/* ============================================
   v2 — unpredictable.ai
   Modern portfolio for Bas Niesink
   ============================================ */

:root {
  --color-bg: #fafafa;
  --color-bg-dark: #0a0a0a;
  --color-surface: #ffffff;
  --color-surface-dark: #141414;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b7280;
  --color-text-dark: #e5e5e5;
  --color-text-dark-secondary: #9ca3af;
  --color-accent: #f59e0b;
  --color-accent-light: #fbbf24;
  --color-border: #e5e7eb;
  --color-border-dark: #262626;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- Container ---- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 0.938rem;
  font-weight: 600;
  border-radius: 100px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #0a0a0a;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ---- Section ---- */
.section {
  padding: 120px 0;
  position: relative;
}

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

.section-label {
  font-family: var(--font-mono);
  font-size: 0.813rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.section-dark .section-title {
  color: #fff;
}

/* ============================================
   NAV
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
}

.logo-mark {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-accent);
}

.logo-text {
  opacity: 0.7;
  font-size: 0.875rem;
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switch {
  display: flex;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  overflow: hidden;
}

.lang-switch button {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.lang-switch button.active {
  background: var(--color-accent);
  color: #0a0a0a;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
  border-radius: 2px;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  top: -30%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-family: var(--font-mono);
  font-size: 0.813rem;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.hero-title span {
  display: inline;
}

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

.accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 40px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  gap: 48px;
}

.hero-stat {
  display: flex;
  flex-direction: column;
}

.hero-stat-number {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.hero-stat-label {
  font-size: 0.813rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

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

/* ============================================
   ABOUT
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}

.about-image-wrapper {
  position: relative;
}

.about-image-wrapper img {
  border-radius: var(--radius-lg);
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
}

.about-image-border {
  position: absolute;
  inset: -8px;
  border: 2px solid var(--color-accent);
  border-radius: calc(var(--radius-lg) + 4px);
  opacity: 0.3;
  pointer-events: none;
}

.about-text {
  font-size: 1.063rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-highlight {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.about-highlight-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 158, 11, 0.08);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
}

.about-highlight h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.about-highlight p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================
   SKILLS
   ============================================ */
.skills-bars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 48px;
  margin-bottom: 64px;
}

.skill-bar-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skill-bar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skill-bar-name {
  font-weight: 700;
  font-size: 0.938rem;
  color: #fff;
}

.skill-bar-track {
  height: 6px;
  background: var(--color-border-dark);
  border-radius: 100px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: 100px;
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.skill-card {
  background: var(--color-surface-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
}

.skill-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.skill-card-icon {
  color: var(--color-accent);
  margin-bottom: 16px;
}

.skill-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-accent-light);
  border-radius: 100px;
  border: 1px solid rgba(245, 158, 11, 0.15);
}

.domains {
  padding-top: 32px;
  border-top: 1px solid var(--color-border-dark);
}

.domains h3 {
  font-family: var(--font-mono);
  font-size: 0.813rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dark-secondary);
  margin-bottom: 16px;
}

.domain-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.domain-tags span {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 20px;
  background: transparent;
  color: var(--color-text-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: 100px;
  transition: var(--transition);
}

.domain-tags span:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================
   EXPERIENCE
   ============================================ */
.timeline {
  position: relative;
  padding-left: 40px;
  margin-bottom: 80px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-accent);
  z-index: 1;
}

.timeline-item:first-child .timeline-marker {
  background: var(--color-accent);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.813rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.timeline-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-content h4 {
  font-size: 0.938rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.timeline-content p {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 600px;
}

.education h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.education-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.education-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.education-year {
  font-family: var(--font-mono);
  font-size: 0.813rem;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.education-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.education-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ============================================
   SERVICES
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.service-card {
  background: var(--color-surface-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.service-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.service-number {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 900;
  position: absolute;
  top: -8px;
  right: 16px;
  color: rgba(255, 255, 255, 0.03);
  line-height: 1;
  pointer-events: none;
}

.service-icon {
  color: var(--color-accent);
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.938rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.7;
}

.availability-banner {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px 28px;
  background: rgba(245, 158, 11, 0.06);
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: var(--radius);
}

.availability-dot {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-top: 6px;
  animation: dot-pulse 2s ease-in-out infinite;
}

@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.availability-banner p {
  font-size: 0.938rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.6;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-text p {
  font-size: 1.063rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 16px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.938rem;
  transition: var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateX(4px);
}

.contact-link svg {
  flex-shrink: 0;
  color: var(--color-accent);
}

.contact-card {
  position: sticky;
  top: 100px;
}

.contact-card-inner {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.contact-card-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  margin-top: 24px;
}

.contact-card-label:first-child {
  margin-top: 0;
}

.contact-card-inner p {
  font-size: 0.938rem;
  font-weight: 500;
  color: var(--color-text);
}

.contact-card-inner a {
  color: var(--color-accent);
  transition: var(--transition);
}

.contact-card-inner a:hover {
  color: var(--color-accent-light);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-weight: 600;
  font-size: 0.938rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-meta {
  display: flex;
  gap: 24px;
  font-size: 0.813rem;
  color: var(--color-text-secondary);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.footer-social a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================
   ANIMATIONS (scroll reveal)
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.3s; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }

  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(250, 250, 250, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    z-index: 999;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .hero-stats {
    gap: 32px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-wrapper img {
    max-width: 280px;
    margin: 0 auto;
  }

  .about-image-border {
    display: none;
  }

  .skills-bars {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .education-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-meta {
    flex-direction: column;
    gap: 4px;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

  .hero-stat {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
  }

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

  .btn {
    justify-content: center;
    width: 100%;
  }
}