/* ==========================================================================
   Dejan Krapež — portfolio site
   ========================================================================== */

:root {
  --bg: #08090c;
  --bg-alt: #0d0f14;
  --surface: #12141a;
  --surface-2: #171a21;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #f3f5f7;
  --text-dim: #9aa2ad;
  --text-faint: #656d78;
  --accent: #3d7dfb;
  --accent-2: #7fb4ff;
  --accent-soft: rgba(61, 125, 251, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  width: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

h1, h2, h3, h4 {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

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

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

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
}

.eyebrow {
  display: inline-block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 18px;
}

section { position: relative; padding: 120px 0; }
section.tight { padding: 90px 0; }

.section-head {
  max-width: 640px;
  margin-bottom: 56px;
}

.section-head h2 {
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  margin-bottom: 18px;
}

.section-head p {
  color: var(--text-dim);
  font-size: 1.05rem;
}

/* ---------- background texture ---------- */

.bg-glow {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-glow::before,
.bg-glow::after {
  content: "";
  position: absolute;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.16;
}

.bg-glow::before {
  top: -220px;
  left: -160px;
  background: var(--accent);
}

.bg-glow::after {
  bottom: -260px;
  right: -180px;
  background: #8b5cf6;
  opacity: 0.1;
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, black 40%, transparent 80%);
  pointer-events: none;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #06070a;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -10px rgba(61, 125, 251, 0.55);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-ghost:hover {
  border-color: var(--accent-2);
  transform: translateY(-2px);
}

/* ---------- nav ---------- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 22px 0;
  transition: padding 0.4s var(--ease), background 0.4s var(--ease), border-color 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  padding: 14px 0;
  background: rgba(8, 9, 12, 0.78);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-brand img {
  height: 48px;
  width: auto;
}

.nav-brand span {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-links a {
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: color 0.25s;
  position: relative;
}

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

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav-links a.active {
  color: var(--text);
}

.nav-links a.active::after {
  transform: scaleX(1);
}

.mobile-menu a.active {
  color: var(--accent-2);
}

.nav-cta { display: flex; align-items: center; gap: 20px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(6, 7, 10, 0.98);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 100px 24px 40px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), visibility 0.35s;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-menu a {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.2rem, 6vw, 1.6rem);
  font-weight: 600;
  flex-shrink: 0;
}

/* ---------- hero ---------- */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  padding-bottom: 80px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 880px;
}

.hero .eyebrow { color: var(--accent-2); }

.hero h1 {
  font-size: clamp(2.6rem, 6.5vw, 4.6rem);
  margin-bottom: 22px;
}

.hero h1 .accent {
  background: linear-gradient(100deg, var(--accent-2), var(--accent) 60%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--text-dim);
  max-width: 620px;
  margin-bottom: 16px;
}

.hero .sub {
  font-size: 1rem;
  color: var(--text-faint);
  max-width: 560px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 48px;
}

.hero-stats .stat b {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.8rem;
  color: var(--text);
}

.hero-stats .stat span {
  font-size: 0.85rem;
  color: var(--text-faint);
}

/* ---------- reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.is-visible > * { transition-delay: calc(var(--i, 0) * 90ms); }

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 72px;
  align-items: start;
}

.about-grid p {
  color: var(--text-dim);
  margin-bottom: 18px;
  font-size: 1.02rem;
}

.about-grid p strong { color: var(--text); font-weight: 600; }

.pull-quote {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.5rem;
  line-height: 1.4;
  padding: 32px;
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ---------- timeline ---------- */

.timeline {
  position: relative;
  padding-left: 32px;
  border-left: 1px solid var(--border-strong);
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.timeline-item .year {
  font-family: "Space Grotesk", sans-serif;
  color: var(--accent-2);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 6px;
  display: block;
}

.timeline-item h4 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-dim);
  max-width: 560px;
}

.timeline-item .project-link {
  margin-top: 14px;
  font-size: 0.9rem;
}

/* ---------- project cards ---------- */

.project-card {
  position: relative;
  border: 1px solid var(--border);
  background: linear-gradient(160deg, var(--surface), var(--bg-alt));
  border-radius: var(--radius);
  padding: 48px;
  margin-bottom: 32px;
  overflow: hidden;
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}

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

.project-card .project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.project-card .project-tag {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  border: 1px solid var(--border-strong);
  padding: 6px 14px;
  border-radius: 999px;
}

.project-card h3 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin-bottom: 6px;
}

.project-card .project-desc {
  color: var(--text-dim);
  max-width: 640px;
  margin-bottom: 28px;
  font-size: 1.02rem;
}

.project-feats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.project-feats li {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.project-feats li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  transform: translateY(-2px);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 3px;
  transition: color 0.25s, border-color 0.25s, gap 0.25s;
}

.project-link:hover {
  color: var(--accent-2);
  border-color: var(--accent-2);
  gap: 12px;
}

/* ---------- AI section ---------- */

.ai-section {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.ai-grid p {
  color: var(--text-dim);
  margin-bottom: 18px;
  font-size: 1.02rem;
}

.ai-equation {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 600;
  text-align: center;
  padding: 56px 32px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: radial-gradient(circle at 50% 0%, rgba(61,125,251,0.12), transparent 70%);
}

.ai-equation span { color: var(--text-faint); }
.ai-equation b { color: var(--accent-2); }

/* ---------- tech stack ---------- */

.tech-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.tech-group {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  background: var(--surface);
}

.tech-group h4 {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 18px;
  font-weight: 600;
}

.tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-pill {
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  color: var(--text);
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}

.tech-pill:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* ---------- work areas ---------- */

.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.work-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  background: var(--surface);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

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

.work-card .num {
  font-family: "Space Grotesk", sans-serif;
  color: var(--accent-2);
  font-size: 0.85rem;
  margin-bottom: 16px;
  display: block;
}

.work-card h4 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.work-card p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ---------- contact ---------- */

.contact {
  text-align: center;
}

.contact h2 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  margin-bottom: 8px;
}

.contact .tagline {
  font-family: "Space Grotesk", sans-serif;
  color: var(--text-faint);
  font-size: 1.1rem;
  margin-bottom: 40px;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 600;
  padding: 20px 40px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease), transform 0.35s var(--ease);
}

.contact-email:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-3px);
}

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand img { height: 22px; opacity: 0.85; }

.footer-brand span {
  font-size: 0.85rem;
  color: var(--text-faint);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 28px;
}

.footer-nav a {
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: color 0.25s;
}

.footer-nav a:hover { color: var(--text); }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .about-grid,
  .ai-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-stats { gap: 32px; }
}

@media (max-width: 760px) {
  .nav-links,
  .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
  section { padding: 80px 0; }
  .project-card { padding: 32px 24px; }
  .hero { padding-top: 120px; }
  .hero-stats { grid-template-columns: repeat(3, auto); gap: 20px; }
  footer .container { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 20px; }
  .hero-stats { grid-template-columns: 1fr; gap: 16px; }
  .contact-email { flex-direction: column; gap: 6px; padding: 24px 28px; }
}