/* =========================================================
   İSTEKKD — Base: reset, tipografi, düzen, temel UI öğeleri
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--hdr-stick) + 16px); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-16);
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body.is-locked { overflow: hidden; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--r-xs); }
.on-dark :focus-visible, .dark :focus-visible { box-shadow: 0 0 0 2px var(--ink), 0 0 0 4px var(--orange); }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 999;
  background: var(--orange); color: var(--ink); font-weight: 700;
  padding: 10px 16px; border-radius: var(--r-sm);
  transition: top var(--t-fast);
}
.skip-link:focus { top: 12px; }

.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- Tipografi ---------- */
.display, .h1, .h2, .h3 {
  font-stretch: var(--display-stretch);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.02;
  text-wrap: balance;
}
.h1 { font-size: var(--fs-61); }
.h2 { font-size: var(--fs-39); }
.h3 { font-size: var(--fs-24); line-height: 1.15; }
.lead { font-size: var(--fs-18); line-height: 1.6; color: var(--slate); max-width: 60ch; }
.dark .lead { color: var(--mist); }
.muted { color: var(--slate); }
.code {
  font-family: var(--mono);
  font-size: .82em;
  letter-spacing: 0;
  font-weight: 500;
}

/* ---------- Düzen ---------- */
.container { width: min(100% - 2 * var(--gutter), var(--container)); margin-inline: auto; }
.section { padding-block: var(--section); }
.section-head {
  display: flex; align-items: end; justify-content: space-between; gap: var(--s6);
  margin-bottom: var(--s8);
}
.section-head p { margin-top: var(--s3); }
.dark { background: var(--ink); color: var(--white); }
.stack > * + * { margin-top: var(--s4); }

/* Blueprint ızgarası — sadece teknik bölümlerde */
.blueprint {
  background-image:
    linear-gradient(rgb(255 255 255 / .045) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / .045) 1px, transparent 1px),
    linear-gradient(rgb(255 255 255 / .02) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / .02) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px, 24px 24px, 24px 24px;
  background-position: -1px -1px;
}
.grain::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .06; mix-blend-mode: overlay;
  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%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.icon--sm { width: 16px; height: 16px; }
.icon--lg { width: 26px; height: 26px; }

/* ---------- Butonlar ---------- */
.btn {
  --btn-bg: transparent; --btn-fg: var(--ink); --btn-bd: var(--rule);
  position: relative; isolation: isolate; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s2);
  min-height: 48px; padding: 0 var(--s6);
  border-radius: var(--r-sm);
  border: 1px solid var(--btn-bd);
  background: var(--btn-bg); color: var(--btn-fg);
  font-weight: 700; font-size: var(--fs-16); letter-spacing: .005em; white-space: nowrap;
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-mid) var(--ease-out),
              background-color var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  will-change: transform;
}
.btn:active { transform: scale(.98); }
.btn[disabled] { opacity: .5; pointer-events: none; }

/* Işık süpürmesi */
.btn::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: linear-gradient(105deg, transparent 30%, rgb(255 255 255 / .55) 50%, transparent 70%);
  transform: translateX(-120%);
}
.btn:hover::after { transform: translateX(120%); transition: transform 700ms var(--ease-out); }

.btn--primary {
  --btn-bg: var(--orange); --btn-fg: var(--ink); --btn-bd: transparent;
  clip-path: polygon(var(--chamfer) 0, 100% 0, 100% calc(100% - var(--chamfer)), calc(100% - var(--chamfer)) 100%, 0 100%, 0 var(--chamfer));
  border-radius: 0;
}
.btn--primary:hover { --btn-bg: var(--orange-hi); }
.btn--primary.btn--glow { filter: drop-shadow(0 8px 20px rgb(var(--orange-glow) / .45)); }

.btn--dark { --btn-bg: var(--ink); --btn-fg: var(--white); --btn-bd: var(--ink); }
.btn--dark:hover { --btn-bg: var(--iron); }
.btn--outline:hover { --btn-bd: var(--ink); }
.btn--ghost-dark { --btn-fg: var(--white); --btn-bd: rgb(255 255 255 / .22); --btn-bg: rgb(255 255 255 / .04); backdrop-filter: blur(8px); }
.btn--ghost-dark:hover { --btn-bd: rgb(255 255 255 / .6); }
.btn--ghost-dark::after { background: linear-gradient(105deg, transparent 30%, rgb(var(--orange-glow) / .25) 50%, transparent 70%); }
.btn--lg { min-height: 56px; padding: 0 var(--s8); font-size: var(--fs-18); }
.btn--sm { min-height: 38px; padding: 0 var(--s4); font-size: var(--fs-14); }
.btn--block { width: 100%; }

.icon-btn {
  position: relative; display: inline-grid; place-items: center;
  width: 44px; height: 44px; border-radius: var(--r-sm);
  transition: background-color var(--t-fast), color var(--t-fast);
}
.icon-btn:hover { background: rgb(21 24 28 / .06); }
.on-dark .icon-btn:hover { background: rgb(255 255 255 / .08); }
.icon-btn .count, .bottom-nav .count {
  position: absolute; top: 4px; right: 2px; min-width: 18px; height: 18px; padding: 0 5px;
  border-radius: var(--r-pill); background: var(--orange); color: var(--ink);
  font-size: 11px; font-weight: 800; line-height: 18px; text-align: center;
  transform: scale(0); transition: transform var(--t-mid) var(--ease-out);
}
.icon-btn .count.has, .bottom-nav .count.has { transform: scale(1); }
.icon-btn .count.bump, .bottom-nav .count.bump { animation: bump 420ms var(--ease-out); }
@keyframes bump { 0% { transform: scale(1); } 35% { transform: scale(1.45); } 100% { transform: scale(1); } }

.link-arrow {
  display: inline-flex; align-items: center; gap: var(--s2);
  font-weight: 700; border-bottom: 2px solid transparent; padding-bottom: 2px;
  transition: border-color var(--t-fast), gap var(--t-mid) var(--ease-out);
}
.link-arrow:hover { border-color: var(--orange); gap: var(--s3); }

/* ---------- Form ---------- */
.field { position: relative; }
.field input, .field textarea, .field select {
  width: 100%; min-height: 54px; padding: 22px 14px 8px;
  border: 1px solid var(--rule); border-radius: var(--r-xs); background: var(--white);
  transition: border-color var(--t-fast), box-shadow var(--t-mid);
}
.field label {
  position: absolute; left: 15px; top: 17px; color: var(--slate); pointer-events: none;
  transform-origin: left top; transition: transform var(--t-mid) var(--ease-out), color var(--t-fast);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--orange); box-shadow: 0 0 0 4px rgb(var(--orange-glow) / .16); }
.field input:focus + label, .field input:not(:placeholder-shown) + label { transform: translateY(-10px) scale(.78); color: var(--orange-deep); }
.dark .field input { background: rgb(255 255 255 / .05); border-color: rgb(255 255 255 / .16); color: var(--white); }
.dark .field label { color: var(--mist); }
.dark .field input:focus + label, .dark .field input:not(:placeholder-shown) + label { color: var(--orange); }

.check { display: flex; align-items: center; gap: var(--s3); cursor: pointer; min-height: 32px; font-size: var(--fs-14); }
.check input { appearance: none; width: 18px; height: 18px; flex: none; margin: 0; border: 1.5px solid #B8BEC4; border-radius: 3px; display: grid; place-items: center; transition: background-color var(--t-fast), border-color var(--t-fast); }
.check input::after { content: ""; width: 9px; height: 5px; border: 2px solid var(--ink); border-top: 0; border-right: 0; transform: rotate(-45deg) scale(0) translate(1px, -1px); transition: transform var(--t-fast) var(--ease-out); }
.check input:checked { background: var(--orange); border-color: var(--orange); }
.check input:checked::after { transform: rotate(-45deg) scale(1) translate(1px, -1px); }
.check .n { margin-left: auto; color: var(--slate); font-size: var(--fs-12); }

/* ---------- Rozetler ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 4px; height: 24px; padding: 0 8px;
  font-size: var(--fs-12); font-weight: 700; border-radius: var(--r-xs); white-space: nowrap;
}
.badge--sale { background: var(--orange); color: var(--ink); clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px); border-radius: 0; }
.badge--new { background: var(--ink); color: var(--white); }
.badge--std { background: var(--white); color: var(--ink); border: 1px solid var(--rule); font-family: var(--mono); font-weight: 500; font-size: 11px; }
.dark .badge--std { background: transparent; color: var(--mist); border-color: rgb(255 255 255 / .18); }

.chip {
  display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 14px;
  border: 1px solid var(--rule); border-radius: var(--r-pill); background: var(--white);
  font-size: var(--fs-14); font-weight: 600; transition: border-color var(--t-fast), background-color var(--t-fast);
}
.chip:hover, .chip[aria-pressed="true"] { border-color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--white); }

.stock { display: inline-flex; align-items: center; gap: 6px; font-size: var(--fs-13); font-weight: 600; }
.stock::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 3px color-mix(in srgb, currentColor 18%, transparent); }
.stock--in { color: var(--ok); }
.stock--low { color: var(--warn); }
.stock--out { color: var(--slate); }

.stars { display: inline-flex; align-items: center; gap: 1px; color: var(--orange); }
.stars svg { width: 14px; height: 14px; fill: currentColor; stroke: none; }
.stars .off { color: #CDD2D6; }

/* ---------- Scroll reveal (tek, ölçülü) ---------- */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity var(--t-slow) var(--ease-out), transform var(--t-slow) var(--ease-out); transition-delay: var(--d, 0ms); }
[data-reveal].in { opacity: 1; transform: none; }
.no-js [data-reveal] { opacity: 1; transform: none; }

/* ---------- Skeleton ---------- */
.skel { position: relative; overflow: hidden; background: #E3E6E8; border-radius: var(--r-xs); }
.skel::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, rgb(255 255 255 / .6), transparent); animation: shimmer 1.3s infinite; }
@keyframes shimmer { to { transform: translateX(100%); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; scroll-behavior: auto !important; }
  [data-reveal] { opacity: 1; transform: none; }
}