/* ============================================
   Design Tokens — Light Theme
   ============================================ */
:root {
  --bg-deep: #f8fafc;
  --bg-surface: #ffffff;

  --blue-accent: #2563eb;
  --blue-glow: #60a5fa;
  --blue-muted: #93c5fd;
  --blue-bright: #1d4ed8;
  --blue-soft: #eff6ff;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-tertiary: #475569;
  --text-faint: #64748b;

  --neutral-100: #f1f5f9;
  --neutral-200: #cbd5e1;
  --neutral-300: #94a3b8;
  --neutral-400: #64748b;
  --neutral-600: #334155;
  --neutral-800: #0f172a;

  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(37, 99, 235, 0.1);
  --glass-highlight: rgba(37, 99, 235, 0.04);

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);

  --font-heading: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
}

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

ul {
  list-style: none;
}

/* ============================================
   Background UI Decorations
   ============================================ */
.bg-ui {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 80%);
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 20s infinite alternate ease-in-out;
}

.orb-1 {
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: var(--blue-soft);
  animation-delay: 0s;
}

.orb-2 {
  bottom: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: var(--blue-muted);
  opacity: 0.2;
  animation-delay: -5s;
}

.orb-3 {
  top: 40%;
  left: 60%;
  width: 40vw;
  height: 40vw;
  background: var(--blue-glow);
  opacity: 0.15;
  animation-delay: -10s;
}

.ui-accent {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.ui-top-left {
  top: 2rem;
  left: 2rem;
  border-right: none;
  border-bottom: none;
}

.ui-top-right {
  top: 2rem;
  right: 2rem;
  border-left: none;
  border-bottom: none;
}

.ui-bottom-left {
  bottom: 2rem;
  left: 2rem;
  border-right: none;
  border-top: none;
}

.ui-bottom-right {
  bottom: 2rem;
  right: 2rem;
  border-left: none;
  border-top: none;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(5%, 5%) scale(1.05); }
  66% { transform: translate(-2%, 8%) scale(0.95); }
  100% { transform: translate(-5%, -2%) scale(1); }
}

/* ============================================
   Three.js Canvas
   ============================================ */
#three-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* ============================================
   Content Wrapper (sits above canvas)
   ============================================ */
.content-wrapper {
  position: relative;
  z-index: 1;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 780px;
  height: 56px;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1.8rem;
  z-index: 1000;
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 4px 30px rgba(15, 23, 42, 0.08);
}

.nav-brand {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-brand span {
  color: var(--blue-accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-tertiary);
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--blue-accent);
  transition: width 0.3s var(--ease-out-expo);
}

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

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

.nav-social {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav-social a {
  color: var(--text-tertiary);
  font-size: 1.1rem;
  transition: color 0.3s ease, transform 0.3s ease;
}

.nav-social a:hover {
  color: var(--blue-accent);
  transform: translateY(-1px);
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* ============================================
   Sections — General
   ============================================ */
section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 2rem 4rem;
  position: relative;
}

.section-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--blue-accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--blue-accent);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2rem;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

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

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

.hero-greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--blue-accent);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.2s forwards;
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.4s forwards;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.6s forwards;
}

.hero-location {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-faint);
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.75s forwards;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.9s forwards;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--blue-accent);
  color: #ffffff;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease, background 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--blue-bright);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--neutral-300);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  border-color: var(--blue-accent);
  color: var(--blue-accent);
  background: var(--blue-soft);
}

.scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-faint);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 1.2s forwards;
}

.scroll-indicator .chevron {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--text-faint);
  border-bottom: 2px solid var(--text-faint);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-bio {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

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

.resume-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
  padding: 0.7rem 1.5rem;
  background: transparent;
  color: var(--blue-accent);
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid var(--blue-accent);
  border-radius: 50px;
  transition: all 0.3s ease;
}

.resume-btn:hover {
  background: var(--blue-soft);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.12);
}

.resume-btn i {
  transition: transform 0.3s ease;
}

.resume-btn:hover i {
  transform: translateX(3px);
}

/* Skills */
.skills-panel {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.skills-category {
  margin-bottom: 1.5rem;
}

.skills-category:last-child {
  margin-bottom: 0;
}

.skills-category-title {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-faint);
  margin-bottom: 0.75rem;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: var(--blue-soft);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--blue-bright);
  transition: all 0.3s ease;
}

.skill-tag:hover {
  background: rgba(37, 99, 235, 0.12);
  border-color: rgba(37, 99, 235, 0.25);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

/* ============================================
   Projects Section
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 16px;
  padding: 2rem;
  transition: all 0.4s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue-accent), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.18);
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.1), 0 0 0 1px rgba(37, 99, 235, 0.06);
}

.project-card:hover::before {
  opacity: 1;
}

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

.project-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--blue-soft);
  border: 1px solid rgba(37, 99, 235, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-accent);
  font-size: 1.2rem;
}

.project-card-link {
  color: var(--text-faint);
  font-size: 1.1rem;
  transition: color 0.3s ease, transform 0.3s ease;
}

.project-card:hover .project-card-link {
  color: var(--blue-accent);
  transform: translate(3px, -3px);
}

.project-card-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.project-card-desc {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tag {
  padding: 0.25rem 0.65rem;
  background: var(--blue-soft);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 14px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-tertiary);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue-accent), var(--neutral-300), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 3rem;
}

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

.timeline-dot {
  position: absolute;
  left: -45px;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--blue-accent);
  box-shadow: 0 0 8px rgba(37, 99, 235, 0.2);
  z-index: 1;
}

.timeline-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 16px;
  padding: 1.75rem;
  transition: all 0.4s var(--ease-out-expo);
  box-shadow: var(--shadow-sm);
}

.timeline-card:hover {
  border-color: rgba(37, 99, 235, 0.15);
  box-shadow: var(--shadow-md);
}

.timeline-role {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.timeline-company {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--blue-accent);
  margin-bottom: 0.75rem;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  line-height: 1.65;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
  min-height: 60vh;
}

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

.contact-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.contact-text {
  font-size: 1.05rem;
  color: var(--text-tertiary);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.contact-link:hover {
  border-color: var(--blue-accent);
  color: var(--blue-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.1);
}

.footer-line {
  padding-top: 2rem;
  border-top: 1px solid var(--neutral-200);
  font-size: 0.8rem;
  color: var(--text-faint);
}

/* ============================================
   Scroll Reveal Animations
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.reveal.visible {
  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; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ============================================
   Keyframe Animations
   ============================================ */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollBounce {
  0%, 100% {
    transform: rotate(45deg) translateY(0);
    opacity: 0.5;
  }
  50% {
    transform: rotate(45deg) translateY(6px);
    opacity: 1;
  }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .navbar {
    width: 94%;
    padding: 0 1.2rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 1rem);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
  }

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

  .menu-toggle {
    display: block;
  }

  section {
    padding: 6rem 1.25rem 3rem;
  }

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

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

  .hero-name {
    font-size: clamp(2.2rem, 10vw, 3.5rem);
  }

  .timeline {
    padding-left: 2rem;
  }

  .timeline-dot {
    left: -37px;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    max-width: 260px;
    justify-content: center;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}