/* ============================================
   NODE3 - Security & Risk Advisory
   Rijkshuisstijl Theme (Dutch Government Style)
   Static Website - Hostinger Compatible
   ============================================ */

/* ============================================
   CSS VARIABLES - RIJKSHUISSTIJL
   ============================================ */
:root {
    /* Backgrounds - Fresh & Light */
    --bg-primary: #FFFFFF;
    --bg-secondary: #f5f7f6;
    --bg-tertiary: #FAFBFB;
    --bg-card: #FFFFFF;
    --bg-card-hover: #f5f7f6;
    --hover-bg: #e8ebe9;
    
    /* Text */
    --text-primary: #2D3436;
    --text-secondary: #4a5256;
    --text-muted: #6d7578;
    --text-dim: #9ea5a8;
    
    /* Primary (Anthracite - Dark Charcoal) */
    --primary: #383E42;
    --primary-dark: #2D3436;
    --primary-light: rgba(56, 62, 66, 0.1);
    
    /* Accent (Silver Sage - Soft Gray-Green) */
    --accent: #9CAF94;
    --accent-hover: #8A9E82;
    --accent-dim: rgba(156, 175, 148, 0.25);
    --accent-glow: rgba(156, 175, 148, 0.15);
    
    /* Secondary (Diffused Blue - Soft Muted Blue) */
    --secondary: #8BA8B7;
    --secondary-dark: #7A99A8;
    --secondary-light: rgba(139, 168, 183, 0.15);
    
    /* Borders */
    --border-color: #d8dedd;
    --border-light: #e8ebe9;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    --section-overlap: 80px;
    
    /* Animation */
    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 0.2s;
    --duration-normal: 0.4s;
    --duration-slow: 0.8s;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 16px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background: var(--accent-dim);
    color: var(--text-primary);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.01em;
}

/* Typography based on Rijkshuisstijl specs */
h1 { font-size: clamp(2.5rem, 6vw, 56px); font-weight: 400; }
h2 { font-size: clamp(1.5rem, 4vw, 35px); font-weight: 700; }
h3 { font-size: clamp(1.25rem, 3.5vw, 30px); font-weight: 700; }
h4 { font-size: clamp(1.1rem, 3vw, 25px); font-weight: 700; }
h5 { font-size: 20px; font-weight: 700; }
h6 { font-size: 16px; font-weight: 700; }

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

/* Text links within paragraphs */
.text-link {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

a:hover {
    color: var(--primary-dark);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    position: relative;
    padding: var(--space-3xl) 0;
}

/* ============================================
   HEADER - RIJKSHUISSTIJL
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) var(--space-lg);
    background: var(--primary);
    border-bottom: 1px solid var(--primary-dark);
    transition: box-shadow var(--duration-normal);
}

.site-header.scrolled {
    box-shadow: 0 2px 10px var(--primary-light);
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: #FFFFFF;
    letter-spacing: -0.03em;
}

.logo:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* Desktop Navigation */
.nav-desktop {
    display: flex;
    gap: var(--space-lg);
}

.nav-desktop a {
    font-size: 1.05rem;
    font-weight: 500;
    color: #FFFFFF;
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-desktop a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--duration-normal) var(--ease-out);
}

.nav-desktop a:hover,
.nav-desktop a.active {
    color: #FFFFFF;
    opacity: 0.85;
}

.nav-desktop a:hover::after,
.nav-desktop a.active::after {
    width: 100%;
}

/* Header Right */
.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.lang-toggle button {
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    padding: var(--space-xs);
    transition: color var(--duration-fast);
}

.lang-toggle button:hover {
    color: #FFFFFF;
}

.lang-toggle button.active {
    color: #FFFFFF;
    position: relative;
}

.lang-toggle button.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 2px;
    background: var(--primary);
}

.lang-divider {
    color: rgba(255, 255, 255, 0.5);
    font-weight: 300;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: #FFFFFF;
    transition: all var(--duration-fast) var(--ease-out);
    border-radius: 1px;
}

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

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation */
.nav-mobile {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    padding: var(--space-lg);
    flex-direction: column;
    gap: var(--space-md);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--duration-normal) var(--ease-out);
}

.nav-mobile.active {
    display: flex;
    transform: translateY(0);
    opacity: 1;
}

.nav-mobile a {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.nav-mobile a:last-child {
    border-bottom: none;
}

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    z-index: 10;
    padding-top: 70px;
    padding-bottom: 0;
    box-sizing: border-box;
}

.hero-section .hero-title {
    color: var(--primary);
}

.hero-section .hero-subtitle {
    color: var(--text-primary);
}

.hero-content {
    max-width: 900px;
    padding: 0 var(--space-lg);
    text-align: center;
    width: 100%;
}

.hero-title {
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s var(--ease-smooth) 0.2s forwards;
    white-space: nowrap;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s var(--ease-smooth) 0.4s forwards;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    animation: fadeUp 1s var(--ease-smooth) 0.8s forwards;
}

.scroll-line {
    width: 2px;
    height: 60px;
    background: linear-gradient(180deg, var(--accent) 0%, transparent 100%);
    animation: scrollPulse 1.5s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.4; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.15); }
}

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

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-section {
    background: var(--bg-secondary);
    margin-top: calc(var(--section-overlap) * -1);
    padding-top: calc(var(--section-overlap) + var(--space-3xl));
    position: relative;
    z-index: 20;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
}

.section-label {
    color: var(--primary);
    margin-bottom: var(--space-sm);
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.section-title {
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.section-content {
    max-width: 700px;
}

.section-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.section-text p:last-child {
    margin-bottom: 0;
}

/* Founder Block */
.founder-block {
    margin-top: var(--space-2xl);
    display: flex;
    gap: var(--space-md);
    max-width: 600px;
}

.founder-accent {
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
    flex-shrink: 0;
    border-radius: 2px;
}

.founder-content h4 {
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.founder-name {
    color: var(--primary);
    margin-bottom: var(--space-md);
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.linkedin-link {
    color: var(--text-muted);
    transition: color 0.3s ease;
    display: inline-flex;
}

.linkedin-link:hover {
    color: var(--accent);
}

.founder-content p {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

.founder-content p:last-child {
    margin-bottom: 0;
}

/* ============================================
   TILES SECTION
   ============================================ */
.tiles-section {
    background: var(--bg-primary);
    margin-top: calc(var(--section-overlap) * -1);
    padding-top: calc(var(--section-overlap) + var(--space-3xl));
    position: relative;
    z-index: 30;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.tiles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.tile {
    position: relative;
    min-height: 280px;
    border-radius: 6px;
    overflow: hidden;
    transition: transform var(--duration-normal) var(--ease-out),
                box-shadow var(--duration-normal) var(--ease-out);
}

.tile-bg {
    position: absolute;
    inset: 0;
    border-radius: 6px;
    transition: background var(--duration-normal),
                border-color var(--duration-normal), 
                box-shadow var(--duration-normal);
}

/* Colored tile backgrounds - Silver Sage */
.tile:nth-child(1) .tile-bg,
.tile:nth-child(2) .tile-bg,
.tile:nth-child(3) .tile-bg,
.tile:nth-child(4) .tile-bg {
    background: linear-gradient(135deg, #9CAF94 0%, #8A9E82 100%);
}

.tile:hover {
    transform: translateY(-6px);
}

.tile:hover .tile-bg {
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.tile:hover {
    transform: translateY(-8px);
}

.tile.active .tile-bg {
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.2);
}

.tile-content {
    position: relative;
    z-index: 1;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.tile-icon {
    display: none;
}

.tile h4 {
    margin-bottom: var(--space-sm);
    color: #FFFFFF;
    transition: color var(--duration-fast);
}

.tile:hover h4 {
    color: #FFFFFF;
}

.tile p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0;
    flex-grow: 1;
}

.tile-arrow {
    align-self: flex-end;
    font-size: 1.5rem;
    color: #FFFFFF;
    opacity: 0;
    transform: translateX(-10px);
    transition: all var(--duration-normal) var(--ease-out);
}

.tile:hover .tile-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================
   DETAIL SECTIONS
   ============================================ */
.details-wrapper {
    position: relative;
    z-index: 40;
}

.detail-section {
    background: var(--bg-secondary);
    padding: var(--space-3xl) 0;
    margin-top: calc(var(--section-overlap) * -1);
    padding-top: calc(var(--section-overlap) + var(--space-3xl));
    position: relative;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
    scroll-margin-top: 80px;
}

.detail-section.alt-bg {
    background: var(--bg-primary);
}

.detail-content {
    max-width: 700px;
}

.detail-icon {
    display: none;
}

.detail-section h3 {
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.detail-list {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.detail-list li {
    position: relative;
    padding-left: var(--space-md);
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.detail-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

.cta-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--accent);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    padding: var(--space-sm) var(--space-md);
    border-radius: 4px;
    transition: all var(--duration-normal);
}

.cta-link:hover {
    background: var(--accent-hover);
    color: var(--text-primary);
    gap: var(--space-md);
}

.cta-arrow {
    transition: transform var(--duration-normal);
}

.cta-link:hover .cta-arrow {
    transform: translateX(4px);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-section {
    background: var(--bg-secondary);
    text-align: center;
    padding: var(--space-3xl) 0;
    margin-top: calc(var(--section-overlap) * -1);
    padding-top: calc(var(--section-overlap) + var(--space-3xl));
    position: relative;
    z-index: 50;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
    color: var(--text-secondary);
}

.contact-email {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--bg-primary);
    background: var(--accent);
    padding: var(--space-md) var(--space-lg);
    border-radius: 6px;
    transition: all var(--duration-normal) var(--ease-out);
}

.contact-email:hover {
    background: var(--accent-hover);
    color: var(--text-primary);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.email-arrow {
    transition: transform var(--duration-normal);
}

.contact-email:hover .email-arrow {
    transform: translateX(4px);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background: var(--primary);
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--primary-dark);
}

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

.footer-logo {
    font-size: 1rem;
    font-weight: 700;
    color: #FFFFFF;
}

.footer-kvk {
    font-size: 0.85rem;
    color: #FFFFFF;
}

.footer-copy {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0;
}

.footer-link {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
}

.footer-link:hover {
    color: #FFFFFF;
    text-decoration: underline;
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    transition: border-color var(--duration-fast) ease;
}

.faq-item[open] {
    border-color: var(--accent);
}

.faq-question {
    cursor: pointer;
    padding: var(--space-md);
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::after {
    content: '+';
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--accent);
    flex-shrink: 0;
    transition: transform var(--duration-fast) ease;
}

.faq-item[open] .faq-question::after {
    content: '\2212';
}

.faq-answer {
    padding: 0 var(--space-md) var(--space-md);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-up {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delays for tiles */
.tile.fade-up[data-delay="0"] { transition-delay: 0s; }
.tile.fade-up[data-delay="100"] { transition-delay: 0.2s; }
.tile.fade-up[data-delay="200"] { transition-delay: 0.4s; }
.tile.fade-up[data-delay="300"] { transition-delay: 0.6s; }

/* ============================================
   RESPONSIVE - Mobile First
   ============================================ */

/* Tablet and below */
@media (max-width: 1024px) {
    :root {
        --space-3xl: 6rem;
        --section-overlap: 60px;
    }
    
    .tiles-grid {
        gap: var(--space-sm);
    }
    
    .tile {
        min-height: 240px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 3rem;
        --space-2xl: 4rem;
        --space-3xl: 5rem;
        --section-overlap: 50px;
    }
    
    html {
        scroll-padding-top: 80px;
    }
    
    .nav-desktop {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .site-header {
        padding: var(--space-sm) var(--space-md);
    }
    
    .tiles-grid {
        grid-template-columns: 1fr;
    }
    
    .tile {
        min-height: 200px;
    }
    
    .detail-section {
        margin-top: calc(var(--section-overlap) * -1);
        padding-top: calc(var(--section-overlap) + var(--space-2xl));
    }
    
    .contact-section {
        margin-top: calc(var(--section-overlap) * -1);
        padding-top: calc(var(--section-overlap) + var(--space-2xl));
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
    
    .contact-email {
        font-size: 1rem;
        padding: var(--space-sm) var(--space-md);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        --space-md: 1rem;
        --space-lg: 1.25rem;
    }
    
    .hero-title {
        font-size: 2rem;
        white-space: normal;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .tile-content {
        padding: var(--space-md);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .fade-up {
        opacity: 1;
        transform: none;
    }
}

/* Focus States */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

/* Touch Target Size */
@media (pointer: coarse) {
    .nav-mobile a,
    .hamburger,
    .lang-toggle button {
        min-height: 44px;
        min-width: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}