/* ===================================
   GÖKÇELI - Çevre Dostu Web Sitesi
   Modern, Minimal, Sürdürülebilir
   =================================== */

/* ===== CSS VARIABLES (Çevreci Renk Paleti) ===== */
:root {
  /* Ana Yeşil Tonları */
  --color-primary: #2d6a4f;
  --color-primary-light: #40916c;
  --color-primary-dark: #1b4332;
  
  /* Toprak Tonları */
  --color-secondary: #95d5b2;
  --color-accent: #52b788;
  
  /* Nötr Renkler */
  --color-white: #ffffff;
  --color-light: #f8f9fa;
  --color-light-gray: #e9ecef;
  --color-gray: #6c757d;
  --color-dark: #212529;
  
  /* Semantic Renkler */
  --color-success: #52b788;
  --color-warning: #f77f00;
  --color-eco: #95d5b2;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Header Height */
  --header-height: 90px;
}

/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== UTILITIES ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-3xl) 0;
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section__subtitle {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.section__description {
  font-size: var(--font-size-lg);
  color: var(--color-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  cursor: pointer;
  text-align: center;
}

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

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

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

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

.btn--full {
  width: 100%;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 90px;
  padding: var(--space-sm) 0;
}

.nav__logo-img {
  height: 90px;
  width: auto;
}

.nav__list {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-dark);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link:focus::after {
  width: 100%;
}

.nav__link--catalog {
  background-color: var(--color-primary);
  color: var(--color-white) !important;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--border-radius);
  margin-left: var(--space-sm);
}

.nav__link--catalog::after {
  display: none;
}

.nav__link--catalog:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.nav__toggle,
.nav__close {
  display: none;
}

/* Mobile Navigation */
@media screen and (max-width: 768px) {
  .nav {
    height: 70px;
  }
  
  .nav__logo-img {
    height: 60px;
  }
  
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--color-white);
    box-shadow: var(--shadow-xl);
    padding: var(--space-xl) var(--space-lg);
    transition: right var(--transition-base);
  }
  
  .nav__menu.show-menu {
    right: 0;
  }
  
  .nav__list {
    flex-direction: column;
    gap: var(--space-md);
    align-items: flex-start;
  }
  
  .nav__link {
    font-size: var(--font-size-lg);
  }
  
  .nav__toggle,
  .nav__close {
    display: block;
    font-size: var(--font-size-xl);
    cursor: pointer;
    color: var(--color-primary);
  }
  
  .nav__close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
  }
}

/* ===== HERO SECTION ===== */
.hero {
  margin-top: var(--header-height);
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--color-light) 0%, var(--color-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="rgba(45,106,79,0.05)"/></svg>');
  background-size: 200px;
  opacity: 0.3;
  pointer-events: none;
}

.hero__container {
  position: relative;
  z-index: 1;
}

.hero__content {
  max-width: 700px;
  margin-bottom: var(--space-xl);
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.hero__title-highlight {
  color: var(--color-primary);
  position: relative;
}

.hero__description {
  font-size: var(--font-size-lg);
  color: var(--color-gray);
  margin-bottom: var(--space-xl);
  line-height: 1.8;
}

.hero__buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.stat {
  text-align: center;
  padding: var(--space-md);
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}

.stat__number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.stat__label {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
}

/* ===== ABOUT SECTION ===== */
.about {
  background-color: var(--color-white);
}

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

.about__text {
  font-size: var(--font-size-base);
  color: var(--color-gray);
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.about__features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.feature {
  text-align: center;
  padding: var(--space-md);
  background-color: var(--color-light);
  border-radius: var(--border-radius);
  transition: transform var(--transition-base);
}

.feature:hover {
  transform: translateY(-5px);
}

.feature__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-sm);
}

.feature__title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--space-xs);
}

.feature__text {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
}

.about__image {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.about__image:hover img {
  transform: scale(1.05);
}

/* ===== PRODUCTS SECTION ===== */
.products {
  background-color: var(--color-light);
}

.products__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.product-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-5px);
}

.product-card__image {
  position: relative;
  height: 240px;
  overflow: hidden;
  background-color: var(--color-light-gray);
}

.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-card__image img {
  transform: scale(1.1);
}

.product-card__badge {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-warning);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--border-radius);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.product-card__badge.eco {
  background-color: var(--color-success);
}

.product-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.product-card__content {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
}

.product-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.product-card__specs {
  margin-bottom: var(--space-md);
  flex: 1;
}

.product-card__specs li {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
  padding: var(--space-xs) 0;
  padding-left: var(--space-md);
  position: relative;
}

.product-card__specs li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

.product-card__link {
  display: inline-flex;
  align-items: center;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition-base);
  gap: var(--space-xs);
}

.product-card__link:hover {
  gap: var(--space-sm);
}

/* ===== SUSTAINABILITY SECTION ===== */
.sustainability {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
}

.sustainability .section__subtitle {
  color: var(--color-secondary);
}

.sustainability .section__title {
  color: var(--color-white);
}

.sustainability__content {
  max-width: 900px;
  margin: 0 auto;
}

.sustainability__text {
  text-align: center;
}

.sustainability__text p {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
  opacity: 0.95;
}

.sustainability__goals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.goal {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.goal:hover {
  background-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
}

.goal__icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-md);
}

.goal h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.goal p {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  line-height: 1.6;
}

/* ===== CONTACT SECTION ===== */
.contact {
  background-color: var(--color-white);
}

.contact__container {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-2xl);
  max-width: 1000px;
  margin: 0 auto;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact__item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.contact__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact__item h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--space-xs);
}

.contact__item p {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form__group {
  display: flex;
  flex-direction: column;
}

.form__input,
.form__textarea {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  border: 2px solid var(--color-light-gray);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-base);
  background-color: var(--color-white);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--color-dark);
  color: var(--color-light-gray);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer__logo {
  height: 100px;
  width: auto;
  margin-bottom: var(--space-md);
  filter: brightness(0) invert(1);
}

.footer__text {
  font-size: var(--font-size-sm);
  line-height: 1.6;
  opacity: 0.8;
}

.footer__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

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

.footer__links a {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  transition: all var(--transition-base);
}

.footer__links a:hover {
  opacity: 1;
  color: var(--color-secondary);
  padding-left: var(--space-xs);
}

.footer__social {
  display: flex;
  gap: var(--space-md);
}

.social__link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.social__link:hover {
  background-color: var(--color-primary);
  transform: translateY(-3px);
}

.footer__bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--font-size-sm);
  opacity: 0.7;
}

/* ===== SCROLL TO TOP BUTTON ===== */
.scroll-top {
  position: fixed;
  bottom: 110px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
}

.scroll-top.show {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-5px);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablets (768px and below) */
@media screen and (max-width: 768px) {
  :root {
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2rem;
    --font-size-5xl: 2.5rem;
    --space-3xl: 4rem;
  }
  
  .section__title {
    font-size: var(--font-size-2xl);
  }
  
  .hero__title {
    font-size: var(--font-size-3xl);
  }
  
  .about__container {
    grid-template-columns: 1fr;
  }
  
  .about__features {
    grid-template-columns: 1fr;
  }
  
  .contact__container {
    grid-template-columns: 1fr;
  }
  
  .products__grid {
    grid-template-columns: 1fr;
  }
  
  .sustainability__goals {
    grid-template-columns: 1fr;
  }
  
  .footer__container {
    grid-template-columns: 1fr;
  }
  
  .scroll-top {
    bottom: 95px;
    right: 20px;
  }
}

/* Mobile (480px and below) */
@media screen and (max-width: 480px) {
  :root {
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 3rem;
  }
  
  .container {
    padding: 0 var(--space-sm);
  }
  
  .hero__buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .hero__stats {
    grid-template-columns: 1fr;
  }
  
  .scroll-top {
    bottom: 90px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */

/* Lazy loading animation */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity var(--transition-base);
}

img[loading="lazy"].loaded {
  opacity: 1;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
  /* Implement if needed */
}

/* Print styles */
@media print {
  .header,
  .nav,
  .footer,
  .scroll-top,
  .btn {
    display: none;
  }
  
  body {
    color: #000;
    background: #fff;
  }
}