/* ==========================================================================
   Physik Design System — Official Stylesheet
   Lab White (#FFFFFF) | Platinum (#F3F4F6) | Carbon (#111827) | Infrared (#EF3340)
   ========================================================================== */

:root {
  /* Core Color Palette */
  --lab-white: #ffffff;
  --platinum: #f3f4f6;
  --platinum-dark: #e5e7eb;
  --carbon: #111827;
  --carbon-light: #1f2937;
  --carbon-muted: #4b5563;
  --carbon-subtle: #9ca3af;
  --infrared: #ef3340;
  --infrared-hover: #d92532;
  --infrared-subtle: rgba(239, 51, 64, 0.08);
  --infrared-border: rgba(239, 51, 64, 0.25);

  /* Typography */
  --font-brand: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-data: 'Roboto Mono', SFMono-Regular, Consolas, monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout & Curves */
  --radius-sm: 2px;
  --radius-md: 4px; /* Essential Physik subtle curve aesthetic */
  --radius-lg: 8px;
  --border-carbon: 1px solid var(--carbon);
  --border-platinum: 1px solid var(--platinum-dark);

  /* Fluid Motion & Haptics Simulation */
  --ease-mechanical: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 120ms var(--ease-mechanical);
  --transition-smooth: 220ms var(--ease-mechanical);

  /* Shadows & Depth (Minimalist / Flat focus) */
  --shadow-flat: 0 1px 3px rgba(17, 24, 39, 0.05);
  --shadow-haptic: 0 2px 0 var(--carbon);
  --shadow-infrared: 0 4px 14px rgba(239, 51, 64, 0.25);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--lab-white);
  color: var(--carbon);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  background: var(--lab-white);
  line-height: 1.5;
}

/* Typography Standards */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--carbon);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p {
  color: var(--carbon-muted);
  font-size: 1rem;
  line-height: 1.6;
}

.data-mono {
  font-family: var(--font-data);
}

.brand-text {
  font-family: var(--font-brand);
}

/* Global Container & Grid System */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Buttons & Tactile UI Switches */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.925rem;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn-carbon {
  background-color: var(--carbon);
  color: var(--lab-white);
  border-color: var(--carbon);
}
.btn-carbon:hover {
  background-color: var(--carbon-light);
  transform: translateY(-1px);
}
.btn-carbon:active {
  transform: translateY(1px);
}

.btn-infrared {
  background-color: var(--infrared);
  color: var(--lab-white);
  border-color: var(--infrared);
  box-shadow: var(--shadow-infrared);
}
.btn-infrared:hover {
  background-color: var(--infrared-hover);
  transform: translateY(-1px);
}
.btn-infrared:active {
  transform: translateY(1px);
  box-shadow: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--carbon);
  border: var(--border-carbon);
}
.btn-outline:hover {
  background-color: var(--platinum);
}

.btn-sm {
  padding: 0.5rem 0.85rem;
  font-size: 0.825rem;
}

/* Mechanical Haptic Switch Animation */
.mechanical-switch {
  position: relative;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}
.mechanical-switch:active {
  transform: scale(0.97);
}

/* Clinical Badge & Tag System */
.clinical-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--platinum);
  color: var(--carbon);
  border: 1px solid var(--platinum-dark);
}

.clinical-badge-infrared {
  background-color: var(--infrared-subtle);
  color: var(--infrared);
  border-color: var(--infrared-border);
}

/* Card Component (Subtle Curve Aesthetic) */
.card-platinum {
  background-color: var(--platinum);
  border-radius: var(--radius-md);
  border: 1px solid var(--platinum-dark);
  padding: 2rem;
  transition: border-color var(--transition-smooth);
}

.card-lab {
  background-color: var(--lab-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--platinum-dark);
  padding: 2rem;
  box-shadow: var(--shadow-flat);
}

.card-carbon {
  background-color: var(--carbon);
  color: var(--lab-white);
  border-radius: var(--radius-md);
  padding: 2rem;
}

/* Header & Glassmorphic Navigation */
.navbar-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(17, 24, 39, 0.08);
  height: 72px;
  display: flex;
  align-items: center;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.925rem;
  color: var(--carbon);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}
.nav-link:hover {
  color: var(--infrared);
}

/* Section Header Styles */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem auto;
}
.section-title {
  font-size: 2.5rem;
  margin-top: 0.75rem;
  margin-bottom: 1rem;
}
.section-subtitle {
  font-size: 1.125rem;
}

/* Section Padding */
.section-padding {
  padding: 6.5rem 0;
}

/* Diagnostic Monospaced Data Grid */
.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.data-cell {
  background-color: var(--lab-white);
  border: 1px solid var(--platinum-dark);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-data);
}
.data-cell-label {
  font-size: 0.75rem;
  color: var(--carbon-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}
.data-cell-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--carbon);
}
.data-cell-value.infrared {
  color: var(--infrared);
}

/* CAD Line Art Blueprint Grid Background */
.bg-blueprint {
  background-image: 
    linear-gradient(to right, rgba(17, 24, 39, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(17, 24, 39, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--platinum);
}
::-webkit-scrollbar-thumb {
  background: var(--carbon-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--carbon);
}

/* Mobile Responsive */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
  .section-title {
    font-size: 2rem;
  }
  .section-padding {
    padding: 4.5rem 0;
  }
}