/* ==========================================================
   Tokens
   ========================================================== */
:root {
  --bg: #0B0F14;
  --panel: #121822;
  --panel-border: #202B38;
  --text: #E7EDF3;
  --text-dim: #8996A6;
  --text-faint: #5C6878;

  --accent-green: #5FD9A6;   /* CAN_H */
  --accent-blue: #5AA9E6;    /* CAN_L */
  --accent-amber: #E8A33D;   /* status */

  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius: 6px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* Scrolling STM32 code background (left half) */
.bg-code {
  position: fixed;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.bg-code pre {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  margin: 0;
  padding: 40px 4vw;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--accent-green);
  opacity: 0.055;
  white-space: pre;
  will-change: transform;
}

/* Scrolling schematic background (right half) */
.bg-schematic-wrap {
  position: fixed;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.bg-schematic {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 2820px;
  opacity: 0.07;
  will-change: transform;
}

.bgs-frame {
  fill: none;
  stroke: var(--text-faint);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.bgs-line {
  fill: none;
  stroke: var(--accent-blue);
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}

.bgs-line.bgs-chip { stroke-width: 1.4; }

.bgs-alt { stroke: var(--accent-green); }
.bgs-alt2 { stroke: var(--accent-amber); }

.bgs-diode {
  fill: var(--accent-blue);
  stroke: var(--accent-blue);
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}

.bgs-node {
  fill: var(--accent-amber);
  stroke: none;
}

.bgs-label {
  font-family: var(--font-mono);
  font-size: 15px;
  fill: var(--text);
  letter-spacing: 0.05em;
}

.bgs-label.bgs-sub {
  font-size: 11px;
  fill: var(--text-dim);
  letter-spacing: 0.03em;
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent-green);
  color: var(--bg);
  padding: 8px 16px;
  z-index: 100;
}
.skip-link:focus { left: 24px; top: 24px; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 3px;
}

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--accent-blue);
  margin: 0 0 12px;
}

h1, h2, h3 {
  font-family: var(--font-mono);
  font-weight: 600;
  line-height: 1.15;
  margin: 0;
}

h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  margin-bottom: 32px;
  letter-spacing: -0.01em;
}

p { color: var(--text-dim); margin: 0 0 16px; }

.hero-desc,
.about-grid p,
.contact-desc {
  text-justify: inter-word;
  hyphens: auto;
}

/* ==========================================================
   Header / Nav
   ========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--panel-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  color: var(--text);
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  color: var(--text-dim);
  transition: color 0.15s ease;
}

.site-nav a:hover { color: var(--accent-green); }

/* ==========================================================
   Hero
   ========================================================== */
.hero {
  padding: 96px 0 64px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(32px, 5vw, 52px);
  margin-bottom: 8px;
}

.role {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-size: 15px;
  margin-bottom: 20px;
}

.hero-desc {
  max-width: 52ch;
  font-size: 16px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  padding: 12px 20px;
  border-radius: var(--radius);
  display: inline-block;
  border: 1px solid transparent;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.btn-primary {
  background: var(--accent-green);
  color: #06120C;
}
.btn-primary:hover { transform: translateY(-1px); }

.btn-ghost {
  border-color: var(--panel-border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent-blue); color: var(--accent-blue); }

.photo-frame {
  width: 176px;
  height: 176px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 1px solid var(--panel-border);
  background: var(--panel);
}

/* ==========================================================
   Sections (shared)
   ========================================================== */
.section {
  padding: 64px 0;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 900px;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 44px;
}

.skill-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color 0.15s ease;
}

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

.skill-title {
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 10px;
}

.skill-desc {
  font-size: 13.5px;
  margin: 0;
}

.col-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-amber);
  letter-spacing: 0.04em;
  margin: 0 0 18px;
}

.highlights-label {
  margin-top: 4px;
}

.highlight-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 780px;
}

.highlight-list li {
  font-size: 14.5px;
  color: var(--text);
  padding-left: 20px;
  position: relative;
}

.highlight-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--accent-green);
  border-radius: 50%;
}

/* Contact */
.contact-inner {
  text-align: center;
}

.contact-inner .eyebrow,
.contact-inner h2 {
  text-align: left;
}

.contact-desc {
  max-width: 100%;
  margin: 0;
  text-align: left;
  text-align-last: left;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 28px;
  text-align: left;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: var(--panel);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.contact-card:hover,
.contact-card:focus-visible {
  border-color: var(--accent-green);
  background: rgba(95, 217, 166, 0.06);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -12px rgba(95, 217, 166, 0.5);
}

.contact-card--primary {
  grid-column: 1 / -1;
  border-color: var(--accent-green);
  background: rgba(95, 217, 166, 0.07);
}

.cc-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.cc-label {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
}

.cc-desc {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cc-arrow {
  flex-shrink: 0;
  font-family: var(--font-mono);
  color: var(--text-faint);
  transition: transform 0.2s ease, color 0.2s ease;
}

.contact-card:hover .cc-arrow { color: var(--accent-green); transform: translateX(3px); }

@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; }
  .contact-card--primary { grid-column: 1 / -1; }
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 640px) {
  .hero-inner { grid-template-columns: 1fr; text-align: left; }
  .hero-photo { order: -1; }
  .photo-frame { width: 120px; height: 120px; }
  .site-nav { gap: 16px; }
}