/* ============================================================
   Emmanuel Yovo — Embedded Firmware Engineer Portfolio
   Theme: dark / technical / PCB-inspired
============================================================ */

:root {
  --bg: #0a0e14;
  --bg-alt: #0d1420;
  --surface: #111a26;
  --surface-2: #16212f;
  --border: #1f2c3d;
  --border-soft: #182430;
  --text: #dbe4ee;
  --text-dim: #8a9bb0;
  --text-faint: #5a6b80;
  --accent: #4ee0a8;      /* signal green */
  --accent-2: #ffb454;    /* amber / warning trace */
  --accent-3: #5cc8ff;    /* scope blue */
  --danger: #ff6b6b;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 10px;
  --maxw: 1120px;
  --shadow-glow: 0 0 0 1px rgba(78,224,168,0.15), 0 8px 30px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.mono { font-family: var(--mono); }

a { color: inherit; text-decoration: none; }

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

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #04140d; padding: .6rem 1rem;
  z-index: 999; border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; }

/* ---------- decorative background ---------- */
.pcb-bg {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(rgba(78,224,168,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(78,224,168,0.05) 1px, transparent 1px),
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(78,224,168,0.14), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(92,200,255,0.08), transparent);
  background-size: 42px 42px, 42px 42px, 100% 100%, 100% 100%;
  background-position: center;
}

.scanline {
  position: fixed; inset: 0; z-index: 40; pointer-events: none;
  background: repeating-linear-gradient(
    to bottom, rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px,
    transparent 1px, transparent 3px
  );
  mix-blend-mode: overlay;
  opacity: .5;
}

/* ---------- nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(10,14,20,0.72);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: .9rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.logo {
  font-family: var(--mono); font-weight: 700; font-size: 1.05rem;
  color: var(--text); letter-spacing: .5px;
}
.logo-bracket { color: var(--accent); }
.nav-links {
  display: flex; gap: 1.6rem; flex: 1; justify-content: center;
}
.nav-links a {
  font-size: .88rem; color: var(--text-dim); font-weight: 500;
  display: flex; align-items: center; gap: .4rem;
  transition: color .2s ease;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--accent); }
.nav-idx { font-family: var(--mono); color: var(--text-faint); font-size: .72rem; }
.nav-cv { white-space: nowrap; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: .4rem; }
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text); margin: 4px 0;
  transition: transform .2s ease, opacity .2s ease;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .68rem 1.3rem; border-radius: 8px;
  font-weight: 600; font-size: .92rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
}
.btn-primary {
  background: var(--accent); color: #04140d;
  box-shadow: 0 0 0 1px rgba(78,224,168,0.4), 0 8px 24px rgba(78,224,168,0.18);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px rgba(78,224,168,0.6), 0 12px 28px rgba(78,224,168,0.28); }
.btn-ghost {
  background: transparent; color: var(--text); border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-sm { padding: .5rem 1rem; font-size: .85rem; }

/* ---------- hero ---------- */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 7rem 1.5rem 4rem;
  position: relative;
  text-align: center;
}
.hero-inner { max-width: 800px; }
.hero-kicker {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .76rem; letter-spacing: .12em; color: var(--accent);
  background: rgba(78,224,168,0.08); border: 1px solid rgba(78,224,168,0.25);
  padding: .4rem .9rem; border-radius: 999px; margin-bottom: 1.6rem;
}
.dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.hero-title {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 800; letter-spacing: -0.02em; line-height: 1.05;
  margin-bottom: .6rem;
}
.text-accent { color: var(--accent); }

.hero-role {
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  color: var(--text-dim); font-weight: 500; margin-bottom: 1.6rem;
  min-height: 1.6em;
}
.cursor, .cursor2 {
  display: inline-block; color: var(--accent);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  color: var(--text-dim); font-size: 1.05rem; max-width: 640px; margin: 0 auto 2.2rem;
}
.hero-desc strong { color: var(--text); font-weight: 600; }

.hero-cta { display: flex; gap: .9rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.4rem; }

.hero-meta {
  display: flex; gap: .7rem; justify-content: center; flex-wrap: wrap;
  font-size: .82rem; color: var(--text-faint);
}
.hero-meta .sep { color: var(--border); }

.scroll-cue {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2px solid var(--border); border-radius: 14px;
  display: flex; justify-content: center; padding-top: 7px;
}
.scroll-cue span {
  width: 4px; height: 8px; border-radius: 2px; background: var(--accent);
  animation: scrollcue 1.6s ease infinite;
}
@keyframes scrollcue { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(10px); } }

/* ---------- sections ---------- */
.section { padding: 6.5rem 1.5rem; position: relative; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.012), transparent); }
.section-inner { max-width: var(--maxw); margin: 0 auto; }
.section-tag {
  color: var(--accent); font-size: .8rem; letter-spacing: .14em; margin-bottom: .8rem;
}
.section-title {
  font-size: clamp(1.7rem, 3.6vw, 2.3rem); font-weight: 800; letter-spacing: -0.01em;
  margin-bottom: 1rem;
}
.section-sub { color: var(--text-dim); max-width: 640px; margin-bottom: 2.6rem; }
.section-sub a { color: var(--accent); border-bottom: 1px dashed rgba(78,224,168,0.4); }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 3rem; align-items: start; margin-top: 2rem; }
.about-text p { color: var(--text-dim); margin-bottom: 1.1rem; }
.about-text strong { color: var(--text); }

.about-stats { display: flex; gap: 2.2rem; margin-top: 1.8rem; flex-wrap: wrap; }
.stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: .82rem; color: var(--text-faint); }

.terminal {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-glow);
}
.terminal-bar {
  display: flex; align-items: center; gap: .4rem; padding: .7rem .9rem;
  background: var(--surface-2); border-bottom: 1px solid var(--border);
}
.tdot { width: 10px; height: 10px; border-radius: 50%; }
.tdot.r { background: #ff5f56; } .tdot.y { background: #ffbd2e; } .tdot.g { background: #27c93f; }
.terminal-title { margin-left: .6rem; font-size: .78rem; color: var(--text-faint); }
.terminal-body {
  padding: 1.2rem 1.3rem; font-size: .84rem; line-height: 1.75; color: var(--text-dim);
  overflow-x: auto;
}
.c-cmt { color: var(--accent-2); }
.c-key { color: var(--accent-3); }
.c-out { color: var(--accent); }

/* ---------- skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; margin-top: 2rem; }
.skill-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; transition: border-color .2s ease, transform .2s ease;
}
.skill-card:hover { border-color: rgba(78,224,168,0.35); transform: translateY(-3px); }
.skill-head { display: flex; align-items: center; gap: .6rem; margin-bottom: 1rem; }
.skill-icon {
  width: 34px; height: 34px; border-radius: 8px; background: var(--surface-2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); color: var(--accent); font-size: .95rem; flex-shrink: 0;
}
.skill-card h3 { font-size: 1rem; font-weight: 700; }
.chips { display: flex; flex-wrap: wrap; gap: .45rem; }
.chip {
  font-family: var(--mono); font-size: .74rem; color: var(--text-dim);
  background: var(--surface-2); border: 1px solid var(--border);
  padding: .32rem .6rem; border-radius: 6px; white-space: nowrap;
}
.chip-sm { font-size: .7rem; padding: .26rem .55rem; }
.lang-line { margin-top: 2rem; color: var(--text-dim); font-size: .9rem; }

/* ---------- experience timeline ---------- */
.timeline { position: relative; margin-top: 2rem; padding-left: 2.2rem; }
.timeline::before {
  content: ''; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(var(--accent), var(--border));
  opacity: .5;
}
.tl-item { position: relative; margin-bottom: 3rem; }
.tl-item:last-child { margin-bottom: 0; }
.tl-marker {
  position: absolute; left: -2.2rem; top: 6px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(78,224,168,0.1);
}
.tl-date { color: var(--accent-2); font-size: .78rem; letter-spacing: .06em; margin-bottom: .4rem; }
.tl-role { font-size: 1.15rem; font-weight: 700; margin-bottom: .3rem; display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; }
.tl-badge {
  font-family: var(--mono); font-size: .65rem; text-transform: uppercase;
  background: rgba(92,200,255,0.1); color: var(--accent-3); border: 1px solid rgba(92,200,255,0.3);
  padding: .18rem .5rem; border-radius: 5px; font-weight: 600; letter-spacing: .05em;
}
.tl-org { color: var(--text-dim); font-weight: 600; margin-bottom: .7rem; }
.tl-summary { color: var(--text-dim); margin-bottom: .8rem; font-style: italic; }
.tl-list { color: var(--text-dim); padding-left: 1.1rem; margin-bottom: 1rem; }
.tl-list li { margin-bottom: .45rem; }
.tl-list li::marker { color: var(--accent); }
.tl-tags { display: flex; flex-wrap: wrap; gap: .4rem; }

/* ---------- projects ---------- */
.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.3rem; margin-top: 1rem; }
.proj-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; display: flex; flex-direction: column; gap: .8rem;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.proj-card:hover { transform: translateY(-4px); border-color: rgba(78,224,168,0.35); box-shadow: var(--shadow-glow); }
.proj-top { display: flex; align-items: center; justify-content: space-between; }
.proj-icon { font-size: 1.6rem; }
.proj-links a { font-family: var(--mono); font-size: .78rem; color: var(--accent); }
.proj-links a:hover { text-decoration: underline; }
.proj-card h3 { font-size: 1.02rem; font-weight: 700; line-height: 1.35; }
.proj-card p { color: var(--text-dim); font-size: .89rem; flex: 1; }
.proj-card-more { align-items: flex-start; justify-content: center; background: var(--surface-2); border-style: dashed; }

/* ---------- education ---------- */
.edu-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; margin-top: 1rem; }
.edu-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; border-left: 3px solid var(--accent);
}
.edu-date { color: var(--accent-2); font-size: .76rem; margin-bottom: .4rem; }
.edu-card h3 { font-size: 1.02rem; font-weight: 700; margin-bottom: .3rem; }
.edu-school { color: var(--text-dim); font-weight: 600; margin-bottom: .5rem; font-size: .9rem; }
.edu-card p:last-child { color: var(--text-faint); font-size: .88rem; }

/* ---------- contact ---------- */
.contact-inner { text-align: center; }
.contact-inner .section-sub { margin-left: auto; margin-right: auto; }
.contact-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-top: 1rem; max-width: 900px; margin-inline: auto;
}
.contact-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem 1rem; display: flex; flex-direction: column; align-items: center; gap: .5rem;
  transition: transform .2s ease, border-color .2s ease;
}
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.contact-icon {
  width: 40px; height: 40px; border-radius: 50%; background: var(--surface-2);
  display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--accent);
}
.contact-label { font-size: .78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; }
.contact-value { font-family: var(--mono); font-size: .85rem; word-break: break-word; }
.contact-loc { margin-top: 2.2rem; color: var(--text-faint); font-size: .85rem; }

/* ---------- footer ---------- */
.footer { text-align: center; padding: 2.4rem 1.5rem; color: var(--text-faint); font-size: .8rem; border-top: 1px solid var(--border-soft); }

/* ---------- scroll reveal & active nav ---------- */
.reveal-init { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal-in { opacity: 1; transform: translateY(0); }
.nav-links a.active { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  .reveal-init { opacity: 1; transform: none; transition: none; }
  .dot, .cursor, .cursor2, .scroll-cue span { animation: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .edu-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-cv { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-links {
    display: flex; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; background: var(--bg-alt); padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border); gap: 1rem;
  }
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .section { padding: 4.5rem 1.2rem; }
  .hero { padding-top: 8rem; }
}