/* ================================
   CUSTOM PROPERTIES
   ================================ */
:root {
  --color-bg:          #0f172a;
  --color-surface:     #1e293b;
  --color-surface2:    #f8fafc;
  --color-accent:      #17bed2;
  --color-accent-dark: #0e9aad;
  --color-text:        #e2e8f0;
  --color-text-dark:   #334155;
  --color-muted:       #94a3b8;
  --color-border:      #334155;
  --color-border-light:#e2e8f0;
  --radius:            8px;
  --radius-lg:         12px;
  --transition:        0.3s ease;
  --shadow:            0 4px 24px rgba(0,0,0,0.10);
  --shadow-dark:       0 4px 24px rgba(0,0,0,0.40);
  --container-width:   1200px;
  --section-pad:       5rem 0;
  --font:              'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ================================
   RESET
   ================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-dark);
  background: var(--color-bg);
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }

/* ================================
   LAYOUT
   ================================ */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section { padding: var(--section-pad); }
.section-light  { background: #fff;                    color: var(--color-text-dark); }
.section-muted  { background: var(--color-surface2);   color: var(--color-text-dark); }
.section-dark   { background: var(--color-bg);         color: var(--color-text);      }

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin-bottom: 2.5rem;
}
.section-title-center { text-align: center; }
.section-dark .section-title { color: var(--color-text); }

/* ================================
   BUTTONS
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), border-color var(--transition),
              color var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}
.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid rgba(255,255,255,0.2);
}
.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.btn-full { width: 100%; justify-content: center; }

/* ================================
   NAVIGATION
   ================================ */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background var(--transition), backdrop-filter var(--transition),
              box-shadow var(--transition);
}
.nav-header.scrolled {
  background: rgba(15,23,42,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  color: var(--color-text);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav-link:hover,
.nav-link.active { color: var(--color-accent); }

.nav-link-cta {
  background: var(--color-accent);
  color: var(--color-bg) !important;
  padding: 0.4rem 1rem;
  margin-left: 0.25rem;
}
.nav-link-cta:hover { background: var(--color-accent-dark); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ================================
   HERO
   ================================ */
.hero {
  min-height: 100vh;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 6rem 1.5rem 4rem;
}

/* subtle dot-grid pattern */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(23,190,210,0.10) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
/* radial fade so text pops */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, transparent 0%, var(--color-bg) 80%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  text-align: center;
}

.hero-eyebrow {
  color: var(--color-muted);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  color: var(--color-text);
  margin-bottom: 0.5rem;
}
.hero-title {
  font-size: clamp(1.15rem, 3vw, 1.65rem);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 1.25rem;
}
.hero-tagline {
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 2rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-muted);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(7px); }
}

/* ================================
   SCROLL ANIMATIONS
   ================================ */
.fade-in {
  animation: fadeInUp 0.9s ease both;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================
   ABOUT
   ================================ */
.about-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3.5rem;
  align-items: start;
}
.about-photo-wrap { display: flex; justify-content: center; }
.about-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 3px solid var(--color-accent);
  flex-shrink: 0;
}
.about-photo-img { width: 100%; height: 100%; object-fit: cover; }
.about-initials { font-size: 3rem; font-weight: 800; color: var(--color-accent); }

.about-content .section-title { margin-bottom: 1.25rem; }
.about-content p {
  color: var(--color-text-dark);
  margin-bottom: 1rem;
  line-height: 1.8;
}
.about-content p:last-child { margin-bottom: 0; }

.about-location {
  display: flex !important;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-muted) !important;
  font-size: 0.875rem;
  margin-top: 1.25rem !important;
}

/* ================================
   SKILLS
   ================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.skill-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition), transform var(--transition);
}
.skill-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.skill-card-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.skill-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.skill-list li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.9rem;
  color: var(--color-text-dark);
  font-weight: 500;
}
.skill-list img { flex-shrink: 0; }
.skill-text-badge {
  background: var(--color-surface2);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-size: 0.8rem;
  color: var(--color-muted);
  font-weight: 500;
  display: inline-block;
}

.currently-learning {
  background: linear-gradient(135deg, rgba(23,190,210,0.07) 0%, transparent 100%);
  border: 1px solid rgba(23,190,210,0.18);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
}
.currently-learning-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}
.learning-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.learning-tag {
  background: rgba(23,190,210,0.10);
  color: var(--color-accent);
  border: 1px solid rgba(23,190,210,0.22);
  border-radius: 100px;
  padding: 0.3rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
}

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

.project-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition),
              box-shadow var(--transition);
}
.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-dark);
}

.project-card-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.project-icon { color: var(--color-accent); flex-shrink: 0; margin-top: 2px; }

.project-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
  font-family: 'Courier New', 'Consolas', monospace;
  word-break: break-word;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  background: rgba(23,190,210,0.10);
  color: var(--color-accent);
  border: 1px solid rgba(23,190,210,0.20);
  border-radius: 4px;
  padding: 0.18rem 0.5rem;
  font-size: 0.73rem;
  font-weight: 600;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: auto;
  padding-top: 0.25rem;
  transition: gap var(--transition);
}
.project-link:hover { gap: 0.6rem; }

/* Legacy projects */
.legacy-projects { margin-top: 2.5rem; }
.legacy-projects-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-muted);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0.5rem 0;
  user-select: none;
  list-style: none;
}
.legacy-projects-toggle:hover { color: var(--color-text); }
.legacy-projects[open] .legacy-projects-toggle { color: var(--color-text); }
.projects-grid-legacy { margin-top: 1.25rem; }
.project-card-legacy { opacity: 0.75; }
.project-card-legacy:hover { opacity: 1; }
.project-card-legacy .project-title { color: var(--color-muted); }

/* ================================
   CERTIFICATIONS
   ================================ */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.cert-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
  padding: 2rem 1.25rem 1.5rem;
  background: var(--color-surface2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition), transform var(--transition),
              border-color var(--transition);
}
.cert-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
  border-color: var(--color-accent);
}
.cert-badge { width: 80px; height: 80px; object-fit: contain; }
.cert-info { display: flex; flex-direction: column; gap: 0.2rem; }
.cert-name { font-size: 0.875rem; font-weight: 700; color: var(--color-text-dark); }
.cert-issuer { font-size: 0.775rem; color: var(--color-muted); }
.cert-verify {
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-top: 0.3rem;
}

.education { border-top: 1px solid var(--color-border-light); padding-top: 2.5rem; }
.education-title {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: 1.5rem;
}
.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  max-width: 680px;
  margin: 0 auto;
}
.education-item {
  text-align: center;
  padding: 1.25rem;
  background: var(--color-surface2);
  border-radius: var(--radius);
  border: 1px solid var(--color-border-light);
}
.education-item h4 { font-size: 0.9rem; color: var(--color-text-dark); margin-bottom: 0.3rem; }
.education-item p  { font-size: 0.825rem; color: var(--color-muted); }

/* ================================
   EXPERIENCE TIMELINE
   ================================ */
.timeline {
  max-width: 780px;
  margin: 0 auto;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 116px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border-light);
}

.timeline-item {
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  position: relative;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::after {
  content: '';
  position: absolute;
  left: 108px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-surface2);
  z-index: 1;
}

.timeline-date {
  text-align: right;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-muted);
  padding-top: 2px;
  line-height: 1.4;
}
.timeline-role {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.2rem;
}
.timeline-org {
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
}
.timeline-bullets {
  list-style: disc;
  padding-left: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.timeline-bullets li {
  font-size: 0.875rem;
  color: var(--color-text-dark);
  line-height: 1.55;
}

/* ================================
   CONTACT
   ================================ */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: start;
}
.contact-info .section-title { color: var(--color-text); }
.contact-tagline {
  color: var(--color-muted);
  line-height: 1.75;
  margin-bottom: 1.25rem;
  font-size: 0.975rem;
}
.contact-location {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-row { display: flex; flex-direction: column; gap: 0.4rem; }
.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.form-input {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  color: var(--color-text);
  font: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  width: 100%;
}
.form-input::placeholder { color: rgba(148,163,184,0.45); }
.form-input:focus { outline: none; border-color: var(--color-accent); }
.form-textarea { resize: vertical; min-height: 130px; }

.captcha-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}
.captcha-display {
  font-family: 'Courier New', 'Consolas', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: var(--color-accent);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  user-select: none;
  min-width: 160px;
  text-align: center;
}
.captcha-refresh {
  color: var(--color-muted);
  font-size: 1.3rem;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius);
  transition: color var(--transition), transform var(--transition);
  line-height: 1;
}
.captcha-refresh:hover { color: var(--color-accent); transform: rotate(180deg); }
.captcha-error {
  display: block;
  font-size: 0.8rem;
  color: #f87171;
  min-height: 1.2em;
  margin-top: 0.3rem;
}

/* ================================
   FOOTER
   ================================ */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-copy { font-size: 0.85rem; color: var(--color-muted); }
.footer-links { display: flex; align-items: center; gap: 1rem; }
.footer-links a { color: var(--color-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--color-accent); }

/* ================================
   BACK TO TOP
   ================================ */
.back-to-top {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition),
              background var(--transition);
  z-index: 999;
  pointer-events: none;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover { background: var(--color-accent-dark); }

/* ================================
   RESPONSIVE — TABLET (≤1024px)
   ================================ */
@media (max-width: 1024px) {
  .skills-grid       { grid-template-columns: repeat(2, 1fr); }
  .projects-grid     { grid-template-columns: repeat(2, 1fr); }
  .certs-grid        { grid-template-columns: repeat(2, 1fr); }
}

/* ================================
   RESPONSIVE — MOBILE (≤768px)
   ================================ */
@media (max-width: 768px) {
  :root { --section-pad: 3.5rem 0; }

  /* Nav mobile */
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    z-index: 1000;
  }
  .nav-links.open { display: flex; }
  .nav-link { font-size: 1.2rem; }

  /* Hero */
  .hero { padding-top: 5rem; }
  .hero-actions { flex-direction: column; align-items: center; }

  /* About */
  .about-grid { grid-template-columns: 1fr; gap: 2rem; text-align: center; }
  .about-photo-wrap { justify-content: center; }
  .about-location { justify-content: center; }

  /* Skills */
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .currently-learning { padding: 1.25rem; }

  /* Projects */
  .projects-grid { grid-template-columns: 1fr; }

  /* Certs */
  .certs-grid { grid-template-columns: repeat(2, 1fr); }

  /* Timeline */
  .timeline::before { left: 0; }
  .timeline-item { grid-template-columns: 1fr; padding-left: 1.75rem; gap: 0.4rem; }
  .timeline-item::after { left: -8px; }
  .timeline-date { text-align: left; }

  /* Contact */
  .contact-wrap { grid-template-columns: 1fr; gap: 2rem; }

  /* Education */
  .education-grid { grid-template-columns: 1fr; }

  /* Footer */
  .footer-inner { flex-direction: column; gap: 1rem; text-align: center; }
}

/* ================================
   RESPONSIVE — SMALL (≤480px)
   ================================ */
@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
  .certs-grid  { grid-template-columns: 1fr; }
  .hero-name   { font-size: 2.25rem; }
  .hero-tagline { font-size: 0.95rem; }
}