/* ═══════════════════════════════════════════
   Martin Červený — Portfolio
   Editorial Swiss Design
   ═══════════════════════════════════════════ */

:root {
  --bg: #0c0c0e;
  --bg-elevated: #141418;
  --surface: #1c1c22;
  --text: #e8e6e1;
  --text-dim: #8a8880;
  --text-muted: #5a584f;
  --accent: #d4ff2b;
  --accent-dim: rgba(212, 255, 43, 0.12);
  --border: #2a2a30;
  --serif: "DM Serif Display", Georgia, serif;
  --mono: "JetBrains Mono", "Fira Code", monospace;
  --sans: "Instrument Sans", "Helvetica Neue", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Grain overlay */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px;
}

a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--accent);
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

/* ─── Header / Nav ─── */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.5rem 3rem;
  background: rgba(12, 12, 14, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.nav-name {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
  white-space: nowrap;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color 0.3s ease;
}

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

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

.nav-short {
  display: none;
}

/* ─── Hero ─── */

.hero {
  padding-top: 7rem !important;
  padding-left: 3rem;
  padding-right: 3rem;
  padding-bottom: 6rem;
}

.hero-inner {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
  animation: fadeUp 0.8s ease both;
}

.hero-name {
  line-height: 0.9;
  margin-bottom: 3rem;
}

.hero-name-line {
  display: block;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(4rem, 12vw, 10rem);
  letter-spacing: -0.02em;
  animation: fadeUp 0.8s ease both;
  animation-delay: 0.15s;
}

.hero-name-accent {
  font-style: italic;
  color: var(--accent);
  animation-delay: 0.3s;
}

.hero-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  animation: fadeUp 0.8s ease both;
  animation-delay: 0.45s;
}

.hero-intro {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 480px;
}

.highlight {
  color: var(--text);
  font-weight: 600;
}

.hero-scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: var(--text-muted);
  animation: scrollPulse 2s ease-in-out infinite;
}

.scroll-text {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ─── Shared Section Layout ─── */

.section-grid {
  max-width: 1400px;
  margin: 0 auto;
  padding: 6rem 3rem;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  border-top: 1px solid var(--border);
}

.section-label {
  position: sticky;
  top: 8rem;
  align-self: start;
}

.label-number {
  display: block;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.label-text {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--text);
}

/* ─── Tech Stack ─── */

.stack-content {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.stack-group {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.stack-group.in-view {
  opacity: 1;
  transform: translateY(0);
}

.stack-title {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 400;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-dim);
  background: var(--bg-elevated);
  transition: all 0.3s ease;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ─── Experience ─── */

.experience-content {
  display: flex;
  flex-direction: column;
}

.exp-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.exp-item.in-view {
  opacity: 1;
  transform: translateY(0);
}

.exp-item:last-child {
  border-bottom: none;
}

.exp-date {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 0.25rem;
}

.exp-details h3 {
  font-family: var(--sans);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.exp-details h3 a {
  position: relative;
}

.exp-details h3 a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.exp-details h3 a:hover::after {
  width: 100%;
}

.exp-role {
  font-size: 0.95rem;
  color: var(--text-dim);
}

/* ─── Projects ─── */

.projects-content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  display: block;
  position: relative;
  padding: 2.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.4s ease;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
}

.project-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-dim), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

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

.project-card:hover::before {
  opacity: 1;
}

.project-arrow {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.4rem;
  color: var(--text-muted);
  transition: all 0.3s ease;
}

.project-card:hover .project-arrow {
  color: var(--accent);
  transform: translate(3px, -3px);
}

.project-name {
  position: relative;
  font-family: var(--sans);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.project-desc {
  position: relative;
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ─── Education ─── */

.education-content {
  display: flex;
  flex-direction: column;
}

.edu-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.edu-item.in-view {
  opacity: 1;
  transform: translateY(0);
}

.edu-item:last-child {
  border-bottom: none;
}

.edu-degree {
  font-family: var(--serif);
  font-size: 1.8rem;
  font-style: italic;
  color: var(--accent);
  padding-top: 0.1rem;
}

.edu-details h3 {
  font-family: var(--sans);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.edu-details h3 a {
  position: relative;
}

.edu-details h3 a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.edu-details h3 a:hover::after {
  width: 100%;
}

.edu-faculty {
  display: block;
  font-size: 0.95rem;
  color: var(--text-dim);
  margin-bottom: 0.3rem;
}

.edu-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ─── Footer ─── */

.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 6rem 3rem 3rem;
}

.footer-heading {
  margin-bottom: 3rem;
}

.footer-heading h2 {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-style: italic;
  color: var(--text);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.footer-link {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}

.footer-link.in-view {
  opacity: 1;
  transform: translateY(0);
}

.footer-link:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.footer-link-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.footer-link-value {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ─── Animations ─── */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollPulse {
  0%,
  100% {
    opacity: 0.3;
    transform: scaleY(0.6);
    transform-origin: top;
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* ─── Responsive ─── */

@media (max-width: 1024px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 4rem 2rem;
  }

  .section-label {
    position: static;
  }

  .hero {
    min-height: auto;
    display: block;
    padding-left: 2rem;
    padding-right: 2rem;
    padding-bottom: 4rem;
  }

  .header {
    padding: 1.25rem 2rem;
  }

  .footer-inner {
    padding: 4rem 2rem 2rem;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero {
    padding-bottom: 3rem;
  }

  .hero-name-line {
    font-size: clamp(3rem, 14vw, 5rem);
  }

  .hero-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }

  .hero-scroll {
    display: none;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .nav-links a {
    font-size: 0.7rem;
  }

  .nav-full {
    display: none;
  }

  .nav-short {
    display: inline;
  }

  .exp-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .edu-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .edu-degree {
    font-size: 1.2rem;
  }

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

@media (max-width: 480px) {
  .header {
    padding: 1rem 1.25rem;
  }

  .hero {
    padding: 0 1.25rem 3rem;
  }

  .section-grid {
    padding: 3rem 1.25rem;
  }

  .footer-inner {
    padding: 3rem 1.25rem 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
  }

  .project-card {
    padding: 1.75rem;
  }
}