/* ===================================
   BlackLineSteel - Main Stylesheet
   Industrial Minimalist Design
   =================================== */

/* ============== Root & Variables ============== */
:root {
  /* Color Palette - Dark Industrial */
  --color-dark: #0f0f0f;
  --color-dark-secondary: #1a1a1a;
  --color-light: #f5f5f5;
  --color-light-secondary: #e8e8e8;
  --color-accent: #c0c0c0;
  --color-steel: #4a4a4a;
  --color-primary: #d4af37;
  
  /* Light Mode Colors */
  --color-dark-light: #f9f9f9;
  --color-light-dark: #1f1f1f;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  
  /* Typography */
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-family-heading: 'Arial', 'Helvetica', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 20px;
  --font-size-xl: 28px;
  --font-size-2xl: 36px;
  --font-size-3xl: 48px;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Border Radius */
  --border-radius-sm: 2px;
  --border-radius-md: 4px;
  --border-radius-lg: 8px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.25);
}

/* Dark Mode (Default) */
body {
  --bg-primary: var(--color-dark);
  --bg-secondary: var(--color-dark-secondary);
  --text-primary: var(--color-light);
  --text-secondary: var(--color-accent);
  --border-color: var(--color-steel);
}

/* Light Mode */
body.light-mode {
  --bg-primary: var(--color-dark-light);
  --bg-secondary: var(--color-light);
  --text-primary: var(--color-light-dark);
  --text-secondary: var(--color-steel);
  --border-color: var(--color-light-secondary);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* ============== Typography ============== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

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

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

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

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

/* ============== Header & Navigation ============== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  background-color: rgba(15, 15, 15, 0.95);
}

body.light-mode header {
  background-color: rgba(249, 249, 249, 0.95);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.05);
  color: var(--color-primary);
}

.logo-icon {
  width: 24px;
  height: 24px;
  display: inline-block;
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius-sm);
}

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

nav a {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: var(--spacing-xs) var(--spacing-sm);
  position: relative;
  color: var(--text-primary);
}

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

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

/* Dark/Light Mode Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-primary);
  color: var(--bg-primary);
}

/* Hamburger Menu (Mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  background: none;
  border: none;
  color: var(--text-primary);
}

.hamburger span {
  width: 25px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ============== Hero Section ============== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-secondary) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(
      0deg,
      rgba(192, 192, 192, 0.03) 0px,
      rgba(192, 192, 192, 0.03) 1px,
      transparent 1px,
      transparent 2px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(192, 192, 192, 0.03) 0px,
      rgba(192, 192, 192, 0.03) 1px,
      transparent 1px,
      transparent 2px
    );
  pointer-events: none;
  opacity: 0.5;
  animation: slideGrid 20s linear infinite;
}

@keyframes slideGrid {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(100px);
  }
}

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

.hero h1 {
  font-size: 4.5rem;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-light) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 1s ease-out;
}

.hero .tagline {
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 1s ease-out 0.2s backwards;
  font-style: italic;
  letter-spacing: 1px;
}

.hero .description {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 1s ease-out 0.4s backwards;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============== Buttons ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-primary);
  background-color: transparent;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all var(--transition-normal);
  border-radius: var(--border-radius-sm);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: var(--color-primary);
  transition: left var(--transition-normal);
  z-index: -1;
}

.btn:hover::before {
  left: 0;
}

.btn:hover {
  color: var(--bg-primary);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(212, 175, 55, 0.3);
}

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

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

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: var(--font-size-base);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============== Sections ============== */
section {
  padding: var(--spacing-xl) var(--spacing-lg);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  position: relative;
  display: inline-block;
  padding-bottom: var(--spacing-md);
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
}

.section-header p {
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: var(--spacing-md) auto 0;
}

/* ============== About Section ============== */
.about {
  background-color: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.about-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.about-text p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.value-item {
  padding: var(--spacing-md);
  border-left: 3px solid var(--color-primary);
  background-color: rgba(212, 175, 55, 0.05);
  transition: all var(--transition-normal);
}

.value-item:hover {
  background-color: rgba(212, 175, 55, 0.1);
  padding-left: var(--spacing-lg);
}

.value-item h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.about-image {
  position: relative;
  height: 400px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-steel) 0%, var(--color-dark-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-style: italic;
}

/* ============== Products/Gallery Section ============== */
.products {
  background-color: var(--bg-primary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.product-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  background-color: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  height: 350px;
}

.product-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-image {
  width: 100%;
  height: 250px;
  background: linear-gradient(135deg, var(--color-steel) 0%, var(--color-dark-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 60px;
  position: relative;
  overflow: hidden;
}

.product-image::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
  transition: all var(--transition-normal);
  pointer-events: none;
}

.product-card:hover .product-image::before {
  right: -30%;
  top: -30%;
}

.product-info {
  padding: var(--spacing-md);
  height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.product-info h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
}

.product-info p {
  font-size: var(--font-size-sm);
  margin: 0;
  flex-grow: 1;
}

/* Product Filter */
.filter-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--border-color);
  background-color: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  font-size: var(--font-size-sm);
  letter-spacing: 0.5px;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: rgba(212, 175, 55, 0.1);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 2000;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-md);
  animation: fadeIn var(--transition-normal);
}

.modal.active {
  display: flex;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal-content {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-md);
}

.modal-close:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--bg-primary);
}

.modal-image {
  width: 100%;
  height: 400px;
  background: linear-gradient(135deg, var(--color-steel) 0%, var(--color-dark-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 80px;
}

.modal-body {
  padding: var(--spacing-xl);
}

.modal-body h2 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.modal-body p {
  margin-bottom: var(--spacing-md);
}

/* ============== Configurator Section ============== */
.configurator {
  background-color: var(--bg-secondary);
}

.configurator-content {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.configurator-preview {
  width: 100%;
  height: 400px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-steel) 0%, var(--color-dark-secondary) 100%);
  font-size: 100px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.configurator-preview::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(212, 175, 55, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.configurator-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.option-group label {
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  font-size: var(--font-size-sm);
  letter-spacing: 1px;
}

.option-group select {
  padding: var(--spacing-sm);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.option-group select:hover,
.option-group select:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.option-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

.option-btn {
  padding: var(--spacing-sm);
  border: 2px solid var(--border-color);
  background-color: transparent;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
}

.option-btn:hover {
  border-color: var(--color-primary);
}

.option-btn.active {
  border-color: var(--color-primary);
  background-color: rgba(212, 175, 55, 0.2);
  color: var(--color-primary);
}

/* ============== Services Section ============== */
.services {
  background-color: var(--bg-primary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.service-card {
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  background-color: var(--bg-secondary);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.1), transparent);
  transition: left var(--transition-normal);
}

.service-card:hover::before {
  left: 100%;
}

.service-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.service-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.service-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.service-card p {
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ============== Contact Section ============== */
.contact {
  background-color: var(--bg-secondary);
}

.contact-content {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  gap: var(--spacing-md);
}

.contact-icon {
  font-size: 32px;
  color: var(--color-primary);
  min-width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-item-text h4 {
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.contact-item-text p {
  margin: 0;
  font-size: var(--font-size-sm);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea {
  padding: var(--spacing-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-status {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  text-align: center;
  display: none;
}

.form-status.success {
  background-color: rgba(76, 175, 80, 0.2);
  color: #4caf50;
  display: block;
}

.form-status.error {
  background-color: rgba(244, 67, 54, 0.2);
  color: #f44336;
  display: block;
}

/* ============== Footer ============== */
footer {
  background-color: var(--bg-dark);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-base);
}

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

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

.footer-section ul li a {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
  color: var(--color-primary);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  color: var(--color-primary);
  transition: all var(--transition-fast);
  font-size: 18px;
}

.social-link:hover {
  background-color: var(--color-primary);
  color: var(--bg-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.footer-bottom p {
  margin: 0;
}

/* ============== Utility Classes ============== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

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

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

.opacity-50 {
  opacity: 0.5;
}

/* Scroll Reveal Animation */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
}

.scroll-reveal.active {
  opacity: 1;
  transform: translateY(0);
  transition: all var(--transition-normal);
}

/* Lazy Loading */
img[loading="lazy"] {
  background-color: var(--bg-secondary);
}