/* =========================================
   TABLE OF CONTENTS
   1. Base & Typography
   2. App Layout & Sidebar (Desktop/Mobile)
   3. Main Content & Controls
   4. POS System
   5. POS Modals & Modals Base
   6. Receipt Printing
   7. Ledger & History Tabs
   8. Supplier Prices
   9. Estimators & Calculators
   10. Calculator App
   11. Unit Converter
   12. Cheat Sheets
   13. Reorder / Low Stock List
   14. Calendar & Notes
   15. Contacts Directory
   ========================================= */

/* =========================================
   1. BASE & TYPOGRAPHY
   ========================================= */
:root {
    --bg-dark: #12121c;
    --bg-panel: #1e1e2f;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #5a5a70;
    --accent: #00d2ff;
    --border: #2d2d44;
    --danger: #ff4a4a;
    --success: #00f2c3;
    --cost-color: #f7a072;
    --card-bg: #252638;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
}

/* =========================================
   2. APP LAYOUT & SIDEBAR
   ========================================= */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Mobile Sidebar (Hidden by default) */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

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

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.brand {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    color: var(--accent);
}

.brand-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-title i {
    font-size: 1.5rem;
}

.brand-title h2 {
    font-size: 1.25rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
    overflow-y: auto;
    padding-bottom: 2rem;
}

/* Sleek Sidebar Scrollbar */
.nav-links::-webkit-scrollbar {
    width: 4px;
}

.nav-links::-webkit-scrollbar-track {
    background: transparent;
}

.nav-links::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.85rem 1rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: background 0.2s, color 0.2s;
    flex-shrink: 0;
}

.nav-links a i {
    font-size: 1.25rem;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: rgba(0, 210, 255, 0.1);
    color: var(--accent);
}

/* Desktop App Layout Overrides */
@media (min-width: 768px) {
    .app-container {
        flex-direction: row;
    }

    .sidebar {
        position: static;
        transform: translateX(0);
        width: 260px;
        transition: none;
    }

    .mobile-only {
        display: none !important;
    }

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

/* =========================================
   3. MAIN CONTENT & CONTROLS
   ========================================= */
.main-content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
}

.top-bar {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.header-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-title h1 {
    font-size: 1.5rem;
}

.controls-section {
    background: var(--bg-panel);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.75rem 1rem;
}

.search-box:focus-within {
    border-color: var(--accent);
}

.search-box i {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-right: 0.75rem;
}

.search-box input {
    width: 100%;
    background: transparent;
    border: none;
    color: white;
    font-size: 1rem;
    outline: none;
}

.advanced-filters {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    width: 100%;
}

.filter-group select {
    background: var(--bg-dark);
    color: white;
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 4px;
    outline: none;
    flex-grow: 1;
}

/* Dashboard / Index Cards */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-bottom: 2rem;
}

.item-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    color: var(--text-secondary);
}

.qty-badge {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.qty-in {
    background: rgba(0, 242, 195, 0.15);
    color: var(--success);
}

.qty-out {
    background: rgba(255, 74, 74, 0.15);
    color: var(--danger);
}

.card-body {
    flex-grow: 1;
}

.item-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.item-variant {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
    margin-top: 0.5rem;
}

.card-footer div {
    display: flex;
    flex-direction: column;
}

.card-footer small {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.cost-val {
    color: var(--cost-color);
    font-weight: 500;
}

.price-val {
    color: var(--success);
    font-weight: 700;
    font-size: 1.2rem;
}

@media (min-width: 768px) {
    .main-content {
        padding: 2rem;
    }

    .controls-section {
        padding: 1.5rem;
    }

    .advanced-filters {
        flex-direction: row;
        gap: 1.5rem;
    }

    .filter-group select {
        flex-grow: 0;
    }

    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 1.5rem;
    }

    .item-card {
        transition: transform 0.1s, border-color 0.1s;
    }

    .item-card:hover {
        transform: translateY(-2px);
        border-color: var(--text-muted);
    }
}

/* =========================================
   4. POS SYSTEM
   ========================================= */
.pos-layout {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.pos-products-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pos-controls {
    display: flex;
    gap: 0.5rem;
}

.pos-controls .search-box {
    flex: 1;
}

.pos-product-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-bottom: 1rem;
}

.pos-item {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: border-color 0.1s, background 0.1s;
}

.pos-item:hover {
    border-color: var(--accent);
    background: rgba(0, 210, 255, 0.05);
}

.pos-item-details {
    display: flex;
    flex-direction: column;
}

.pos-item-name {
    font-weight: 600;
    font-size: 1.05rem;
}

.pos-item-variant {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.pos-item-price {
    color: var(--success);
    font-weight: bold;
    font-size: 1.1rem;
}

/* Cart Section */
.pos-cart-section {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.cart-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-header h2 {
    font-size: 1.2rem;
}

.cart-items {
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cart-empty-msg {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem 0;
    font-style: italic;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px dashed var(--border);
    padding-bottom: 0.75rem;
}

.cart-item-info {
    display: flex;
    flex-direction: column;
    width: 45%;
}

.cart-item-title {
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cart-item-sub {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.qty-btn {
    background: var(--bg-dark);
    color: white;
    border: 1px solid var(--border);
    width: 28px;
    height: 28px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qty-btn:hover {
    background: var(--border);
}

.qty-val {
    width: 20px;
    text-align: center;
    font-size: 0.9rem;
}

.cart-item-total {
    width: 65px;
    text-align: right;
    font-weight: bold;
    color: var(--success);
}

/* Cart Summary */
.cart-summary {
    padding: 1rem;
    border-top: 1px solid var(--border);
    background: var(--card-bg);
    border-radius: 0 0 8px 8px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.total-row {
    font-size: 1.4rem;
    color: white;
    font-weight: bold;
    margin-bottom: 1rem;
}

.checkout-btn {
    width: 100%;
    background: var(--success);
    color: #000;
    border: none;
    padding: 1rem;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.2s;
}

.checkout-btn:hover {
    opacity: 0.9;
}

/* Quotations Add-on */
.quote-customer-input {
    padding: 0 1rem 1rem 1rem;
    border-bottom: 1px solid var(--border);
}

.quote-customer-input input {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 0.75rem;
    border-radius: 6px;
    color: white;
    font-size: 0.95rem;
    outline: none;
}

.quote-customer-input input:focus {
    border-color: var(--accent);
}

/* POS Responsive Queries */
@media (max-width: 768px) {
    .pos-layout {
        height: auto;
    }

    .pos-products-section {
        height: 45vh;
        min-height: 250px;
    }

    .cart-items {
        max-height: 40vh;
    }
}

@media (min-width: 768px) {
    .pos-layout {
        flex-direction: row;
        height: calc(100vh - 140px);
    }

    .pos-products-section {
        height: auto;
    }

    .pos-cart-section {
        width: 380px;
        height: 100%;
    }

    .cart-items {
        flex: 1;
        max-height: none;
    }
}

/* =========================================
   5. POS MODALS & MODALS BASE
   ========================================= */
.btn-custom {
    background: var(--bg-panel);
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 0 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s;
    white-space: nowrap;
}

.btn-custom:hover {
    background: rgba(0, 210, 255, 0.1);
}

.editable-price {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-top: 0.25rem;
}

.editable-price:hover {
    color: var(--accent);
}

.btn-discount {
    background: transparent;
    border: 1px dashed var(--border);
    color: var(--danger);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-discount:hover {
    background: rgba(255, 74, 74, 0.1);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-box {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    padding: 1.5rem;
    display: none;
}

.modal-box.active {
    display: block;
}

.modal-box h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.form-group input {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 0.75rem;
    border-radius: 4px;
    color: white;
    font-size: 1rem;
    outline: none;
}

.form-group input:focus {
    border-color: var(--accent);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn-cancel {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem 1rem;
}

.btn-cancel:hover {
    color: white;
}

.btn-confirm {
    background: var(--accent);
    color: black;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
}

.btn-confirm:hover {
    opacity: 0.9;
}

/* =========================================
   6. RECEIPT PRINTING
   ========================================= */
.receipt-modal {
    max-width: 450px;
    background: #fff;
    color: #000;
}

.receipt-paper {
    background: #fff;
    padding: 1rem;
    font-family: 'Courier New', Courier, monospace;
}

.receipt-header {
    text-align: center;
    border-bottom: 2px dashed #000;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.receipt-header h2 {
    margin: 0;
    font-size: 1.5rem;
}

.receipt-header p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

.receipt-id {
    font-weight: bold;
}

.receipt-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.receipt-table th {
    text-align: left;
    border-bottom: 1px dashed #000;
    padding-bottom: 0.5rem;
}

.receipt-table td {
    padding: 0.5rem 0;
}

.receipt-table .td-qty {
    text-align: center;
}

.receipt-table .td-total {
    text-align: right;
}

.receipt-item-name {
    font-weight: bold;
    display: block;
}

.receipt-item-variant {
    font-size: 0.8rem;
    color: #555;
}

.receipt-footer {
    border-top: 2px dashed #000;
    padding-top: 1rem;
}

.receipt-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.receipt-total {
    font-size: 1.25rem;
    font-weight: bold;
    margin-top: 0.5rem;
    border-top: 1px solid #000;
    padding-top: 0.5rem;
}

@media print {
    body * {
        visibility: hidden;
    }

    .receipt-paper,
    .receipt-paper * {
        visibility: visible;
    }

    .receipt-paper {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        margin: 0;
        padding: 0;
    }

    .no-print {
        display: none !important;
    }
}

/* =========================================
   7. LEDGER & HISTORY TABS
   ========================================= */
.ledger-tabs {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--bg-dark);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--accent);
    color: white;
}

.tab-btn.active {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
}

.transaction-section {
    background: var(--bg-panel);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.inventory-table.ledger-table {
    min-width: 700px;
}

.inventory-table th,
.inventory-table td {
    padding: 1.25rem 1rem;
    white-space: nowrap;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    color: white;
    padding: 0.4rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.btn-small:hover {
    background: var(--border);
}

.btn-small.convert-btn {
    border-color: var(--success);
    color: var(--success);
}

.btn-small.convert-btn:hover {
    background: rgba(0, 242, 195, 0.1);
}

@media (max-width: 768px) {
    .ledger-tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
        justify-content: center;
    }
}

/* =========================================
   8. SUPPLIER PRICES
   ========================================= */
.supplier-table th,
.supplier-table td {
    white-space: nowrap;
    font-size: 0.9rem;
    padding: 1rem 0.75rem;
}

.supplier-table th {
    background: var(--bg-dark);
    position: sticky;
    top: 0;
    z-index: 10;
}

.supplier-name {
    color: var(--accent);
    font-size: 0.85rem;
}

.price-null {
    color: var(--text-muted);
    text-align: center;
}

/* =========================================
   9. ESTIMATORS & CALCULATORS
   ========================================= */
.beta-disclaimer {
    background: rgba(255, 170, 0, 0.1);
    border: 1px solid rgba(255, 170, 0, 0.4);
    border-left: 4px solid #ffaa00;
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    color: #ffd073;
}

.beta-disclaimer i {
    font-size: 1.5rem;
    color: #ffaa00;
}

.disclaimer-text {
    font-size: 0.9rem;
    line-height: 1.4;
}

.estimators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    padding-bottom: 2rem;
}

.calc-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.calc-header {
    background: var(--bg-dark);
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
}

.calc-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.calc-header i {
    font-size: 1.25rem;
}

.calc-body {
    padding: 1.5rem;
    flex: 1;
}

.input-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.input-row .form-group {
    flex: 1;
    min-width: 80px;
}

.calc-results {
    display: flex;
    flex-wrap: wrap;
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
}

.result-box {
    flex: 1;
    min-width: 22%;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.result-box:last-child {
    border-right: none;
}

.result-box small {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.result-box strong {
    font-size: 1.1rem;
    color: white;
}

.result-box.highlight strong {
    color: var(--success);
    font-size: 1.25rem;
}

@media (max-width: 768px) {
    .estimators-grid {
        grid-template-columns: 1fr;
    }

    .input-row {
        flex-direction: column;
        gap: 0.75rem;
    }

    .result-box {
        min-width: 45%;
        border-bottom: 1px solid var(--border);
    }

    .result-box:nth-child(even) {
        border-right: none;
    }
}

/* =========================================
   10. CALCULATOR APP
   ========================================= */
.calc-layout {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.calc-device {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 100%;
    max-width: 380px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.calc-screen {
    background: var(--bg-dark);
    padding: 2rem 1.5rem;
    text-align: right;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.calc-expression {
    font-size: 1.5rem;
    color: var(--text-primary);
    word-wrap: break-word;
    letter-spacing: 2px;
    min-height: 2rem;
}

.calc-live-result {
    font-size: 2.5rem;
    color: var(--text-muted);
    font-weight: 300;
    margin-top: 0.5rem;
    transition: color 0.2s;
}

.calc-live-result.active-preview {
    color: var(--success);
}

.calc-keypad {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
}

.calc-btn {
    background: var(--bg-panel);
    border: none;
    padding: 1.5rem 0;
    font-size: 1.25rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.1s;
}

.calc-btn:hover {
    background: var(--bg-dark);
}

.calc-btn:active {
    background: var(--border);
}

.btn-operator {
    color: var(--accent);
    font-weight: bold;
    font-size: 1.5rem;
}

.btn-action {
    color: var(--danger);
    font-weight: 500;
}

.btn-equal {
    background: var(--accent);
    color: #000;
    font-weight: bold;
    font-size: 1.5rem;
}

.btn-equal:hover {
    background: #00b3cc;
}

.calc-history-panel {
    flex: 1;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    min-height: 400px;
    max-height: 600px;
    display: flex;
    flex-direction: column;
}

.history-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    background: var(--bg-dark);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.hist-content {
    text-align: right;
}

.hist-expr {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.hist-res {
    font-size: 1.25rem;
    color: var(--success);
    font-weight: bold;
}

.hist-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    border-top: 1px dashed var(--border);
    padding-top: 0.75rem;
}

.hist-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.hist-btn:hover {
    background: var(--border);
    color: white;
}

.hist-btn.hist-del:hover {
    background: rgba(255, 74, 74, 0.1);
    color: var(--danger);
    border-color: var(--danger);
}

@media (max-width: 768px) {
    .calc-layout {
        flex-direction: column;
    }

    .calc-device {
        max-width: 100%;
    }

    .calc-history-panel {
        width: 100%;
        min-height: 250px;
    }
}

/* =========================================
   11. UNIT CONVERTER
   ========================================= */
.converter-layout {
    display: flex;
    justify-content: center;
    padding-top: 2rem;
}

.converter-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.conv-category-wrapper {
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.conv-category-wrapper label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.conv-category-wrapper select {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: white;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
}

.conv-workspace {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.conv-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.conv-box label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.conv-input-group {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.conv-input-group.output-group {
    border-color: var(--success);
}

.conv-input-group input {
    background: var(--bg-dark);
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    font-size: 1.5rem;
    color: white;
    width: 100%;
    outline: none;
}

.conv-input-group.output-group input {
    background: rgba(0, 242, 195, 0.05);
    color: var(--success);
    font-weight: bold;
}

.conv-input-group select {
    background: var(--bg-dark);
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    outline: none;
}

.conv-swap-btn {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    margin-top: 1.5rem;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.conv-swap-btn:hover {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
}

.conv-note {
    text-align: center;
    margin-top: 2rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.mobile-hide {
    display: block;
}

.desktop-hide {
    display: none;
}

@media (max-width: 768px) {
    .converter-layout {
        padding-top: 0;
    }

    .conv-workspace {
        flex-direction: column;
    }

    .conv-swap-btn {
        transform: rotate(0deg);
        margin: 0;
    }

    .mobile-hide {
        display: none;
    }

    .desktop-hide {
        display: block;
    }
}

/* =========================================
   12. CHEAT SHEETS
   ========================================= */
.cs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    padding-bottom: 2rem;
}

.cs-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.cs-header {
    background: var(--bg-dark);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--accent);
}

.cs-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.cs-table-wrapper {
    overflow-x: auto;
}

.cs-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.cs-table th,
.cs-table td {
    padding: 0.85rem 1.5rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.cs-table th {
    font-size: 0.85rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.2);
}

.cs-table tr:last-child td {
    border-bottom: none;
}

.cs-table tbody tr:hover {
    background: rgba(0, 210, 255, 0.03);
}

.cs-table td:first-child {
    font-weight: 600;
    color: white;
}

/* =========================================
   13. REORDER / LOW STOCK LIST
   ========================================= */
.threshold-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
}

.reorder-table th,
.reorder-table td {
    padding: 1rem;
    white-space: nowrap;
}

.stock-critical {
    color: #ff4a4a;
    font-weight: bold;
    background: rgba(255, 74, 74, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.stock-warning {
    color: #ffaa00;
    font-weight: bold;
    background: rgba(255, 170, 0, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.reorder-item-name {
    font-weight: 600;
    color: white;
    display: block;
}

.reorder-item-variant {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* =========================================
   14. CALENDAR & NOTES
   ========================================= */
.cal-layout {
    display: flex;
    gap: 1.5rem;
    height: calc(100vh - 120px);
}

.cal-wrapper {
    flex: 1.2;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    overflow-y: auto;
}

.notes-wrapper {
    flex: 1;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.notes-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notes-header h3 {
    color: var(--accent);
}

#editor-container {
    flex: 1;
    font-size: 1rem;
    color: white;
}

.ql-toolbar.ql-snow {
    background: var(--bg-dark);
    border: none !important;
    border-bottom: 1px solid var(--border) !important;
}

.ql-container.ql-snow {
    border: none !important;
    background: var(--bg-panel);
}

.ql-snow .ql-stroke {
    stroke: var(--text-secondary);
}

.ql-snow .ql-fill {
    fill: var(--text-secondary);
}

.ql-snow .ql-picker {
    color: var(--text-secondary);
}

:root {
    --fc-page-bg-color: transparent;
    --fc-neutral-bg-color: var(--bg-dark);
    --fc-neutral-text-color: var(--text-primary);
    --fc-border-color: var(--border);
    --fc-button-text-color: white;
    --fc-button-bg-color: var(--bg-dark);
    --fc-button-border-color: var(--border);
    --fc-button-hover-bg-color: var(--border);
    --fc-button-hover-border-color: var(--accent);
    --fc-button-active-bg-color: var(--accent);
    --fc-button-active-border-color: var(--accent);
    --fc-today-bg-color: rgba(0, 210, 255, 0.05);
}

.fc .fc-toolbar-title {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.fc-theme-standard td,
.fc-theme-standard th {
    border-color: var(--border);
}

.fc-daygrid-day:hover {
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
}

.custom-event-dot {
    background: var(--success);
    color: #000;
    border: none;
    border-radius: 4px;
    padding: 2px 4px;
    font-size: 0.75rem;
    font-weight: bold;
    text-align: center;
}

@media (max-width: 900px) {
    .cal-layout {
        flex-direction: column;
        height: auto;
    }

    .cal-wrapper {
        min-height: 400px;
        padding: 0.5rem;
    }

    .notes-wrapper {
        min-height: 400px;
    }

    .fc .fc-toolbar-title {
        font-size: 1rem !important;
    }

    .fc .fc-button {
        padding: 0.2rem 0.5rem !important;
        font-size: 0.85rem !important;
    }
}

/* =========================================
   15. CONTACTS DIRECTORY
   ========================================= */
.contacts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding-bottom: 2rem;
}

.contact-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: transform 0.2s, border-color 0.2s;
}

.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.contact-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.contact-info h3 {
    font-size: 1.15rem;
    color: white;
    margin-bottom: 0.25rem;
}

.contact-company {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.contact-role-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: bold;
    text-transform: uppercase;
}

.role-supplier {
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent);
}

.role-contractor {
    background: rgba(255, 170, 0, 0.1);
    color: #ffaa00;
}

.role-customer {
    background: rgba(0, 242, 195, 0.1);
    color: var(--success);
}

.role-employee {
    background: rgba(180, 180, 180, 0.1);
    color: #ccc;
}

.contact-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.contact-phone {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
    background: var(--bg-dark);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    transition: background 0.2s;
}

.contact-phone:hover {
    background: var(--border);
}

.contact-phone i {
    color: var(--success);
}

.contact-notes {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.75rem;
    border-radius: 4px;
    border-left: 2px solid var(--border);
}

.contact-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    border-top: 1px dashed var(--border);
    padding-top: 1rem;
}

.contact-actions button {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.4rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.contact-actions button:hover {
    color: white;
    background: var(--bg-dark);
}

.contact-actions .btn-delete:hover {
    color: var(--danger);
    border-color: rgba(255, 74, 74, 0.4);
}