/* ========================================
   TrustEnergy.nl - Infinity Flow Design
   Modern Energy Sector Styling
   ======================================== */

/* CSS Variables - Design System */
:root {
    /* Infinity Flow Colors */
    --teal-primary: #14b8a6;
    --teal-dark: #0d9488;
    --cyan: #0891b2;
    --navy-primary: #1e40af;
    --navy-dark: #1e3a8a;
    
    /* Semantic Colors */
    --acquisition-color: #14b8a6;
    --retention-color: #1e3a8a;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ========================================
   Base Styles
   ======================================== */

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

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

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-normal);
    color: var(--gray-900);
    background-color: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   Navigation
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--navy-primary);
}

.logo i {
    color: var(--teal-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--teal-primary);
}

.btn-primary-nav {
    background: linear-gradient(135deg, var(--teal-primary), var(--cyan));
    color: var(--white) !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: var(--font-weight-semibold);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    background: linear-gradient(135deg, #f0fdfa 0%, #ecfeff 50%, #dbeafe 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(20, 184, 166, 0.1), transparent 70%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: var(--font-weight-extrabold);
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--navy-dark), var(--teal-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--gray-700);
    box-shadow: var(--shadow-sm);
}

.badge i {
    color: var(--teal-primary);
}

/* ========================================
   Infinity Flow Visualization
   ======================================== */

.infinity-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
}

.infinity-loop {
    width: 100%;
    max-width: 600px;
    height: auto;
}

.infinity-path {
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    animation: infinityFlow 8s ease-in-out infinite;
}

@keyframes infinityFlow {
    0% {
        stroke-dashoffset: 2000;
    }
    50% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: -2000;
    }
}

.stage-marker {
    cursor: pointer;
    transition: var(--transition-fast);
}

.stage-marker:hover {
    r: 16;
    filter: drop-shadow(0 0 8px currentColor);
}

.stage-label {
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.infinity-center-label {
    font-family: var(--font-primary);
    font-size: 16px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.infinity-explanation {
    text-align: center;
    font-size: 0.875rem;
    color: var(--gray-600);
    font-style: italic;
}

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

.segmentation {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-extrabold);
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--navy-dark);
}

.section-subtitle {
    font-size: 1.125rem;
    text-align: center;
    color: var(--gray-600);
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.segment-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 2px solid transparent;
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
}

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

.residential-card {
    border-color: var(--teal-primary);
}

.residential-card:hover {
    box-shadow: 0 20px 40px -5px rgba(20, 184, 166, 0.3);
}

.business-card {
    border-color: var(--navy-primary);
}

.business-card:hover {
    box-shadow: 0 20px 40px -5px rgba(30, 64, 175, 0.3);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.residential-card .card-icon {
    color: var(--teal-primary);
}

.business-card .card-icon {
    color: var(--navy-primary);
}

.card-title {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.card-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.card-benefits {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.benefit {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--gray-700);
}

.benefit i {
    color: var(--success);
    font-size: 1.125rem;
}

.btn-card {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    transition: var(--transition-normal);
    margin-bottom: var(--spacing-md);
}

.btn-residential {
    background: linear-gradient(135deg, var(--teal-primary), var(--cyan));
    color: var(--white);
}

.btn-residential:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(20, 184, 166, 0.4);
}

.btn-business {
    background: linear-gradient(135deg, var(--navy-primary), var(--cyan));
    color: var(--white);
}

.btn-business:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(30, 64, 175, 0.4);
}

.card-loop-indicator {
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    text-align: center;
}

.loop-stage {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: var(--font-weight-medium);
}

/* ========================================
   Infinity Model Explanation
   ======================================== */

.infinity-explanation-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.comparison-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.comparison-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.comparison-header i {
    font-size: 2rem;
}

.old-way .comparison-header i {
    color: var(--error);
}

.new-way .comparison-header i {
    color: var(--success);
}

.comparison-header h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--gray-900);
}

.funnel-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.funnel-step {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--gray-100);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: var(--font-weight-medium);
    color: var(--gray-700);
}

.funnel-arrow {
    font-size: 1.5rem;
    color: var(--gray-400);
}

.dead-end {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    font-weight: var(--font-weight-bold);
    border: 2px dashed var(--error);
}

.funnel-problem {
    text-align: center;
    color: var(--error);
    font-style: italic;
    margin-top: var(--spacing-md);
}

.loop-visual {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.loop-arc {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
}

.acquisition-arc {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1), rgba(8, 145, 178, 0.1));
    border-left: 4px solid var(--teal-primary);
}

.retention-arc {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.1), rgba(30, 58, 138, 0.1));
    border-left: 4px solid var(--navy-primary);
}

.loop-arc h4 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.loop-arc ul {
    list-style: none;
    padding-left: var(--spacing-md);
}

.loop-arc li {
    margin-bottom: var(--spacing-xs);
    color: var(--gray-700);
}

.loop-arc li strong {
    color: var(--gray-900);
}

.loop-connector {
    text-align: center;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--cyan);
    padding: var(--spacing-sm);
}

/* ========================================
   Post-Analysis CTA Demo
   ======================================== */

.cta-demo-section {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.cta-demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.cta-demo-card {
    background: var(--gray-50);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
}

.cta-demo-title {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.cta-demo-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.cta-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.cta-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.cta-option:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.cta-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--teal-primary), var(--cyan));
    border-radius: var(--radius-lg);
    color: var(--white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.cta-content {
    flex-grow: 1;
}

.cta-content h4 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--gray-900);
    margin-bottom: 4px;
}

.cta-content p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
}

.loop-stage-badge {
    display: inline-block;
    padding: 4px var(--spacing-sm);
    background: var(--teal-primary);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.loop-stage-badge.business {
    background: var(--navy-primary);
}

.btn-demo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gray-900);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: var(--font-weight-semibold);
    transition: var(--transition-normal);
}

.btn-demo:hover {
    background: var(--gray-700);
    transform: translateY(-2px);
}

/* ========================================
   Why Section
   ======================================== */

.why-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-normal);
}

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

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--teal-primary), var(--cyan));
    border-radius: 50%;
    color: var(--white);
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ========================================
   Final CTA
   ======================================== */

.final-cta {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--navy-dark), var(--navy-primary));
    color: var(--white);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--spacing-md);
}

.cta-content > p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

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

.btn-primary-large,
.btn-secondary-large {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

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

.btn-primary-large:hover {
    background: var(--teal-dark);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px -5px rgba(20, 184, 166, 0.5);
}

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

.btn-secondary-large:hover {
    background: var(--gray-100);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px -5px rgba(255, 255, 255, 0.3);
}

.cta-reassurance {
    font-size: 0.875rem;
    opacity: 0.8;
}

.cta-reassurance i {
    color: var(--teal-primary);
    margin: 0 var(--spacing-xs);
}

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

.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

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

.footer-col h4 {
    color: var(--white);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

.footer-col p {
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

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

.footer-col ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-col a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-col a:hover {
    color: var(--teal-primary);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gray-700);
    border-radius: 50%;
    color: var(--white);
    font-size: 1.125rem;
    transition: var(--transition-normal);
}

.social-links a:hover {
    background: var(--teal-primary);
    transform: translateY(-4px);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: 0.875rem;
}

.footer-bottom a {
    color: var(--gray-300);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--teal-primary);
}

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

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-demo-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background: var(--white);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero {
        padding: calc(80px + var(--spacing-lg)) 0 var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .segment-card {
        padding: var(--spacing-lg);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary-large,
    .btn-secondary-large {
        width: 100%;
        max-width: 300px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .infinity-loop {
        max-width: 100%;
    }
    
    .badge {
        font-size: 0.75rem;
        padding: 4px var(--spacing-xs);
    }
}