/* ==========================================================================
   AQUACHEM DESIGN SYSTEM & STYLESHEET
   Core Styling for Aquachem Engineering Website & Web-Tools
   ========================================================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Brand Colors */
  --color-brand-primary-deep: #002060;      /* Deep Blue */
  --color-brand-primary-mid: #00529F;       /* Mid Blue */
  --color-brand-accent-aqua: #00A8C1;       /* Aqua */
  --color-brand-accent-green: #00A651;      /* Green */
  --color-brand-accent-purple: #6A1B9A;     /* Purple */
  --color-brand-accent-amber: #F57F17;      /* Amber */
  --color-brand-accent-teal: #00695C;       /* Teal */

  /* Neutral Theme Colors (sleek dark mode by default for premium tech feel) */
  --color-bg-page: #0b0f19;
  --color-bg-panel: #131b2e;
  --color-bg-card: #1b2640;
  --color-bg-card-hover: #223054;
  --color-border-light: rgba(255, 255, 255, 0.08);
  --color-border-medium: rgba(255, 255, 255, 0.15);
  
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-inverse: #ffffff;
  --color-text-accent: #00A8C1;
  --color-text-link: #38bdf8;
  --color-text-link-hover: #00A8C1;

  --color-status-success: #10b981;
  --color-status-warning: #f59e0b;
  --color-status-error: #ef4444;

  /* Typography */
  --font-family-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Spacing Scale (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  /* Layout Constants */
  --container-max: 1280px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Shadows & Glassmorphism */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 15px 30px rgba(0, 168, 193, 0.15);
  --glass-bg: rgba(19, 27, 46, 0.7);
  --glass-border: rgba(255, 255, 255, 0.05);
  --glass-blur: blur(12px);

  /* Animations */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Overrides (Optional Class) */
body.light-theme {
  --color-bg-page: #f1f5f9;
  --color-bg-panel: #ffffff;
  --color-bg-card: #ffffff;
  --color-bg-card-hover: #f8fafc;
  --color-border-light: #e2e8f0;
  --color-border-medium: #cbd5e1;
  
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-inverse: #ffffff;
  --color-text-accent: #00529F;
  --color-text-link: #00529F;
  --color-text-link-hover: #002060;

  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 25px -5px rgba(0, 82, 159, 0.08);
}

/* Light Theme Component Overrides */
body.light-theme .hero-section {
  background: radial-gradient(circle at 80% 20%, rgba(0, 168, 193, 0.12) 0%, transparent 60%),
              radial-gradient(circle at 10% 80%, rgba(0, 82, 159, 0.08) 0%, transparent 50%);
}

body.light-theme .infographic-container {
  background-color: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .chart-container {
  background-color: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
}

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

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

body {
  font-family: var(--font-family-body);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-page);
}
::-webkit-scrollbar-thumb {
  background: var(--color-bg-card-hover);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-brand-accent-aqua);
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-4);
  padding-left: var(--space-4);
}

/* Typography & Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text-primary);
}

h1 { font-size: 2.5rem; letter-spacing: -0.025em; }
h2 { font-size: 1.75rem; letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; }
p { color: var(--color-text-secondary); margin-bottom: var(--space-3); }

/* Anchor Tags */
a {
  color: var(--color-text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-text-link-hover);
}

/* ==========================================================================
   NAVIGATION BAR
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-3) 0;
  transition: background-color var(--transition-normal);
}

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

.logo-block {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo-block img {
  height: 40px;
  width: auto;
}

.logo-block h1 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-text-inverse) 30%, var(--color-brand-accent-aqua));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-block span {
  font-size: 0.75rem;
  font-family: var(--font-family-mono);
  color: var(--color-brand-accent-aqua);
  border: 1px solid var(--color-brand-accent-aqua);
  padding: 1px 4px;
  border-radius: var(--radius-sm);
  margin-left: 4px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-2);
}

.nav-item a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.nav-item a:hover, .nav-item.active a {
  color: var(--color-text-inverse);
  background-color: var(--color-bg-card);
}

.nav-item.active a {
  border-bottom: 2px solid var(--color-brand-accent-aqua);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}
.theme-toggle-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-brand-accent-aqua);
}

/* Hamburger menu for mobile */
.nav-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--color-text-primary);
  cursor: pointer;
}

/* ==========================================================================
   PAGE HERO SECTIONS
   ========================================================================== */
.hero-section {
  position: relative;
  padding: var(--space-8) 0 var(--space-7) 0;
  margin-top: 60px;
  background: radial-gradient(circle at 80% 20%, rgba(0, 168, 193, 0.1) 0%, transparent 60%),
              radial-gradient(circle at 10% 80%, rgba(0, 82, 159, 0.08) 0%, transparent 50%);
  border-bottom: 1px solid var(--color-border-light);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-6);
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(0, 168, 193, 0.1);
  border: 1px solid rgba(0, 168, 193, 0.3);
  color: var(--color-brand-accent-aqua);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--color-text-inverse) 60%, var(--color-brand-accent-aqua));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
}

.hero-graphics-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-mockup-frame {
  position: relative;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.hero-mockup-frame::after {
  content: '';
  position: absolute;
  top: -10px;
  right: -10px;
  width: 60px;
  height: 60px;
  background: radial-gradient(var(--color-brand-accent-aqua) 0%, transparent 70%);
  opacity: 0.3;
  z-index: -1;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family-body);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-brand-primary-mid);
  color: var(--color-text-inverse);
  border-color: var(--color-brand-primary-mid);
}
.btn-primary:hover {
  background-color: var(--color-brand-primary-deep);
  border-color: var(--color-brand-primary-deep);
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

.btn-accent {
  background-color: var(--color-brand-accent-aqua);
  color: var(--color-text-inverse);
  border-color: var(--color-brand-accent-aqua);
}
.btn-accent:hover {
  background-color: #008bae;
  border-color: #008bae;
  box-shadow: 0 8px 20px rgba(0, 168, 193, 0.25);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-medium);
}
.btn-outline:hover {
  background-color: var(--color-bg-card);
  border-color: var(--color-brand-accent-aqua);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-link);
  padding: 8px 16px;
}
.btn-ghost:hover {
  background-color: var(--color-bg-card);
  color: var(--color-text-inverse);
}

/* ==========================================================================
   SECTIONS & MAIN LAYOUT
   ========================================================================== */
.section {
  padding: var(--space-7) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.section-alt {
  background-color: var(--color-bg-panel);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.section-header p {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
}

.section-accent-line {
  width: 60px;
  height: 4px;
  background-color: var(--color-brand-accent-aqua);
  margin: var(--space-2) auto 0 auto;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   CARDS & GRIDS
   ========================================================================== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

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

/* Product Cards & Info Cards */
.card {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-brand-accent-aqua);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: rgba(0, 168, 193, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.card-icon img, .card-icon svg {
  width: 28px;
  height: 28px;
  fill: var(--color-brand-accent-aqua);
}

.card h3 {
  margin-bottom: var(--space-2);
}

/* Product Card Spec Layout */
.product-card {
  position: relative;
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
}

.product-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--card-accent-color, var(--color-brand-primary-mid));
}

.product-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-2);
}

.product-category {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.product-spec-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  margin: var(--space-3) 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.product-spec-table td {
  padding: 4px 0;
  color: var(--color-text-secondary);
}

.product-spec-table td:last-child {
  text-align: right;
  color: var(--color-text-primary);
  font-weight: 500;
}

.product-benefit {
  font-size: 0.88rem;
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

.product-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: auto;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.badge-aqua { background: rgba(0,168,193,0.15); color: var(--color-brand-accent-aqua); }
.badge-green { background: rgba(0,166,81,0.15); color: var(--color-brand-accent-green); }
.badge-purple { background: rgba(106,27,154,0.15); color: var(--color-brand-accent-purple); }
.badge-amber { background: rgba(245,127,23,0.15); color: var(--color-brand-accent-amber); }

/* ==========================================================================
   PROGRAM SELECTOR TABS
   ========================================================================== */
.tabs-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.tabs-header {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
}

.tab-btn {
  background: transparent;
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-page);
}

.tab-btn.active {
  color: var(--color-text-inverse);
  background-color: var(--tab-accent-color, var(--color-brand-primary-mid));
}

.tab-content {
  display: block;
  animation: fadeIn 250ms ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Specialty category column styling */
.subcategory-header {
  grid-column: 1 / -1;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-brand-accent-aqua);
  border-bottom: 2px solid var(--color-border-light);
  padding-bottom: var(--space-1);
  margin-top: var(--space-3);
  margin-bottom: var(--space-1);
}

/* ==========================================================================
   TABLES
   ========================================================================== */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  margin: var(--space-4) 0;
  box-shadow: var(--shadow-sm);
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.table th {
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  font-weight: 600;
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border-medium);
}

.table td {
  padding: var(--space-3);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
}

.table tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background-color: var(--color-bg-card);
}

.table tbody tr.highlight-row {
  background-color: rgba(0, 168, 193, 0.05);
}

/* ==========================================================================
   INTERACTIVE TOOLS (CALCULATORS)
   ========================================================================== */
.tools-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-6);
}

.calculator-card {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
}

.calculator-results {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  box-shadow: var(--shadow-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.form-group label span {
  font-weight: 400;
  color: var(--color-text-secondary);
  font-size: 0.78rem;
}

.form-control {
  font-family: inherit;
  font-size: 0.95rem;
  background-color: var(--color-bg-page);
  border: 1px solid var(--color-border-light);
  color: var(--color-text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-brand-accent-aqua);
  box-shadow: 0 0 0 2px rgba(0, 168, 193, 0.2);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

/* Piper Plotter grid spacing */
.chemical-inputs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.chem-group {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.chem-group h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
  color: var(--color-brand-accent-aqua);
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: var(--space-1);
}

/* Piper Diagram SVG Plotting */
.piper-plot-area {
  width: 100%;
  aspect-ratio: 1.15;
  background-color: #ffffff; /* Piper needs light background for drawing colors */
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-2);
}

.piper-svg {
  width: 100%;
  height: 100%;
  max-width: 480px;
}

.calculator-results .diagnosis-box {
  background-color: var(--color-bg-page);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  position: relative;
}

.diagnosis-box::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  background-color: var(--status-color, var(--color-status-success));
}

.diagnosis-box h4 {
  font-size: 1.1rem;
  margin-bottom: var(--space-2);
}

.diagnosis-box p {
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* WQI Indicator bar */
.wqi-meter-container {
  width: 100%;
  height: 24px;
  background-color: var(--color-bg-page);
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--color-border-light);
  margin: var(--space-2) 0;
}

.wqi-meter-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(to right, #10b981 0%, #f59e0b 50%, #ef4444 100%);
  transition: width var(--transition-normal);
}

.wqi-marker {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--color-text-inverse);
  box-shadow: 0 0 4px rgba(0,0,0,0.5);
  transition: left var(--transition-normal);
}

/* ==========================================================================
   AQUAMONITOR™ IOT SIMULATOR
   ========================================================================== */
.iot-dashboard-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-5);
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.iot-sidebar {
  border-right: 1px solid var(--color-border-light);
  padding-right: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.sensor-toggle-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sensor-toggle-item:hover {
  border-color: var(--color-brand-accent-aqua);
}

.sensor-toggle-item.active {
  background-color: rgba(0, 168, 193, 0.08);
  border-color: var(--color-brand-accent-aqua);
}

.sensor-info {
  display: flex;
  flex-direction: column;
}

.sensor-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.sensor-value-small {
  font-size: 0.8rem;
  font-family: var(--font-family-mono);
  color: var(--color-brand-accent-aqua);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-status-success);
}
.status-dot.warning { background-color: var(--color-status-warning); }
.status-dot.danger { background-color: var(--color-status-error); }

.iot-main-view {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.iot-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}

.iot-metric-tile {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  text-align: center;
}

.iot-tile-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.iot-tile-value {
  font-size: 1.5rem;
  font-weight: 800;
  font-family: var(--font-family-mono);
  color: var(--color-text-primary);
}

.iot-tile-unit {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.iot-chart-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  height: 220px;
  display: flex;
  flex-direction: column;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.chart-container {
  flex-grow: 1;
  position: relative;
}

.chart-svg {
  width: 100%;
  height: 100%;
}

.iot-alerts-panel {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.iot-alert-actions {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.iot-alerts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 120px;
  overflow-y: auto;
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
}

.iot-alert-item {
  display: flex;
  justify-content: space-between;
  padding: 6px var(--space-2);
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.02);
  border-left: 3px solid var(--color-status-success);
}

.iot-alert-item.alert-danger {
  border-left-color: var(--color-status-error);
  background-color: rgba(239, 68, 68, 0.05);
}

.iot-alert-item.alert-warning {
  border-left-color: var(--color-status-warning);
  background-color: rgba(245, 158, 11, 0.05);
}

/* ==========================================================================
   CASE STUDIES & TESTIMONIALS
   ========================================================================== */
.case-studies-carousel {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.case-slide {
  display: none;
  animation: slideFade 300ms ease-out;
}

.case-slide.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

@keyframes slideFade {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.case-info-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.case-results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.case-kpi-badge {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  text-align: center;
}

.case-kpi-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-brand-accent-green);
}

.case-kpi-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.case-quote {
  font-style: italic;
  border-left: 3px solid var(--color-brand-accent-aqua);
  padding-left: var(--space-3);
  margin-top: var(--space-3);
  color: var(--color-text-secondary);
}

.carousel-nav {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.carousel-btn {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  color: var(--color-text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.carousel-btn:hover {
  background-color: var(--color-brand-accent-aqua);
  color: var(--color-text-inverse);
  border-color: var(--color-brand-accent-aqua);
}

/* ==========================================================================
   RESOURCES & TROUBLESHOOTING
   ========================================================================== */
.wizard-box {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
  max-width: 680px;
  margin: 0 auto;
}

.wizard-step {
  display: none;
  animation: fadeIn var(--transition-normal);
}

.wizard-step.active {
  display: block;
}

.wizard-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: var(--space-4) 0;
}

.wizard-option-btn {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  color: var(--color-text-primary);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.wizard-option-btn:hover {
  border-color: var(--color-brand-accent-aqua);
  background-color: var(--color-bg-card-hover);
}

.wizard-actions {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-4);
}

.wizard-result-box {
  background-color: rgba(0, 166, 81, 0.05);
  border: 1px solid var(--color-brand-accent-green);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
}

/* ==========================================================================
   DOWNLOAD CENTER
   ========================================================================== */
.download-card {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-6);
  background: linear-gradient(135deg, var(--color-bg-panel) 30%, rgba(0, 82, 159, 0.15) 100%);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  align-items: center;
}

.download-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.download-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.brochure-preview-3d {
  width: 160px;
  height: 220px;
  background-color: var(--color-brand-primary-deep);
  border: 2px solid var(--color-brand-accent-aqua);
  border-radius: var(--radius-sm);
  box-shadow: -10px 10px 20px rgba(0,0,0,0.5);
  transform: perspective(600px) rotateY(-15deg) rotateX(10deg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-3);
  color: var(--color-text-inverse);
  position: relative;
}

.brochure-preview-3d::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 10px;
  background: linear-gradient(to right, rgba(0,0,0,0.3) 0%, transparent 100%);
}

.brochure-tag {
  font-size: 0.65rem;
  font-family: var(--font-family-mono);
  color: var(--color-brand-accent-aqua);
  text-transform: uppercase;
}

.brochure-title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.1;
}

.brochure-footer-text {
  font-size: 0.65rem;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   CONTACT & AUDIT REQUESTS
   ========================================================================== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-6);
}

.contact-info-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.office-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.office-card h4 {
  color: var(--color-brand-accent-aqua);
  margin-bottom: var(--space-2);
}

.office-details {
  list-style: none;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.office-details li {
  display: flex;
  gap: var(--space-2);
}

.contact-form-card {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background-color: #05080f;
  padding: var(--space-6) 0 var(--space-4) 0;
  border-top: 1px solid var(--color-border-light);
}

.footer-layout {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-5);
}

.footer-about {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links-col h4 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links-list a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.footer-links-list a:hover {
  color: var(--color-brand-accent-aqua);
  padding-left: 2px;
}

.footer-certifications-bar {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.cert-badges-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.cert-badge-item {
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  border: 1px solid var(--color-border-light);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.footer-bottom {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--space-4);
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
  h1 { font-size: 2.25rem; }
  .hero-title { font-size: 2.75rem; }
  .tools-layout, .contact-layout, .hero-layout {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
  .iot-dashboard-layout {
    grid-template-columns: 1fr;
  }
  .iot-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--color-border-light);
    padding-right: 0;
    padding-bottom: var(--space-4);
  }
  .download-card {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none; /* Mobile menu toggling would be handled via JS */
  }
  .nav-toggle {
    display: block;
  }
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .case-slide.active {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .iot-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-layout {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  .grid-3, .grid-4, .iot-metrics-grid, .form-row {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   INFOGRAPHIC STYLE LAYOUTS
   ========================================================================== */
.infographic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: start;
}

.infographic-container {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: stretch;
}

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

body:not(.light-theme) .infographic-container {
  background-color: #111827; /* Deepest dark slate for graphic contrast */
  border-color: rgba(255, 255, 255, 0.05);
}

@media (max-width: 1024px) {
  .infographic-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

/* ==========================================================================
   PRINT STYLES
   ========================================================================== */
@media print {
  body {
    background: #ffffff;
    color: #000000;
  }
  .navbar, .hero-actions, .theme-toggle-btn, .carousel-nav, .wizard-actions, .contact-form-card, .theme-toggle-btn {
    display: none !important;
  }
  .card, .calculator-card, .calculator-results, .office-card, .download-card {
    background: #ffffff !important;
    border: 1px solid #000000 !important;
    box-shadow: none !important;
    color: #000000 !important;
  }
  h1, h2, h3, p, td, th {
    color: #000000 !important;
  }
}