/* ilbir.net — çatı sitesi. Kimlik: kurt başı logosu (koyu lacivert, mavi→yeşil neon). TR/EN (html[data-lang]). */
:root {
  --bg: #060c17;
  --bg-2: #0a1424;
  --card: #0d1a2d;
  --ink: #eaf4ff;
  --ink-2: #a8bcd3;
  --muted: #6c839f;
  --line: #182a44;
  --accent: #10f2a8;
  --accent-2: #0aa6f5;
  --mid: #09d3e6;
  --grad: linear-gradient(100deg, #0aa6f5, #09d3e6 45%, #10f2a8);
  --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 18px 44px -18px rgba(0, 0, 0, .7);
  --radius: 20px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html:focus-within { scroll-behavior: smooth; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }

/* Dil seçimi: iki dil de sayfada, biri gizli. */
html[data-lang="tr"] [lang="en"]:not(html), html[data-lang="en"] [lang="tr"]:not(html) { display: none !important; }

/* Üst çubuk */
.top { position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(1.4) blur(14px); background: color-mix(in srgb, var(--bg) 82%, transparent); border-bottom: 1px solid transparent; transition: border-color .2s; }
.top.scrolled { border-bottom-color: var(--line); }
.top .wrap { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 600 19px/1 Bahnschrift, "DIN Alternate", "Segoe UI", sans-serif; letter-spacing: .12em; }
.brand img { width: 40px; height: 40px; filter: drop-shadow(0 0 8px rgba(9, 211, 230, .35)); }
.nav { display: flex; gap: 22px; margin-inline-start: auto; }
.nav a { text-decoration: none; color: var(--ink-2); font-size: 15px; }
.nav a:hover { color: var(--ink); }
.lang { border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: 6px 12px; font: 600 13px/1 inherit; cursor: pointer; }
.lang:hover { border-color: var(--ink-2); }

/* Giriş */
.hero { padding: 96px 0 72px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -30% -12% auto auto; width: 820px; height: 820px; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(9, 211, 230, .16), transparent);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: radial-gradient(rgba(120, 200, 255, .12) 1px, transparent 1px); background-size: 28px 28px;
  -webkit-mask: radial-gradient(70% 80% at 75% 40%, #000, transparent); mask: radial-gradient(70% 80% at 75% 40%, #000, transparent);
}
.hero .wrap { position: relative; z-index: 1; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--mid); }
.eyebrow::before { content: ""; width: 18px; height: 2px; background: currentColor; border-radius: 2px; }
.hero h1 { font-size: clamp(40px, 6.4vw, 76px); line-height: 1.02; letter-spacing: -.035em; margin: 18px 0 22px; max-width: 14ch; }
.hero h1 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { font-size: clamp(17px, 2vw, 20px); color: var(--ink-2); max-width: 56ch; margin: 0 0 32px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 22px; border-radius: 999px; font-weight: 600; text-decoration: none; border: 1px solid transparent; transition: transform .15s, background .15s; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--grad); color: #04121a; box-shadow: 0 8px 28px -10px rgba(9, 211, 230, .6); }
.btn.ghost { border-color: var(--line); background: var(--card); }

/* Giriş görseli: parlayan kurt başı */
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.art { position: relative; display: grid; place-items: center; }
.art::before { content: ""; position: absolute; width: 78%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(closest-side, rgba(9, 211, 230, .28), rgba(16, 242, 168, .08) 60%, transparent); filter: blur(10px); }
.art img { position: relative; width: min(420px, 100%); height: auto; filter: drop-shadow(0 0 22px rgba(9, 211, 230, .45)); animation: glow 5s ease-in-out infinite; }
.art .word { position: relative; margin-top: 8px; font: 600 clamp(28px, 3.4vw, 44px)/1 Bahnschrift, "DIN Alternate", "Segoe UI", sans-serif; letter-spacing: .22em; padding-inline-start: .22em; background: linear-gradient(180deg, #ffffff, #bfe6ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
@keyframes glow { 50% { filter: drop-shadow(0 0 34px rgba(16, 242, 168, .55)); } }

/* Bölümler */
section { padding: 72px 0; }
.head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 36px; }
.head h2 { font-size: clamp(30px, 4vw, 44px); letter-spacing: -.03em; line-height: 1.1; margin: 8px 0 0; }
.head p { color: var(--ink-2); margin: 0; max-width: 44ch; }

/* Ürün kartları */
.products { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.product {
  position: relative; display: flex; flex-direction: column; gap: 18px; padding: 32px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); text-decoration: none; overflow: hidden;
  transition: transform .2s, border-color .2s;
}
.product:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--tone) 50%, var(--line)); }
.product::after {
  content: ""; position: absolute; inset: auto -30% -55% auto; width: 360px; height: 360px; border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--tone) 18%, transparent), transparent); pointer-events: none;
}
.product.kervan { --tone: #2fbf5c; }
.product.netice { --tone: #8f7bff; }
.product header { display: flex; align-items: center; gap: 16px; }
.product header img { width: 64px; height: 64px; border-radius: 16px; }
.product h3 { font-size: 28px; letter-spacing: -.02em; margin: 0; }
.product .kind { color: var(--muted); font-size: 14px; }
.product p { color: var(--ink-2); margin: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 13px; padding: 4px 10px; border-radius: 999px; background: var(--bg-2); color: var(--ink-2); border: 1px solid var(--line); }
.product .go { margin-top: auto; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--tone); }
.product .go span { transition: transform .2s; }
.product:hover .go span { transform: translateX(4px); }
.product ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.product li { display: flex; gap: 10px; color: var(--ink-2); font-size: 15px; }
.product li::before { content: ""; flex: none; width: 6px; height: 6px; margin-top: 9px; border-radius: 50%; background: var(--tone); }

/* İlkeler */
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.principle { padding: 26px; border-radius: var(--radius); background: var(--bg-2); border: 1px solid var(--line); }
.principle .num { font: 700 13px/1 ui-monospace, "Cascadia Mono", Consolas, monospace; color: var(--mid); }
.principle h3 { margin: 12px 0 8px; font-size: 20px; letter-spacing: -.01em; }
.principle p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* Alt bilgi */
footer { border-top: 1px solid var(--line); padding: 32px 0 48px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
footer nav { display: flex; gap: 18px; }
footer a { text-decoration: none; }
footer a:hover { color: var(--ink); }

/* Metin sayfaları (gizlilik) */
.doc { padding: 56px 0 80px; }
.doc .wrap { max-width: 760px; }
.doc h1 { font-size: clamp(32px, 5vw, 48px); letter-spacing: -.03em; margin: 0 0 8px; }
.doc .updated { color: var(--muted); margin: 0 0 40px; }
.doc h2 { font-size: 22px; margin: 36px 0 10px; letter-spacing: -.01em; }
.doc p, .doc li { color: var(--ink-2); }

@media (max-width: 860px) {
  .products, .principles, .hero-grid { grid-template-columns: 1fr; }
  .art { order: -1; justify-self: start; }
  .art img { width: 168px; }
  .art .word { display: none; }
  .art::before { width: 200px; }
  .nav { display: none; }
  .lang { margin-inline-start: auto; }
  .hero { padding: 64px 0 48px; }
  section { padding: 56px 0; }
  .product { padding: 24px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }