/* ─────────────────────────────────────────
   CSS Custom Properties (Dark theme default)
───────────────────────────────────────── */
:root {
  --bg:          #0a0f1e;
  --bg2:         #111827;
  --bg3:         #1a2235;
  --card:        #141c2e;
  --border:      #1e2d45;
  --accent:      #38bdf8;
  --accent2:     #818cf8;
  --text:        #e2e8f0;
  --text-muted:  #8896aa;
  --text-dim:    #64748b;
  --nav-bg:      rgba(10, 15, 30, 0.85);
  --shadow:      rgba(0,0,0,0.5);
  --tag-bg:      rgba(56, 189, 248, 0.1);
  --tag-color:   #38bdf8;
  --stat-bg:     #111827;
  --gpa-bg:      rgba(56, 189, 248, 0.12);
  --gpa-color:   #38bdf8;
}

body.light {
  --bg:          #f0f4f8;
  --bg2:         #e8eef5;
  --bg3:         #dde6f0;
  --card:        #ffffff;
  --border:      #d0dbe8;
  --accent:      #0284c7;
  --accent2:     #6366f1;
  --text:        #0f172a;
  --text-muted:  #475569;
  --text-dim:    #94a3b8;
  --nav-bg:      rgba(240, 244, 248, 0.9);
  --shadow:      rgba(0,0,0,0.08);
  --tag-bg:      rgba(2, 132, 199, 0.1);
  --tag-color:   #0284c7;
  --stat-bg:     #ffffff;
  --gpa-bg:      rgba(2, 132, 199, 0.1);
  --gpa-color:   #0284c7;
}

/* ─────────────────────────────────────────
   Reset & Base
───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ─────────────────────────────────────────
   Layout helpers
───────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 6rem 0;
}

section:nth-child(even) {
  background: var(--bg2);
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0; bottom: -8px;
  width: 50px; height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* ─────────────────────────────────────────
   Scroll Reveal Animation
───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ─────────────────────────────────────────
   Navbar
───────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

#navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 4px 30px var(--shadow);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  margin-left: auto;
}

.nav-links li a {
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--accent);
  background: var(--tag-bg);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.icon-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px; height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--tag-bg);
}

/* Hamburger */
.hamburger { flex-direction: column; gap: 4px; display: none; }
.hamburger span {
  display: block;
  width: 16px; height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: 0.3s;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px; right: 0;
    flex-direction: column;
    background: var(--bg2);
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: 0.5rem;
    width: 220px;
    transform: translateX(100%);
    transition: transform 0.3s;
    margin-left: 0;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links li a { display: block; padding: 0.6rem 1rem; }
  .hamburger { display: flex; }
}

/* ─────────────────────────────────────────
   Hero
───────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 6rem 1.5rem 1.5rem;
  background: var(--bg);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(56, 189, 248, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(129, 140, 248, 0.07) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.25rem;
}

.hero-role {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(1rem, 3vw, 1.35rem);
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  height: 2em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.caret {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.hero-location {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #0a0f1e;
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.3);
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--tag-bg);
  transform: translateY(-2px);
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-dim);
  font-size: 0.95rem;
  animation: bob 2s ease-in-out infinite;
}

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

/* ─────────────────────────────────────────
   About
───────────────────────────────────────── */
#about { padding-top: 3rem; }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1.1rem;
  font-size: 1rem;
}

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

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.stat-card {
  background: var(--stat-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 1.25rem;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.1;
  font-family: 'JetBrains Mono', monospace;
}

.stat-lbl {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ─────────────────────────────────────────
   Experience Timeline
───────────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px; top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
}

.tl-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.tl-item:last-child { margin-bottom: 0; }

.tl-dot {
  position: absolute;
  left: -1.75rem;
  top: 0.5rem;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
  z-index: 1;
}

.tl-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.75rem;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.tl-card:hover {
  border-color: var(--accent);
  transform: translateX(4px);
  box-shadow: 0 8px 32px var(--shadow);
}

.tl-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.tl-role {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.tl-company {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tl-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-dim);
  white-space: nowrap;
  background: var(--bg2);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.tl-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.tl-bullets li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 1.25rem;
  position: relative;
}

.tl-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
  top: 0.1em;
}

.tl-bullets strong { color: var(--text); }

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

@media (max-width: 768px) { .edu-grid { grid-template-columns: 1fr; } }

.edu-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: border-color 0.2s, transform 0.2s;
}

.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.edu-icon-wrap {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--tag-bg);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.edu-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.edu-degree {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.edu-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.badge.gpa {
  background: var(--gpa-bg);
  color: var(--gpa-color);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
}

.edu-dates {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
}

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

/* ─────────────────────────────────────────
   Projects
───────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 640px) { .projects-grid { grid-template-columns: 1fr; } }

.proj-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.proj-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--shadow);
}

.proj-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.proj-icon {
  font-size: 1.75rem;
  color: var(--accent);
}

.proj-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
  background: var(--bg2);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.proj-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.proj-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  flex: 1;
}

.proj-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.proj-tags span {
  background: var(--tag-bg);
  color: var(--tag-color);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  font-family: 'JetBrains Mono', monospace;
}

/* ─────────────────────────────────────────
   Skills
───────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 768px) { .skills-grid { grid-template-columns: 1fr; } }

.skill-group {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  transition: border-color 0.2s;
}

.skill-group:hover { border-color: var(--accent); }

.skill-group h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

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

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tags span {
  background: var(--tag-bg);
  color: var(--tag-color);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 8px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  font-family: 'JetBrains Mono', monospace;
  transition: background 0.2s, transform 0.2s;
}

.skill-tags span:hover {
  background: rgba(56, 189, 248, 0.2);
  transform: translateY(-2px);
}

/* ─────────────────────────────────────────
   Certifications
───────────────────────────────────────── */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.cert-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: border-color 0.2s, transform 0.2s;
}

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

.cert-icon {
  font-size: 1.5rem;
  color: var(--accent2);
  flex-shrink: 0;
}

.cert-body { flex: 1; }

.cert-body h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
  line-height: 1.4;
}

.cert-body p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.cert-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-dim);
  white-space: nowrap;
  background: var(--bg2);
  padding: 0.2rem 0.5rem;
  border-radius: 5px;
  border: 1px solid var(--border);
}

/* ─────────────────────────────────────────
   Contact
───────────────────────────────────────── */
.contact-container {
  text-align: center;
  max-width: 650px;
}

.contact-sub {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: all 0.2s;
}

.contact-item i { color: var(--accent); font-size: 1rem; }

.contact-item:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow);
}

/* ─────────────────────────────────────────
   Footer
───────────────────────────────────────── */
footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.875rem;
}

footer strong { color: var(--text-muted); }

.footer-sub {
  margin-top: 0.75rem;
  display: flex;
  justify-content: center;
  gap: 1.25rem;
}

.footer-sub a {
  color: var(--text-dim);
  font-size: 1.1rem;
  transition: color 0.2s;
}

.footer-sub a:hover { color: var(--accent); }

/* ─────────────────────────────────────────
   Responsive tweaks
───────────────────────────────────────── */
@media (max-width: 480px) {
  section { padding: 4rem 0; }
  .hero-ctas { flex-direction: column; align-items: center; }
  .tl-header { flex-direction: column; }
}