@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Palette - Clean White B2B Theme */
  --bg-main: #FFFFFF;
  --bg-section-alt: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-hover: #F1F5F9;
  --bg-header: #F8FAFC;
  --bg-input: #FFFFFF;
  --bg-accent-subtle: #F0F9FF;

  --border-color: #E2E8F0;
  --border-active: #0284C7;

  --primary: #0284C7;
  --primary-hover: #0369A1;
  --primary-dark: #075985;

  --emerald: #059669;
  --emerald-subtle: #ECFDF5;
  
  --amber: #D97706;
  --rose: #DC2626;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #64748B;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 10px 30px -5px rgba(15, 23, 42, 0.08);
  --shadow-popover: 0 20px 25px -5px rgba(15, 23, 42, 0.1);
}

/* Reset & Global */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-secondary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 92%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Typography Helpers */
.text-highlight {
  color: var(--primary);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

.badge-primary {
  background: var(--bg-accent-subtle);
  border: 1px solid #BAE6FD;
  color: var(--primary-hover);
}

.badge-success {
  background: var(--emerald-subtle);
  border: 1px solid #A7F3D0;
  color: var(--emerald);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.9rem 0;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text-primary);
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.btn-secondary {
  background-color: #FFFFFF;
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  border-color: #CBD5E1;
}

/* Hero Section */
.hero {
  padding: 9rem 0 5rem 0;
  background: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  margin: 1.25rem 0;
  color: var(--text-primary);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-metrics-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.metric-item .val {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.metric-item .lbl {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 0.2rem;
}

.hero-preview-frame {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-preview-frame img {
  width: 100%;
  height: auto;
  display: block;
}

/* Section Common Header */
.section-head {
  max-width: 680px;
  margin: 0 auto 3.5rem auto;
  text-align: center;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary);
  margin-bottom: 0.5rem;
  display: block;
}

.section-head h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

/* Dashboard SaaS Simulator */
.dashboard-section {
  padding: 6rem 0;
  background: var(--bg-section-alt);
  border-bottom: 1px solid var(--border-color);
}

.app-window {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.app-header {
  background: #F8FAFC;
  padding: 0.9rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-title-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.device-id {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  background: #E2E8F0;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.app-body {
  display: grid;
  grid-template-columns: 240px 1fr 300px;
  min-height: 480px;
}

/* Sidebar Assets */
.asset-sidebar {
  background: #F8FAFC;
  border-right: 1px solid var(--border-color);
  padding: 1.25rem 1rem;
}

.sidebar-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
  margin-bottom: 0.85rem;
}

.asset-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.asset-item {
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.15s ease;
}

.asset-item.active {
  background: #FFFFFF;
  color: var(--text-primary);
  font-weight: 600;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--primary);
}

.asset-item:hover:not(.active) {
  background: #F1F5F9;
  color: var(--text-primary);
}

/* Main Dashboard Canvas */
.dash-canvas {
  padding: 1.75rem;
  background: #FFFFFF;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.kpi-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.kpi-box {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem;
}

.kpi-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-tertiary);
  margin-bottom: 0.4rem;
  display: flex;
  justify-content: space-between;
}

.kpi-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Tank Visualization Realism */
.tank-block {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.tank-gauge-container {
  width: 140px;
  height: 180px;
  border: 2px solid #CBD5E1;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  background: #FFFFFF;
}

.tank-water-level {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 78%;
  background: linear-gradient(180deg, #38BDF8 0%, #0284C7 100%);
  transition: height 0.5s ease;
}

.tank-specs {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Event Logs Sidebar */
.event-log-panel {
  background: #F8FAFC;
  border-left: 1px solid var(--border-color);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}

.log-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
  font-size: 0.8rem;
  overflow-y: auto;
  max-height: 380px;
}

.log-entry {
  padding: 0.6rem 0.8rem;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  box-shadow: var(--shadow-sm);
}

.log-time {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

/* Tabs Solutions Section */
.tabs-section {
  padding: 6rem 0;
  background: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
}

.tabs-nav {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.7rem 1.35rem;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.tab-btn:hover:not(.active) {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.tab-text h3 {
  font-size: 1.8rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.tab-text p {
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.tab-img-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.tab-img-card img {
  width: 100%;
  height: auto;
  display: block;
}

/* Technical Specs Table Section */
.specs-section {
  padding: 6rem 0;
  background: var(--bg-section-alt);
  border-bottom: 1px solid var(--border-color);
}

.specs-table-wrapper {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

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

.specs-table th {
  background: #F1F5F9;
  padding: 1rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

.specs-table td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

.specs-table tr:hover td {
  background: #F8FAFC;
}

/* Calculator Card */
.calc-section {
  padding: 6rem 0;
  background: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
}

.calc-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  box-shadow: var(--shadow-card);
}

.slider-group {
  margin-bottom: 2rem;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.calc-slider {
  width: 100%;
  accent-color: var(--primary);
  height: 6px;
  background: #E2E8F0;
  border-radius: 3px;
}

.calc-result-box {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.calc-big-num {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  color: var(--emerald);
  margin: 0.5rem 0;
}

/* Contact Form B2B */
.contact-section {
  padding: 6rem 0;
  background: var(--bg-section-alt);
}

.contact-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  max-width: 760px;
  margin: 0 auto;
  box-shadow: var(--shadow-card);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group.full {
  grid-column: span 2;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input {
  padding: 0.85rem 1rem;
  background: var(--bg-input);
  border: 1px solid #CBD5E1;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

/* Footer B2B Light */
.footer {
  padding: 4rem 0 2rem 0;
  border-top: 1px solid var(--border-color);
  background: #F8FAFC;
  font-size: 0.85rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--primary);
}

/* Toast */
.toast-area {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast-msg {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  padding: 0.9rem 1.35rem;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-popover);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-grid, .app-body, .tab-content.active, .calc-card {
    grid-template-columns: 1fr;
  }
  .app-body {
    min-height: auto;
  }
  .asset-sidebar, .event-log-panel {
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--border-color);
  }
}