/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --bg: #0a192f;
  --bg-secondary: #112240;
  --bg-card: #1d3461;
  --accent: #64ffda;
  --accent-dim: rgba(100, 255, 218, 0.08);
  --accent-hover: rgba(100, 255, 218, 0.15);
  --text: #ccd6f6;
  --text-secondary: #8892b0;
  --white: #e6f1ff;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  --nav-height: 70px;
  --max-width: 1100px;

  --shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
  --shadow-sm: 0 4px 6px rgba(2, 12, 27, 0.4);
  --transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
  --radius: 4px;
  --radius-lg: 8px;
}

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

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ============================================
   Navigation
   ============================================ */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition);
  padding: 0 50px;
}

#navbar.scrolled {
  background-color: rgba(10, 25, 47, 0.97);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
}

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

.nav-link {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

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

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

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

.btn-resume {
  border: 1px solid var(--accent) !important;
  color: var(--accent) !important;
  padding: 8px 18px;
  border-radius: var(--radius);
}

.btn-resume:hover {
  background: var(--accent-dim);
}

.btn-resume::after { display: none !important; }

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

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  transform-origin: left center;
}

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

/* ============================================
   Hero Section
   ============================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 50px;
  padding-top: var(--nav-height);
}

.hero-content {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
}

.hero-avatar {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 6px var(--accent-dim);
  margin-bottom: 2rem;
}

.hero-greeting {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.hero-title {
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.hero-desc {
  max-width: 580px;
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  line-height: 1.75;
}

.hero-socials {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.social-icon {
  color: var(--text-secondary);
  font-size: 1.4rem;
  transition: var(--transition);
}

.social-icon:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg) !important;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  display: inline-block;
}

.btn-primary:hover {
  background: rgba(100, 255, 218, 0.85);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(100, 255, 218, 0.25);
}

.btn-outline {
  border: 1px solid var(--accent);
  color: var(--accent) !important;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  display: inline-block;
}

.btn-outline:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
}

/* ============================================
   Shared Section Styles
   ============================================ */
.section {
  padding: 100px 50px;
}

.section-alt {
  background-color: var(--bg-secondary);
}

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

.section-heading {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  white-space: nowrap;
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(100, 255, 218, 0.12);
  max-width: 320px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 400;
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.75;
}

.about-text strong { color: var(--accent); }

.soft-skills { margin-top: 1.5rem; }
.soft-skills h3 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
}

.soft-skills ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.soft-skills ul li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.soft-skills ul li i {
  color: var(--accent);
  font-size: 0.65rem;
}

.about-img-wrap {
  display: flex;
  justify-content: center;
}

.img-frame {
  position: relative;
  width: 240px;
  height: 240px;
}

.img-frame::before {
  content: '';
  position: absolute;
  top: 14px;
  left: 14px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.img-frame:hover::before { top: 8px; left: 8px; }

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  filter: grayscale(15%);
  position: relative;
  z-index: 1;
  transition: var(--transition);
}

.img-frame:hover img { filter: grayscale(0%); }

/* ============================================
   Experience / Timeline
   ============================================ */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent) 0%, transparent 100%);
}

.tl-item {
  position: relative;
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.tl-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.tl-dot {
  position: absolute;
  left: -35px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.tl-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  border: 1px solid rgba(100, 255, 218, 0.07);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.tl-card:hover {
  border-color: rgba(100, 255, 218, 0.22);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.job-role {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.2rem;
}

.job-company {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
  display: block;
  margin-bottom: 0.3rem;
}

.job-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.job-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.job-company-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-style: italic;
  margin-bottom: 0.85rem;
  line-height: 1.6;
}

.job-contributions {
  margin-bottom: 1rem;
}

.job-contributions li {
  display: flex;
  gap: 0.65rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.45rem;
  line-height: 1.65;
}

.job-contributions li::before {
  content: '▸';
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.job-contributions li strong { color: var(--white); }

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-stack span {
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 3px;
  border: 1px solid rgba(100, 255, 218, 0.12);
}

/* ============================================
   Skills Section
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.skill-card {
  background: var(--bg-secondary);
  border: 1px solid rgba(100, 255, 218, 0.07);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.skill-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.skill-card:hover {
  border-color: rgba(100, 255, 218, 0.28);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.skill-card h3 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-card h3 i { color: var(--accent); }

.skill-card ul li {
  color: var(--text-secondary);
  font-size: 0.875rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  transition: var(--transition);
}

.skill-card ul li:last-child { border-bottom: none; }

.skill-card ul li:hover {
  color: var(--accent);
  padding-left: 0.4rem;
}

/* ============================================
   Education Section
   ============================================ */
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.edu-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  border: 1px solid rgba(100, 255, 218, 0.07);
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.edu-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.edu-card:hover {
  border-color: rgba(100, 255, 218, 0.25);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.edu-icon {
  font-size: 1.75rem;
  color: var(--accent);
  flex-shrink: 0;
  padding-top: 2px;
}

.edu-degree {
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.edu-school {
  color: var(--accent);
  font-size: 0.875rem;
  margin-bottom: 0.2rem;
}

.edu-period {
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
}

.edu-note {
  color: var(--text-secondary);
  font-size: 0.84rem;
  line-height: 1.5;
}

.edu-note strong { color: var(--white); }

/* ============================================
   Footer / Contact
   ============================================ */
footer {
  padding: 80px 50px;
  text-align: center;
  background: var(--bg);
}

.footer-tagline {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.footer-title {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  color: var(--white);
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-desc {
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 2.5rem;
  font-size: 1rem;
  line-height: 1.7;
}

.contact-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition);
  border: 1px solid rgba(100, 255, 218, 0.12);
  padding: 10px 18px;
  border-radius: var(--radius);
}

.contact-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
  background: var(--accent-dim);
}

.footer-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.05);
  margin-bottom: 1.5rem;
}

.footer-bottom {
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  line-height: 1.8;
}

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

@media (max-width: 768px) {
  #navbar { padding: 0 24px; }

  .menu-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    height: 100vh;
    width: 70%; max-width: 280px;
    background: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    transition: right 0.3s ease;
    box-shadow: var(--shadow);
    z-index: 1000;
  }

  .nav-links.open { right: 0; }
  .nav-link { font-size: 1rem; }

  #hero, .section, footer {
    padding-left: 24px;
    padding-right: 24px;
  }

  .section { padding-top: 70px; padding-bottom: 70px; }
  footer { padding-top: 60px; padding-bottom: 60px; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-img-wrap { order: -1; }

  .img-frame { width: 180px; height: 180px; }

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

  .tl-card { padding: 1.25rem; }
}

@media (max-width: 540px) {
  .skills-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .soft-skills ul { grid-template-columns: 1fr; }
  .edu-card { flex-direction: column; }
  .contact-list { flex-direction: column; align-items: center; }
}