/* ============================================
   VARIABLES
   ============================================ */
:root {
    --bg-dark: #0d1117;
    --bg-card: #161b22;
    --bg-card-hover: #1c2128;
    --accent: #58a6ff;
    --accent-green: #3fb950;
    --text: #e6edf3;
    --text-muted: #8b949e;
    --border: #30363d;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s ease;
    --radius-sm: 8px;
    --radius-md: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg-dark);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-text-size-adjust: 100%;
}

/* ============================================
   HEADER & BURGER MENU
   ============================================ */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    background: rgba(13, 17, 23, 0.95);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.logo:hover {
    color: var(--text);
    transform: scale(1.02);
}

/* Burger button */
.burger-wrap {
    position: relative;
}

.burger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.burger-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    transform: scale(1.05);
}

.burger-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-muted);
    border-radius: 2px;
    transition: background var(--transition-fast), transform var(--transition-smooth);
}

.burger-btn:hover span {
    background: var(--accent);
}

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

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

.burger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Dropdown menu */
.burger-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition-smooth), visibility var(--transition-smooth), transform var(--transition-smooth);
    z-index: 200;
}

.burger-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.burger-menu a {
    display: block;
    padding: 1rem 1.25rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--border);
    transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
}

.burger-menu a:last-child {
    border-bottom: none;
}

.burger-menu a:hover {
    color: var(--accent);
    background: var(--bg-card-hover);
    padding-left: 1.5rem;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: 5rem 2rem;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.125rem;
    transition: color var(--transition-fast);
}

.hero:hover p {
    color: var(--text);
}

.badge {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    color: var(--accent-green);
    margin-top: 1.5rem;
    transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.badge:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-green);
    transform: scale(1.05);
}

.hero .cursor {
    color: var(--accent);
    animation: blink 1s step-end infinite;
}

.hero .cursor.blink {
    animation: none;
    opacity: 0.7;
}

/* ============================================
   SECTIONS (SKILLS, OVER MIJ, CV)
   ============================================ */
.section {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text);
    transition: color var(--transition-fast);
}

.section h2:hover {
    color: var(--accent);
}

/* Skill categories */
.skill-category {
    margin-bottom: 3rem;
}

.skill-category h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast), letter-spacing var(--transition-fast);
}

.skill-category h3:hover {
    color: var(--text);
    letter-spacing: 0.1em;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
    transition: transform var(--transition-smooth), border-color var(--transition-fast), background var(--transition-fast);
}

.skill-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    background: var(--bg-card-hover);
}

.skill-card .icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    transition: transform var(--transition-fast);
}

.skill-card:hover .icon {
    transform: scale(1.15);
}

.skill-card span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

/* Over mij section */
.over-mij-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    line-height: 1.8;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.over-mij-content:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(88, 166, 255, 0.1);
}

.over-mij-foto {
    width: 180px;
    height: 180px;
    min-width: 180px;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid var(--border);
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.over-mij-content:hover .over-mij-foto {
    border-color: var(--accent);
    transform: scale(1.02);
}

.over-mij-tekst {
    flex: 1;
}

/* CV section */
.cv-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.cv-content:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(88, 166, 255, 0.1);
}

.cv-titel {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.cv-layout {
    position: relative;
}

.cv-foto {
    position: absolute;
    top: 0;
    right: 0;
    width: 140px;
    height: 140px;
    object-fit: cover;
    border-radius: 8px;
    border: 2px solid var(--border);
}

.cv-kolommen {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-right: 160px;
}

.cv-kolom h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 1.5rem 0 0.5rem;
}

.cv-kolom h4:first-child {
    margin-top: 0;
}

.cv-lijst {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0 1rem;
    font-size: 0.9rem;
}

.cv-lijst dt {
    color: var(--text-muted);
}

.cv-lijst dd {
    margin: 0;
}

.cv-bullets {
    margin: 0;
    padding-left: 1.25rem;
    font-size: 0.9rem;
}

.cv-bullets li {
    margin-bottom: 0.25rem;
}

.cv-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.cv-skills span {
    background: var(--bg-dark);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    color: var(--accent);
}

.cv-kolom p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-muted);
    margin: 0.5rem 0;
}

.cv-content a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.cv-content a:hover {
    color: var(--text);
}

/* Projecten section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    transition: transform var(--transition-smooth), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(88, 166, 255, 0.15);
}

.project-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.project-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.project-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.project-card-header .project-icon {
    font-size: 2.5rem;
    margin-bottom: 0;
    transition: transform var(--transition-fast);
}

.project-card:hover .project-card-header .project-icon {
    transform: scale(1.1);
}

.project-type-badge {
    font-size: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 2rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    flex-shrink: 0;
}

.project-type-badge.web {
    background: rgba(88, 166, 255, 0.1);
    color: var(--accent);
    border: 1px solid rgba(88, 166, 255, 0.3);
}

.project-type-badge.mobile {
    background: rgba(63, 185, 80, 0.1);
    color: var(--accent-green);
    border: 1px solid rgba(63, 185, 80, 0.3);
}

.project-card--featured {
    border-color: rgba(63, 185, 80, 0.35);
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(63, 185, 80, 0.04) 100%);
    position: relative;
    overflow: hidden;
}

.project-card--featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent));
    opacity: 0.8;
}

.project-card--featured:hover {
    border-color: var(--accent-green);
    box-shadow: 0 8px 24px rgba(63, 185, 80, 0.15);
}

.project-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
}

.feature-chip {
    font-size: 0.75rem;
    padding: 0.2rem 0.55rem;
    background: rgba(63, 185, 80, 0.08);
    border: 1px solid rgba(63, 185, 80, 0.2);
    border-radius: 1rem;
    color: var(--text-muted);
}

.project-tags {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
    opacity: 0.9;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(88, 166, 255, 0.1);
}

.contact-intro {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    max-width: 520px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.1rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    border: 1px solid var(--border);
    transition: transform var(--transition-smooth), border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-btn:hover {
    transform: translateX(6px);
    background: var(--bg-card-hover);
}

.contact-btn--email:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 16px rgba(88, 166, 255, 0.12);
}

.contact-btn--linkedin:hover {
    border-color: #0a66c2;
    box-shadow: 0 4px 16px rgba(10, 102, 194, 0.15);
}

.contact-btn-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-btn-text {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.contact-btn-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.contact-btn--email .contact-btn-label { color: var(--accent); }
.contact-btn--linkedin .contact-btn-label { color: #0a66c2; }

.contact-btn-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--text);
}

/* ============================================
   FOOTER & CONTACT
   ============================================ */
footer {
    text-align: center;
    padding: 3rem 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast), text-decoration var(--transition-fast);
}

footer a:hover {
    color: var(--text);
    text-decoration: underline;
}

footer p {
    transition: color var(--transition-fast);
}

footer:hover p {
    color: var(--text);
}

/* Typing cursor animatie */
@keyframes blink {
    50% { opacity: 0; }
}

/* Terug-naar-boven knop */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--bg-dark);
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity var(--transition-smooth), visibility var(--transition-smooth), transform var(--transition-smooth);
    z-index: 90;
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.4);
    -webkit-tap-highlight-color: transparent;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--text);
    color: var(--bg-dark);
    transform: translateY(-2px);
}

.back-to-top:active {
    transform: scale(0.95);
}

/* Scroll-animaties */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-card.animate-on-scroll {
    transform: translateY(20px);
}

.skill-card.animate-on-scroll.visible {
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */
@media (max-width: 768px) {
    .section {
        padding: 2.5rem 1.5rem;
    }

    .hero {
        padding: 4rem 1.5rem;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .cv-kolommen {
        grid-template-columns: 1fr;
        margin-right: 0;
    }

    .cv-foto {
        position: static;
        display: block;
        margin: 0 auto 1.5rem;
    }
}

/* ============================================
   RESPONSIVE - MOBIEL
   ============================================ */
@media (max-width: 480px) {
    header {
        padding: 1rem 1rem;
        padding-top: max(1rem, env(safe-area-inset-top));
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .burger-btn {
        width: 48px;
        height: 48px;
        padding: 12px;
        min-width: 48px;
        min-height: 48px;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }

    /* Full-screen menu overlay op mobiel */
    .menu-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 150;
        opacity: 0;
        transition: opacity var(--transition-smooth);
    }

    .menu-overlay.visible {
        display: block;
        opacity: 1;
    }

    .burger-menu {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: auto;
        width: min(280px, 85vw);
        min-height: 100vh;
        min-height: 100dvh;
        border-radius: 0;
        border-left: 1px solid var(--border);
        transform: translateX(100%);
        transition: transform var(--transition-smooth);
        padding-top: max(5rem, calc(60px + env(safe-area-inset-top)));
        padding-right: env(safe-area-inset-right);
        padding-bottom: env(safe-area-inset-bottom);
    }

    .burger-menu.open {
        transform: translateX(0);
    }

    .burger-menu a {
        min-height: 52px;
        padding: 1rem 1.5rem;
        font-size: 1.1rem;
        display: flex;
        align-items: center;
        -webkit-tap-highlight-color: transparent;
    }

    .burger-menu a:active {
        background: var(--bg-card-hover);
    }

    .section {
        padding: 2rem 1rem;
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .hero {
        padding: 3rem 1rem;
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.625rem;
    }

    .skill-card {
        padding: 1rem;
        min-height: 90px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        -webkit-tap-highlight-color: transparent;
    }

    .skill-card:active {
        transform: scale(0.98);
    }

    .skill-card .icon {
        font-size: 1.75rem;
    }

    .skill-card span {
        font-size: 0.8rem;
    }

    .over-mij-content {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
    }

    .over-mij-foto {
        width: 140px;
        height: 140px;
        min-width: 140px;
    }

    .cv-content {
        padding: 1.5rem;
    }

    .cv-foto {
        width: 120px;
        height: 120px;
    }

    .contact-card {
        padding: 1.5rem;
    }

    .contact-btn-value {
        font-size: 0.78rem;
    }

    footer {
        padding: 2rem 1rem;
        padding-bottom: max(2rem, env(safe-area-inset-bottom));
    }

    footer a {
        display: inline-block;
        padding: 0.25rem 0;
        min-height: 44px;
        line-height: 2;
    }

    .back-to-top {
        bottom: max(1.5rem, env(safe-area-inset-bottom));
        right: max(1rem, env(safe-area-inset-right));
    }
}

/* Menu-overlay (zichtbaar op mobiel bij open menu) */
.menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 150;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-smooth);
    -webkit-tap-highlight-color: transparent;
}

.menu-overlay.visible {
    display: block;
    opacity: 1;
}

@media (min-width: 481px) {
    .menu-overlay.visible {
        display: none !important;
    }
}

/* Geen hover-effecten op touch devices (battery/performance) */
@media (hover: none) {
    .skill-card:hover,
    .project-card:hover {
        transform: none;
    }

    .skill-card:active {
        transform: scale(0.98);
    }

    .project-card:active {
        transform: scale(0.98);
    }

    .burger-btn:hover {
        transform: none;
    }

    .logo:hover {
        transform: none;
    }
}