/* ===== Reset & Variables ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0e14;
  --bg-soft: #10151f;
  --surface: #131826;
  --surface-2: #171d2d;
  --border: #232a3b;
  --text: #e8ecf4;
  --text-dim: #9aa5b8;
  --text-faint: #626d82;
  --accent: #5eead4;
  --accent-2: #7c9bff;
  --accent-soft: rgba(94, 234, 212, 0.12);
  --danger: #ff8080;
  --radius: 14px;
  --shadow: 0 20px 60px rgba(0,0,0,0.35);
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-head: 'Space Grotesk', 'Inter', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ===== Background decor ===== */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

.bg-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 700px;
  z-index: -1;
  background: radial-gradient(circle, rgba(94,234,212,0.14) 0%, rgba(124,155,255,0.08) 40%, transparent 70%);
  filter: blur(10px);
  pointer-events: none;
}

/* ===== Navbar ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 20, 0.7);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.navbar.scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 14, 20, 0.92);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}
.logo .dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 28px;
  margin-left: auto;
}
.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-dim);
  position: relative;
  padding: 6px 0;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width .25s ease;
}
.nav-links a:hover::after { width: 100%; }

.nav-cta { flex-shrink: 0; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: #06110f;
  box-shadow: 0 8px 24px rgba(94,234,212,0.25);
}
.btn-primary:hover { box-shadow: 0 10px 30px rgba(94,234,212,0.4); transform: translateY(-2px); }

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.btn-small { padding: 9px 18px; font-size: 0.85rem; }

/* ===== Hero ===== */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 40px;
  min-height: calc(100vh - 72px);
  padding-top: 40px;
  padding-bottom: 60px;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(94,234,212,0.25);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2.1rem, 4.2vw, 3.3rem);
  line-height: 1.15;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.highlight {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--text-dim);
  font-size: 1.08rem;
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-bottom: 34px;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-bottom: 18px;
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: color .2s ease;
}
.meta-item:hover { color: var(--accent); }
.meta-icon { color: var(--accent); }

.hero-social {
  display: flex;
  gap: 20px;
}
.hero-social a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}
.hero-social a:hover { color: var(--accent); border-color: var(--accent); }

/* Hero visual - code window */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.orbit-card { position: relative; width: 100%; max-width: 420px; }

.code-window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transform: perspective(1000px) rotateY(-6deg) rotateX(2deg);
  transition: transform .4s ease;
}
.orbit-card:hover .code-window { transform: perspective(1000px) rotateY(0deg) rotateX(0deg); }

.code-window-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.code-window-head span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--border);
}
.code-window-head span:nth-child(1) { background: #ff5f57; }
.code-window-head span:nth-child(2) { background: #febc2e; }
.code-window-head span:nth-child(3) { background: #28c840; }
.code-window-head p {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

.code-body {
  padding: 22px 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-dim);
  overflow-x: auto;
}
.c-kw { color: var(--accent-2); }
.c-cl { color: var(--accent); }
.c-fn { color: #f0c987; }

.float-chip {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  box-shadow: 0 10px 24px rgba(0,0,0,0.3);
  animation: floaty 5s ease-in-out infinite;
}
.chip-1 { top: -18px; right: -10px; color: var(--accent); animation-delay: 0s; }
.chip-2 { bottom: 40px; left: -30px; color: var(--accent-2); animation-delay: 1.2s; }
.chip-3 { bottom: -16px; right: 30px; color: #f0c987; animation-delay: 2.4s; }

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

/* ===== Sections ===== */
.section { padding: 110px 24px; }

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 46px;
  letter-spacing: -0.01em;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 50px;
  align-items: start;
}
.about-text {
  color: var(--text-dim);
  font-size: 1.08rem;
  line-height: 1.85;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
}
.stat-num {
  display: block;
  font-family: var(--font-head);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-faint);
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform .25s ease, border-color .25s ease;
}
.skill-card:hover {
  transform: translateY(-4px);
  border-color: rgba(94,234,212,0.3);
}
.skill-card h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  margin-bottom: 14px;
  color: var(--text);
}

.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list-tight { margin-bottom: 18px; }
.tag {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 999px;
}
.tag-sm { font-size: 0.74rem; padding: 5px 11px; color: var(--accent); border-color: rgba(94,234,212,0.2); }

/* ===== Experience Timeline ===== */
.timeline {
  position: relative;
  padding-left: 34px;
  border-left: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 46px;
}

.timeline-item { position: relative; }

.timeline-dot {
  position: absolute;
  left: -42px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(94,234,212,0.12);
}

.timeline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
}

.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.timeline-head h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  margin-bottom: 4px;
}
.timeline-org { color: var(--accent); font-size: 0.92rem; font-weight: 500; }
.timeline-project { color: var(--text-faint); font-size: 0.85rem; margin-top: 2px; font-style: italic; }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.timeline-list { display: flex; flex-direction: column; gap: 10px; }
.timeline-list li {
  position: relative;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.65;
}
.timeline-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
}

/* ===== Education ===== */
.edu-card {
  display: flex;
  align-items: center;
  gap: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
}
.edu-icon {
  font-size: 2rem;
  background: var(--accent-soft);
  border-radius: 14px;
  width: 64px; height: 64px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.edu-card h3 { font-family: var(--font-head); font-size: 1.1rem; margin-bottom: 6px; }
.edu-org { color: var(--text-dim); font-size: 0.94rem; margin-bottom: 8px; }
.edu-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

/* ===== Certifications ===== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.cert-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform .25s ease, border-color .25s ease;
}
.cert-card:hover { transform: translateY(-4px); border-color: rgba(94,234,212,0.3); }
.cert-icon {
  font-size: 1.6rem;
  margin-bottom: 14px;
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft);
  border-radius: 12px;
}
.cert-card h3 { font-family: var(--font-head); font-size: 1rem; margin-bottom: 8px; }
.cert-id { font-family: var(--font-mono); font-size: 0.76rem; color: var(--text-faint); word-break: break-all; }

/* ===== Contact ===== */
.contact-sub {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 560px;
  margin-top: -30px;
  margin-bottom: 44px;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}
.contact-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  background: var(--surface-2);
}
.contact-icon {
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 4px;
}
.contact-label { font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.contact-value { font-size: 0.95rem; font-weight: 600; word-break: break-word; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-faint);
}

/* ===== Back to top ===== */
.to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .3s ease;
  z-index: 90;
  box-shadow: var(--shadow);
}
.to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { border-color: var(--accent); transform: translateY(-3px); }

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 20px; }
  .hero-visual { order: -1; margin-bottom: 10px; }
  .orbit-card { max-width: 340px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 760px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }

  .nav-links.mobile-open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0; right: 0;
    background: rgba(10,14,20,0.98);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 18px 24px;
    gap: 16px;
  }
  .nav-cta.mobile-open { display: inline-flex; margin: 0 24px 18px; }

  .section { padding: 80px 20px; }
  .timeline { padding-left: 26px; }
  .timeline-dot { left: -34px; }
  .timeline-head { flex-direction: column; }
  .edu-card { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
}