/* ===== ROOT VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #2c3e50;
    --primary-dark: #1a252f;
    --secondary-color: #3498db;
    --secondary-dark: #2980b9;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    --background-color: #ecf0f1;
    --surface-color: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #bdc3c7;
    
    /* Gradients */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Typography */
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    --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;
    --font-size-4xl: 2.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

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

/* ===== BUTTONS ===== */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

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

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

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xxl);
    font-size: var(--font-size-lg);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.nav-logo i {
    font-size: var(--font-size-2xl);
    color: var(--secondary-color);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-base);
    position: relative;
}

.nav-link:hover {
    color: var(--secondary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--secondary-color);
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    background: var(--secondary-gradient);
    color: white !important;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.nav-cta::after {
    display: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    margin: 3px 0;
    transition: var(--transition-base);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    color: white;
    position: relative;
    overflow: hidden;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.highlight {
    background: linear-gradient(45deg, #ffffff, #ecf0f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 8px rgba(0,0,0,0.5);
    font-weight: 800;
}

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 1;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
    font-weight: 400;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: #f093fb;
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.dashboard-preview {
    position: relative;
    perspective: 1000px;
}

.preview-screen {
    width: 500px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(20px);
    overflow: hidden;
    transform: rotateY(-15deg) rotateX(5deg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.preview-header {
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.preview-dots {
    display: flex;
    gap: var(--spacing-xs);
}

.preview-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
}

.preview-dots span:nth-child(1) { background: #ff5f57; }
.preview-dots span:nth-child(2) { background: #ffbd2e; }
.preview-dots span:nth-child(3) { background: #28ca42; }

.preview-content {
    padding: var(--spacing-lg);
    height: calc(100% - 40px);
}

.preview-chart {
    width: 100%;
    height: 100%;
}

/* ===== SECTION HEADERS ===== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-header h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.section-header p {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== FEATURES SECTION ===== */
.features {
    padding: var(--spacing-xxl) 0;
    background: var(--surface-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid #e1e8ed;
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    color: white;
    font-size: var(--font-size-2xl);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-list {
    list-style: none;
    margin-top: var(--spacing-lg);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.feature-list i {
    color: var(--success-color);
    font-size: var(--font-size-sm);
}

/* ===== METRICS SECTION ===== */
.metrics {
    padding: var(--spacing-xxl) 0;
    background: var(--background-color);
}

.metrics-chart {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.metrics-chart h3 {
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--primary-color);
}

.metrics-chart canvas {
    max-height: 400px !important;
    width: 100% !important;
}

.preview-chart {
    position: relative;
    height: 200px;
    width: 100%;
}

.preview-chart canvas {
    max-height: 200px !important;
    width: 100% !important;
}

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

.metric-card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: transform var(--transition-base);
}

.metric-card:hover {
    transform: translateY(-2px);
}

.metric-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
}

.metric-icon.cpu {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.metric-icon.memory {
    background: linear-gradient(135deg, #f093fb, #f5576c);
}

.metric-icon.storage {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
}

.metric-icon.security {
    background: linear-gradient(135deg, #43e97b, #38f9d7);
}

.metric-info h3 {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.metric-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.metric-unit {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.metric-bar {
    width: 100%;
    height: 4px;
    background: #e1e8ed;
    border-radius: 2px;
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.metric-progress {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: var(--progress);
    border-radius: 2px;
    transition: width 1s ease-out;
}

.metrics-chart {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.metrics-chart h3 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

/* ===== CTA SECTION ===== */
.cta {
    padding: var(--spacing-xxl) 0;
    background: var(--primary-gradient);
    color: white;
    text-align: center;
}

.cta p {
    color: rgba(255, 255, 255, 0.95);
    font-size: var(--font-size-lg);
    font-weight: 500;
    text-shadow: 0 1px 3px rgba(0,0,0,0.4);
    margin-bottom: var(--spacing-lg);
}

.cta-content h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

.cta-content p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.cta-feature i {
    color: #43e97b;
    font-size: var(--font-size-xl);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-logo i {
    font-size: var(--font-size-2xl);
    color: var(--secondary-color);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-section ul li a:hover {
    color: white;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.status-dot.operational {
    background: var(--success-color);
    box-shadow: 0 0 10px var(--success-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
}

.footer-bottom i {
    color: var(--error-color);
    animation: heartbeat 2s infinite;
}

@keyframes heartbeat {
    0%, 50%, 100% { transform: scale(1); }
    25%, 75% { transform: scale(1.1); }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .preview-screen {
        width: 300px;
        height: 180px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-features {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
    
    .metric-card {
        flex-direction: column;
        text-align: center;
    }
}