/* ===================================
   KR Solarlink - Modern Corporate Website
   CSS3 with Flexbox & Grid
   =================================== */

/* === CSS Variables === */
:root {
  --primary-green: #00a651;
  --secondary-green: #2ecc71;
  --accent-yellow: #ffd700;
  --dark-green: #1e8449;
  --light-green: #d5f4e6;
  --white: #ffffff;
  --light-gray: #f8f9fa;
  --text-dark: #2c3e50;
  --text-gray: #6c757d;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 5px 25px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

/* === Reset & Base Styles === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  overflow-x: hidden;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-gray);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
  transition: var(--transition);
}

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

/* === Container & Layout === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  color: var(--primary-green);
  position: relative;
  display: inline-block;
  padding-bottom: 15px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-yellow), var(--primary-green));
  border-radius: 2px;
}

.section-title p {
  margin-top: 15px;
  font-size: 1.1rem;
  color: var(--text-gray);
}

/* === Header & Navigation === */
.header-top {
  background-color: var(--primary-green);
  color: var(--white);
  padding: 10px 0;
  font-size: 0.9rem;
}

.header-top-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.header-top-left,
.header-top-right {
  display: flex;
  gap: 30px;
  align-items: center;
}

.header-top-left a,
.header-top-right a {
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.header-top-left a:hover,
.header-top-right a:hover {
  color: var(--accent-yellow);
}

.main-header {
  background-color: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

.header-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-green);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo i {
  color: var(--accent-yellow);
  font-size: 2rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
  align-items: center;
}

.nav-menu a {
  color: var(--text-dark);
  font-weight: 500;
  position: relative;
  padding: 5px 0;
}

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

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

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

/* Dropdown Menu */
.nav-menu li {
  position: relative;
}

.nav-menu .has-dropdown > a::after {
  content: '\f107';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  margin-left: 5px;
  font-size: 0.8rem;
  vertical-align: middle;
}

.nav-menu .has-dropdown:hover > a::after {
  content: '\f106';
}

.nav-menu .submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--white);
  min-width: 220px;
  box-shadow: var(--shadow-lg);
  border-radius: 10px;
  padding: 10px 0;
  margin-top: 10px;
  list-style: none;
  z-index: 1000;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

.nav-menu .has-dropdown:hover .submenu {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.nav-menu .submenu li {
  width: 100%;
  margin: 0;
}

.nav-menu .submenu a {
  display: block;
  padding: 12px 20px;
  color: var(--text-dark);
  font-weight: 400;
  transition: var(--transition);
}

.nav-menu .submenu a::after {
  display: none;
}

.nav-menu .submenu a:hover {
  background-color: var(--light-green);
  color: var(--primary-green);
  padding-left: 25px;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-dark);
  cursor: pointer;
  padding: 10px;
  z-index: 1001;
  position: relative;
}

.mobile-menu-toggle i {
  transition: var(--transition);
}

.mobile-menu-toggle.active i {
  transform: rotate(180deg);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
  display: block;
  opacity: 1;
}

/* === Hero Section === */
.hero {
  background: linear-gradient(135deg, var(--primary-green) 0%, var(--dark-green) 100%);
  color: var(--white);
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  color: var(--white);
  font-size: 3.5rem;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
  color: rgba(255, 255, 255, 0.95);
  font-size: 1.3rem;
  margin-bottom: 40px;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 15px 35px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background-color: var(--accent-yellow);
  color: var(--text-dark);
}

.btn-primary:hover {
  background-color: #ffed4e;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background-color: var(--white);
  color: var(--primary-green);
  transform: translateY(-2px);
}

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

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

/* === Cards === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.card {
  background-color: var(--white);
  border-radius: 15px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}

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

.card-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 2rem;
  color: var(--white);
}

.card h3 {
  color: var(--primary-green);
  margin-bottom: 15px;
}

.card p {
  color: var(--text-gray);
  line-height: 1.8;
}

/* === Features Section === */
.features {
  background-color: var(--light-gray);
}

.feature-item {
  display: flex;
  gap: 20px;
  margin-bottom: 30px;
}

.feature-icon {
  width: 60px;
  height: 60px;
  background-color: var(--light-green);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-green);
  flex-shrink: 0;
}

.feature-content h4 {
  color: var(--text-dark);
  margin-bottom: 10px;
}

/* === Warranty Badge === */
.warranty-badge {
  background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
  color: var(--white);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  margin: 50px 0;
  box-shadow: var(--shadow-lg);
}

.warranty-badge h2 {
  color: var(--white);
  font-size: 2.5rem;
  margin-bottom: 15px;
}

.warranty-badge p {
  color: rgba(255, 255, 255, 0.95);
  font-size: 1.2rem;
}

/* === Subsidy Highlight === */
.subsidy-highlight {
  background: linear-gradient(135deg, var(--accent-yellow), #ffed4e);
  padding: 50px;
  border-radius: 20px;
  text-align: center;
  margin: 50px 0;
  color: var(--text-dark);
}

.subsidy-highlight h2 {
  color: var(--text-dark);
  margin-bottom: 20px;
}

.subsidy-benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.benefit-item {
  background-color: var(--white);
  padding: 25px;
  border-radius: 15px;
  box-shadow: var(--shadow);
}

.benefit-item h3 {
  color: var(--primary-green);
  margin-bottom: 10px;
}

.benefit-item .amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-green);
}

/* === Service Section === */
.service-detail {
  margin-bottom: 60px;
}

.service-header {
  background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
  color: var(--white);
  padding: 30px;
  border-radius: 15px 15px 0 0;
}

.service-header h2 {
  color: var(--white);
  margin-bottom: 10px;
}

.service-content {
  background-color: var(--white);
  padding: 40px;
  border-radius: 0 0 15px 15px;
  box-shadow: var(--shadow);
  border: 1px solid #e0e0e0;
  border-top: none;
}

.service-list {
  list-style: none;
  margin-top: 30px;
}

.service-list li {
  padding: 15px 0;
  padding-left: 30px;
  position: relative;
  color: var(--text-gray);
  border-bottom: 1px solid #f0f0f0;
}

.service-list li:last-child {
  border-bottom: none;
}

.service-list li::before {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
  color: var(--primary-green);
  font-size: 1.2rem;
}

/* === Contact Section === */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

.contact-card {
  background-color: var(--white);
  padding: 30px;
  border-radius: 15px;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

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

.contact-card-icon {
  width: 70px;
  height: 70px;
  background-color: var(--light-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.8rem;
  color: var(--primary-green);
}

.contact-card h3 {
  color: var(--primary-green);
  margin-bottom: 10px;
}

.contact-form {
  background-color: var(--light-gray);
  padding: 40px;
  border-radius: 15px;
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 25px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-dark);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 15px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(0, 166, 81, 0.1);
}

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

.map-container {
  margin-top: 50px;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  height: 450px;
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Contact Form and Map Layout */
.contact-form-and-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
}

@media (max-width: 768px) {
  .contact-form-and-map {
    grid-template-columns: 1fr !important;
    gap: 30px !important;
  }
  
  .map-container {
    margin-top: 30px;
    height: 300px;
  }
  
  .contact-form {
    padding: 25px 20px !important;
  }
  
  .form-group input,
  .form-group textarea {
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  .map-section {
    order: -1; /* Show map first on mobile */
  }
  
  .office-hours-card {
    padding: 20px !important;
  }
  
  .office-hours-card h4 {
    font-size: 1.1rem;
  }
  
  .office-hours-card p {
    font-size: 0.9rem;
  }
}

/* === Footer === */
.footer {
  background: linear-gradient(135deg, var(--text-dark), #1a252f);
  color: var(--white);
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h3 {
  color: var(--accent-yellow);
  margin-bottom: 20px;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 10px;
  display: block;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

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

.social-links a:hover {
  background-color: var(--accent-yellow);
  color: var(--text-dark);
  transform: translateY(-3px);
}

/* === Responsive Design === */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.75rem; }

  .header-top-content {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }

  .header-wrapper {
    flex-wrap: wrap;
  }

  .nav-menu {
    display: none;
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--white);
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 80px 20px 20px;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    z-index: 999;
    transition: right 0.3s ease;
    overflow-y: auto;
  }

  .nav-menu.active {
    display: flex;
    right: 0;
  }

  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid #f0f0f0;
  }

  .nav-menu a {
    display: block;
    padding: 15px 10px;
    width: 100%;
    font-size: 1.1rem;
  }

  .nav-menu a::after {
    display: none;
  }
  
  /* Mobile Dropdown */
  .nav-menu .has-dropdown > a::after {
    float: right;
    margin-top: 5px;
  }
  
  .nav-menu .submenu {
    position: static;
    display: none;
    opacity: 1;
    transform: none;
    box-shadow: none;
    padding: 0;
    margin: 0;
    background-color: var(--light-gray);
    border-radius: 0;
  }
  
  .nav-menu .has-dropdown.active .submenu {
    display: block;
  }
  
  .nav-menu .submenu a {
    padding: 12px 30px;
    font-size: 0.95rem;
  }
  
  .nav-menu .submenu a:hover {
    padding-left: 35px;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .header-wrapper {
    position: relative;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .hero {
    padding: 80px 0 50px;
  }

  .hero {
    background-attachment: scroll !important;
    padding: 80px 0 50px;
  }

  .hero h1 {
    font-size: 2rem;
    line-height: 1.3;
  }

  .hero p {
    font-size: 1rem;
    padding: 0 10px;
  }

  .hero-buttons {
    flex-direction: column;
    gap: 15px;
    padding: 0 10px;
  }

  .hero-buttons .btn {
    width: 100%;
    padding: 12px 25px;
    font-size: 0.9rem;
  }

  .section {
    padding: 50px 0;
  }

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

  .subsidy-benefits {
    grid-template-columns: 1fr;
  }

  .contact-info {
    grid-template-columns: 1fr;
  }

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

  .row {
    grid-template-columns: 1fr !important;
  }

  section .row {
    grid-template-columns: 1fr !important;
  }

  .contact-form {
    margin-bottom: 30px;
    padding: 25px 20px !important;
  }
  
  .contact-form-and-map {
    grid-template-columns: 1fr !important;
    gap: 30px !important;
  }

  .image-gallery {
    grid-template-columns: 1fr;
  }

  .gallery-item {
    aspect-ratio: 16 / 9;
  }

  .service-content > div:first-child {
    height: 250px !important;
  }

  .subsidy-highlight {
    padding: 30px 20px !important;
  }

  .warranty-badge {
    padding: 30px 20px !important;
  }

  .warranty-badge h2 {
    font-size: 2rem !important;
  }

  .section-title h2 {
    font-size: 2rem !important;
  }

  .contact-info {
    gap: 20px;
  }

  .service-detail {
    margin-bottom: 40px;
  }
  
  .map-container {
    height: 300px !important;
    margin-top: 30px !important;
  }
  
  .form-group input,
  .form-group textarea {
    font-size: 16px !important; /* Prevents zoom on iOS */
    padding: 12px !important;
  }
  
  .form-group label {
    font-size: 0.95rem;
    margin-bottom: 6px;
  }
  
  .contact-form h2 {
    font-size: 1.75rem !important;
    margin-bottom: 8px !important;
  }
  
  .contact-form > p {
    font-size: 0.95rem;
    margin-bottom: 20px !important;
  }
  
  .contact-card {
    padding: 20px !important;
  }
  
  .map-section {
    order: -1; /* Show map first on mobile */
  }
  
  .office-hours-card {
    padding: 20px !important;
  }
  
  .office-hours-card h4 {
    font-size: 1.1rem;
  }
  
  .office-hours-card p {
    font-size: 0.9rem;
    line-height: 1.6;
  }
  
  .btn {
    padding: 12px 25px !important;
    font-size: 0.9rem !important;
  }
  
  .alert {
    padding: 12px 15px !important;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .contact-form {
    padding: 20px 15px !important;
  }
  
  .map-container {
    height: 250px !important;
    border-radius: 10px;
  }
  
  .contact-form h2 {
    font-size: 1.5rem !important;
  }
  
  .form-group input,
  .form-group textarea {
    padding: 10px !important;
  }
  
  .btn {
    padding: 12px 20px !important;
    font-size: 0.85rem !important;
  }
  
  .office-hours-card {
    padding: 15px !important;
  }
  
  .contact-card {
    padding: 15px !important;
  }
  
  .contact-card-icon {
    width: 60px !important;
    height: 60px !important;
    font-size: 1.5rem !important;
  }
  
  .contact-info {
    gap: 15px;
  }
  
  .section {
    padding: 40px 0 !important;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .section {
    padding: 40px 0;
  }

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

  .subsidy-highlight,
  .warranty-badge {
    padding: 30px 20px;
  }

  .service-content {
    padding: 25px;
  }

  .contact-form {
    padding: 25px;
  }
}

/* === Grid Layout Utilities === */
.row {
  display: grid;
  gap: 30px;
}

@media (min-width: 768px) {
  .row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .row {
    grid-template-columns: 1fr;
  }
}

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

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* === Image Gallery === */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 15px;
  box-shadow: var(--shadow);
  aspect-ratio: 4 / 3;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-item::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 166, 81, 0.3), rgba(30, 132, 73, 0.3));
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover::after {
  opacity: 1;
}

/* === Service Image Container === */
.service-image {
  width: 100%;
  height: 300px;
  overflow: hidden;
  border-radius: 15px;
  margin-bottom: 30px;
  box-shadow: var(--shadow);
}

.service-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* === Animation Utilities === */
.fade-in {
  opacity: 0;
  animation: fadeIn 1s ease-in forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}