/* ==========================================================================
   Nicholas Kadunce — Personal Site
   Immersive, Tesla/SpaceX-inspired design
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Monochromatic foundation */
  --bg: #000000;
  --bg-secondary: #0a0a0a;
  --bg-tertiary: #111111;
  --text: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-tertiary: rgba(255, 255, 255, 0.5);

  /* Accent */
  --accent: #0071e3;
  --accent-hover: #0077ed;

  /* Surfaces */
  --card-bg: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.2);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);

  /* Layout */
  --max-width: 1200px;
  --content-width: 800px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 48px;
  --spacing-xl: 80px;
  --spacing-2xl: 120px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Monaco, monospace;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
  --duration: 0.4s;
  --duration-slow: 0.8s;
  --duration-slower: 1.2s;

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

/* Light mode override */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #e8e8ed;
    --text: #1d1d1f;
    --text-secondary: rgba(0, 0, 0, 0.6);
    --text-tertiary: rgba(0, 0, 0, 0.4);
    --card-bg: rgba(0, 0, 0, 0.03);
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.15);
  }
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h1 {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

.text-large {
  font-size: clamp(20px, 2.5vw, 28px);
  line-height: 1.4;
  font-weight: 400;
}

.text-small {
  font-size: 14px;
}

.text-mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.text-muted {
  color: var(--text-secondary);
}

.text-tertiary {
  color: var(--text-tertiary);
}

.text-center {
  text-align: center;
}

/* --------------------------------------------------------------------------
   Links & Buttons
   -------------------------------------------------------------------------- */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--duration) var(--ease-out);
}

a:hover {
  color: var(--accent-hover);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
  text-decoration: none;
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
}

.btn-primary:hover {
  transform: scale(1.02);
  opacity: 0.9;
  color: var(--bg);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  background: var(--card-bg);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  padding: 8px 0;
  font-weight: 500;
}

.btn-ghost::after {
  content: " →";
  transition: transform var(--duration) var(--ease-out);
  display: inline-block;
}

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

.btn-ghost:hover::after {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section {
  padding: var(--spacing-xl) 0;
}

.section-lg {
  padding: var(--spacing-2xl) 0;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  transition: transform var(--duration) var(--ease-out);
}

@media (prefers-color-scheme: light) {
  .nav {
    background: rgba(255, 255, 255, 0.8);
  }
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.nav-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-brand:hover {
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  transition: all var(--duration) var(--ease-out);
}

.nav-links a:hover {
  color: var(--text);
  background: var(--card-bg);
}

main {
  padding-top: 56px;
}

/* --------------------------------------------------------------------------
   Hero — Full Viewport
   -------------------------------------------------------------------------- */
.hero {
  min-height: calc(100vh - 56px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero p {
  margin: 0 auto var(--spacing-lg);
  max-width: 600px;
  color: var(--text-secondary);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-tertiary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  animation: bounce 2s infinite;
}

.scroll-indicator::after {
  content: "";
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-tertiary), transparent);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* --------------------------------------------------------------------------
   Stats
   -------------------------------------------------------------------------- */
.stats-section {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

@media (max-width: 768px) {
  .stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

.stat {
  text-align: center;
  padding: var(--spacing-md);
}

.stat-value {
  font-size: clamp(48px, 8vw, 72px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--duration) var(--ease-out);
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-link:hover {
  color: inherit;
}

.card h3 {
  color: var(--text);
  margin-bottom: var(--spacing-sm);
}

.card p {
  margin: 0;
  font-size: 15px;
}

.card-meta {
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* --------------------------------------------------------------------------
   Experience — Full Viewport Slides
   -------------------------------------------------------------------------- */
.experience-section {
  position: relative;
}

/* Timeline connector */
.experience-timeline {
  position: fixed;
  right: var(--spacing-lg);
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.timeline-track {
  width: 2px;
  height: 200px;
  background: var(--border);
  position: relative;
}

.timeline-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: var(--text);
  transition: height 0.3s ease-out;
}

.timeline-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border);
  transition: all var(--duration) var(--ease-out);
  cursor: pointer;
}

.timeline-dot.active {
  background: var(--text);
  border-color: var(--text);
  transform: scale(1.2);
}

.timeline-dot:hover {
  border-color: var(--text);
}

@media (max-width: 1024px) {
  .experience-timeline {
    display: none;
  }
}

/* Experience slide */
.experience-slide {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.experience-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.experience-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.experience-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.3) 0%,
    rgba(0, 0, 0, 0.6) 50%,
    rgba(0, 0, 0, 0.8) 100%
  );
}

@media (prefers-color-scheme: light) {
  .experience-bg img {
    opacity: 0.3;
  }
  .experience-bg::after {
    background: linear-gradient(
      to bottom,
      rgba(255, 255, 255, 0.5) 0%,
      rgba(255, 255, 255, 0.7) 50%,
      rgba(255, 255, 255, 0.9) 100%
    );
  }
}

.experience-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.experience-meta {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
  padding: 8px 16px;
  background: var(--card-bg);
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

.experience-title {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text);
}

.experience-company {
  font-size: clamp(18px, 2.5vw, 24px);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.experience-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  text-align: left;
  max-width: 600px;
  margin: 0 auto;
}

.experience-highlight {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.highlight-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.highlight-icon::after {
  content: "✓";
  color: white;
  font-size: 12px;
  font-weight: 700;
}

.experience-highlight p {
  color: var(--text);
  font-size: 17px;
  line-height: 1.5;
  margin: 0;
  max-width: none;
}

.experience-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.experience-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--card-bg);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   Section Connector
   -------------------------------------------------------------------------- */
.section-connector {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.connector-line {
  width: 2px;
  height: 100%;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--border) 20%,
    var(--border) 80%,
    transparent
  );
}

.connector-dot {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* --------------------------------------------------------------------------
   Tags / Pills
   -------------------------------------------------------------------------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--card-bg);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.contact-section {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl) var(--spacing-md);
}

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

.contact-content h2 {
  margin-bottom: var(--spacing-md);
}

.contact-content > p {
  margin: 0 auto var(--spacing-lg);
}

.contact-grid {
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
  flex-wrap: wrap;
}

.contact-item {
  text-align: center;
}

.contact-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.contact-value {
  font-size: 17px;
}

.contact-value a {
  color: var(--text);
  transition: color var(--duration) var(--ease-out);
}

.contact-value a:hover {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   Scroll Reveal Animations
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

.reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0.1s; }
.reveal-stagger.revealed > *:nth-child(2) { transition-delay: 0.2s; }
.reveal-stagger.revealed > *:nth-child(3) { transition-delay: 0.3s; }
.reveal-stagger.revealed > *:nth-child(4) { transition-delay: 0.4s; }
.reveal-stagger.revealed > *:nth-child(5) { transition-delay: 0.5s; }

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

/* Scale reveal */
.reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

/* Slide from sides */
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

.reveal-left.revealed,
.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Mobile Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .hero {
    min-height: calc(100vh - 56px);
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .hero h1 {
    font-size: clamp(36px, 10vw, 48px);
  }

  .nav-links {
    gap: var(--spacing-xs);
  }

  .nav-links a {
    padding: 8px 12px;
    font-size: 13px;
  }

  .experience-slide {
    min-height: auto;
    padding: var(--spacing-2xl) 0;
  }

  .experience-content {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .experience-highlights {
    gap: var(--spacing-sm);
  }

  .experience-highlight {
    gap: var(--spacing-sm);
  }

  .experience-highlight p {
    font-size: 15px;
  }

  .contact-grid {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .stats {
    gap: var(--spacing-md);
  }

  .stat-value {
    font-size: clamp(40px, 12vw, 56px);
  }
}

/* --------------------------------------------------------------------------
   Initial page load animation
   -------------------------------------------------------------------------- */
.hero h1,
.hero p,
.hero-buttons {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s var(--ease-out-expo) forwards;
}

.hero h1 { animation-delay: 0.1s; }
.hero p { animation-delay: 0.2s; }
.hero-buttons { animation-delay: 0.3s; }

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