/* ============================================================
   CORENSAN — LANDING PAGE STYLES
   Açık tema, editoryal düzen: beyaz zemin, lacivert/gri metin,
   turuncu yalnızca vurgu noktalarında.
   ============================================================ */

/* ---------- CUSTOM PROPERTIES ---------- */
:root {
  /* Renk paleti */
  --color-bg: #FFFFFF;
  --color-bg-soft: #F7F8FA;
  --color-navy: #0A192F;
  --color-gray: #4A4F55;
  --color-border: #E4E7EB;
  --color-orange: #FF4500;
  --color-white: #F5F5F5;

  /* Koyu bölümlerde kullanılan yardımcılar */
  --color-line-dark: rgba(245, 245, 245, 0.12);
  --color-muted-dark: #9AA5B1;

  /* Tipografi */
  --font-serif: "Fraunces", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --fs-hero: clamp(2.6rem, 6vw, 4.6rem);
  --fs-h2: clamp(1.8rem, 3.5vw, 2.7rem);
  --fs-h3: 1.15rem;
  --fs-body: 1rem;
  --fs-small: 0.85rem;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 7.5rem;

  /* Diğer */
  --container: 1200px;
  --transition: 0.25s ease;
}

/* ---------- RESET & BASE ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-gray);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* Sayfa kenarındaki ince dikey referans çizgisi (editoryal detay) */
body::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  left: max(calc((100vw - var(--container)) / 2 - 2rem), 0.75rem);
  width: 1px;
  background-color: var(--color-border);
  pointer-events: none;
  z-index: 1;
}

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

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

ul,
ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

/* Klavye ile gezinen kullanıcılar için net odak halkası */
:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

/* ---------- TİPOGRAFİK YARDIMCILAR ---------- */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--color-navy);
}

em {
  font-style: italic;
}

.section {
  padding-block: var(--space-6);
}

.section-soft {
  background-color: var(--color-bg-soft);
  border-block: 1px solid var(--color-border);
}

.section-dark {
  background-color: var(--color-navy);
  color: var(--color-muted-dark);
}

.section-dark .section-title {
  color: var(--color-white);
}

/* Teknik doküman referansı taşıyan kategori etiketi: "01 / Hizmetler" */
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: var(--space-2);
}

.section-head {
  max-width: 680px;
  margin-bottom: var(--space-5);
}

/* Başlık solda, açıklama sağda: asimetrik editoryal düzen */
.section-head-split {
  max-width: none;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-4);
  align-items: end;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-4);
}

.section-dark .section-head {
  border-color: var(--color-line-dark);
}

.section-title {
  font-size: var(--fs-h2);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.section-desc {
  margin-top: var(--space-2);
  max-width: 46ch;
}

.section-head-split .section-desc {
  margin-top: 0;
  justify-self: end;
}

/* ---------- BUTONLAR ---------- */
.btn {
  display: inline-block;
  padding: 0.85rem 1.9rem;
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition);
}

.btn-primary {
  background-color: var(--color-orange);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-navy);
}

.btn-outline {
  border-color: var(--color-navy);
  color: var(--color-navy);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ============================================================
   HEADER / NAVBAR
   ============================================================ */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  padding-block: var(--space-2);
  transition: background-color var(--transition), padding var(--transition),
    box-shadow var(--transition);
}

/* Scroll sonrası beyazlaşan / blur'lanan hal (JS ile eklenir) */
.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding-block: 0.55rem;
  box-shadow: 0 1px 0 var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.logo {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.34em;
  color: var(--color-navy);
}

/* Admin panelinden yüklenen görsel logo */
.logo img {
  display: block;
  height: 40px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-list {
  display: flex;
  gap: var(--space-3);
}

.nav-link {
  font-size: var(--fs-small);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-gray);
  padding: 0.4rem 0.2rem;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-navy);
  border-bottom-color: var(--color-orange);
}

.btn-nav {
  padding: 0.6rem 1.3rem;
}

/* Mobil menü düğmesi */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle-bar {
  width: 24px;
  height: 1.5px;
  background-color: var(--color-navy);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  padding-block: calc(var(--space-6) + 72px) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

/* %3-4 opaklıkta ince teknik grid dokusu — beyaz zemin üzerinde */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(10, 25, 47, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 25, 47, 0.04) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(to bottom, black 0%, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 85%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
}

.hero-title {
  font-size: var(--fs-hero);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.015em;
  max-width: 900px;
}

.hero-title em {
  color: var(--color-navy);
  font-weight: 500;
}

/* Açıklama + CTA: asimetrik iki kolon */
.hero-lower {
  margin-top: var(--space-4);
  display: grid;
  grid-template-columns: minmax(0, 52ch) 1fr;
  gap: var(--space-4);
  align-items: start;
}

.hero-subtitle {
  font-size: 1.05rem;
  border-left: 2px solid var(--color-orange);
  padding-left: var(--space-3);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-self: end;
  align-self: center;
}

.hero-badges {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
}

.hero-badges li {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--color-gray);
}

.hero-badges li::before {
  content: "· ";
  color: var(--color-orange);
}

/* ============================================================
   PROBLEM / DEĞER ÖNERİSİ (KONTRAST BLOĞU)
   ============================================================ */
.contrast-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--color-border);
}

.contrast-col {
  padding: var(--space-4);
}

.contrast-old {
  background-color: var(--color-bg-soft);
  border-right: 1px solid var(--color-border);
}

.contrast-new {
  background-color: var(--color-bg);
  border-top: 2px solid var(--color-orange);
  margin-top: -1px;
}

.contrast-heading {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-bottom: var(--space-3);
}

.contrast-new .contrast-heading {
  color: var(--color-orange);
}

.contrast-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--space-2);
}

.contrast-list li:last-child {
  margin-bottom: 0;
}

.contrast-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 0.7rem;
  height: 1px;
  background-color: var(--color-gray);
}

.contrast-new .contrast-list li::before {
  background-color: var(--color-orange);
}

.contrast-new .contrast-list li {
  color: var(--color-navy);
}

/* ============================================================
   HİZMETLER (SERVICES) GRID
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--color-border);
  background-color: var(--color-border);
  gap: 1px; /* 1px arayla kartlar arasında ince ayraç çizgisi oluşur */
}

.service-card {
  position: relative;
  background-color: var(--color-bg);
  padding: var(--space-4) var(--space-3);
  transition: background-color var(--transition);
}

.service-card:hover {
  background-color: var(--color-bg-soft);
}

/* Hover'da kartın üstünde beliren ince turuncu çizgi */
.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 100%;
  height: 2px;
  background-color: var(--color-orange);
  transition: right var(--transition);
}

.service-card:hover::before {
  right: 0;
}

.service-index {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-orange);
}

.service-icon {
  width: 44px;
  height: 44px;
  color: var(--color-navy);
  margin-block: var(--space-3);
  transition: color var(--transition);
}

.service-card:hover .service-icon {
  color: var(--color-orange);
}

.service-title {
  font-size: var(--fs-h3);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.service-desc {
  font-size: var(--fs-small);
}

/* ============================================================
   SÜREÇ / METODOLOJİ
   ============================================================ */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.process-step {
  position: relative;
  padding-top: var(--space-3);
}

/* Adımları bağlayan ince çizgi */
.process-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: calc(-1 * var(--space-4));
  height: 1px;
  background-color: var(--color-border);
}

.process-step:last-child::before {
  right: 0;
}

/* Çizgi üzerindeki turuncu işaret */
.process-step::after {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 24px;
  height: 3px;
  background-color: var(--color-orange);
}

.process-num {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 300;
  line-height: 1;
  color: var(--color-orange);
  margin-bottom: var(--space-2);
}

.process-title {
  font-size: var(--fs-h3);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.process-desc {
  font-size: var(--fs-small);
}

/* ============================================================
   NEDEN CORENSAN (CORE VALUES) — koyu kontrast molası
   ============================================================ */
.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.value-item {
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line-dark);
}

.value-icon {
  width: 40px;
  height: 40px;
  color: var(--color-orange);
  margin-bottom: var(--space-3);
}

.value-title {
  font-size: var(--fs-h3);
  font-weight: 500;
  color: var(--color-white);
  margin-bottom: var(--space-1);
}

.value-desc {
  font-size: var(--fs-small);
  color: var(--color-muted-dark);
}

/* ============================================================
   İSTATİSTİK / GÜVEN BANDI
   ============================================================ */
.stats {
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.stat {
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border);
}

.stat-num {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 300;
  line-height: 1.1;
  color: var(--color-orange);
}

.stat-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--fs-small);
  color: var(--color-gray);
  letter-spacing: 0.03em;
}

/* ============================================================
   CTA / İLETİŞİM
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--space-5);
  align-items: start;
}

.contact-details {
  margin-top: var(--space-4);
  display: grid;
  gap: var(--space-3);
}

.contact-details li {
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
}

.contact-detail-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 0.15rem;
}

.contact-details a,
.contact-details span:not(.contact-detail-label) {
  color: var(--color-navy);
}

.contact-details a {
  transition: color var(--transition);
}

.contact-details a:hover,
.contact-details a:focus-visible {
  color: var(--color-orange);
}

/* Form */
.contact-form {
  border: 1px solid var(--color-border);
  padding: var(--space-4);
  display: grid;
  gap: var(--space-3);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.form-field {
  display: grid;
  gap: 0.4rem;
}

.form-field label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray);
}

.form-field input,
.form-field textarea,
.form-field select {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  color: var(--color-navy);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0;
  padding: 0.75rem 1rem;
  transition: border-color var(--transition);
  resize: vertical;
}

.form-field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%234A4F55' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-field input:hover,
.form-field textarea:hover,
.form-field select:hover {
  border-color: var(--color-gray);
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--color-orange);
}

/* Zorunlu alan işareti */
.form-field .req {
  color: var(--color-orange);
}

.form-status {
  font-size: var(--fs-small);
  color: var(--color-orange);
  min-height: 1.2em;
  margin: 0;
}

/* Honeypot alanı: bot koruması — görsel olarak tamamen gizli */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-5) var(--space-3);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr auto;
  gap: var(--space-4);
  align-items: start;
}

.footer-slogan {
  margin-top: var(--space-2);
  font-size: var(--fs-small);
  max-width: 320px;
}

.footer-nav ul {
  display: grid;
  gap: var(--space-1);
}

.footer-nav a {
  font-size: var(--fs-small);
  color: var(--color-gray);
  transition: color var(--transition);
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--color-orange);
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  color: var(--color-gray);
  transition: color var(--transition), border-color var(--transition);
}

.footer-social a:hover,
.footer-social a:focus-visible {
  color: var(--color-orange);
  border-color: var(--color-orange);
}

.footer-bottom {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem 1.5rem;
}

.footer-credit,
.footer-credit a {
  color: var(--color-gray);
  letter-spacing: 0.04em;
  text-decoration: none;
}

.footer-credit a {
  transition: color var(--transition);
}

.footer-credit a:hover,
.footer-credit a:focus-visible {
  color: var(--color-orange);
}

/* ============================================================
   SCROLL-REVEAL ANİMASYONU
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hareket azaltma tercihi olan kullanıcılar için animasyonu kapat */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================================
   RESPONSIVE — TABLET (<= 992px)
   ============================================================ */
@media (max-width: 992px) {
  body::after {
    display: none;
  }

  .section-head-split {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .section-head-split .section-desc {
    justify-self: start;
  }

  .services-grid,
  .values-grid,
  .process-steps,
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* İki kolonlu düzende bağlantı çizgisini satır bazında kes */
  .process-step:nth-child(even)::before {
    right: 0;
  }

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer-social {
    grid-column: 1 / -1;
  }
}

/* ============================================================
   RESPONSIVE — MOBİL (<= 720px)
   ============================================================ */
@media (max-width: 720px) {
  :root {
    --space-6: 4.5rem;
    --space-5: 3rem;
  }

  /* Mobil menü */
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: min(78vw, 320px);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: var(--space-4);
    padding: var(--space-6) var(--space-4);
    background-color: var(--color-bg);
    border-left: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    visibility: hidden;
  }

  .main-nav.open {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: var(--space-2);
  }

  .nav-link {
    font-size: 1.1rem;
  }

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

  .hero-cta {
    justify-self: start;
  }

  .hero-cta .btn {
    width: 100%;
    text-align: center;
  }

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

  .contrast-old {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .services-grid,
  .values-grid,
  .process-steps {
    grid-template-columns: 1fr;
  }

  .process-step::before {
    right: 0;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }
}