/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.logo {
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Main Content */
.main {
    margin-top: 80px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    z-index: 2;
    position: relative;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-graphic {
    position: relative;
    width: 400px;
    height: 400px;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: 20%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 20%;
    left: 30%;
    animation-delay: 4s;
}

.card-icon {
    font-size: 2rem;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-secondary:active {
    transform: translateY(1px);
}

/* Section Styles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* Features Section */
.features {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Courses Section */
.courses {
    padding: 5rem 0;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.course-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-placeholder {
    font-size: 4rem;
    opacity: 0.8;
}

.course-content {
    padding: 1.5rem;
}

.course-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.course-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    gap: 1rem;
}

.course-duration,
.course-level {
    background: var(--bg-tertiary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* About Section */
.about {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

.about-graphic {
    position: relative;
    width: 300px;
    height: 300px;
}

.pulse-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.pulse-circle:nth-child(1) {
    width: 100px;
    height: 100px;
}

.pulse-circle:nth-child(2) {
    width: 150px;
    height: 150px;
    animation-delay: 0.5s;
}

.pulse-circle:nth-child(3) {
    width: 200px;
    height: 200px;
    animation-delay: 1s;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 0;
    }
}

/* Contact Section */
.contact {
    padding: 5rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    font-size: 1.5rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

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

.footer-logo {
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Notification */
.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: var(--success-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1001;
}

.notification.show {
    transform: translateX(0);
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notification-icon {
    font-size: 1.25rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 2rem 1rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-graphic {
        width: 300px;
        height: 300px;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .stats {
        justify-content: center;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .features-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .stats {
        flex-direction: column;
        gap: 1rem;
    }
}

/* PWA Specific Styles */
@media (display-mode: standalone) {
    .header {
        padding-top: env(safe-area-inset-top);
    }
    
    .main {
        margin-top: calc(80px + env(safe-area-inset-top));
    }
}

/* iOS Install Modal */
.ios-install-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 1rem;
}

.ios-modal-content {
    background: white;
    border-radius: var(--radius-lg);
    max-width: 400px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

.ios-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.ios-modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.ios-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ios-modal-body {
    padding: 1.5rem;
}

.ios-step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.ios-step-number {
    background: var(--primary-color);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.ios-step-text {
    flex: 1;
    color: var(--text-primary);
    line-height: 1.5;
}

.ios-share-icon {
    font-size: 1.2rem;
    margin-left: 0.5rem;
}

.ios-note {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    margin-top: 1rem;
}

.ios-troubleshoot {
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
}

.ios-troubleshoot h4 {
    margin: 0 0 0.5rem 0;
    color: var(--warning-color);
    font-size: 0.9rem;
}

.ios-troubleshoot p {
    margin: 0 0 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.ios-troubleshoot ol {
    margin: 0;
    padding-left: 1rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.ios-troubleshoot li {
    margin-bottom: 0.25rem;
}

.ios-warning {
    background: rgba(255, 87, 34, 0.1);
    border: 1px solid rgba(255, 87, 34, 0.3);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
    color: #ff5722;
    font-size: 0.8rem;
    font-weight: 500;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* iOS specific styles */
@supports (-webkit-touch-callout: none) {
    .hero {
        padding-top: env(safe-area-inset-top);
    }
    
    .header {
        padding-top: env(safe-area-inset-top);
    }
    
    .main {
        margin-top: calc(80px + env(safe-area-inset-top));
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-light: #64748b;
        
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        
        --border-color: #334155;
    }
    
    .ios-modal-content {
        background: var(--bg-primary);
        color: var(--text-primary);
    }
    
    .ios-modal-header {
        border-bottom-color: var(--border-color);
    }
    
    .ios-note {
        background: var(--bg-tertiary);
        color: var(--text-secondary);
    }
}

/* Debug Window Styles */
.debug-window {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    background: var(--bg-primary);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 10000;
    display: none;
    overflow: hidden;
}

.debug-header {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.debug-header h3 {
    margin: 0;
    font-size: 1.125rem;
}

.debug-header .btn {
    margin: 0 0.25rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.debug-header .btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.debug-content {
    padding: 1rem;
    max-height: calc(80vh - 80px);
    overflow-y: auto;
}

.debug-info {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.debug-info p {
    margin: 0.25rem 0;
    font-size: 0.875rem;
}

.debug-logs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.debug-log-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    transition: all 0.2s ease;
}

.debug-log-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.debug-log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.debug-time {
    font-size: 0.75rem;
    color: var(--text-light);
    font-family: monospace;
}

.debug-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.debug-log-data {
    background: var(--bg-tertiary);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

.debug-log-data pre {
    margin: 0;
    font-size: 0.75rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-word;
}

/* Debug Button */
.debug-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    transition: all 0.3s ease;
}

.debug-toggle:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.debug-toggle:active {
    transform: scale(0.95);
}

/* Analytics Dashboard Styles */
.analytics-dashboard {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.header-left h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.last-updated {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.update-icon {
    animation: spin 2s linear infinite;
}

.btn-refresh {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-refresh:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.stat-card.primary {
    border-left: 4px solid var(--primary-color);
}

.stat-card.success {
    border-left: 4px solid var(--success-color);
}

.stat-card.warning {
    border-left: 4px solid var(--warning-color);
}

.stat-card.info {
    border-left: 4px solid var(--secondary-color);
}

.stat-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.stat-content {
    flex: 1;
}

.stat-content h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0 0 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.25rem 0;
}

.stat-change {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    display: inline-block;
}

.stat-change.positive {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.stat-change.negative {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.stat-change.neutral {
    background: rgba(100, 116, 139, 0.1);
    color: var(--text-secondary);
}

/* Charts Section */
.charts-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-container {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.chart-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.chart-controls select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.chart-content {
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-content canvas {
    max-height: 100%;
    max-width: 100%;
}

/* Simple Chart Styles */
.simple-chart {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.chart-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: center;
}

.chart-bars {
    flex: 1;
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 2px;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    border-left: 1px solid var(--border-color);
    position: relative;
}

.chart-bar {
    flex: 1;
    background: linear-gradient(to top, #2563eb, #3b82f6);
    border-radius: 2px 2px 0 0;
    position: relative;
    transition: all 0.3s ease;
    cursor: pointer;
    min-height: 4px;
}

.chart-bar:hover {
    background: linear-gradient(to top, #1d4ed8, #2563eb);
    transform: scaleY(1.05);
}

.bar-value {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.chart-bar:hover .bar-value {
    opacity: 1;
}

.chart-legend {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

/* Product List */
.product-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.product-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.product-item:hover {
    background: var(--bg-tertiary);
}

.product-rank {
    width: 30px;
    height: 30px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.product-name {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
}

.product-sales {
    font-weight: 600;
    color: var(--success-color);
}

/* Activity Section */
.activity-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.activity-item:hover {
    background: var(--bg-tertiary);
}

.activity-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.activity-content {
    flex: 1;
}

.activity-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.activity-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.activity-amount {
    font-weight: 600;
    color: var(--success-color);
}

/* Quick Actions */
.quick-actions {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.quick-actions h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 1rem 0;
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--text-primary);
}

.action-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.action-icon {
    font-size: 1.5rem;
}

.action-text {
    font-weight: 500;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .analytics-dashboard {
        padding: 1rem;
    }
    
    .dashboard-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .charts-section {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
    
    .actions-grid {
        grid-template-columns: 1fr;
    }
}

/* Modern Login Screen Styles */
.login-screen {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.login-screen::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.login-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 450px;
    width: 100%;
    position: relative;
    z-index: 1;
}

/* Modern Header */
.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 4rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: float 3s ease-in-out infinite;
}

.logo-text h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2d3748;
    margin: 0;
    letter-spacing: -0.02em;
}

.logo-text p {
    font-size: 1rem;
    color: #718096;
    margin: 0.5rem 0 0 0;
    font-weight: 500;
}

/* PIN Section */
.pin-section {
    text-align: center;
}

.pin-header {
    margin-bottom: 2rem;
}

.pin-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2d3748;
    margin: 0 0 0.5rem 0;
}

.pin-header p {
    font-size: 0.875rem;
    color: #718096;
    margin: 0;
}

/* PIN Display */
.pin-input-container {
    margin-bottom: 2rem;
}

.pin-display {
    margin-bottom: 2rem;
}

.pin-dots {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.pin-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #e2e8f0;
    border: 2px solid #cbd5e0;
    transition: all 0.3s ease;
    position: relative;
}

.pin-dot.filled {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-color: #667eea;
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.pin-dot.filled::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

/* Modern Keyboard */
.keyboard {
    display: grid;
    gap: 0.75rem;
    max-width: 300px;
    margin: 0 auto;
}

.keyboard-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.key {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    padding: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3748;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.key:hover {
    background: #f7fafc;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.key:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.key-clear {
    background: linear-gradient(135deg, #fed7d7, #feb2b2);
    border-color: #fc8181;
    color: #c53030;
}

.key-backspace {
    background: linear-gradient(135deg, #bee3f8, #90cdf4);
    border-color: #63b3ed;
    color: #2b6cb0;
}

/* PIN Actions */
.pin-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 16px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
    min-height: 56px;
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    background: #e2e8f0;
    color: #a0aec0;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-secondary {
    background: white;
    color: #718096;
    border: 2px solid #e2e8f0;
}

.btn-secondary:hover {
    background: #f7fafc;
    border-color: #cbd5e0;
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 1.25rem;
}

.btn-text {
    font-weight: 600;
}

/* Error Message */
.error-message {
    background: linear-gradient(135deg, #fed7d7, #feb2b2);
    border: 1px solid #fc8181;
    color: #c53030;
    padding: 1rem;
    border-radius: 12px;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.error-icon {
    font-size: 1.25rem;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    color: white;
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header .logo-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-header .logo-icon {
    font-size: 24px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    padding: 8px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.sidebar-header .logo-text h1 {
    font-size: 18px;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-header .logo-text p {
    font-size: 12px;
    color: #94a3b8;
    margin: 0;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger {
    display: block;
    width: 20px;
    height: 2px;
    background: white;
    position: relative;
    transition: all 0.3s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    top: 6px;
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    margin: 4px 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.2s ease;
    border-radius: 0 25px 25px 0;
    margin-right: 20px;
}

.nav-link:hover {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    transform: translateX(4px);
}

.nav-item.active .nav-link {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.nav-icon {
    font-size: 18px;
    width: 20px;
    text-align: center;
}

.nav-text {
    font-weight: 500;
    font-size: 14px;
}

.sidebar-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.2);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.user-details {
    flex: 1;
}

.user-name {
    font-weight: 600;
    font-size: 14px;
    color: white;
}

.user-role {
    font-size: 12px;
    color: #94a3b8;
}

.logout-btn {
    width: 100%;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    transform: translateY(-1px);
}

.logout-icon {
    font-size: 16px;
}

/* Page Styles */
.page-header {
    margin-bottom: 30px;
    padding: 20px 0;
    border-bottom: 1px solid #e2e8f0;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: #1e293b;
    margin: 0 0 8px 0;
}

.page-header p {
    font-size: 16px;
    color: #64748b;
    margin: 0;
}

/* Data Table Styles */
.data-table-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-top: 20px;
}

.table-header {
    padding: 20px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #f8fafc;
}

.table-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1e293b;
    margin: 0;
}

.table-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.table-controls select {
    padding: 8px 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 14px;
    background: white;
    color: #374151;
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    background: #f8fafc;
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    color: #374151;
    border-bottom: 1px solid #e2e8f0;
    white-space: nowrap;
}

.data-table td {
    padding: 16px 20px;
    border-bottom: 1px solid #f1f5f9;
    color: #64748b;
    white-space: nowrap;
}

.data-table tr:hover {
    background: #f8fafc;
}

.loading-row {
    text-align: center;
    color: #94a3b8;
    font-style: italic;
}

.status-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
}

.status-badge.success {
    background: #dcfce7;
    color: #166534;
}

.status-badge.warning {
    background: #fef3c7;
    color: #92400e;
}

.status-badge.error {
    background: #fee2e2;
    color: #991b1b;
}

.action-btn-small {
    padding: 4px 8px;
    background: #3b82f6;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.2s ease;
}

.action-btn-small:hover {
    background: #2563eb;
}

/* App Main Layout */
.app-main {
    margin-left: 280px;
    transition: margin-left 0.3s ease;
}

.app-main.sidebar-collapsed {
    margin-left: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 100%;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .app-main {
        margin-left: 0;
    }
    
    .table-wrapper {
        font-size: 12px;
    }
    
    .data-table th,
    .data-table td {
        padding: 12px 8px;
    }
}

/* Responsive Design */
@media (max-width: 480px) {
    .login-container {
        padding: 2rem;
        margin: 1rem;
    }
    
    .logo-text h1 {
        font-size: 2rem;
    }
    
    .keyboard {
        max-width: 280px;
    }
    
    .key {
        min-height: 50px;
        font-size: 1.125rem;
    }
}