/* ==========================================================================
   T4 GROUP ACADEMY - SADE (MINIMALIST) TASARIM SİSTEMİ
   ========================================================================== */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  
  /* T4 Group Kurumsal Renkleri (Academy için) */
  --accent-blue: #0369a1;
  --accent-blue-hover: #075985;
  --border-color: #e2e8f0;
  
  --radius-lg: 12px;
  --transition-fast: 0.2s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

body {
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  height: 90px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.nav-link:hover {
  color: var(--accent-blue);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-fast);
}

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

.btn-primary:hover {
  background: var(--accent-blue);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
}

/* Typography elements */
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-blue);
  background: rgba(3, 105, 161, 0.1);
  padding: 0.4rem 1rem;
  border-radius: 50px;
  margin-bottom: 1.5rem;
}

.highlight {
  color: var(--accent-blue);
}

.lede {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Sections */
.section {
  padding: 100px 0;
}

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

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3rem;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* Hero */
.hero {
  position: relative;
  padding-top: 200px;
  padding-bottom: 120px;
  text-align: center;
  overflow: hidden;
  background: var(--bg-secondary);
}

.hero-video-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-video-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.15);
  transform-origin: center center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

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

.align-center {
  align-items: center;
}

/* Cards */
.card {
  background: #fff;
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 30px rgba(0,0,0,0.03);
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.06);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.card h3 {
  margin-bottom: 0.75rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 0;
}

.image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--border-color);
  border-radius: var(--radius-lg);
  aspect-ratio: 4/3;
  width: 100%;
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

.footer-logo {
  display: inline-block;
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  font-family: 'Outfit', sans-serif;
  margin-bottom: 1rem;
}

.footer-tagline {
  font-size: 1.25rem;
  font-family: 'Outfit', sans-serif;
  margin-bottom: 1rem;
  color: #e2e8f0;
}

.footer-copy {
  color: #94a3b8;
  font-size: 0.9rem;
  margin-top: 2rem;
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .hero-buttons {
    flex-direction: column;
  }
}

/* Floating WhatsApp Button */
.whatsapp-float {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #25d366;
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
  z-index: 999;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.whatsapp-float svg {
  width: 30px;
  height: 30px;
}

.whatsapp-float:hover {
  transform: scale(1.08);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

@media (max-width: 640px) {
  .whatsapp-float {
    right: 1rem;
    bottom: 1rem;
    width: 50px;
    height: 50px;
  }
  .whatsapp-float svg {
    width: 26px;
    height: 26px;
  }
}