:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --success-color: #10b981;
    --success-hover: #059669;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --info-color: #06b6d4;
    --info-hover: #0891b2;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
    background-color: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
}

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #6366f1 100%);
    color: white;
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

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

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.nav-links {
    display: flex;
    gap: 0.75rem;
}

.nav-links .btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.nav-links .btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.btn {
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: var(--success-hover);
    box-shadow: var(--shadow-md);
}

.btn-warning {
    background-color: var(--warning-color);
    color: white;
}

.btn-warning:hover {
    background-color: var(--warning-hover);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: var(--danger-hover);
    box-shadow: var(--shadow-md);
}

.btn-info {
    background-color: var(--info-color);
    color: white;
}

.btn-info:hover {
    background-color: var(--info-hover);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--gray-600);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--gray-700);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 1.5rem;
    font-size: 1rem;
}

.search-bar {
    background-color: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    border: 1px solid var(--gray-100);
}

.search-input,
.date-input,
.select-input {
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 0.875rem;
    outline: none;
    transition: all 0.2s ease;
    background-color: white;
}

.search-input:focus,
.date-input:focus,
.select-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-input {
    min-width: 180px;
    flex: 1;
    max-width: 280px;
}

.date-input {
    min-width: 140px;
}

.date-filter {
    display: flex;
    gap: 0.5rem;
}

.menu-btn {
    white-space: nowrap;
}

.date-input {
    padding: 0.5rem 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background-color: white;
    color: var(--gray-800);
    cursor: pointer;
}

.date-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.select-input {
    min-width: 140px;
}

.report-links {
    display: flex;
    gap: 0.75rem;
    margin-left: auto;
}

.add-section {
    background-color: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    border: 1px solid var(--gray-100);
}

.add-section h3 {
    color: var(--gray-800);
    margin-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.add-section form {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.add-section .input {
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 0.875rem;
    outline: none;
    min-width: 140px;
    flex: 1;
    max-width: 180px;
    transition: all 0.2s ease;
    background-color: white;
}

.add-section .input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.table-section {
    background-color: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
    overflow-x: auto;
}

.table-section h3 {
    color: var(--gray-800);
    margin-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    min-width: 600px;
}

.data-table th,
.data-table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-100);
}

.data-table th {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    color: var(--gray-700);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.data-table tbody tr:hover {
    background-color: var(--gray-50);
}

.data-table tbody tr {
    cursor: pointer;
    transition: background-color 0.15s ease;
}

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

.data-table .empty {
    text-align: center;
    color: var(--gray-400);
    padding: 3rem;
    font-style: italic;
}

.data-table tfoot th {
    background-color: var(--gray-100);
    color: var(--gray-800);
    font-weight: 700;
    font-size: 0.875rem;
}

.surname-group {
    margin-bottom: 2rem;
}

.surname-header {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    padding-left: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.customer-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.customer-card {
    background-color: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
    cursor: pointer;
    transition: all 0.2s ease;
}

.customer-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.customer-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.customer-phone {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.25rem;
}

.customer-address {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.customer-info {
    background-color: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    border: 1px solid var(--gray-100);
}

.customer-info h3 {
    color: var(--gray-800);
    margin-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-row {
    margin-bottom: 0.75rem;
    padding: 0.75rem;
    background-color: var(--gray-50);
    border-radius: var(--radius);
    display: flex;
    align-items: flex-start;
}

.info-label {
    font-weight: 600;
    color: var(--gray-500);
    display: inline-block;
    width: 70px;
    flex-shrink: 0;
    font-size: 0.875rem;
}

.info-value {
    color: var(--gray-800);
    font-size: 0.875rem;
    word-break: break-all;
}

.filter-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-bar span {
    font-size: 0.875rem;
    color: var(--gray-500);
    background-color: var(--gray-100);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
}

.action-bar {
    margin-top: 1.5rem;
    text-align: center;
}

.action-col {
    white-space: nowrap;
}

.action-col .btn {
    margin-right: 0.375rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-nav {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.mobile-nav .btn {
    display: block;
    width: 100%;
    text-align: left;
    margin-bottom: 0.5rem;
}

@media (max-width: 1024px) {
    .container {
        padding: 0.75rem;
    }

    .header h1 {
        font-size: 1.25rem;
    }

    .search-input {
        max-width: none;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 15px;
    }

    .container {
        padding: 0.5rem;
    }

    .header {
        padding: 0.75rem;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
        position: absolute;
        right: 1rem;
        top: 1rem;
    }

    .mobile-nav.active {
        display: block;
    }

    .search-bar {
        flex-wrap: nowrap;
        padding: 0.5rem;
        gap: 0.5rem;
    }

    .search-bar .btn {
        flex-shrink: 0;
        white-space: nowrap;
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }

    .search-input {
        max-width: 150px;
        flex: 1;
        min-width: 50px;
        padding: 0.5rem 0.75rem;
    }

    .date-input {
        min-width: 120px;
        max-width: 140px;
    }

    .select-input {
        min-width: 120px;
        max-width: 140px;
    }

    .report-links {
        margin-left: 0;
        justify-content: flex-start;
        flex-wrap: wrap;
        width: 100%;
    }

    .add-section form {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .add-section .input {
        min-width: 120px;
        max-width: 140px;
        flex: 1;
    }

    .add-section .input-address {
        min-width: 100%;
        max-width: 100%;
    }

    .data-table {
        font-size: 0.75rem;
        min-width: 400px;
    }

    .customer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .customer-card {
        padding: 1rem;
    }

    .customer-name {
        font-size: 1rem;
    }

    .customer-phone,
    .customer-address {
        font-size: 0.75rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.625rem 0.75rem;
    }

    .table-section {
        padding: 0.75rem;
    }

    .info-row {
        flex-direction: column;
        gap: 0.25rem;
    }

    .info-label {
        width: auto;
    }

    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.8125rem;
    }

    .action-col .btn {
        display: block;
        width: 100%;
        margin-right: 0;
        margin-bottom: 0.375rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .header h1 {
        font-size: 1.125rem;
    }

    .search-bar {
        padding: 0.5rem;
        gap: 0.375rem;
    }

    .search-input {
        max-width: 120px;
        padding: 0.4rem 0.5rem;
        font-size: 0.75rem;
    }

    .search-bar .btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.6875rem;
    }

    .add-section,
    .table-section,
    .customer-info {
        padding: 0.75rem;
        border-radius: var(--radius-md);
    }

    .data-table {
        font-size: 0.6875rem;
        min-width: 320px;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem 0.625rem;
    }

    .btn {
        padding: 0.5rem 0.875rem;
        font-size: 0.75rem;
    }

    .btn-lg {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
}

.date-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.date-popup.active {
    display: flex;
}

.date-popup-content {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-width: 200px;
}

.date-option {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--radius);
    background-color: var(--gray-50);
    color: var(--gray-700);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.date-option:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.date-select-btn {
    white-space: nowrap;
    min-width: 100px;
}

@media print {
    body {
        background-color: white;
        font-size: 12px;
    }

    .container {
        max-width: none;
        padding: 0;
    }

    .header,
    .nav-links,
    .mobile-menu-btn,
    .action-bar,
    .filter-bar .btn,
    .btn-edit,
    .btn-delete {
        display: none !important;
    }

    .search-bar,
    .add-section,
    .table-section,
    .customer-info {
        box-shadow: none;
        border: none;
        margin-bottom: 1rem;
    }

    .data-table {
        font-size: 11px;
        border-collapse: collapse;
    }

    .data-table th,
    .data-table td {
        border: 1px solid #ddd;
        padding: 6px 8px;
    }

    .data-table th {
        background-color: #f8f9fa;
    }

    @page {
        size: A4;
        margin: 2cm;
    }
}