/* ==========================================================================
   Biga Bilim Eğitim Kurumları
   main.css — Design System + Components + Sections
   ========================================================================== */

/* ==========================================================================
   1. DESIGN TOKENS (CSS Custom Properties)
   Tüm renkler ve ölçüler merkezi olarak burada tanımlıdır.
   Marka renkleri geldiğinde yalnızca bu bölüm güncellenir.
   ========================================================================== */
:root {
  /* --- Renkler (GEÇİCİ PALET — marka renkleri geldiğinde buradan değiştirilir) --- */
  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-on-primary: #FFFFFF;
  --color-primary-soft: #EEF0FF;
  --color-accent: #0D9488;
  --color-heading: #0F172A;
  --color-body: #334155;
  --color-muted: #475569;
  --color-caption: #64748B;
  --color-line: #E2E8F0;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F8FAFC;
  --color-surface-deep: #0F172A;
  --color-on-deep: #F1F5F9;
  --color-whatsapp: #25D366;
  --color-whatsapp-dark: #075E54;
  --color-focus: #1D4ED8;

  /* --- Tipografi --- */
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: var(--font-body); /* Self-hosted display font eklenecekse sadece bu değişken değiştirilir */

  /* Akışkan tipografi ölçeği */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: clamp(1.125rem, 1rem + 0.4vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.15rem + 1.4vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.35rem + 2.2vw, 2.75rem);
  --text-4xl: clamp(2.25rem, 1.45rem + 3.2vw, 3.75rem);
  --text-display: clamp(2.5rem, 1.6rem + 5.5vw, 5rem);

  --leading-tight: 1.1;
  --leading-normal: 1.6;
  --leading-loose: 1.7;

  /* --- Spacing scale (4px taban) --- */
  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-s: 1rem;
  --space-m: 1.5rem;
  --space-l: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* --- Border radius --- */
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  /* --- Shadow (yumuşak, düşük opaklık) --- */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.1);
  --shadow-s: 0 2px 8px rgba(15, 23, 42, 0.06), 0 8px 24px -12px rgba(15, 23, 42, 0.12);
  --shadow-m: 0 12px 24px -12px rgba(15, 23, 42, 0.16);
  --shadow-l: 0 24px 60px -24px rgba(15, 23, 42, 0.22);

  /* --- Container --- */
  --container-max: 76rem;
  --container-narrow: 46rem;
  --gutter: clamp(1rem, 4vw, 2rem);

  /* --- Breakpoints (mobile-first) --- */
  --bp-sm: 30rem;   /* 480px */
  --bp-md: 48rem;   /* 768px */
  --bp-lg: 64rem;   /* 1024px */
  --bp-xl: 80rem;   /* 1280px */

  /* --- Header --- */
  --header-height: 4.25rem;
  --header-height-scrolled: 3.75rem;
  --header-bg: rgba(255, 255, 255, 0.92);

  /* --- Section --- */
  --section-padding: clamp(4rem, 2rem + 6vw, 7.5rem);

  /* --- Transition --- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ==========================================================================
   2. RESET
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-loose);
  color: var(--color-body);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-heading);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  font-weight: 700;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

/* --- Focus (erişilebilirlik) --- */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

/* --- Skip link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-s);
  z-index: 1000;
  padding: var(--space-xs) var(--space-m);
  background: var(--color-surface-deep);
  color: var(--color-on-deep);
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  color: var(--color-on-deep);
}

/* ==========================================================================
   3. UTILITIES & LAYOUT
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: var(--container-narrow);
}

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

.section--alt {
  background-color: var(--color-surface-alt);
}

.section--deep {
  background-color: var(--color-surface-deep);
  color: var(--color-on-deep);
}

.section-head {
  max-width: var(--container-narrow);
  margin-bottom: var(--space-2xl);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.eyebrow--light {
  color: var(--color-primary-soft);
}

.section-title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-s);
}

.lead {
  font-size: var(--text-lg);
  color: var(--color-muted);
  line-height: var(--leading-loose);
}

.lead--strong {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-heading);
}

/* ==========================================================================
   4. BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xs);
  padding: var(--space-xs) var(--space-l);
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--text-base);
  line-height: 1.4;
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-on-primary);
  box-shadow: var(--shadow-m);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-heading);
}

.btn--ghost:hover {
  border-color: var(--color-heading);
  color: var(--color-heading);
  background-color: var(--color-surface-alt);
}

.btn--whatsapp {
  background-color: var(--color-whatsapp);
  color: var(--color-whatsapp-dark);
}

.btn--whatsapp:hover {
  background-color: #1FB959;
  color: var(--color-whatsapp-dark);
  box-shadow: var(--shadow-m);
}

.btn--sm {
  padding: var(--space-2xs) var(--space-m);
  font-size: var(--text-sm);
}

.btn--lg {
  padding: var(--space-s) var(--space-xl);
  font-size: var(--text-lg);
}

/* ==========================================================================
   5. TAGS / CHIPS
   ========================================================================== */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2xs) var(--space-m);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}

.tag--solid {
  background-color: transparent;
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  justify-content: center;
  margin-top: var(--space-l);
}

/* ==========================================================================
   6. CARDS
   ========================================================================== */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-l);
  overflow: hidden;
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

/* --- Kategori kartı --- */
.card--category {
  display: flex;
  flex-direction: column;
}

.card--category:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-m);
  transform: translateY(-4px);
}

.card__body {
  padding: var(--space-l);
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  flex: 1;
}

.card__title {
  font-size: var(--text-xl);
}

.card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.card__list li {
  position: relative;
  padding-left: var(--space-m);
  line-height: var(--leading-normal);
}

.card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
  opacity: 0.45;
}
.card__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.card--category:hover .card__image {
  transform: scale(1.025);
}

/* --- Program kartı (ikonlu) --- */
.program-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-m);
}

.card--program {
  padding: var(--space-l);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.card--program:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-m);
  transform: translateY(-3px);
}

.card--program__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-m);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.card--program__title {
  font-size: var(--text-base);
  font-weight: 700;
}

.card--program__desc {
  font-size: var(--text-sm);
  color: var(--color-caption);
  line-height: var(--leading-normal);
}

/* --- Yaş kartı --- */
.age-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-m);
}

.card--age {
  padding: var(--space-l);
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.card--age:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-m);
  transform: translateY(-3px);
}

.card--age--primary {
  border-color: var(--color-primary);
}

.card--age__title {
  font-size: var(--text-xl);
  color: var(--color-primary);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-primary-soft);
}

.card--age__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.card--age__list li {
  position: relative;
  padding-left: var(--space-m);
}

.card--age__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
  opacity: 0.45;
}

/* ==========================================================================
   7. HEADER & NAVIGATION
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background-color: transparent;
}

/* Blur, header'ın kendisine değil ::before katmanına uygulanır.
   Aksi halde backdrop-filter, fixed .site-nav için yeni bir
   containing block oluşturur ve menü viewport yerine header'a
   göre kırpılır. ::before, .site-nav'ın atası olmadığı için
   bu davranışı tetiklemez. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: transparent;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  opacity: 0;
  transition:
    background-color var(--transition-base),
    opacity var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-xs);
}

.site-header.is-scrolled::before {
  background-color: var(--header-bg);
  opacity: 1;
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-s);
  min-height: var(--header-height);
  transition: min-height var(--transition-base);
}

.site-header.is-scrolled .site-header__bar {
  min-height: var(--header-height-scrolled);
}

/* --- Brand / Logotype --- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-heading);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.brand:hover {
  color: var(--color-heading);
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background-color: var(--color-surface);
  padding: var(--space-l) var(--gutter);
  transform: translateX(100%);
  visibility: hidden;
  transition:
    transform var(--transition-base),
    visibility var(--transition-base);
  overflow-y: auto;
}
/* Scroll sonrası mobil menü üst kenarını küçülen header ile hizala.
   Yalnızca mobilde top değeri güncellenir; height set edilmez.
   Desktop'ta .site-nav position: static olduğundan kural etkisizdir. */
@media (max-width: 1023px) {
  .site-header.is-scrolled .site-nav {
    top: var(--header-height-scrolled);
  }
}
.site-nav.is-open {
  transform: translateX(0);
  visibility: visible;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.site-nav__link {
  display: block;
  padding: var(--space-s) var(--space-xs);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-heading);
  border-radius: var(--radius-m);
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.site-nav__link:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

/* --- Header CTA --- */
.header-cta {
  display: inline-flex;
  flex-shrink: 0;
}

/* Mobil menü CTA — yalnızca <1024px görünür; desktop'ta .header-cta kullanılır */
.mobile-nav-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: var(--space-l);
  flex-shrink: 0;
}

/* --- Hamburger (Nav Toggle) --- */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: var(--space-2xs);
  border-radius: var(--radius-m);
  background-color: var(--color-surface-alt);
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
  background-color: var(--color-primary-soft);
}

.nav-toggle__line {
  display: block;
  width: 24px;
  height: 2px;
  margin-inline: auto;
  border-radius: var(--radius-pill);
  background-color: var(--color-heading);
  transition:
    transform var(--transition-base),
    opacity var(--transition-fast),
    background-color var(--transition-fast);
}

.nav-toggle.is-active .nav-toggle__line {
  background-color: var(--color-primary);
}

.nav-toggle.is-active .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   8. HERO
   ========================================================================== */
.hero {
  position: relative;
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  background:
    radial-gradient(60% 50% at 85% 10%, #EEF0FF 0%, transparent 60%),
    radial-gradient(50% 40% at 10% 100%, #F0FDFA 0%, transparent 55%),
    var(--color-surface);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.hero__title {
  font-size: var(--text-display);
  font-weight: 800;
  margin-bottom: var(--space-m);
}

.hero__lead {
  font-size: var(--text-xl);
  color: var(--color-muted);
  line-height: var(--leading-loose);
  margin-bottom: var(--space-l);
  max-width: 36rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
}


.hero__visual {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
}

.hero__image {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  display: block;
}

/* ==========================================================================
   9. SHOWCASE
   ========================================================================== */
.showcase__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.showcase__visual {
  position: relative;
}

.showcase__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
}

.showcase__big-text {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-heading);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

.showcase__desc {
  font-size: var(--text-lg);
  color: var(--color-muted);
  line-height: var(--leading-loose);
}

.showcase__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.showcase__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.showcase__list li {
  position: relative;
  padding-left: var(--space-l);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-heading);
}

.showcase__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  opacity: 0.5;
}

.showcase__image {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-xl);
}
/* ==========================================================================
   10. CATEGORY GRID
   ========================================================================== */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-l);
}

/* ==========================================================================
   11. REASON LIST ("Neden Biga Bilim?")
   ========================================================================== */
.reason-list {
  display: flex;
  flex-direction: column;
}

.reason {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-s) var(--space-l);
  padding-block: var(--space-l);
  border-bottom: 1px solid var(--color-line);
  align-items: start;
}

.reason:first-of-type {
  padding-top: 0;
}

.reason:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.reason__num {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.6;
  line-height: 1;
}

.reason__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-xs);
}

.reason__desc {
  font-size: var(--text-base);
  color: var(--color-muted);
  max-width: 40rem;
}

/* ==========================================================================
   12. GALLERY (Editorial Grid)
   ========================================================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-s);
}

.gallery-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.gallery-item:first-child {
  grid-column: 1 / -1;
}

.gallery-item .ph {
  width: 100%;
}

.gallery-item--tall .ph {
  aspect-ratio: 4 / 5;
}

.gallery-item--wide .ph {
  aspect-ratio: 3 / 2;
}

.gallery-item--square .ph {
  aspect-ratio: 1 / 1;
}

.gallery-item .ph {
  aspect-ratio: 4 / 3;
}

.gallery-item__caption {
  font-size: var(--text-xs);
  color: var(--color-caption);
  letter-spacing: 0.03em;
}

/* ==========================================================================
   13. CTA
   ========================================================================== */
.cta__inner {
  text-align: center;
}

.cta__title {
  font-size: var(--text-3xl);
  color: var(--color-on-deep);
  margin-bottom: var(--space-s);
}

.cta__text {
  font-size: var(--text-lg);
  color: var(--color-on-deep);
  opacity: 0.85;
  margin-bottom: var(--space-l);
}

/* ==========================================================================
   14. FOOTER
   ========================================================================== */
.site-footer {
  background-color: var(--color-surface-deep);
  color: var(--color-on-deep);
  padding-top: var(--space-3xl);
}

.site-footer a {
  color: var(--color-on-deep);
  opacity: 0.85;
}

.site-footer a:hover {
  color: var(--color-primary-soft);
  opacity: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .brand {
  color: var(--color-on-deep);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-xs);
  display: flex;
}

.footer-brand__desc {
  font-size: var(--text-sm);
  opacity: 0.7;
  max-width: 22rem;
  margin-top: var(--space-xs);
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-on-deep);
  opacity: 0.6;
  margin-bottom: var(--space-m);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.footer-links a {
  font-size: var(--text-sm);
}

.footer-address {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  font-style: normal;
  font-size: var(--text-sm);
  opacity: 0.85;
}

.footer-address strong {
  color: var(--color-on-deep);
  font-weight: 600;
}

.footer-bottom {
  padding-block: var(--space-l);
  text-align: center;
  font-size: var(--text-sm);
  opacity: 0.6;
}
/* ==========================================================================
   ROBOTİK FEATURE
   ========================================================================== */

.robotics-feature__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: center;
}

.robotics-feature__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.robotics-feature__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  width: fit-content;
  padding: var(--space-2xs) var(--space-m);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 700;
}

.robotics-feature__eyebrow-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.robotics-feature__title {
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3.5rem);
  line-height: 1.05;
  max-width: 13ch;
}

.robotics-feature__title span {
  display: block;
  color: var(--color-primary);
}

.robotics-feature__lead {
  max-width: 34rem;
  font-size: var(--text-lg);
  color: var(--color-muted);
}

.robotics-feature__benefits {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-m);
  margin-top: var(--space-s);
}

.robotics-benefit {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-s);
  align-items: start;
}

.robotics-benefit__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-m);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 800;
}

.robotics-benefit h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-3xs);
}

.robotics-benefit p {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: var(--leading-normal);
}

.robotics-feature__cta {
  width: fit-content;
  margin-top: var(--space-m);
  padding-inline: 2rem;
}

.robotics-feature__visual {
  overflow: hidden;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-l);
}

.robotics-feature__visual img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}

.robotics-feature__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-m);
  margin-top: var(--space-2xl);
}

.robotics-stat {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-s);
  align-items: center;
  padding: var(--space-l);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-xs);
  padding: 1.25rem;
}

.robotics-stat__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-m);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-xl);
}

.robotics-stat h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3xs);
}

.robotics-stat p {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: var(--leading-normal);
}

@media (min-width: 48rem) {
  .robotics-feature__benefits {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .robotics-feature__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 64rem) {
  .robotics-feature__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.15fr);
    gap: 3rem;
    align-items: center;
  }
.robotics-feature__title {
    max-width: 12ch;
  }
  .robotics-feature__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 2rem;
  }
}


/* ==========================================================================
   15. PLACEHOLDER (Görsel alanları)
   Gerçek fotoğraflar geldiğinde .ph blokları <img> ile değiştirilir.
   Bu bölüm o zaman tamamen kaldırılabilir veya img ile değiştirilir.
   ========================================================================== */
.ph {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-l);
  overflow: hidden;
  background-color: var(--color-primary-soft);
  isolation: isolate;
}

.ph::before,
.ph::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  z-index: -1;
}

.ph::before {
  width: 60%;
  aspect-ratio: 1;
  top: -25%;
  right: -15%;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.16) 0%, transparent 70%);
}

.ph::after {
  width: 50%;
  aspect-ratio: 1;
  bottom: -20%;
  left: -10%;
  background: radial-gradient(circle, rgba(13, 148, 136, 0.14) 0%, transparent 70%);
}

.ph__label {
  position: relative;
  z-index: 1;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  opacity: 0.55;
  text-align: center;
  padding-inline: var(--space-s);
}

.ph--hero {
  aspect-ratio: 4 / 3;
}

.ph--category {
  aspect-ratio: 4 / 3;
  border-radius: 0;
  border-bottom: 1px solid var(--color-line);
}

.ph--showcase {
  aspect-ratio: 4 / 3;
  width: 100%;
}

.ph--gallery {
  aspect-ratio: 4 / 3;
}

.ph--map {
  aspect-ratio: 16 / 9;
  margin-top: var(--space-m);
  width: 100%;
  max-width: 26rem;
}

/* ==========================================================================
   16. REVEAL ANIMATION
   ========================================================================== */
/* Reveal yalnızca JS aktifken çalışır — no-JS'de içerik her zaman görünür */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

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

/* ==========================================================================
   17. REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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

  .card:hover,
  .card--program:hover,
  .card--age:hover {
    transform: none;
  }
}

/* ==========================================================================
   18. RESPONSIVE — BREAKPOINTS
   Mobile-first: temel stiller yukarıda; burada büyüyen ekranlar.
   ========================================================================== */

/* --- 400px altı (çok dar mobil — 320px güvenliği) --- */
@media (max-width: 25rem) {
  .brand__mark {
    display: none;
  }

  .brand__name {
    font-size: var(--text-base);
  }

  .header-cta {
    padding-inline: var(--space-s);
  }

  .site-header__bar {
    gap: var(--space-2xs);
  }
}

/* --- 480px+ (sm) --- */
@media (min-width: 480px) {
  .program-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-m);
  }
}

/* --- 768px+ (md) --- */
@media (min-width: 768px) {
  .section-head {
    margin-bottom: var(--space-3xl);
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-m);
  }

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

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

  .ph--hero {
    aspect-ratio: 4 / 5;
  }

  .ph--showcase {
    aspect-ratio: 4 / 5;
  }

  /* Galeri daha editoriale döner */
  .gallery-item:first-child {
    grid-column: span 2;
  }

  .gallery-item--tall {
    grid-row: span 2;
  }

  .gallery-item--tall .ph {
    aspect-ratio: auto;
    height: 100%;
  }

  .gallery-item--wide {
    grid-column: span 2;
  }

  .gallery-item--square .ph,
  .gallery-item .ph {
    aspect-ratio: 4 / 3;
  }
}

/* --- 1024px+ (lg) --- */
@media (min-width: 1024px) {
  /* Header: tam menü görünür */
  .site-header__bar {
    gap: var(--space-l);
  }

    .site-nav {
    position: static;
    height: auto;
    transform: none;
    visibility: visible;
    background: transparent;
    padding: 0;
    overflow: visible;
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: center;
  }

  .site-nav__list {
    flex-direction: row;
    gap: var(--space-2xs);
  }

  .site-nav__link {
    padding: var(--space-2xs) var(--space-s);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-pill);
  }

  .site-nav__link:hover {
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
  }

  .nav-toggle {
    display: none;
  }

  .mobile-nav-cta {
    display: none;
  }

  /* Hero 2 sütun */
  .hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .hero {
    padding-top: calc(var(--header-height) + var(--space-4xl));
    padding-bottom: var(--space-4xl);
  }

  /* Showcase 2 sütun */
  .showcase__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }

  .showcase--reverse .showcase__grid .showcase__visual {
    order: 2;
  }

  /* Kategori grid 3 sütun — ilk 2 kart büyük */
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .category-grid .card--category:nth-child(1),
  .category-grid .card--category:nth-child(2) {
    grid-column: span 1;
  }

  .category-grid .card--category:nth-child(3) {
    grid-column: span 1;
  }

  /* Program grid 4 sütun */
  .program-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Yaş grid 3 sütun */
  .age-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Footer 3 sütun */
  .footer-grid {
    grid-template-columns: 2fr 1fr 2fr;
    gap: var(--space-2xl);
  }

  .ph--hero {
    aspect-ratio: 4 / 5;
    max-height: 650px;
  }

  .ph--showcase {
    aspect-ratio: 4 / 5;
    max-height: 560px;
  }
}

/* --- 1280px+ (xl) --- */
@media (min-width: 1280px) {
  .hero__grid {
    gap: var(--space-3xl);
  }

  .age-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .age-grid .card--age {
    grid-template-rows: auto 1fr;
  }
}

/* ==========================================================================
   19. BODY SCROLL LOCK (mobil menü açıkken)
   ========================================================================== */
body.no-scroll {
  overflow: hidden;
}

/* ==========================================================================
   20. PRINT (basit)
   ========================================================================== */
@media print {
  .site-header,
  .nav-toggle,
  .cta,
  .site-footer,
  .floating-whatsapp {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }

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



/* ==========================================================================
   NEDEN BİGA BİLİM
   ========================================================================== */

.why-section {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(
      45% 40% at 100% 0%,
      rgba(79, 70, 229, 0.08) 0%,
      transparent 70%
    ),
    radial-gradient(
      40% 35% at 0% 100%,
      rgba(13, 148, 136, 0.05) 0%,
      transparent 70%
    ),
    var(--color-surface-alt);
}


/* ---------- Heading ---------- */

.why-section__head {
  max-width: 52rem;
  margin-bottom: var(--space-3xl);
}

.why-section__title {
  max-width: 12ch;
  margin-bottom: var(--space-m);

  font-size: clamp(2.4rem, 1.5rem + 4vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.why-section__title span {
  display: block;
  color: var(--color-primary);
}

.why-section__intro {
  max-width: 42rem;

  font-size: var(--text-lg);
  line-height: var(--leading-loose);
  color: var(--color-muted);
}


/* ---------- Grid ---------- */

.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-m);
}


/* ---------- Card ---------- */

.why-card {
  position: relative;
  min-height: 22rem;
  padding: clamp(1.75rem, 3vw, 3rem);

  display: flex;
  flex-direction: column;
  align-items: flex-start;

  overflow: hidden;

  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);

  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.why-card:hover {
  transform: translateY(-5px);
  border-color: rgba(79, 70, 229, 0.28);
  box-shadow: var(--shadow-m);
}


/* ---------- Büyük sayı ---------- */

.why-card__number {
  position: absolute;
  top: -0.12em;
  right: 0.08em;

  font-size: clamp(6rem, 14vw, 11rem);
  font-weight: 800;
  line-height: 1;

  color: var(--color-primary);
  opacity: 0.055;

  pointer-events: none;
  user-select: none;
}


/* ---------- Icon ---------- */

.why-card__icon {
  position: relative;
  z-index: 1;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 58px;
  height: 58px;

  margin-bottom: auto;

  border-radius: var(--radius-m);

  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.why-card__icon svg {
  width: 27px;
  height: 27px;
}


/* ---------- Content ---------- */

.why-card__title {
  position: relative;
  z-index: 1;

  margin-top: var(--space-2xl);
  margin-bottom: var(--space-s);

  font-size: clamp(1.4rem, 1.1rem + 1vw, 2rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.why-card__text {
  position: relative;
  z-index: 1;

  max-width: 28rem;

  font-size: var(--text-base);
  line-height: var(--leading-loose);
  color: var(--color-muted);
}


/* ---------- Accent card ---------- */

.why-card--accent {
  background:
    linear-gradient(
      145deg,
      rgba(79, 70, 229, 0.10),
      rgba(79, 70, 229, 0.03)
    ),
    var(--color-surface);

  border-color: rgba(79, 70, 229, 0.20);
}

.why-card--accent .why-card__icon {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.why-card--accent .why-card__number {
  opacity: 0.075;
}


/* ---------- Tablet ---------- */

@media (min-width: 48rem) {

  .why-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-l);
  }

  .why-card {
    min-height: 24rem;
  }
}


/* ---------- Desktop ---------- */

@media (min-width: 64rem) {

  .why-section__head {
    margin-bottom: var(--space-3xl);
  }

  .why-grid {
    gap: var(--space-l);
  }

  /*
   * Editorial görünüm:
   * 1 ve 4 numaralı kartlar hafif daha geniş hissettirilebilir.
   */
  .why-card:nth-child(1),
  .why-card:nth-child(4) {
    min-height: 26rem;
  }

  .why-card:nth-child(2),
  .why-card:nth-child(3) {
    min-height: 23rem;
  }
}


/* ---------- Reduced Motion ---------- */

@media (prefers-reduced-motion: reduce) {

  .why-card {
    transition: none;
  }

  .why-card:hover {
    transform: none;
  }
}
.why-card__text {
  position: relative;
  z-index: 1;
  max-width: 28rem;
  font-size: clamp(0.95rem, 0.9rem + 0.15vw, 1.05rem);
  line-height: 1.65;
  color: var(--color-muted);
}
.why-section__head {
  max-width: 52rem;
  margin-bottom: var(--space-2xl);
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-s);
  margin-top: var(--space-l);
}

.btn--ghost-light {
  color: var(--color-on-deep);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.btn--ghost-light:hover {
  color: var(--color-on-deep);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 30rem) {
  .cta__actions {
    flex-direction: column;
  }

  .cta__actions .btn {
    width: 100%;
  }
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.brand__logo {
  display: block;
  width: auto;
  height: 58px;
  object-fit: contain;
}
@media (min-width: 64rem) {
  .brand__logo {
    height: 68px;
  }
}
/* Mobil + tablet header: 1024px altı */
@media (max-width: 63.99rem) {

  .header-cta {
    display: none;
  }

  .brand__logo {
    height: 48px;
    width: auto;
    max-width: 180px;
    object-fit: contain;
  }

  .site-header__bar {
    gap: var(--space-2xs);
  }
}


@media (min-width: 1024px) {

  .header-cta {

    display: inline-flex;

  }

  .mobile-nav-cta {

    display: none;

  }

  .nav-toggle {

    display: none;

  }

  .brand__logo {

    height: 68px;

    width: auto;

    max-width: none;

  }

}

.mobile-nav-cta {
  display: flex;
  width: 100%;
  margin-top: var(--space-l);
}

@media (min-width: 1024px) {
  .mobile-nav-cta {
    display: none;
  }
}
@media (max-width: 25rem) {
  .brand__logo {
    height: 42px;
    max-width: 150px;
  }
}