/* ==========================================================================
   Xertex — Yazılım ve Teknoloji Şirketi
   Yön: hassas, teknolojik, premium yazılım markası (Linear/Stripe/Vercel
   seviyesi). Tek sans-serif, near-black + tek indigo vurgu, ince grid,
   gösterişten çok hassasiyet.
   ========================================================================== */

:root {
  --ink: #060608;
  --ink-soft: #0e0e12;
  --ink-line: rgba(255, 255, 255, 0.08);
  --ink-line-strong: rgba(255, 255, 255, 0.14);
  --paper: #fafafb;
  --text-on-ink: #f6f6f8;
  --text-on-ink-soft: rgba(246, 246, 248, 0.56);
  --text-on-ink-faint: rgba(246, 246, 248, 0.36);
  --text-on-paper: #0a0a0d;
  --text-on-paper-soft: rgba(10, 10, 13, 0.58);

  --accent: #4f5bff;
  --accent-light: #7c85ff;
  --accent-dim: rgba(79, 91, 255, 0.14);

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --container: 1240px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--ink);
  color: var(--text-on-ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 36px;
}

h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 700;
  line-height: 1.04;
  margin: 0;
  letter-spacing: -0.03em;
}

p { margin: 0; line-height: 1.7; }
a { color: inherit; text-decoration: none; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-light);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent-light);
}

/* ── Buttons ─────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 28px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.35s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.35s var(--ease);
}
.btn:hover { transform: translateY(-1px); }

.btn-brass {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255,255,255,0.12) inset, 0 8px 20px -8px rgba(79,91,255,0.55);
}
.btn-brass:hover { background: var(--accent-light); box-shadow: 0 1px 0 rgba(255,255,255,0.16) inset, 0 10px 26px -6px rgba(124,133,255,0.6); }

.btn-ghost-light {
  background: rgba(255,255,255,0.03);
  color: var(--text-on-ink);
  border-color: var(--ink-line-strong);
}
.btn-ghost-light:hover { border-color: rgba(255,255,255,0.28); background: rgba(255,255,255,0.06); }

/* ── Header ──────────────────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  padding: 22px 0;
  transition: background 0.4s var(--ease), padding 0.4s var(--ease), border-color 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(6, 6, 8, 0.82);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  padding: 14px 0;
  border-color: var(--ink-line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo-mark { height: 18px; width: auto; }
.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-on-ink-soft);
  transition: color 0.25s var(--ease);
}
.nav-links a:hover { color: var(--text-on-ink); }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-on-ink);
  cursor: pointer;
  padding: 6px;
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(6, 6, 8, 0.98);
    border-top: 1px solid var(--ink-line);
    padding: 8px 36px 22px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 15px 0; border-bottom: 1px solid var(--ink-line); }
  .nav-toggle { display: block; }
}

/* ── Full-screen section shell ───────────────────────────────────────── */
.screen {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 150px 0 100px;
  overflow: hidden;
}
.screen-inner { position: relative; width: 100%; z-index: 2; }
.on-ink { background: var(--ink); color: var(--text-on-ink); }
.on-paper { background: var(--ink-soft); color: var(--text-on-ink); }

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ink-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 25%, black 0%, transparent 75%);
  opacity: 0.7;
  pointer-events: none;
  z-index: 0;
}
.bg-glow {
  position: absolute;
  inset: -10%;
  background: radial-gradient(560px 420px at 15% 12%, rgba(79,91,255,0.16), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.parallax { will-change: transform; }

/* ── Hero ────────────────────────────────────────────────────────────── */
.hero-title {
  font-size: clamp(44px, 7.4vw, 108px);
  line-height: 1.0;
  letter-spacing: -0.035em;
  max-width: 15ch;
}
.hero-title .accent-word { color: var(--accent-light); }
.hero-sub {
  margin-top: 28px;
  max-width: 42ch;
  font-size: clamp(16px, 1.25vw, 18px);
  color: var(--text-on-ink-soft);
  font-weight: 400;
  letter-spacing: -0.005em;
}
.hero-actions {
  margin-top: 42px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-meta-row {
  margin-top: 100px;
  display: flex;
  gap: 56px;
  flex-wrap: wrap;
  border-top: 1px solid var(--ink-line);
  padding-top: 28px;
}
.hero-meta-row .item .num {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-on-ink);
}
.hero-meta-row .item .label {
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--text-on-ink-faint);
}

/* ── Narrative sections ──────────────────────────────────────────────── */
.section-num {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-on-ink-faint);
  margin-bottom: 22px;
}
.big-heading {
  font-size: clamp(32px, 4.4vw, 60px);
  max-width: 16ch;
  letter-spacing: -0.03em;
}
.big-heading.tight { max-width: 13ch; }

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-scale {
  opacity: 0;
  transform: scale(0.96);
  transition: opacity 1.05s var(--ease), transform 1.05s var(--ease);
}
.reveal-scale.is-visible { opacity: 1; transform: scale(1); }

/* Kurumsal — split panel */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 84px;
  align-items: center;
}
.about-copy p { margin-top: 22px; color: var(--text-on-ink-soft); font-size: 16.5px; max-width: 46ch; }
.about-panel {
  position: relative;
  aspect-ratio: 4/5;
  border-radius: 20px;
  border: 1px solid var(--ink-line-strong);
  background:
    linear-gradient(160deg, rgba(79,91,255,0.08), transparent 55%),
    var(--ink-soft);
  overflow: hidden;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.about-panel .panel-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--ink-line) 1px, transparent 1px), linear-gradient(90deg, var(--ink-line) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.6;
}
.about-panel .panel-top {
  position: relative;
  display: flex;
  justify-content: space-between;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-on-ink-faint);
}
.about-panel .panel-dot {
  position: relative;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent-light);
  box-shadow: 0 0 22px 4px rgba(124,133,255,0.55);
}
.about-panel .panel-bottom {
  position: relative;
  font-size: clamp(52px, 6vw, 84px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-on-ink);
}

@media (max-width: 940px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-panel { order: -1; aspect-ratio: 16/9; }
}

/* Çalışma Alanları — precise cards */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
  border-radius: 16px;
  overflow: hidden;
}
.pillar-card {
  background: var(--ink);
  padding: 42px 32px;
  transition: background 0.4s var(--ease);
}
.pillar-card:hover { background: var(--ink-soft); }
.pillar-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--accent-dim);
  color: var(--accent-light);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 26px;
}
.pillar-card h3 { font-size: 19px; margin-bottom: 12px; letter-spacing: -0.02em; }
.pillar-card p { color: var(--text-on-ink-soft); font-size: 14.5px; }

@media (max-width: 900px) {
  .pillar-grid { grid-template-columns: 1fr; }
}

/* Neden Xertex — precise rows */
.value-row {
  display: grid;
  grid-template-columns: 100px 1fr 1.3fr;
  align-items: center;
  gap: 36px;
  padding: 34px 0;
  border-top: 1px solid var(--ink-line);
}
.value-row:last-child { border-bottom: 1px solid var(--ink-line); }
.value-row .num { font-size: 13px; font-weight: 600; color: var(--text-on-ink-faint); }
.value-row h3 { font-size: clamp(19px, 2vw, 24px); letter-spacing: -0.02em; }
.value-row p { color: var(--text-on-ink-soft); font-size: 15px; max-width: 48ch; }

@media (max-width: 780px) {
  .value-row { grid-template-columns: 1fr; gap: 8px; padding: 26px 0; }
}

/* İletişim */
.cta-screen { align-items: center; justify-content: center; text-align: center; }
.cta-screen .big-heading { max-width: 16ch; margin: 0 auto; }
.cta-screen p.lead {
  margin: 24px auto 0;
  max-width: 48ch;
  color: var(--text-on-ink-soft);
  font-size: 16.5px;
}
.cta-actions {
  margin-top: 42px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.contact-meta {
  margin-top: 72px;
  display: flex;
  justify-content: center;
  gap: 52px;
  flex-wrap: wrap;
  border-top: 1px solid var(--ink-line);
  padding-top: 32px;
}
.contact-meta .meta-label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-on-ink-faint);
  margin-bottom: 8px;
}
.contact-meta a, .contact-meta span {
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text-on-ink);
  letter-spacing: -0.01em;
}
.contact-meta a:hover { color: var(--accent-light); }

/* ── Footer ──────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--ink);
  color: var(--text-on-ink-faint);
  padding: 40px 0;
  border-top: 1px solid var(--ink-line);
}
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
}
.footer-logo { height: 15px; opacity: 0.75; }
.footer-links { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.footer-links a { font-size: 12.5px; }
.footer-links a:hover { color: var(--accent-light); }
.footer-copy { font-size: 12px; }

/* ── Skip link / a11y ───────────────────────────────────────────────── */
.skip-link { position: absolute; left: -999px; top: auto; }
.skip-link:focus {
  left: 20px; top: 20px; z-index: 999;
  background: var(--paper); color: var(--ink);
  padding: 10px 16px; border-radius: 8px;
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-scale { transition: none; opacity: 1; transform: none; }
}