/* 
PICMS Modern Design System
Sophisticated, structured, data-focused design
Color Palette: Grey, White, Black theme
*/

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

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: #FFFFFF;
    color: #343A40;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   COLOR VARIABLES
========================================== */
:root {
    /* Primary Colors */
    --color-white: #FFFFFF;
    --color-black: #343A40;
    --color-grey-light: #DEE2E6;
    --color-grey-medium: #CED4DA;
    --color-grey-dark: #6C757D;
    --color-background-alt: #F8F9FA;
    
    /* Status Colors */
    --color-success: #28A745;
    --color-warning: #FFC107;
    --color-danger: #DC3545;
    --color-info: #17A2B8;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* 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 25px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Layout */
    --sidebar-width: 260px;
    --topbar-height: 60px;
}

/* ==========================================
   LAYOUT STRUCTURE
========================================== */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Top Navigation Bar */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: var(--color-black);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
    text-decoration: none;
    color: var(--color-white);
}

.topbar-brand:hover {
    color: var(--color-white);
    text-decoration: none;
}

.topbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
    justify-content: center;
}

.topbar-nav-link {
    color: var(--color-white);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all 0.2s ease;
    opacity: 0.8;
}

.topbar-nav-link:hover,
.topbar-nav-link.active {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    text-decoration: none;
}

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

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.logout-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.logout-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Main Content Area */
.main-content {
    margin-top: var(--topbar-height);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

/* ==========================================
   GRID SYSTEM
========================================== */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-5 { grid-template-columns: repeat(5, 1fr); }
.grid-cols-6 { grid-template-columns: repeat(6, 1fr); }

.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-6 { grid-column: span 6; }

/* Auto-responsive grid */
.grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-auto-fill {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* ==========================================
   CARDS & PANELS
========================================== */
.card {
    background: var(--color-white);
    border: 1px solid var(--color-grey-medium);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

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

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

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-black);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-grey-dark);
    margin-top: var(--spacing-xs);
}

.card-body {
    padding: 0;
}

.card-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-grey-medium);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Panel Variations */
.panel {
    background: var(--color-grey-light);
    border: 1px solid var(--color-grey-medium);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

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

/* ==========================================
   BUTTONS
========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid var(--color-grey-dark);
    outline-offset: 2px;
}

/* Primary Button (Black) */
.btn-primary {
    background: var(--color-black);
    color: var(--color-white);
    border-color: var(--color-black);
}

.btn-primary:hover {
    background: #2c3237;
    border-color: #2c3237;
    color: var(--color-white);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Secondary Button (White with Black Border) */
.btn-secondary {
    background: var(--color-white);
    color: var(--color-black);
    border-color: var(--color-black);
}

.btn-secondary:hover {
    background: var(--color-background-alt);
    color: var(--color-black);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Tertiary Button (Grey) */
.btn-tertiary {
    background: var(--color-grey-light);
    color: var(--color-black);
    border-color: var(--color-grey-medium);
}

.btn-tertiary:hover {
    background: var(--color-grey-medium);
    color: var(--color-black);
    text-decoration: none;
    transform: translateY(-1px);
}

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* Icon Buttons */
.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-sm);
}

.btn-icon-sm {
    width: 32px;
    height: 32px;
}

/* Status Buttons */
.btn-success {
    background: var(--color-success);
    color: var(--color-white);
    border-color: var(--color-success);
}

.btn-success:hover {
    background: #218838;
    border-color: #218838;
    color: var(--color-white);
    text-decoration: none;
}

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

.btn-warning:hover {
    background: #e0a800;
    border-color: #e0a800;
    color: var(--color-black);
    text-decoration: none;
}

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

.btn-danger:hover {
    background: #c82333;
    border-color: #c82333;
    color: var(--color-white);
    text-decoration: none;
}

/* ==========================================
   FORMS
========================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

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

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

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-black);
    background: var(--color-white);
    border: 1px solid var(--color-grey-medium);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-grey-dark);
    box-shadow: 0 0 0 2px rgba(108, 117, 125, 0.2);
}

.form-control::placeholder {
    color: var(--color-grey-dark);
    opacity: 0.7;
}

/* Form Control Sizes */
.form-control-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.form-control-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
}

/* Select Dropdown */
.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    background-size: 16px 12px;
    padding-right: var(--spacing-xl);
}

/* Textarea */
.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* File Upload */
.file-upload {
    border: 2px dashed var(--color-grey-medium);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--color-background-alt);
}

.file-upload:hover {
    border-color: var(--color-grey-dark);
    background: var(--color-white);
}

.file-upload-icon {
    font-size: var(--font-size-3xl);
    color: var(--color-grey-dark);
    margin-bottom: var(--spacing-sm);
}

.file-upload-text {
    font-size: var(--font-size-base);
    color: var(--color-black);
    font-weight: 500;
}

.file-upload-subtext {
    font-size: var(--font-size-sm);
    color: var(--color-grey-dark);
    margin-top: var(--spacing-xs);
}

/* ==========================================
   DATA TABLES
========================================== */
.table-container {
    background: var(--color-white);
    border: 1px solid var(--color-grey-medium);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.table th {
    background: var(--color-grey-light);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-black);
    border-bottom: 1px solid var(--color-grey-medium);
    white-space: nowrap;
}

.table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-grey-medium);
    vertical-align: top;
}

.table tbody tr:nth-child(even) {
    background: var(--color-background-alt);
}

.table tbody tr:hover {
    background: #f1f3f4;
}

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

/* Sortable Table Headers */
.table th.sortable {
    cursor: pointer;
    user-select: none;
    position: relative;
}

.table th.sortable:hover {
    background: var(--color-grey-medium);
}

.table th.sortable::after {
    content: '';
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border: 4px solid transparent;
    border-bottom-color: var(--color-grey-dark);
    opacity: 0.3;
}

.table th.sortable.asc::after {
    border-bottom-color: transparent;
    border-top-color: var(--color-black);
    opacity: 1;
}

.table th.sortable.desc::after {
    border-bottom-color: var(--color-black);
    opacity: 1;
}

/* ==========================================
   STATUS INDICATORS & BADGES
========================================== */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    white-space: nowrap;
}

.status-success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(40, 167, 69, 0.2);
}

.status-warning {
    background: rgba(255, 193, 7, 0.1);
    color: #b45309;
    border: 1px solid rgba(255, 193, 7, 0.2);
}

.status-danger {
    background: rgba(220, 53, 69, 0.1);
    color: var(--color-danger);
    border: 1px solid rgba(220, 53, 69, 0.2);
}

.status-info {
    background: rgba(23, 162, 184, 0.1);
    color: var(--color-info);
    border: 1px solid rgba(23, 162, 184, 0.2);
}

.status-neutral {
    background: rgba(108, 117, 125, 0.1);
    color: var(--color-grey-dark);
    border: 1px solid rgba(108, 117, 125, 0.2);
}

/* ==========================================
   STATISTICS & WIDGETS
========================================== */
.stat-card {
    background: var(--color-white);
    border: 1px solid var(--color-grey-medium);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

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

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-black);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-grey-dark);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.stat-change {
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.stat-change.positive {
    color: var(--color-success);
}

.stat-change.negative {
    color: var(--color-danger);
}

.stat-change.neutral {
    color: var(--color-grey-dark);
}

/* Progress Bars */
.progress {
    background: var(--color-grey-light);
    border-radius: var(--radius-lg);
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--color-black);
    border-radius: var(--radius-lg);
    transition: width 0.3s ease;
}

.progress-bar.success {
    background: var(--color-success);
}

.progress-bar.warning {
    background: var(--color-warning);
}

.progress-bar.danger {
    background: var(--color-danger);
}

/* ==========================================
   INTELLIGENT FEATURES STYLING
========================================== */
.ai-highlight,
.intelligent-highlight {
    position: relative;
}

.ai-highlight::before,
.intelligent-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, rgba(108, 117, 125, 0.1), rgba(108, 117, 125, 0.05));
    border-radius: var(--radius-md);
    pointer-events: none;
}

.ai-badge,
.intelligent-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-black);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.ai-suggestion,
.intelligent-suggestion {
    background: var(--color-background-alt);
    border: 1px solid var(--color-grey-medium);
    border-left: 3px solid var(--color-grey-dark);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.ai-suggestion-header,
.intelligent-suggestion-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

/* ==========================================
   MODAL DIALOGS
========================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.2s ease;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

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

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-black);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--color-grey-dark);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--color-grey-light);
    color: var(--color-black);
}

.modal-body {
    padding: var(--spacing-lg);
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-grey-medium);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* ==========================================
   LOADING STATES
========================================== */
.loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-grey-dark);
    font-size: var(--font-size-sm);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-grey-light);
    border-top-color: var(--color-grey-dark);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-lg {
    width: 24px;
    height: 24px;
}

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

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

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

.skeleton-text {
    height: 1rem;
    margin-bottom: var(--spacing-sm);
}

.skeleton-text:last-child {
    margin-bottom: 0;
    width: 60%;
}

/* ==========================================
   UTILITIES
========================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }

.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-black { color: var(--color-black); }
.text-grey-dark { color: var(--color-grey-dark); }
.text-grey-medium { color: var(--color-grey-medium); }
.text-white { color: var(--color-white); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }
.mb-6 { margin-bottom: var(--spacing-xxl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }
.mt-6 { margin-top: var(--spacing-xxl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }
.gap-5 { gap: var(--spacing-xl); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.inline-flex { display: inline-flex; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* ==========================================
   RESPONSIVE DESIGN
========================================== */
@media (max-width: 1024px) {
    .main-content {
        padding: var(--spacing-lg);
    }
    
    .grid-cols-6 { grid-template-columns: repeat(3, 1fr); }
    .grid-cols-5 { grid-template-columns: repeat(3, 1fr); }
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    :root {
        --topbar-height: 56px;
    }
    
    .topbar {
        padding: 0 var(--spacing-md);
    }
    
    .topbar-nav {
        display: none;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .grid-cols-6,
    .grid-cols-5,
    .grid-cols-4,
    .grid-cols-3,
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .stat-number {
        font-size: var(--font-size-2xl);
    }
    
    .modal {
        margin: var(--spacing-md);
    }
    
    .modal-body {
        max-height: 50vh;
    }
}

@media (max-width: 480px) {
    .topbar-brand {
        font-size: var(--font-size-base);
    }
    
    .main-content {
        padding: var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-sm);
    }
    
    .btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
}

/* ==========================================
   LOADING STATES & SKELETON LOADERS
========================================== */

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-grey-light);
    border-top-color: var(--color-info);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-spinner-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

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

/* Loading Container */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    gap: 1rem;
}

.loading-text {
    color: var(--color-grey-dark);
    font-size: var(--font-size-sm);
}

/* Skeleton Loader */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-background-alt) 25%,
        var(--color-grey-light) 50%,
        var(--color-background-alt) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

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

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-text-sm {
    height: 0.75rem;
    margin-bottom: 0.25rem;
}

.skeleton-title {
    height: 1.25rem;
    width: 70%;
    margin-bottom: 0.5rem;
}

.skeleton-badge {
    height: 1.5rem;
    width: 4rem;
    border-radius: 12px;
}

/* Widget Loading State */
.widget-loading {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 0;
}

.widget-loading-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-grey-light);
}

.widget-loading-item:last-child {
    border-bottom: none;
}

.skeleton-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 0.5rem;
}

.skeleton-content {
    flex: 1;
}

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    gap: 1rem;
}

.error-icon {
    font-size: 3rem;
}

.error-message {
    color: var(--color-grey-dark);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.error-title {
    color: var(--color-danger);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Retry Button */
.btn-retry {
    background-color: var(--color-info);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color 0.2s;
}

.btn-retry:hover {
    background-color: #138496;
}

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

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: 8px;
}

/* Progress Bar */
.progress-line {
    width: 100%;
    height: 4px;
    background-color: var(--color-grey-light);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.progress-line-bar {
    height: 100%;
    background-color: var(--color-info);
    border-radius: 2px;
    animation: progress 1.5s infinite;
}

@keyframes progress {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Fade In Animation */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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