/* ==========================================================================
   MYARTLAB STUDIO - DESIGN SYSTEM
   Modern, Artisanal 3D Design & Precision Fabrication Aesthetic
   ========================================================================== */

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

:root {
  color-scheme: dark;

  /* Surfaces - Cosmic Obsidian, Dark Gunmetal & Liquid Glass */
  --bg-primary: #06080D;
  --bg-surface: #0B0F17;
  --bg-elevated: #111724;
  --bg-subtle: #182030;
  --bg-glass: rgba(6, 8, 13, 0.85);
  --bg-glass-card: rgba(11, 15, 23, 0.74);
  --glass-bg: rgba(6, 8, 13, 0.85);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-specular: linear-gradient(180deg, rgba(255, 255, 255, 0.14) 0%, rgba(255, 255, 255, 0.02) 100%);
  --glass-glow-subtle: 0 16px 48px -8px rgba(0, 0, 0, 0.7);

  /* Optical Hairline Borders & Specular Highlights */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-strong: rgba(255, 255, 255, 0.25);
  --border-top-specular: rgba(255, 255, 255, 0.22);
  --specular-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.14);

  /* Brand Accents - Studio Electric Cyan & Artisanal Gold */
  --accent-primary: #00D2FF;
  --accent-primary-hover: #38BDF8;
  --accent-primary-subtle: rgba(0, 210, 255, 0.12);
  --accent-focus-ring: rgba(0, 210, 255, 0.45);
  --accent-on-primary: #000000;
  --accent-apple-white: #F8FAFC;
  --accent-gold: #F59E0B;
  --accent-gold-subtle: rgba(245, 158, 11, 0.14);
  --grid-pattern-dot: rgba(0, 210, 255, 0.18);
  --grid-pattern-dot-major: rgba(255, 255, 255, 0.22);
  --grid-pattern-line: rgba(0, 210, 255, 0.035);
  --grid-glow-ambient: rgba(0, 210, 255, 0.07);
  
  --accent-success: #10B981;
  --accent-success-subtle: rgba(16, 185, 129, 0.14);
  
  --accent-info: #38BDF8;

  /* Typography - Clean Precision Sans & Monospace Metrics */
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-dim: #64748B;
  --text-invert: #000000;

  --font-heading: "Space Grotesk", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Inter", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Concentric Radius Hierarchy */
  --max-width: 1240px;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 980px;
  --header-height: 56px;

  /* Spring Physics & Fluid Motion (Emil Kowalski + Apple HIG) */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);
  
  --trans-fast: 150ms var(--ease-out);
  --trans-normal: 240ms var(--ease-spring);
  --trans-smooth: 340ms var(--ease-spring);
  --trans-drawer: 380ms var(--ease-drawer);
}

/* Custom Themed Selection */
::selection {
  background: rgba(0, 210, 255, 0.3);
  color: #FFFFFF;
}

/* Custom Minimalist Studio Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: #07080B;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.16);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 210, 255, 0.4);
}
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.18) transparent;
}

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

:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--accent-primary);
  color: var(--accent-on-primary);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 700;
  z-index: 9999;
  transition: top var(--trans-fast);
}

.skip-link:focus {
  top: 16px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-x: clip;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-x: clip;
  position: relative;
  min-height: 100vh;
}

/* Fluid Media Safety & Auto-Resizing */
img, svg, video, canvas, iframe {
  max-width: 100%;
  height: auto;
}

/* Layer 1: Ambient Studio Lighting (Cosmic Obsidian + Cyber Sapphire & Violet Aurora Cones) */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 100vh;
  max-width: 1800px;
  background: 
    /* Top Focal Spotlight (Electric Cyan Volumetric Beam) */
    radial-gradient(1200px 580px at 50% -70px, rgba(0, 210, 255, 0.16), transparent 72%),
    /* Upper-Right Studio Rim (Deep Electric Violet / Indigo) */
    radial-gradient(950px 540px at 85% 15%, rgba(99, 102, 241, 0.12), transparent 70%),
    /* Mid-Left Subsurface Scatter (Emerald / Teal Precision Accent) */
    radial-gradient(850px 520px at 10% 48%, rgba(16, 185, 129, 0.07), transparent 74%),
    /* Lower-Right Deep Sapphire Horizon */
    radial-gradient(800px 480px at 88% 75%, rgba(59, 130, 246, 0.08), transparent 72%),
    /* Bottom Horizon Glow (Electric Cyan Core) */
    radial-gradient(1100px 580px at 50% 95%, rgba(0, 210, 255, 0.09), transparent 70%);
  pointer-events: none;
  z-index: -2;
}

/* Layer 2: Precision 3D Fabrication Coordinate Matrix (Cyber Sapphire & Platinum Micro-Lattice) */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background-image: 
    /* Primary Precision Cross-Point Dots (Electric Cyan 36px Matrix) */
    radial-gradient(circle at 1px 1px, var(--grid-pattern-dot) 1.2px, transparent 0),
    /* Major Calibration Coordinate Points (Diamond Platinum 72px Matrix) */
    radial-gradient(circle at 1.5px 1.5px, var(--grid-pattern-dot-major) 1.5px, transparent 0),
    /* Fine CAD Micrometer Lines (Cyan Vector Trace) */
    linear-gradient(to right, var(--grid-pattern-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-pattern-line) 1px, transparent 1px);
  background-size: 36px 36px, 72px 72px, 72px 72px, 72px 72px;
  mask-image: radial-gradient(ellipse 100% 85% at 50% 36%, black 50%, rgba(0, 0, 0, 0.4) 82%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 100% 85% at 50% 36%, black 50%, rgba(0, 0, 0, 0.4) 82%, transparent 100%);
  pointer-events: none;
  z-index: -1;
}

/* Layer 3: Interactive Smooth Cursor Ambient Light (Desktop Cyan Specular) */
.ambient-glow-follower {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(650px circle at var(--cursor-x, 50%) var(--cursor-y, 30%), rgba(0, 210, 255, 0.065), transparent 60%);
  opacity: 1;
  transition: opacity 300ms ease;
}

@media (prefers-reduced-motion: reduce) {
  .ambient-glow-follower {
    display: none;
  }
}

/* Luxury Section Separator Light Beam (Electric Cyan Specular Laser) */
.section-beam-divider {
  width: 100%;
  height: 1px;
  margin: 40px auto;
  max-width: var(--max-width, 1240px);
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.04) 15%, 
    rgba(0, 210, 255, 0.45) 50%, 
    rgba(255, 255, 255, 0.04) 85%, 
    transparent 100%
  );
  position: relative;
}

.section-beam-divider::after {
  content: '';
  position: absolute;
  top: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 140px;
  height: 5px;
  background: radial-gradient(ellipse at center, rgba(0, 210, 255, 0.85) 0%, rgba(56, 189, 248, 0) 75%);
  filter: blur(2.5px);
  opacity: 0.85;
  pointer-events: none;
}

/* Typography Hierarchy with Optical Balance & Apple Pro Tracking */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 600;
  text-wrap: balance;
}

h1 {
  letter-spacing: -0.035em;
  line-height: 1.05;
  font-weight: 700;
}

h2 {
  letter-spacing: -0.025em;
  line-height: 1.15;
}

h3 {
  letter-spacing: -0.015em;
  line-height: 1.25;
}

.apple-gradient-text {
  color: var(--text-primary);
  font-weight: 700;
  display: inline;
}

p {
  color: var(--text-secondary);
  font-weight: 400;
  text-wrap: pretty;
}

/* Tabular Numerals for Jitter-Free Pricing & Telemetry */
.mono, .price, .product-price, .cart-price, .order-total, .telemetry-metric, [data-tabular] {
  font-variant-numeric: tabular-nums;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--trans-fast);
}

button {
  font-family: var(--font-heading);
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

/* Containers with Fluid Auto-Resizing Padding */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(14px, 3.5vw, 24px);
  box-sizing: border-box;
}

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

/* Apple Hardware Pill Badges */
.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* Apple Capsule Buttons (Fluid, Tactile & Minimalist) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  min-height: 38px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: var(--radius-pill);
  transition: transform 160ms var(--ease-out), background-color 160ms var(--ease-out), border-color 160ms var(--ease-out), box-shadow 160ms var(--ease-out), color 160ms var(--ease-out);
  white-space: nowrap;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

/* Tactile press response - Apple physics scale */
.btn:active:not(:disabled),
button.admin-action-chip:active:not(:disabled),
button.auth-nav-tab:active:not(:disabled),
button.demo-order-chip:active:not(:disabled),
.user-menu-item:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--accent-on-primary);
  border: 1px solid var(--accent-primary);
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  border-color: var(--accent-primary-hover);
  color: var(--accent-on-primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--specular-highlight);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--border-strong);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-subtle {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
}

.btn-white {
  background: #F5F5F7;
  color: #000000;
  border: 1px solid #FFFFFF;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.2);
}

/* Gate hover states behind capabilities to prevent sticky hover on touch */
@media (hover: hover) and (pointer: fine) {
  .btn-primary:hover {
    background: var(--accent-primary-hover);
    border-color: var(--accent-primary-hover);
    color: var(--accent-on-primary);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
  }

  .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
    transform: translateY(-1px);
  }

  .btn-subtle:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: var(--border-medium);
  }

  .btn-white:hover {
    background: #FFFFFF;
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.3);
  }
}

/* Form Controls (16px minimum prevents iOS viewport zoom on input focus) */
input, select, textarea {
  color-scheme: dark;
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 10px 14px;
  outline: none;
  transition: border-color var(--trans-fast), box-shadow var(--trans-fast);
}

select option, optgroup {
  color-scheme: dark;
  background-color: #0B0F17 !important;
  color: #F8FAFC !important;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent-primary);
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}