/* =============================================================================
   Avielon Studio · site.css
   Global foundation (base reset, type utilities, buttons) + site chrome
   (header, mega menus, footer, mobile menu). Loaded after tokens.css on every page.
   Page-specific section styles live with their own view, not here.
============================================================================= */

/* ---- Base ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 1rem; line-height: 1.65;
  font-feature-settings: "kern", "liga", "calt";
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
  transition: background-color .4s ease, color .4s ease;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; } body { transition: none; }
}
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); }

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--color-focus-ring); outline-offset: 3px; border-radius: 2px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--color-accent); color: var(--color-on-accent);
  padding: .65rem 1rem; z-index: 200; border-radius: var(--radius);
  font-family: var(--font-mono); font-size: .8rem;
}
.skip-link:focus { left: 1rem; top: 1rem; color: var(--color-on-accent); }

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

/* ---- Type utilities (global, reused across pages) ---- */
/* ---- Eyebrow (section kicker / sub-service breadcrumb) ----------------------
   Mono, uppercase, tracked. The WHOLE eyebrow is accent-toned; it opens the line
   directly with NO leading glyph or number. Two shapes:
     - Simple label:  <p class="eyebrow">Bakis acisi</p>
     - Sub-service breadcrumb (parent hub -> current page):
         <p class="eyebrow">
           <a class="eyebrow__parent" href="/hizmetler/tasarim">Tasarim</a>
           <span class="eyebrow__sep">&#183;</span>
           <span class="eyebrow__leaf">Kurumsal web sitesi</span>
         </p>
   The current page (leaf) carries the full accent; the parent is a quieter link
   to the hub; the separator is muted -- so the hierarchy reads at a glance.     */
.eyebrow {
  font-family: var(--font-mono); font-size: .75rem; font-weight: 500; line-height: 1.4;
  letter-spacing: .18em; text-transform: uppercase; color: var(--color-accent); margin: 0;
}
.eyebrow__parent { color: var(--color-text-secondary); transition: color .2s ease; }
.eyebrow__parent:hover { color: var(--color-accent); }
.eyebrow__sep { color: var(--color-text-secondary); margin-inline: .5ch; }
.eyebrow__leaf { color: var(--color-accent); }
/* Deprecated: the old leading "\2014 / \00B7" prefix. Hidden so any legacy
   <span class="mark"> shows no glyph until it is removed from the view. New
   breadcrumbs use .eyebrow__sep for the middle separator instead.              */
.eyebrow .mark { display: none; }
.t-display {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(2.75rem, 1.6rem + 4vw, 4.5rem); line-height: 1.05;
  letter-spacing: -0.02em; margin: 0; font-optical-sizing: auto;
}
.t-h2 {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.75rem, 1.3rem + 1.6vw, 2.25rem); line-height: 1.15;
  letter-spacing: -0.01em; margin: 0;
}
.t-h3 {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.4rem, 1.1rem + 1vw, 1.75rem); line-height: 1.2;
  letter-spacing: -0.01em; margin: 0;
}
.t-h4 { font-family: var(--font-body); font-weight: 600; font-size: 1.125rem; line-height: 1.35; margin: 0; }
.lead { font-size: clamp(1.05rem, .98rem + .4vw, 1.25rem); line-height: 1.6; color: var(--color-text-secondary); max-width: 56ch; }
.body { color: var(--color-text-secondary); max-width: 64ch; }
.body strong { color: var(--color-text-primary); font-weight: 600; }
.small { font-size: .875rem; line-height: 1.55; }

/* ---- Buttons ---- */
.cta {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font-family: var(--font-body); font-weight: 600; font-size: .92rem; line-height: 1;
  padding: .8rem 1.3rem; border-radius: var(--radius); cursor: pointer;
  border: 1px solid transparent; white-space: nowrap;
  transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease;
}
.cta-primary { background: var(--color-accent); color: var(--color-on-accent); }
.cta-primary:hover { background: var(--color-accent-hover); color: var(--color-on-accent); transform: translateY(-1px); }
.cta-ghost { background: transparent; color: var(--color-text-primary); border-color: var(--color-border); }
.cta-ghost:hover { border-color: var(--color-text-primary); color: var(--color-text-primary); }
/* Quiet / low-commitment link-button (e.g. "İşlerimizi İnceleyin"). Text + arrow, no fill. */
.cta-quiet { background: transparent; border-color: transparent; color: var(--color-accent); padding-inline: 0; }
.cta-quiet:hover { color: var(--color-accent-hover); transform: none; }
.cta-quiet .arr { transition: transform .2s ease; }
.cta-quiet:hover .arr { transform: translateX(3px); }
/* Size modifiers */
.cta--sm { padding: .55rem 1rem; font-size: .82rem; }
.cta--lg { padding: 1rem 1.6rem; font-size: 1rem; }
@media (prefers-reduced-motion: reduce) { .cta:hover, .cta-quiet:hover .arr { transform: none; } }

/* =============================================================================
   SECTION BACKGROUND SYSTEM
   Opt-in page rhythm. Apply to a section wrapper; alternate base ↔ alt down a
   page, and reserve --contrast / --gradient for one or two emphasis moments.
   --contrast remaps the colour tokens LOCALLY, so any component inside
   (.card, .cta, .eyebrow, links) inverts automatically — no per-element work,
   and it stays correct in both themes because the tokens resolve per theme.
============================================================================= */
.section { padding-block: var(--section-y); background: var(--color-section); scroll-margin-top: var(--section-y); }
.section:nth-child(odd) { background: var(--color-section); }
.section:nth-child(even) { background: var(--color-section-alt); }
.section.section--alt { background: var(--color-section-alt); }
.section.section--bgalt:nth-child(odd) { background: var(--color-section-alt); }
.section.section--bgalt:nth-child(even) { background: var(--color-section);}

.section.section--contrast {
  background: var(--color-contrast-bg);
  color: var(--color-contrast-text);
  --color-background: var(--color-contrast-bg);
  --color-surface: var(--color-contrast-surface);
  --color-surface-elevated: var(--color-contrast-surface);
  --color-text-primary: var(--color-contrast-text);
  --color-text-secondary: var(--color-contrast-text-2);
  --color-border: var(--color-contrast-border);
  --color-accent: var(--color-contrast-accent);
  --color-accent-hover: var(--color-contrast-accent-hover);
  --color-on-accent: var(--color-contrast-on-accent);
  --color-focus-ring: var(--color-contrast-accent);
}

/* Gradient emphasis — hero + the occasional important section.
   --gradient-flat drops the teal glow for a purely neutral wash. */
.section--gradient { background: var(--gradient-hero-glow); }
.section--gradient-flat { background: var(--gradient-hero); }

/* =============================================================================
   HEADER
   Layout: 3-column grid — brand (left) · nav (centre) · tools (right).
   The header is the containing block for the full-width mega panels
   (position: sticky establishes it), so panels drop from the header's bottom edge.
============================================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--color-background) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
@supports not (backdrop-filter: blur(1px)) { .site-header { background: var(--color-background); } }

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  column-gap: 1.5rem;
  min-height: 68px;
}
.brand {
  grid-column: 1; justify-self: start;
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--font-display); font-weight: 500; font-size: 1.05rem;
  color: var(--color-text-primary); letter-spacing: -0.01em; white-space: nowrap;
}
.brand:hover { color: var(--color-text-primary); }
.brand .glyph { width: 22px; height: 22px; flex: none; }
.brand .sub {
  font-family: var(--font-mono); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--color-text-secondary); border-left: 1px solid var(--color-border);
  padding-left: .55rem; margin-left: .15rem;
}

.nav-links { grid-column: 2; justify-self: center; display: flex; align-items: center; gap: 1.6rem; margin: 0; list-style: none; padding: 0; }
.nav-links > li { position: static; margin: 0; }
.nav-item { position: static; }

.nav-link { display: inline-flex; align-items: center; gap: .32rem; color: var(--color-text-secondary); font-size: .92rem; font-weight: 500; padding: .4rem 0; position: relative; }
.nav-link .caret { width: 12px; height: 12px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; opacity: .65; transition: transform .25s ease, opacity .2s ease; }
/* Accent underline: shown on hover, on the active page, and while the mega is open. */
.nav-link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1.5px;
  background: var(--color-accent);
  transform: scaleX(0); transform-origin: left; transition: transform .2s ease;
}
.nav-link:hover, .nav-link[aria-current] { color: var(--color-text-primary); }
.nav-link:hover::after, .nav-link[aria-current]::after, .has-mega[data-open="true"] .nav-link::after { transform: scaleX(1); }
.has-mega[data-open="true"] .nav-link { color: var(--color-text-primary); }
.has-mega[data-open="true"] .caret { transform: rotate(180deg); opacity: 1; }
@media (prefers-reduced-motion: reduce) { .nav-link::after { transition: none; } }

.nav-tools { grid-column: 3; justify-self: end; display: flex; align-items: center; gap: .65rem; }

.lang-toggle {
  display: inline-flex; border: 1px solid var(--color-border); border-radius: 999px;
  overflow: hidden; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .06em;
}
.lang-toggle a, .lang-toggle button {
  appearance: none; background: none; border: 0; cursor: pointer;
  padding: .35rem .6rem; color: var(--color-text-secondary); font: inherit; line-height: 1;
}
.lang-toggle [aria-current="true"] { background: var(--color-text-primary); color: var(--color-background); }

.icon-btn {
  appearance: none; cursor: pointer; width: 38px; height: 38px; display: inline-grid; place-items: center;
  border: 1px solid var(--color-border); border-radius: 999px;
  background: var(--color-surface); color: var(--color-text-primary);
  transition: border-color .2s ease, background-color .2s ease;
}
.icon-btn:hover { border-color: var(--color-text-secondary); }
.icon-btn svg { width: 17px; height: 17px; }
.theme-toggle .moon { display: none; }
:root[data-theme='dark'] .theme-toggle .sun { display: none; }
:root[data-theme='dark'] .theme-toggle .moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .sun { display: none; }
  :root:not([data-theme]) .theme-toggle .moon { display: block; }
}

.nav-cta { display: inline-flex; }
.menu-btn { display: none; }

/* ---- Mega menu (desktop) — full-width panel dropping from the header edge ----
   Kept as a descendant of its <li> so hover/focus chaining works; open/close is
   JS-driven via [data-open] for a hover-close delay, single-open behaviour,
   Escape, and outside-click (site-chrome.js). --------------------------------- */
.mega {
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: var(--color-surface-elevated);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-elevated);
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateY(-8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
  z-index: 90;
}
.has-mega[data-open="true"] .mega { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .mega { transition: opacity .2s ease, visibility .2s; transform: none; } }

.mega-inner { max-width: var(--maxw); margin-inline: auto; padding: 1.75rem var(--gutter) 2rem; }
.mega-head { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding-bottom: 1.25rem; margin-bottom: 1.25rem; border-bottom: 1px solid var(--color-border); }
.mega-title { font-family: var(--font-display); font-weight: 500; font-size: 1.5rem; line-height: 1.15; letter-spacing: -0.01em; color: var(--color-text-primary); margin: 0; }
.mega-intro { margin: .5rem 0 0; color: var(--color-text-secondary); font-size: .95rem; line-height: 1.5; max-width: 54ch; }
.mega-hub { flex: none; display: inline-flex; align-items: center; gap: .45rem; font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-text-secondary); white-space: nowrap; }
.mega-hub .arr { transition: transform .2s ease; }
.mega-hub:hover { color: var(--color-accent); }
.mega-hub:hover .arr { transform: translateX(3px); }

.mega-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: .4rem; }
.mega-grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .mega-grid--4 { grid-template-columns: repeat(2, 1fr); } }
.mega-grid > li { margin: 0; }
.mega-grid a { display: grid; grid-template-columns: auto 1fr; gap: .85rem; align-items: start; padding: .85rem; border-radius: var(--radius); transition: background-color .18s ease; }
.mega-grid a:hover { background: var(--color-surface); }
.mega-ic { width: 40px; height: 40px; flex: none; display: grid; place-items: center; border: 1px solid var(--color-border); border-radius: calc(var(--radius) * 1.5); color: var(--color-text-secondary); transition: color .18s ease, border-color .18s ease; }
.mega-ic svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.mega-grid a:hover .mega-ic { color: var(--color-accent); border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-border)); }
.mega-t { display: block; font-family: var(--font-body); font-weight: 600; font-size: .92rem; line-height: 1.3; color: var(--color-text-primary); }
.mega-d { display: block; margin-top: .28rem; font-size: .81rem; line-height: 1.45; color: var(--color-text-secondary); }

/* ---- Mobile menu + accordions ----------------------------------------------
   NOTE: .m-sub sets display:grid, which overrides the UA [hidden]{display:none}
   rule (author specificity wins) — so the collapsed state MUST be re-asserted
   with .m-sub[hidden]{display:none}, otherwise the accordion never closes. ---- */
.mobile-menu { display: none; border-top: 1px solid var(--color-border); background: var(--color-background); }
.mobile-menu.open { display: block; }
.m-nav { list-style: none; margin: 0; padding: .35rem 0; display: grid; gap: 0; }
.m-item { border-bottom: 1px solid var(--color-border); }
.m-item:last-child { border-bottom: 0; }
.m-row { display: flex; align-items: stretch; justify-content: space-between; }
.m-row > a { flex: 1 1 auto; display: block; padding: .9rem var(--gutter); color: var(--color-text-primary); font-weight: 500; }
.m-expand { flex: none; appearance: none; background: none; border: 0; border-left: 1px solid var(--color-border); cursor: pointer; padding: 0 calc(var(--gutter) - .35rem); color: var(--color-text-secondary); display: grid; place-items: center; }
.m-expand .chev { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform .25s ease; }
.m-expand[aria-expanded="true"] .chev { transform: rotate(180deg); }
.m-sub { list-style: none; margin: 0; padding: .1rem 0 .6rem; background: var(--color-surface); display: grid; gap: 0; }
.m-sub[hidden] { display: none; }
.m-sub a { display: block; padding: .6rem var(--gutter) .6rem calc(var(--gutter) + 1rem); color: var(--color-text-secondary); font-size: .92rem; }
.m-sub a:hover { color: var(--color-text-primary); }
.mobile-menu .lang-toggle { display: inline-flex; margin: .75rem var(--gutter) .25rem; }
.mobile-menu .m-cta { padding: 1rem var(--gutter) 1.25rem; }

@media (max-width: 960px) {
  .nav-links, .nav-cta, .nav-tools .lang-toggle { display: none; }
  .menu-btn { display: inline-grid; }
}

/* =============================================================================
   FOOTER
============================================================================= */
.site-footer { border-top: 1px solid var(--color-border); padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; }
.footer-top { display: grid; gap: clamp(2rem, 5vw, 3rem); }
.footer-brand { display: grid; gap: 1rem; max-width: 34ch; }
.footer-brand .brand { font-size: 1.15rem; }
.footer-brand p { margin: 0; color: var(--color-text-secondary); font-size: .9rem; }
.footer-cols { display: grid; gap: 2rem; }
.footer-col h4 {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--color-text-secondary); margin: 0 0 1rem;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .6rem; }
.footer-col a { color: var(--color-text-secondary); font-size: .92rem; }
.footer-col a:hover { color: var(--color-text-primary); }
.footer-bottom {
  margin-top: clamp(2.5rem, 5vw, 3.5rem); padding-top: 1.5rem; border-top: 1px solid var(--color-border);
  display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between;
}
.footer-bottom .endorse { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; color: var(--color-text-secondary); }
.footer-bottom .endorse b { color: var(--color-text-primary); font-weight: 500; }
.footer-tools { display: flex; align-items: center; gap: .65rem; }

/* ---- Responsive ---- */
@media (min-width: 720px) {
  .footer-top { grid-template-columns: minmax(0, 1.3fr) minmax(0, 2fr); }
  .footer-cols { grid-template-columns: repeat(3, 1fr); }
}