/* 
 * B2B PO Management System - Main Stylesheet
 * Version: 1.0
 * Date: June 11, 2025
 */

/* ===== ROOT VARIABLES ===== */
:root {
    /* Color Palette */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --info-color: #1abc9c;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Gradients */
    --primary-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --success-gradient: linear-gradient(135deg, var(--success-color), #219a52);
    --warning-gradient: linear-gradient(135deg, var(--warning-color), #d35400);
    --danger-gradient: linear-gradient(135deg, var(--danger-color), #c0392b);
    --purple-gradient: linear-gradient(135deg, #9b59b6, #8e44ad);
    
    /* Shadows */
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    --button-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
    
    /* Border Radius */
    --border-radius-sm: 5px;
    --border-radius: 10px;
    --border-radius-lg: 15px;
    --border-radius-xl: 25px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

/* ===== BASE STYLES ===== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-color);
    color: var(--gray-800);
    line-height: 1.6;
}

a {
    text-decoration: none;
    transition: all var(--transition-speed) ease;
}

a:hover {
    text-decoration: none;
}

/* ===== LAYOUT COMPONENTS ===== */
/* Navbar */
.navbar {
    background: var(--primary-gradient) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 0.75rem 1rem;
}

.navbar-brand {
    font-weight: 700 !important;
    font-size: 1.5rem !important;
    color: white !important;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85) !important;
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: white !important;
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar-dark .navbar-nav .active > .nav-link {
    color: white !important;
    background-color: rgba(255, 255, 255, 0.15);
}

.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.5);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Dropdown menus */
.dropdown-menu {
    border: none;
    box-shadow: var(--card-shadow);
    border-radius: var(--border-radius);
}

.dropdown-item {
    padding: 0.75rem 1rem;
    transition: all var(--transition-speed) ease;
}

.dropdown-item:hover {
    background-color: var(--primary-color);
    color: white;
}

.dropdown-header {
    color: var(--gray-600);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
}

/* ===== COMPONENTS ===== */
/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-speed) ease;
    margin-bottom: 1.5rem;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--hover-shadow);
}

.card-header {
    background-color: var(--primary-color) !important;
    color: white !important;
    border-bottom: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: var(--gray-100);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.25rem;
}

/* Stats Cards */
.stats-card {
    color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-speed) ease;
}

.stats-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--hover-shadow);
}

.stats-card h3 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stats-card p {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 0;
}

.stats-card .icon {
    font-size: 3rem;
    opacity: 0.5;
}

.stats-card a {
    color: white;
    text-decoration: none;
    display: inline-block;
    margin-top: 0.75rem;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.stats-card a:hover {
    text-decoration: underline;
    opacity: 0.9;
}

/* Card Color Variants */
.stats-card.primary {
    background: var(--primary-gradient);
}

.stats-card.success {
    background: var(--success-gradient);
}

.stats-card.warning {
    background: var(--warning-gradient);
}

.stats-card.danger {
    background: var(--danger-gradient);
}

.stats-card.purple {
    background: var(--purple-gradient);
}

/* Main Content */
.main-content {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

/* ===== BUTTONS ===== */
.btn {
    border-radius: var(--border-radius-xl);
    padding: 0.625rem 1.25rem;
    font-weight: 600;
    transition: all var(--transition-speed) ease;
}

.btn-primary {
    background: var(--primary-gradient);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--button-shadow);
}

.btn-success {
    background: var(--success-gradient);
    border: none;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
}

.btn-danger {
    background: var(--danger-gradient);
    border: none;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.btn-outline-primary {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* ===== FORMS ===== */
.form-control {
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-xl);
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
}

.form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.form-select {
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-xl);
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
}

.form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* ===== TABLES ===== */
.table {
    margin-bottom: 0;
}

.table th {
    background: var(--primary-gradient);
    color: white;
    font-weight: 600;
    border: none;
    padding: 1rem;
    vertical-align: middle;
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-200);
}

.table tr:hover {
    background-color: var(--gray-100);
}

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

/* ===== BADGES ===== */
.badge {
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
}

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

.alert-success {
    background-color: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-warning {
    background-color: rgba(243, 156, 18, 0.1);
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background-color: rgba(52, 152, 219, 0.1);
    color: var(--secondary-color);
    border-left: 4px solid var(--secondary-color);
}

/* ===== PAGINATION ===== */
.pagination .page-link {
    border-radius: var(--border-radius);
    margin: 0 0.2rem;
    border: 2px solid var(--gray-200);
    color: var(--primary-color);
}

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

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* ===== UTILITIES ===== */
.text-primary {
    color: var(--primary-color) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.text-warning {
    color: var(--warning-color) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

.text-info {
    color: var(--info-color) !important;
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .stats-card h3 {
        font-size: 2rem;
    }
    
    .table th, .table td {
        padding: 0.75rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

@media (max-width: 576px) {
    .btn {
        padding: 0.5rem 1rem;
    }
    
    .form-control, .form-select {
        padding: 0.625rem 1rem;
    }
    
    .stats-card {
        padding: 1.25rem;
    }
    
    .stats-card h3 {
        font-size: 1.75rem;
    }
    
    .navbar-brand {
        font-size: 1.25rem !important;
    }
}

/* ===== LOADING STATES ===== */
.spinner-border {
    width: 2rem;
    height: 2rem;
}

.loading-spinner {
    text-align: center;
    padding: 2rem;
    color: var(--gray-600);
}

/* ===== FOOTER ===== */
footer {
    background-color: var(--light-color);
    border-top: 1px solid var(--gray-200);
    margin-top: 2rem;
}

/* ===== SEARCH CONTAINER ===== */
.search-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
}

.search-container h2 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.search-input {
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-xl);
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
}

.search-input:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* Input Groups */
.input-group-text {
    background-color: var(--primary-color);
    border: 2px solid var(--primary-color);
    color: white;
    border-radius: var(--border-radius-xl) 0 0 var(--border-radius-xl);
}

.input-group .form-control {
    border-left: none;
    border-radius: 0 var(--border-radius-xl) var(--border-radius-xl) 0;
}

.input-group .btn {
    border-radius: 0 var(--border-radius-xl) var(--border-radius-xl) 0;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn var(--transition-speed) ease;
}

@keyframes slideInUp {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.slide-in-up {
    animation: slideInUp var(--transition-speed) ease;
}

/* ===== CUSTOM COMPONENTS ===== */
.section-title {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* Product/Supplier Cards */
.supplier-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    border-left: 4px solid var(--secondary-color);
}

.supplier-card:hover {
    transform: translateX(5px);
    box-shadow: var(--hover-shadow);
}

.supplier-card h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.supplier-card p {
    margin-bottom: 0.25rem;
    color: var(--gray-600);
}

.supplier-card i.fa-chevron-right {
    color: var(--secondary-color);
    opacity: 0.7;
    transition: all var(--transition-speed) ease;
}

.supplier-card:hover i.fa-chevron-right {
    transform: translateX(5px);
    opacity: 1;
}