/* ==========================================
   Hayber Elektrik - Ana Stil Dosyası
   Modern Kurumsal Web Sitesi Tasarımı
   ========================================== */

/* CSS Değişkenleri - Tasarım Sistemi */
:root {
  /* Renk Paleti - Elektrik Teması */
  --primary-blue: #0d47a1;
  --primary-blue-light: #1976d2;
  --primary-blue-dark: #002171;
  --accent-orange: #ff6f00;
  --accent-orange-light: #ff9800;

  /* Nötr Renkler */
  --white: #ffffff;
  --off-white: #f8f9fa;
  --light-gray: #e0e0e0;
  --gray: #9e9e9e;
  --dark-gray: #424242;
  --black: #212121;

  /* Gradient Tanımları */
  --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-orange) 0%, var(--accent-orange-light) 100%);
  --gradient-overlay: linear-gradient(135deg, rgba(13, 71, 161, 0.9) 0%, rgba(25, 118, 210, 0.8) 100%);

  /* Tipografi */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --font-size-small: 14px;
  --font-size-large: 18px;
  --font-size-h1: 3.5rem;
  --font-size-h2: 2.5rem;
  --font-size-h3: 1.75rem;
  --font-size-h4: 1.5rem;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;

  /* Shadow */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 15px 50px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset ve Temel Stiller */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-primary);
  color: var(--black);
  background-color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Tipografi */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

h4 {
  font-size: var(--font-size-h4);
}

p {
  margin-bottom: var(--spacing-sm);
  line-height: 1.8;
}

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

a:hover {
  color: var(--accent-orange);
}

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

/* Container ve Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-accent);
  margin: var(--spacing-sm) auto 0;
  border-radius: 2px;
}

/* Header & Navigation */
header {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-normal);
}

header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.logo {
  height: 50px;
  transition: transform var(--transition-normal);
}

.logo:hover {
  transform: scale(1.05);
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

nav a {
  color: var(--black);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent-orange);
  transition: width var(--transition-normal);
}

nav a:hover::after,
nav a.active::after {
  width: 80%;
}

nav a:hover,
nav a.active {
  color: var(--primary-blue);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--primary-blue);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

/* Hero Section */
.hero {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-primary);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  max-width: 800px;
  padding: 0 var(--spacing-md);
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease;
}

.hero-content p {
  font-size: var(--font-size-large);
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
  animation: fadeInUp 1s ease 0.2s backwards;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  font-size: var(--font-size-base);
  text-align: center;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.btn-secondary:hover {
  background: var(--white);
  color: var(--primary-blue);
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  height: 100%;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
}

.card-title {
  color: var(--primary-blue);
  margin-bottom: var(--spacing-xs);
}

.card-text {
  color: var(--dark-gray);
}

/* Grid Layout */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

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

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

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

/* Stats Section */
.stats {
  background: var(--gradient-primary);
  color: var(--white);
  padding: var(--spacing-xl) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  text-align: center;
}

.stat-item h3 {
  font-size: 3rem;
  margin-bottom: var(--spacing-xs);
  color: var(--accent-orange-light);
}

.stat-item p {
  font-size: var(--font-size-large);
  opacity: 0.9;
}

/* Products Section */
.product-category {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--off-white);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.product-category:hover {
  background: var(--white);
  box-shadow: var(--shadow-md);
}

.product-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-blue);
}

/* Footer */
footer {
  background: var(--black);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  margin-bottom: var(--spacing-sm);
  color: var(--accent-orange-light);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: var(--light-gray);
}

.footer-section a:hover {
  color: var(--accent-orange-light);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--dark-gray);
  color: var(--gray);
}

/* Contact Form */
.contact-form {
  background: var(--off-white);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--dark-gray);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--light-gray);
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-blue);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 1s ease;
}

.fade-in-up {
  animation: fadeInUp 1s ease;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}

.mt-0 {
  margin-top: 0;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

/* Responsive Design */
@media (max-width: 1024px) {
  :root {
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --font-size-h1: 2rem;
    --font-size-h2: 1.75rem;
  }

  .hamburger {
    display: flex;
  }

  nav {
    position: absolute;
    top: 100%;
    left: -100%;
    width: 100%;
    background: var(--white);
    box-shadow: var(--shadow-md);
    transition: left var(--transition-normal);
  }

  nav.active {
    left: 0;
  }

  nav ul {
    flex-direction: column;
    padding: var(--spacing-md);
  }

  nav a::after {
    display: none;
  }

  .hero {
    height: 500px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

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

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

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

@media (max-width: 480px) {
  :root {
    --spacing-xl: 3rem;
    --spacing-lg: 2rem;
  }

  .hero-content h1 {
    font-size: 1.75rem;
  }
}