/* ============================================================
   Roșian Mihai — portfolio · dark futuristic theme
   ============================================================ */

:root {
  --bg: #0a0e14;
  --bg-2: #0d1420;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-border: rgba(120, 220, 255, 0.14);
  --text: #d7e2ee;
  --text-dim: #93a4b8;
  --cyan: #37e6ff;
  --violet: #a78bfa;
  --glow-cyan: rgba(55, 230, 255, 0.35);
  --glow-violet: rgba(167, 139, 250, 0.3);
  --font-sans: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 4.5rem;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  /* slow shifting gradient under the canvas */
  background-image:
    radial-gradient(ellipse 80% 60% at 20% -10%, rgba(55, 230, 255, 0.08), transparent 60%),
    radial-gradient(ellipse 70% 50% at 90% 30%, rgba(167, 139, 250, 0.09), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 50%, var(--bg) 100%);
  background-size: 200% 200%;
  animation: bg-drift 30s ease-in-out infinite alternate;
}

@keyframes bg-drift {
  from { background-position: 0% 0%; }
  to   { background-position: 100% 100%; }
}

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

/* background canvas grid */
#bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  opacity: 0.55;
  pointer-events: none;
}

/* accessibility */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--cyan);
  color: #04222a;
  padding: 0.5rem 1rem;
  z-index: 100;
  font-weight: 700;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

a { color: var(--cyan); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

/* ============ header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 14, 20, 0.72);
  border-bottom: 1px solid var(--surface-border);
}

.nav {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0.8rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-logo {
  color: var(--cyan);
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  text-shadow: 0 0 12px var(--glow-cyan);
  white-space: nowrap;
}
.nav-logo:hover { text-decoration: none; }

.nav-links {
  display: flex;
  gap: 1.15rem;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}
.nav-links a:hover, .nav-links a:focus-visible {
  color: var(--cyan);
  text-decoration: none;
  text-shadow: 0 0 10px var(--glow-cyan);
}

/* ============ hero ============ */
.hero {
  max-width: 68rem;
  margin: 0 auto;
  padding: clamp(4rem, 12vh, 8rem) 1.25rem 3rem;
  text-align: left;
}

.hero-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
}

.hero-text { flex: 1; min-width: 0; }

.hero-photo { flex-shrink: 0; }

.hero-photo img {
  display: block;
  width: clamp(180px, 22vw, 280px);
  height: auto;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  box-shadow: 0 0 40px rgba(55, 230, 255, 0.22), 0 0 90px rgba(167, 139, 250, 0.16);
}

@media (max-width: 48rem) {
  .hero-grid { flex-direction: column-reverse; align-items: stretch; gap: 2rem; }
  .hero-photo { align-self: center; }
  .hero-photo img { width: 160px; }
}

.hero-boot {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}
.hero-boot .prompt { color: var(--violet); }

.hero-name {
  font-size: clamp(2.4rem, 8vw, 4.75rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: #f2f7fc;
  text-shadow: 0 0 30px rgba(55, 230, 255, 0.18);
}
.hero-name .accent {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-role {
  margin-top: 0.75rem;
  font-size: clamp(1rem, 3vw, 1.35rem);
  color: var(--cyan);
  min-height: 1.6em;
}

.cursor {
  color: var(--cyan);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-tagline {
  margin-top: 1.25rem;
  max-width: 42rem;
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  color: var(--text);
}

.hero-location {
  margin-top: 0.6rem;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.hero-links {
  margin-top: 2rem;
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease, color 0.25s ease;
}
.icon-btn:hover, .icon-btn:focus-visible {
  text-decoration: none;
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 18px var(--glow-cyan), inset 0 0 12px rgba(55, 230, 255, 0.06);
  transform: translateY(-2px);
}

/* ============ sections ============ */
.section {
  max-width: 68rem;
  margin: 0 auto;
  padding: 3.5rem 1.25rem;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  margin-bottom: 1.75rem;
  color: #eef4fa;
}
.section-title .mono {
  font-size: 0.7em;
  vertical-align: middle;
  margin-right: 0.4rem;
  text-shadow: 0 0 12px var(--glow-cyan);
}

/* glassmorphism card */
.glass {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 14px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}
.glass:hover {
  border-color: rgba(55, 230, 255, 0.45);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 24px var(--glow-cyan);
  transform: translateY(-3px);
}

.card { padding: 1.5rem 1.6rem; }
.card p + p { margin-top: 0.7rem; }
.card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
  color: #f2f7fc;
}
.card .at { color: var(--violet); font-weight: 500; }

.card-date {
  font-size: 0.78rem;
  color: var(--cyan);
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

/* ============ timeline ============ */
.timeline {
  list-style: none;
  position: relative;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  opacity: 0.5;
}
.timeline-item { position: relative; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 1.6rem;
  width: 10px;
  height: 10px;
  margin-left: -3.5px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 10px var(--glow-cyan);
}

/* tags */
.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.85rem;
}
.tags li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(167, 139, 250, 0.35);
  color: #c9baf8;
  background: rgba(167, 139, 250, 0.08);
  white-space: nowrap;
}

/* ============ projects ============ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
  gap: 1.25rem;
}
.project h3 a {
  color: #f2f7fc;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}
.project h3 a:hover, .project h3 a:focus-visible {
  color: var(--cyan);
  text-decoration: none;
  text-shadow: 0 0 12px var(--glow-cyan);
}
.ext { color: var(--cyan); font-size: 0.85em; }
.stack {
  margin-top: 0.8rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

/* ============ open source ============ */
.oss {
  border-color: rgba(167, 139, 250, 0.4);
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.08), rgba(55, 230, 255, 0.05));
}
.oss:hover {
  border-color: var(--violet);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 24px var(--glow-violet);
}
.oss-stars {
  font-size: 0.75rem;
  color: var(--violet);
  margin-left: 0.4rem;
}
.oss-list {
  list-style: none;
  margin-top: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.oss-list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}
.badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 200, 90, 0.5);
  color: #ffd47f;
  background: rgba(255, 200, 90, 0.08);
  white-space: nowrap;
}

/* ============ skills ============ */
.skills-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(9.5rem, 1fr));
  gap: 0.7rem;
}
.skills-grid li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-align: center;
  padding: 0.65rem 0.5rem;
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.skills-grid li:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 14px var(--glow-cyan);
  transform: translateY(-2px);
}

/* ============ footer ============ */
.site-footer {
  border-top: 1px solid var(--surface-border);
  padding: 2rem 1.25rem 2.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
}

/* ============ scroll reveal ============ */
/* hidden state only applies once JS has tagged <html class="js">,
   so content stays readable if scripts never run */
html.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
html.js .reveal.visible {
  opacity: 1;
  transform: none;
}

/* ============ reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body { animation: none; }
  #bg-grid { display: none; }
  .cursor { animation: none; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .glass, .icon-btn, .skills-grid li { transition: none; }
  .glass:hover, .icon-btn:hover, .skills-grid li:hover { transform: none; }
}

/* ============ small screens ============ */
@media (max-width: 40rem) {
  .nav { justify-content: center; }
  .nav-links { justify-content: center; gap: 0.9rem; }
  .hero { text-align: center; }
  .hero-links { justify-content: center; }
  .timeline { padding-left: 1.2rem; }
}