/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-tertiary: #1a1a24;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);

  --purple: #a855f7;
  --purple-glow: rgba(168, 85, 247, 0.15);
  --cyan: #22d3ee;
  --cyan-glow: rgba(34, 211, 238, 0.15);
  --green: #10b981;
  --green-glow: rgba(16, 185, 129, 0.15);

  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-muted: #6b6b80;

  --gradient-main: linear-gradient(135deg, var(--purple), var(--cyan));
  --gradient-alt: linear-gradient(135deg, var(--cyan), var(--green));

  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: 16px;

  --font-primary: 'Spline Sans', sans-serif;

  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background: var(--purple);
  color: #fff;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* ========================================
   Utilities
   ======================================== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 32px rgba(168, 85, 247, 0.08);
  transform: translateY(-4px);
}

.gradient-border {
  padding: 2px;
  background: var(--gradient-main);
  border-radius: var(--radius-xl);
}

.gradient-border > img {
  border-radius: calc(var(--radius-xl) - 2px);
  display: block;
  width: 100%;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 48px;
  text-align: center;
}

.btn {
  display: inline-block;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  padding: 16px 40px;
  border-radius: 50px;
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 30px var(--purple-glow);
}

/* ========================================
   Scroll Animations
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in.stagger:nth-child(1) { transition-delay: 0.05s; }
.fade-in.stagger:nth-child(2) { transition-delay: 0.1s; }
.fade-in.stagger:nth-child(3) { transition-delay: 0.15s; }
.fade-in.stagger:nth-child(4) { transition-delay: 0.2s; }
.fade-in.stagger:nth-child(5) { transition-delay: 0.25s; }
.fade-in.stagger:nth-child(6) { transition-delay: 0.3s; }
.fade-in.stagger:nth-child(7) { transition-delay: 0.35s; }
.fade-in.stagger:nth-child(8) { transition-delay: 0.4s; }
.fade-in.stagger:nth-child(9) { transition-delay: 0.45s; }
.fade-in.stagger:nth-child(10) { transition-delay: 0.5s; }
.fade-in.stagger:nth-child(11) { transition-delay: 0.55s; }
.fade-in.stagger:nth-child(12) { transition-delay: 0.6s; }

/* ========================================
   Navigation
   ======================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.site-nav.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--glass-border);
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: width var(--transition-fast);
}

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

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

.nav-cta {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 600;
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 20px var(--purple-glow);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

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

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

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

/* ========================================
   Hero
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 72px 24px 40px;
  position: relative;
  overflow: hidden;
  max-width: none;
}

.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero-greeting {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 32px;
}

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

.scroll-arrow {
  display: block;
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 0.4; }
  50% { transform: rotate(45deg) translate(6px, 6px); opacity: 1; }
}

/* ========================================
   About
   ======================================== */
.about {
  background: var(--bg-secondary);
  padding: 120px 0;
  max-width: none;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 60px;
}

.about-lead {
  font-size: 1.3rem;
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 20px;
  line-height: 1.6;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 16px;
}

.about-image .image-wrapper {
  overflow: hidden;
}

.about-image img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 32px 24px;
}

.stat-value {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

/* ========================================
   Skills
   ======================================== */
.skills {
  padding: 120px 0;
  background: var(--bg-primary);
  max-width: none;
}

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

.skill-card {
  text-align: center;
  padding: 32px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.skill-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-icon svg {
  width: 35px;
  height: 35px;
  stroke: var(--purple);
  transition: stroke var(--transition-fast);
}

.skill-card:hover .skill-icon svg {
  stroke: var(--cyan);
}

.skill-name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ========================================
   Projects
   ======================================== */
.projects {
  padding: 120px 0;
  background: var(--bg-secondary);
  max-width: none;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  overflow: hidden;
}

.project-card.featured {
  grid-column: span 2;
}

.project-image {
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.project-image img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.project-card.featured .project-image img {
  height: 280px;
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-info {
  padding: 24px;
}

.project-info h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.project-info p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.78rem;
  padding: 5px 14px;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: 50px;
  color: var(--purple);
  font-weight: 500;
}

/* ========================================
   Experience / Timeline
   ======================================== */
.experience {
  padding: 120px 0;
  background: var(--bg-primary);
  max-width: none;
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: var(--gradient-main);
  opacity: 0.3;
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 40px 60px;
}

.timeline-item.timeline-left {
  left: 0;
  text-align: right;
  padding-right: 40px;
  padding-left: 0;
}

.timeline-item.timeline-right {
  left: 50%;
  text-align: left;
  padding-left: 40px;
  padding-right: 0;
}

.timeline-dot {
  position: absolute;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--purple);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
}

.timeline-item.timeline-left .timeline-dot {
  right: -7px;
}

.timeline-item.timeline-right .timeline-dot {
  left: -7px;
}

.timeline-dot.current {
  box-shadow: 0 0 0 4px var(--purple-glow), 0 0 20px var(--purple-glow);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--purple-glow), 0 0 20px var(--purple-glow); }
  50% { box-shadow: 0 0 0 8px rgba(168, 85, 247, 0.08), 0 0 30px var(--purple-glow); }
}

.timeline-card {
  padding: 28px;
}

.timeline-period {
  font-size: 0.85rem;
  color: var(--cyan);
  font-weight: 600;
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: 8px;
}

.timeline-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-card h4 {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 12px;
}

.timeline-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   Testimonials
   ======================================== */
.testimonials {
  padding: 120px 0;
  background: var(--bg-secondary);
  max-width: none;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  padding: 36px 28px;
  position: relative;
}

.quote-mark {
  font-size: 4rem;
  line-height: 1;
  display: block;
  margin-bottom: 8px;
  font-family: Georgia, serif;
}

.testimonial-card blockquote {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.testimonial-author strong {
  font-size: 0.95rem;
  color: var(--text-primary);
}

.testimonial-author span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========================================
   Contact
   ======================================== */
.contact {
  padding: 120px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
  max-width: none;
}

.contact-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.contact .container {
  position: relative;
  z-index: 1;
}

.contact-text {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 32px;
}

.contact-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.contact-links a:hover {
  color: var(--cyan);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--bg-secondary);
  padding-top: 0;
}

.footer-gradient-border {
  height: 1px;
  background: var(--gradient-main);
  opacity: 0.3;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding: 60px 0 40px;
}

.footer-brand .nav-logo {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 2rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-links h4,
.footer-social h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-links a,
.footer-social a {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--glass-border);
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

  .project-card.featured {
    grid-column: span 1;
  }

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

  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 10, 15, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
  }

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

  .nav-link {
    font-size: 1.4rem;
  }

  .nav-cta {
    font-size: 1rem;
  }

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

  .about-image {
    order: -1;
    max-width: 300px;
    margin: 0 auto;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .stat-card {
    padding: 24px 16px;
  }

  .stat-value {
    font-size: 1.8rem;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 50px;
    padding-right: 0;
    text-align: left;
  }

  .timeline-item.timeline-left {
    left: 0;
    text-align: left;
    padding-left: 50px;
  }

  .timeline-item.timeline-right {
    left: 0;
    padding-left: 50px;
  }

  .timeline-item.timeline-left .timeline-dot,
  .timeline-item.timeline-right .timeline-dot {
    left: 13px;
    right: auto;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .section-title {
    margin-bottom: 36px;
  }

  .about,
  .skills,
  .projects,
  .experience,
  .testimonials,
  .contact {
    padding: 80px 0;
  }
}

@media (max-width: 480px) {
  .about-stats {
    grid-template-columns: 1fr;
  }

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

  .contact-links {
    flex-direction: column;
    gap: 16px;
  }

  .hero-tagline {
    font-size: 0.95rem;
  }
}