@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ============ DESIGN TOKENS ============ */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #14141f;
  --border-color: #1e1e30;
  --accent-1: #6c63ff;
  --accent-2: #00d4ff;
  --accent-gradient: linear-gradient(135deg, #6c63ff 0%, #00d4ff 100%);
  --text-primary: #e8e8ec;
  --text-secondary: #8888a0;
  --text-muted: #55556a;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;
  --shadow-glow: 0 0 30px rgba(108, 99, 255, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 16px;
}

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

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }

/* ============ UTILITY ============ */
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; position: relative; }
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent-2);
  margin-bottom: 12px;
}
.section-label::before {
  content: ''; width: 24px; height: 2px;
  background: var(--accent-gradient); border-radius: 2px;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800; letter-spacing: -0.5px;
  margin-bottom: 16px; line-height: 1.2;
}
.section-subtitle {
  font-size: 1.05rem; color: var(--text-secondary);
  max-width: 560px; line-height: 1.7;
}
.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Scroll reveal */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============ NAVBAR ============ */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  height: var(--nav-height);
  display: flex; align-items: center;
  background: rgba(10, 10, 15, 0.6);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.navbar.scrolled { border-bottom-color: var(--border-color); background: rgba(10, 10, 15, 0.92); }
.nav-inner {
  max-width: 1140px; margin: 0 auto; padding: 0 24px;
  width: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.5px; }
.nav-logo span { color: var(--accent-1); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 0.88rem; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition); position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--accent-gradient);
  transition: width 0.3s ease; border-radius: 2px;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.btn-cv {
  padding: 10px 22px; border-radius: var(--radius-sm);
  background: var(--accent-gradient); color: #fff !important;
  font-size: 0.85rem; font-weight: 700;
  transition: var(--transition); box-shadow: 0 2px 16px rgba(108, 99, 255, 0.35);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}
.btn-cv:hover { transform: translateY(-2px); box-shadow: 0 4px 24px rgba(108, 99, 255, 0.5); color: #fff !important; }
.btn-cv::after { display: none !important; }

/* Hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; z-index: 1001; }
.hamburger span {
  width: 24px; height: 2px; background: var(--text-primary);
  transition: var(--transition); border-radius: 2px;
}
.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; align-items: center;
  position: relative; overflow: hidden;
  padding-top: var(--nav-height);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(108, 99, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 99, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 50% 50%, black 30%, transparent 70%);
}
.hero-glow {
  position: absolute; width: 600px; height: 600px;
  border-radius: 50%; filter: blur(120px); opacity: 0.12;
}
.hero-glow-1 { top: -100px; right: -100px; background: var(--accent-1); }
.hero-glow-2 { bottom: -200px; left: -100px; background: var(--accent-2); }

.hero-content {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 60px;
  max-width: 1140px; margin: 0 auto; padding: 0 24px; width: 100%;
}
.hero-text { flex: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: var(--radius-lg);
  background: rgba(108, 99, 255, 0.1); border: 1px solid rgba(108, 99, 255, 0.2);
  font-size: 0.8rem; font-weight: 500; color: var(--accent-2);
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #4ade80; animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.4); }
  50% { box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
}
.hero-name {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 900; line-height: 1.1;
  letter-spacing: -1.5px; margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--text-secondary); font-weight: 400;
  margin-bottom: 28px; max-width: 520px; line-height: 1.6;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  padding: 14px 32px; border-radius: var(--radius-sm);
  background: var(--accent-gradient); color: #fff;
  font-size: 0.95rem; font-weight: 600;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(108, 99, 255, 0.45); }
.btn-secondary {
  padding: 14px 32px; border-radius: var(--radius-sm);
  background: transparent; color: var(--text-primary);
  font-size: 0.95rem; font-weight: 600;
  border: 1px solid var(--border-color);
  transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
}
.btn-secondary:hover { border-color: var(--accent-1); background: rgba(108, 99, 255, 0.06); }

.hero-image {
  flex-shrink: 0; position: relative;
}
.hero-image-wrapper {
  width: 300px; height: 300px; border-radius: 50%;
  overflow: hidden; position: relative;
  border: 3px solid transparent;
  background-image: var(--accent-gradient);
  background-origin: border-box;
  background-clip: padding-box, border-box;
  box-shadow: 0 0 60px rgba(108, 99, 255, 0.2);
}
.hero-image-wrapper img {
  width: 100%; height: 100%; object-fit: cover;
}
.hero-image-ring {
  position: absolute; inset: -12px;
  border: 1px solid rgba(108, 99, 255, 0.15);
  border-radius: 50%; animation: spin-slow 20s linear infinite;
}
.hero-image-ring::before {
  content: ''; position: absolute; top: -4px; left: 50%;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-2);
}
@keyframes spin-slow { to { transform: rotate(360deg); } }

/* ============ ABOUT ============ */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  align-items: start; margin-top: 48px;
}
.about-text p {
  color: var(--text-secondary); margin-bottom: 20px; font-size: 1rem;
}
.about-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-top: 32px;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 20px; text-align: center;
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--accent-1); transform: translateY(-3px); box-shadow: var(--shadow-glow); }
.stat-number { font-size: 1.8rem; font-weight: 800; }
.stat-label { font-size: 0.78rem; color: var(--text-secondary); margin-top: 4px; text-transform: uppercase; letter-spacing: 1px; }

.about-details { display: flex; flex-direction: column; gap: 20px; }
.detail-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 24px;
  transition: var(--transition);
}
.detail-card:hover { border-color: var(--accent-1); }
.detail-card-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 12px;
}
.detail-icon {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: rgba(108, 99, 255, 0.1); display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.detail-card h4 { font-size: 0.95rem; font-weight: 700; }
.detail-card p, .detail-card li { font-size: 0.88rem; color: var(--text-secondary); }
.detail-card ul { margin-top: 8px; }
.detail-card ul li { padding: 4px 0; display: flex; align-items: center; gap: 8px; }
.detail-card ul li::before { content: '▹'; color: var(--accent-1); font-size: 0.7rem; }
.cert-badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px;
  background: rgba(108, 99, 255, 0.08); border: 1px solid rgba(108, 99, 255, 0.15);
  border-radius: var(--radius-lg); font-size: 0.8rem; color: var(--accent-2);
  margin: 4px 4px 0 0; transition: var(--transition); cursor: pointer;
}
a.cert-badge:hover {
  background: rgba(108, 99, 255, 0.18); border-color: var(--accent-1);
  transform: translateY(-1px);
}

/* ============ SKILLS ============ */
.skills-tabs {
  display: flex; flex-wrap: wrap; gap: 8px; margin: 40px 0 32px;
}
.skill-tab {
  padding: 8px 20px; border-radius: var(--radius-lg);
  font-size: 0.85rem; font-weight: 500; color: var(--text-secondary);
  border: 1px solid var(--border-color); background: transparent;
  transition: var(--transition); cursor: pointer;
}
.skill-tab:hover, .skill-tab.active {
  color: #fff; background: var(--accent-1); border-color: var(--accent-1);
}
.skills-grid {
  display: flex; flex-wrap: wrap; gap: 10px;
}
.skill-pill {
  padding: 10px 20px; border-radius: var(--radius-lg);
  background: var(--bg-card); border: 1px solid var(--border-color);
  font-size: 0.88rem; font-weight: 500; color: var(--text-primary);
  transition: var(--transition); cursor: default;
  display: inline-flex; align-items: center; gap: 8px;
}
.skill-pill:hover {
  border-color: var(--accent-1); transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(108, 99, 255, 0.15);
}
.skill-pill .skill-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent-2);
}
.skill-pill[data-category] { display: none; }
.skill-pill.show { display: inline-flex; }

/* ============ EXPERIENCE TIMELINE ============ */
.timeline { position: relative; margin-top: 48px; padding-left: 40px; }
.timeline::before {
  content: ''; position: absolute; left: 15px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(to bottom, var(--accent-1), var(--accent-2), transparent);
}
.timeline-item { position: relative; margin-bottom: 48px; }
.timeline-dot {
  position: absolute; left: -33px; top: 24px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent-1); border: 3px solid var(--bg-primary);
  z-index: 1;
}
.timeline-item.current .timeline-dot {
  background: #4ade80;
  box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.2);
  animation: pulse-dot 2s infinite;
}
.timeline-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 28px;
  transition: var(--transition);
}
.timeline-card:hover { border-color: var(--accent-1); box-shadow: var(--shadow-glow); }
.timeline-header { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.timeline-company { font-size: 1.15rem; font-weight: 700; }
.timeline-role { font-size: 0.95rem; color: var(--accent-2); font-weight: 500; margin-top: 2px; }
.timeline-date {
  font-size: 0.8rem; color: var(--text-muted); font-weight: 500;
  padding: 4px 12px; border-radius: var(--radius-lg);
  background: rgba(108, 99, 255, 0.08); border: 1px solid rgba(108, 99, 255, 0.12);
  white-space: nowrap;
}
.current-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.75rem; font-weight: 600; color: #4ade80;
  padding: 3px 10px; border-radius: var(--radius-lg);
  background: rgba(74, 222, 128, 0.08); border: 1px solid rgba(74, 222, 128, 0.2);
  margin-left: 8px;
}
.timeline-bullets { margin-top: 12px; }
.timeline-bullets li {
  padding: 6px 0; font-size: 0.9rem; color: var(--text-secondary);
  display: flex; align-items: flex-start; gap: 10px;
}
.timeline-bullets li::before { content: '▹'; color: var(--accent-1); margin-top: 2px; flex-shrink: 0; }

/* ============ PROJECTS ============ */
.projects-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
  margin-top: 48px;
}
.project-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 32px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.project-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--accent-gradient);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.4s ease;
}
.project-card:hover::before { transform: scaleX(1); }
.project-card:hover { border-color: var(--accent-1); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.project-number {
  font-size: 0.75rem; font-weight: 700; color: var(--accent-1);
  letter-spacing: 2px; margin-bottom: 12px;
}
.project-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 20px; }
.project-par { margin-bottom: 16px; }
.project-par-label {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1.5px; margin-bottom: 6px;
}
.project-par-label.problem { color: #f87171; }
.project-par-label.action { color: #fbbf24; }
.project-par-label.result { color: #4ade80; }
.project-par p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }
.project-tech {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 20px;
  padding-top: 16px; border-top: 1px solid var(--border-color);
}
.project-tech span {
  padding: 4px 12px; border-radius: var(--radius-lg);
  font-size: 0.75rem; font-weight: 500; color: var(--accent-2);
  background: rgba(0, 212, 255, 0.06); border: 1px solid rgba(0, 212, 255, 0.12);
}

/* ============ CONTACT ============ */
.contact-wrapper {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
  margin-top: 48px;
}
.contact-info h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 16px; }
.contact-info > p { color: var(--text-secondary); margin-bottom: 32px; font-size: 0.95rem; }
.contact-links { display: flex; flex-direction: column; gap: 16px; }
.contact-link {
  display: flex; align-items: center; gap: 16px;
  padding: 16px 20px; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-md);
  transition: var(--transition); font-size: 0.92rem;
}
.contact-link:hover { border-color: var(--accent-1); transform: translateX(4px); }
.contact-link-icon {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: rgba(108, 99, 255, 0.1); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}
.contact-link span { color: var(--text-secondary); }

.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.82rem; font-weight: 600; color: var(--text-secondary); }
.form-group input, .form-group textarea {
  padding: 14px 16px; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  color: var(--text-primary); font-family: var(--font); font-size: 0.92rem;
  transition: var(--transition); outline: none;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent-1); box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.btn-submit {
  padding: 14px 32px; border-radius: var(--radius-sm);
  background: var(--accent-gradient); color: #fff;
  font-size: 0.95rem; font-weight: 600;
  transition: var(--transition); align-self: flex-start;
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.3);
}
.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(108, 99, 255, 0.45); }

/* ============ FOOTER ============ */
.footer {
  padding: 40px 0; border-top: 1px solid var(--border-color);
  text-align: center;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer p { font-size: 0.85rem; color: var(--text-muted); }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; transition: var(--transition);
}
.footer-socials a:hover { border-color: var(--accent-1); background: rgba(108, 99, 255, 0.1); }

/* ============ RESPONSIVE ============ */
@media (max-width: 968px) {
  .hero-content { flex-direction: column-reverse; text-align: center; gap: 40px; }
  .hero-cta { justify-content: center; }
  .hero-image-wrapper { width: 220px; height: 220px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .projects-grid { grid-template-columns: 1fr; }
  .contact-wrapper { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
    flex-direction: column; justify-content: center;
    background: var(--bg-secondary); border-left: 1px solid var(--border-color);
    padding: 40px; gap: 24px; transition: right 0.3s ease;
  }
  .nav-links.open { right: 0; }
  .hamburger { display: flex; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .timeline { padding-left: 32px; }
  .timeline::before { left: 11px; }
  .timeline-dot { left: -28px; }
  .hero-name { font-size: 2.2rem; }
  .hero-image-wrapper { width: 180px; height: 180px; }
  .timeline-header { flex-direction: column; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .about-stats { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: center; }
  .hero-cta .btn-primary, .hero-cta .btn-secondary { width: 100%; justify-content: center; }
  .footer-inner { flex-direction: column; }
}