/* ==========================================================================
   Base Design System & CSS Reset
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Colors - Dark Mode Default (Elegant Pastel Dark) */
  --bg-primary: #121217;
  --bg-secondary: #1a1a24;
  --bg-tertiary: #222232;
  --accent-primary: #b39ddb;
  /* Soft Pastel Purple */
  --accent-secondary: #80deea;
  /* Soft Pastel Teal */
  --accent-glow: rgba(179, 157, 219, 0.15);
  --text-primary: #e2e2e9;
  --text-secondary: #a7a7b8;
  --text-muted: #727288;
  --border-color: rgba(255, 255, 255, 0.05);
  --glass-bg: rgba(26, 26, 36, 0.7);
  --glass-border: rgba(255, 255, 255, 0.03);
  --hero-gradient: linear-gradient(135deg, #e2e2e9 10%, #b39ddb 50%, #80deea 100%);
  --logo-gradient: linear-gradient(135deg, #ffffff 0%, var(--text-secondary) 100%);

  /* Fonts */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  scroll-behavior: smooth;
}

body.light-mode {
  /* Colors - Light Mode (Soft Pastel Light) */
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #edeef4;
  --accent-primary: #9575cd;
  /* Richer Pastel Violet */
  --accent-secondary: #4dd0e1;
  /* Richer Pastel Cyan */
  --accent-glow: rgba(149, 117, 205, 0.1);
  --text-primary: #2d2d3a;
  --text-secondary: #5e5e70;
  --text-muted: #9a9aab;
  --border-color: rgba(0, 0, 0, 0.06);
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(0, 0, 0, 0.03);
  --hero-gradient: linear-gradient(135deg, #2d2d3a 10%, #9575cd 50%, #4dd0e1 100%);
  --logo-gradient: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1.25rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.language-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 700;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
  font-family: var(--font-heading);
}

.language-toggle-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Glassmorphism utility */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ==========================================================================
   Layout & Sections
   ========================================================================== */

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: var(--transition-normal);
}

header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--logo-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.logo span {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: var(--transition-fast);
}

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

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

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 2rem 4rem;
  overflow: hidden;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(138, 43, 226, 0.1);
  border: 1px solid rgba(138, 43, 226, 0.3);
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  color: #c084fc;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  animation: pulse 2s infinite alternate;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(138, 43, 226, 0.4);
  }

  100% {
    transform: scale(1.03);
    box-shadow: 0 0 12px 4px rgba(138, 43, 226, 0.1);
  }
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

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

.hero-desc {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 3rem;
  font-weight: 300;
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: var(--transition-normal);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: white;
  border: none;
  box-shadow: 0 4px 20px rgba(138, 43, 226, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(138, 43, 226, 0.5);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

/* Sections Global */
section {
  padding: 7rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

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

.section-subtitle {
  color: var(--accent-primary);
  text-transform: uppercase;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
}

/* Experience Timeline */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 31px;
  top: 0;
  height: 100%;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-primary) 0%, var(--accent-secondary) 50%, var(--bg-tertiary) 100%);
}

.timeline-item {
  position: relative;
  padding-left: 5.5rem;
  margin-bottom: 4rem;
}

.timeline-dot {
  position: absolute;
  left: 20px;
  top: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 4px solid var(--accent-primary);
  z-index: 2;
  box-shadow: 0 0 10px var(--accent-primary);
  transition: var(--transition-normal);
}

.timeline-item:hover .timeline-dot {
  background: var(--accent-primary);
  transform: scale(1.2);
}

.timeline-date {
  color: var(--accent-primary);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.timeline-card {
  padding: 2rem;
  border-radius: 12px;
  transition: var(--transition-normal);
}

.timeline-card:hover {
  transform: translateY(-4px);
  border-color: rgba(138, 43, 226, 0.3);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-company {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.timeline-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.timeline-bullets {
  list-style: none;
}

.timeline-bullets li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.timeline-bullets li::before {
  content: '•';
  color: var(--accent-primary);
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* Image container for mockups */
.project-image-container {
  width: 100%;
  height: 380px;
  overflow: hidden;
  position: relative;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-slow);
}

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

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
}

.project-card {
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition-slow);
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--border-color);
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-primary);
  box-shadow: 0 20px 40px var(--accent-glow);
}

.project-body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-tag {
  align-self: flex-start;
  background: rgba(179, 157, 219, 0.15);
  color: var(--accent-primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

body.light-mode .project-tag {
  background: rgba(149, 117, 205, 0.15);
}

.project-card h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}

.project-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.project-tech span {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition-fast);
}

.project-links a:hover {
  color: var(--accent-primary);
}

/* Skills & Education Grid */
.skills-edu-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 4rem;
}

.skills-wrapper h3,
.edu-wrapper h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-category {
  margin-bottom: 2rem;
}

.skill-category h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-badge {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-fast);
  cursor: default;
}

.skill-badge:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.edu-timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.edu-card {
  padding: 1.5rem;
  border-radius: 12px;
  border-left: 3px solid var(--accent-primary);
}

.edu-card h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin-bottom: 0.25rem;
}

.edu-inst {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.edu-meta {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Contact / References */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info h3,
.ref-wrapper h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
}

.contact-list {
  list-style: none;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  font-size: 1.2rem;
}

.contact-text h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.contact-text p,
.contact-text a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1rem;
  transition: var(--transition-fast);
}

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

.ref-cards {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.ref-card {
  padding: 1.5rem;
  border-radius: 12px;
}

.ref-name {
  font-weight: 600;
  font-size: 1.1rem;
}

.ref-title {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.ref-contact {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Scroll Animation Classes */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.5, 0, 0, 1), transform 0.8s cubic-bezier(0.5, 0, 0, 1);
}

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

/* Responsive Styles */
@media (max-width: 968px) {

  .skills-edu-grid,
  .contact-section {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    /* simple mobile nav toggle could be added */
  }

  .timeline::before {
    left: 21px;
  }

  .timeline-item {
    padding-left: 3.5rem;
  }

  .timeline-dot {
    left: 10px;
  }
}