/* =========================================
   Dark professional theme
   ========================================= */

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

:root {
  --navy:        #0A0F1E;
  --navy-card:   #112240;
  --navy-light:  #1A2744;
  --accent:      #5B6CF9;
  --accent-glow: rgba(91, 108, 249, 0.15);
  --white:       #E6EDF6;
  --white-dim:   #CDD6F0;
  --slate:       #8892B0;
  --border:      rgba(91, 108, 249, 0.2);
  --font-main:   -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  --font-mono:   'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
  --max-w:       1100px;
  --section-gap: 100px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--navy);
  color: var(--white-dim);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--white); }

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

/* --- Utility --- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: var(--section-gap) 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 48px;
  position: relative;
  padding-bottom: 16px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--accent);
}

/* =========================================
   NAV
   ========================================= */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px 0;
  background: rgba(10, 15, 30, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: padding 0.3s;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 36px;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate);
  letter-spacing: 0.05em;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--white); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--slate);
  transition: all 0.3s;
}

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

#hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(91, 108, 249, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 40px;
  height: 1px;
  background: var(--accent);
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 600;
  color: var(--slate);
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}

.hero-desc {
  max-width: 560px;
  color: var(--slate);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 40px;
}

/* Terminal blink — the signature element */
.terminal-block {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--white-dim);
  margin-bottom: 40px;
}

.terminal-prompt { color: var(--accent); }

.cursor {
  display: inline-block;
  width: 9px;
  height: 16px;
  background: var(--accent);
  animation: blink 1.1s step-end infinite;
  vertical-align: middle;
  margin-left: 2px;
}

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

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: #4a5ae8;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(91, 108, 249, 0.35);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent-glow);
  transform: translateY(-2px);
  color: var(--accent);
}

/* =========================================
   ABOUT
   ========================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-text p {
  color: var(--slate);
  margin-bottom: 18px;
  font-size: 1rem;
  line-height: 1.85;
}

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

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 20px;
  text-align: center;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 12px;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

/* =========================================
   SKILLS
   ========================================= */
#skills { background: var(--navy-card); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.skill-category {
  background: var(--navy);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 24px;
  transition: border-color 0.3s, transform 0.3s;
}

.skill-category:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.skill-cat-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.skill-cat-icon {
  font-size: 18px;
}

.skill-cat-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  background: var(--navy-light);
  color: var(--slate);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 4px;
  font-size: 13px;
  font-family: var(--font-mono);
  transition: all 0.2s;
}

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

/* =========================================
   PROJECTS
   ========================================= */
.filter-row {
  display: flex;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--slate);
  padding: 8px 20px;
  border-radius: 4px;
  font-size: 13px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(91, 108, 249, 0.15);
}

.project-header {
  padding: 28px 28px 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.project-icon {
  font-size: 28px;
  line-height: 1;
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-links a {
  color: var(--slate);
  font-size: 16px;
  transition: color 0.2s;
  text-decoration: none;
}

.project-links a:hover { color: var(--accent); }

.project-body {
  padding: 20px 28px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.project-type {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.project-desc {
  color: var(--slate);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 12px;
  flex: 1;
}

.project-duration {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate);
  opacity: 0.7;
  margin-bottom: 20px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.tech-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 4px 10px;
  border-radius: 3px;
  border: 1px solid rgba(91, 108, 249, 0.25);
}

/* =========================================
   EXPERIENCE (Timeline)
   ========================================= */
#experience { background: var(--navy-card); }

.timeline {
  position: relative;
  padding-left: 32px;
}

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

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  border: 2px solid var(--navy-card);
  box-shadow: 0 0 0 2px var(--accent);
}

.exp-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.exp-role {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.exp-duration {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  white-space: nowrap;
  background: var(--accent-glow);
  padding: 3px 10px;
  border-radius: 3px;
  border: 1px solid rgba(91, 108, 249, 0.25);
}

.exp-company {
  font-size: 14px;
  color: var(--slate);
  margin-bottom: 10px;
  font-family: var(--font-mono);
}

.exp-desc {
  color: var(--slate);
  font-size: 14px;
  line-height: 1.75;
}

/* =========================================
   CERTIFICATIONS
   ========================================= */
.cert-group-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  max-width: 780px;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  max-width: 780px;
}

.cert-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 24px;
  text-align: center;
  transition: border-color 0.3s, transform 0.3s;
}

.cert-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.cert-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}

.cert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.cert-date {
  font-size: 12px;
  color: var(--slate);
  font-family: var(--font-mono);
}

.cert-card--badge {
  border-style: dashed;
  border-color: rgba(91, 108, 249, 0.3);
}

.cert-card--badge .cert-icon { filter: saturate(0.7); }

.cert-link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

.cert-link:hover { opacity: 0.75; }

/* =========================================
   FOOTER
   ========================================= */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
}

.footer-inner {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate);
  line-height: 2;
}

.footer-inner a {
  color: var(--slate);
  transition: color 0.2s;
}

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

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 768px) {
  :root { --section-gap: 64px; }

  .container { padding: 0 20px; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--navy);
    border-top: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 20px;
  }

  .nav-links.open { display: flex; }

  .nav-toggle { display: flex; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

  .hero-cta { flex-direction: column; gap: 12px; }

  .btn { width: 100%; justify-content: center; }

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

  .exp-header { flex-direction: column; gap: 8px; }

  .section-title { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 2.2rem; }
  .about-stats { grid-template-columns: 1fr; }
}

/* =========================================
   SCROLL FADE-IN
   ========================================= */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: none;
}