/* ============================================================
   SAE Mühendislik ve Danışmanlık — site stili
   Palet: çelik laciverti + ergimiş metal turuncusu
   ============================================================ */

:root {
  --navy-900: #0b1220;
  --navy-800: #101b30;
  --navy-700: #16233d;
  --navy-100: #dbe4f0;
  --steel: #33507a;
  --molten: #f97316;
  --molten-dark: #d95f0a;
  --ink: #16202e;
  --ink-soft: #4b5a6e;
  --paper: #f6f8fb;
  --card: #ffffff;
  --line: #e3e9f1;
  --radius: 14px;
  --shadow: 0 2px 6px rgba(11, 18, 32, .06), 0 12px 32px -12px rgba(11, 18, 32, .18);
  --font-head: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--molten-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; color: var(--ink); }

/* ---------- Üst bar + menü ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--navy-900);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 9px;
  background: linear-gradient(135deg, var(--molten), #c2410c);
  display: grid; place-items: center;
  font-family: var(--font-head); font-weight: 700; font-size: 15px; color: #fff;
  letter-spacing: .5px;
}
.brand-name { display: flex; flex-direction: column; }
.brand-name strong {
  font-family: var(--font-head); color: #fff; font-size: 16px; letter-spacing: .06em;
}
.brand-name span { color: #8fa3bd; font-size: 11px; letter-spacing: .04em; }

.main-nav ul { display: flex; gap: 4px; list-style: none; }
.main-nav a {
  display: block; padding: 8px 14px; border-radius: 8px;
  color: #c8d4e4; font-size: 14px; font-weight: 500; letter-spacing: .02em;
}
.main-nav a:hover { color: #fff; background: rgba(255, 255, 255, .07); text-decoration: none; }
.main-nav a.active { color: #fff; background: rgba(249, 115, 22, .18); }
.main-nav a.active:hover { background: rgba(249, 115, 22, .28); }
.main-nav a.lang-switch {
  border: 1px solid rgba(255,255,255,.35); border-radius: 999px;
  padding: 6px 14px; margin-left: 10px; font-weight: 700; letter-spacing: .08em;
  color: #fdba74;
}
.main-nav a.lang-switch:hover { background: rgba(249,115,22,.2); color: #fff; }

.nav-toggle {
  display: none; background: none; border: 1px solid rgba(255,255,255,.2);
  border-radius: 8px; padding: 8px 10px; cursor: pointer; color: #fff;
}
.nav-toggle svg { display: block; }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff;
  background: var(--navy-900);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: .45;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(11,18,32,.94) 25%, rgba(11,18,32,.55) 65%, rgba(217,95,10,.25));
}
.hero .container { position: relative; padding: 96px 24px 104px; }
.hero-kicker {
  display: inline-block; margin-bottom: 18px; padding: 6px 14px;
  border: 1px solid rgba(249,115,22,.5); border-radius: 999px;
  color: #fdba74; font-size: 13px; font-weight: 600; letter-spacing: .12em;
}
.hero h1 { color: #fff; font-size: clamp(30px, 5vw, 52px); max-width: 17ch; }
.hero p.lead {
  margin-top: 18px; max-width: 56ch; color: #c8d4e4; font-size: clamp(15px, 2vw, 18px);
}
.hero-actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 13px 26px; border-radius: 10px;
  font-weight: 600; font-size: 15px; letter-spacing: .02em;
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--molten); color: #fff; box-shadow: 0 8px 24px -8px rgba(249,115,22,.7); }
.btn-primary:hover { background: var(--molten-dark); }
.btn-ghost { border: 1px solid rgba(255,255,255,.35); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.08); }

/* ---------- Bölümler ---------- */
.section { padding: 72px 0; }
.section.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head .eyebrow {
  color: var(--molten-dark); font-weight: 700; font-size: 13px;
  letter-spacing: .14em; text-transform: uppercase;
}
.section-head h2 { font-size: clamp(24px, 3.4vw, 34px); margin-top: 8px; }
.section-head p { margin-top: 12px; color: var(--ink-soft); }

/* Kart ızgaraları */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .18s, box-shadow .18s;
  display: flex; flex-direction: column;
}
a.card { color: inherit; }
a.card:hover { text-decoration: none; transform: translateY(-4px); box-shadow: 0 4px 10px rgba(11,18,32,.08), 0 20px 44px -14px rgba(11,18,32,.28); }
.card-img { aspect-ratio: 16 / 10; overflow: hidden; background: var(--navy-100); }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
a.card:hover .card-img img { transform: scale(1.05); }
.card-body { padding: 18px 20px 22px; flex: 1; }
.card-body h3 { font-size: 17px; }
.card-body p { margin-top: 8px; color: var(--ink-soft); font-size: 14px; }
.card-more { margin-top: 12px; color: var(--molten-dark); font-weight: 600; font-size: 14px; }

/* Sektör kartları (koyu, görsel ağırlıklı) */
.sector { position: relative; border-radius: var(--radius); overflow: hidden; aspect-ratio: 4 / 5; }
.sector img { width: 100%; height: 100%; object-fit: cover; }
.sector figcaption {
  position: absolute; inset: auto 0 0 0; padding: 40px 18px 16px;
  background: linear-gradient(transparent, rgba(11,18,32,.92));
  color: #fff; font-family: var(--font-head); font-weight: 600; font-size: 16px;
  letter-spacing: .04em;
}

/* Hakkında şeridi */
.about-band { background: var(--navy-900); color: #c8d4e4; }
.about-band .section-head .eyebrow { color: var(--molten); }
.about-band h2 { color: #fff; }
.about-band p { color: #b3c2d6; }
.about-cols { display: grid; grid-template-columns: 1.2fr .8fr; gap: 48px; align-items: start; }
.discipline-list { list-style: none; display: grid; gap: 10px; }
.discipline-list li {
  padding: 12px 16px; border: 1px solid rgba(255,255,255,.12); border-radius: 10px;
  background: rgba(255,255,255,.04); font-size: 15px; color: #dbe4f0;
}
.discipline-list li::before { content: "▸ "; color: var(--molten); font-weight: 700; }

/* İçerik sayfaları */
.page-hero {
  background: var(--navy-900); color: #fff; padding: 56px 0;
  border-bottom: 4px solid var(--molten);
}
.page-hero h1 { color: #fff; font-size: clamp(26px, 4vw, 40px); }
.page-hero p { margin-top: 10px; color: #a8b8cd; max-width: 62ch; }

.prose { max-width: 760px; }
.prose h2 { font-size: 24px; margin: 36px 0 12px; }
.prose h3 { font-size: 19px; margin: 28px 0 10px; }
.prose p { margin: 14px 0; color: #2c3a4c; }
.prose ul { margin: 14px 0 14px 22px; color: #2c3a4c; }
.prose li { margin: 6px 0; }
.prose .figure { margin: 28px 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }

/* PDF indirme kutusu */
.download {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 18px; margin: 12px 0;
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--molten);
  border-radius: 10px; box-shadow: var(--shadow);
  color: inherit; font-weight: 600;
}
.download:hover { text-decoration: none; transform: translateY(-2px); }
.download .ext { color: var(--ink-soft); font-weight: 400; font-size: 13px; }
.download svg { flex-shrink: 0; color: var(--molten-dark); }

/* Kaynak listesi */
.resource {
  display: block; padding: 20px 22px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); color: inherit;
  transition: transform .15s;
}
.resource:hover { text-decoration: none; transform: translateY(-3px); }
.resource h3 { font-size: 16px; color: var(--ink); }
.resource p { margin-top: 6px; font-size: 14px; color: var(--ink-soft); }
.resource .url { margin-top: 10px; font-size: 13px; color: var(--molten-dark); font-weight: 600; word-break: break-all; }

/* İletişim */
.contact-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 32px; max-width: 560px;
}
.contact-row { display: flex; align-items: center; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.contact-row:last-child { border-bottom: none; }
.contact-row svg { color: var(--molten-dark); flex-shrink: 0; }
.contact-row .label { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); }
.contact-row .value { font-weight: 600; font-size: 16px; }

/* ---------- Alt bilgi ---------- */
.site-footer { background: var(--navy-900); color: #8fa3bd; padding: 56px 0 28px; margin-top: 72px; }
.section + .site-footer, .section.alt + .site-footer { margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.site-footer h4 { color: #fff; font-size: 15px; letter-spacing: .06em; margin-bottom: 14px; }
.site-footer ul { list-style: none; }
.site-footer li { margin: 8px 0; }
.site-footer a { color: #a8b8cd; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.footer-about { font-size: 14px; max-width: 40ch; }
.footer-bottom {
  margin-top: 44px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 13px; color: #6b7f99;
}

/* ---------- Duyarlılık ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .about-cols { grid-template-columns: 1fr; gap: 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--navy-800); border-bottom: 1px solid rgba(255,255,255,.1);
    padding: 10px 16px 16px;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav a { padding: 12px 14px; font-size: 16px; }
  .hero .container { padding: 64px 24px 72px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .sector { aspect-ratio: 16 / 10; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
}