:root {
  --bg:        #0f0e0c;
  --surface:   #1a1915;
  --border:    #2e2c27;
  --accent:    #e8622a;
  --accent-dim:#7a3010;
  --text:      #e8e4dc;
  --muted:     #7a7568;
  --tag-bg:    #1e1d18;
  --tag-border:#2e2c27;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  min-height: 100vh;
  padding: 3rem 1.5rem 5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── Top nav ── */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 860px;
  margin-bottom: 3.5rem;
}

.back-link {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.15s;
}

.back-link:hover { color: var(--accent); }

.back-arrow {
  transition: transform 0.15s;
}

.back-link:hover .back-arrow {
  transform: translateX(-3px);
}

/* ── Lang toggle ── */
.lang-toggle {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.lang-toggle button {
  background: none;
  border: none;
  color: var(--muted);
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  padding: 6px 14px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.lang-toggle button.active {
  background: var(--accent);
  color: #fff;
}

.lang-toggle button:not(.active):hover {
  background: var(--surface);
  color: var(--text);
}

/* ── Card ── */
.card {
  width: 100%;
  max-width: 860px;
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  background: var(--surface);
}

/* ── Hero ── */
.hero {
  padding: 3.5rem 3rem 2.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '🍕';
  position: absolute;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 8rem;
  opacity: 0.06;
  pointer-events: none;
  filter: grayscale(1);
}

.project-index {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.project-title {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.project-title em {
  font-style: italic;
  color: var(--accent);
}

.project-subtitle {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border: 1px solid var(--tag-border);
  border-radius: 2px;
  background: var(--tag-bg);
  color: var(--muted);
  text-transform: uppercase;
}

.tag.accent {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: rgba(232,98,42,0.06);
}

/* ── Demo link in hero ── */
.demo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 2rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--accent-dim);
  border-radius: 2px;
  padding: 8px 16px;
  background: rgba(232,98,42,0.06);
  transition: background 0.2s, border-color 0.2s, gap 0.2s;
}

.demo-link:hover {
  background: rgba(232,98,42,0.12);
  border-color: var(--accent);
  gap: 0.8rem;
}

/* ── Body sections ── */
.sections {
  padding: 0;
}

.section {
  padding: 2rem 3rem;
  border-bottom: 1px solid var(--border);
}

.section:last-child { border-bottom: none; }

.section-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.section-text {
  font-family: 'Syne', sans-serif;
  font-size: 0.95rem;
  line-height: 1.75;
  color: #b8b2a8;
  max-width: 68ch;
}

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

/* ── Two-col specs ── */
.specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 3rem;
}

@media (max-width: 600px) {
  .specs-grid { grid-template-columns: 1fr; }
  .hero { padding: 2rem 1.5rem 2rem; }
  .section { padding: 1.75rem 1.5rem; }
}

.spec-key {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.spec-val {
  font-family: 'Syne', sans-serif;
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.5;
}

/* ── Metric strip ── */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
}

@media (max-width: 500px) {
  .metrics { grid-template-columns: 1fr; }
}

.metric {
  padding: 1.5rem 2rem;
  border-right: 1px solid var(--border);
  text-align: center;
}

.metric:last-child { border-right: none; }

.metric-value {
  font-family: 'Instrument Serif', serif;
  font-size: 2.2rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.metric-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Hidden by lang ── */
[data-lang] { display: none; }
body.pl [data-lang="pl"] { display: block; }
body.en [data-lang="en"] { display: block; }
body.pl .spec-val[data-lang="pl"],
body.en .spec-val[data-lang="en"] { display: block; }
.metric-label[data-lang] { display: none; }
body.pl .metric-label[data-lang="pl"] { display: block; }
body.en .metric-label[data-lang="en"] { display: block; }
.tag-row[data-lang] { display: none; }
body.pl .tag-row[data-lang="pl"] { display: flex; }
body.en .tag-row[data-lang="en"] { display: flex; }
.project-subtitle[data-lang] { display: none; }
body.pl .project-subtitle[data-lang="pl"] { display: block; }
body.en .project-subtitle[data-lang="en"] { display: block; }