/* ============================================================
   KINGSBUILD — DESIGN SYSTEM v1.0
   Building Materials Ecommerce | Phase 1
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Barlow:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300&family=Barlow+Condensed:wght@400;500;600;700&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Brand Colors */
  --kb-black:          #0D0D0D;
  --kb-charcoal:       #1A1A1A;
  --kb-graphite:       #2C2C2C;
  --kb-iron:           #3D3D3D;
  --kb-steel:          #666666;
  --kb-concrete:       #999999;
  --kb-fog:            #CCCCCC;
  --kb-ash:            #E8E8E8;
  --kb-white:          #F5F3F0;
  --kb-pure-white:     #FFFFFF;

  /* Brand Gold Accent */
  --kb-gold:           #C9A84C;
  --kb-gold-light:     #E8C96B;
  --kb-gold-dark:      #9A7A2E;
  --kb-gold-pale:      #F5EDD8;

  /* Semantic Colors */
  --kb-success:        #2D7A45;
  --kb-success-bg:     #E8F5EC;
  --kb-warning:        #B87A1A;
  --kb-warning-bg:     #FEF3DC;
  --kb-danger:         #C0392B;
  --kb-danger-bg:      #FDECEA;
  --kb-info:           #1A5B8F;
  --kb-info-bg:        #E8F0FA;

  /* Typography */
  --font-display:      'Bebas Neue', sans-serif;
  --font-condensed:    'Barlow Condensed', sans-serif;
  --font-body:         'Barlow', sans-serif;

  /* Font Sizes */
  --text-xs:           0.75rem;    /* 12px */
  --text-sm:           0.875rem;   /* 14px */
  --text-base:         1rem;       /* 16px */
  --text-md:           1.125rem;   /* 18px */
  --text-lg:           1.25rem;    /* 20px */
  --text-xl:           1.5rem;     /* 24px */
  --text-2xl:          2rem;       /* 32px */
  --text-3xl:          2.5rem;     /* 40px */
  --text-4xl:          3.5rem;     /* 56px */
  --text-5xl:          5rem;       /* 80px */
  --text-6xl:          7rem;       /* 112px */

  /* Spacing Scale */
  --space-1:           0.25rem;
  --space-2:           0.5rem;
  --space-3:           0.75rem;
  --space-4:           1rem;
  --space-5:           1.25rem;
  --space-6:           1.5rem;
  --space-8:           2rem;
  --space-10:          2.5rem;
  --space-12:          3rem;
  --space-16:          4rem;
  --space-20:          5rem;
  --space-24:          6rem;
  --space-32:          8rem;

  /* Border Radius */
  --radius-sm:         2px;
  --radius-md:         4px;
  --radius-lg:         8px;
  --radius-xl:         12px;
  --radius-2xl:        20px;
  --radius-full:       9999px;

  /* Shadows */
  --shadow-sm:         0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  --shadow-md:         0 4px 12px rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.10);
  --shadow-lg:         0 10px 30px rgba(0,0,0,0.20), 0 4px 8px rgba(0,0,0,0.12);
  --shadow-xl:         0 20px 50px rgba(0,0,0,0.25), 0 8px 16px rgba(0,0,0,0.15);
  --shadow-gold:       0 4px 20px rgba(201,168,76,0.35);
  --shadow-inset:      inset 0 2px 8px rgba(0,0,0,0.12);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
  --transition-spring: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index Scale */
  --z-below:          -1;
  --z-base:            0;
  --z-raised:          10;
  --z-dropdown:        100;
  --z-sticky:          200;
  --z-overlay:         300;
  --z-modal:           400;
  --z-toast:           500;

  /* Layout */
  --container-max:     1320px;
  --container-wide:    1560px;
  --header-height:     72px;
  --header-top-height: 40px;
  --sidebar-width:     280px;

  /* Grid */
  --grid-gap:          1.5rem;
  --section-gap:       5rem;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--kb-charcoal);
  background-color: var(--kb-white);
  overflow-x: hidden;
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

ul, ol { list-style: none; }

/* ── Typography System ── */
.display-1 {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  line-height: 0.92;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.display-2 {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  line-height: 0.94;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.display-3 {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  line-height: 0.96;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.heading-1 {
  font-family: var(--font-condensed);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
}
.heading-2 {
  font-family: var(--font-condensed);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
}
.heading-3 {
  font-family: var(--font-condensed);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.25;
}
.label-caps {
  font-family: var(--font-condensed);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.label-md {
  font-family: var(--font-condensed);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.body-lg {
  font-size: var(--text-md);
  font-weight: 300;
  line-height: 1.7;
}
.body-base { font-size: var(--text-base); line-height: 1.65; }
.body-sm { font-size: var(--text-sm); line-height: 1.6; }

/* ── Color Utilities ── */
.text-gold { color: var(--kb-gold); }
.text-steel { color: var(--kb-steel); }
.text-white { color: var(--kb-pure-white); }
.text-black { color: var(--kb-black); }
.bg-black { background-color: var(--kb-black); }
.bg-charcoal { background-color: var(--kb-charcoal); }
.bg-white { background-color: var(--kb-pure-white); }
.bg-ash { background-color: var(--kb-ash); }
.bg-gold { background-color: var(--kb-gold); }

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container--wide {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container--narrow {
  max-width: 760px;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ── Grid Utilities ── */
.grid { display: grid; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ── Button System ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.75rem;
  font-family: var(--font-condensed);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition-fast);
}
.btn:hover::after { background: rgba(255,255,255,0.07); }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--kb-gold);
  color: var(--kb-black);
  box-shadow: var(--shadow-gold);
}
.btn--primary:hover {
  background: var(--kb-gold-light);
  box-shadow: 0 6px 28px rgba(201,168,76,0.50);
  transform: translateY(-1px);
}

.btn--dark {
  background: var(--kb-black);
  color: var(--kb-white);
  border: 1px solid var(--kb-iron);
}
.btn--dark:hover {
  background: var(--kb-iron);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: var(--kb-charcoal);
  border: 1.5px solid var(--kb-iron);
}
.btn--outline:hover {
  background: var(--kb-charcoal);
  color: var(--kb-white);
  border-color: var(--kb-charcoal);
}

.btn--ghost {
  background: transparent;
  color: var(--kb-gold);
  padding-inline: 0;
  letter-spacing: 0.12em;
}
.btn--ghost::before {
  content: '';
  display: inline-block;
  width: 1.5rem;
  height: 1.5px;
  background: var(--kb-gold);
  margin-right: var(--space-3);
  transition: width var(--transition-base);
}
.btn--ghost:hover::before { width: 2.5rem; }

.btn--sm { padding: 0.5rem 1.25rem; font-size: var(--text-xs); }
.btn--lg { padding: 1rem 2.5rem; font-size: var(--text-base); }
.btn--icon {
  padding: 0.625rem;
  border-radius: var(--radius-md);
  line-height: 1;
}

/* ── Badge System ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-family: var(--font-condensed);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}
.badge--gold { background: var(--kb-gold); color: var(--kb-black); }
.badge--dark { background: var(--kb-charcoal); color: var(--kb-white); }
.badge--sale { background: var(--kb-danger); color: var(--kb-pure-white); }
.badge--new { background: var(--kb-success); color: var(--kb-pure-white); }
.badge--out { background: var(--kb-fog); color: var(--kb-steel); }
.badge--featured { background: var(--kb-gold-pale); color: var(--kb-gold-dark); border: 1px solid var(--kb-gold); }

/* ── Card System ── */
.card {
  background: var(--kb-pure-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}
.card--elevated {
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--kb-ash);
}
.card--elevated:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.card--flat { border: 1px solid var(--kb-ash); }
.card--dark {
  background: var(--kb-charcoal);
  color: var(--kb-white);
}

/* ── Form Elements ── */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label {
  font-family: var(--font-condensed);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--kb-graphite);
}
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--kb-charcoal);
  background: var(--kb-pure-white);
  border: 1.5px solid var(--kb-fog);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}
.form-input:hover,
.form-select:hover,
.form-textarea:hover { border-color: var(--kb-concrete); }
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--kb-gold);
  box-shadow: 0 0 0 3px rgba(201,168,76,0.15);
}
.form-input::placeholder { color: var(--kb-concrete); }

/* ── Section Spacing ── */
.section { padding-block: var(--section-gap); }
.section--sm { padding-block: var(--space-12); }
.section--lg { padding-block: calc(var(--section-gap) * 1.5); }

/* ── Divider ── */
.divider {
  width: 3rem;
  height: 3px;
  background: var(--kb-gold);
  margin-block: var(--space-4);
}
.divider--lg { width: 5rem; height: 4px; }
.divider--full { width: 100%; height: 1px; background: var(--kb-ash); }

/* ── Overlay ── */
.overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.overlay--dark { background: rgba(0,0,0,0.5); }
.overlay--gradient-bottom {
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.3) 50%, transparent 100%);
}
.overlay--gradient-right {
  background: linear-gradient(to left, rgba(13,13,13,0.95) 0%, rgba(13,13,13,0.6) 50%, transparent 100%);
}

/* ── Rating Stars ── */
.stars { display: inline-flex; gap: 2px; color: var(--kb-gold); font-size: 1rem; }

/* ── Price Display ── */
.price-current {
  font-family: var(--font-condensed);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--kb-black);
}
.price-original {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--kb-concrete);
  text-decoration: line-through;
}
.price-saving {
  font-family: var(--font-condensed);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--kb-danger);
}

/* ── Quantity Control ── */
.qty-control {
  display: inline-flex;
  align-items: center;
  border: 1.5px solid var(--kb-fog);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.qty-control__btn {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--kb-ash);
  color: var(--kb-iron);
  font-size: 1.2rem;
  font-weight: 300;
  transition: background var(--transition-fast);
  cursor: pointer;
  border: none;
}
.qty-control__btn:hover { background: var(--kb-fog); }
.qty-control__input {
  width: 3rem;
  text-align: center;
  border: none;
  font-family: var(--font-condensed);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--kb-black);
  outline: none;
}

/* ── Tag / Chip ── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.3rem 0.8rem;
  background: var(--kb-ash);
  color: var(--kb-graphite);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid var(--kb-fog);
}
.tag:hover,
.tag.active {
  background: var(--kb-black);
  color: var(--kb-white);
  border-color: var(--kb-black);
}

/* ── Breadcrumb ── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--kb-steel);
}
.breadcrumb__separator { color: var(--kb-concrete); }
.breadcrumb__item--active { color: var(--kb-charcoal); font-weight: 500; }

/* ── Tooltip ── */
.tooltip-wrapper { position: relative; }
.tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  background: var(--kb-black);
  color: var(--kb-white);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: var(--z-dropdown);
}
.tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--kb-black);
}
.tooltip-wrapper:hover .tooltip { opacity: 1; }

/* ── Loading Skeleton ── */
.skeleton {
  background: linear-gradient(90deg, var(--kb-ash) 25%, var(--kb-fog) 50%, var(--kb-ash) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Utilities ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.aspect-square { aspect-ratio: 1; }
.aspect-video { aspect-ratio: 16/9; }
.aspect-product { aspect-ratio: 4/3; }
.object-cover { object-fit: cover; width: 100%; height: 100%; }
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { inset: 0; }
.overflow-hidden { overflow: hidden; }
.cursor-pointer { cursor: pointer; }

/* ── Animations ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-24px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

.animate-fade-up { animation: fadeInUp 0.6s ease forwards; }
.animate-fade-in { animation: fadeIn 0.4s ease forwards; }
.animate-slide-left { animation: slideInLeft 0.5s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--kb-ash); }
::-webkit-scrollbar-thumb { background: var(--kb-concrete); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--kb-steel); }

/* ── Selection ── */
::selection { background: rgba(201,168,76,0.25); color: var(--kb-black); }

/* ── Focus Visible ── */
:focus-visible {
  outline: 2px solid var(--kb-gold);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── Print ── */
@media print {
  .no-print { display: none !important; }
}

/* ── Responsive ── */
@media (max-width: 1200px) {
  :root { --section-gap: 4rem; }
}
@media (max-width: 768px) {
  :root {
    --section-gap: 3rem;
    --container-max: 100%;
  }
  .display-1 { font-size: 4rem; }
  .display-2 { font-size: 3rem; }
  .display-3 { font-size: 2.25rem; }
  .container { padding-inline: var(--space-4); }
}
@media (max-width: 480px) {
  .display-1 { font-size: 2.75rem; }
  .display-2 { font-size: 2.25rem; }
  .btn--lg { padding: 0.875rem 1.75rem; font-size: var(--text-sm); }
}

/* ── Phase 10: Skip Link, Reduce Motion, Font Loading ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--kb-gold);
  color: var(--kb-black);
  font-family: var(--font-condensed);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  z-index: 9999;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: 0; }

/* Reduce motion — disable all animations and transitions */
.reduce-motion *,
.reduce-motion *::before,
.reduce-motion *::after {
  animation-duration: 0.001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.001ms !important;
  scroll-behavior: auto !important;
}

/* FOUT prevention — hide text until custom fonts ready */
.fonts-loaded body { }  /* hook for JS — fonts-loaded class signals fonts are ready */

/* ── Print styles (expanded) ── */
@media print {
  .top-bar,
  .header,
  .mobile-nav,
  .footer,
  .sticky-buy-bar,
  .no-print { display: none !important; }

  body { background: #fff !important; color: #000 !important; font-size: 11pt; }
  a { color: #000; text-decoration: underline; }
  a[href]::after { content: ' (' attr(href) ')'; font-size: 8pt; }
  .container { max-width: 100% !important; padding: 0 !important; }

  /* Product detail — keep gallery and info visible */
  .product-layout { display: block; }
  .product-gallery { width: 60%; margin: 0 auto 1cm; }
  .spec-table { width: 100%; border-collapse: collapse; }
  .spec-table td { border: 1px solid #ccc; padding: 4pt 6pt; }
}