/* ================================================
   styles.css — Adam Csapody Portfolio
   Dark EE-themed design
   ================================================ */

/* ── CSS Variables ──────────────────────────── */
:root {
  --bg:            #070b14;
  --bg-section:    #090e1a;
  --bg-card:       #0d1424;
  --bg-card-hover: #111929;
  --border:        #1a2035;
  --border-glow:   rgba(0, 212, 255, 0.3);
  --accent:        #00d4ff;
  --accent-dim:    rgba(0, 212, 255, 0.12);
  --accent-glow:   rgba(0, 212, 255, 0.2);
  --accent-2:      #f0a020;   /* PCB trace gold — used sparingly */
  --text:          #dde6f0;
  --text-muted:    #7a8ba0;
  --text-dim:      #3a4a5a;
  --font-sans:     'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', monospace;
  --radius:        10px;
  --radius-sm:     5px;
  --shadow:        0 4px 32px rgba(0, 0, 0, 0.6);
  --transition:    0.22s ease;
  --max-w:         1100px;
}

/* ── Reset ──────────────────────────────────── */
*, *::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-sans);
  line-height: 1.7;
  overflow-x: hidden;
  /* Subtle PCB dot grid */
  background-image:
    radial-gradient(circle, rgba(0, 212, 255, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ── Utility ─────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.75rem; }
.section { padding: 6rem 0; }
.accent { color: var(--accent); }

/* ── Section Titles ──────────────────────────── */
.section-title {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
  letter-spacing: -0.02em;
}
.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.55rem;
  box-shadow: 0 0 10px var(--accent-glow);
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition);
  font-family: var(--font-sans);
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
}
.btn-primary:hover {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}
.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-sm {
  padding: 0.35rem 0.85rem;
  font-size: 0.78rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn-sm:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Nav ─────────────────────────────────────── */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(7, 11, 20, 0.85);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
}
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
  letter-spacing: 0.01em;
}
.nav-links a:hover { color: var(--accent); }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
}

/* ── Hero ─────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 62px;
}

/* Oscilloscope waveform */
.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 120px;
  pointer-events: none;
}

/* Corner circuit traces */
.circuit-corner {
  position: absolute;
  width: 140px;
  height: 140px;
  pointer-events: none;
}
.circuit-tl { top: 62px; left: 0; }
.circuit-br { bottom: 0; right: 0; }

/* Background glow */
.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.07) 0%, transparent 70%);
  top: 50%;
  right: -100px;
  transform: translateY(-50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 660px;
}
.hero-greeting {
  font-size: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}
.hero-name {
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 700;
  line-height: 1.06;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
  color: var(--text);
}
.hero-role {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 1.75rem;
  min-height: 1.8rem;
  letter-spacing: 0.01em;
}
.hero-role::after {
  content: '|';
  color: var(--accent);
  animation: blink 1s step-end infinite;
  margin-left: 1px;
}
@keyframes blink { 50% { opacity: 0; } }
.hero-bio {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 500px;
  margin-bottom: 2.25rem;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 0.85rem; flex-wrap: wrap; }

/* ── About ───────────────────────────────────── */
.about { background: var(--bg-section); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: start;
}
.about-text p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  max-width: 540px;
  line-height: 1.85;
}
.about-stats {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 2rem;
  text-align: center;
  min-width: 155px;
  position: relative;
  overflow: hidden;
}
/* Top glow bar on stat cards */
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 20%; right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.stat-number {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
  line-height: 1;
  text-shadow: 0 0 20px var(--accent-glow);
}
.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.45rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Projects ────────────────────────────────── */
.projects { background: var(--bg); }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}
.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.38rem 1rem;
  border-radius: 999px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

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

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 10%, var(--accent-dim) 40%, var(--accent-dim) 60%, transparent 90%);
  opacity: 0;
  transition: opacity var(--transition);
}
.project-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 212, 255, 0.25);
  box-shadow: var(--shadow), 0 0 30px rgba(0, 212, 255, 0.07);
  background: var(--bg-card-hover);
}
.project-card:hover::before { opacity: 1; }

.project-img {
  width: 100%;
  height: 190px;
  object-fit: cover;
}

/* Schematic-style placeholder */
.project-img-placeholder {
  height: 190px;
  background: linear-gradient(135deg, #0a0f1e 0%, #0e1530 100%);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.project-img-placeholder::before {
  /* Grid lines mimicking PCB/schematic grid */
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.05) 1px, transparent 1px);
  background-size: 20px 20px;
}
.project-img-placeholder::after {
  content: attr(data-label);
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(0, 212, 255, 0.3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.project-body { padding: 1.3rem; flex: 1; display: flex; flex-direction: column; gap: 0.8rem; }
.project-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.5rem; }
.project-title { font-size: 1rem; font-weight: 600; letter-spacing: -0.01em; }
.featured-badge {
  flex-shrink: 0;
  font-size: 0.62rem;
  font-weight: 600;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.25);
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}
.project-desc { font-size: 0.865rem; color: var(--text-muted); flex: 1; line-height: 1.75; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  background: rgba(0, 212, 255, 0.06);
  color: rgba(0, 212, 255, 0.7);
  border: 1px solid rgba(0, 212, 255, 0.15);
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
}
.project-links { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: auto; padding-top: 0.25rem; }
.empty-state { color: var(--text-muted); font-size: 0.9rem; grid-column: 1/-1; text-align: center; padding: 3rem 0; }
.btn-details {
  background: var(--accent-dim);
  border-color: rgba(0, 212, 255, 0.25);
  color: var(--accent);
  margin-left: auto;
}
.btn-details:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* ── Skills ──────────────────────────────────── */
.skills { background: var(--bg-section); }
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}
.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
/* Subtle left trace accent */
.skill-group::before {
  content: '';
  position: absolute;
  top: 20%; bottom: 20%;
  left: 0;
  width: 2px;
  background: linear-gradient(180deg, transparent, var(--accent), transparent);
  border-radius: 1px;
}
.skill-category {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-left: 0.75rem;
}
.skill-list { display: flex; flex-wrap: wrap; gap: 0.5rem; padding-left: 0.25rem; }
.skill-item {
  font-size: 0.82rem;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.28rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.skill-item:hover {
  border-color: var(--accent);
  color: var(--text);
  background: var(--accent-dim);
}

/* ── Contact ─────────────────────────────────── */
.contact { background: var(--bg); text-align: center; }
.contact-subtitle {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-size: 1rem;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}
.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.75rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: all var(--transition);
}
.contact-card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.1);
}
.contact-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ── Footer ──────────────────────────────────── */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ── Scroll Reveal ───────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: none;
}

/* ── Responsive ──────────────────────────────── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 62px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(7, 11, 20, 0.97);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
    padding: 1.5rem 1.75rem;
    gap: 1.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }

  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-stats { flex-direction: row; flex-wrap: wrap; }
  .stat-card { flex: 1; min-width: 110px; padding: 1.1rem; }

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

  .hero { text-align: left; }
  .hero-bio { max-width: 100%; }

  .circuit-corner { width: 90px; height: 90px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .contact-card { width: 100%; justify-content: center; }
}