/* ==========================================================================
   Base: reset, typography, primitives, header, footer.
   All values come from tokens.css.
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; background: var(--color-bg); scrollbar-gutter: stable; }
body {
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: var(--leading-body);
  font-weight: var(--weight-regular);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
  overflow-x: clip;
}
img, svg, video, canvas, picture { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul[role="list"], ol[role="list"] { list-style: none; }
h1, h2, h3, h4 { font-weight: var(--weight-medium); text-wrap: balance; overflow-wrap: break-word; }
p { text-wrap: pretty; overflow-wrap: break-word; }
[hidden] { display: none !important; }
::selection { background: var(--color-signal); color: var(--color-on-signal); }

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 1.25em; height: 1.25em; flex: none; }

/* ---------- Focus -------------------------------------------------------- */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
main:focus-visible { outline: none; }

.skip-link {
  position: fixed; top: var(--space-3); left: var(--space-3); z-index: var(--z-skip);
  padding: var(--space-3) var(--space-4);
  background: var(--color-signal); color: var(--color-on-signal);
  border-radius: var(--radius-md);
  font-weight: var(--weight-medium);
  transform: translateY(-200%);
  transition: transform var(--dur-base) var(--ease-out);
}
.skip-link:focus-visible { transform: none; }

/* ---------- Layout primitives ------------------------------------------- */
.container {
  width: 100%;
  max-width: calc(var(--container-max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- Type primitives ---------------------------------------------- */
.eyebrow {
  display: flex; align-items: baseline; gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: var(--weight-regular);
  line-height: 1.4;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.eyebrow .idx { color: var(--color-signal-text); font-variant-numeric: tabular-nums; }
.h2 {
  font-family: var(--font-display);
  font-size: var(--step-4);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-medium);
}
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* i18n: English visitors don't see Turkish flash before translation lands.
   Header controls are hidden too so their width change causes no shift. */
.i18n-pending [data-i18n],
.i18n-pending .hero__content,
.i18n-pending .site-nav,
.i18n-pending .site-header__actions { visibility: hidden; }

/* ---------- Buttons ------------------------------------------------------ */
.btn {
  --btn-h: 3rem;
  position: relative;
  isolation: isolate;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: var(--btn-h);
  padding-inline: 1.375rem 1.125rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--step-0);
  line-height: 1.1;
  letter-spacing: -0.005em;
  white-space: nowrap;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-press);
  -webkit-tap-highlight-color: transparent;
}
.btn--sm { --btn-h: 2.5rem; font-size: var(--step--1); padding-inline: 1rem 0.8rem; }
.btn--lg { --btn-h: 3.5rem; padding-inline: 1.75rem 1.375rem; }
.btn .icon { transition: transform var(--dur-base) var(--ease-out); }
.btn:hover .icon { transform: translateX(3px); }
.btn:active { transform: scale(0.97); }

.btn--primary { background: var(--color-signal); color: var(--color-on-signal); }
/* Hover light: a soft "lens" that follows the pointer (x/y set by motion.js,
   centred by default). Opacity + transform only. */
.btn--primary::before {
  content: "";
  position: absolute; z-index: -1;
  left: 0; top: 50%;
  width: 9rem; height: 9rem; margin: -4.5rem 0 0 -4.5rem;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgb(255 255 255 / 0.55), rgb(255 255 255 / 0));
  opacity: 0;
  transform: translate3d(var(--lx, 50%), var(--ly, 0px), 0);
  transition: opacity var(--dur-slow) var(--ease-out);
  pointer-events: none;
}
.btn--primary:hover::before { opacity: 0.45; }
.btn--primary:focus-visible { outline-color: var(--color-signal); }
[data-theme="paper"] .btn--primary:focus-visible { outline-color: var(--color-text); }

/* ---------- Header ------------------------------------------------------- */
.scroll-progress {
  position: fixed; inset: 0 0 auto 0; z-index: calc(var(--z-header) + 1);
  height: 1px;
  background: var(--color-signal);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: var(--z-header);
  height: var(--header-h);
}
.site-header::before {
  content: ""; position: absolute; inset: 0;
  background: rgb(15 13 11 / 0.9);
  border-bottom: 1px solid var(--color-line);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.site-header.is-scrolled::before { opacity: 1; }
@supports (backdrop-filter: blur(1px)) {
  .site-header::before { background: rgb(15 13 11 / 0.78); backdrop-filter: saturate(1.2) blur(14px); }
}
.site-header__inner {
  position: relative;
  height: 100%;
  display: flex; align-items: center; gap: var(--space-6);
}
.brand { display: inline-flex; flex: none; border-radius: var(--radius-sm); }
.brand img { height: 28px; width: auto; }

.site-nav { display: flex; gap: var(--space-6); margin-inline: auto; }
.site-nav a {
  position: relative;
  font-size: var(--step--1);
  color: var(--color-text-2);
  padding-block: var(--space-2);
  transition: color var(--dur-fast) var(--ease-out);
}
.site-nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px;
  background: currentColor;
  transform: scaleX(0); transform-origin: 0 50%;
  transition: transform var(--dur-base) var(--ease-out);
}
.site-nav a:hover { color: var(--color-text); }
.site-nav a:hover::after { transform: scaleX(1); }

.site-header__actions { display: flex; align-items: center; gap: var(--space-4); margin-left: auto; }
.site-nav + .site-header__actions { margin-left: 0; }
.link-login {
  font-size: var(--step--1);
  color: var(--color-text-2);
  padding: var(--space-2) var(--space-1);
  transition: color var(--dur-fast) var(--ease-out);
}
.link-login:hover { color: var(--color-text); }

/* Language switcher */
.language-switcher { position: relative; }
.language-toggle {
  display: inline-flex; align-items: center; gap: 2px;
  height: 2.5rem; padding-inline: var(--space-3) var(--space-2);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono); font-size: var(--step--2); letter-spacing: 0.08em;
  color: var(--color-text-2);
  box-shadow: var(--shadow-hairline);
  transition: color var(--dur-fast) var(--ease-out);
}
.language-toggle:hover { color: var(--color-text); }
.language-toggle .icon { width: 1rem; height: 1rem; transition: transform var(--dur-base) var(--ease-out); }
.language-switcher.open .language-toggle .icon { transform: rotate(180deg); }
.language-dropdown {
  position: absolute; right: 0; top: calc(100% + var(--space-2));
  min-width: 10.5rem;
  padding: var(--space-1);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hairline), var(--shadow-float);
  opacity: 0; transform: translateY(-4px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.language-dropdown.is-open { opacity: 1; transform: none; }
.lang-option {
  display: flex; align-items: center; gap: var(--space-3); width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--step--1);
  color: var(--color-text-2);
  text-align: left;
}
.lang-option:hover, .lang-option:focus-visible { background: var(--color-surface-2); color: var(--color-text); }
.lang-option.active { color: var(--color-text); }
.lang-option .lang-flag { font-family: var(--font-mono); font-size: var(--step--2); letter-spacing: 0.08em; color: var(--color-text-muted); }
.lang-option.active .lang-flag { color: var(--color-signal); }

/* ---------- Motif: contour rule between sections ------------------------ */
.rule {
  position: relative;
  height: 24px;
  color: var(--color-line-strong);
  overflow: hidden;
}
.rule svg { width: 100%; height: 100%; overflow: visible; }
/* Cover that slides away to "draw" the line (transform only). Armed by
   motion.js, so the line stays visible if scripts fail. */
.rule-armed .rule::after {
  content: ""; position: absolute; inset: 0;
  background: var(--color-bg);
  transform: translateX(var(--rule-x, 0%));
}

/* ---------- Footer ------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding-block: var(--space-8) var(--space-7);
  font-size: var(--step--1);
  color: var(--color-text-muted);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "brand . social" "links links copy";
  row-gap: var(--space-7);
  align-items: center;
}
.site-footer .brand { grid-area: brand; }
.social { grid-area: social; display: flex; gap: var(--space-2); }
.social a {
  display: grid; place-items: center;
  width: 2.75rem; height: 2.75rem;
  border-radius: 50%;
  color: var(--color-text-2);
  box-shadow: var(--shadow-hairline);
  transition: color var(--dur-fast) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.social a:hover { color: var(--color-text); transform: translateY(-2px); }
.social .icon { width: 1.125rem; height: 1.125rem; }
.footer-links { grid-area: links; display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); }
.footer-links a { color: var(--color-text-2); transition: color var(--dur-fast) var(--ease-out); }
.footer-links a:hover { color: var(--color-text); text-decoration: underline; text-underline-offset: 3px; }
.copyright { grid-area: copy; justify-self: end; }

/* ---------- Page texture: static film grain (the "noise" of the motif) --- */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: var(--z-overlay);
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .6 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

/* ---------- Responsive --------------------------------------------------- */
@media (max-width: 1100px) {
  .site-nav { display: none; }
  .site-header__actions, .site-nav + .site-header__actions { margin-left: auto; }
}
@media (max-width: 640px) {
  .link-login { display: none; }
  .site-header__actions { gap: var(--space-2); }
  .site-footer__grid { grid-template-columns: 1fr auto; grid-template-areas: "brand social" "links links" "copy copy"; row-gap: var(--space-6); }
  .copyright { justify-self: start; }
}
@media (max-width: 380px) {
  .brand img { height: 24px; }
  .btn--sm { padding-inline: 0.875rem 0.7rem; }
}

/* ---------- Smooth scroll (Lenis) + anchors ------------------------------ */
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
.lenis.lenis-stopped { overflow: hidden; }
section[id] { scroll-margin-top: var(--header-h); }

/* Visually hidden, still read by screen readers */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}