/* ==========================================================================
   Base — CSS variables, reset, typography, layout utilities
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Brand colors — Quest red + dark palette */
  --qt-color-primary:    #CC0000;
  --qt-color-primary-dark: #A30000;
  --qt-color-secondary:  #1A1A2E;
  --qt-color-dark:       #111111;

  /* Semantic colors */
  --qt-color-text:       #222222;
  --qt-color-muted:      #6B6B6B;
  --qt-color-light:      #999999;
  --qt-color-background: #FFFFFF;
  --qt-color-surface:    #F5F5F7;
  --qt-color-card:       #FFFFFF;
  --qt-color-border:     #E5E7EB;
  --qt-color-success:    #27AE60;
  --qt-color-warning:    #F39C12;
  --qt-color-error:      #E74C3C;

  /* Typography — industrial/manufacturing feel */
  --qt-font-heading:  'Barlow Condensed', sans-serif;
  --qt-font-body:     'Barlow', sans-serif;

  --qt-text-xs:   0.75rem;
  --qt-text-sm:   0.875rem;
  --qt-text-base: 1rem;
  --qt-text-lg:   1.125rem;
  --qt-text-xl:   1.25rem;
  --qt-text-2xl:  1.5rem;
  --qt-text-3xl:  1.875rem;
  --qt-text-4xl:  2.25rem;
  --qt-text-5xl:  3rem;

  --qt-weight-normal:    400;
  --qt-weight-medium:    500;
  --qt-weight-semibold:  600;
  --qt-weight-bold:      700;
  --qt-weight-extrabold: 800;
  --qt-weight-black:     900;

  /* Spacing scale */
  --qt-space-1:  0.25rem;
  --qt-space-2:  0.5rem;
  --qt-space-3:  0.75rem;
  --qt-space-4:  1rem;
  --qt-space-5:  1.25rem;
  --qt-space-6:  1.5rem;
  --qt-space-8:  2rem;
  --qt-space-10: 2.5rem;
  --qt-space-12: 3rem;
  --qt-space-16: 4rem;
  --qt-space-20: 5rem;
  --qt-space-24: 6rem;

  /* Layout */
  --qt-container-max: 1280px;
  --qt-container-pad: 1rem;

  /* Radii */
  --qt-radius-sm:   4px;
  --qt-radius:      8px;
  --qt-radius-md:   12px;
  --qt-radius-lg:   16px;
  --qt-radius-full: 9999px;

  /* Shadows */
  --qt-shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.08);
  --qt-shadow:    0 4px 12px 0 rgb(0 0 0 / 0.08);
  --qt-shadow-md: 0 8px 24px 0 rgb(0 0 0 / 0.1);
  --qt-shadow-lg: 0 16px 40px 0 rgb(0 0 0 / 0.12);

  /* Transitions */
  --qt-transition:      0.2s ease;
  --qt-transition-slow: 0.35s ease;

  /* Header */
  --qt-header-height:  80px;
  --qt-top-bar-height: 36px;

  /* Z-index layers */
  --qt-z-base:   1;
  --qt-z-header: 100;
  --qt-z-drawer: 200;
  --qt-z-modal:  300;
  --qt-z-toast:  400;
}

/* --------------------------------------------------------------------------
   2. Box-sizing and base reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--qt-font-body);
  font-size: var(--qt-text-base);
  font-weight: var(--qt-weight-normal);
  line-height: 1.6;
  color: var(--qt-color-text);
  background-color: var(--qt-color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--qt-color-primary);
  text-decoration: none;
  transition: color var(--qt-transition);
}

a:hover {
  color: var(--qt-color-primary-dark);
}

/* --------------------------------------------------------------------------
   3. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--qt-font-heading);
  font-weight: var(--qt-weight-bold);
  line-height: 1.2;
  margin: 0 0 var(--qt-space-4);
  color: var(--qt-color-dark);
}

h1 { font-size: var(--qt-text-4xl); }
h2 { font-size: var(--qt-text-3xl); }
h3 { font-size: var(--qt-text-2xl); }
h4 { font-size: var(--qt-text-xl); }
h5 { font-size: var(--qt-text-lg); }
h6 { font-size: var(--qt-text-base); }

p {
  margin: 0 0 var(--qt-space-4);
}

/* --------------------------------------------------------------------------
   4. Layout utilities
   -------------------------------------------------------------------------- */
.qt-container {
  width: 100%;
  max-width: var(--qt-container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--qt-container-pad);
  padding-right: var(--qt-container-pad);
}

.qt-main {
  min-height: 60vh;
  padding: 0 0 var(--qt-space-8);
}

.qt-main--home {
  padding: 0;
}

/* --------------------------------------------------------------------------
   5. Screen reader text
   -------------------------------------------------------------------------- */
.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  word-wrap: normal !important;
}

.screen-reader-text:focus {
  background-color: #f1f1f1;
  border-radius: 3px;
  box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
  clip: auto !important;
  clip-path: none;
  color: #21759b;
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  height: auto;
  left: 5px;
  line-height: normal;
  padding: 15px 23px 14px;
  text-decoration: none;
  top: 5px;
  width: auto;
  z-index: 100000;
}

.qt-skip-link:focus {
  z-index: calc(var(--qt-z-toast) + 1);
}

/* --------------------------------------------------------------------------
   6. Scroll reveal animations (CSS-only, no JS overhead)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .qt-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .qt-reveal--visible {
    opacity: 1;
    transform: translateY(0);
  }

  .qt-reveal-delay-1 { transition-delay: 0.1s; }
  .qt-reveal-delay-2 { transition-delay: 0.2s; }
  .qt-reveal-delay-3 { transition-delay: 0.3s; }
  .qt-reveal-delay-4 { transition-delay: 0.4s; }
}

/* --------------------------------------------------------------------------
   7. Back to top button
   -------------------------------------------------------------------------- */
.qt-back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--qt-z-toast);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--qt-color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  box-shadow: var(--qt-shadow-md);
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.2s ease;
  pointer-events: none;
}

.qt-back-to-top--visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.qt-back-to-top:hover {
  background: var(--qt-color-primary-dark);
}

@media (max-width: 1023px) {
  .qt-back-to-top {
    bottom: 70px;
  }
}

/* --------------------------------------------------------------------------
   8. Loading skeleton animation
   -------------------------------------------------------------------------- */
@keyframes qt-skeleton {
  0% { background-position: -200px 0; }
  100% { background-position: calc(200px + 100%) 0; }
}

.qt-skeleton {
  background: linear-gradient(90deg, var(--qt-color-surface) 0%, #e8e8e8 50%, var(--qt-color-surface) 100%);
  background-size: 200px 100%;
  animation: qt-skeleton 1.5s ease infinite;
  border-radius: var(--qt-radius-sm);
}

/* Price loading text */
.quest-price__loading {
  display: inline-block;
  color: var(--qt-color-muted);
  font-size: var(--qt-text-sm);
}

/* --------------------------------------------------------------------------
   9. Product image hover zoom
   -------------------------------------------------------------------------- */
.qt-zoom-wrap {
  position: relative;
  overflow: hidden;
  cursor: crosshair;
}

.qt-zoom-lens {
  position: absolute;
  inset: 0;
  z-index: 5;
  background-repeat: no-repeat;
  background-size: 200%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.qt-zoom-wrap:hover .qt-zoom-lens {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   10. Sticky Add to Quote bar
   -------------------------------------------------------------------------- */
.qt-sticky-quote {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--qt-z-header);
  background: var(--qt-color-dark);
  border-top: 2px solid var(--qt-color-primary);
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.qt-sticky-quote--visible {
  transform: translateY(0);
}

.qt-sticky-quote__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--qt-space-3) var(--qt-container-pad);
  max-width: var(--qt-container-max);
  margin: 0 auto;
}

.qt-sticky-quote__name {
  color: #fff;
  font-family: var(--qt-font-heading);
  font-size: var(--qt-text-sm);
  font-weight: var(--qt-weight-bold);
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-right: var(--qt-space-4);
}

.qt-sticky-quote__btn {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   6. Responsive breakpoints reference (mobile-first)
   --------------------------------------------------------------------------
   480px  — small phone landscape
   768px  — tablet
   1024px — small desktop
   1280px — desktop
   1440px — wide
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  :root {
    --qt-container-pad: 1.5rem;
  }
}

@media (min-width: 1280px) {
  :root {
    --qt-container-pad: 2rem;
  }
}