:root {
    --primary-color: #ff7a00;
    --secondary-color: #0f766e;
    --accent-color: #f59e0b;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-color: #1f2937;
    --muted-color: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: radial-gradient(circle at top left, rgba(245, 158, 11, 0.2), transparent 20%), linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
    color: var(--text-color);
    min-height: 100vh;
}

.hidden {
    display: none !important;
}

.login-modal {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 122, 0, 0.95), rgba(15, 118, 110, 0.92));
    padding: 20px;
}

.login-card {
    width: min(420px, 100%);
    background: rgba(255, 255, 255, 0.97);
    border-radius: 22px;
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.2);
    padding: 28px 24px;
}

.login-brand {
    text-align: center;
    color: var(--secondary-color);
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.login-card h2 {
    text-align: center;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    margin-bottom: 18px;
    color: var(--muted-color);
}

.demo-box {
    margin-top: 18px;
    background: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 0.9rem;
    color: #7c2d12;
}

.app-shell {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 110px 22px 22px;
    min-height: 100vh;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #ff7a00 0%, #0f766e 100%);
    color: white;
    padding: 18px 20px;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.2);
    z-index: 100;
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
}

.header h1 {
    margin: 0;
    font-size: 1.8em;
    font-weight: 800;
    letter-spacing: 0.4px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

#cashierBadge {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 0.85em;
    font-weight: 700;
}

.btn-login,
.btn-logout,
.btn-menu {
    background: var(--secondary-color);
    color: white;
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    font-weight: 800;
}

.btn-logout,
.btn-menu {
    width: auto;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-menu {
    min-width: 96px;
}

.product-modal {
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(15, 23, 42, 0.55);
    padding: 28px 18px;
}

.product-panel {
    width: min(640px, 92vw);
    max-height: 82vh;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(229, 231, 235, 0.9);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 20px 18px;
    overflow-y: auto;
}

.product-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 16px 0 18px;
}

.product-item {
    display: grid;
    grid-template-columns: 1.4fr 0.9fr 0.7fr auto auto;
    gap: 8px;
    align-items: end;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #f8fafc;
}

.product-edit-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.product-edit-group label {
    font-size: 0.72rem;
    color: var(--muted-color);
    font-weight: 700;
}

.product-item input {
    width: 100%;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.product-card {
    background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 16px 14px;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.product-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 22px rgba(15, 23, 42, 0.08);
}

.product-card-disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.product-stock {
    margin-top: 2px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.product-stock.out-of-stock {
    color: #b91c1c;
}


.product-form {
    border-top: 1px solid var(--border-color);
    padding-top: 18px;
}

.product-form h4 {
    margin: 0 0 12px;
    color: var(--secondary-color);
    font-size: 1.05rem;
}

.btn-small {
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 0.8rem;
    width: auto;
}

.btn-save-product {
    background: #16a34a;
    color: white;
}

.btn-delete-product {
    background: #ef4444;
    color: white;
}

.products-section,
.cart-section {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    padding: 22px;
    border-radius: 20px;
    border: 1px solid rgba(229, 231, 235, 0.9);
    box-shadow: var(--shadow);
}

.products-section {
    flex: 2.2;
    overflow-y: auto;
}

.cart-section {
    flex: 1.05;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 100px;
    min-height: calc(100vh - 120px);
}

h2 {
    margin-top: 0;
    color: var(--secondary-color);
    font-size: 1.4em;
    font-weight: 800;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    margin-top: 18px;
}

.product-card {
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.11);
    border-color: var(--primary-color);
    background: linear-gradient(180deg, #fff7ed 0%, #ffffff 100%);
}

.product-name {
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-color);
    line-height: 1.35;
    min-height: 2.7em;
}

.product-price {
    color: var(--primary-color);
    font-weight: 800;
    background: #fff7ed;
    border-radius: 999px;
    padding: 6px 10px;
    display: inline-block;
}

.cart-items {
    flex-grow: 1;
    overflow-y: auto;
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cart-item {
    display: grid;
    grid-template-columns: 1.2fr auto auto;
    gap: 10px;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background: #f8fafc;
}

.qty-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: white;
    border-radius: 999px;
    padding: 5px;
    border: 1px solid var(--border-color);
}

button {
    cursor: pointer;
    padding: 8px 12px;
    border: none;
    border-radius: 10px;
    font-weight: 700;
    transition: transform 0.15s ease, background 0.2s ease, opacity 0.2s ease;
}

button:hover {
    transform: translateY(-1px);
}

.btn-minus {
    background: #fee2e2;
    color: #991b1b;
}

.btn-plus {
    background: #d1fae5;
    color: #065f46;
}

.btn-remove {
    background: #f3f4f6;
    color: #ef4444;
}

.btn-action {
    width: 100%;
    padding: 14px 15px;
    background: var(--primary-color);
    color: white;
    font-size: 1.02em;
    margin-top: 14px;
}

.btn-action:hover {
    background: var(--secondary-color);
}

.btn-clear {
    background: #94a3b8;
    color: white;
    margin-top: 10px;
}

.btn-clear:hover {
    background: #64748b;
}

.btn-print,
.btn-export {
    background: #2563eb;
    color: white;
    padding: 8px 12px;
    font-size: 0.85em;
    width: auto;
    margin-top: 0;
}

.btn-export {
    background: #0f766e;
}

.btn-print:hover {
    background: #1d4ed8;
}

.btn-export:hover {
    background: #115e59;
}

.total-section {
    background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
    padding: 16px;
    border-radius: 16px;
    margin-bottom: 18px;
    border: 1px solid #dbeafe;
}

.total-amount {
    font-size: 1.45em;
    font-weight: 800;
    color: var(--primary-color);
}

.report-section {
    margin-top: 8px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 14px;
}

.report-section h3 {
    margin: 0 0 12px 0;
    color: var(--secondary-color);
}

.report-box {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.report-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 12px;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.55);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background: white;
    padding: 24px;
    border-radius: 18px;
    width: min(420px, 100%);
    box-shadow: 0 20px 55px rgba(0, 0, 0, 0.22);
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 700;
}

.input-group input {
    width: 100%;
    padding: 12px 10px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1.05em;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
}

.change-amount {
    font-size: 1.1em;
    font-weight: 800;
    color: #16a34a;
    margin-top: 12px;
    text-align: center;
    background: #f0fdf4;
    border-radius: 10px;
    padding: 10px;
}

.history-modal {
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(15, 23, 42, 0.55);
    padding: 28px 18px;
}

.history-panel {
    width: min(440px, 92vw);
    max-height: 82vh;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(229, 231, 235, 0.9);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 20px 18px;
    position: relative;
    overflow: hidden;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 10px;
}

.history-header h3 {
    margin: 0;
    color: var(--secondary-color);
    font-size: 1.1em;
    font-weight: 800;
}

.history-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.btn-close-history {
    background: #e5e7eb;
    color: #374151;
    padding: 7px 10px;
    border-radius: 10px;
    font-size: 0.8rem;
}

#transactionHistory {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 52vh;
    overflow-y: auto;
    padding-right: 2px;
}

#transactionHistory > div {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 12px;
}

.empty-state {
    text-align: center;
    color: var(--muted-color);
    margin-top: 20px;
    padding: 20px 10px;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
    background: #f8fafc;
}

.print-container {
    display: none;
}

@media print {
    body {
        margin: 0;
        padding: 0;
        display: block;
        background: white;
    }

    .login-modal,
    .app-shell,
    .header,
    .products-section,
    .cart-section,
    .modal {
        display: none !important;
    }

    .print-container {
        display: block !important;
        width: 100%;
        padding: 0;
        background: white;
    }

    .receipt {
        width: 100%;
        max-width: 420px;
        margin: 0 auto;
        padding: 16px;
        font-family: 'Courier New', monospace;
        color: #000;
    }

    .receipt-header {
        text-align: center;
        border-bottom: 2px dashed #111;
        padding-bottom: 10px;
        margin-bottom: 14px;
    }

    .receipt-header h2 {
        margin: 0 0 6px;
        font-size: 20px;
    }

    .receipt-detail,
    .receipt-line {
        display: flex;
        justify-content: space-between;
        gap: 10px;
        margin-bottom: 6px;
    }

    .receipt-list {
        margin: 16px 0;
        border-top: 1px dashed #111;
        border-bottom: 1px dashed #111;
        padding: 10px 0;
    }

    .receipt-item {
        display: flex;
        justify-content: space-between;
        gap: 10px;
        margin-bottom: 6px;
    }

    .receipt-total {
        border-top: 2px solid #111;
        padding-top: 10px;
        margin-top: 10px;
        font-weight: 700;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 14px 14px;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .header h1 {
        font-size: 1.3em;
    }

    .header-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    #cashierBadge {
        flex: 1 1 100%;
        text-align: center;
    }

    .app-shell {
        flex-direction: column;
        padding: 130px 14px 18px;
    }

    .products-section,
    .cart-section {
        width: 100%;
        padding: 16px;
    }

    .cart-section {
        position: static;
        min-height: auto;
    }

    .cart-item {
        grid-template-columns: 1fr;
        align-items: stretch;
    }

    .qty-controls {
        justify-content: space-between;
    }

    .history-header,
    .history-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .product-item {
        grid-template-columns: 1fr;
    }

    .modal-content,
    .history-panel,
    .product-panel {
        width: min(100%, 420px);
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 20px 16px;
        border-radius: 18px;
    }

    .login-brand {
        font-size: 1.2rem;
    }

    .btn-login,
    .btn-logout,
    .btn-menu,
    .btn-action,
    .btn-clear,
    .btn-print,
    .btn-export {
        width: 100%;
    }

    .header-actions {
        display: grid;
        grid-template-columns: 1fr;
        width: 100%;
    }

    .product-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .product-name {
        font-size: 0.94rem;
    }

    .total-section,
    .report-section {
        padding: 12px;
    }
}