/**
 * GoToolstack — UI Components & Design System
 * Stripe/Apple Standard Inputs, Cards, Buttons, and Modals.
 */

/* Navigation Components */
.searchbox {
  position: relative;
  margin-bottom: 16px;
}

.searchbox input {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 12px 10px 34px;
  font-size: 0.84rem;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

[dir="rtl"] .searchbox input {
  padding: 10px 34px 10px 12px;
}

.searchbox input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-glow);
  outline: none;
}

.searchbox svg {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted-2);
  pointer-events: none;
}

[dir="rtl"] .searchbox svg {
  left: auto;
  right: 11px;
}

.home-nav {
  display: flex !important;
  align-items: center !important;
  justify-content: flex-start !important;
  gap: 10px !important;
  width: 100% !important;
  padding: 10px 14px !important;
  border-radius: var(--radius-sm) !important;
  background: var(--brand-dim) !important;
  color: var(--brand) !important;
  font-weight: 700 !important;
  font-size: 0.88rem !important;
  border: 1px solid rgba(0, 85, 255, 0.2) !important;
  cursor: pointer !important;
  margin-bottom: 16px !important;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.home-nav:hover {
  background: var(--brand) !important;
  color: #FFFFFF !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--brand-glow);
}

.navcat {
  margin-bottom: 6px !important;
}

.navcat-label {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  width: 100% !important;
  padding: 8px 10px !important;
  border-radius: var(--radius-sm) !important;
  background: transparent !important;
  color: var(--text) !important;
  font-weight: 700 !important;
  font-size: 0.85rem !important;
  border: 1px solid transparent !important;
  cursor: pointer !important;
  text-transform: none !important;
  letter-spacing: -0.01em !important;
  transition: all 0.15s ease !important;
  text-align: left !important;
  gap: 8px !important;
}

[dir="rtl"] .navcat-label {
  text-align: right !important;
}

.navcat-label .cat-info {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  flex: 1 !important;
  min-width: 0 !important;
  text-align: left !important;
}

[dir="rtl"] .navcat-label .cat-info {
  text-align: right !important;
}

.navcat-label .cat-icon {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex-shrink: 0 !important;
  width: 18px !important;
  height: 18px !important;
}

.navcat-label .cat-text {
  flex: 1 !important;
  min-width: 0 !important;
  font-size: 0.85rem !important;
  line-height: 1.25 !important;
  text-align: left !important;
  word-break: break-word !important;
}

[dir="rtl"] .navcat-label .cat-text {
  text-align: right !important;
}

.navcat-label .cat-arrow {
  flex-shrink: 0 !important;
  align-self: center !important;
}

.navcat-label:hover {
  background: var(--panel-2) !important;
  color: var(--brand) !important;
}

.navcat-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 2px 0 4px 6px;
  margin-left: 10px;
  border-left: 1px solid var(--line);
}

[dir="rtl"] .navcat-items {
  padding: 2px 6px 4px 0;
  margin-left: 0;
  margin-right: 10px;
  border-left: none;
  border-right: 1px solid var(--line);
}

.navcat-items .navitem {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  text-align: left !important;
  width: 100% !important;
  padding: 6px 10px !important;
  border-radius: var(--radius-sm) !important;
  background: transparent !important;
  color: var(--muted) !important;
  font-size: 0.83rem !important;
  font-weight: 500 !important;
  border: none !important;
  margin: 0 !important;
  cursor: pointer !important;
  transition: all 0.15s ease !important;
  line-height: 1.25 !important;
  word-break: break-word !important;
}

[dir="rtl"] .navcat-items .navitem {
  text-align: right !important;
}

.navcat-items .navitem:hover {
  background: var(--panel-2) !important;
  color: var(--text) !important;
}

.navcat-items .navitem.active {
  background: var(--brand-dim) !important;
  color: var(--brand) !important;
  font-weight: 700 !important;
}

.navitem .ico {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 18px !important;
  height: 18px !important;
  min-width: 18px !important;
  flex-shrink: 0 !important;
  font-size: 0.95rem !important;
}

.navitem span:not(.ico) {
  flex: 1 !important;
  min-width: 0 !important;
  text-align: left !important;
  line-height: 1.25 !important;
}

[dir="rtl"] .navitem span:not(.ico) {
  text-align: right !important;
}

/* Top Search with Dropdown */
.top-search input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 10px 16px 10px 38px;
  font-size: 0.88rem;
  color: var(--text);
  box-shadow: var(--shadow-xs);
  transition: all 0.2s ease;
}

[dir="rtl"] .top-search input {
  padding: 10px 38px 10px 16px;
}

.top-search input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-glow);
  outline: none;
}

.top-search svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted-2);
  pointer-events: none;
}

[dir="rtl"] .top-search svg {
  left: auto;
  right: 14px;
}

.search-wrapper-rel {
  position: relative;
  width: 100%;
  flex: 1;
}

.search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-height: 420px;
  overflow-y: auto;
  z-index: 9999;
  display: none;
  flex-direction: column;
}

.search-dd-item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
  text-align: left;
  transition: background 0.12s ease;
}

[dir="rtl"] .search-dd-item {
  text-align: right;
}

.search-dd-item:last-child {
  border-bottom: none;
}

.search-dd-item:hover, .search-dd-item.highlighted {
  background: var(--panel-2);
}

.search-dd-item .icon,
.search-dd-item .search-dd-icon,
.search-result-icon {
  width: 38px !important;
  height: 38px !important;
  min-width: 38px !important;
  border-radius: var(--radius-sm) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex-shrink: 0 !important;
}

.search-dd-item .icon svg,
.search-dd-item .search-dd-icon svg,
.search-dd-item .tool-svg-icon,
.search-result-icon svg {
  width: 20px !important;
  height: 20px !important;
  min-width: 20px !important;
  stroke: currentColor !important;
  fill: none !important;
  display: block !important;
}

.search-dd-item .texts {
  display: flex;
  flex-direction: column;
}

.search-dd-item .title {
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--text);
  margin-bottom: 2px;
}

.search-dd-item .cat {
  font-size: 0.74rem;
  color: var(--muted-2);
  font-weight: 600;
}

.search-dd-empty {
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 768px) {
  .search-dropdown {
    position: fixed !important;
    top: 70px !important;
    left: 4% !important;
    right: 4% !important;
    width: 92% !important;
    max-height: 65vh !important;
    z-index: 999999 !important;
  }
}

/* Modern Buttons (Stripe Style) */
.btn {
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-weight: 600;
  font-size: 0.86rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn:hover {
  background: var(--panel-2);
  border-color: var(--muted-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: linear-gradient(135deg, var(--cat-color, var(--brand)) 0%, var(--brand-2) 100%);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 4px 14px var(--brand-glow);
}

.btn.primary:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--brand-glow);
}

.btn.sm {
  padding: 6px 12px;
  font-size: 0.78rem;
  border-radius: 8px;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.hero-btn {
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-btn-primary {
  background: var(--brand);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 4px 16px var(--brand-glow);
}

.hero-btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 8px 24px var(--brand-glow);
}

.hero-btn-secondary {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-xs);
}

.hero-btn-secondary:hover {
  border-color: var(--brand);
  color: var(--brand);
  transform: translateY(-2px);
  background: var(--brand-dim);
}

.icon-btn {
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-weight: 600;
  font-size: 0.82rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.icon-btn:hover {
  border-color: var(--brand);
  background: var(--panel-2);
}

.lang-select, #languageSelect {
  background-color: var(--panel) !important;
  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='%2364748B' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") !important;
  background-repeat: no-repeat !important;
  background-position: right 10px center !important;
  background-size: 11px !important;
  -webkit-appearance: none !important;
  -moz-appearance: none !important;
  appearance: none !important;
  border: 1px solid var(--line) !important;
  border-radius: var(--radius-sm) !important;
  padding: 8px 30px 8px 12px !important;
  font-family: inherit !important;
  font-size: 0.84rem !important;
  font-weight: 600 !important;
  color: var(--text) !important;
  cursor: pointer !important;
  box-shadow: var(--shadow-xs) !important;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
  display: inline-flex !important;
  align-items: center !important;
  line-height: 1.2 !important;
  visibility: visible !important;
  opacity: 1 !important;
}

[dir="rtl"] .lang-select, [dir="rtl"] #languageSelect {
  background-position: left 10px center !important;
  padding: 8px 12px 8px 30px !important;
}

.lang-select:hover, #languageSelect:hover {
  border-color: var(--brand) !important;
  background-color: var(--panel-2) !important;
  transform: translateY(-1px);
}

.lang-select:focus, #languageSelect:focus {
  border-color: var(--brand) !important;
  box-shadow: 0 0 0 3px var(--brand-glow) !important;
  outline: none !important;
}

/* Tool Cards (Stripe Surface Polish) */
.tool-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-xs);
  position: relative;
}

[dir="rtl"] .tool-card {
  text-align: right;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--card-color, var(--brand));
}

.tool-card .icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  background: var(--card-dim, var(--brand-dim));
}

.tool-card .tname {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
  line-height: 1.35;
}

.tool-card .tsub {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

.tool-card .card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 6px;
}

.tool-card .arrow {
  font-size: 0.82rem;
  color: var(--card-color, var(--brand));
  font-weight: 700;
}

.tool-card .fav-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--muted-2);
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: transform 0.2s ease, color 0.2s ease, background-color 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.tool-card .fav-btn:hover {
  transform: scale(1.15);
  color: var(--warn);
  background: var(--warn-dim);
}

.tool-card .fav-btn.active {
  color: #F59E0B;
  fill: #F59E0B;
}

.tool-card .fav-btn svg {
  width: 18px;
  height: 18px;
}

/* Tool Header & Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--muted);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb a:hover {
  color: var(--brand);
}

.breadcrumb a svg {
  width: 14px;
  height: 14px;
}

.breadcrumb .cur {
  color: var(--text);
  font-weight: 700;
}

.tool-head {
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.tool-title {
  font-size: 2rem;
  font-weight: 800;
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 12px;
  line-height: 1.25;
}

.tool-title .ticon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  background: var(--cat-dim, var(--brand-dim));
  flex-shrink: 0;
}

.tool-sub {
  color: var(--muted);
  font-size: 0.96rem;
  max-width: 650px;
  margin: 0;
  line-height: 1.55;
}

.tool-head-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ok);
  background: var(--ok-dim);
  border: 1px solid rgba(16, 185, 129, 0.2);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
}

.tool-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 900px) {
  .tool-columns {
    grid-template-columns: 1fr;
  }
}

/* Card & Panels */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.card-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.02rem;
  margin-bottom: 18px;
  color: var(--text);
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.grid3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

@media (max-width: 600px) {
  .grid2, .grid3 {
    grid-template-columns: 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.field label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.field input[type=text],
.field input[type=number],
.field input[type=date],
.field input[type=datetime-local],
.field input[type=time],
.field input[type=color],
.field select,
.field textarea {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: 0.92rem;
  color: var(--text);
  width: 100%;
  transition: all 0.15s ease;
}

.field textarea {
  resize: vertical;
  min-height: 110px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.86rem;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--cat-color, var(--brand));
  box-shadow: 0 0 0 3px var(--brand-glow);
  outline: none;
}

.field-currency {
  position: relative;
}

.field-currency .cur-sym {
  position: absolute;
  left: 14px;
  top: 36px;
  font-size: 0.92rem;
  color: var(--muted);
  font-weight: 600;
  pointer-events: none;
}

[dir="rtl"] .field-currency .cur-sym {
  left: auto;
  right: 14px;
}

.field-currency input {
  padding-left: 28px !important;
}

[dir="rtl"] .field-currency input {
  padding-left: 14px !important;
  padding-right: 28px !important;
}

.checkline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.88rem;
  cursor: pointer;
  color: var(--text-secondary);
}

/* Result Panel */
.result-panel {
  background: linear-gradient(180deg, var(--panel) 0%, var(--cat-dim, var(--brand-dim)) 260%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow-sm);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
}

.result-item .k {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.result-item .v {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.result-item .v.warn {
  color: var(--warn);
}

.status-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  color: var(--muted-2);
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.status-strip .sdot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ok);
}

.notice {
  font-size: 0.84rem;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--panel-2);
  line-height: 1.55;
}

.notice.error {
  border-color: rgba(239, 68, 68, 0.3);
  background: var(--danger-dim);
  color: #DC2626;
}

.notice.ok {
  border-color: rgba(16, 185, 129, 0.3);
  background: var(--ok-dim);
  color: #059669;
}

.notice.warn {
  border-color: rgba(245, 158, 11, 0.3);
  background: var(--warn-dim);
  color: #D97706;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.tab {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  font-size: 0.84rem;
  cursor: pointer;
  transition: all 0.15s ease;
  font-weight: 500;
}

.tab.active {
  background: var(--cat-dim, var(--brand-dim));
  color: var(--cat-color, var(--brand));
  border-color: var(--cat-color, var(--brand));
  font-weight: 700;
}

/* Modals & Toast */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  padding: 20px;
}

.modal-overlay.show {
  display: flex;
}

.modal-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  max-width: 560px;
  width: 100%;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  animation: modalScaleIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalScaleIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 600;
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100000;
  pointer-events: none;
  box-shadow: var(--shadow-md);
}

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

.fade-in {
  animation: fadeIn 0.22s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Global Search Shortcut Badge --- */
.search-kbd-badge {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px 7px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted-2);
  background: var(--surface2);
  border: 1px solid var(--line);
  border-radius: 6px;
  pointer-events: none;
  transition: all 0.15s ease;
}

[dir="rtl"] .search-kbd-badge {
  right: auto;
  left: 12px;
}

.top-search input:focus + .search-kbd-badge,
.top-search:focus-within .search-kbd-badge {
  color: var(--brand);
  border-color: var(--brand);
  background: var(--brand-dim);
}

@media (max-width: 640px) {
  .search-kbd-badge {
    display: none;
  }
}

/* --- Floating Back to Top Button --- */
.back-to-top-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

[dir="rtl"] .back-to-top-btn {
  right: auto;
  left: 28px;
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background: var(--brand);
  color: #FFFFFF;
  border-color: var(--brand);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--brand-glow);
}

.back-to-top-btn:active {
  transform: translateY(0);
}