/* CSS Variables - Professional IoT Platform */
:root {
    /* Primary Colors - Professional Blue Theme */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    /* Neutral Colors */
    --light: #f8fafc;
    --dark: #1e293b;
    --gray: #64748b;
    --light-gray: #f1f5f9;
    --border: #e2e8f0;
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-light: #94a3b8;
    /* Background Colors */
    --background-color: #f8fafc;
    --background-light: #ffffff;
    --background-dark: #0f172a;
    /* Shadows */
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --shadow-xl: 0 25px 50px rgba(0,0,0,0.15);
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient-dark: linear-gradient(135deg, var(--dark) 0%, #334155 100%);
    --gradient-light: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    /* Border Radius */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
    background-color: var(--background-color);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 2rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.text-sm {
    font-size: 0.875rem;
}

.text-lg {
    font-size: 1.125rem;
}

.text-xl {
    font-size: 1.25rem;
}

/* Buttons - Professional Style */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border: 2px solid transparent;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

    .btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
        transition: left 0.5s;
    }

    .btn:hover::before {
        left: 100%;
    }

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

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

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

    .btn-secondary:hover {
        background: #0891b2;
        transform: translateY(-2px);
        box-shadow: var(--shadow-lg);
    }

.btn-outline {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary);
}

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

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--primary);
}

    .btn-ghost:hover {
        background: var(--primary-light);
        transform: translateY(-2px);
    }

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.875rem;
}

/* Header & Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-logo {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
}

.navbar-toggler {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
    border-radius: var(--radius);
    transition: var(--transition);
}

    .navbar-toggler:hover {
        background: var(--light-gray);
    }

.navbar-collapse {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

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

    .nav-link.active {
        color: var(--primary);
        font-weight: 600;
    }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary);
        }

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-light) 0%, #ffffff 50%, var(--light) 100%);
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

    .hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(circle at 20% 80%, rgba(37, 99, 235, 0.1) 0%, transparent 50%), radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
        pointer-events: none;
    }

.hero-container {
    position: relative;
    z-index: 1;
}

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

.hero-text h1 {
    font-size: 3.75rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text .lead {
    font-size: 1.375rem;
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
}

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

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

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

.dashboard-preview {
    background: var(--background-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    width: 100%;
    max-width: 520px;
    border: 1px solid var(--border);
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: var(--transition);
}

    .dashboard-preview:hover {
        transform: perspective(1000px) rotateY(0) rotateX(0);
    }

.dashboard-header {
    background: var(--primary);
    padding: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-controls {
    display: flex;
    gap: 0.5rem;
}

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

.dashboard-title {
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
}

.dashboard-content {
    padding: 2rem;
}

.metric-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--light);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
    transition: var(--transition);
}

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

.metric-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
    color: var(--text-primary);
}

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

.chart-placeholder {
    height: 200px;
    background: var(--light);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    gap: 0.75rem;
    border: 2px dashed var(--border);
}

    .chart-placeholder i {
        font-size: 2.5rem;
        color: var(--primary);
        opacity: 0.7;
    }

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

    .section-header h2 {
        margin-bottom: 1rem;
    }

    .section-header .lead {
        max-width: 600px;
        margin: 0 auto;
        font-size: 1.25rem;
    }

.section-alt {
    background: var(--light);
}

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

    .section-dark h2,
    .section-dark h3,
    .section-dark .lead {
        color: white;
    }

    .section-dark p {
        color: #cbd5e1;
    }

/* Platform Overview */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.platform-card {
    background: var(--background-light);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

    .platform-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: var(--gradient-primary);
    }

    .platform-card:hover {
        transform: translateY(-8px);
        box-shadow: var(--shadow-xl);
    }

.platform-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--primary);
    font-size: 2rem;
    transition: var(--transition);
}

.platform-card:hover .platform-icon {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

/* Features Section */
.features-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 1rem 2rem;
    background: var(--background-light);
    border: 1px solid var(--border);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    color: var(--text-secondary);
}

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

    .tab-btn:hover:not(.active) {
        border-color: var(--primary);
        color: var(--primary);
    }

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

    .tab-content.active {
        display: block;
    }

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-item {
    background: var(--background-light);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 1.5rem;
    transition: var(--transition);
}

.feature-item:hover .feature-icon {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

/* Architecture Section */
.architecture-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

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

.arch-layer {
    display: flex;
    justify-content: center;
    width: 100%;
}

.arch-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 2rem;
    background: var(--primary-light);
    border-radius: var(--radius-xl);
    color: var(--primary);
    font-weight: 600;
    border: 1px solid var(--border);
    transition: var(--transition);
    width: 200px;
}

    .arch-node:hover {
        background: var(--primary);
        color: white;
        transform: scale(1.05);
    }

    .arch-node i {
        font-size: 2.5rem;
    }

.arch-connector {
    width: 2px;
    height: 40px;
    background: var(--primary-light);
}

.architecture-list {
    list-style: none;
    margin: 2rem 0;
}

    .architecture-list li {
        display: flex;
        align-items: flex-start;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding: 1rem;
        background: var(--light);
        border-radius: var(--radius);
        transition: var(--transition);
    }

        .architecture-list li:hover {
            background: var(--primary-light);
            transform: translateX(8px);
        }

    .architecture-list i {
        color: var(--success);
        margin-top: 0.25rem;
        font-size: 1.25rem;
    }

/* CTA Section */
.cta-section {
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

    .cta-section::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.1) 0%, transparent 50%), radial-gradient(circle at 70% 80%, rgba(255,255,255,0.1) 0%, transparent 50%);
    }

.cta-content {
    position: relative;
    z-index: 1;
}

    .cta-content h2 {
        color: white;
        margin-bottom: 1.5rem;
    }

    .cta-content .lead {
        color: rgba(255,255,255,0.9);
        font-size: 1.375rem;
        margin-bottom: 3rem;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

.cta-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: var(--background-dark);
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: 1.5rem;
}

.footer-section p {
    color: #cbd5e1;
    margin-bottom: 1.5rem;
}

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

    .footer-section ul li {
        margin-bottom: 0.75rem;
    }

.footer-section a {
    color: #94a3b8;
    text-decoration: none;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: 1rem;
}

    .social-links a {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        background: rgba(255,255,255,0.1);
        border-radius: 50%;
        color: white;
        transition: var(--transition);
    }

        .social-links a:hover {
            background: var(--primary);
            transform: translateY(-2px);
        }

.footer-bottom {
    text-align: center;
    padding-top: 3rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #94a3b8;
}

    .footer-bottom a {
        color: #cbd5e1;
        text-decoration: none;
    }

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

/* Responsive Design */
@media (max-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }

    .architecture-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 2.25rem;
    }
}

@media (max-width: 768px) {
    .navbar-toggler {
        display: block;
    }

    .navbar-collapse {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border);
    }

        .navbar-collapse.show {
            display: flex;
        }

    .navbar-nav {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }

    .nav-actions {
        flex-direction: column;
        width: 100%;
    }

        .nav-actions .btn {
            width: 100%;
        }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .metric-cards {
        grid-template-columns: 1fr;
    }

    .cta-actions {
        flex-direction: column;
        align-items: center;
    }

    section {
        padding: 80px 0;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 20px;
    }

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

        .hero-actions .btn {
            width: 100%;
        }

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

    .tab-btn {
        width: 100%;
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .platform-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-4 {
    margin-bottom: 4rem;
}

.p-0 {
    padding: 0;
}

.d-flex {
    display: flex;
}

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

.justify-between {
    justify-content: space-between;
}

.w-100 {
    width: 100%;
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}