/* ============================================================
   MK DESIGN - Premium Dark Stone Catalog
   Complete CSS Stylesheet
   ============================================================ */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Montserrat:wght@300;400;500;600;700&display=swap');

/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
  --primary-dark: #1A1A1A;
  --secondary-dark: #2A2A2A;
  --gold: #D4AF37;
  --gold-hover: #B8960C;
  --gold-glow: rgba(212, 175, 55, 0.3);
  --gold-subtle: rgba(212, 175, 55, 0.1);
  --white: #FFFFFF;
  --text-muted: #B0A89A;
  --border-subtle: rgba(176, 168, 154, 0.15);
  --overlay-dark: rgba(26, 26, 26, 0.85);
  --overlay-black: rgba(0, 0, 0, 0.6);
  --card-bg: #222222;
  --input-bg: #1E1E1E;
  --nav-bg: #111111;
  --font-heading: 'Bebas Neue', sans-serif;
  --font-body: 'Montserrat', sans-serif;
  --nav-height: 60px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-lift: 0 8px 24px rgba(0, 0, 0, 0.4);
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  background-color: var(--primary-dark);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

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

a:hover {
  color: var(--gold-hover);
}

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

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  touch-action: manipulation;
}

input,
textarea,
select {
  font-family: var(--font-body);
  font-size: 14px;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.04em;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--primary-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gold-hover);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--gold) var(--primary-dark);
}

/* ============================================================
   Keyframe Animations
   ============================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUpFull {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

@keyframes slideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 var(--gold-glow);
  }
  50% {
    box-shadow: 0 0 20px 4px var(--gold-glow);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes goldLine {
  from { width: 0; }
  to { width: 80px; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
   Utility Classes
   ============================================================ */
.hidden {
  display: none !important;
}

.screen {
  display: none;
}

.screen.active {
  display: block;
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease forwards;
}

.slide-up {
  animation: slideUp var(--transition-slow) ease forwards;
}

.scale-in {
  animation: scaleIn var(--transition-base) ease forwards;
}

.gold-text {
  color: var(--gold);
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--secondary-dark) 25%,
    rgba(148, 163, 184, 0.08) 50%,
    var(--secondary-dark) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text {
  height: 14px;
  margin-bottom: 8px;
  border-radius: 4px;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-image {
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================================
   Splash Screen
   ============================================================ */
#splash-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-dark);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#splash-screen.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.splash-logo {
  font-family: var(--font-heading);
  font-size: 48px;
  letter-spacing: 0.1em;
  color: var(--white);
  margin-bottom: 16px;
  animation: scaleIn 0.8s ease forwards;
}

.splash-logo .gold {
  color: var(--gold);
}

.splash-line {
  height: 2px;
  background: var(--gold);
  animation: goldLine 1s ease 0.4s forwards;
  width: 0;
  margin-bottom: 20px;
}

.splash-tagline {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
  opacity: 0;
  animation: fadeIn 0.6s ease 0.8s forwards;
}

/* ============================================================
   App Container & Layout
   ============================================================ */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  padding-bottom: calc(var(--nav-height) + var(--safe-bottom));
}

.content-area {
  flex: 1;
  width: 100%;
  max-width: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ============================================================
   Bottom Navigation Bar
   ============================================================ */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: calc(var(--nav-height) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--nav-bg);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-around;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex: 1;
  padding: 6px 0;
  color: var(--text-muted);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  position: relative;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.nav-item i,
.nav-item .nav-icon {
  font-size: 20px;
  margin-bottom: 2px;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-item span {
  font-size: 10px;
}

.nav-item.active {
  color: var(--gold);
}

.nav-item.active i,
.nav-item.active .nav-icon {
  transform: scale(1.1);
}

.nav-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gold);
  border-radius: 0 0 2px 2px;
  transition: width var(--transition-fast);
}

.nav-item.active::before {
  width: 32px;
}

/* ============================================================
   Home Screen
   ============================================================ */
#home-screen {
  position: relative;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 24px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(26, 26, 26, 0.7) 0%,
    rgba(26, 26, 26, 0.85) 50%,
    var(--primary-dark) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 480px;
  width: 100%;
}

.hero-logo {
  margin-bottom: 12px;
}

.hero-logo-text {
  font-family: var(--font-heading);
  font-size: 56px;
  letter-spacing: 0.12em;
  line-height: 1;
  color: var(--white);
}

.hero-logo-text .accent {
  color: var(--gold);
}

.hero-tagline {
  font-size: 13px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 300;
}

.hero-divider {
  width: 60px;
  height: 2px;
  background: var(--gold);
  margin: 20px auto 32px;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 40px;
  font-weight: 300;
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
}

.hero-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 24px;
  border: 1.5px solid var(--gold);
  border-radius: var(--radius-full);
  color: var(--gold);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: transparent;
  transition: all var(--transition-base);
  touch-action: manipulation;
}

.hero-btn i {
  font-size: 18px;
}

.hero-btn:hover,
.hero-btn:active {
  background: var(--gold);
  color: var(--primary-dark);
  box-shadow: 0 0 24px var(--gold-glow);
}

.hero-btn.primary {
  background: var(--gold);
  color: var(--primary-dark);
}

.hero-btn.primary:hover,
.hero-btn.primary:active {
  background: var(--gold-hover);
  border-color: var(--gold-hover);
  box-shadow: 0 0 24px var(--gold-glow);
}

.hero-gradient-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--primary-dark), transparent);
  z-index: 1;
  pointer-events: none;
}

/* ============================================================
   Catalog Screen
   ============================================================ */
#catalog-screen {
  padding-top: 0;
}

/* Sticky Filter Bar */
.filter-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--primary-dark);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.search-wrapper {
  position: relative;
  margin-bottom: 12px;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--input-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--white);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-input::placeholder {
  color: var(--text-muted);
  font-weight: 300;
}

.search-input:focus {
  border-color: var(--gold);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
  pointer-events: none;
}

.search-clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
  padding: 4px;
  display: none;
  touch-action: manipulation;
}

.search-clear.visible {
  display: block;
}

/* Filter Chips */
.filter-chips {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.filter-chips::-webkit-scrollbar {
  display: none;
}

.filter-chip {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  background: var(--secondary-dark);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
  white-space: nowrap;
  touch-action: manipulation;
}

.filter-chip:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.filter-chip.active {
  background: var(--gold);
  color: var(--primary-dark);
  border-color: var(--gold);
  font-weight: 600;
}

/* Active Filter Tags */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.active-filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--gold-subtle);
  color: var(--gold);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
}

.active-filter-tag .remove {
  font-size: 14px;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
  touch-action: manipulation;
}

.active-filter-tag .remove:hover {
  opacity: 1;
}

/* Results Info */
.results-info {
  padding: 10px 16px;
  font-size: 12px;
  color: var(--text-muted);
}

.results-count {
  color: var(--gold);
  font-weight: 600;
}

/* Stone Grid */
.stone-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 8px 16px 24px;
}

/* Stone Card */
.stone-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
}

.stone-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.stone-card:active {
  transform: translateY(-2px);
}

.stone-card-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

.stone-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.stone-card:hover .stone-card-image img {
  transform: scale(1.08);
}

.stone-card-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 3px 8px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  background: rgba(26, 26, 26, 0.75);
  color: var(--white);
  backdrop-filter: blur(4px);
}

.stone-card-body {
  padding: 12px;
}

.stone-card-name {
  font-family: var(--font-heading);
  font-size: 18px;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
  color: var(--white);
  line-height: 1.2;
}

.stone-card-origin {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 8px;
}

.stone-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stone-type-badge {
  padding: 3px 8px;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  background: var(--gold-subtle);
  color: var(--gold);
}

.stone-color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid var(--border-subtle);
  flex-shrink: 0;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 24px;
  grid-column: 1 / -1;
}

.empty-state-icon {
  font-size: 48px;
  color: var(--text-muted);
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-title {
  font-family: var(--font-heading);
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--white);
}

.empty-state-text {
  font-size: 13px;
  color: var(--text-muted);
  max-width: 260px;
  line-height: 1.6;
}

/* Loading Skeleton Cards */
.skeleton-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.skeleton-card .skeleton-image {
  width: 100%;
  aspect-ratio: 1 / 1;
}

.skeleton-card .skeleton-body {
  padding: 12px;
}

/* ============================================================
   Stone Detail View
   ============================================================ */
#stone-detail {
  position: fixed;
  inset: 0;
  z-index: 800;
  background: var(--primary-dark);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  transform: translateY(100%);
  transition: transform var(--transition-base);
  visibility: hidden;
}

#stone-detail.active {
  transform: translateY(0);
  visibility: visible;
}

.detail-close {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 810;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(26, 26, 26, 0.8);
  border-radius: 50%;
  color: var(--white);
  font-size: 20px;
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
  touch-action: manipulation;
}

.detail-close:hover {
  background: var(--gold);
  color: var(--primary-dark);
}

/* Image Gallery */
.detail-gallery {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.gallery-track {
  display: flex;
  transition: transform var(--transition-base);
}

.gallery-slide {
  min-width: 100%;
  aspect-ratio: 4 / 3;
}

.gallery-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 12px 0;
}

.gallery-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-subtle);
  transition: all var(--transition-fast);
  cursor: pointer;
  touch-action: manipulation;
}

.gallery-dot.active {
  background: var(--gold);
  width: 24px;
  border-radius: 4px;
}

/* Detail Info */
.detail-info {
  padding: 20px 20px 120px;
}

.detail-title {
  font-family: var(--font-heading);
  font-size: 32px;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.detail-origin {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.detail-section {
  margin-bottom: 24px;
}

.detail-section-title {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--gold);
  margin-bottom: 12px;
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.info-item {
  background: var(--secondary-dark);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.info-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.info-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
}

/* Hardness Bar */
.hardness-bar-wrapper {
  margin-top: 4px;
}

.hardness-bar {
  width: 100%;
  height: 6px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.hardness-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold-hover), var(--gold));
  border-radius: var(--radius-full);
  transition: width 0.8s ease;
}

.hardness-label {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Tags / Uses */
.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--secondary-dark);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

/* Processing Methods */
.methods-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.method-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  background: var(--secondary-dark);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  text-align: center;
  transition: border-color var(--transition-fast);
}

.method-card:hover {
  border-color: var(--gold);
}

.method-card i,
.method-card .method-icon {
  font-size: 24px;
  color: var(--gold);
}

.method-card span {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

/* Detail CTA */
.detail-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px 20px;
  padding-bottom: calc(16px + var(--safe-bottom));
  background: linear-gradient(to top, var(--primary-dark) 60%, transparent);
  z-index: 810;
}

.cta-whatsapp {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px;
  background: var(--gold);
  color: var(--primary-dark);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  touch-action: manipulation;
}

.cta-whatsapp i {
  font-size: 20px;
}

.cta-whatsapp:hover {
  background: var(--gold-hover);
  box-shadow: 0 0 24px var(--gold-glow);
}

/* ============================================================
   3D Viewer
   ============================================================ */
#three-viewer {
  position: fixed;
  inset: 0;
  z-index: 850;
  background: #000000;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#three-viewer.active {
  display: flex;
}

#three-viewer canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.viewer-close {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 860;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(26, 26, 26, 0.85);
  border-radius: 50%;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.5);
  transition: all var(--transition-fast);
  touch-action: manipulation;
  cursor: pointer;
  backdrop-filter: blur(8px);
}

.viewer-close svg {
  width: 28px;
  height: 28px;
  stroke-width: 2.5;
}

.viewer-close:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #fff;
  transform: scale(1.1);
}

.viewer-loading {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--white);
  font-size: 14px;
}

.viewer-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.viewer-hint {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
  padding: 8px 16px;
  background: rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

/* ============================================================
   Portfolio Screen
   ============================================================ */
#portfolio-screen {
  padding-top: 0;
}

.portfolio-header {
  padding: 24px 16px 0;
}

.portfolio-title {
  font-family: var(--font-heading);
  font-size: 28px;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

/* Category Tabs */
/* Project Search */
.project-search-wrapper {
  position: relative;
  padding: 0 16px 12px;
}

.project-search-icon {
  position: absolute;
  left: 28px;
  top: 50%;
  transform: translateY(calc(-50% - 6px));
  color: var(--text-muted);
  pointer-events: none;
}

.project-search-input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  background: var(--secondary-dark);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--white);
  font-size: 14px;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.project-search-input::placeholder {
  color: var(--text-muted);
}

.project-search-input:focus {
  outline: none;
  border-color: var(--gold);
}

/* Project Filters */
.project-filters {
  display: flex;
  gap: 8px;
  padding: 0 16px 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

.project-filters::-webkit-scrollbar {
  display: none;
}

.project-filter-select {
  flex-shrink: 0;
  padding: 7px 28px 7px 12px;
  background: var(--secondary-dark);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 12px;
  font-family: inherit;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.project-filter-select:focus {
  outline: none;
  border-color: var(--gold);
  color: var(--white);
}

.project-filter-select.active-filter {
  border-color: var(--gold);
  color: var(--gold);
}

.category-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 16px 12px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
  display: none;
}

.category-tab {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--secondary-dark);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
  white-space: nowrap;
  touch-action: manipulation;
}

.category-tab.active {
  background: var(--gold);
  color: var(--primary-dark);
  border-color: var(--gold);
  font-weight: 600;
}

.category-tab:hover:not(.active) {
  border-color: var(--gold);
  color: var(--gold);
}

/* Project Grid */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 0 16px 24px;
}

.project-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 16 / 10;
}

.project-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26, 26, 26, 0.9) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
}

.project-name {
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--white);
  margin-bottom: 4px;
}

.project-location {
  font-size: 12px;
  color: var(--text-muted);
}

.project-category {
  font-size: 11px;
  color: var(--gold);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

/* Project Detail (full screen gallery) */
.project-detail-overlay {
  position: fixed;
  inset: 0;
  z-index: 800;
  background: var(--primary-dark);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: none;
}

.project-detail-overlay.active {
  display: block;
  animation: fadeIn var(--transition-base) ease;
}

.project-detail-gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.project-detail-gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ============================================================
   Contact Screen
   ============================================================ */
#contact-screen {
  padding: 24px 16px;
}

.contact-header {
  margin-bottom: 24px;
}

.contact-title {
  font-family: var(--font-heading);
  font-size: 28px;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.contact-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Business Info Cards */
.info-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.info-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--secondary-dark);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.info-card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 20px;
  flex-shrink: 0;
}

.info-card-content {
  flex: 1;
  min-width: 0;
}

.info-card-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.info-card-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  word-break: break-word;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all var(--transition-base);
  touch-action: manipulation;
}

.action-btn i {
  font-size: 20px;
}

.action-btn.whatsapp {
  background: #25D366;
  color: var(--white);
}

.action-btn.whatsapp:hover {
  background: #1DA851;
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.3);
}

.action-btn.phone {
  background: #3B82F6;
  color: var(--white);
}

.action-btn.phone:hover {
  background: #2563EB;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.action-btn.email {
  background: var(--gold);
  color: var(--primary-dark);
}

.action-btn.email:hover {
  background: var(--gold-hover);
  box-shadow: 0 4px 16px var(--gold-glow);
}

/* Google Maps */
.map-container {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 32px;
  border: 1px solid var(--border-subtle);
}

.map-container iframe {
  width: 100%;
  height: 240px;
  border: none;
  display: block;
}

/* Working Hours */
.hours-section {
  margin-bottom: 32px;
}

.hours-title {
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  color: var(--gold);
}

.hours-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hours-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--secondary-dark);
  border-radius: var(--radius-sm);
}

.hours-day {
  font-size: 13px;
  font-weight: 500;
}

.hours-time {
  font-size: 13px;
  color: var(--text-muted);
}

.hours-row.today {
  border: 1px solid var(--gold);
}

.hours-row.today .hours-day {
  color: var(--gold);
  font-weight: 600;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-title {
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--gold);
  margin-bottom: 4px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.form-input,
.form-textarea {
  padding: 14px 16px;
  background: var(--input-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--white);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
  font-weight: 300;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--gold);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  padding: 16px;
  background: var(--gold);
  color: var(--primary-dark);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  touch-action: manipulation;
  margin-top: 4px;
}

.form-submit:hover {
  background: var(--gold-hover);
  box-shadow: 0 4px 16px var(--gold-glow);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ============================================================
   Section Header (reusable)
   ============================================================ */
.section-header {
  padding: 24px 16px 16px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 28px;
  letter-spacing: 0.06em;
}

.section-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================================
   Loading Overlay
   ============================================================ */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 950;
  background: var(--overlay-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.loading-spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ============================================================
   Toast / Notification
   ============================================================ */
.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + var(--safe-bottom) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 24px;
  background: var(--secondary-dark);
  color: var(--white);
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lift);
  z-index: 950;
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ============================================================
   Responsive: Tablet (768px+)
   ============================================================ */
@media (min-width: 768px) {
  body {
    font-size: 15px;
  }

  .hero-logo-text {
    font-size: 72px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-cta-group {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 520px;
  }

  .hero-btn {
    flex: 0 0 auto;
    padding: 14px 28px;
  }

  /* Catalog grid: 3 columns */
  .stone-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding: 12px 24px 32px;
  }

  .filter-bar {
    padding: 14px 24px;
  }

  .results-info {
    padding: 10px 24px;
  }

  /* Stone Detail: modal style */
  #stone-detail {
    top: auto;
    left: 50%;
    right: auto;
    bottom: 0;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    transform: translateX(-50%) translateY(100%);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  #stone-detail.active {
    transform: translateX(-50%) translateY(0);
  }

  .detail-cta {
    max-width: 600px;
    left: 50%;
    transform: translateX(-50%);
  }

  /* Portfolio */
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 24px 32px;
  }

  /* Contact */
  #contact-screen {
    padding: 32px 24px;
    max-width: 700px;
    margin: 0 auto;
  }

  .action-buttons {
    flex-direction: row;
  }

  .action-btn {
    flex: 1;
  }

  .map-container iframe {
    height: 320px;
  }

  /* Info grid: 2 columns consistent */
  .info-cards {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .info-card {
    flex: 1 1 calc(50% - 6px);
    min-width: 240px;
  }
}

/* ============================================================
   Responsive: Desktop (1024px+)
   ============================================================ */
@media (min-width: 1024px) {
  /* Hide bottom nav, use side nav or top nav */
  .bottom-nav {
    top: 0;
    bottom: auto;
    height: 56px;
    border-top: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 0;
    justify-content: center;
    gap: 8px;
  }

  .nav-item {
    flex-direction: row;
    gap: 6px;
    flex: 0 0 auto;
    padding: 8px 20px;
  }

  .nav-item i,
  .nav-item .nav-icon {
    font-size: 18px;
    margin-bottom: 0;
  }

  .nav-item span {
    font-size: 12px;
    font-weight: 500;
  }

  .nav-item::before {
    top: auto;
    bottom: 0;
    border-radius: 2px 2px 0 0;
  }

  .app-container {
    padding-bottom: 0;
    padding-top: 56px;
  }

  /* Catalog grid: 4 columns */
  .stone-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 16px 32px 40px;
    max-width: 1400px;
    margin: 0 auto;
  }

  .filter-bar {
    padding: 16px 32px;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
  }

  .search-wrapper {
    margin-bottom: 0;
    flex: 0 0 300px;
  }

  .filter-chips {
    flex: 1;
    overflow-x: visible;
    flex-wrap: wrap;
  }

  .results-info {
    padding: 10px 32px;
    max-width: 1400px;
    margin: 0 auto;
  }

  /* Stone Detail: centered modal */
  #stone-detail {
    top: 50%;
    max-height: 85vh;
    border-radius: var(--radius-lg);
    transform: translate(-50%, -50%) scale(0.95);
    opacity: 0;
    transition: transform var(--transition-base), opacity var(--transition-base);
  }

  #stone-detail.active {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }

  .detail-cta {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }

  /* Detail backdrop */
  .detail-backdrop {
    position: fixed;
    inset: 0;
    z-index: 790;
    background: var(--overlay-black);
    backdrop-filter: blur(4px);
    display: none;
  }

  .detail-backdrop.active {
    display: block;
    animation: fadeIn var(--transition-base) ease;
  }

  /* Hero: larger */
  .hero-logo-text {
    font-size: 88px;
  }

  .hero-tagline {
    font-size: 15px;
  }

  .hero-subtitle {
    font-size: 17px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

  /* Portfolio */
  .project-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px 40px;
  }

  .category-tabs {
    padding: 0 32px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .portfolio-header {
    padding: 32px 32px 0;
    max-width: 1200px;
    margin: 0 auto;
  }

  /* Contact */
  #contact-screen {
    max-width: 900px;
    padding: 40px 32px;
  }

  .contact-form {
    max-width: 500px;
  }

  .map-container iframe {
    height: 400px;
  }

  /* Stone card hover effects (desktop only) */
  .stone-card {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
  }

  .stone-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
  }
}

/* ============================================================
   Responsive: Large Desktop (1440px+)
   ============================================================ */
@media (min-width: 1440px) {
  .stone-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1600px;
  }

  .hero-logo-text {
    font-size: 100px;
  }

  .filter-bar {
    max-width: 1600px;
  }

  .results-info {
    max-width: 1600px;
  }

  .project-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 1400px;
  }
}

/* ============================================================
   Landscape Orientation Adjustments
   ============================================================ */
@media (orientation: landscape) and (max-height: 500px) {
  .hero {
    min-height: auto;
    padding: 24px;
  }

  .hero-logo-text {
    font-size: 40px;
  }

  .hero-subtitle {
    display: none;
  }

  .hero-cta-group {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ============================================================
   Print Styles
   ============================================================ */
@media print {
  .bottom-nav,
  .splash-screen,
  .detail-cta,
  #three-viewer {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .app-container {
    padding-bottom: 0;
  }

  .stone-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* ============================================================
   Reduced Motion
   ============================================================ */
@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;
  }
}

/* ============================================================
   Dark Mode Overrides (for system dark mode consistency)
   ============================================================ */
@media (prefers-color-scheme: light) {
  /* Force dark since this is a dark-themed app */
  :root {
    color-scheme: dark;
  }
}

/* ============================================================
   iOS / Notch Safety
   ============================================================ */
@supports (padding: max(0px)) {
  .bottom-nav {
    padding-bottom: max(0px, env(safe-area-inset-bottom));
    height: calc(var(--nav-height) + max(0px, env(safe-area-inset-bottom)));
  }

  .app-container {
    padding-bottom: calc(var(--nav-height) + max(0px, env(safe-area-inset-bottom)));
  }

  .detail-cta {
    padding-bottom: calc(16px + max(0px, env(safe-area-inset-bottom)));
  }
}

/* ============================================================
   Dynamic Stone Detail (generated by stone-detail.js)
   ============================================================ */
.detail-header {
  position: relative;
  min-height: 40px;
}

.gallery-images {
  display: flex;
  transition: transform var(--transition-base);
}

.gallery-image {
  min-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.detail-content .detail-name {
  font-family: var(--font-heading);
  font-size: 32px;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.detail-content .detail-origin {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.detail-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.detail-hardness {
  margin-bottom: 20px;
}

.hardness-value {
  float: right;
  font-size: 13px;
  font-weight: 600;
  color: var(--gold);
  margin-top: 6px;
}

.detail-uses {
  margin-bottom: 20px;
}

.uses-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.use-tag {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--secondary-dark);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.detail-description {
  margin-bottom: 24px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.detail-processing h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--gold);
  margin-bottom: 12px;
}

.processing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.processing-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  background: var(--secondary-dark);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  text-align: center;
  transition: border-color var(--transition-fast);
}

.processing-card:hover {
  border-color: var(--gold);
}

.processing-icon {
  font-size: 24px;
}

.processing-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
}

.processing-desc {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

.detail-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 0 40px;
}

.btn-3d {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px;
  border: 1.5px solid var(--gold);
  border-radius: var(--radius-full);
  color: var(--gold);
  font-size: 14px;
  font-weight: 600;
  background: transparent;
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.btn-3d:hover {
  background: var(--gold);
  color: var(--primary-dark);
}

.btn-whatsapp {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  background: #25D366;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  touch-action: manipulation;
}

.btn-whatsapp:hover {
  background: #1eba5a;
  box-shadow: 0 0 20px rgba(37, 211, 102, 0.3);
}

/* Stone card additional styles */
.stone-type-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 4px 10px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(26, 26, 26, 0.8);
  color: var(--gold);
  border-radius: var(--radius-full);
  backdrop-filter: blur(4px);
}

.stone-card-colors {
  display: flex;
  gap: 4px;
  margin-top: 6px;
}

.stone-color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
}

.filter-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 4px;
  vertical-align: middle;
  border: 1px solid var(--border-subtle);
}

.skeleton-placeholder {
  position: absolute;
  inset: 0;
  background: var(--secondary-dark);
  animation: shimmer 1.5s ease infinite;
}

/* ============================================================
   Contact Screen Additional Styles
   ============================================================ */
.contact-content {
  padding: 0 16px 40px;
}

.contact-card {
  background: var(--secondary-dark);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
  border: 1px solid var(--border-subtle);
}

.contact-card-header {
  text-align: center;
  margin-bottom: 20px;
}

.contact-logo {
  margin-bottom: 8px;
}

.contact-logo-mk {
  font-family: var(--font-heading);
  font-size: 32px;
  color: var(--white);
  letter-spacing: 0.1em;
}

.contact-logo-design {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--gold);
  letter-spacing: 0.15em;
  margin-left: 4px;
}

.contact-card-header h3 {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

.contact-brand {
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 2px;
}

.contact-phone-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.wa-mini {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: #25D366;
  color: #fff;
  border-radius: 50%;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.wa-mini:hover {
  background: #1eba5a;
  transform: scale(1.1);
}


.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.contact-info-item svg {
  flex-shrink: 0;
  color: var(--gold);
  margin-top: 2px;
}

.contact-info-item .info-label {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-info-item .info-value {
  display: block;
  font-size: 14px;
  color: var(--white);
}

.info-link {
  text-decoration: none;
  color: var(--white);
  transition: color var(--transition-fast);
}

.info-link:hover {
  color: var(--gold);
}

.contact-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.working-hours {
  margin-bottom: 32px;
}

.working-hours h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.hours-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hours-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--secondary-dark);
  border-radius: var(--radius-sm);
}

.hours-day {
  font-size: 14px;
  color: var(--white);
}

.hours-time {
  font-size: 14px;
  color: var(--gold);
  font-weight: 600;
}

.hours-row.closed .hours-time {
  color: var(--text-muted);
}

.contact-map {
  margin-bottom: 32px;
}

.contact-map h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.contact-form h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--secondary-dark);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--white);
  font-size: 14px;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
  font-weight: 300;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.15);
}

.form-group textarea {
  min-height: 110px;
  resize: vertical;
}

.form-submit-btn {
  width: 100%;
  padding: 16px;
  background: var(--gold);
  color: var(--primary-dark);
  font-size: 15px;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-full);
  touch-action: manipulation;
  transition: all var(--transition-fast);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 4px;
}

.form-submit-btn:hover {
  background: var(--gold-hover);
  box-shadow: 0 0 24px var(--gold-glow);
}

.form-submit-btn svg {
  flex-shrink: 0;
}

/* Screen subtitle */
.screen-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 300;
  margin-top: 4px;
}

/* ============================================================
   Obrada (Processing Videos) Screen
   ============================================================ */
#obrada-screen {
  padding-top: 0;
}

.obrada-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 0 16px 40px;
}

.obrada-card {
  background: var(--secondary-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition-fast);
}

.obrada-card:hover {
  border-color: var(--gold);
}

.obrada-video {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  background: #000;
}

.obrada-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
  color: var(--text-muted);
}

.video-placeholder svg {
  color: var(--gold);
  opacity: 0.5;
}

.video-placeholder p {
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}

.obrada-card-body {
  padding: 16px;
}

.obrada-card-body h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
  color: var(--white);
}

.obrada-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.obrada-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--gold-subtle);
  color: var(--gold);
  letter-spacing: 0.02em;
}

@media (min-width: 768px) {
  .obrada-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   Reference Screen
   ============================================================ */
#reference-screen {
  padding-top: 0;
}

.reference-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 0 16px 40px;
}

.reference-card {
  background: var(--secondary-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.reference-cover {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.reference-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.reference-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
  color: var(--text-muted);
}

.reference-cover-placeholder svg {
  color: var(--gold);
  opacity: 0.4;
}

.reference-cover-placeholder p {
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}

.reference-body {
  padding: 20px;
}

.reference-body h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
  color: var(--white);
}

.reference-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}

.reference-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.reference-meta-item svg {
  color: var(--gold);
  flex-shrink: 0;
}

.reference-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.reference-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.reference-detail-item {
  background: var(--primary-dark);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

.reference-detail-item .detail-label {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.reference-detail-item .detail-value {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
}

.reference-gallery-placeholder {
  padding: 24px;
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-sm);
  text-align: center;
}

.reference-gallery-placeholder p {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

@media (min-width: 768px) {
  .reference-details {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .reference-list {
    max-width: 800px;
    margin: 0 auto;
  }
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 24px 16px;
  padding-bottom: calc(24px + var(--nav-height) + var(--safe-bottom));
  border-top: 1px solid var(--border-subtle);
  margin-top: 20px;
}

.app-footer p {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1.6;
}

/* Screen header */
.screen-header {
  padding: 24px 16px 16px;
}

.screen-header h2 {
  font-family: var(--font-heading);
  font-size: 28px;
  letter-spacing: 0.06em;
}

/* Splash screen MK DESIGN text styles */
.splash-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.splash-logo-img {
  width: 200px;
  height: auto;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 4px 20px rgba(212, 175, 55, 0.2));
}

.hero-logo-img {
  width: 300px;
  height: auto;
  display: block;
  margin: 0 auto 12px;
  filter: drop-shadow(0 4px 24px rgba(212, 175, 55, 0.25));
}

.contact-logo-img {
  width: 120px;
  height: auto;
  display: block;
  margin: 0 auto 12px;
  filter: drop-shadow(0 2px 12px rgba(212, 175, 55, 0.15));
}

/* Portfolio project grid */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 0 16px 40px;
}

@media (min-width: 768px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .processing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* App container visibility */
.app-container {
  opacity: 0;
  transition: opacity 0.3s ease;
}

.app-container.visible {
  opacity: 1;
}

/* Nav item SVG icons */
.nav-item svg {
  width: 20px;
  height: 20px;
  transition: color var(--transition-fast);
}

.nav-item.active svg {
  color: var(--gold);
}

/* Project card overlay */
.project-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(to top, rgba(26, 26, 26, 0.9) 0%, transparent 100%);
}

.project-card-title {
  font-family: var(--font-heading);
  font-size: 18px;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.project-card-stone {
  font-size: 12px;
  color: var(--text-muted);
}

.project-card-category {
  display: inline-block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gold);
  margin-top: 4px;
}

/* Project detail overlay */
#project-detail {
  position: fixed;
  inset: 0;
  z-index: 950;
  background: var(--primary-dark);
  overflow: hidden;
  transform: translateY(100%);
  visibility: hidden;
}

#project-detail.active {
  transform: translateY(0);
  visibility: visible;
}

#project-detail > .detail-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 820;
}

#project-detail > .detail-scroll-content {
  height: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Gallery track for project detail */
#project-detail .gallery-track,
#project-gallery .gallery-track {
  display: flex;
  transition: transform var(--transition-base);
}

.gallery-slide {
  min-width: 100%;
  aspect-ratio: 4 / 3;
}

.gallery-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery-prev,
.gallery-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(26, 26, 26, 0.7);
  color: var(--white);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  border: 1px solid var(--border-subtle);
  z-index: 5;
  touch-action: manipulation;
}

.gallery-prev { left: 12px; }
.gallery-next { right: 12px; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  margin: 16px 0 8px;
  color: var(--white);
}

.empty-state svg {
  color: var(--text-muted);
  opacity: 0.5;
}

/* Clickable info value */
.info-value.clickable {
  color: var(--gold);
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

/* Splash retry */
.splash-retry {
  margin-top: 30px;
  text-align: center;
}

.splash-retry p {
  color: var(--text-muted);
  margin-bottom: 12px;
  font-size: 14px;
}

.splash-retry button {
  padding: 10px 24px;
  background: var(--gold);
  color: var(--primary-dark);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
}