/* ===========================================
   COMPONENTS - Buttons, Cards, Slider, Toast, Loading
   =========================================== */

/* ---- Skip Link ---- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-light);
  z-index: 100000;
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  top: 10px;
  left: 10px;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: var(--fs-body);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  background: none;
  color: inherit;
}

.btn--nav {
  background-color: rgba(255,255,255,0.1);
  color: var(--color-text-light);
  font-size: 14px;
  position: relative;
}
.btn--nav:hover {
  background-color: rgba(255,0,0,0.2);
  box-shadow: var(--shadow-red);
}
.btn--nav:hover::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  width: 100%;
  height: 2px;
  background-color: rgba(255,0,0,0.7);
  border-radius: 2px;
}
.btn--nav.active {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.btn--drop {
  background: none;
  color: var(--color-text-light);
  font-size: 15px;
  padding: 10px 15px;
  width: 100%;
  justify-content: flex-start;
}
.btn--drop:hover {
  background-color: rgba(255,0,0,0.2);
  color: var(--color-primary);
}
.btn--drop.active {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.btn--lang {
  background-color: rgba(255,255,255,0.1);
  color: var(--color-text-light);
  font-size: 14px;
}
.btn--lang:hover {
  background-color: rgba(255,0,0,0.2);
}

.btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-text {
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-red-gradient);
  color: var(--color-text-light);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-weight: bold;
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover {
  box-shadow: var(--shadow-red);
  transform: translateY(-1px);
}

/* ---- Cards ---- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow:
    0 2px 10px rgba(0,0,0,0.3),
    0 1px 3px rgba(0,0,0,0.2);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer;
  border: 1px solid rgba(200,16,46,0.08);
  position: relative;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(200,16,46,0.1) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow:
    0 15px 40px rgba(0,0,0,0.4),
    0 5px 15px rgba(0,0,0,0.3),
    0 0 0 1px rgba(200,16,46,0.2);
}
.card:hover::before {
  opacity: 1;
}
.card--product {
  text-align: center;
  padding: var(--space-lg);
}
.card--product.active {
  border: 2px solid var(--color-primary);
  box-shadow: 0 8px 30px rgba(200,16,46,0.2);
}

.product-image {
  width: 100%;
  max-height: 200px;
  object-fit: contain;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  transition: transform 0.4s ease;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}
.card--product:hover .product-image {
  transform: scale(1.05);
}
/* Remove shadow/border from Industrial Gear Oil so it blends into card */
.product-image[alt="Industrial Gear Oil"],
.product-image[data-src*="Industrial_Gear_Oil"] {
  filter: none;
  border-radius: 0;
}

.product-name {
  font-size: var(--fs-h3);
  color: var(--color-text-dark);
  font-weight: 700;
  letter-spacing: 0.3px;
  transition: color 0.3s ease;
}
.card--product:hover .product-name {
  color: var(--color-primary);
}

/* ---- Product Detail View ---- */
.product-detail-view {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-xl);
  animation: fadeInUp 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.product-detail-image {
  flex: 0 0 320px;
  text-align: center;
}
.product-detail-image img {
  width: 100%;
  max-width: 320px;
  border-radius: var(--radius-lg);
  box-shadow:
    0 8px 30px rgba(0,0,0,0.4),
    0 2px 8px rgba(0,0,0,0.3);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.product-detail-image img:hover {
  transform: scale(1.03);
  box-shadow:
    0 12px 40px rgba(0,0,0,0.5),
    0 0 20px rgba(200,16,46,0.3);
}
.product-detail-info {
  flex: 1;
}
.product-detail-name {
  font-size: var(--fs-h1);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  position: relative;
  padding-bottom: var(--space-sm);
}
.product-detail-name::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--color-red-gradient);
  border-radius: 2px;
}
.product-detail-description {
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--color-text);
}
.product-detail-description p {
  margin-bottom: var(--space-md);
}

.back-to-products {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-md);
  padding: 8px 16px;
  background: var(--color-header-bg);
  color: var(--color-text-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--fs-small);
  transition: all var(--transition-normal);
  border: none;
}
.back-to-products:hover {
  box-shadow: var(--shadow-red);
  transform: translateY(-1px);
}

/* ---- Slider ---- */
.slider {
  --items-per-view: 3;
  position: relative;
  width: 100%;
  margin: 0;
  user-select: none;
  -webkit-user-select: none;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, #111118 0%, #0d0d15 100%);
  border: 1px solid rgba(200,16,46,0.1);
  box-shadow:
    inset 0 2px 4px rgba(0,0,0,0.2),
    0 1px 3px rgba(0,0,0,0.3);
}

/* Overflow wrapper — the track slides inside */
.slider__track {
  display: flex;
  gap: 20px;
  transition: transform 0.55s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: transform;
  cursor: grab;
  padding: 24px 20px;
}
.slider__track:active {
  cursor: grabbing;
}

.slider__item {
  flex: 0 0 calc(100% / var(--items-per-view) - 20px + 20px / var(--items-per-view));
  min-width: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  position: relative;
  background: var(--color-surface-elevated);
  box-shadow:
    0 2px 12px rgba(0,0,0,0.3),
    0 1px 3px rgba(0,0,0,0.2);
  transition: transform 0.4s cubic-bezier(0.22, 0.61, 0.36, 1),
              box-shadow 0.4s ease;
  border: 1px solid rgba(200,16,46,0.06);
}
.slider__item:hover {
  transform: translateY(-5px);
  box-shadow:
    0 16px 40px rgba(0,0,0,0.4),
    0 6px 12px rgba(0,0,0,0.3),
    0 0 0 1px rgba(200,16,46,0.15);
}

.slider__image {
  width: 100%;
  height: 240px;
  object-fit: contain;
  padding: 20px;
  display: block;
  transition: transform 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
  -webkit-user-drag: none;
  pointer-events: none;
}
.slider__item:hover .slider__image {
  transform: scale(1.06);
}

/* Navigation arrows — semi-transparent, glass-effect buttons */
.slider__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(17,17,24,0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid rgba(200,16,46,0.15);
  box-shadow:
    0 2px 12px rgba(0,0,0,0.3),
    0 1px 3px rgba(0,0,0,0.2);
  transition: all 0.25s cubic-bezier(0.22, 0.61, 0.36, 1);
  opacity: 0;
}
.slider:hover .slider__nav {
  opacity: 1;
}
.slider__nav:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: transparent;
  box-shadow:
    0 4px 20px rgba(200,16,46,0.35),
    0 2px 6px rgba(200,16,46,0.15);
  transform: translateY(-50%) scale(1.08);
}
.slider__nav:active {
  transform: translateY(-50%) scale(0.95);
}
.slider__nav svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  stroke-width: 2.5;
}
.slider__nav--prev { left: 12px; }
.slider__nav--next { right: 12px; }

/* Dot indicators — below slider, not absolute */
.slider__dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--space-md) 0 var(--space-sm);
}

.slider__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: all 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.slider__dot:hover {
  background: rgba(200,16,46,0.5);
  transform: scale(1.3);
}
.slider__dot.active {
  width: 24px;
  border-radius: 4px;
  background: var(--color-primary);
  box-shadow: 0 2px 8px rgba(200,16,46,0.3);
}

.slider__counter {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
  margin-right: 6px;
  font-variant-numeric: tabular-nums;
}

/* ---- Loading Overlay ---- */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, #111118 0%, #0a0a0f 70%);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 99999;
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              visibility 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* Logo wrapper with glow behind */
.loading-logo-wrap {
  position: relative;
  width: 140px;
  height: 140px;
}

/* Red ambient glow behind logo */
.loading-logo-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200%;
  height: 200%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(200,16,46,0.25) 0%, rgba(200,16,46,0.08) 40%, transparent 70%);
  animation: loadingGlowPulse 2.5s ease-in-out infinite;
  pointer-events: none;
}

/* Logo image — fade in + scale up + continuous breathing */
.loading-logo {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: contain;
  animation: logoEntrance 1s cubic-bezier(0.16, 1, 0.3, 1) forwards,
             logoBreathing 2.5s ease-in-out 1.2s infinite;
  opacity: 0;
  filter: drop-shadow(0 0 20px rgba(200,16,46,0.5));
}

.loading-brand-text {
  color: #ffffff;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 8px;
  text-transform: uppercase;
  animation: logoBrandReveal 2s ease 0.8s both;
  text-shadow: 0 0 15px rgba(200,16,46,0.25),
               0 2px 8px rgba(0,0,0,0.3);
}

.loading-bar-container {
  width: 280px;
  height: 3px;
  background: rgba(255,255,255,0.06);
  border-radius: 2px;
  overflow: hidden;
  animation: fadeInUp 0.6s ease 0.6s both;
}

.loading-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #c8102e, #ff4444, #c8102e);
  background-size: 200% 100%;
  border-radius: 2px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  animation: shimmer 1.5s infinite linear;
  box-shadow: 0 0 10px rgba(200,16,46,0.5);
}

.loading-percentage {
  color: rgba(255,100,100,0.9);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  font-variant-numeric: tabular-nums;
  animation: fadeInUp 0.6s ease 0.8s both;
}

.loading-subtext {
  color: rgba(255,255,255,0.35);
  font-size: 11px;
  text-align: center;
  max-width: 300px;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: fadeInUp 0.6s ease 1s both;
}

/* ---- Toast ---- */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-md);
  color: var(--color-text-light);
  font-size: var(--fs-small);
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.3s ease;
  max-width: 350px;
  word-wrap: break-word;
}
.toast--success { background: #2e7d32; }
.toast--error { background: #c62828; }
.toast--info { background: var(--color-secondary); }
.toast--warning { background: #ef6c00; }
.toast.toast--hiding {
  animation: fadeOutDown 0.3s ease forwards;
}

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(17,17,24,0.9), rgba(22,22,34,0.9));
  backdrop-filter: blur(8px);
  color: var(--color-text-light);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid rgba(200,16,46,0.2);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 9999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: linear-gradient(135deg, rgba(200,16,46,0.9), rgba(230,57,70,0.9));
  box-shadow: 0 6px 25px rgba(200,16,46,0.4);
  transform: translateY(-4px);
  border-color: rgba(255,255,255,0.2);
}

/* ---- Section Link ---- */
.section-link {
  display: inline-block;
  background: linear-gradient(135deg, #c8102e 0%, #e63946 100%);
  color: var(--color-text-light) !important;
  padding: 10px 28px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--fs-small);
  letter-spacing: 0.5px;
  margin-top: var(--space-md);
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(200,16,46,0.3);
  position: relative;
  overflow: hidden;
}
.section-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}
.section-link:hover {
  box-shadow: 0 6px 25px rgba(200,16,46,0.45);
  transform: translateY(-2px);
}
.section-link:hover::before {
  left: 100%;
}

/* ---- Accordion ---- */
.accordion-item {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.accordion-header {
  padding: 12px 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: bold;
  color: var(--color-text-dark);
  transition: background var(--transition-normal);
}
.accordion-header:hover {
  background: rgba(200,16,46,0.1);
}
.accordion-header .arrow {
  transition: transform var(--transition-normal);
  font-size: 12px;
}
.accordion-item.open .accordion-header .arrow {
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 16px;
}
.accordion-item.open .accordion-body {
  max-height: 800px;
  padding: 0 16px 12px;
}

/* ---- Oil Property Styles ---- */
.oil-card {
  background: linear-gradient(135deg, var(--color-surface-elevated) 0%, var(--color-surface) 100%);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin: var(--space-sm) 0;
  border-left: 4px solid var(--color-primary);
}
.oil-card-name {
  font-weight: bold;
  color: var(--color-primary);
  font-size: var(--fs-h3);
  cursor: pointer;
  display: inline-block;
  transition: color var(--transition-fast);
}
.oil-card-name:hover {
  color: var(--color-primary-dark);
}

.oil-property {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 4px 0;
  font-size: var(--fs-small);
}
.oil-property-label {
  font-weight: 600;
  color: var(--color-text);
  min-width: 120px;
}
.oil-property-value {
  color: var(--color-text-muted);
}
.oil-img {
  width: 60px;
  height: 60px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

/* ---- Vehicle Info Card ---- */
.vehicle-info-card {
  background: var(--color-turquoise-bg);
  color: var(--color-text-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-md);
}
.vehicle-info-card h3 {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-md);
}
.vehicle-info-row {
  display: flex;
  gap: var(--space-sm);
  padding: 4px 0;
  font-size: var(--fs-body);
}
.vehicle-info-label {
  font-weight: bold;
  min-width: 100px;
}

/* ---- Oil Finder Specific ---- */
.oil-finder-loading {
  text-align: center;
  padding: var(--space-xl);
  color: var(--color-text-muted);
  font-size: var(--fs-body);
}

.oil-finder-loading .spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(200,16,46,0.2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--space-md);
}

/* ---- Mobile Language Select ---- */
.mobile-lang-select {
  background-color: var(--color-surface);
  color: var(--color-text);
  border: 1px solid rgba(200,16,46,0.15);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
  width: 100%;
  appearance: none;
  margin: 8px 15px;
}

/* ---- Content transitions ---- */
.content--loading {
  opacity: 0;
  transition: opacity 0.15s ease;
}
.content--ready {
  opacity: 1;
  transition: opacity 0.3s ease;
}