:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #eef2f5;
  --text: #13202f;
  --muted: #5d6c7b;
  --line: #d9e0e7;
  --dark: #0f1720;
  --dark-2: #16212d;
  --primary: #1f5fae;
  --primary-2: #2f7ad6;
  --white: #ffffff;
  --shadow: 0 14px 34px rgba(15, 23, 32, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.container {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

/* HEADER */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--dark);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  font-size: 0.95rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

.main-nav a:hover {
  color: var(--dark);
}

.main-nav .nav-cta {
  padding: 10px 16px;
  border: 1px solid var(--primary);
  border-radius: 999px;
  color: var(--primary);
}

.main-nav .nav-cta:hover {
  background: var(--primary);
  color: var(--white);
}

.menu-toggle {
  display: none;
  border: none;
  background: transparent;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--dark);
}

/* HERO */

.hero {
  position: relative;
  min-height: 86vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(120deg, rgba(15, 23, 32, 0.94), rgba(15, 23, 32, 0.76)),
    url("https://images.unsplash.com/photo-1517976487492-5750f3195933?auto=format&fit=crop&w=1600&q=80") center/cover no-repeat;
  color: var(--white);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(15, 23, 32, 0.88) 0%, rgba(15, 23, 32, 0.62) 48%, rgba(15, 23, 32, 0.30) 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 90px 0;
}

.eyebrow,
.section-label {
  margin: 0 0 12px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--primary-2);
}

.hero-copy h1,
.section-head h2,
.section-intro h2,
.contact-box h2 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero-copy h1 {
  max-width: 760px;
  font-size: clamp(2.8rem, 5vw, 5rem);
}

.hero-copy h1 span {
  display: block;
  color: #d9e8ff;
}

.hero-text {
  max-width: 640px;
  margin: 24px 0 0;
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.84);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 10px;
  font-weight: 700;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background: #194d8d;
}

.btn-secondary {
  border: 1px solid rgba(255, 255, 255, 0.24);
  color: var(--white);
  background: transparent;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* HERO RIGHT IMAGES */

.hero-media {
  width: 100%;
  max-width: 320px;
  justify-self: end;
}

.hero-media-label {
  margin-bottom: 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.74);
}

.hero-cert-grid {
  display: grid;
  gap: 14px;
  align-items: start;
}

.hero-cert-grid--two {
  grid-template-columns: 1fr;
}

.hero-cert-item {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-cert-item img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.hero-cert-item--top img {
  max-width: 240px;
  max-height: 150px;
}

/* QUICK PRODUCTS */

.quick-products {
  position: relative;
  z-index: 2;
  margin-top: 0;
  padding: 56px 0 24px;
  background: var(--bg);
}

.quick-intro {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 28px;
  padding: 0 4px;
}

.quick-kicker {
  margin: 0 0 10px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--primary);
}

.quick-intro-left h2 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(2rem, 3.5vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--dark);
}

.quick-intro-right p {
  margin: 0;
  max-width: 560px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.quick-card {
  min-height: 178px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 26px 24px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.quick-card-media {
  width: 100%;
  height: 160px;
  margin-bottom: 18px;
  border-radius: 12px;
  overflow: hidden;
  background: #eef2f5;
}

.quick-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.quick-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 18px 38px rgba(15, 23, 32, 0.12);
}

.quick-card h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--dark);
  font-weight: 800;
}

.quick-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted);
}

/* GENERAL SECTIONS */

.section {
  padding: 84px 0;
}

.section-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 38px;
  align-items: start;
}

.section-head,
.section-intro {
  margin-bottom: 26px;
}

.section-head h2,
.section-intro h2,
.contact-box h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.section-copy p,
.contact-text,
.contact-info p {
  color: var(--muted);
  font-size: 1rem;
}

.section-copy p {
  margin: 0 0 16px;
}

/* SECTORS */

.sectors {
  background: var(--surface);
}

.sector-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.sector-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.sector-image {
  height: 220px;
  overflow: hidden;
}

.sector-image img {
  height: 100%;
  object-fit: cover;
}

.sector-body {
  padding: 24px;
}

.sector-body h3,
.cap-card h3 {
  margin: 0 0 14px;
  font-size: 1.25rem;
  color: var(--dark);
}

.sector-body ul,
.cap-card p {
  margin: 0;
  color: var(--muted);
}

.sector-body ul {
  padding-left: 20px;
}

/* CAPABILITIES */

.capabilities {
  background: var(--surface-2);
}

.cap-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.cap-card {
  padding: 20px;
}

/* CONTACT */

.contact-section {
  background: var(--surface-2);
}

.contact-box {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
  align-items: start;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.contact-text {
  margin-top: 16px;
}

.contact-info {
  padding: 24px;
  background: var(--dark);
  border-radius: 16px;
}

.contact-info p {
  margin: 0 0 12px;
  color: rgba(255, 255, 255, 0.82);
}

.contact-info p:last-child {
  margin-bottom: 0;
}

.contact-info strong {
  color: var(--white);
}

/* FOOTER */

.site-footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.66);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

/* RESPONSIVE */

@media (max-width: 1100px) {
  .hero-inner,
  .section-grid,
  .contact-box,
  .sector-grid,
  .capability-grid,
  .quick-intro {
    grid-template-columns: 1fr;
  }

  .hero-media {
    max-width: 100%;
    justify-self: start;
  }

  .quick-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-inner {
    padding: 70px 0;
  }
}

@media (max-width: 780px) {
  .container {
    width: min(1200px, calc(100% - 32px));
  }

  .menu-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 78px;
    left: 16px;
    right: 16px;
    padding: 18px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav .nav-cta {
    padding: 0;
    border: none;
    border-radius: 0;
  }

  .section {
    padding: 64px 0;
  }

  .hero-copy h1 {
    font-size: 2.5rem;
  }

  .sector-body,
  .cap-card,
  .contact-box,
  .contact-info,
  .quick-card {
    padding: 20px;
  }
}

@media (max-width: 700px) {
  .quick-products {
    padding: 40px 0 16px;
  }

  .quick-grid {
    grid-template-columns: 1fr;
  }

  .quick-card {
    min-height: auto;
  }

  .hero-cert-item--top img {
    max-width: 200px;
    max-height: 130px;
  }
}

@media (max-width: 600px) {
  .footer-inner {
    padding: 18px 0;
    flex-direction: column;
    align-items: flex-start;
  }
}

/* STANDARDS BLOCK */

.standards-block {
  margin-top: 52px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.std-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.std-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--primary);
  border-radius: 14px;
  padding: 22px 20px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.std-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 38px rgba(15, 23, 32, 0.12);
}

.std-tag {
  margin: 0 0 6px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--primary-2);
}

.std-title {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.3;
}

.std-desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.68;
  color: var(--muted);
}

/* RESPONSIVE */

@media (max-width: 1100px) {
  .std-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .std-grid {
    grid-template-columns: 1fr;
  }

  .standards-block {
    margin-top: 36px;
    padding-top: 28px;
  }
}

/* ENGINEERING FLOW */

.eng-flow {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 52px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.eng-step {
  flex: 1;
  min-width: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.eng-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  font-size: 0.82rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.eng-flow .eng-title {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--dark);
  text-align: center;
  line-height: 1.3;
}

.eng-flow .eng-sub {
  margin: 0;
  font-size: 0.74rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.4;
}

.eng-arrow {
  flex: 0 0 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 30px;
  color: var(--line);
}

/* RESPONSIVE */

@media (max-width: 780px) {
  .eng-arrow {
    flex: 0 0 14px;
  }

  .eng-circle {
    width: 34px;
    height: 34px;
    font-size: 0.74rem;
  }

  .eng-flow .eng-title {
    font-size: 0.74rem;
  }

  .eng-flow .eng-sub {
    display: none;
  }
}

@media (max-width: 500px) {
  .eng-flow {
    gap: 0;
  }

  .eng-arrow {
    flex: 0 0 10px;
  }
}

/* PRODUCTS */

.prod-group {
  margin-bottom: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line);
}

.prod-group:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.prod-group-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
  margin-bottom: 28px;
}

.prod-group-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: -0.02em;
}

.prod-group-desc {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

.prod-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.prod-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.prod-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 38px rgba(15, 23, 32, 0.12);
}

.prod-card-media {
  width: 100%;
  height: 180px;
  overflow: hidden;
  background: var(--surface-2);
}

.prod-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.prod-card-body {
  padding: 22px 20px;
}

.prod-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
  background: #ddeeff;
  border-radius: 4px;
  padding: 2px 8px;
  margin-bottom: 10px;
}

.prod-name {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.3;
}

.prod-desc {
  margin: 0 0 14px;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.68;
}

.prod-specs {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.prod-specs li {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.6;
  padding: 3px 0;
  border-bottom: 1px solid var(--line);
}

.prod-specs li:last-child {
  border-bottom: none;
}

.prod-group {
  scroll-margin-top: 100px; /* header yüksekliği (78px) + biraz boşluk */
}

/* nav bağlantısı */

/* RESPONSIVE */

@media (max-width: 1100px) {
  .prod-group-header {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 700px) {
  .prod-grid {
    grid-template-columns: 1fr;
  }
}

a.quick-card {
  display: block;
  text-decoration: none;
  color: inherit;
}

a.quick-card h3,
a.quick-card p {
  color: inherit;
}

.section-head.center {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-sub {
  margin-top: 12px;
  color: var(--muted);
  font-size: 1rem;
}

/* yeni layout */

.cap-main {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  margin-bottom: 56px;
}

.cap-text {
  font-size: 1rem;
  color: var(--muted);
}

.cap-text p {
  margin-bottom: 16px;
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.cap-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.cap-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}

.cap-card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--dark);
}

.cap-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* responsive */

@media (max-width: 900px) {
  .cap-main {
    grid-template-columns: 1fr;
  }

  .cap-grid {
    grid-template-columns: 1fr;
  }
}


.ai-capability {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.ai-capability-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 32px;
  align-items: start;
}

.ai-capability-left h3 {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--dark);
}

.ai-capability-right p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted);
}

/* responsive */

@media (max-width: 900px) {
  .ai-capability-inner {
    grid-template-columns: 1fr;
  }
}

.hero-cert-grid--four {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  align-items: center;
}

/* normal item */
.hero-cert-item {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* EYDEP ortalama */
.hero-cert-item--center {
  grid-column: span 2;   /* 2 kolonu kapla */
  justify-content: center;
}

.hero-cert-item img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.quality-policy {
  margin-top: 40px;
  padding: 24px 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.quality-title {
  font-size: 18px;
  margin-bottom: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
  color: var(--dark);
}

.quality-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.lang-dropdown {
  position: relative;
  margin-left: 12px;
}

/* üstte görünen */
.lang-current {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.lang-current:hover {
  border-color: var(--primary);
}

/* küçük ok */
.lang-arrow {
  font-size: 0.6rem;
  opacity: 0.6;
}

/* dropdown */
.lang-menu {
  position: absolute;
  top: 110%;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 6px 0;
  min-width: 120px;
  display: none;
  z-index: 10;
}

.lang-menu a {
  display: block;
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--text);
  transition: background 0.2s ease;
}

.lang-menu a:hover {
  background: var(--surface-2);
}

/* hover açılır */
.lang-dropdown:hover .lang-menu {
  display: block;
}