/* ============================================
   DUST COLLECTION FOR BLASTING - PROFESSIONAL WEBSITE
   Industrial Engineering & Technical Authority
   ============================================ */

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

:root {
  /* Industrial Color Palette */
  --primary-dark: #1a3a52;
  --primary-blue: #2c5282;
  --accent-blue: #3182ce;
  --industrial-gray: #4a5568;
  --light-gray: #e2e8f0;
  --bg-white: #ffffff;
  --text-dark: #2d3748;
  --text-light: #718096;
  --border-gray: #cbd5e0;
  --success-green: #38a169;
  --warning-orange: #ed8936;

  /* Typography */
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --heading-font: 'Arial', sans-serif;
  --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;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Transitions */
  --transition: all 0.3s ease-in-out;
}

/* ========== GLOBAL STYLES ========== */

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--text-dark);
  background-color: var(--bg-white);
  line-height: 1.6;
}

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

a:hover {
  color: var(--primary-blue);
  text-decoration: underline;
}

button {
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-family);
}

/* ========== TYPOGRAPHY ========== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  color: var(--primary-dark);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  border-bottom: 3px solid var(--accent-blue);
  padding-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-top: var(--spacing-lg);
}

h4 {
  font-size: var(--font-size-xl);
  color: var(--primary-blue);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
  font-size: var(--font-size-base);
}

.text-light {
  color: var(--text-light);
}

.text-muted {
  color: #a0aec0;
  font-size: var(--font-size-sm);
}

/* ========== CONTAINER & LAYOUT ========== */

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

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-2xl) 0;
}

.section-dark {
  background-color: var(--primary-dark);
  color: white;
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: white;
}

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

.section-blue {
  background-color: var(--primary-blue);
  color: white;
}

.section-blue h2,
.section-blue h3,
.section-blue h4 {
  color: white;
  border-bottom-color: rgba(255, 255, 255, 0.3);
}

/* ========== NAVIGATION ========== */

nav {
  background-color: var(--primary-dark);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-blue), var(--primary-blue));
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: white;
  text-decoration: none;
}

.nav-cta {
  background-color: var(--accent-blue);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  font-weight: 600;
}

.nav-cta:hover {
  background-color: var(--primary-blue);
  color: white;
  text-decoration: none;
}

/* Mobile Navigation */
.mobile-menu-toggle {
  display: none;
  background: none;
  color: white;
  font-size: 24px;
}

/* ========== HERO SECTION ========== */

.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
  color: white;
  padding: 6rem var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(49, 130, 206, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(44, 82, 130, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero h1 {
  color: white;
  margin-bottom: var(--spacing-lg);
  font-size: clamp(2rem, 8vw, 3.5rem);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
  line-height: 1.5;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-2xl);
}

/* ========== BUTTONS ========== */

.btn {
  padding: 0.875rem 1.75rem;
  border-radius: 4px;
  font-weight: 600;
  display: inline-block;
  text-align: center;
  transition: var(--transition);
  border: 2px solid transparent;
  font-size: var(--font-size-base);
}

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

.btn-primary:hover {
  background-color: var(--primary-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(49, 130, 206, 0.3);
  text-decoration: none;
}

.btn-secondary {
  background-color: transparent;
  color: white;
  border-color: white;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.btn-outline:hover {
  background-color: var(--accent-blue);
  color: white;
  text-decoration: none;
}

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

/* ========== CARDS ========== */

.card {
  background: white;
  border-radius: 8px;
  padding: var(--spacing-lg);
  border: 1px solid var(--border-gray);
  transition: var(--transition);
  height: 100%;
}

.card:hover {
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent-blue), var(--primary-blue));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.card-title {
  color: var(--primary-dark);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-xl);
}

.card-text {
  color: var(--text-light);
  font-size: var(--font-size-base);
  line-height: 1.6;
}

/* ========== GRID ========== */

.grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ========== FEATURES SECTION ========== */

.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  margin-bottom: var(--spacing-2xl);
}

.features-content h2 {
  margin-bottom: var(--spacing-lg);
}

.feature-list {
  list-style: none;
  margin-bottom: var(--spacing-xl);
}

.feature-list li {
  padding: var(--spacing-md) 0;
  padding-left: 2.5rem;
  position: relative;
  color: var(--text-dark);
  line-height: 1.6;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--success-green);
  font-weight: 700;
  font-size: 1.25rem;
}

.features-image {
  background: linear-gradient(135deg, var(--light-gray), #f7fafc);
  border-radius: 8px;
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-light);
  font-size: var(--font-size-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  border: 2px dashed var(--border-gray);
}

/* ========== FORM STYLES ========== */

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

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

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-gray);
  border-radius: 4px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

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

/* ========== TABLE STYLES ========== */

.table-responsive {
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
}

thead {
  background-color: var(--primary-dark);
  color: white;
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-gray);
}

tbody tr:hover {
  background-color: var(--light-gray);
}

/* ========== TESTIMONIAL ========== */

.testimonial {
  background: white;
  padding: var(--spacing-xl);
  border-radius: 8px;
  border-left: 4px solid var(--accent-blue);
  margin-bottom: var(--spacing-lg);
}

.testimonial-text {
  font-style: italic;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.testimonial-author {
  font-weight: 600;
  color: var(--primary-dark);
}

.testimonial-role {
  font-size: var(--font-size-sm);
  color: var(--text-light);
}

/* ========== FOOTER ========== */

footer {
  background-color: var(--primary-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

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

.footer-section h4 {
  color: white;
  margin-bottom: var(--spacing-md);
}

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

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

.footer-section a {
  color: rgba(255, 255, 255, 0.75);
}

.footer-section a:hover {
  color: white;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-sm);
}

/* ========== BREADCRUMB ========== */

.breadcrumb {
  background-color: var(--light-gray);
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-sm);
}

.breadcrumb-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.breadcrumb-list li::after {
  content: '›';
  margin-left: var(--spacing-sm);
  color: var(--text-light);
}

.breadcrumb-list li:last-child::after {
  content: '';
  margin-left: 0;
}

/* ========== ALERTS ========== */

.alert {
  padding: var(--spacing-lg);
  border-radius: 4px;
  margin-bottom: var(--spacing-lg);
  border-left: 4px solid;
}

.alert-info {
  background-color: #ebf8ff;
  border-color: var(--accent-blue);
  color: var(--primary-dark);
}

.alert-success {
  background-color: #f0fff4;
  border-color: var(--success-green);
  color: var(--success-green);
}

.alert-warning {
  background-color: #fffaf0;
  border-color: var(--warning-orange);
  color: var(--warning-orange);
}

/* ========== TECHNICAL SPECS ========== */

.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.spec-item {
  background: var(--light-gray);
  padding: var(--spacing-lg);
  border-radius: 6px;
  text-align: center;
}

.spec-label {
  color: var(--text-light);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-sm);
}

.spec-value {
  color: var(--primary-dark);
  font-size: var(--font-size-2xl);
  font-weight: 700;
}

/* ========== SIDEBAR ========== */

.sidebar-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-xl);
}

.sidebar {
  background: var(--light-gray);
  padding: var(--spacing-lg);
  border-radius: 6px;
  height: fit-content;
  position: sticky;
  top: 100px;
}

.sidebar h4 {
  margin-bottom: var(--spacing-md);
  color: var(--primary-dark);
}

.sidebar-list {
  list-style: none;
}

.sidebar-list li {
  margin-bottom: var(--spacing-sm);
}

.sidebar-list a {
  color: var(--accent-blue);
  font-size: var(--font-size-sm);
}

/* ========== CASEDOWN STYLES ========== */

.accordion {
  margin-bottom: var(--spacing-xl);
}

.accordion-item {
  border: 1px solid var(--border-gray);
  margin-bottom: var(--spacing-md);
  border-radius: 4px;
  overflow: hidden;
}

.accordion-header {
  background-color: var(--light-gray);
  padding: var(--spacing-lg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--primary-dark);
  transition: var(--transition);
}

.accordion-header:hover {
  background-color: #d5dce2;
}

.accordion-content {
  padding: var(--spacing-lg);
  background: white;
  display: none;
  color: var(--text-dark);
}

.accordion-content.active {
  display: block;
}

.accordion-icon {
  font-size: 1.5rem;
  transition: var(--transition);
}

.accordion-icon.active {
  transform: rotate(180deg);
}

/* ========== TECHNICAL CONTENT ========== */

.technical-box {
  background: #f7fafc;
  border-left: 4px solid var(--accent-blue);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  border-radius: 4px;
}

.technical-box h4 {
  margin-top: 0;
  color: var(--primary-dark);
}

.formula {
  background: var(--light-gray);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  text-align: center;
  color: var(--text-dark);
  overflow-x: auto;
}

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

@media (max-width: 1024px) {
  .features {
    grid-template-columns: 1fr;
  }

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

  .sidebar-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .nav-links {
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

  h1 {
    font-size: var(--font-size-2xl);
  }

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

  .hero {
    padding: 3rem var(--spacing-md);
  }

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

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

  .feature-list li {
    padding-left: 2rem;
  }

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

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

@media (max-width: 480px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
  }

  h1 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

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

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

  table {
    font-size: var(--font-size-sm);
  }

  th, td {
    padding: var(--spacing-sm);
  }
}

/* ========== UTILITY CLASSES ========== */

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

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

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

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

.py-lg {
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
}

.hidden {
  display: none !important;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
}