/* ============================================
   CSS Custom Properties
   ============================================ */
:root {
  /* Colors */
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --text-primary: #e8e6e3;
  --text-secondary: #9a9a9a;
  --accent: #c9b99a;
  --accent-dim: rgba(201, 185, 154, 0.15);
  --border: rgba(255, 255, 255, 0.06);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  /* Spacing */
  --section-padding: 8rem 0;
  --container-width: 960px;
  --container-padding: 0 2rem;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.5rem 0;
  transition: background-color 0.4s var(--ease-out),
              padding 0.4s var(--ease-out),
              backdrop-filter 0.4s var(--ease-out);
}

.nav.scrolled {
  background-color: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

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

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  transition: color 0.3s var(--ease-out);
}

.nav-logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.3s var(--ease-out);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent);
  transition: width 0.3s var(--ease-out);
}

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

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

/* Mobile toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--text-primary);
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  position: relative;
}

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

.hero-greeting {
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  letter-spacing: 0.02em;
}

.hero-cta {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.85rem 2.25rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 0;
  transition: all 0.4s var(--ease-out);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--bg-primary);
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent);
}

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

.btn-outline:hover {
  border-color: var(--text-secondary);
  color: var(--accent);
}

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.hero-scroll-indicator span {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-secondary), transparent);
  animation: scrollPulse 2s var(--ease-in-out) infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: var(--section-padding);
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 3.5rem;
}

/* ============================================
   About
   ============================================ */
.about-content {
  max-width: 640px;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.85;
}

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

/* ============================================
   Experience / Timeline
   ============================================ */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}

.timeline-item {
  position: relative;
  padding-bottom: 3.5rem;
}

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

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 0.4rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent);
  transform: translateX(-3px);
}

.timeline-date {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}

.timeline-role {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 400;
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.timeline-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 560px;
}

/* ============================================
   Education
   ============================================ */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.education-card {
  padding: 2rem;
  border: 1px solid var(--border);
  transition: border-color 0.4s var(--ease-out), transform 0.4s var(--ease-out);
}

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

.education-degree {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: 0.35rem;
}

.education-school {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.education-year {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ============================================
   Skills
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 3rem;
}

.skill-category-title {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.skill-list li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 0.4rem 0;
  transition: color 0.3s var(--ease-out);
}

.skill-list li:hover {
  color: var(--text-primary);
}

/* ============================================
   Contact
   ============================================ */
.contact-content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.contact-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  color: var(--text-secondary);
  transition: color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.contact-link:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.contact-link svg {
  width: 24px;
  height: 24px;
}

.contact-link span {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 3rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer p {
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

/* ============================================
   Reveal Animations
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s var(--ease-out) forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

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

/* Scroll-triggered reveals */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

/* Stagger children */
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }

/* ============================================
   Responsive — Tablet
   ============================================ */
@media (max-width: 768px) {
  :root {
    --section-padding: 5rem 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(10, 10, 11, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease-out);
  }

  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    font-size: 1rem;
    letter-spacing: 0.12em;
  }

  .hero {
    padding: 8rem 1.5rem 4rem;
  }

  .hero-name {
    font-size: clamp(2.2rem, 10vw, 3.2rem);
  }

  .section-title {
    margin-bottom: 2.5rem;
  }

  .timeline {
    padding-left: 2rem;
  }

  .timeline-marker {
    left: -2rem;
  }

  .contact-links {
    gap: 2rem;
  }
}

/* ============================================
   Responsive — Small Mobile
   ============================================ */
@media (max-width: 480px) {
  :root {
    --section-padding: 4rem 0;
    --container-padding: 0 1.25rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 260px;
    text-align: center;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

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