/* ============================================================================
   Freedom Engine B2B Platform - Production CSS Stylesheet
   ============================================================================ */

/* ============================================================================
   CSS Reset & Normalize
   ============================================================================ */

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #333333;
    background-color: #f5f7fa;
    overflow-x: hidden;
}

/* ============================================================================
   CSS Variables
   ============================================================================ */

:root {
    /* Brand Colors */
    --primary: #3A9D8C;
    --primary-dark: #2d7d6f;
    --primary-light: #5eb5a3;
    --secondary: #1A2744;
    --accent: #DAA520;
    --accent-light: #e5b840;

    /* Backgrounds */
    --bg-main: #f5f7fa;
    --bg-card: #ffffff;
    --bg-hover: #f0f2f5;
    --bg-active: #e8eaed;

    /* Text */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --text-light: #ffffff;

    /* Borders */
    --border: #e0e0e0;
    --border-light: #f0f0f0;
    --border-dark: #cccccc;

    /* Status Colors */
    --success: #27ae60;
    --error: #e74c3c;
    --warning: #f39c12;
    --info: #3498db;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Z-index */
    --z-base: 1;
    --z-fixed: 100;
    --z-navbar: 200;
    --z-modal: 300;
    --z-toast: 400;
}

/* ============================================================================
   Global Typography
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: 28px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 18px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

p {
    margin-bottom: var(--spacing-md);
}

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

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

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
}

input, select, textarea {
    font-family: inherit;
    font-size: 14px;
}

/* ============================================================================
   Layout - Container
   ============================================================================ */

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================================================
   Navbar - Fixed Top
   ============================================================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background-color: var(--secondary);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: var(--z-navbar);
    padding: 0 var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-light);
    font-size: 16px;
    font-weight: 600;
}

.navbar-logo-icon {
    width: 24px;
    height: 24px;
    background-color: var(--accent);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
    font-weight: bold;
    font-size: 12px;
}

.navbar-title {
    flex: 1;
    text-align: center;
}

.navbar-title h1 {
    margin: 0;
    font-size: 16px;
    color: var(--text-light);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.notification-bell {
    position: relative;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-light);
}

.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background-color: var(--error);
    color: white;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: bold;
    border: 2px solid var(--secondary);
}

.notification-badge.hide {
    display: none;
}

.user-menu {
    position: relative;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
    font-weight: bold;
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 160px;
    margin-top: var(--spacing-sm);
    z-index: var(--z-navbar);
    display: none;
}

.dropdown-menu.active {
    display: block;
}

.dropdown-menu a,
.dropdown-menu button {
    display: block;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-fast);
}

.dropdown-menu a:last-child,
.dropdown-menu button:last-child {
    border-bottom: none;
}

.dropdown-menu a:hover,
.dropdown-menu button:hover {
    background-color: var(--bg-hover);
    text-decoration: none;
}

/* ============================================================================
   Page Layout - Navbar Offset
   ============================================================================ */

body:not(.hide-navbar) {
    padding-top: 50px;
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
    text-decoration: none;
    white-space: nowrap;
    min-height: 36px;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-active);
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #c0392b;
}

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

.btn-success:hover:not(:disabled) {
    background-color: #229954;
}

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

.btn-warning:hover:not(:disabled) {
    background-color: #d68910;
}

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

.btn-info:hover:not(:disabled) {
    background-color: #2980b9;
}

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

.btn-accent:hover:not(:disabled) {
    background-color: var(--accent-light);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 12px;
    min-height: 28px;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 16px;
    min-height: 44px;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid currentColor;
}

.btn-text {
    background-color: transparent;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-text:hover:not(:disabled) {
    background-color: var(--bg-hover);
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
    background-color: var(--bg-card);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: var(--transition-fast);
    border: 1px solid var(--border-light);
}

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

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.card-title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    margin: 0;
    font-size: 12px;
    color: var(--text-secondary);
}

.card-body {
    margin-bottom: var(--spacing-md);
}

.card-body:last-child {
    margin-bottom: 0;
}

.card-footer {
    display: flex;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
}

.card-clickable {
    cursor: pointer;
}

.card-clickable:active {
    transform: scale(0.99);
}

/* ============================================================================
   Forms
   ============================================================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-label.required::after {
    content: ' *';
    color: var(--error);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-primary);
    background-color: var(--bg-card);
    transition: var(--transition-fast);
    min-height: 44px;
    -webkit-appearance: none;
    appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(58, 157, 140, 0.1);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background-color: var(--bg-hover);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.form-input::placeholder {
    color: var(--text-tertiary);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    padding-right: 32px;
}

.form-input[type="checkbox"],
.form-input[type="radio"] {
    width: auto;
    min-height: auto;
    margin-right: var(--spacing-sm);
    cursor: pointer;
}

.form-checkbox,
.form-radio {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-secondary);
}

.form-error {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 12px;
    color: var(--error);
}

.form-group.has-error .form-input,
.form-group.has-error .form-select,
.form-group.has-error .form-textarea {
    border-color: var(--error);
}

/* ============================================================================
   Badges & Status Tags
   ============================================================================ */

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    background-color: var(--bg-hover);
    color: var(--text-primary);
    white-space: nowrap;
}

.badge-open {
    background-color: rgba(52, 152, 219, 0.2);
    color: var(--info);
}

.badge-responding {
    background-color: rgba(243, 156, 18, 0.2);
    color: var(--warning);
}

.badge-matched {
    background-color: rgba(39, 174, 96, 0.2);
    color: var(--success);
}

.badge-completed {
    background-color: rgba(149, 165, 166, 0.2);
    color: #7f8c8d;
}

.badge-cancelled {
    background-color: rgba(231, 76, 60, 0.2);
    color: var(--error);
}

.status-tag {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

/* ============================================================================
   Tables
   ============================================================================ */

.table-wrapper {
    width: 100%;
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-card);
}

.table thead {
    background-color: var(--bg-hover);
    border-bottom: 2px solid var(--border);
}

.table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    color: var(--text-primary);
    text-transform: uppercase;
}

.table td {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
}

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

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

/* ============================================================================
   Tabs
   ============================================================================ */

.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: var(--bg-card);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: var(--z-navbar);
    padding-bottom: env(safe-area-inset-bottom);
}

.tab-bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    flex: 1;
    height: 56px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 10px;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.tab-bar-item:active,
.tab-bar-item.active {
    color: var(--primary);
}

.tab-bar-icon {
    font-size: 24px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tab-bar-label {
    white-space: nowrap;
}

body.has-tab-bar {
    padding-bottom: 56px;
}

body.has-tab-bar.has-notch {
    padding-bottom: calc(56px + env(safe-area-inset-bottom));
}

/* ============================================================================
   Alerts
   ============================================================================ */

.alert {
    padding: var(--spacing-lg);
    border-radius: 6px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    border-left: 4px solid currentColor;
}

.alert-icon {
    flex-shrink: 0;
    font-size: 20px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.alert-content {
    flex: 1;
}

.alert-title {
    margin: 0 0 var(--spacing-xs) 0;
    font-weight: 600;
    font-size: 14px;
}

.alert-message {
    margin: 0;
    font-size: 13px;
}

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

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

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

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

.alert-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: currentColor;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================================================
   Modals
   ============================================================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--spacing-lg);
}

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

.modal {
    background-color: var(--bg-card);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-width: 480px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.modal-title {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-light);
}

.modal-footer .btn {
    flex: 1;
}

/* ============================================================================
   Empty States
   ============================================================================ */

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state-description {
    margin-bottom: var(--spacing-lg);
    font-size: 13px;
}

.empty-state-action {
    margin-top: var(--spacing-lg);
}

/* ============================================================================
   Star Rating
   ============================================================================ */

.star-rating {
    display: flex;
    gap: 2px;
    align-items: center;
}

.star {
    color: #ddd;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.star.filled {
    color: var(--accent);
}

.star-value {
    margin-left: var(--spacing-sm);
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================================================
   Tags & Chips
   ============================================================================ */

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(58, 157, 140, 0.1);
    color: var(--primary);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.tag-close {
    margin-left: var(--spacing-xs);
    cursor: pointer;
}

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

.tag-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* ============================================================================
   Pricing Display
   ============================================================================ */

.price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.price-currency {
    font-size: 14px;
    margin-right: 2px;
}

.price-unit {
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: var(--spacing-sm);
}

.price-trade {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(39, 174, 96, 0.1);
    color: var(--success);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
}

.price-original {
    font-size: 12px;
    color: var(--text-tertiary);
    text-decoration: line-through;
    margin-right: var(--spacing-sm);
}

.price-discount {
    background-color: var(--error);
    color: white;
    padding: 2px var(--spacing-sm);
    border-radius: 2px;
    font-size: 10px;
    font-weight: 600;
}

/* ============================================================================
   Supplier Card
   ============================================================================ */

.supplier-card {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    padding: var(--spacing-lg);
    background-color: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.supplier-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
    font-size: 24px;
    font-weight: bold;
    flex-shrink: 0;
}

.supplier-info {
    flex: 1;
}

.supplier-name {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.supplier-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    font-size: 12px;
    color: var(--text-secondary);
}

.supplier-rating {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.supplier-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
}

.supplier-stat {
    text-align: center;
}

.supplier-stat-value {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
}

.supplier-stat-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* ============================================================================
   Product Card
   ============================================================================ */

.product-card {
    padding: var(--spacing-lg);
    background-color: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.product-card-image {
    width: 100%;
    height: 160px;
    background-color: var(--bg-hover);
    border-radius: 6px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 48px;
}

.product-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.product-card-title {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.product-card-description {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.product-card-price {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.product-card-schedule {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-hover);
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.product-card-footer {
    display: flex;
    gap: var(--spacing-md);
}

.product-card-footer .btn {
    flex: 1;
}

/* ============================================================================
   Demand Card
   ============================================================================ */

.demand-card {
    padding: var(--spacing-lg);
    background-color: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.demand-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.demand-card-title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.demand-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: 13px;
    color: var(--text-secondary);
}

.demand-card-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.demand-card-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-hover);
    border-radius: 6px;
}

.demand-card-stat {
    text-align: center;
}

.demand-card-stat-value {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.demand-card-stat-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* ============================================================================
   Login Page
   ============================================================================ */

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 50px);
    padding: var(--spacing-lg);
}

.login-card {
    max-width: 320px;
    width: 100%;
}

.login-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.login-title h1 {
    margin: 0;
    color: var(--secondary);
}

.login-form {
    margin-bottom: var(--spacing-lg);
}

.login-footer {
    text-align: center;
    font-size: 13px;
}

.login-footer a {
    color: var(--primary);
}

/* ============================================================================
   Register Page
   ============================================================================ */

.register-page {
    padding: var(--spacing-lg) 0;
}

.register-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.register-header h1 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--secondary);
}

.register-header p {
    margin: 0;
    color: var(--text-secondary);
}

.role-selector {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .role-selector {
        grid-template-columns: repeat(2, 1fr);
    }
}

.role-card {
    padding: var(--spacing-2xl);
    background-color: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.role-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.role-card.selected {
    border-color: var(--primary);
    background-color: rgba(58, 157, 140, 0.05);
}

.role-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.role-name {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 18px;
    font-weight: 600;
}

.role-description {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================================================
   Pagination
   ============================================================================ */

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-2xl) 0;
}

.pagination a,
.pagination span {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.pagination a:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.pagination .active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.pagination .disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================================================
   Search Bar
   ============================================================================ */

.search-bar {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-sm) 36px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    background-color: var(--bg-card);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-voice-btn {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-tertiary);
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-voice-btn:active {
    color: var(--primary);
}

/* ============================================================================
   Filter Bar
   ============================================================================ */

.filter-bar {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

.filter-chip {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-fast);
}

.filter-chip:active,
.filter-chip.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ============================================================================
   Loading Spinner
   ============================================================================ */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading.lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

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

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* ============================================================================
   Toast Notifications
   ============================================================================ */

.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 280px;
    animation: toastSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--info);
}

.toast-icon {
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast.success .toast-icon {
    color: var(--success);
}

.toast.error .toast-icon {
    color: var(--error);
}

.toast.warning .toast-icon {
    color: var(--warning);
}

.toast.info .toast-icon {
    color: var(--info);
}

.toast-message {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
}

.toast-close {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-tertiary);
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes toastSlideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================================================
   Responsive Design
   ============================================================================ */

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-2xl);
    }

    h1 { font-size: 32px; }
    h2 { font-size: 28px; }
    h3 { font-size: 24px; }

    .btn {
        min-height: 40px;
    }

    .btn-lg {
        min-height: 48px;
    }

    .form-input,
    .form-select,
    .form-textarea {
        min-height: 40px;
    }

    .tab-bar {
        display: none;
    }

    body.has-tab-bar {
        padding-bottom: 0;
    }

    .modal-overlay {
        padding: var(--spacing-2xl);
    }

    .modal {
        max-width: 600px;
    }

    .supplier-card {
        flex-direction: row;
    }

    .demand-card-stats {
        grid-template-columns: repeat(4, 1fr);
    }

    .search-bar {
        max-width: 400px;
    }

    .table-wrapper {
        overflow-x: visible;
    }

    .role-selector {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
    }

    .demand-card-stats {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* ============================================================================
   Utility Classes
   ============================================================================ */

.hidden {
    display: none !important;
}

.invisible {
    visibility: hidden;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

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

.text-primary {
    color: var(--text-primary);
}

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

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

.text-error {
    color: var(--error);
}

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

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

.font-bold {
    font-weight: 600;
}

.font-normal {
    font-weight: 400;
}

.margin-0 {
    margin: 0;
}

.margin-top-sm { margin-top: var(--spacing-sm); }
.margin-top-md { margin-top: var(--spacing-md); }
.margin-top-lg { margin-top: var(--spacing-lg); }

.margin-bottom-sm { margin-bottom: var(--spacing-sm); }
.margin-bottom-md { margin-bottom: var(--spacing-md); }
.margin-bottom-lg { margin-bottom: var(--spacing-lg); }

.padding-sm { padding: var(--spacing-sm); }
.padding-md { padding: var(--spacing-md); }
.padding-lg { padding: var(--spacing-lg); }

.flex {
    display: flex;
}

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

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

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

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.overflow-hidden {
    overflow: hidden;
}

.truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.opacity-50 {
    opacity: 0.5;
}

.opacity-75 {
    opacity: 0.75;
}

/* ============================================================================
   Accessibility
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-main: #1a1a1a;
        --bg-card: #2d2d2d;
        --bg-hover: #3a3a3a;
        --bg-active: #454545;
        --text-primary: #f5f5f5;
        --text-secondary: #b0b0b0;
        --text-tertiary: #808080;
        --border: #404040;
        --border-light: #2d2d2d;
    }

    .navbar {
        background-color: #0f1419;
    }

    .form-select {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23f5f5f5' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    }
}