/* ============ İzBuz — Temel Stiller ============ */
:root {
  --mavi-koyu: #0b3a6e;
  --mavi: #1565c0;
  --mavi-acik: #4fa3e8;
  --buz: #e8f4fd;
  --buz-2: #f5faff;
  --beyaz: #ffffff;
  --metin: #1d2b3a;
  --metin-soluk: #5b6b7c;
  --cizgi: #d9e6f2;
  --golge: 0 10px 30px rgba(11, 58, 110, 0.08);
  --radius: 14px;
  --max: 1160px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--metin);
  background: var(--beyaz);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--mavi); text-decoration: none; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ============ Header ============ */
.header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--cizgi);
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.5rem; color: var(--mavi-koyu); letter-spacing: -0.5px; }
.logo span { color: var(--mavi-acik); }
.logo svg { width: 34px; height: 34px; }

.nav ul { display: flex; gap: 6px; list-style: none; align-items: center; }
.nav a {
  display: block; padding: 8px 14px; border-radius: 8px;
  color: var(--metin); font-weight: 500; font-size: 0.95rem; transition: 0.2s;
}
.nav a:hover { background: var(--buz); color: var(--mavi); }
.nav a.aktif { color: var(--mavi); background: var(--buz); }
.nav a.btn { color: var(--beyaz); background: var(--mavi); margin-left: 8px; }
.nav a.btn:hover { background: var(--mavi-koyu); }

.menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-btn span { display: block; width: 24px; height: 2px; background: var(--mavi-koyu); margin: 5px 0; transition: 0.3s; }

/* ============ Butonlar ============ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 10px; font-weight: 600; font-size: 1rem;
  background: var(--mavi); color: var(--beyaz); border: 2px solid var(--mavi);
  cursor: pointer; transition: 0.2s;
}
.btn:hover { background: var(--mavi-koyu); border-color: var(--mavi-koyu); transform: translateY(-2px); }
.btn-cizgi { background: transparent; color: var(--beyaz); border-color: rgba(255,255,255,0.7); }
.btn-cizgi:hover { background: var(--beyaz); color: var(--mavi-koyu); border-color: var(--beyaz); }
.btn-beyaz { background: var(--beyaz); color: var(--mavi-koyu); border-color: var(--beyaz); }
.btn-beyaz:hover { background: var(--buz); border-color: var(--buz); }

/* ============ Hero ============ */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--mavi-koyu) 0%, var(--mavi) 60%, var(--mavi-acik) 100%);
  color: var(--beyaz); padding: 110px 0 120px;
}
.hero::before, .hero::after {
  content: ""; position: absolute; border-radius: 50%;
  background: rgba(255, 255, 255, 0.07);
}
.hero::before { width: 520px; height: 520px; right: -140px; top: -160px; }
.hero::after { width: 320px; height: 320px; right: 220px; bottom: -180px; }
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.2fr 1fr; gap: 50px; align-items: center; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.15; letter-spacing: -1px; margin-bottom: 20px; }
.hero p { font-size: 1.15rem; opacity: 0.9; margin-bottom: 32px; max-width: 540px; }
.hero .butonlar { display: flex; gap: 14px; flex-wrap: wrap; }
.etiket {
  display: inline-block; padding: 6px 14px; border-radius: 30px; margin-bottom: 18px;
  background: rgba(255, 255, 255, 0.15); font-size: 0.85rem; font-weight: 600; letter-spacing: 0.5px;
}
.hero-gorsel { display: grid; place-items: center; }
.hero-gorsel img {
  width: min(100%, 440px); height: auto; border-radius: 50%;
  box-shadow: 0 0 0 10px rgba(255, 255, 255, 0.08), 0 30px 70px rgba(4, 20, 45, 0.45);
  animation: suzul 6s ease-in-out infinite;
}
@keyframes suzul { 50% { transform: translateY(-10px); } }
@media (prefers-reduced-motion: reduce) { .hero-gorsel img { animation: none; } }

.logo img { width: 48px; height: 48px; border-radius: 50%; flex-shrink: 0; }

/* Logodaki yazı stili: İZ- gümüş, BUZ buz mavisi, kalın italik */
.marka {
  font-family: "Exo 2", "Inter", system-ui, sans-serif; font-style: italic; font-weight: 900;
  font-size: 1.7rem; letter-spacing: 0.5px; line-height: 1; position: relative; padding-bottom: 6px;
  display: inline-flex;
}
.marka .iz, .marka .buz { -webkit-background-clip: text; background-clip: text; color: transparent; }
.marka .iz { background-image: linear-gradient(180deg, #8a99ab 0%, #3c4d61 55%, #6f8095 100%); padding-right: 2px; }
.marka .buz { background-image: linear-gradient(180deg, #6cc0ff 0%, #1e88e5 55%, #0d5bb5 100%); padding-right: 4px; }
.marka::after {
  content: ""; position: absolute; left: 0; right: 4px; bottom: 0; height: 3px; border-radius: 3px;
  background: linear-gradient(90deg, transparent, #1e88e5 25%, #6cc0ff 75%, transparent);
}
.footer .marka .iz { background-image: linear-gradient(180deg, #ffffff 0%, #c9d4df 55%, #f2f5f8 100%); }

/* Alt sayfa başlığı */
.sayfa-baslik {
  background: linear-gradient(135deg, var(--mavi-koyu), var(--mavi));
  color: var(--beyaz); padding: 70px 0; text-align: center;
}
.sayfa-baslik h1 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 8px; }
.sayfa-baslik p { opacity: 0.85; }
.sayfa-baslik .yol { font-size: 0.9rem; opacity: 0.75; margin-top: 10px; }
.sayfa-baslik .yol a { color: var(--beyaz); }

/* ============ Bölümler ============ */
section { padding: 90px 0; }
.bolum-acik { background: var(--buz-2); }
.bolum-baslik { text-align: center; max-width: 640px; margin: 0 auto 50px; }
.bolum-baslik .ust, .ust-yazi { color: var(--mavi); font-weight: 700; font-size: 0.85rem; letter-spacing: 1.5px; text-transform: uppercase; }
.bolum-baslik h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); color: var(--mavi-koyu); margin: 8px 0 12px; letter-spacing: -0.5px; }
.bolum-baslik p { color: var(--metin-soluk); }

/* İstatistik şeridi */
.istatistik { margin-top: -50px; position: relative; z-index: 2; padding: 0; }
.istatistik .kutu {
  background: var(--beyaz); border-radius: var(--radius); box-shadow: var(--golge);
  display: grid; grid-template-columns: repeat(4, 1fr); padding: 30px 10px;
}
.istatistik .oge { text-align: center; padding: 0 10px; border-right: 1px solid var(--cizgi); }
.istatistik .oge:last-child { border-right: none; }
.istatistik strong { display: block; font-size: 2rem; color: var(--mavi); }
.istatistik span { color: var(--metin-soluk); font-size: 0.92rem; }

/* Kartlar */
.grid { display: grid; gap: 26px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.kart {
  background: var(--beyaz); border: 1px solid var(--cizgi); border-radius: var(--radius);
  padding: 30px; transition: 0.25s;
}
.kart:hover { transform: translateY(-5px); box-shadow: var(--golge); border-color: transparent; }
.kart h3 { color: var(--mavi-koyu); margin: 16px 0 8px; font-size: 1.2rem; }
.kart p { color: var(--metin-soluk); font-size: 0.96rem; }
.ikon {
  width: 54px; height: 54px; border-radius: 12px; display: grid; place-items: center;
  background: var(--buz); color: var(--mavi);
}
.ikon svg { width: 28px; height: 28px; }

/* Ürün kartı */
.urun { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.urun .gorsel { aspect-ratio: 4/3; }
.urun .icerik { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.urun h3 { margin-top: 0; }
.urun ul { list-style: none; margin: 12px 0 18px; font-size: 0.9rem; color: var(--metin-soluk); }
.urun li { padding: 4px 0 4px 22px; position: relative; }
.urun li::before { content: "✓"; position: absolute; left: 0; color: var(--mavi); font-weight: 700; }
.urun .btn { margin-top: auto; justify-content: center; padding: 10px 18px; font-size: 0.92rem; }

/* Gerçek fotoğraflar */
.urun img.gorsel { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.ikili-foto { width: 100%; aspect-ratio: 5 / 4; object-fit: cover; border-radius: 20px; box-shadow: var(--golge); }

/* Görsel kaynakları (lisans gereği) */
.kaynaklar { margin-top: 10px; font-size: 0.78rem; opacity: 0.8; }
.kaynaklar summary { cursor: pointer; display: inline-block; }
.kaynaklar ul { list-style: none; margin-top: 8px; display: grid; gap: 4px; }
.kaynaklar a { text-decoration: underline; }

/* Yer tutucu görsel */
.yer-tutucu {
  background: linear-gradient(135deg, #dcecfb 0%, #f2f8fe 50%, #cfe4f8 100%);
  display: grid; place-items: center; color: var(--mavi-acik);
  font-size: 0.85rem; font-weight: 600; position: relative;
}
.yer-tutucu::after { content: attr(data-etiket); position: absolute; bottom: 12px; color: var(--metin-soluk); font-size: 0.78rem; font-weight: 500; }
.yer-tutucu svg { width: 56px; height: 56px; opacity: 0.6; }

/* İki sütun metin + görsel */
.ikili { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.ikili .yer-tutucu { aspect-ratio: 5/4; border-radius: 20px; }
.ikili h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); color: var(--mavi-koyu); margin: 8px 0 18px; letter-spacing: -0.5px; }
.ikili p { color: var(--metin-soluk); margin-bottom: 16px; }
.liste { list-style: none; margin: 20px 0 28px; }
.liste li { padding: 8px 0 8px 34px; position: relative; font-weight: 500; }
.liste li::before {
  content: "✓"; position: absolute; left: 0; top: 8px; width: 22px; height: 22px; border-radius: 50%;
  background: var(--buz); color: var(--mavi); font-size: 0.8rem; display: grid; place-items: center; font-weight: 700;
}

/* Sektörler */
.sektor { text-align: center; padding: 26px 16px; }
.sektor .ikon { margin: 0 auto; }
.sektor h3 { font-size: 1.02rem; margin: 14px 0 0; }

/* Görselsiz tek sütun metin bölümü */
.tek-sutun { max-width: 780px; text-align: center; }
.tek-sutun h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); color: var(--mavi-koyu); margin: 8px 0 18px; letter-spacing: -0.5px; text-wrap: balance; }
.tek-sutun p { color: var(--metin-soluk); margin-bottom: 16px; }

/* Kullanım alanı kartları (ana sayfa) */
.alan-kart { padding: 0; overflow: hidden; display: flex; flex-direction: column; color: inherit; }
.alan-kart img { width: 100%; aspect-ratio: 5 / 2; object-fit: cover; transition: transform 0.4s ease; }
.alan-kart:hover img { transform: scale(1.05); }
.alan-icerik { padding: 18px 20px 22px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.alan-icerik h3 { margin: 0; font-size: 1.08rem; }
.alan-icerik p { font-size: 0.9rem; }
.alan-icerik .daha { margin-top: auto; padding-top: 8px; color: var(--mavi); font-weight: 600; font-size: 0.88rem; }

/* Kullanım alanı blokları (hizmetler) */
.kullanim { display: grid; grid-template-columns: 1fr 1.5fr; gap: 50px; align-items: center; scroll-margin-top: 90px; }
.kullanim + .kullanim { margin-top: 80px; }
.kullanim.ters { grid-template-columns: 1.5fr 1fr; }
.kullanim.ters .kolaj { order: -1; }
.kullanim h2 { font-size: clamp(1.5rem, 3vw, 2rem); color: var(--mavi-koyu); margin: 8px 0 14px; letter-spacing: -0.5px; }
.kullanim p { color: var(--metin-soluk); margin-bottom: 14px; }
.etiketler { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 24px; list-style: none; }
.etiketler li { background: var(--buz); color: var(--mavi-koyu); font-size: 0.84rem; font-weight: 500; padding: 6px 12px; border-radius: 30px; }
.kolaj {
  display: block; border: 0; padding: 0; background: #071f3b; cursor: zoom-in;
  border-radius: 18px; overflow: hidden; box-shadow: var(--golge); max-width: 100%;
}
.kolaj img { width: 100%; height: auto; transition: transform 0.4s ease; }
.kolaj:hover img { transform: scale(1.02); }

/* Adımlar */
.adim { position: relative; }
.adim .no {
  font-size: 2.6rem; font-weight: 800; color: var(--buz); -webkit-text-stroke: 1.5px var(--mavi-acik);
  line-height: 1;
}

/* CTA */
.cta {
  background: linear-gradient(135deg, var(--mavi), var(--mavi-koyu));
  color: var(--beyaz); border-radius: 24px; padding: 60px; text-align: center;
}
.cta h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 10px; }
.cta p { opacity: 0.88; margin-bottom: 28px; }
.cta .butonlar { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* Değerler (hakkımızda) */
.zaman { border-left: 2px solid var(--cizgi); padding-left: 28px; }
.zaman .oge { position: relative; padding-bottom: 28px; }
.zaman .oge::before {
  content: ""; position: absolute; left: -36px; top: 6px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--mavi); border: 3px solid var(--buz);
}
.zaman strong { color: var(--mavi); }
.zaman h4 { color: var(--mavi-koyu); margin: 2px 0 4px; }
.zaman p { color: var(--metin-soluk); font-size: 0.95rem; }

/* ============ Galeri ============ */
.filtre { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 36px; }
.filtre button {
  padding: 9px 20px; border-radius: 30px; border: 1px solid var(--cizgi); background: var(--beyaz);
  cursor: pointer; font: inherit; font-size: 0.92rem; color: var(--metin); transition: 0.2s;
}
.filtre button:hover { border-color: var(--mavi-acik); color: var(--mavi); }
.filtre button.aktif { background: var(--mavi); border-color: var(--mavi); color: var(--beyaz); }

/* Görseller farklı oranlarda olduğu için sütunlu (masonry) yerleşim */
.galeri { columns: 3 280px; column-gap: 18px; }
.galeri .oge {
  display: block; width: 100%; margin: 0 0 18px; padding: 0; border: 0; background: #071f3b;
  break-inside: avoid; border-radius: var(--radius); overflow: hidden; cursor: zoom-in; transition: 0.25s;
}
.galeri .oge img { width: 100%; height: auto; }
.galeri .oge:hover { transform: translateY(-3px); box-shadow: var(--golge); }
.galeri .oge:focus-visible, .kolaj:focus-visible { outline: 3px solid var(--mavi-acik); outline-offset: 3px; }
.galeri .oge.gizli { display: none; }

.lightbox {
  position: fixed; inset: 0; background: rgba(6, 25, 48, 0.9); z-index: 200;
  display: none; align-items: center; justify-content: center; padding: 20px;
}
.lightbox.acik { display: flex; }
.lightbox .icerik { max-width: min(1100px, 100%); border-radius: 16px; overflow: hidden; }
.lightbox .icerik img { width: auto; max-width: 100%; max-height: 86vh; margin: 0 auto; }
.lightbox .kapat {
  position: absolute; top: 20px; right: 24px; background: none; border: none; color: #fff;
  font-size: 2.4rem; cursor: pointer; line-height: 1;
}

/* ============ İletişim ============ */
.bilgi-kart { display: flex; gap: 16px; align-items: flex-start; padding: 22px; }
.bilgi-kart h4 { color: var(--mavi-koyu); margin-bottom: 2px; }
.bilgi-kart p { color: var(--metin-soluk); font-size: 0.95rem; }

/* ============ Footer ============ */
.footer { background: #071f3b; color: #b7c8db; padding: 70px 0 0; font-size: 0.94rem; }
.footer .grid { grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; }
.footer .logo { color: var(--beyaz); margin-bottom: 14px; }
.footer h4 { color: var(--beyaz); margin-bottom: 16px; font-size: 1rem; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 9px; }
.footer a { color: #b7c8db; transition: 0.2s; }
.footer a:hover { color: var(--beyaz); }
.footer .alt { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 50px; padding: 22px 0; text-align: center; font-size: 0.85rem; }

/* WhatsApp butonu */
.whatsapp {
  position: fixed; right: 22px; bottom: 22px; z-index: 150;
  width: 58px; height: 58px; border-radius: 50%; background: #25d366;
  display: grid; place-items: center; box-shadow: 0 8px 24px rgba(0,0,0,0.2); transition: 0.2s;
}
.whatsapp:hover { transform: scale(1.08); }
.whatsapp svg { width: 30px; height: 30px; fill: #fff; }

/* Animasyon */
@media (prefers-reduced-motion: no-preference) {
  .gorun.goster { animation: yukari 0.6s ease both; }
}
@keyframes yukari { from { transform: translateY(16px); } to { transform: none; } }


/* ============ Responsive ============ */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero .container, .ikili, .kullanim, .kullanim.ters { grid-template-columns: 1fr; gap: 28px; }
  .kullanim.ters .kolaj { order: 0; }
  .hero-gorsel { order: -1; }
  .hero-gorsel img { width: min(70%, 260px); }
  .footer .grid { grid-template-columns: 1fr 1fr; }
  .galeri { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 820px) {
  .menu-btn { display: block; }
  .nav {
    position: absolute; top: 72px; left: 0; right: 0; background: var(--beyaz);
    border-bottom: 1px solid var(--cizgi); max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
  }
  .nav.acik { max-height: 420px; }
  .nav ul { flex-direction: column; align-items: stretch; padding: 12px 20px 20px; gap: 4px; }
  .nav a.btn { margin: 8px 0 0; justify-content: center; }
  .menu-btn.acik span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-btn.acik span:nth-child(2) { opacity: 0; }
  .menu-btn.acik span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 640px) {
  section { padding: 64px 0; }
  .hero { padding: 80px 0 100px; }
  .grid-3, .grid-4, .grid-2, .galeri { grid-template-columns: 1fr; }
  .istatistik .kutu { grid-template-columns: 1fr 1fr; gap: 20px 0; }
  .istatistik .oge:nth-child(2) { border-right: none; }
  .footer .grid { grid-template-columns: 1fr; }
  .cta { padding: 40px 24px; }
}