/* ============================================
   MODERN PORTFOLIO - REMKO VAN DEN HOEF
   ============================================ */

/* CSS Variables */
:root {
    /* Light Mode Colors */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-secondary: #8b5cf6;
    --color-accent: #06b6d4;
    
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-surface: #ffffff;
    
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #64748b;
    
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-card: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 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);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Dark Mode Variables */
body.dark-mode {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-surface: #1e293b;
    
    --color-text: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.3);
    
    --gradient-card: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
}

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

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

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    transition: background var(--transition-base), color var(--transition-base);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4.5rem;
}

/* Logo */
.logo a {
    text-decoration: none;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Desktop Navigation */
.desktop-nav {
    display: none;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .desktop-nav {
        display: flex;
        align-items: center;
    }
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

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

/* Desktop Controls */
.desktop-controls {
    display: none;
    gap: var(--spacing-sm);
    align-items: center;
}

@media (min-width: 768px) {
    .desktop-controls {
        display: flex;
    }
}

/* Dark Mode Toggle */
.dark-mode-btn {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.dark-mode-btn:hover {
    background: var(--color-primary);
    color: white;
    transform: scale(1.05);
}

.dark-mode-btn svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    gap: 0.25rem;
    background: var(--color-bg-tertiary);
    padding: 0.25rem;
    border-radius: var(--radius-full);
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    color: var(--color-text);
}

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

/* Mobile Toggle */
.mobile-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .mobile-toggle {
        display: none;
    }
}

.menu-btn {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--color-text);
}

/* Mobile Navigation */
.mobile-nav {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .mobile-nav {
        display: none !important;
    }
}

.mobile-nav-content {
    padding: var(--spacing-md);
}

.mobile-nav-link {
    display: block;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-primary);
}

.mobile-lang {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-md);
    overflow: hidden;
}

/* Animated Background */
.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    bottom: -10%;
    right: -10%;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* Hero Content */
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

/* Hero Image */
.hero-image-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-lg);
}

.hero-image {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 4px solid var(--color-surface);
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 2;
}

.hero-image-ring {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    z-index: 1;
    animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.3;
    }
}

.hero-name {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 1s ease;
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1.2s ease;
    margin-bottom: 4rem; /* Add space below buttons */
}

.btn {
    padding: 1rem 2rem;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    border: none;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   SECTIONS
   ============================================ */

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

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

.section-label {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-card);
    border-radius: var(--radius-full);
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--color-text);
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about-section {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .about-content {
        grid-template-columns: 2fr 1fr;
        align-items: center;
    }
}

.about-text {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.about-text p {
    margin-bottom: var(--spacing-md);
}

/* Stats */
.about-stats {
    display: grid;
    gap: var(--spacing-md);
}

.stat-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */

.experience-section {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg);
}

.experience-grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.experience-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

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

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

.experience-card:hover::before {
    transform: scaleX(1);
}

.experience-logo {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background: var(--color-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
}

.experience-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.experience-role {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.experience-company {
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.experience-period {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* Experience Badges */
.experience-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.experience-badge.current {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.experience-badge.founder {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact-section {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

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

.contact-text {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.btn-linkedin {
    background: #0077b5;
    color: white;
    box-shadow: var(--shadow-lg);
}

.btn-linkedin:hover {
    background: #005582;
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.linkedin-icon {
    width: 1.5rem;
    height: 1.5rem;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.hidden {
    display: none !important;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 767px) {
    .hero-section {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .hero-image {
        width: 150px;
        height: 150px;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .experience-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ANIMATIONS & TRANSITIONS
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}