/* 
 * Tra Cứu Bill - Main Stylesheet
 * Cloudflare Pages Frontend
 * Version 1.0.0
 */

/* =========== VARIABLES & RESET =========== */
:root {
    /* Primary Colors */
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --primary-light: #eef2ff;
    
    /* Secondary Colors */
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --info: #7209b7;
    
    /* Grayscale */
    --white: #ffffff;
    --light: #f8f9fa;
    --gray: #6c757d;
    --dark: #212529;
    --black: #000000;
    
    /* Backgrounds */
    --bg-body: #f8fafc;
    --bg-card: var(--white);
    --bg-sidebar: #f1f5f9;
    
    /* Borders */
    --border-color: #dee2e6;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    
    /* Typography */
    --font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-size-base: 14px;
    --line-height-base: 1.5;
    
    /* Transitions */
    --transition: all 0.2s ease-in-out;
}

[data-bs-theme="dark"] {
    --primary: #5a6fdb;
    --primary-dark: #4a5fc8;
    --primary-light: #2d3748;
    
    --secondary: #4a5fc8;
    --success: #0ea5e9;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #8b5cf6;
    
    --white: #1e293b;
    --light: #334155;
    --gray: #94a3b8;
    --dark: #f1f5f9;
    --black: #ffffff;
    
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #1e293b;
    
    --border-color: #334155;
}

/* =========== BASE STYLES =========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    height: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--dark);
    background-color: var(--bg-body);
    min-height: 100vh;
    overflow-x: hidden;
}

/* =========== TYPOGRAPHY =========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

small {
    font-size: 0.875rem;
    color: var(--gray);
}

.text-primary { color: var(--primary) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-info { color: var(--info) !important; }
.text-muted { color: var(--gray) !important; }

/* =========== LAYOUT & CONTAINERS =========== */
.container-fluid {
    padding-left: 1rem;
    padding-right: 1rem;
}

.main-wrapper {
    display: flex;
    min-height: calc(100vh - 56px);
}

/* =========== HEADER =========== */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    box-shadow: var(--shadow-md);
    height: 56px;
    padding: 0.5rem 1rem;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* =========== SIDEBAR =========== */
.sidebar {
    width: 250px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 1rem 0;
    position: fixed;
    top: 56px;
    bottom: 0;
    left: 0;
    z-index: 1020;
    overflow-y: auto;
    transition: var(--transition);
}

.sidebar.collapsed {
    width: 60px;
}

.sidebar .nav-link {
    color: var(--dark);
    padding: 0.75rem 1.5rem;
    margin: 0.25rem 0.5rem;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition);
    position: relative;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary);
    text-decoration: none;
}

.sidebar .nav-link.active {
    font-weight: 600;
    border-left: 3px solid var(--primary);
}

.sidebar .nav-link i {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.sidebar .nav-link .badge {
    position: absolute;
    right: 1rem;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}

.sidebar.collapsed .nav-link span:not(.badge),
.sidebar.collapsed .nav-link .badge {
    display: none;
}

.sidebar.collapsed .nav-link {
    justify-content: center;
    padding: 0.75rem;
}

/* =========== MAIN CONTENT =========== */
.main-content {
    margin-left: 250px;
    padding: 1rem;
    min-height: calc(100vh - 56px);
    transition: var(--transition);
}

.sidebar.collapsed + .main-content {
    margin-left: 60px;
}

/* =========== CARDS =========== */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    margin-bottom: 1rem;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
}

.card-body {
    padding: 1.25rem;
}

.card-footer {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: 0 0 var(--border-radius) var(--border-radius) !important;
}

/* Stat Cards */
.stat-card {
    border: none;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    overflow: hidden;
    position: relative;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    opacity: 0.1;
}

.stat-card .card-title {
    color: white;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

.stat-card .card-text {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0;
}

.stat-card i {
    font-size: 2.5rem;
    opacity: 0.2;
    position: absolute;
    bottom: 1rem;
    right: 1rem;
}

/* =========== TABLES =========== */
.table {
    color: var(--dark);
    margin-bottom: 0;
}

.table th {
    font-weight: 600;
    color: var(--gray);
    border-bottom-width: 1px;
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.table td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-top: 1px solid var(--border-color);
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background-color: var(--primary-light);
}

.table tbody tr.selected {
    background-color: rgba(67, 97, 238, 0.1);
}

.table-responsive {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* =========== FORMS =========== */
.form-control,
.form-select {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    color: var(--dark);
    background-color: var(--bg-card);
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
    background-color: var(--bg-card);
    color: var(--dark);
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--dark);
}

.form-check-input:checked {
    background-color: var(--primary);
    border-color: var(--primary);
}

.form-check-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
}

/* Textarea specific */
textarea.form-control {
    min-height: 100px;
    resize: vertical;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.8125rem;
}

/* =========== BUTTONS =========== */
.btn {
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 1rem;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: 1px solid transparent;
}

.btn i {
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: var(--primary);
    color: white;
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
    border-color: var(--primary-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
    background: transparent;
}

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

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

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

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

.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--border-radius-sm);
    border-bottom-left-radius: var(--border-radius-sm);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--border-radius-sm);
    border-bottom-right-radius: var(--border-radius-sm);
}

/* =========== BADGES =========== */
.badge {
    font-weight: 500;
    padding: 0.375rem 0.625rem;
    border-radius: 20px;
    font-size: 0.75rem;
}

.badge.bg-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%) !important;
}

.badge.bg-success {
    background-color: var(--success) !important;
}

.badge.bg-danger {
    background-color: var(--danger) !important;
}

.badge.bg-warning {
    background-color: var(--warning) !important;
    color: var(--dark);
}

.badge.bg-info {
    background-color: var(--info) !important;
}

.badge.bg-secondary {
    background-color: var(--gray) !important;
}

/* =========== ALERTS =========== */
.alert {
    border-radius: var(--border-radius);
    border: none;
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
}

.alert-primary {
    background-color: var(--primary-light);
    color: var(--primary);
}

.alert-success {
    background-color: rgba(76, 201, 240, 0.1);
    color: var(--success);
}

.alert-danger {
    background-color: rgba(247, 37, 133, 0.1);
    color: var(--danger);
}

.alert-warning {
    background-color: rgba(248, 150, 30, 0.1);
    color: var(--warning);
}

/* =========== MODALS =========== */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-card);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem;
}

.modal-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-body {
    padding: 1.25rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
}

/* =========== TOASTS =========== */
.toast-container {
    z-index: 9999;
}

.toast {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.toast-header {
    border-bottom: 1px solid var(--border-color);
}

.toast-body {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* =========== BILL GRID VIEW =========== */
.bill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.bill-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

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

.bill-card.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.bill-card-header {
    background: var(--bg-sidebar);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bill-card-body {
    padding: 1rem;
}

.bill-card-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-sidebar);
}

.bill-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--danger);
}

.bill-zero-amount {
    color: var(--gray);
    opacity: 0.7;
}

/* =========== LOADING STATES =========== */
.loading-spinner {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 3px solid rgba(67, 97, 238, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.skeleton {
    background: linear-gradient(90deg, var(--border-color) 25%, var(--light) 50%, var(--border-color) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--border-radius-sm);
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* =========== PAGINATION =========== */
.pagination {
    gap: 0.25rem;
}

.page-link {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--primary);
    padding: 0.375rem 0.75rem;
    transition: var(--transition);
}

.page-link:hover {
    background-color: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary-dark);
}

.page-item.active .page-link {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: var(--primary);
    color: white;
}

.page-item.disabled .page-link {
    color: var(--gray);
    background-color: var(--bg-sidebar);
    border-color: var(--border-color);
}

/* =========== UTILITY CLASSES =========== */
.cursor-pointer {
    cursor: pointer;
}

.cursor-not-allowed {
    cursor: not-allowed;
}

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

.rounded-sm { border-radius: var(--border-radius-sm) !important; }
.rounded-md { border-radius: var(--border-radius) !important; }
.rounded-lg { border-radius: calc(var(--border-radius) * 1.5) !important; }

.border-light { border-color: var(--border-color) !important; }
.border-primary { border-color: var(--primary) !important; }

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%) !important;
}

.hover-lift:hover {
    transform: translateY(-2px);
    transition: var(--transition);
}

/* =========== CUSTOM SCROLLBAR =========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-sidebar);
    border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* =========== RESPONSIVE DESIGN =========== */
@media (max-width: 1200px) {
    .sidebar {
        width: 220px;
    }
    
    .main-content {
        margin-left: 220px;
    }
    
    .sidebar.collapsed + .main-content {
        margin-left: 60px;
    }
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
        z-index: 1040;
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0 !important;
        padding: 1rem;
    }
    
    .navbar-toggler {
        display: block;
    }
    
    .bill-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .container-fluid {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.375rem 0.75rem;
    }
    
    .bill-grid {
        grid-template-columns: 1fr;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.125rem; }
    h5 { font-size: 1rem; }
}

@media (max-width: 576px) {
    :root {
        --font-size-base: 13px;
    }
    
    .main-content {
        padding: 0.75rem;
    }
    
    .modal-dialog {
        margin: 0.5rem;
    }
    
    .btn-group {
        flex-wrap: wrap;
    }
    
    .btn-group .btn {
        flex: 1 0 auto;
    }
}

/* =========== PRINT STYLES =========== */
@media print {
    .sidebar,
    .navbar,
    .btn,
    .modal,
    .toast-container,
    .no-print {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
        padding: 0 !important;
    }
    
    .card {
        border: none !important;
        box-shadow: none !important;
    }
    
    .table {
        font-size: 12px;
    }
    
    a {
        text-decoration: none !important;
        color: var(--black) !important;
    }
}

/* =========== ANIMATIONS =========== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* =========== CUSTOM COMPONENTS =========== */
/* Search Highlight */
.highlight {
    background-color: rgba(255, 255, 0, 0.3);
    padding: 0.125rem 0.25rem;
    border-radius: 2px;
}

/* Status Indicators */
.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.status-dot.available {
    background-color: var(--success);
    box-shadow: 0 0 0 2px rgba(76, 201, 240, 0.2);
}

.status-dot.sold {
    background-color: var(--danger);
    box-shadow: 0 0 0 2px rgba(247, 37, 133, 0.2);
}

.status-dot.imported {
    background-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

/* Progress Bars */
.progress {
    background-color: var(--bg-sidebar);
    border-radius: 10px;
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
}

/* Tooltips */
.custom-tooltip {
    position: relative;
    display: inline-block;
}

.custom-tooltip .tooltip-text {
    visibility: hidden;
    background-color: var(--dark);
    color: var(--white);
    text-align: center;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    font-size: 0.75rem;
    opacity: 0;
    transition: opacity 0.3s;
}

.custom-tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Empty States */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h4 {
    color: var(--gray);
    margin-bottom: 0.5rem;
}

.empty-state p {
    margin-bottom: 1.5rem;
}

/* Divider */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 2rem 0;
    color: var(--gray);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 1rem;
    font-size: 0.875rem;
}

/* =========== FINAL TOUCHES =========== */
::selection {
    background-color: rgba(67, 97, 238, 0.3);
    color: var(--dark);
}

:-moz-focusring {
    outline: 2px solid var(--primary);
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Print Improvements */
@media print {
    body {
        background: white !important;
        color: black !important;
        font-size: 12pt;
    }
    
    .card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    .table {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}