/* ---------- Renkler ve temel değişkenler ---------- */
/* DÜZENLE: --accent sitedeki tek vurgu rengi; az kullanılır. */
:root {
  --bg: #000000;
  --surface: #0d0d0f;
  --text: #f5f5f7;
  --muted: #86868b;
  --border: rgba(255, 255, 255, 0.1);
  --accent: #bf9bff;
  --silver: linear-gradient(180deg, #ffffff 20%, #8e8e93 100%);
  --radius: 28px;
  --max-width: 1080px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
}

/* ---------- Genel ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- Arka planda kayan formüller ---------- */
/* DÜZENLE: --formula-color ile görünürlüğü artırıp azaltabilirsin */
.formulas {
  --formula-color: rgba(255, 255, 255, 0.2);
  position: fixed;
  inset: 0;
  z-index: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  padding: 72px 0 24px;
  overflow: hidden;
  pointer-events: none;
  /* Kenarlarda yumuşakça kaybolsun */
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
}

.formula-row {
  display: flex;
  width: max-content;
  align-items: center;
  white-space: nowrap;
  font-size: clamp(0.85rem, 1.5vw, 1.3rem);
  color: var(--formula-color);
  animation: formula-drift var(--duration, 120s) linear infinite;
  will-change: transform;
}
.formula-row:nth-child(even) { animation-direction: reverse; }
.formula-row > .formula { padding-right: 5.5rem; }

/* Her satırın içeriği iki kez yazılı; yarısı kadar kayınca döngü dikişsiz başa sarar */
@keyframes formula-drift { to { transform: translateX(-50%); } }

@media (prefers-reduced-motion: reduce) {
  .formula-row { animation: none; }
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 20;
  background: var(--text);
  transform: scaleX(var(--scroll, 0));
  transform-origin: left;
}

h1, h2, h3 { line-height: 1.05; margin: 0; letter-spacing: -0.04em; }
h2 { font-size: clamp(2.6rem, 7vw, 5rem); font-weight: 700; margin-bottom: 2rem; }
p { margin: 0 0 1rem; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

.kicker { font-size: 0.95rem; font-weight: 500; color: var(--muted); margin-bottom: 1.25rem; }
.num { font-family: var(--mono); font-size: 0.85rem; color: var(--accent); margin-right: 10px; }

/* ---------- Üst menü ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 52px; }

.logo { font-weight: 600; letter-spacing: -0.02em; text-decoration: none; }

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: 0.82rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-links .nav-cta { padding: 5px 14px; border-radius: 999px; background: var(--text); color: #000; font-weight: 500; }
.nav-links .nav-cta:hover { color: #000; background: #fff; }

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

.lang-toggle {
  padding: 4px 10px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: none;
  color: var(--text);
  font: 500 0.75rem var(--sans);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.2s;
}
.lang-toggle:hover { border-color: var(--text); }

.nav-toggle { display: none; flex-direction: column; gap: 6px; padding: 8px; border: 0; background: none; cursor: pointer; }
.nav-toggle span { width: 20px; height: 1.5px; background: var(--text); }

/* ---------- Kaydırmaya bağlı sahneler ----------
   script.js her [data-pin] bölümüne 0→1 arası --p (ilerleme) değeri yazar.
   Bölüm ekrandan uzun olduğu için içerik ekranda sabit kalır ve --p ile canlanır. */
.pin { position: relative; height: 240vh; --p: 1; }
.pin-inner {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* Sırayla beliren öğeler: --i sıra numarası, --n toplam sayı (script.js yazar) */
[data-stagger] > *, .word {
  --t: clamp(0, calc(var(--p) * var(--n) * 1.4 - var(--i)), 1);
}

/* Ekrana girerken oynayan öğeler: --e 0→1 (script.js yazar) */
[data-enter] { --e: 1; }

/* ---------- Giriş ---------- */
.hero { height: 180vh; --p: 0; }

/* Başlığın arkasında çok hafif bir ışık */
.hero .pin-inner::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(1200px, 140vw);
  height: 560px;
  transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, rgba(191, 155, 255, 0.13), transparent);
  opacity: calc(1 - var(--p));
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  transform: scale(calc(1 + var(--p) * 0.6));
  opacity: calc(1 - var(--p) * 1.7);
  will-change: transform, opacity;
}

.eyebrow { font-family: var(--mono); font-size: 0.95rem; color: var(--muted); margin-bottom: 1rem; }

h1 {
  font-size: clamp(3.2rem, 15vw, 11rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1;
  padding-bottom: 0.08em;
  background: var(--silver);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.role { margin-top: 1.25rem; font-size: clamp(1.15rem, 2.6vw, 1.7rem); font-weight: 500; color: var(--muted); letter-spacing: -0.02em; }

.hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 2.25rem; }

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 0;
  right: 0;
  margin: 0;
  text-align: center;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: calc(0.8 - var(--p) * 6);
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.btn-primary { background: var(--text); color: #000; }
.btn-primary:hover { background: #fff; }
.btn-ghost { border-color: rgba(255, 255, 255, 0.28); }
.btn-ghost:hover { border-color: var(--text); }

/* ---------- Hakkımda ---------- */
.statement-pin { height: 220vh; }

.statement {
  margin: 0;
  font-size: clamp(1.9rem, 6.4vw, 5.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
}
.word { opacity: calc(0.16 + 0.84 * var(--t)); }
.word.hl { color: var(--accent); }

/* ---------- Sözler ---------- */
.quotes-pin { height: 520vh; }

.quotes { position: relative; height: 52vh; }

/* Sahneye dev bir tırnak işaretinin içinden girilir; sonra köşede soluk bir iz olarak kalır */
.quotes-pin .pin-inner::before {
  --in: clamp(0, calc(var(--p) * 9), 1);
  content: "\201C";
  position: absolute;
  left: 4vw;
  top: 6vh;
  font: 700 46vh/1 Georgia, "Times New Roman", serif;
  color: var(--accent);
  opacity: calc(0.6 - var(--in) * 0.46);
  transform: scale(calc(1 + (1 - var(--in)) * 7));
  transform-origin: 30% 30%;
  pointer-events: none;
}

/* Her söz kendi kaydırma diliminde (--q: 0→1) belirir, yükselir ve kaybolur */
.quote {
  --q: calc(var(--p) * var(--n) - var(--i));
  position: absolute;
  inset: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: clamp(0, min(var(--q) * 4, (1 - var(--q)) * 4), 1);
  transform: translateY(calc((0.5 - var(--q)) * 90px));
}
/* İlk söz bölüm başlarken, son söz bölüm biterken görünür kalsın */
.quote:first-child { opacity: clamp(0, (1 - var(--q)) * 4, 1); }
.quote:last-child { opacity: clamp(0, var(--q) * 4, 1); }

.quote blockquote {
  margin: 0;
  max-width: 16em;
  font-size: clamp(2rem, 6.2vw, 5rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.045em;
  padding-bottom: 0.1em;
  background: var(--silver);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.quote figcaption { margin-top: 1.5rem; font-size: 1.05rem; color: var(--muted); }
.quote figcaption::before { content: "— "; color: var(--accent); }

/* ---------- Yetenekler ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }

.skills { display: flex; flex-wrap: wrap; gap: 10px; }
/* Harf harf yazılan başlıklar: bölümün ilk çeyreğinde tamamlanır */
.char-word { display: inline-block; white-space: nowrap; }
.char {
  --c: clamp(0, calc(var(--p) * 3.6 * var(--n) - var(--i)), 1);
  display: inline-block;
  opacity: var(--c);
  transform: translateY(calc((1 - var(--c)) * 0.25em));
}
.typed::after {
  content: "_";
  margin-left: 0.04em;
  color: var(--accent);
  animation: caret 1s steps(1) infinite;
}
@keyframes caret { 50% { opacity: 0; } }

/* Matematik bölümü: ilk --intro kadarı parabol sahnesi, kalanı (--q: 0→1) yetenekler ve girdap */
.math-pin { height: 340vh; --intro: 0.38; }
.soft-pin { height: 360vh; --intro: 0.45; }
.math-pin .pin-inner,
.soft-pin .pin-inner { --q: clamp(0, calc((var(--p) - var(--intro)) / (1 - var(--intro))), 1); }
.math-pin [data-stagger] > *,
.soft-pin .skills > * { --t: clamp(0, calc(var(--q) * var(--n) * 1.4 - var(--i)), 1); }
.math-pin .flow-label { opacity: clamp(0, calc(var(--q) * 4 - 2), 1); }
.math-pin .flow figcaption { opacity: var(--q); }

.parabola {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 2;
  width: min(94vw, 120vh);
  height: 84vh;
  transform: translate(-50%, -50%);
  pointer-events: none;
  /* Parabol tamamlanınca solar ve sahneyi girdaba bırakır */
  opacity: clamp(0, calc((var(--intro) + 0.06 - var(--p)) * 10), 1);
}
.parabola-axes { fill: none; stroke: rgba(255, 255, 255, 0.28); stroke-width: 0.012; opacity: clamp(0, calc(var(--p) * 14), 1); }
.parabola-curve {
  fill: none;
  stroke: url(#parabola-gradient);
  stroke-width: 0.035;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - clamp(0, calc(var(--p) / 0.3), 1));
}
.parabola-tangent { stroke: rgba(255, 255, 255, 0.55); stroke-width: 0.012; opacity: clamp(0, calc(var(--p) * 40), 1); }
.parabola-dot { fill: #fff; opacity: clamp(0, calc(var(--p) * 40), 1); }
.parabola-label {
  font: italic 0.3px "Cambria Math", Cambria, "Times New Roman", serif;
  fill: var(--text);
  opacity: clamp(0, calc((var(--p) - 0.24) * 14), 1);
}

.skills li {
  padding: 9px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.98rem;
  opacity: var(--t);
  transform: translateY(calc((1 - var(--t)) * 28px));
}

.flow { margin: 0; text-align: center; }
.flow-stage { position: relative; width: min(100%, 500px); margin: 0 auto; }
.flow canvas { display: block; width: 100%; aspect-ratio: 1 / 1.05; }

/* Girdap büyük ölçüde çizildikten sonra beliren etiketler */
.flow-label {
  position: absolute;
  font-size: 0.8rem;
  color: var(--muted);
  opacity: clamp(0, calc(var(--p) * 4 - 2), 1);
}
.flow-label-spiral { left: 0; bottom: 8%; }
.flow-label-axial { right: 4%; top: 6%; }

.flow figcaption { margin-top: 12px; font-size: 0.8rem; color: var(--muted); }
.flow-equation { display: block; margin-bottom: 6px; font-family: var(--mono); font-size: 0.9rem; color: var(--text); }

/* Yazılım sahnesi: ilk --intro kadarı ekranın içinden geri çekilme, kalanı başlık ve yetenekler.
   --z: 1 = ekranın içinde (tam yakın), 0 = dizüstü kendi yerinde. --dx, --dy, --s0 değerlerini script.js ölçer. */
.laptop {
  --z: clamp(0, calc(1 - (var(--p) - 0.1) / (var(--intro) - 0.1)), 1);
  --zoom: calc(var(--z) * var(--z));
  position: relative;
  z-index: 2;
  transform:
    translate(calc(var(--dx, 0px) * var(--zoom)), calc(var(--dy, 0px) * var(--zoom)))
    scale(calc(1 + var(--zoom) * (var(--s0, 1) - 1)));
  transform-origin: 50% 40%;
}
.laptop-screen {
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-bottom: 0;
  border-radius: 16px 16px 0 0;
  background: #1c1c1e;
}
.laptop-base {
  position: relative;
  height: 14px;
  margin: 0 -7%;
  border-radius: 2px 2px 14px 14px;
  background: linear-gradient(180deg, #3a3a3d, #151517);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.9);
}
/* Kapağı açmak için tabandaki küçük girinti */
.laptop-base::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 16%;
  height: 5px;
  transform: translateX(-50%);
  border-radius: 0 0 6px 6px;
  background: #0c0c0d;
}

/* Kod, geri çekilme sırasında yazılır; başlık ve etiket ancak dizüstü yerine oturunca gelir */
.soft-pin .code .line { --t: clamp(0, calc(var(--p) / var(--intro) * var(--n) * 1.2 - var(--i)), 1); }
.soft-pin .char { --c: clamp(0, calc(var(--q) * 3.2 * var(--n) - var(--i)), 1); }
.soft-pin .kicker { opacity: clamp(0, calc(var(--q) * 6), 1); }
.soft-pin .typed::after { display: inline-block; transform: scale(clamp(0, calc(var(--q) * 6), 1)); }

/* Projeler başlığı ekrana girerken harf harf yazılır */
.rise .char { --c: clamp(0, calc(var(--e) * 1.25 * var(--n) - var(--i)), 1); }

.terminal {
  border-radius: 8px;
  background: var(--surface);
  overflow: hidden;
}
.terminal-bar { display: flex; align-items: center; gap: 7px; padding: 13px 16px; border-bottom: 1px solid var(--border); }
.terminal-bar i { width: 11px; height: 11px; border-radius: 50%; background: #2c2c2e; }
.terminal-bar span { margin-left: 10px; font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }

.code { margin: 0; padding: 22px; font-family: var(--mono); font-size: clamp(0.72rem, 1.5vw, 0.92rem); line-height: 1.75; color: #d2d2d7; overflow-x: auto; }
.code .line { opacity: var(--t); }
.code .k { color: var(--accent); }
.code .f { color: #ffffff; font-weight: 600; }
.code .s { color: #a1a1a6; }
.code .c { color: #636366; }

/* ---------- Projeler ---------- */
.section { padding-top: 140px; padding-bottom: 40px; }

.rise { opacity: var(--e); transform: translateY(calc((1 - var(--e)) * 60px)); }

.projects { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; perspective: 1200px; }
.projects .card-more { grid-column: 1 / -1; }

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #131315, #0a0a0b);
  transition: border-color 0.3s;
}
.card:hover { border-color: rgba(255, 255, 255, 0.3); }

/* Başlığın altında soldan sağa çizilen ince çizgi */
.rule {
  display: block;
  height: 1px;
  margin: -0.75rem 0 2rem;
  background: linear-gradient(90deg, var(--accent), rgba(255, 255, 255, 0.25) 40%, transparent);
  transform: scaleX(var(--e));
  transform-origin: left;
}

/* Kartlar eğik durumdan açılırken ilki soldan, ikincisi sağdan yerine kayar (--from) */
.tilt {
  opacity: var(--e);
  transform:
    translateX(calc(var(--from, 0) * (1 - var(--e)) * 70px))
    rotateX(calc((1 - var(--e)) * 24deg))
    scale(calc(0.84 + var(--e) * 0.16));
  transform-origin: center top;
}
.projects .card:nth-child(1) { --from: -1; }
.projects .card:nth-child(2) { --from: 1; }

.card-body { display: flex; flex-direction: column; gap: 14px; padding: 40px; }
.card-body h3 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); font-weight: 700; }
.card-body p { color: var(--muted); margin: 0; font-size: 1.05rem; }
.card-kicker { font-size: 0.85rem !important; font-weight: 500; color: var(--accent) !important; }
.card-link { margin-top: 10px; font-weight: 500; text-decoration: none; }
.card-link .arrow { display: inline-block; transition: transform 0.2s; }
.card-link:hover .arrow { transform: translateX(4px); }

.card-more { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; padding: 32px; text-align: center; text-decoration: none; font-weight: 600; }
.card-more-symbol { width: 56px; height: 56px; margin-bottom: 10px; fill: none; stroke: url(#sigma-gradient); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.card-more small { font-family: var(--mono); font-size: 0.78rem; font-weight: 400; color: var(--muted); }

/* ---------- Kapanış ---------- */
/* ---------- İletişim ---------- */
.contact { padding-bottom: 80px; }
.contact-text { max-width: 30rem; font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--muted); margin-bottom: 1.5rem; }
.contact-mail {
  display: inline-block;
  max-width: 100%;
  font-size: clamp(1.5rem, 6.4vw, 4.6rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  padding-bottom: 0.1em;
  overflow-wrap: anywhere;
  text-decoration: none;
  color: var(--text);
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}
.contact-mail:hover { border-color: var(--accent); }
/* Adres, ekrana girerken klavyeden yazılıyormuş gibi harf harf belirir; sonunda imleç yanıp söner */
.contact-mail .char { --c: clamp(0, calc(var(--e) * 1.2 * var(--n) - var(--i)), 1); transform: none; }
.contact-mail::after {
  content: "_";
  color: var(--accent);
  animation: caret 1s steps(1) infinite;
}

.outro { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; }
.zoom { opacity: var(--e); transform: scale(calc(0.6 + var(--e) * 0.4)); }
.outro-title {
  font-size: clamp(4rem, 19vw, 14rem);
  letter-spacing: -0.06em;
  margin-bottom: 0.5rem;
  background: var(--silver);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.outro-sub { font-size: clamp(1rem, 2.2vw, 1.4rem); color: var(--muted); margin-bottom: 2.25rem; }

/* ---------- Alt bilgi ---------- */
.site-footer { padding: 22px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.8rem; }
.site-footer .container { display: flex; justify-content: space-between; align-items: center; }
.site-footer p { margin: 0; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--text); }

/* ---------- Hareket azaltma tercihi ya da çok kısa ekran (ör. yatay telefon):
   sahneler sabitlenmez, her şey normal akışta ve görünür ---------- */
@media (prefers-reduced-motion: reduce), (max-height: 560px) {
  html { scroll-behavior: auto; }
  .pin, .hero, .statement-pin, .quotes-pin { height: auto; }
  .pin-inner { position: static; height: auto; min-height: 70vh; padding: 96px 0; }
  .quotes { height: auto; display: grid; gap: 64px; }
  .quote, .quote:first-child, .quote:last-child { position: static; opacity: 1; transform: none; }
  .laptop { transform: none; }
  .quotes-pin .pin-inner::before { display: none; }
  .scroll-hint { display: none; }
}

/* ---------- Mobil ---------- */
@media (max-width: 760px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 52px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding: 24px;
    background: #000;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1rem; }

  .split { grid-template-columns: 1fr; gap: 24px; }
  .split-reverse > :first-child { order: 2; }
  /* Dar ekranda yazılar formüllerin tam üstüne düşer; okunaklı kalsın diye formüller kısılır */
  .formulas { --formula-color: rgba(255, 255, 255, 0.11); }
  .flow-stage { width: min(62vw, 270px); }
  .flow-label { font-size: 0.68rem; }
  .flow-equation { font-size: 0.72rem; }
  .skills li { padding: 6px 13px; font-size: 0.88rem; }
  h2 { margin-bottom: 1.25rem; }
  .projects { grid-template-columns: 1fr; }
  .card-body { padding: 28px; }
  .section { padding-top: 96px; }
}