/* ============================================================
   Sancaktepe Telefon Teknik Servis — style.css
   Mobile-First | CSS Variables | Production
   ============================================================ */

/* ===== Design Tokens ===== */
:root {
  --color-primary: #0F172A;
  --color-secondary: #2563EB;
  --color-accent: #06B6D4;
  --color-bg: #F8FAFC;
  --color-text: #1E293B;
  --color-card: #FFFFFF;
  --color-muted: #64748B;
  --color-border: #E2E8F0;

  --gradient: linear-gradient(135deg, var(--color-secondary), var(--color-accent));

  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, .15);

  --container: 1200px;
  --space: clamp(3.5rem, 8vw, 6rem);

  --font: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --transition: .3s cubic-bezier(.4, 0, .2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}
img, iframe { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== Layout Helpers ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.container--narrow { max-width: 760px; }
.section { padding-block: var(--space); }
.section--alt { background: #fff; }
.section--dark { background: var(--color-primary); color: #fff; }
.text-gradient {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .85rem 1.6rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-3px); }
.btn:active { transform: translateY(-1px); }
.btn--primary { background: var(--gradient); color: #fff; box-shadow: 0 8px 20px rgba(37, 99, 235, .35); }
.btn--whatsapp { background: #25D366; color: #fff; box-shadow: 0 8px 20px rgba(37, 211, 102, .3); }
.btn--ghost { background: transparent; border: 2px solid var(--color-border); color: var(--color-text); }
.btn--ghost:hover { border-color: var(--color-secondary); color: var(--color-secondary); }

/* ===== Loader ===== */
.loader {
  position: fixed; inset: 0; z-index: 9999;
  display: grid; place-items: center;
  background: var(--color-primary);
  transition: opacity .5s ease, visibility .5s ease;
}
.loader.hidden { opacity: 0; visibility: hidden; }
.loader__spinner {
  width: 48px; height: 48px;
  border: 4px solid rgba(255, 255, 255, .2);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
  padding-block: .9rem;
}
.navbar.scrolled {
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.nav__logo {
  font-weight: 800; font-size: 1.05rem; color: var(--color-primary);
  display: flex; align-items: center; gap: .4rem;
}
.nav__logo--light { color: #fff; }
.navbar:not(.scrolled) .nav__logo { color: var(--color-primary); }

.nav__menu { display: none; gap: 1.75rem; }
.nav__link {
  font-weight: 500; font-size: .95rem; color: var(--color-text);
  position: relative; padding-block: .25rem; transition: color var(--transition);
}
.nav__link::after {
  content: ''; position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; background: var(--gradient); transition: width var(--transition);
}
.nav__link:hover, .nav__link.active { color: var(--color-secondary); }
.nav__link.active::after { width: 100%; }

.nav__cta { display: none; }

.nav__toggle { display: flex; flex-direction: column; gap: 5px; padding: .4rem; }
.nav__toggle span {
  width: 26px; height: 3px; background: var(--color-primary);
  border-radius: 3px; transition: transform var(--transition), opacity var(--transition);
}
.nav__toggle.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav__toggle.active span:nth-child(2) { opacity: 0; }
.nav__toggle.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Mobile dropdown */
@media (max-width: 991px) {
  .nav__menu {
    position: fixed; inset: 0 0 auto 0; top: 64px;
    flex-direction: column; gap: 0;
    background: #fff; box-shadow: var(--shadow);
    padding: 1rem 1.25rem; display: flex;
    transform: translateY(-120%); transition: transform var(--transition);
  }
  .nav__menu.open { transform: translateY(0); }
  .nav__menu li { border-bottom: 1px solid var(--color-border); }
  .nav__link { display: block; padding: .9rem 0; }
}

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  padding-top: 8rem; padding-bottom: 4rem;
  background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, .12), transparent 55%),
              radial-gradient(circle at 10% 90%, rgba(37, 99, 235, .12), transparent 50%),
              var(--color-bg);
}
.hero__inner { display: grid; gap: 3rem; align-items: center; }
.hero__badge {
  display: inline-block; background: rgba(37, 99, 235, .1); color: var(--color-secondary);
  font-weight: 600; font-size: .85rem; padding: .45rem 1rem; border-radius: 50px; margin-bottom: 1.25rem;
}
.hero__title { font-size: clamp(2.2rem, 7vw, 3.6rem); line-height: 1.1; font-weight: 900; letter-spacing: -.02em; }
.hero__subtitle { margin: 1.25rem 0 2rem; font-size: 1.1rem; color: var(--color-muted); max-width: 520px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }
.hero__features { display: flex; flex-wrap: wrap; gap: 1.25rem; margin-top: 2rem; font-weight: 500; color: var(--color-muted); font-size: .9rem; }

.hero__visual { display: flex; justify-content: center; }
.hero__card {
  background: var(--gradient); border-radius: 28px; padding: 1.5rem;
  box-shadow: var(--shadow-lg); animation: float 6s ease-in-out infinite;
}
.hero__card img { border-radius: 18px; }

/* Floating shapes */
.hero__shapes .shape {
  position: absolute; border-radius: 50%; filter: blur(40px); opacity: .5; z-index: 0;
}
.shape--1 { width: 280px; height: 280px; background: var(--color-secondary); top: -60px; right: -40px; animation: float 8s ease-in-out infinite; }
.shape--2 { width: 220px; height: 220px; background: var(--color-accent); bottom: -50px; left: -30px; animation: float 10s ease-in-out infinite reverse; }
.shape--3 { width: 160px; height: 160px; background: #818cf8; top: 40%; left: 50%; animation: float 7s ease-in-out infinite; }
.hero__inner { position: relative; z-index: 1; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-22px); }
}

/* ===== Stats ===== */
.stats { padding-block: 0; transform: translateY(-2.5rem); }
.stats__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.stat-card {
  background: var(--color-card); border-radius: var(--radius);
  padding: 1.75rem 1rem; text-align: center; box-shadow: var(--shadow);
}
.stat-card__number { display: block; font-size: clamp(1.8rem, 6vw, 2.6rem); font-weight: 900; color: var(--color-secondary); }
.stat-card__label { color: var(--color-muted); font-size: .9rem; margin-top: .25rem; }

/* ===== Section Heads ===== */
.section__head { text-align: center; max-width: 640px; margin: 0 auto 3rem; }
.section__tag {
  display: inline-block; font-weight: 700; font-size: .8rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--color-accent); margin-bottom: .75rem;
}
.section__title { font-size: clamp(1.6rem, 5vw, 2.4rem); font-weight: 800; letter-spacing: -.02em; }
.section--dark .section__title { color: #fff; }
.section__desc { color: var(--color-muted); margin-top: .75rem; }
.section--dark .section__desc { color: #cbd5e1; }

/* ===== Services Grid ===== */
.services__grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.service-card {
  background: var(--color-card); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.service-card__icon {
  display: inline-grid; place-items: center; width: 56px; height: 56px;
  font-size: 1.6rem; border-radius: var(--radius-sm); background: rgba(37, 99, 235, .08); margin-bottom: 1rem;
}
.service-card h3 { font-size: 1.15rem; margin-bottom: .4rem; }
.service-card p { color: var(--color-muted); font-size: .92rem; }

/* ===== Why Grid ===== */
.why__grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.why-card {
  background: var(--color-card); border-radius: var(--radius); padding: 1.75rem;
  box-shadow: var(--shadow-sm); transition: transform var(--transition), box-shadow var(--transition);
}
.why-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.why-card__icon { font-size: 1.8rem; display: block; margin-bottom: .75rem; }
.why-card h3 { font-size: 1.1rem; margin-bottom: .35rem; }
.why-card p { color: var(--color-muted); font-size: .92rem; }

/* ===== Timeline ===== */
.timeline { position: relative; display: grid; gap: 2rem; padding-left: 1.75rem; }
.timeline::before {
  content: ''; position: absolute; left: 9px; top: 6px; bottom: 6px;
  width: 2px; background: var(--color-border);
}
.timeline__item { position: relative; }
.timeline__num {
  position: absolute; left: -1.75rem; top: 0;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--gradient); color: #fff; font-size: .75rem; font-weight: 700;
  display: grid; place-items: center; box-shadow: 0 0 0 4px var(--color-bg);
}
.timeline__item h3 { font-size: 1.1rem; }
.timeline__item p { color: var(--color-muted); font-size: .92rem; }

/* ===== Testimonials (Glassmorphism) ===== */
.testimonials__grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.testimonial {
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .15);
  backdrop-filter: blur(12px);
  border-radius: var(--radius); padding: 1.75rem;
  transition: transform var(--transition);
}
.testimonial:hover { transform: translateY(-6px); }
.testimonial__stars { color: #FBBF24; letter-spacing: 2px; margin-bottom: .75rem; }
.testimonial blockquote { font-style: italic; color: #e2e8f0; }
.testimonial figcaption { margin-top: 1rem; font-weight: 600; color: var(--color-accent); }

/* ===== Accordion ===== */
.accordion { display: grid; gap: 1rem; }
.accordion__item { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.accordion__header {
  width: 100%; text-align: left; padding: 1.25rem 1.5rem;
  font-weight: 600; font-size: 1rem; color: var(--color-text);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.accordion__icon { font-size: 1.4rem; color: var(--color-secondary); transition: transform var(--transition); }
.accordion__item.active .accordion__icon { transform: rotate(45deg); }
.accordion__body { max-height: 0; overflow: hidden; transition: max-height var(--transition); }
.accordion__body p { padding: 0 1.5rem 1.25rem; color: var(--color-muted); }

/* ===== Contact ===== */
.contact__grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.contact__card { background: var(--color-card); border-radius: var(--radius); padding: 2rem; box-shadow: var(--shadow); }
.contact__list { display: grid; gap: 1rem; margin-bottom: 1.75rem; }
.contact__list li { display: flex; align-items: center; gap: .75rem; font-weight: 500; }
.contact__list span { font-size: 1.25rem; }
.contact__actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.contact__map { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); min-height: 300px; }
.contact__map iframe { width: 100%; height: 100%; min-height: 300px; border: 0; }

/* ===== Footer ===== */
.footer { background: var(--color-primary); color: #cbd5e1; padding-top: var(--space); }
.footer__grid { display: grid; grid-template-columns: 1fr; gap: 2rem; padding-bottom: 2.5rem; }
.footer__desc { margin: 1rem 0; font-size: .92rem; max-width: 320px; }
.footer__social { display: flex; gap: .75rem; font-size: 1.3rem; }
.footer__social a { transition: transform var(--transition); }
.footer__social a:hover { transform: translateY(-4px); }
.footer__col h4 { color: #fff; margin-bottom: 1rem; font-size: 1rem; }
.footer__col ul { display: grid; gap: .6rem; font-size: .92rem; }
.footer__col a:hover { color: var(--color-accent); }
.footer__bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding-block: 1.5rem; text-align: center; font-size: .85rem; }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 900;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--gradient); color: #fff; font-size: 1.3rem;
  box-shadow: var(--shadow); opacity: 0; visibility: hidden;
  transform: translateY(20px); transition: all var(--transition);
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); }

/* ===== Scroll Reveal ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive: Tablet ===== */
@media (min-width: 600px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .why__grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 2fr 1fr 1fr; }
  .stats__grid { grid-template-columns: repeat(4, 1fr); }
}

/* ===== Responsive: Desktop ===== */
@media (min-width: 992px) {
  .nav__menu { display: flex; position: static; transform: none; background: none; box-shadow: none; padding: 0; }
  .nav__menu li { border: none; }
  .nav__cta { display: inline-flex; }
  .nav__toggle { display: none; }

  .hero__inner { grid-template-columns: 1.1fr 1fr; }
  .services__grid { grid-template-columns: repeat(4, 1fr); }
  .why__grid { grid-template-columns: repeat(3, 1fr); }
  .testimonials__grid { grid-template-columns: repeat(3, 1fr); }
  .contact__grid { grid-template-columns: 1fr 1.2fr; }

  /* Horizontal timeline on desktop */
  .timeline {
    grid-template-columns: repeat(5, 1fr); gap: 1.5rem;
    padding-left: 0; padding-top: 2.5rem;
  }
  .timeline::before { left: 6%; right: 6%; top: 9px; bottom: auto; width: auto; height: 2px; }
  .timeline__num { left: 50%; top: -2.5rem; transform: translateX(-50%); }
  .timeline__item { text-align: center; }
}

/* ===== Accessibility: reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; border-radius: 4px; }