/* =============================================
   DESIGN TOKENS & CSS VARIABLES
   ============================================= */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap");

:root {
  /* Fonts */
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: "Space Grotesk", sans-serif;

  /* Font Sizes */
  --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 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --nav-height: 72px;
  --container-max: 1200px;
}

/* =============================================
   DARK THEME (Default)
   ============================================= */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.6);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #6366f1;
  --accent-secondary: #818cf8;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --accent-glow: rgba(99, 102, 241, 0.1);
  --border-color: rgba(148, 163, 184, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);
  --nav-bg: rgba(15, 23, 42, 0.85);
}

/* =============================================
   LIGHT THEME
   ============================================= */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-primary: #6366f1;
  --accent-secondary: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --accent-glow: rgba(99, 102, 241, 0.08);
  --border-color: rgba(15, 23, 42, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);
  --nav-bg: rgba(248, 250, 252, 0.85);
}

/* =============================================
   GLOBAL RESET & BASE
   ============================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-6); }

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

/* =============================================
   NAVBAR
   ============================================= */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--nav-bg); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-container {
  max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-6);
  display: flex; align-items: center; justify-content: space-between; height: var(--nav-height);
}

.nav-logo {
  font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700;
  color: var(--accent-primary); text-decoration: none;
}

.nav-links {
  display: flex; list-style: none; gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 500; color: var(--text-secondary);
  text-decoration: none; transition: all var(--transition-base);
}

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

.nav-controls { display: flex; align-items: center; gap: var(--space-2); }

.nav-btn {
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
  border: 1px solid var(--border-color); background: var(--bg-card);
  color: var(--text-secondary); font-size: var(--text-sm); font-weight: 500;
  cursor: pointer; transition: all var(--transition-base);
}

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

.lang-toggle.active { background: var(--accent-gradient); color: white; border-color: transparent; }

.burger-menu {
  display: none; flex-direction: column; gap: 5px; padding: var(--space-2);
  background: none; border: none; cursor: pointer;
}

.burger-line {
  width: 24px; height: 2px; background: var(--text-secondary);
  transition: all var(--transition-base); border-radius: 2px;
}

.burger-menu.open .burger-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.burger-menu.open .burger-line:nth-child(2) { opacity: 0; }
.burger-menu.open .burger-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
}

.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: var(--bg-primary);
}

.hero-gradient {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 50%, var(--accent-glow) 0%, transparent 70%);
}

#particles-canvas { position: absolute; inset: 0; z-index: 1; }

.hero-content {
  position: relative; z-index: 2; max-width: 700px; padding: 0 var(--space-6);
}

.hero-badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-full);
  background: var(--bg-card); border: 1px solid var(--border-color);
  font-size: var(--text-sm); color: var(--text-secondary);
  backdrop-filter: blur(10px); margin-bottom: var(--space-6);
}

.hero-badge .dot {
  width: 8px; height: 8px; border-radius: 50%; background: #22c55e;
  animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-greeting {
  font-size: var(--text-lg); color: var(--accent-primary); font-weight: 500;
  margin-bottom: var(--space-2);
}

.hero-name {
  font-family: var(--font-display); font-size: var(--text-6xl); font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1.1; margin-bottom: var(--space-4);
}

.hero-title {
  font-size: var(--text-2xl); font-weight: 600; color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: var(--text-base); color: var(--text-secondary);
  line-height: 1.8; margin-bottom: var(--space-8); max-width: 600px; margin-inline: auto;
}

.hero-cta {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-4) var(--space-8); border-radius: var(--radius-full);
  background: var(--accent-gradient); color: white; font-weight: 600;
  font-size: var(--text-base); text-decoration: none;
  transition: all var(--transition-base); box-shadow: var(--shadow-glow);
}

.hero-cta svg { width: 20px; height: 20px; }
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 0 40px rgba(99, 102, 241, 0.4); color: white; }

.hero-scroll-indicator {
  position: absolute; bottom: var(--space-8); left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-2);
  color: var(--text-muted); font-size: var(--text-sm); animation: float 3s ease infinite; z-index: 2;
}

.scroll-arrow { width: 20px; height: 20px; }

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

/* =============================================
   SECTIONS (GLOBAL)
   ============================================= */
.section { padding: var(--space-24) 0; }

.section-header { text-align: center; margin-bottom: var(--space-16); }

.section-title {
  font-family: var(--font-display); font-size: var(--text-4xl); font-weight: 700;
  color: var(--accent-primary); margin-bottom: var(--space-4);
}

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

/* =============================================
   SCROLL ANIMATIONS
   ============================================= */
.animate-on-scroll {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

.stagger-child {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.stagger-child.visible { opacity: 1; transform: translateY(0); }

/* =============================================
   ABOUT SECTION
   ============================================= */
.about-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: var(--space-16); align-items: center;
}

.about-text p { color: var(--text-secondary); margin-bottom: var(--space-6); line-height: 1.8; font-size: var(--text-base); }
.about-text strong { color: var(--text-primary); font-weight: 600; }

.about-info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); margin-top: var(--space-8); }

.about-info-card {
  padding: var(--space-5); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-xl); backdrop-filter: blur(10px);
}

.about-info-card .label {
  font-size: var(--text-xs); font-weight: 600; color: var(--accent-primary);
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: var(--space-1);
}

.about-info-card .value { font-size: var(--text-sm); color: var(--text-primary); font-weight: 500; }

.about-avatar-area { display: flex; justify-content: center; align-items: center; }

.avatar-container {
  position: relative; width: 280px; height: 280px;
}

.avatar-ring {
  position: absolute; inset: -6px; border-radius: 50%;
  border: 2px solid transparent;
  background: var(--accent-gradient) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  animation: ring-float 4s ease infinite;
  pointer-events: none;
}

@keyframes ring-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.avatar-image {
  width: 100%; height: 100%; border-radius: 50%; object-fit: cover;
  object-position: center top; border: 3px solid var(--bg-primary);
  background: var(--bg-card); position: relative;
}

/* =============================================
   EXPERIENCE SECTION
   ============================================= */
.experience-header {
  display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-10);
  padding: var(--space-6); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-2xl); backdrop-filter: blur(10px);
}

.experience-logo {
  width: 56px; height: 56px; border-radius: var(--radius-lg);
  background: var(--accent-gradient); display: flex; align-items: center;
  justify-content: center; font-family: var(--font-display); font-weight: 700;
  color: white; font-size: var(--text-lg); flex-shrink: 0;
}

.experience-company-info h3 { font-family: var(--font-display); font-size: var(--text-xl); color: var(--text-primary); }
.experience-company-info p { font-size: var(--text-sm); color: var(--text-muted); }

.timeline { position: relative; padding-left: var(--space-10); }

.timeline::before {
  content: ""; position: absolute; left: 11px; top: 0; bottom: 0;
  width: 2px; background: var(--border-color);
}

.timeline-item { position: relative; margin-bottom: var(--space-8); }

.timeline-dot {
  position: absolute; left: calc(-1 * var(--space-10) + 4px); top: var(--space-6);
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent-gradient); border: 3px solid var(--bg-primary);
}

.timeline-card {
  padding: var(--space-6); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-xl); backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.timeline-card:hover { border-color: var(--accent-primary); box-shadow: var(--shadow-md); }

.timeline-role { font-family: var(--font-display); font-size: var(--text-lg); color: var(--text-primary); margin-bottom: var(--space-2); }

.timeline-meta { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); color: var(--text-muted); margin-bottom: var(--space-4); flex-wrap: wrap; }

.timeline-duration { color: var(--accent-primary); font-weight: 500; }
.separator { color: var(--text-muted); }

.timeline-desc { color: var(--text-secondary); font-size: var(--text-sm); line-height: 1.7; margin-bottom: var(--space-4); }

.timeline-skills { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.skill-tag {
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  background: var(--accent-glow); color: var(--accent-primary);
  font-size: var(--text-xs); font-weight: 500;
}

/* =============================================
   EDUCATION SECTION
   ============================================= */
.education-grid { display: grid; gap: var(--space-4); }

.education-card {
  display: flex; align-items: flex-start; gap: var(--space-4);
  padding: var(--space-6); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-xl); backdrop-filter: blur(10px);
  transition: all var(--transition-base); position: relative;
}

.education-card:hover { border-color: var(--accent-primary); box-shadow: var(--shadow-md); }

.education-icon { font-size: var(--text-2xl); flex-shrink: 0; }
.education-info h3 { font-family: var(--font-display); font-size: var(--text-lg); color: var(--text-primary); margin-bottom: var(--space-1); }
.education-info .institution { color: var(--accent-primary); font-size: var(--text-sm); font-weight: 500; }
.education-info .period { color: var(--text-muted); font-size: var(--text-sm); }
.education-info .edu-desc { color: var(--text-secondary); font-size: var(--text-sm); margin-top: var(--space-2); }

.education-status {
  position: absolute; top: var(--space-4); right: var(--space-4);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 600;
}

.education-status.in-progress { background: rgba(99, 102, 241, 0.1); color: var(--accent-primary); }
.education-status.completed { background: rgba(34, 197, 94, 0.1); color: #22c55e; }

/* =============================================
   SKILLS SECTION
   ============================================= */
.skills-container { display: grid; gap: var(--space-10); }

.skills-category h3 {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-display); font-size: var(--text-xl); color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--space-3); }

.skill-card {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-4); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); transition: all var(--transition-base);
  font-size: var(--text-sm); color: var(--text-primary); font-weight: 500;
}

.skill-card:hover { border-color: var(--accent-primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.skill-icon-box {
  width: 36px; height: 36px; border-radius: var(--radius-md);
  background: var(--accent-glow); display: flex; align-items: center;
  justify-content: center; font-size: var(--text-lg); flex-shrink: 0;
}

/* =============================================
   PROJECTS SECTION
   ============================================= */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }

.project-card {
  padding: var(--space-8); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-2xl); backdrop-filter: blur(10px);
  transition: all var(--transition-base);
  border-top: 3px solid var(--accent-primary);
}

.project-card:hover { border-color: var(--accent-primary); box-shadow: var(--shadow-lg); transform: translateY(-4px); }

.project-type {
  display: inline-block; padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full); background: var(--accent-glow);
  color: var(--accent-primary); font-size: var(--text-xs); font-weight: 600;
  margin-bottom: var(--space-4);
}

.project-card h3 { font-family: var(--font-display); font-size: var(--text-xl); color: var(--text-primary); margin-bottom: var(--space-4); }

.project-desc { color: var(--text-secondary); font-size: var(--text-sm); line-height: 1.7; margin-bottom: var(--space-6); }

.project-highlights { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); margin-bottom: var(--space-6); }

.project-highlight {
  display: flex; align-items: flex-start; gap: var(--space-2);
  font-size: var(--text-sm); color: var(--text-primary);
}

.project-highlight .check { color: var(--accent-primary); font-weight: 700; }

.project-link {
  display: inline-flex; align-items: center; gap: var(--space-2);
  color: var(--accent-primary); font-weight: 600; font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.project-link:hover { gap: var(--space-3); }

/* =============================================
   CERTIFICATIONS SECTION
   ============================================= */
.certifications-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }

.cert-card {
  padding: var(--space-6); background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-xl); backdrop-filter: blur(10px);
  text-align: center; transition: all var(--transition-base);
}

.cert-card:hover { border-color: var(--accent-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }

.cert-icon {
  width: 48px; height: 48px; border-radius: var(--radius-lg);
  background: var(--accent-glow); display: flex; align-items: center;
  justify-content: center; font-size: var(--text-xl); margin: 0 auto var(--space-4);
}

.cert-card h3 { font-family: var(--font-display); font-size: var(--text-base); color: var(--text-primary); margin-bottom: var(--space-2); }
.cert-issuer { color: var(--accent-primary); font-size: var(--text-sm); font-weight: 500; }
.cert-date { color: var(--text-muted); font-size: var(--text-xs); margin-top: var(--space-1); }

/* =============================================
   CONTACT SECTION
   ============================================= */
.contact-content { text-align: center; max-width: 600px; margin: 0 auto; }

.contact-subtitle {
  color: var(--text-secondary); font-size: var(--text-base); line-height: 1.8;
  margin-bottom: var(--space-10);
}

.social-icons { display: flex; justify-content: center; gap: var(--space-6); flex-wrap: wrap; }

.social-icon-link {
  display: flex; align-items: center; justify-content: center;
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--border-color);
  color: var(--text-secondary); transition: all var(--transition-base);
  backdrop-filter: blur(10px); text-decoration: none;
}

.social-icon-link svg { width: 28px; height: 28px; }

.social-icon-link:hover {
  color: white; border-color: var(--accent-primary);
  background: var(--accent-gradient); transform: translateY(-4px) scale(1.1);
  box-shadow: var(--shadow-glow);
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
  padding: var(--space-8) 0; text-align: center;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted); font-size: var(--text-sm);
}

.footer .heart { color: #ef4444; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .burger-menu { display: flex; }

  .nav-links {
    position: fixed; top: var(--nav-height); left: 0; right: 0;
    background: var(--nav-bg); backdrop-filter: blur(20px);
    flex-direction: column; padding: var(--space-4);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%); opacity: 0;
    transition: all var(--transition-base); pointer-events: none;
  }

  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: all; }

  .hero-name { font-size: var(--text-4xl); }
  .hero-title { font-size: var(--text-xl); }
  .about-grid { grid-template-columns: 1fr; }
  .about-avatar-area { order: -1; }
  .avatar-container { width: 200px; height: 200px; }
  .about-info-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .certifications-grid { grid-template-columns: 1fr; }
  .project-highlights { grid-template-columns: 1fr; }
  .section-title { font-size: var(--text-3xl); }
}

@media (max-width: 480px) {
  .hero-name { font-size: var(--text-3xl); }
  .skills-grid { grid-template-columns: 1fr; }
}