/* =============================================================
   Defcin E-Ticaret — main.css
   B2B Kurumsal Tasarım Sistemi
   Versiyon: Sprint 1 — Temel Kurulum
   ============================================================= */

/* --- 1. Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Playfair+Display:wght@600;700&display=swap');

/* --- 2. CSS Değişkenleri (Design Tokens) --- */
:root {
  /* Renk Paleti */
  --color-navy:        #0D1B2A;   /* Ana koyu lacivert */
  --color-navy-mid:    #1A2E45;   /* Orta lacivert */
  --color-navy-light:  #243C57;   /* Açık lacivert */
  --color-gold:        #C9A84C;   /* Altın vurgu */
  --color-gold-light:  #E2C97E;   /* Açık altın */
  --color-silver:      #A8B2BC;   /* Gümüş vurgu */
  --color-silver-light:#D4DBE2;   /* Açık gümüş */
  --color-white-soft:  #F5F4F0;   /* Kırık beyaz */
  --color-white:       #FFFFFF;
  --color-text:        #1C2B3A;   /* Ana gövde metin */
  --color-text-muted:  #5A7184;   /* İkincil metin */
  --color-border:      #DDE3E9;   /* Çizgi / sınır */
  --color-bg-light:    #F8F7F4;   /* Açık arka plan */
  --color-bg-section:  #EFF1F4;   /* Bölüm arka planı */
  --color-success:     #2E7D52;
  --color-error:       #C0392B;

  /* Tipografi */
  --font-sans:   'Inter', system-ui, -apple-system, sans-serif;
  --font-serif:  'Playfair Display', Georgia, serif;

  --fs-xs:   0.75rem;    /* 12px */
  --fs-sm:   0.875rem;   /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-md:   1.125rem;   /* 18px */
  --fs-lg:   1.25rem;    /* 20px */
  --fs-xl:   1.5rem;     /* 24px */
  --fs-2xl:  1.875rem;   /* 30px */
  --fs-3xl:  2.25rem;    /* 36px */
  --fs-4xl:  3rem;       /* 48px */
  --fs-5xl:  3.75rem;    /* 60px */

  --fw-light:     300;
  --fw-normal:    400;
  --fw-medium:    500;
  --fw-semibold:  600;
  --fw-bold:      700;
  --fw-extrabold: 800;

  --lh-tight:  1.2;
  --lh-snug:   1.35;
  --lh-normal: 1.6;
  --lh-loose:  1.8;

  /* Boşluklar */
  --space-1:  0.25rem;   /* 4px */
  --space-2:  0.5rem;    /* 8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */
  --space-32: 8rem;      /* 128px */

  /* Köşe Yuvarlamaları */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   20px;
  --radius-full: 9999px;

  /* Gölgeler */
  --shadow-sm:  0 1px 3px rgba(13, 27, 42, 0.08), 0 1px 2px rgba(13, 27, 42, 0.04);
  --shadow-md:  0 4px 16px rgba(13, 27, 42, 0.10), 0 2px 6px rgba(13, 27, 42, 0.06);
  --shadow-lg:  0 10px 40px rgba(13, 27, 42, 0.14), 0 4px 16px rgba(13, 27, 42, 0.08);
  --shadow-xl:  0 20px 60px rgba(13, 27, 42, 0.18);
  --shadow-gold: 0 4px 20px rgba(201, 168, 76, 0.25);

  /* Geçişler */
  --transition-fast:   150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow:   500ms ease;

  /* Layout */
  --container-max: 1200px;
  --container-wide: 1400px;
  --header-h: 80px;
  --section-py: var(--space-20);
}

/* --- 3. Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-normal);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
  list-style: none;
}

button,
input,
textarea,
select {
  font: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

/* İkon SVG'leri — global kural */
.trust-card__icon svg,
.b2b-item__icon svg,
.feature-item__icon svg,
.quality-point__num ~ * svg,
[class*="__icon"] svg {
  width: 22px;
  height: 22px;
  fill: none !important;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: block;
  flex-shrink: 0;
}

/* --- 4. Tipografi Yardımcıları --- */
.text-serif {
  font-family: var(--font-serif);
}

.text-xs    { font-size: var(--fs-xs); }
.text-sm    { font-size: var(--fs-sm); }
.text-base  { font-size: var(--fs-base); }
.text-md    { font-size: var(--fs-md); }
.text-lg    { font-size: var(--fs-lg); }
.text-xl    { font-size: var(--fs-xl); }
.text-2xl   { font-size: var(--fs-2xl); }
.text-3xl   { font-size: var(--fs-3xl); }
.text-4xl   { font-size: var(--fs-4xl); }

.font-light     { font-weight: var(--fw-light); }
.font-normal    { font-weight: var(--fw-normal); }
.font-medium    { font-weight: var(--fw-medium); }
.font-semibold  { font-weight: var(--fw-semibold); }
.font-bold      { font-weight: var(--fw-bold); }
.font-extrabold { font-weight: var(--fw-extrabold); }

.text-gold   { color: var(--color-gold); }
.text-silver { color: var(--color-silver); }
.text-muted  { color: var(--color-text-muted); }
.text-white  { color: var(--color-white); }
.text-navy   { color: var(--color-navy); }

.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

/* --- 5. Layout Yardımcıları --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

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

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

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

.section--navy-mid {
  background-color: var(--color-navy-mid);
  color: var(--color-white);
}

.section--light {
  background-color: var(--color-bg-light);
}

.section--gray {
  background-color: var(--color-bg-section);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex        { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between{ display: flex; align-items: center; justify-content: space-between; }
.flex-col    { flex-direction: column; }
.flex-wrap   { flex-wrap: wrap; }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }

/* --- 6. Bölüm Başlıkları --- */
.section-label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--space-4);
}

.section-title {
  font-family: var(--font-sans);
  font-size: var(--fs-3xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--color-navy);
  margin-bottom: var(--space-5);
}

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

.section-desc {
  font-size: var(--fs-md);
  line-height: var(--lh-loose);
  color: var(--color-text-muted);
  max-width: 640px;
}

.section-desc--white {
  color: var(--color-silver-light);
}

.section-header {
  margin-bottom: var(--space-12);
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-desc {
  margin-inline: auto;
}

/* --- 7. Butonlar --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.8rem 1.75rem;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-gold), #B8932A);
  color: var(--color-navy);
  box-shadow: var(--shadow-gold);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
  box-shadow: 0 6px 28px rgba(201, 168, 76, 0.4);
  transform: translateY(-2px);
}

.btn--outline {
  border: 1.5px solid var(--color-gold);
  color: var(--color-gold);
  background: transparent;
}

.btn--outline:hover {
  background: var(--color-gold);
  color: var(--color-navy);
}

.btn--outline-white {
  border: 1.5px solid rgba(255,255,255,0.5);
  color: var(--color-white);
  background: transparent;
}

.btn--outline-white:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--color-white);
}

.btn--whatsapp {
  background: #25D366;
  color: #fff;
}

.btn--whatsapp:hover {
  background: #1EBF59;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);
}

.btn--lg {
  padding: 1rem 2.25rem;
  font-size: var(--fs-base);
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--fs-xs);
}

/* --- 8. Kartlar --- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card__img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

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

.card__title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-navy);
  margin-bottom: var(--space-3);
}

.card__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: var(--lh-loose);
  margin-bottom: var(--space-5);
}

/* --- 9. Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  background: var(--color-white);
  box-shadow: var(--shadow-md);
}

.navbar__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0;
}

.navbar__logo {
  display: flex;
  align-items: center;
}

.navbar__logo img {
  height: 56px;
  width: auto;
}

.navbar__nav {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-8);
}

.navbar__link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-gold);
  transition: width var(--transition-normal);
}

.trust-card__icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-gold);
  fill: none !important;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-gold);
}

.navbar__link:hover::after,
.navbar__link.active::after {
  width: 100%;
}

.navbar__cta {
  margin-left: var(--space-4);
}

/* Hamburger menü */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  padding: var(--space-2);
}

.navbar__hamburger span {
  display: block;
  height: 2px;
  background: var(--color-navy);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

.navbar__hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.navbar__hamburger.open span:nth-child(2) {
  opacity: 0;
}
.navbar__hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobil menü paneli */
.navbar__mobile {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
  flex-direction: column;
  gap: var(--space-4);
  z-index: 999;
}

.navbar__mobile.open {
  display: flex;
}

.navbar__mobile .navbar__link {
  font-size: var(--fs-base);
  color: var(--color-text);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

/* --- 10. Footer --- */
.footer {
  background: var(--color-navy);
  color: var(--color-silver-light);
  padding-block: var(--space-16) var(--space-8);
  border-top: 1px solid rgba(201, 168, 76, 0.15);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer__brand-logo-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: #FFFFFF;
  padding: 8px 12px;
  border-radius: 6px;
  margin-bottom: var(--space-4);
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.footer__brand-logo {
  display: block;
  margin-bottom: -4px;
  height: 42px;
  width: auto;
}

.footer__brand-desc {
  font-size: var(--fs-sm);
  line-height: var(--lh-loose);
  color: var(--color-silver);
  max-width: 300px;
}

.footer__heading {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--space-5);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--fs-sm);
  color: var(--color-silver);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-gold);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  color: var(--color-silver);
  margin-bottom: var(--space-3);
}

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.07);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.footer__legal {
  display: flex;
  gap: var(--space-6);
}

.footer__legal a {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__legal a:hover {
  color: var(--color-silver);
}

/* --- 11. Altın Çizgi Vurgusu --- */
.gold-line {
  display: inline-block;
  width: 50px;
  height: 2px;
  background: var(--color-gold);
  margin-bottom: var(--space-5);
}

/* --- 12. Rozet / Etiket --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.05em;
}

.badge--gold {
  background: rgba(201, 168, 76, 0.15);
  color: var(--color-gold);
  border: 1px solid rgba(201, 168, 76, 0.3);
}

.badge--navy {
  background: var(--color-navy);
  color: var(--color-white);
}

/* --- 13. Ayraç --- */
.divider {
  width: 100%;
  height: 1px;
  background: var(--color-border);
  margin-block: var(--space-8);
}

.divider--gold {
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  height: 1.5px;
}

/* --- 14. Geri Plan Ayrımı --- */
.bg-navy     { background-color: var(--color-navy); }
.bg-navy-mid { background-color: var(--color-navy-mid); }
.bg-light    { background-color: var(--color-bg-light); }
.bg-white    { background-color: var(--color-white); }

/* --- 15. Yardımcı --- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-auto { margin-top: auto; }
.mb-4    { margin-bottom: var(--space-4); }
.mb-6    { margin-bottom: var(--space-6); }
.mb-8    { margin-bottom: var(--space-8); }
.mb-12   { margin-bottom: var(--space-12); }

.pt-header { padding-top: var(--header-h); }

/* --- 16. Sticky WhatsApp Mobil Barı --- */
.sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 998;
  background: var(--color-navy-mid);
  border-top: 1px solid rgba(201, 168, 76, 0.2);
  padding: var(--space-3) var(--space-4);
  gap: var(--space-3);
}

/* --- 17. Animasyonlar --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.animate-fadeInUp {
  animation: fadeInUp 0.7s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.35s; }
.delay-4 { animation-delay: 0.5s; }

/* --- 18. Altın Gradient Metin --- */
.text-gold-gradient {
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 50%, var(--color-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}