/**
 * Neumorphism (Soft UI) Design System
 * Core tokens, shadow physics, tactile surfaces, and utility classes
 * Top Hill Bike Rental
 */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400..700;1,9..40,400..700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  /* Surface Clay System */
  --bg-clay: #E0E5EC;
  --fg-primary: #3D4852;
  --fg-muted: #6B7280;
  --fg-light: #94A3B8;

  /* Accent Colors */
  --accent-violet: #6C63FF;
  --accent-violet-hover: #5A50E8;
  --accent-violet-light: #8B84FF;
  --accent-teal: #38B2AC;
  --accent-amber: #F59E0B;
  --accent-emerald: #10B981;

  /* Shadow Physics (Dual Opposing RGBA for Continuous Surface Illusion) */
  --shadow-light: rgba(255, 255, 255, 0.55);
  --shadow-light-strong: rgba(255, 255, 255, 0.7);
  --shadow-dark: rgba(163, 177, 198, 0.62);
  --shadow-dark-strong: rgba(163, 177, 198, 0.75);

  /* Elevation Matrices */
  --neu-extruded: 9px 9px 16px var(--shadow-dark), -9px -9px 16px var(--shadow-light);
  --neu-extruded-hover: 12px 12px 20px var(--shadow-dark-strong), -12px -12px 20px var(--shadow-light-strong);
  --neu-extruded-sm: 5px 5px 10px var(--shadow-dark), -5px -5px 10px var(--shadow-light);
  --neu-extruded-xs: 3px 3px 6px var(--shadow-dark), -3px -3px 6px var(--shadow-light);

  --neu-inset: inset 6px 6px 10px var(--shadow-dark), inset -6px -6px 10px var(--shadow-light);
  --neu-inset-deep: inset 10px 10px 20px var(--shadow-dark-strong), inset -10px -10px 20px var(--shadow-light-strong);
  --neu-inset-sm: inset 3px 3px 6px var(--shadow-dark), inset -3px -3px 6px var(--shadow-light);

  /* Primary Violet Button Shadows */
  --btn-primary-shadow: 7px 7px 14px rgba(108, 99, 255, 0.35), -5px -5px 12px rgba(255, 255, 255, 0.6);
  --btn-primary-hover: 9px 9px 18px rgba(108, 99, 255, 0.45), -7px -7px 16px rgba(255, 255, 255, 0.7);
  --btn-primary-active: inset 4px 4px 8px rgba(45, 38, 140, 0.6), inset -4px -4px 8px rgba(139, 132, 255, 0.4);

  /* Radii Standards */
  --radius-card: 32px;
  --radius-btn: 16px;
  --radius-pill: 9999px;
  --radius-sm: 12px;

  /* Typography */
  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;

  /* Transition Durations */
  --trans-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --trans-base: 300ms cubic-bezier(0.16, 1, 0.3, 1);
  --trans-smooth: 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-color: transparent;
}

html {
  font-family: var(--font-body);
  background-color: var(--bg-clay);
  color: var(--fg-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background-color: var(--bg-clay);
  color: var(--fg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Neumorphic Surface Classes */
.neu-flat {
  background-color: var(--bg-clay);
}

.neu-extruded {
  background-color: var(--bg-clay);
  box-shadow: var(--neu-extruded);
  border-radius: var(--radius-card);
  transition: transform var(--trans-base), box-shadow var(--trans-base);
}

.neu-extruded:hover {
  transform: translateY(-2px);
  box-shadow: var(--neu-extruded-hover);
}

.neu-extruded-sm {
  background-color: var(--bg-clay);
  box-shadow: var(--neu-extruded-sm);
  border-radius: var(--radius-btn);
  transition: transform var(--trans-base), box-shadow var(--trans-base);
}

.neu-inset {
  background-color: var(--bg-clay);
  box-shadow: var(--neu-inset);
  border-radius: var(--radius-btn);
}

.neu-inset-deep {
  background-color: var(--bg-clay);
  box-shadow: var(--neu-inset-deep);
  border-radius: var(--radius-btn);
}

.neu-inset-sm {
  background-color: var(--bg-clay);
  box-shadow: var(--neu-inset-sm);
  border-radius: var(--radius-pill);
}

/* Interactive Button Primitives */
.neu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 24px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-btn);
  border: none;
  outline: none;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
  touch-action: manipulation;
  transition: all var(--trans-base);
}

/* Secondary / Clay Button */
.neu-btn-secondary {
  background-color: var(--bg-clay);
  color: var(--fg-primary);
  box-shadow: var(--neu-extruded-sm);
}

.neu-btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--neu-extruded-hover);
  color: var(--accent-violet);
}

.neu-btn-secondary:active,
.neu-btn-secondary.is-active {
  transform: translateY(1px);
  box-shadow: var(--neu-inset-sm);
}

/* Primary Accent Violet Button */
.neu-btn-primary {
  background: linear-gradient(135deg, var(--accent-violet-light) 0%, var(--accent-violet) 100%);
  color: #FFFFFF;
  box-shadow: var(--btn-primary-shadow);
}

.neu-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--btn-primary-hover);
}

.neu-btn-primary:active {
  transform: translateY(1px);
  box-shadow: var(--btn-primary-active);
}

/* Icon Well (Deeply Carved Recessed Socket) */
.neu-icon-well {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  background-color: var(--bg-clay);
  box-shadow: var(--neu-inset);
  color: var(--accent-violet);
  flex-shrink: 0;
  transition: all var(--trans-base);
}

.neu-icon-well-lg {
  width: 64px;
  height: 64px;
  box-shadow: var(--neu-inset-deep);
}

/* Inset Form Fields */
.neu-input, .neu-select {
  width: 100%;
  min-height: 48px;
  padding: 12px 18px;
  background-color: var(--bg-clay);
  color: var(--fg-primary);
  font-family: var(--font-body);
  font-size: 15px;
  border-radius: var(--radius-btn);
  border: none;
  outline: none;
  box-shadow: var(--neu-inset);
  transition: all var(--trans-base);
}

.neu-input:focus, .neu-select:focus {
  box-shadow: var(--neu-inset-deep);
  outline: 2px solid var(--accent-violet);
  outline-offset: 2px;
}

.neu-input::placeholder {
  color: var(--fg-light);
}

/* Pill Badges */
.neu-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--neu-inset-sm);
  color: var(--fg-primary);
}

.neu-pill-extruded {
  box-shadow: var(--neu-extruded-xs);
  background-color: var(--bg-clay);
}

/* Focus Indicator Accessibility (WCAG AA Compliance) */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent-violet) !important;
  outline-offset: 2px !important;
}

/* Typography Helpers */
.font-display {
  font-family: var(--font-display);
}

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

.text-muted {
  color: var(--fg-muted);
}

.text-accent {
  color: var(--accent-violet);
}

.text-teal {
  color: var(--accent-teal);
}