/* ==========================================================================
   Flexibil Rubber-Rec Engineering Dashboard
   Dark engineering theme with vibrant accent colors
   ========================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2235;
  --bg-card-hover: #1f2a40;
  --border: #2d3a52;
  --border-accent: #3b4d6e;
  --text-primary: #e8ecf4;
  --text-secondary: #8b9dc3;
  --text-muted: #5a6f96;
  --accent-blue: #0066CC;
  --accent-blue-light: #3399FF;
  --accent-orange: #FF6600;
  --accent-orange-light: #FF8833;
  --accent-green: #2D5A27;
  --accent-green-light: #4CAF50;
  --accent-red: #DC3545;
  --accent-cyan: #00BCD4;
  --accent-purple: #9C27B0;
  --accent-yellow: #FFC107;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.5);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}
.nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}
.nav-brand .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-orange));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
}
.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}
.nav-links a.active {
  color: var(--accent-blue-light);
  background: rgba(0, 102, 204, 0.12);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --- Layout --- */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 4rem 0;
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 700px;
}

.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

/* --- Hero --- */
.hero {
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0,102,204,0.08), transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(255,102,0,0.05), transparent 60%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.hero h1 span { color: var(--accent-blue-light); }
.hero .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 520px;
}

/* --- Mount Cross-Section SVG --- */
.mount-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.mount-visual svg {
  width: 100%;
  max-width: 500px;
  height: auto;
}

/* --- Stat Cards --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}
.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-blue-light);
}
.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 4px;
}
.stat-card.orange .stat-value { color: var(--accent-orange); }
.stat-card.green .stat-value { color: var(--accent-green-light); }
.stat-card.cyan .stat-value { color: var(--accent-cyan); }

/* --- Cards Grid --- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.25s;
  cursor: default;
}
.card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1rem;
}
.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.card-icon.military { background: rgba(45,90,39,0.3); border: 1px solid var(--accent-green); }
.card-icon.commercial { background: rgba(0,102,204,0.2); border: 1px solid var(--accent-blue); }
.card-icon.civilian { background: rgba(255,102,0,0.15); border: 1px solid var(--accent-orange); }
.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.card .card-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Badge / Tag --- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge.military { background: rgba(45,90,39,0.3); color: var(--accent-green-light); border: 1px solid var(--accent-green); }
.badge.commercial { background: rgba(0,102,204,0.15); color: var(--accent-blue-light); border: 1px solid var(--accent-blue); }
.badge.civilian { background: rgba(255,102,0,0.12); color: var(--accent-orange-light); border: 1px solid var(--accent-orange); }
.badge.pass { background: rgba(76,175,80,0.15); color: var(--accent-green-light); }
.badge.fail { background: rgba(220,53,69,0.15); color: var(--accent-red); }
.badge.marginal { background: rgba(255,193,7,0.15); color: var(--accent-yellow); }

/* --- Tables --- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
th {
  background: rgba(0,0,0,0.3);
  padding: 12px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  position: sticky;
  top: 0;
}
td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(45,58,82,0.5);
  color: var(--text-primary);
  vertical-align: top;
}
tr:hover td {
  background: rgba(255,255,255,0.02);
}
td.mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* --- Filters --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 1.5rem;
  align-items: center;
}
.filter-bar label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.filter-bar select,
.filter-bar input[type="range"],
.filter-bar input[type="number"] {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-family: var(--font-sans);
}
.filter-bar select:focus,
.filter-bar input:focus {
  outline: none;
  border-color: var(--accent-blue);
}
.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.range-display {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-blue-light);
  min-width: 30px;
}

/* --- Detail Panel --- */
.detail-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 1.5rem;
}
.detail-panel h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.detail-block h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
.detail-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 0.85rem;
}
.detail-row .label {
  color: var(--text-secondary);
}
.detail-row .value {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 500;
}

/* --- Chart Container --- */
.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.chart-container h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.chart-svg {
  width: 100%;
  overflow: visible;
}

/* --- D3 Chart Styles --- */
.axis text {
  fill: var(--text-secondary);
  font-size: 11px;
  font-family: var(--font-sans);
}
.axis line,
.axis path {
  stroke: var(--border);
}
.grid line {
  stroke: var(--border);
  stroke-opacity: 0.4;
}
.grid path {
  stroke-width: 0;
}

/* --- Calculator --- */
.calc-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.5rem;
}
.calc-inputs {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.calc-inputs h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
}
.input-group {
  margin-bottom: 1rem;
}
.input-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
}
.input-group input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: var(--font-mono);
}
.input-group input:focus {
  outline: none;
  border-color: var(--accent-blue);
}
.input-group .unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.calc-btn {
  width: 100%;
  padding: 10px;
  background: var(--accent-blue);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 0.5rem;
}
.calc-btn:hover {
  background: var(--accent-blue-light);
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.result-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}
.result-box .r-value {
  font-size: 1.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-blue-light);
}
.result-box .r-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}
.result-box.good .r-value { color: var(--accent-green-light); }
.result-box.warn .r-value { color: var(--accent-yellow); }
.result-box.bad .r-value { color: var(--accent-red); }

/* --- Process Flow --- */
.process-flow {
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding: 1rem 0;
}
.process-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  min-width: 200px;
  flex: 1;
  position: relative;
  text-align: center;
}
.process-step:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 12px solid var(--border-accent);
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  z-index: 1;
}
.process-step .step-num {
  font-size: 0.7rem;
  color: var(--accent-blue-light);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}
.process-step h4 {
  font-size: 0.9rem;
  margin-bottom: 6px;
}
.process-step p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- Checklist --- */
.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(45,58,82,0.3);
}
.checklist-icon {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.checklist-icon.yes { background: rgba(76,175,80,0.2); color: var(--accent-green-light); }
.checklist-icon.no { background: rgba(220,53,69,0.15); color: var(--accent-red); }
.checklist-icon.partial { background: rgba(255,193,7,0.15); color: var(--accent-yellow); }

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
  overflow-x: auto;
}
.tab-btn {
  padding: 10px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  font-family: var(--font-sans);
}
.tab-btn:hover {
  color: var(--text-primary);
}
.tab-btn.active {
  color: var(--accent-blue-light);
  border-bottom-color: var(--accent-blue);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* --- Footer --- */
.footer {
  padding: 2rem;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}
.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-brand {
  font-weight: 700;
  font-size: 0.9rem;
}
.footer-standards {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-standards .std-tag {
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-family: var(--font-mono);
}
.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero-content { grid-template-columns: 1fr; }
  .mount-visual { display: none; }
  .calc-layout { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }
  .hero h1 { font-size: 2rem; }
  .cards-grid { grid-template-columns: 1fr; }
  .process-flow { flex-direction: column; }
  .process-step:not(:last-child)::after { display: none; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-accent); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* --- Radar chart --- */
.radar-labels text {
  fill: var(--text-secondary);
  font-size: 11px;
}

/* --- Tooltip --- */
.tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(10,14,23,0.95);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 0.8rem;
  color: var(--text-primary);
  z-index: 999;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}
.tooltip .tt-label {
  color: var(--text-muted);
  font-size: 0.7rem;
}
.tooltip .tt-value {
  font-family: var(--font-mono);
  font-weight: 600;
}

/* --- Compound recipe bar --- */
.recipe-bar {
  display: flex;
  height: 24px;
  border-radius: 4px;
  overflow: hidden;
  margin: 8px 0;
}
.recipe-bar .seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  min-width: 2px;
}

/* --- Loading --- */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  color: var(--text-muted);
}

/* Link cards */
a.card {
  text-decoration: none;
  color: inherit;
}