/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  --bg:        #0a0e1a;
  --surface:   #111827;
  --surface2:  #1a2235;
  --border:    #1e2d45;
  --accent:    #38bdf8;
  --accent2:   #818cf8;
  --text:      #e2e8f0;
  --muted:     #64748b;
  --success:   #34d399;
  --font-head: 'DM Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius:    6px;
  --transition: 0.25s ease;
  --max-width: 1100px;
}

/* ============================================================
   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: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 600; line-height: 1.3; }

a { color: var(--accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }

ul { list-style: none; }

img { max-width: 100%; display: block; }

/* ============================================================
   NAVIGATION
   ============================================================ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.accent-dot { color: var(--accent); }

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

.nav-links a {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover { color: var(--text); opacity: 1; }

.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.4rem; cursor: pointer; }

/* ============================================================
   HERO SECTION
   ============================================================ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 2rem 2rem;
  overflow: hidden;
}

#data-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.4;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 4rem;
}

/* Profile placeholder */
.profile-placeholder {
  flex-shrink: 0;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--surface2);
  border: 2px dashed var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  position: relative;
}

.profile-placeholder span {
  font-family: var(--font-head);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
}

.placeholder-hint {
  font-size: 0.65rem;
  color: var(--muted);
  text-align: center;
  padding: 0 1rem;
  line-height: 1.4;
}

.profile-photo {
  flex-shrink: 0;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent);
}

/* Hero text */
.hero-text { flex: 1; }

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.hero-name {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -1px;
  margin-bottom: 0.75rem;
}

.hero-role {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
}

.typed-text { color: var(--accent2); }

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

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

.hero-tagline {
  font-size: 1rem;
  color: var(--muted);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 2rem;
}

/* CTA buttons */
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 2.5rem;
}

.btn-primary {
  padding: 0.65rem 1.5rem;
  background: var(--accent);
  color: #0a0e1a;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius);
  transition: opacity var(--transition);
}

.btn-primary:hover { opacity: 0.85; }

.btn-secondary {
  padding: 0.65rem 1.5rem;
  background: transparent;
  color: var(--text);
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.btn-secondary:hover { border-color: var(--accent); opacity: 1; }

.btn-outline {
  padding: 0.65rem 1.25rem;
  background: transparent;
  color: var(--accent2);
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid var(--accent2);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition);
}

.btn-outline:hover { background: rgba(129,140,248,0.1); }

/* Resume dropdown */
.resume-dropdown { position: relative; }

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 200px;
  z-index: 50;
  overflow: hidden;
}

.dropdown-menu a {
  display: block;
  padding: 0.65rem 1.25rem;
  font-size: 0.875rem;
  color: var(--text);
  transition: background var(--transition);
}

.dropdown-menu a:hover { background: var(--border); opacity: 1; }

.resume-dropdown:hover .dropdown-menu { display: block; }

/* Stats */
.hero-stats {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.stat { display: flex; flex-direction: column; }

.stat-num {
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin-top: 0.25rem;
}

.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--muted);
  font-size: 1.5rem;
  animation: bounce 2s infinite;
  z-index: 1;
}

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

/* ============================================================
   SHARED SECTION STYLES
   ============================================================ */
section { padding: 6rem 2rem; }
section:nth-child(even) { background: var(--surface); }

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

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3rem;
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent);
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--muted);
  margin-bottom: 1.25rem;
  max-width: 520px;
  font-size: 0.975rem;
}

.skill-group { margin-bottom: 1.5rem; }

.skill-group h4 {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
  text-transform: lowercase;
  letter-spacing: 0.5px;
}

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

.skill-tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.3rem 0.75rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text);
  transition: border-color var(--transition);
}

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

/* ============================================================
   TIMELINE (Education & Experience)
   ============================================================ */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px; top: 8px; bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 3px var(--border);
}

.timeline-content { padding-left: 0.5rem; }

.timeline-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.timeline-header h3 { font-size: 1.05rem; color: var(--text); }

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.timeline-sub {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.timeline-detail {
  font-size: 0.875rem;
  color: var(--muted);
  max-width: 580px;
}

.timeline-bullets {
  list-style: none;
  margin-top: 0.5rem;
}

.timeline-bullets li {
  font-size: 0.875rem;
  color: var(--muted);
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.4rem;
  max-width: 620px;
}

.timeline-bullets li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ============================================================
   PROJECTS SECTION
   ============================================================ */
.project-filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.45rem 1.1rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--muted);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.coming-soon-card { opacity: 0.6; }

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent2);
}

.project-card h3 {
  font-size: 0.975rem;
  color: var(--text);
  line-height: 1.4;
}

.project-card p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.7;
  flex: 1;
}

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

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--muted);
}

.project-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 0.25rem;
}

.project-links a {
  font-size: 0.8rem;
  color: var(--accent);
  font-family: var(--font-mono);
}

.coming-soon {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--muted);
  font-style: italic;
}

/* ============================================================
   CERTIFICATIONS SECTION
   ============================================================ */
.cert-grid { display: grid; gap: 1rem; }

.cert-placeholder {
  padding: 2rem;
  background: var(--surface2);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.cert-placeholder .muted {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.5rem;
  font-family: var(--font-mono);
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.cert-icon { font-size: 1.5rem; }

.cert-info h4 { font-size: 0.95rem; color: var(--text); margin-bottom: 0.25rem; }
.cert-info p { font-size: 0.8rem; color: var(--muted); }
.cert-info a { font-size: 0.8rem; color: var(--accent); margin-top: 0.25rem; display: inline-block; }

/* ============================================================
   LINKS SECTION
   ============================================================ */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color var(--transition);
}

.link-card:hover { border-color: var(--accent); opacity: 1; }

.link-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.link-info h4 { font-size: 0.9rem; color: var(--text); margin-bottom: 0.2rem; }
.link-info p { font-size: 0.78rem; color: var(--muted); }

.resume-link-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: 0.35rem;
}

.resume-link-group a { font-size: 0.78rem; color: var(--accent); }

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-intro {
  font-size: 0.975rem;
  color: var(--muted);
  margin-bottom: 2rem;
  max-width: 420px;
  line-height: 1.8;
}

.contact-items { display: flex; flex-direction: column; gap: 1rem; }

.contact-item { display: flex; flex-direction: column; gap: 0.2rem; }

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
}

.contact-item a,
.contact-item span {
  font-size: 0.9rem;
  color: var(--text);
}

.contact-item a:hover { color: var(--accent); }

/* Contact form */
.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }

.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

.form-group label {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--muted);
}

.form-group input,
.form-group textarea {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 1rem;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border-color var(--transition);
  outline: none;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent); }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
}

.footer-inner p {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.footer-sub { margin-top: 0.4rem; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--surface);
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    gap: 1rem;
  }

  .hero-content { flex-direction: column; text-align: center; gap: 2rem; }
  .hero-tagline { margin: 0 auto 2rem; }
  .hero-cta { justify-content: center; }
  .hero-stats { justify-content: center; }

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

  .timeline-header { flex-direction: column; }
  .projects-grid { grid-template-columns: 1fr; }
  .links-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}