/* ===================================================================
   BMSTURK — Batarya Yönetim Sistemleri Bilgi Sitesi
   Ana stil dosyası
   =================================================================== */

:root {
  --renk-birincil: #0a7d5a;
  --renk-birincil-koyu: #075c42;
  --renk-ikincil: #f5b700;
  --renk-vurgu: #1fb6a0;
  --renk-metin: #1c2b28;
  --renk-metin-acik: #5a6b67;
  --renk-arka: #ffffff;
  --renk-arka-yumusak: #f4f8f6;
  --renk-kenar: #e2ece8;
  --golge: 0 4px 20px rgba(10, 125, 90, 0.08);
  --golge-buyuk: 0 12px 40px rgba(10, 125, 90, 0.12);
  --radius: 14px;
  --gecis: 0.25s ease;
  --max-genislik: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--renk-metin);
  background: var(--renk-arka);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--renk-birincil);
  text-decoration: none;
  transition: color var(--gecis);
}

a:hover {
  color: var(--renk-birincil-koyu);
}

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

.kapsayici {
  width: 100%;
  max-width: var(--max-genislik);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Üst Menü ---------- */
.ust-menu {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--renk-kenar);
}

.ust-menu-ic {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--renk-metin);
  letter-spacing: -0.5px;
}

.logo:hover {
  color: var(--renk-metin);
}

.logo-isaret {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--renk-birincil), var(--renk-vurgu));
  border-radius: 10px;
  color: #fff;
  font-size: 1.1rem;
}

.logo span {
  color: var(--renk-birincil);
}

.menu-linkler {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
}

.menu-linkler a {
  display: block;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  color: var(--renk-metin-acik);
  font-weight: 600;
  font-size: 0.95rem;
}

.menu-linkler a:hover,
.menu-linkler a.aktif {
  color: var(--renk-birincil);
  background: var(--renk-arka-yumusak);
}

.menu-buton {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  flex-direction: column;
  gap: 5px;
}

.menu-buton span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--renk-metin);
  border-radius: 2px;
  transition: var(--gecis);
}

/* ---------- Sağ menü grubu + Dil seçici ---------- */
.menu-sag {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.dil-secici {
  position: relative;
}

.dil-secici summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--renk-kenar);
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--renk-metin);
  background: #fff;
  transition: var(--gecis);
}

.dil-secici summary::-webkit-details-marker {
  display: none;
}

.dil-secici summary::marker {
  content: "";
}

.dil-secici summary:hover,
.dil-secici[open] summary {
  border-color: var(--renk-birincil);
  color: var(--renk-birincil);
}

.dil-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background: #fff;
  border: 1px solid var(--renk-kenar);
  border-radius: 10px;
  box-shadow: var(--golge);
  list-style: none;
  min-width: 150px;
  overflow: hidden;
  z-index: 200;
}

.dil-menu li a {
  display: block;
  padding: 0.65rem 1rem;
  color: var(--renk-metin-acik);
  font-weight: 600;
  font-size: 0.92rem;
}

.dil-menu li a:hover {
  background: var(--renk-arka-yumusak);
  color: var(--renk-birincil);
}

.dil-menu li a.aktif {
  color: var(--renk-birincil);
  background: var(--renk-arka-yumusak);
}

/* ---------- Butonlar ---------- */
.buton {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--gecis);
}

.buton-birincil {
  background: var(--renk-birincil);
  color: #fff;
}

.buton-birincil:hover {
  background: var(--renk-birincil-koyu);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--golge);
}

.buton-ikincil {
  background: transparent;
  color: var(--renk-birincil);
  border: 2px solid var(--renk-kenar);
}

.buton-ikincil:hover {
  border-color: var(--renk-birincil);
  background: var(--renk-arka-yumusak);
}

/* ---------- Kahraman (Hero) ---------- */
.kahraman {
  position: relative;
  padding: 5rem 0 4.5rem;
  background: linear-gradient(160deg, var(--renk-arka-yumusak) 0%, #ffffff 100%);
  overflow: hidden;
}

.kahraman::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -120px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(31, 182, 160, 0.12), transparent 70%);
  border-radius: 50%;
}

.kahraman-ic {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
  position: relative;
}

.kahraman-rozet {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: rgba(10, 125, 90, 0.08);
  color: var(--renk-birincil);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 1.4rem;
}

.kahraman h1 {
  font-size: 3rem;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 1.2rem;
  font-weight: 800;
}

.kahraman h1 .vurgu {
  background: linear-gradient(120deg, var(--renk-birincil), var(--renk-vurgu));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.kahraman p {
  font-size: 1.15rem;
  color: var(--renk-metin-acik);
  margin-bottom: 2rem;
  max-width: 520px;
}

.kahraman-butonlar {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.kahraman-gorsel {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Batarya görseli (saf CSS/SVG) */
.batarya-kart {
  width: 100%;
  max-width: 360px;
  background: #fff;
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--golge-buyuk);
  border: 1px solid var(--renk-kenar);
}

.batarya-gosterge {
  height: 26px;
  background: var(--renk-arka-yumusak);
  border-radius: 50px;
  overflow: hidden;
  margin: 1rem 0;
}

.batarya-dolum {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--renk-birincil), var(--renk-vurgu));
  border-radius: 50px;
  transition: width 1.4s ease;
}

.batarya-veri {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.veri-kutu {
  background: var(--renk-arka-yumusak);
  border-radius: 12px;
  padding: 0.9rem 1rem;
}

.veri-kutu .etiket {
  font-size: 0.75rem;
  color: var(--renk-metin-acik);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.veri-kutu .deger {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--renk-birincil);
}

/* ---------- Bölüm Başlıkları ---------- */
.bolum {
  padding: 4.5rem 0;
}

.bolum-yumusak {
  background: var(--renk-arka-yumusak);
}

.bolum-baslik {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.bolum-baslik .etiket {
  display: inline-block;
  color: var(--renk-birincil);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.6rem;
}

.bolum-baslik h2 {
  font-size: 2.2rem;
  letter-spacing: -1px;
  margin-bottom: 0.8rem;
  font-weight: 800;
}

.bolum-baslik p {
  color: var(--renk-metin-acik);
  font-size: 1.05rem;
}

/* ---------- Kart Izgarası ---------- */
.izgara {
  display: grid;
  gap: 1.5rem;
}

.izgara-3 {
  grid-template-columns: repeat(3, 1fr);
}

.izgara-2 {
  grid-template-columns: repeat(2, 1fr);
}

.kart {
  background: #fff;
  border: 1px solid var(--renk-kenar);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--gecis);
}

.kart:hover {
  transform: translateY(-4px);
  box-shadow: var(--golge);
  border-color: transparent;
}

.kart-ikon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(10, 125, 90, 0.1), rgba(31, 182, 160, 0.1));
  border-radius: 12px;
  font-size: 1.6rem;
  margin-bottom: 1.2rem;
}

.kart h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
  font-weight: 700;
}

.kart p {
  color: var(--renk-metin-acik);
  font-size: 0.97rem;
}

/* ---------- İstatistikler ---------- */
.istatistikler {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.istatistik .sayi {
  font-size: 2.6rem;
  font-weight: 800;
  background: linear-gradient(120deg, var(--renk-birincil), var(--renk-vurgu));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.istatistik .aciklama {
  color: var(--renk-metin-acik);
  font-weight: 600;
  font-size: 0.95rem;
}

/* ---------- Blog Kartları ---------- */
.blog-kart {
  background: #fff;
  border: 1px solid var(--renk-kenar);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--gecis);
}

.blog-kart:hover {
  transform: translateY(-4px);
  box-shadow: var(--golge);
}

.blog-gorsel {
  height: 180px;
  background: linear-gradient(135deg, var(--renk-birincil), var(--renk-vurgu));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.9);
}

.blog-icerik {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-etiket {
  display: inline-block;
  align-self: flex-start;
  background: var(--renk-arka-yumusak);
  color: var(--renk-birincil);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.7rem;
  border-radius: 50px;
  margin-bottom: 0.8rem;
}

.blog-kart h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
  font-weight: 700;
  line-height: 1.35;
}

.blog-kart p {
  color: var(--renk-metin-acik);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  flex: 1;
}

.blog-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--renk-metin-acik);
  border-top: 1px solid var(--renk-kenar);
  padding-top: 1rem;
}

/* ---------- Makale (tekil) ---------- */
.makale {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 0;
}

.makale h1 {
  font-size: 2.4rem;
  letter-spacing: -1px;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.makale-meta {
  color: var(--renk-metin-acik);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--renk-kenar);
}

.makale h2 {
  font-size: 1.6rem;
  margin: 2.2rem 0 0.8rem;
  letter-spacing: -0.5px;
}

.makale h3 {
  font-size: 1.25rem;
  margin: 1.6rem 0 0.6rem;
}

.makale p {
  margin-bottom: 1.1rem;
  color: #2a3835;
}

.makale ul,
.makale ol {
  margin: 0 0 1.2rem 1.4rem;
  color: #2a3835;
}

.makale li {
  margin-bottom: 0.5rem;
}

.makale blockquote {
  border-left: 4px solid var(--renk-birincil);
  background: var(--renk-arka-yumusak);
  padding: 1rem 1.5rem;
  border-radius: 0 10px 10px 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--renk-metin-acik);
}

.bilgi-kutu {
  background: rgba(10, 125, 90, 0.06);
  border: 1px solid rgba(10, 125, 90, 0.15);
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
}

.bilgi-kutu strong {
  color: var(--renk-birincil);
}

/* ---------- İletişim ---------- */
.iletisim-izgara {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.iletisim-bilgi-oge {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.iletisim-bilgi-oge .ikon {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--renk-arka-yumusak);
  border-radius: 10px;
  font-size: 1.3rem;
}

.iletisim-bilgi-oge h4 {
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.iletisim-bilgi-oge p {
  color: var(--renk-metin-acik);
  font-size: 0.95rem;
}

.form-grup {
  margin-bottom: 1.2rem;
}

.form-grup label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.45rem;
}

.form-grup input,
.form-grup textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--renk-kenar);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--gecis);
  background: #fff;
}

.form-grup input:focus,
.form-grup textarea:focus {
  outline: none;
  border-color: var(--renk-birincil);
  box-shadow: 0 0 0 3px rgba(10, 125, 90, 0.1);
}

.form-grup textarea {
  resize: vertical;
  min-height: 130px;
}

.form-mesaj {
  padding: 0.9rem 1.2rem;
  border-radius: 10px;
  background: rgba(10, 125, 90, 0.1);
  color: var(--renk-birincil-koyu);
  font-weight: 600;
  margin-top: 1rem;
  display: none;
}

.form-mesaj.gorunur {
  display: block;
}

/* ---------- SSS (Akordeon) ---------- */
.sss-oge {
  background: #fff;
  border: 1px solid var(--renk-kenar);
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.sss-soru {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.2rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--renk-metin);
  font-family: inherit;
}

.sss-soru .isaret {
  flex-shrink: 0;
  transition: transform var(--gecis);
  color: var(--renk-birincil);
  font-size: 1.3rem;
}

.sss-oge.acik .sss-soru .isaret {
  transform: rotate(45deg);
}

.sss-cevap {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--gecis), padding var(--gecis);
  padding: 0 1.5rem;
  color: var(--renk-metin-acik);
}

.sss-oge.acik .sss-cevap {
  max-height: 400px;
  padding: 0 1.5rem 1.3rem;
}

/* ---------- CTA Şeridi ---------- */
.cta-serit {
  background: linear-gradient(135deg, var(--renk-birincil), var(--renk-birincil-koyu));
  border-radius: 20px;
  padding: 3.5rem 2.5rem;
  text-align: center;
  color: #fff;
}

.cta-serit h2 {
  font-size: 2rem;
  margin-bottom: 0.8rem;
  letter-spacing: -0.5px;
}

.cta-serit p {
  opacity: 0.92;
  margin-bottom: 1.8rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.cta-serit .buton-birincil {
  background: #fff;
  color: var(--renk-birincil);
}

.cta-serit .buton-birincil:hover {
  background: var(--renk-ikincil);
  color: var(--renk-metin);
}

/* ---------- Alt Bilgi (Footer) ---------- */
.alt-bilgi {
  background: var(--renk-metin);
  color: #c9d6d2;
  padding: 3.5rem 0 1.5rem;
}

.alt-bilgi-izgara {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.alt-bilgi h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 1.1rem;
}

.alt-bilgi .logo {
  color: #fff;
  margin-bottom: 1rem;
}

.alt-bilgi-aciklama {
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 300px;
}

.alt-bilgi ul {
  list-style: none;
}

.alt-bilgi ul li {
  margin-bottom: 0.6rem;
}

.alt-bilgi ul a {
  color: #c9d6d2;
  font-size: 0.92rem;
}

.alt-bilgi ul a:hover {
  color: #fff;
}

.alt-bilgi-telif {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.88rem;
  color: #8fa39d;
}

/* ---------- Sayfa Başlığı (iç sayfalar) ---------- */
.sayfa-basligi {
  background: linear-gradient(160deg, var(--renk-arka-yumusak), #fff);
  padding: 3.5rem 0;
  text-align: center;
  border-bottom: 1px solid var(--renk-kenar);
}

.sayfa-basligi h1 {
  font-size: 2.6rem;
  letter-spacing: -1px;
  margin-bottom: 0.6rem;
}

.sayfa-basligi p {
  color: var(--renk-metin-acik);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.ekmek-kirintisi {
  font-size: 0.88rem;
  color: var(--renk-metin-acik);
  margin-bottom: 1rem;
}

/* ---------- Duyarlı (Responsive) ---------- */
@media (max-width: 900px) {
  .kahraman-ic {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .kahraman p {
    margin-left: auto;
    margin-right: auto;
  }
  .kahraman-butonlar {
    justify-content: center;
  }
  .kahraman-gorsel {
    order: -1;
  }
  .izgara-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .istatistikler {
    grid-template-columns: repeat(2, 1fr);
  }
  .iletisim-izgara {
    grid-template-columns: 1fr;
  }
  .alt-bilgi-izgara {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .menu-linkler {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--renk-kenar);
    box-shadow: var(--golge);
    transform: translateY(-150%);
    transition: transform var(--gecis);
    align-items: stretch;
  }
  .menu-linkler.acik {
    transform: translateY(0);
  }
  .menu-linkler a {
    padding: 0.8rem 1rem;
  }
  .menu-buton {
    display: flex;
  }
  .kahraman h1 {
    font-size: 2.2rem;
  }
  .bolum-baslik h2 {
    font-size: 1.8rem;
  }
  .izgara-3,
  .izgara-2 {
    grid-template-columns: 1fr;
  }
  .istatistikler {
    grid-template-columns: 1fr 1fr;
  }
  .alt-bilgi-izgara {
    grid-template-columns: 1fr;
  }
  .makale h1 {
    font-size: 1.9rem;
  }
}