/* =================================
   CSS Reset & Base Styles
   ================================= */

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

html, body {
    height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--primary-gradient);
    background-size: 400% 400%;
    background-attachment: fixed;
    animation: gradientShift 15s ease infinite;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* =================================
   Color Variables
   ================================= */

:root {
    /* Primary colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #f5576c 75%, #667eea 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    
    /* Secondary colors */
    --secondary-gradient: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --error-color: #f56565;
    
    /* Light theme colors */
    --white: #ffffff;
    --gray-50: #f7fafc;
    --gray-100: #edf2f7;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e0;
    --gray-400: #a0aec0;
    --gray-500: #718096;
    --gray-600: #4a5568;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    --gray-900: #171923;
    
    /* Theme variables */
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --border-color: var(--gray-200);
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    
    /* 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);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark theme variables */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --shadow-color: rgba(0, 0, 0, 0.5);
    
    /* Override background gradient for dark theme */
    --primary-gradient: linear-gradient(135deg, #2d3748 0%, #4a5568 25%, #805ad5 50%, #553c9a 75%, #2d3748 100%);
    
    /* Darker stat card backgrounds for dark theme */
    --stat-card-primary: linear-gradient(135deg, #4c51bf 0%, #667eea 100%);
    --stat-card-success: linear-gradient(135deg, #38a169 0%, #48bb78 100%);
    --stat-card-warning: linear-gradient(135deg, #d69e2e 0%, #ed8936 100%);
}

/* Light theme stat card variables */
[data-theme="light"] {
    --stat-card-primary: var(--primary-gradient);
    --stat-card-success: linear-gradient(135deg, #68d391 0%, #38b2ac 100%);
    --stat-card-warning: linear-gradient(135deg, #fbb6ce 0%, #ed8936 100%);
}

/* =================================
   Header Styles
   ================================= */

.header {
    background: var(--bg-primary);
    box-shadow: 0 4px 6px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: nowrap; /* Убираем перенос для предотвращения переполнения */
    gap: var(--spacing-sm);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

    .main-nav {
        display: flex;
        gap: var(--spacing-xs);
        flex-wrap: nowrap; /* Запрещаем перенос элементов */
    }
    
    /* Show nav on desktop */
    @media (min-width: 769px) {
        .mobile-menu-btn {
            display: none !important;
        }
    }

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-normal);
    position: relative;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: var(--bg-secondary);
    transform: translateY(-1px);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 50%;
}

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

.user-name {
    font-weight: 500;
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.logout-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--error-color);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
}

.logout-btn:hover {
    color: var(--error-color);
    background: rgba(245, 101, 101, 0.1);
    transform: translateY(-1px);
}

/* =================================
   Main Content
   ================================= */

.main-content {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* =================================
   Page Container
   ================================= */

.page-container {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: 0 20px 25px var(--shadow-color);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.page-header {
    background: var(--primary-gradient);
    color: var(--white);
    padding: var(--spacing-2xl);
    text-align: center;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    opacity: 0.9;
    font-size: 1.1rem;
}

.page-content {
    padding: var(--spacing-2xl);
}

/* =================================
   Grid & Layout
   ================================= */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

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

.full-width {
    grid-column: 1 / -1;
}

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

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 15px var(--shadow-color);
    transition: all var(--transition-normal), background-color var(--transition-normal);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px var(--shadow-color);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-content {
    padding: var(--spacing-lg);
}

/* Stat Cards */
.stat-card {
    background: var(--secondary-gradient);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-card.primary {
    background: var(--stat-card-primary, var(--primary-gradient));
    color: var(--white);
}

.stat-card.success {
    background: var(--stat-card-success, linear-gradient(135deg, #68d391 0%, #38b2ac 100%));
    color: var(--white);
}

.stat-card.warning {
    background: var(--stat-card-warning, linear-gradient(135deg, #fbb6ce 0%, #ed8936 100%));
    color: var(--white);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.stat-label {
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
}

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

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* File Input */
.file-input-wrapper {
    position: relative;
    display: block;
    width: 100%;
}

.file-input {
    display: none;
}

.file-input-label {
    display: block;
    padding: var(--spacing-xl);
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-md);
    text-align: center;
    color: var(--gray-500);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--gray-50);
}

.file-input-label:hover,
.file-input-label.file-selected {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-200);
    transform: translateY(-1px);
}

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

.btn-success:hover:not(:disabled) {
    background: #38a169;
    transform: translateY(-2px);
}

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

.btn-warning:hover:not(:disabled) {
    background: #dd6b20;
    transform: translateY(-2px);
}

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

.btn-danger:hover:not(:disabled) {
    background: #e53e3e;
    transform: translateY(-2px);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.1rem;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
}

.btn-full {
    width: 100%;
}

/* =================================
   Alerts & Messages
   ================================= */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.alert-success {
    background: #f0fff4;
    color: #22543d;
    border: 1px solid #9ae6b4;
}

.alert-error {
    background: #fed7d7;
    color: #742a2a;
    border: 1px solid #feb2b2;
}

.alert-warning {
    background: #fefcbf;
    color: #744210;
    border: 1px solid #faf089;
}

.alert-info {
    background: #ebf8ff;
    color: #2a4365;
    border: 1px solid #90cdf4;
}

/* =================================
   Loading & Utilities
   ================================= */

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-2xl);
    color: var(--primary-color);
    font-weight: 600;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-200);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

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

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

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

/* =================================
   Footer
   ================================= */

.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-normal);
}

.footer-link:hover {
    color: var(--primary-color);
}

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

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .main-nav {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .user-info {
        order: 2;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .page-header {
        padding: var(--spacing-lg);
    }
    
    .page-content {
        padding: var(--spacing-lg);
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .main-nav {
        flex-direction: column;
        width: 100%;
    }
    
    .nav-link {
        justify-content: center;
    }
}

/* =================================
   Enhanced Mobile Responsive Design
   ================================= */

/* Large screens - compact navigation with text */
@media (min-width: 1025px) and (max-width: 1400px) {
    .header-content {
        padding: var(--spacing-md);
        max-width: 1400px;
    }
    
    .main-nav {
        gap: var(--spacing-xs);
    }
    
    .nav-text {
        display: inline;
    }
    
    .nav-link {
        justify-content: flex-start;
        gap: var(--spacing-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.9rem;
        white-space: nowrap;
    }
    
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .user-info {
        gap: var(--spacing-sm);
    }
}

/* Very large screens - full navigation */
@media (min-width: 1401px) {
    .header-content {
        padding: var(--spacing-md) var(--spacing-lg);
        max-width: 1800px;
    }
    
    .main-nav {
        gap: var(--spacing-md);
    }
    
    .nav-text {
        display: inline;
    }
    
    .nav-link {
        justify-content: flex-start;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
        white-space: nowrap;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
}

/* Medium screens - compact navigation */
@media (max-width: 1024px) and (min-width: 769px) {
    .header-content {
        padding: var(--spacing-md);
    }
    
    .main-nav {
        gap: var(--spacing-xs);
    }
    
    .nav-link {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
        min-width: 44px;
        justify-content: center;
        position: relative;
    }
    
    .nav-text {
        display: none;
    }
    
    /* Tooltip for medium screens */
    .nav-link:hover::after {
        content: attr(title);
        position: absolute;
        bottom: -35px;
        left: 50%;
        transform: translateX(-50%);
        background: var(--bg-primary);
        color: var(--text-primary);
        padding: var(--spacing-xs) var(--spacing-sm);
        border-radius: var(--radius-sm);
        font-size: 0.8rem;
        white-space: nowrap;
        box-shadow: var(--shadow-md);
        z-index: 1000;
        border: 1px solid var(--border-color);
    }
}

/* Tablets (medium screens) */
@media (max-width: 1024px) {
    .header-content {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .charts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .controls-section {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .data-table {
        min-width: 600px;
    }
}

/* Mobile landscape (small tablets) */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }
    
    .header {
        position: sticky;
        top: 0;
        z-index: 1000;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
    }
    
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .mobile-menu-btn {
        display: flex;
        order: 3;
    }
    
    .main-nav {
        position: fixed;
        top: 0;
        right: -300px;
        width: 280px;
        height: 100vh;
        background: var(--bg-primary);
        border-left: 1px solid var(--border-color);
        box-shadow: var(--shadow-xl);
        padding: var(--spacing-xl) var(--spacing-lg);
        display: flex !important;
        flex-direction: column;
        gap: var(--spacing-md);
        z-index: 1000;
        transition: right var(--transition-normal);
        overflow-y: auto;
    }
    
    .main-nav.active {
        right: 0;
    }
    
    .nav-link {
        padding: var(--spacing-md);
        flex-direction: row;
        gap: var(--spacing-md);
        font-size: 1rem;
        width: 100%;
        text-align: left;
        border-radius: var(--radius-md);
        border-bottom: 1px solid var(--border-color);
        justify-content: flex-start;
    }
    
    .nav-text {
        display: inline !important;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-link i {
        font-size: 1.2rem;
        width: 24px;
    }
    
    .nav-text {
        flex: 1;
    }
    
    .user-info {
        position: fixed;
        bottom: 0;
        right: -300px;
        width: 280px;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border-color);
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-sm);
        z-index: 1000;
        transition: right var(--transition-normal);
    }
    
    .main-nav.active ~ .user-info,
    .user-info.active {
        right: 0;
    }
    
    .user-name {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
        order: 2;
    }
    
    .theme-toggle-btn {
        width: 36px;
        height: 36px;
        order: 1;
    }
    
    .logout-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
        order: 3;
    }
    
    .main-content {
        padding: var(--spacing-sm);
    }
    
    .page-header {
        padding: var(--spacing-md);
        text-align: center;
    }
    
    .page-header h1 {
        font-size: 1.5rem;
    }
    
    .page-content {
        padding: var(--spacing-md);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .stat-card {
        padding: var(--spacing-md);
        text-align: center;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .chart-container {
        padding: var(--spacing-md);
    }
    
    .chart-title {
        font-size: 1rem;
        margin-bottom: var(--spacing-md);
    }
    
    .chart-canvas {
        height: 250px;
    }
    
    .controls {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .control-group {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .form-select {
        width: 100%;
    }
    
    .card {
        margin-bottom: var(--spacing-md);
    }
    
    .card-header {
        padding: var(--spacing-md);
    }
    
    .card-content {
        padding: var(--spacing-md);
    }
    
    .card-title {
        font-size: 1.1rem;
    }
    
    .controls-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: var(--spacing-sm);
    }
    
    .data-table {
        min-width: 600px;
        font-size: 0.85rem;
    }
    
    .data-table th,
    .data-table td {
        padding: var(--spacing-sm);
    }
    
    .btn {
        font-size: 0.9rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .btn-full {
        width: 100%;
        margin: var(--spacing-xs) 0;
    }
    
    .form-group {
        margin-bottom: var(--spacing-md);
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: var(--spacing-md);
    }
    
    .footer {
        padding: var(--spacing-md);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* Mobile portrait (phones) */
@media (max-width: 480px) {
    :root {
        --spacing-xs: 0.2rem;
        --spacing-sm: 0.4rem;
        --spacing-md: 0.8rem;
        --spacing-lg: 1.2rem;
        --spacing-xl: 1.6rem;
        --spacing-2xl: 2.4rem;
    }
    
    body {
        font-size: 14px;
        line-height: 1.4;
    }
    
    .header-content {
        padding: var(--spacing-sm);
    }
    
    .logo h1 {
        font-size: 1.1rem;
    }
    
    .main-nav {
        flex-direction: row;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .main-nav::-webkit-scrollbar {
        display: none;
    }
    
    .nav-link {
        flex-direction: column;
        min-width: 70px;
        font-size: 0.7rem;
        padding: var(--spacing-xs);
    }
    
    .user-info {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .user-name {
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        max-width: 200px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    
    .theme-toggle-btn,
    .logout-btn {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
    
    .logout-btn {
        width: auto;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .main-content {
        padding: var(--spacing-xs);
    }
    
    .page-header {
        padding: var(--spacing-sm);
    }
    
    .page-header h1 {
        font-size: 1.3rem;
    }
    
    .page-header p {
        font-size: 0.85rem;
    }
    
    .page-content {
        padding: var(--spacing-sm);
    }
    
    .stats-grid {
        gap: var(--spacing-xs);
    }
    
    .stat-card {
        padding: var(--spacing-sm);
    }
    
    .stat-number {
        font-size: 1.3rem;
    }
    
    .stat-label {
        font-size: 0.8rem;
    }
    
    .charts-grid {
        gap: var(--spacing-sm);
    }
    
    .chart-container {
        padding: var(--spacing-sm);
    }
    
    .chart-title {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .chart-canvas {
        height: 200px;
    }
    
    .controls {
        gap: var(--spacing-sm);
    }
    
    .control-group label {
        font-size: 0.85rem;
    }
    
    .card {
        margin-bottom: var(--spacing-sm);
    }
    
    .card-header,
    .card-content {
        padding: var(--spacing-sm);
    }
    
    .card-title {
        font-size: 1rem;
    }
    
    .table-container {
        padding: var(--spacing-xs);
    }
    
    .data-table {
        font-size: 0.8rem;
    }
    
    .data-table th,
    .data-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .btn {
        font-size: 0.85rem;
        padding: var(--spacing-sm);
    }
    
    .btn-sm {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .form-group {
        margin-bottom: var(--spacing-sm);
    }
    
    .form-label {
        font-size: 0.85rem;
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: var(--spacing-sm);
    }
    
    .badge {
        font-size: 0.65rem;
        padding: 2px var(--spacing-xs);
    }
    
    .alert {
        padding: var(--spacing-sm);
        font-size: 0.85rem;
    }
    
    .loading {
        padding: var(--spacing-md);
        font-size: 0.9rem;
    }
    
    .spinner {
        width: 16px;
        height: 16px;
    }
    
    /* Mobile-specific utilities */
    .mobile-hidden {
        display: none !important;
    }
    
    .mobile-only {
        display: block !important;
    }
}

/* Extra small devices */
@media (max-width: 360px) {
    .header-content {
        padding: var(--spacing-xs);
    }
    
    .logo h1 {
        font-size: 1rem;
    }
    
    .nav-link {
        min-width: 60px;
        font-size: 0.65rem;
    }
    
    .user-name {
        max-width: 150px;
    }
    
    .main-content,
    .page-header,
    .page-content {
        padding: var(--spacing-xs);
    }
    
    .stat-number {
        font-size: 1.1rem;
    }
    
    .chart-canvas {
        height: 180px;
    }
    
    .card-header,
    .card-content {
        padding: var(--spacing-xs);
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .nav-link,
    .theme-toggle-btn,
    .logout-btn {
        min-height: 44px; /* Apple's recommended touch target size */
        min-width: 44px;
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        min-height: 44px;
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Landscape orientation on mobile */
@media screen and (orientation: landscape) and (max-height: 500px) {
    .header {
        position: relative;
    }
    
    .main-nav {
        flex-direction: row;
        justify-content: space-around;
    }
    
    .nav-link {
        flex-direction: row;
        gap: var(--spacing-xs);
    }
    
    .user-info {
        flex-direction: row;
    }
}

/* Dark theme mobile adjustments */
@media (max-width: 768px) {
    [data-theme="dark"] .nav-link {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
    }
    
    [data-theme="dark"] .main-nav {
        background: var(--bg-primary);
    }
}

/* =================================
   Icons (Simple CSS icons)
   ================================= */

.icon-home::before {
    content: "🏠";
    margin-right: var(--spacing-xs);
}

.icon-settings::before {
    content: "⚙️";
    margin-right: var(--spacing-xs);
}

.icon-chart::before {
    content: "📊";
    margin-right: var(--spacing-xs);
}

.icon-users::before {
    content: "👥";
    margin-right: var(--spacing-xs);
}

.icon-news::before {
    content: "📰";
    margin-right: var(--spacing-xs);
}

.icon-logout::before {
    content: "🚪";
    margin-right: var(--spacing-xs);
}

/* =================================
   Theme Toggle Button
   ================================= */

.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 1.2rem;
    color: var(--text-primary);
}

.theme-toggle-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.icon-theme::before {
    content: '🌙';
}

[data-theme="light"] .icon-theme::before {
    content: '☀️';
}

/* =================================
   Mobile Menu Styles
   ================================= */

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
    z-index: 1001;
}

/* Show mobile menu button on mobile devices */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
    margin: 2px 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.mobile-overlay.active {
    display: block;
    opacity: 1;
}

/* =================================
   Main Content Styles
   ================================= */

/* Dark theme mobile adjustments */
@media (max-width: 768px) {
    [data-theme="dark"] .nav-link {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
    }
    
    [data-theme="dark"] .main-nav {
        background: var(--bg-primary);
    }
}

/* =================================
   Mobile Table Enhancements
   ================================= */

/* Better table styling for mobile */
@media (max-width: 768px) {
    .table-container {
        padding: 0;
        overflow: visible;
        box-shadow: none;
        background: transparent;
        border-radius: 0;
    }
    
    .data-table {
        display: none; /* Hide regular table on mobile */
    }
    
    /* Mobile card-style table replacement */
    .mobile-table-cards {
        display: block;
    }
    
    .table-card {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-normal);
    }
    
    .table-card:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-1px);
    }
    
    .table-card:last-child {
        margin-bottom: 0;
    }
    
    .card-field {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        padding: var(--spacing-xs) 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .card-field:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }
    
    .card-field:first-child {
        padding-top: 0;
    }
    
    .field-label {
        font-weight: 600;
        color: var(--text-secondary);
        font-size: 0.85rem;
        flex: 0 0 40%;
        padding-right: var(--spacing-sm);
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
    
    .field-value {
        color: var(--text-primary);
        font-size: 0.9rem;
        flex: 1;
        text-align: right;
        word-break: break-word;
    }
    
    .field-value .badge {
        font-size: 0.75rem;
        padding: 2px var(--spacing-xs);
    }
    
    .field-value .btn {
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        margin: 2px;
    }
    
    /* Special styling for action buttons in mobile cards */
    .card-actions {
        margin-top: var(--spacing-sm);
        padding-top: var(--spacing-sm);
        border-top: 1px solid var(--border-color);
        display: flex;
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: flex-end;
    }
    
    .card-actions .btn {
        flex: 1;
        min-width: 80px;
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    /* Hide desktop table, show mobile cards */
    .desktop-only {
        display: none !important;
    }
    
    .mobile-only {
        display: block !important;
    }
}

/* Extra small mobile devices */
@media (max-width: 480px) {
    .table-card {
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }
    
    .field-label {
        font-size: 0.8rem;
        flex: 0 0 45%;
    }
    
    .field-value {
        font-size: 0.85rem;
    }
    
    .card-actions {
        margin-top: var(--spacing-xs);
        padding-top: var(--spacing-xs);
    }
    
    .card-actions .btn {
        font-size: 0.75rem;
        padding: var(--spacing-xs);
        min-width: 70px;
    }
}

/* =================================
   Sticky Elements for Mobile
   ================================= */

@media (max-width: 768px) {
    /* Sticky header for better navigation */
    .header {
        position: sticky;
        top: 0;
        z-index: 100;
    }
    
    /* Sticky controls for charts */
    .controls.sticky {
        position: sticky;
        top: 70px;
        z-index: 50;
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        margin-bottom: var(--spacing-lg);
    }
    
    /* Floating action button for mobile */
    .fab {
        position: fixed;
        bottom: 20px;
        right: 20px;
        width: 56px;
        height: 56px;
        border-radius: 50%;
        background: var(--primary-gradient);
        color: var(--white);
        border: none;
        box-shadow: var(--shadow-lg);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        cursor: pointer;
        transition: all var(--transition-normal);
        z-index: 1000;
    }
    
    .fab:hover {
        transform: scale(1.1);
        box-shadow: var(--shadow-xl);
    }
    
    .fab.hidden {
        transform: translateY(100px);
        opacity: 0;
    }
}

/* =================================
   Print Styles for Mobile
   ================================= */

@media print {
    .mobile-menu-btn,
    .mobile-overlay,
    .fab,
    .theme-toggle-btn {
        display: none !important;
    }
    
    .main-nav {
        position: static !important;
        right: auto !important;
        width: auto !important;
        height: auto !important;
        box-shadow: none !important;
        border: none !important;
        background: transparent !important;
    }
    
    .user-info {
        position: static !important;
        right: auto !important;
        width: auto !important;
        background: transparent !important;
        border: none !important;
    }
    
    .header-content {
        flex-direction: row !important;
        justify-content: space-between !important;
    }
    
    .mobile-table-view {
        display: none !important;
    }
    
    .desktop-table-view {
        display: block !important;
    }
}

/* =================================
   Modal Styles
   ================================= */

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: var(--bg-primary);
    margin: 5% auto;
    padding: 0;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 2px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-header h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.close {
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color var(--transition-normal);
}

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

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

/* Form buttons styling */
.form-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.form-buttons .btn {
    flex: 1;
    min-width: 200px;
}

/* Floating button for settings */
.floating-btn {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 100;
}

.btn-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.btn-icon:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

/* Modal animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Mobile responsive for modals */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 10% auto;
        max-height: 85vh;
    }
    
    .modal-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .modal-header h2 {
        font-size: 1.25rem;
    }
    
    .modal-body {
        padding: var(--spacing-lg);
    }
    
    .form-buttons {
        flex-direction: column;
    }
    
    .form-buttons .btn {
        min-width: unset;
        width: 100%;
    }
    
    .floating-btn {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }
    
    .btn-icon {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .modal-content {
        width: 98%;
        margin: 5% auto;
        max-height: 90vh;
    }
    
    .modal-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .modal-header h2 {
        font-size: 1.1rem;
    }
    
    .modal-body {
        padding: var(--spacing-md);
    }
    
    .floating-btn {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .btn-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* =================================
   Button Input Styles
   ================================= */

.button-input-group {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background: var(--bg-secondary);
    transition: all var(--transition-normal);
}

.button-input-group:hover {
    border-color: var(--primary-color);
}

.button-input-row {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.button-input-field {
    flex: 1;
    min-width: 200px;
}

.button-input-field .form-input {
    margin-bottom: 0;
}

.button-input-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.button-input-actions .btn {
    min-width: auto;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 0;
}

#add-button {
    background: var(--success-color);
    color: white;
    border: none;
    transition: all var(--transition-normal);
}

#add-button:hover {
    background: var(--success-dark);
    transform: translateY(-2px);
}

.remove-button {
    background: var(--danger-color);
    color: white;
    border: none;
    transition: all var(--transition-normal);
}

.remove-button:hover {
    background: var(--danger-dark);
    transform: scale(1.1);
}

/* Mobile responsive for button inputs */
@media (max-width: 768px) {
    .button-input-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .button-input-field {
        min-width: 100%;
        width: 100%;
    }
    
    .button-input-actions {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .button-input-group {
        padding: var(--spacing-sm);
    }
    
    .button-input-actions .btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.9rem;
    }
}

/* =================================
   Checkbox Styles
   ================================= */

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

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

.form-checkbox:checked::after {
    content: '✓';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.form-checkbox:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color-opacity);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    margin-bottom: 0;
    font-weight: 500;
    color: var(--text-primary);
    user-select: none;
}

.checkbox-icon {
    font-size: 1.2rem;
}

.checkbox-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
    margin-left: 26px;
}

/* Mobile responsive for checkbox */
@media (max-width: 768px) {
    .checkbox-wrapper {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .checkbox-description {
        margin-left: 0;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .checkbox-label {
        font-size: 0.9rem;
    }
    
    .checkbox-icon {
        font-size: 1.1rem;
    }
    
    .checkbox-description {
        font-size: 0.8rem;
    }
}