/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
  /* Colors */
  --color-bg-primary: #0a0f1c;
  --color-bg-secondary: #111827;
  --color-bg-card: rgba(17, 24, 39, 0.7);
  --color-bg-card-hover: rgba(30, 41, 59, 0.8);
  --color-surface: #1e293b;
  --color-border: rgba(99, 132, 255, 0.15);
  --color-border-hover: rgba(99, 132, 255, 0.35);

  --color-accent: #6384ff;
  --color-accent-light: #818cf8;
  --color-accent-glow: rgba(99, 132, 255, 0.25);
  --color-accent-gradient: linear-gradient(135deg, #6384ff 0%, #a78bfa 100%);

  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --section-padding: 6rem 0;
  --container-width: 1140px;
  --container-padding: 0 1.5rem;

  /* Effects */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 40px var(--color-accent-glow);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s 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;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

ul {
  list-style: none;
}

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

/* ========================================
   Background Grid / Gradient Decoration
   ======================================== */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 132, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(167, 139, 250, 0.06), transparent);
  pointer-events: none;
  z-index: 0;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition-base);
  backdrop-filter: blur(0px);
  background: transparent;
}

.navbar.scrolled {
  padding: 0.6rem 0;
  background: rgba(10, 15, 28, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

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

.nav-links a {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--transition-base);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  transition: width var(--transition-base);
  border-radius: 1px;
}

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

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

.lang-btn {
  background: var(--color-accent-gradient);
  color: #fff;
  border: none;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  letter-spacing: 0.05em;
}

.lang-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition-base);
}

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

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

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1;
  padding-top: 5rem;
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-greeting {
  font-size: var(--text-lg);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.7s 0.2s forwards;
}

.hero-name {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #f1f5f9 0%, #c7d2fe 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.7s 0.4s forwards;
}

.hero-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.7s 0.6s forwards;
}

.hero-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.7s 0.8s forwards;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.7s 1s forwards;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent-gradient);
  color: #fff;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: var(--transition-base);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--color-accent);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  border: 1.5px solid var(--color-border-hover);
  transition: var(--transition-base);
  cursor: pointer;
}

.btn-outline:hover {
  background: rgba(99, 132, 255, 0.08);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

/* Profile Image */
.hero-image {
  flex-shrink: 0;
  position: relative;
  opacity: 0;
  transform: scale(0.9);
  animation: fadeInScale 0.8s 0.6s forwards;
}

.profile-pic-wrapper {
  width: 320px;
  height: 320px;
  border-radius: 50%;
  padding: 4px;
  background: var(--color-accent-gradient);
  position: relative;
}

.profile-pic-wrapper::after {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  border: 1.5px dashed var(--color-border-hover);
  animation: spin 30s linear infinite;
}

.profile-pic-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-bg-primary);
}

/* ========================================
   Section Shared Styles
   ======================================== */
section {
  position: relative;
  z-index: 1;
}

.section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #f1f5f9 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-line {
  width: 60px;
  height: 3px;
  background: var(--color-accent-gradient);
  border-radius: 2px;
  margin: 0 auto;
}

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

.about-text {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.skills-grid {
  display: grid;
  gap: 1.25rem;
}

.skill-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: var(--transition-base);
}

.skill-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.skill-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.35rem;
}

.skill-value {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ========================================
   Education Section
   ======================================== */
.education-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 700px;
  margin: 0 auto;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.education-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-accent-gradient);
}

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

.edu-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.edu-school {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.edu-date {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
  background: rgba(99, 132, 255, 0.1);
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.edu-degree {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.edu-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ========================================
   Experience Section
   ======================================== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), rgba(99, 132, 255, 0.1));
}

.timeline-item {
  position: relative;
  padding-left: 64px;
  margin-bottom: 2.5rem;
}

.timeline-dot {
  position: absolute;
  left: 16px;
  top: 8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-bg-primary);
  border: 3px solid var(--color-accent);
  z-index: 1;
  transition: var(--transition-base);
}

.timeline-item:hover .timeline-dot {
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.timeline-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: var(--transition-base);
}

.timeline-card:hover {
  border-color: var(--color-border-hover);
  transform: translateX(6px);
  box-shadow: var(--shadow-card);
}

.exp-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.exp-company {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.15rem;
}

.exp-date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: 0.85rem;
}

.exp-bullets {
  padding-left: 1.25rem;
}

.exp-bullets li {
  list-style: disc;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

.exp-bullets li::marker {
  color: var(--color-accent);
}

/* ========================================
   Projects Section
   ======================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.75rem;
}

.project-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-base);
  transform-origin: left;
}

.project-card:hover::before {
  transform: scaleX(1);
}

.project-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.project-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 132, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.25rem;
}

.project-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.project-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag {
  font-size: var(--text-xs);
  background: rgba(99, 132, 255, 0.1);
  color: var(--color-accent-light);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-weight: 500;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-content {
  text-align: center;
  max-width: 550px;
  margin: 0 auto;
}

.contact-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
}

.contact-cards {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  text-align: center;
  transition: var(--transition-base);
  flex: 1;
  min-width: 200px;
}

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

.contact-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.contact-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.contact-value a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  word-break: break-all;
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  position: relative;
  z-index: 1;
}

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

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

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Scroll reveal (controlled via JS) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 992px) {
  .hero .container {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .profile-pic-wrapper {
    width: 240px;
    height: 240px;
  }

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

  .hero-name {
    font-size: var(--text-5xl);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 4rem 0;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(10, 15, 28, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
    transition: right var(--transition-base);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.open {
    right: 0;
  }

  .hamburger {
    display: flex;
  }

  .hero-name {
    font-size: var(--text-4xl);
  }

  .section-title {
    font-size: var(--text-3xl);
  }

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

  .timeline::before {
    left: 16px;
  }

  .timeline-item {
    padding-left: 48px;
  }

  .timeline-dot {
    left: 8px;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: var(--text-3xl);
  }

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

  .contact-cards {
    flex-direction: column;
  }

  .education-card {
    padding: 1.5rem;
  }
}