:root {
  --bg: #E8E4DC;
  --ink: #1E1C1A;
  --accent: #C4501E;
  --accent-ink: #A83E12; /* darker copper for small text, ~4.93:1 on --bg (WCAG AA) */
  --font-display: "Space Grotesk", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-display);
  /* hafif kağıt dokusu: iki katmanlı radial-gradient noise hissi */
  background-image: radial-gradient(rgba(30,28,26,0.035) 1px, transparent 1px);
  background-size: 4px 4px;
  overflow-x: hidden;
}
.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.35em;
  color: var(--accent-ink);
}
section { min-height: 60vh; padding: 8rem clamp(1.5rem, 8vw, 8rem); }

a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.1; }

/* başlık vurgusu — hilbert tarzı koyu blok */
.highlight { background: var(--ink); color: var(--bg); padding: 0 0.2em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }

/* ---------- network canvas layering ---------- */
#network { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
main, footer { position: relative; z-index: 1; }
/* .topbar zaten sabit; z-index: 100 canvas'ın (z-index: 0) üzerinde — ek değişiklik gerekmiyor */

/* ---------- topbar ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.1rem clamp(1.5rem, 6vw, 4rem);
  background: rgba(232, 228, 220, 0.82);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(30, 28, 26, 0.15);
}
.topbar__name {
  font-weight: 700;
  font-size: 1.05rem;
  white-space: nowrap;
}
.topbar__nav {
  display: flex;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}
.topbar__nav a {
  opacity: 0.75;
  transition: opacity 0.2s, color 0.2s;
}
.topbar__nav a:hover { opacity: 1; color: var(--accent-ink); }
.topbar__lang {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.topbar__lang span { opacity: 0.4; }
.lang-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink);
  opacity: 0.5;
  cursor: pointer;
  padding: 0.15rem 0.2rem;
}
.lang-btn.is-active { opacity: 1; color: var(--accent-ink); }
.progress-line {
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
}

/* ---------- hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.25rem;
  padding-top: 6rem;
}
.hero__title {
  font-size: clamp(3rem, 10vw, 8rem);
  letter-spacing: -0.02em;
}
.hero__route {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: var(--ink);
  opacity: 0.75;
}
.hero__arrow { color: var(--accent); }
.hero__tagline {
  max-width: 36rem;
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  opacity: 0.85;
}
.hero__scroll {
  margin-top: 2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--accent-ink);
  width: fit-content;
  border-bottom: 1px solid var(--accent-ink);
  padding-bottom: 0.2rem;
}

/* ---------- journey ---------- */
.journey h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin: 1rem 0 4rem;
  max-width: 40rem;
}
.journey__track {
  position: relative;
  max-width: 42rem;
  margin-left: clamp(1rem, 4vw, 3rem);
  padding-left: clamp(2rem, 5vw, 3.5rem);
  display: flex;
  flex-direction: column;
  gap: 5rem;
}
.journey__line {
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 2px;
  height: 100%;
}
.journey__line path {
  stroke: var(--ink);
  stroke-width: 2;
  fill: none;
  opacity: 0.25;
}
/* dev arka plan şehir tipografisi */
.journey__bgcity {
  position: sticky;
  top: 30vh;
  height: 0;
  overflow: visible;
  font-size: clamp(4rem, 18vw, 14rem);
  font-weight: 700;
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
  line-height: 1;
  z-index: -1;
}
.stop {
  position: relative;
}
.stop::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(2rem, 5vw, 3.5rem));
  top: 0.4em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  transform: translateX(-4px);
}
.stop__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  opacity: 0.6;
  margin-bottom: 0.5rem;
}
.stop h3 { font-size: clamp(1.3rem, 2.5vw, 1.75rem); margin-bottom: 0.75rem; }
.stop p:not(.stop__meta):not(.stop__tags) { max-width: 34rem; opacity: 0.85; margin-bottom: 0.9rem; }
.stop__tags {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  opacity: 0.55;
}

/* ---------- work / cards ---------- */
.work h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); margin: 1rem 0 3rem; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.card {
  position: relative;
  border: 1px solid var(--ink);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform 0.25s, border-color 0.25s;
}
/* kart köşe nişanları */
.card::before, .card::after {
  content: "+";
  position: absolute;
  font-family: var(--font-mono);
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
}
.card::before { top: -0.55em; left: -0.35em; }
.card::after  { bottom: -0.55em; right: -0.35em; }
.card:hover::before, .card:hover::after { opacity: 1; }
.card:hover { border-color: var(--accent); transform: translateY(-4px); }
.card h3 { font-size: 1.2rem; }
.card p { opacity: 0.85; flex-grow: 1; }
.card__tags {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  opacity: 0.55;
}
.card a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent-ink);
  width: fit-content;
}

/* ---------- toolbox ---------- */
.toolbox h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); margin: 1rem 0 3rem; }
.toolbox__groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  border-top: 1px solid rgba(30, 28, 26, 0.2);
  padding-top: 2rem;
}
.toolgroup h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent-ink);
  margin-bottom: 0.6rem;
}
.toolgroup p { font-size: 1rem; opacity: 0.85; }
.toolbox__spoken {
  margin-top: 3rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  opacity: 0.7;
}

/* ---------- contact ---------- */
.contact h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); margin: 1rem 0 1rem; }
.contact p { max-width: 34rem; opacity: 0.85; margin-bottom: 2.5rem; }
.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}
.contact__links a {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 500;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 0.15rem;
  transition: color 0.2s, border-color 0.2s;
}
.contact__links a:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- footer ---------- */
.footer {
  padding: 2.5rem clamp(1.5rem, 8vw, 8rem);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  opacity: 0.55;
  border-top: 1px solid rgba(30, 28, 26, 0.15);
}

/* ---------- mobile ---------- */
@media (max-width: 640px) {
  section { padding: 4rem 1.25rem; }
  .topbar { padding: 1rem 1.25rem; gap: 1rem; }
  .topbar__nav { display: none; }
  .hero { padding-top: 4rem; }
  .journey__track { margin-left: 0.5rem; padding-left: 1.75rem; gap: 3.5rem; }
  .journey__bgcity { display: none; }
  .cards { grid-template-columns: 1fr; }
  .toolbox__groups { grid-template-columns: 1fr; }
  .contact__links { flex-direction: column; gap: 1.25rem; }
  .footer { padding: 2rem 1.25rem; }
}