch-action: none;
    }

    .resize-handle .resize-handle-line {
        width: 100% !important;
        height: 2px !important;
    }

    .resize-handle:hover .resize-handle-line,
    .resize-handle.active .resize-handle-line {
        width: 100% !important;
        height: 3px !important;
    }

    .resize-handle-dot {
        display: none;
    }

    #aiChatPanel.hidden {
        display: none !important;
    }

    #aiChatPanel:not(.hidden) {
        position: absolute !important;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 50;
        display: flex;
        flex-direction: column;
        width: 100%;
        height: 100%;
        border: none;
        opacity: 1;
    }

    /* Toolbar: scrollable strip instead of hidden */
    .toolbar {
        display: flex;
        overflow-x: auto;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
        gap: 2px;
        padding-right: 4px;
    }

    .toolbar::-webkit-scrollbar {
        display: none;
    }

    .toolbar-btn {
        width: 36px;
        height: 36px;
        flex-shrink: 0;
    }

    .toolbar-btn svg {
        width: 16px;
        height: 16px;
    }

    .section-header {
        flex-wrap: nowrap;
        gap: 8px;
        padding: 8px 12px;
    }

    .editor-info {
        flex-shrink: 0;
    }

    /* Sidebar: better mobile layout */
    .sidebar-header {
        padding: 12px;
    }

    .search-box {
        margin-bottom: 6px;
    }

    .notes-list {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .note-item {
        padding: 14px 48px 14px 12px;
        min-height: 64px;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .note-item .delete-note {
        opacity: 1;
        width: 36px;
        height: 36px;
        right: 6px;
    }

    /* Editor */
    .editor-gutter {
        display: none;
    }

    .editor {
        font-size: 1rem;
        padding: 14px;
        -webkit-overflow-scrolling: touch;
    }

    /* Preview */
    .preview {
        padding: 14px;
        -webkit-overflow-scrolling: touch;
    }

    /* Modal */
    .modal {
        width: 100%;
        max-width: 100%;
        max-height: 92dvh;
        border-radius: var(--radius) var(--radius) 0 0;
        margin-top: auto;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
    }

    .modal-overlay {
        align-items: flex-end;
    }

    @keyframes slideIn {
        from { transform: translateY(100%); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
    }

    .form-actions {
        flex-wrap: wrap;
    }

    .form-actions .btn {
        flex: 1;
        min-width: 100px;
        justify-content: center;
    }

    /* Bottom Navigation Bar */
    .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(60px + env(safe-area-inset-bottom));
        padding-bottom: env(safe-area-inset-bottom);
        background: var(--bg-main);
        border-top: 1px solid var(--border);
        z-index: 200;
        box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.08);
        backdrop-filter: blur(10px);
    }

    [data-theme="dark"] .mobile-bottom-nav {
        box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.4);
    }

    .mobile-nav-btn {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 3px;
        background: transparent;
        border: none;
        cursor: pointer;
        color: var(--text-muted);
        font-size: 0.7rem;
        font-weight: 500;
        font-family: var(--font-sans);
        transition: color var(--transition), background var(--transition);
        padding: 6px 4px;
        -webkit-tap-highlight-color: transparent;
        position: relative;
    }

    .mobile-nav-btn.active svg {
        color: var(--primary);
    }

    .mobile-nav-btn.active span {
        color: var(--primary);
    }

    .mobile-nav-btn svg {
        width: 22px;
        height: 22px;
        transition: transform var(--transition);
    }

    .mobile-nav-btn span {
        line-height: 1;
    }

    .mobile-nav-btn.active {
        color: var(--primary);
    }

    .mobile-nav-btn.active svg {
        transform: translateY(-1px);
    }

    .mobile-nav-btn.active::before {
        content: '';
        position: absolute;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 32px;
        height: 3px;
        background: var(--primary);
        border-radius: 0 0 4px 4px;
    }

    /* Floating Action Button */
    .mobile-fab {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        bottom: calc(72px + env(safe-area-inset-bottom));
        right: 18px;
        width: 52px;
        height: 52px;
        background: var(--primary);
        color: white;
        border: none;
        border-radius: 50%;
        box-shadow: none;
        cursor: pointer;
        z-index: 199;
        transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
        -webkit-tap-highlight-color: transparent;
    }

    .mobile-fab svg {
        width: 24px;
        height: 24px;
    }

    .mobile-fab:active {
        transform: scale(0.92);
        box-shadow: none;
    }

    .mobile-fab.hidden-fab {
        opacity: 0;
        pointer-events: none;
        transform: scale(0.8);
    }
}