/**
 * Modern Link & Utility Platform
 * Custom Theme & Design System (Bootstrap 5.3 Extension)
 */

:root,
[data-bs-theme="light"] {
  --app-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --app-bg: #f8fafc;
  --app-surface: #ffffff;
  --app-surface-subtle: #f8fafc;
  --app-border: #e2e8f0;
  --app-border-focus: #6366f1;
  --app-text-primary: #0f172a;
  --app-text-secondary: #475569;
  --app-text-muted: #64748b;
  --app-primary: #4f46e5;
  --app-primary-hover: #4338ca;
  --app-primary-subtle: #e0e7ff;
  --app-primary-text: #3730a3;
  --app-success: #10b981;
  --app-success-subtle: #d1fae5;
  --app-danger: #ef4444;
  --app-warning: #f59e0b;
  --app-card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --app-card-shadow-hover: 0 14px 28px -4px rgba(0, 0, 0, 0.08), 0 0 0 1px #6366f1;
  --app-sidebar-bg: #ffffff;
  --app-header-bg: #ffffff;
  --app-hero-bg: #eef2f7;
  --app-hero-title-color: #0f172a;
  --app-hero-desc-color: #334155;

  /* Shortener Tool Theme Variables (Light Mode) */
  --shortener-card-bg: #ffffff;
  --shortener-card-border: #e2e8f0;
  --shortener-card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shortener-heading-color: #0f172a;
  --shortener-label-color: #334155;
  --shortener-subtext-color: #64748b;
  --shortener-input-bg: #f8fafc;
  --shortener-input-border: #cbd5e1;
  --shortener-input-color: #0f172a;
  --shortener-input-placeholder: #94a3b8;
  --shortener-input-focus-border: #6366f1;
  --shortener-input-icon-color: #94a3b8;
  --shortener-rule-container-bg: #f8fafc;
  --shortener-rule-container-border: #e2e8f0;
  --shortener-rule-badge-bg: #e0e7ff;
  --shortener-rule-badge-color: #4338ca;
  --shortener-rule-badge-border: #c7d2fe;
  --shortener-rule-card-bg: #ffffff;
  --shortener-rule-card-border: #e2e8f0;
  --shortener-rule-card-hover: #f1f5f9;
  --shortener-rule-card-active-bg: #eef2ff;
  --shortener-rule-card-active-border: #6366f1;
  --shortener-rule-card-active-shadow: 0 0 0 1px #6366f1, 0 4px 14px rgba(99, 102, 241, 0.15);
  --shortener-rule-icon-bg: #e0e7ff;
  --shortener-rule-icon-color: #4f46e5;
  --shortener-rule-icon-active-bg: #4f46e5;
  --shortener-rule-icon-active-color: #ffffff;
  --shortener-badge-active-bg: #4f46e5;
  --shortener-badge-active-color: #ffffff;
  --shortener-subpanel-bg: #ffffff;
  --shortener-subpanel-border: #e2e8f0;
  --shortener-subpanel-header-color: #475569;
  --shortener-subpanel-display-color: #4f46e5;
  --shortener-num-input-bg: #f8fafc;
  --shortener-num-input-border: #cbd5e1;
  --shortener-num-input-color: #0f172a;
  --shortener-preset-bg: #f1f5f9;
  --shortener-preset-border: #cbd5e1;
  --shortener-preset-color: #475569;
  --shortener-preset-hover-bg: #e2e8f0;
  --shortener-preset-hover-color: #0f172a;
  --shortener-preset-active-bg: #4f46e5;
  --shortener-preset-active-border: #4f46e5;
  --shortener-preset-active-color: #ffffff;
  --shortener-slider-track: #e2e8f0;
  --shortener-info-bg: #f1f5f9;
  --shortener-info-border: #e2e8f0;
  --shortener-info-title-color: #0f172a;
  --shortener-info-desc-color: #64748b;
  --shortener-perm-note-bg: rgba(99, 102, 241, 0.08);
  --shortener-perm-note-border: rgba(99, 102, 241, 0.25);
  --shortener-perm-note-color: #4338ca;
  --shortener-perm-link-color: #1e1b4b;
}

[data-bs-theme="dark"] {
  --app-bg: #070a12;
  --app-surface: #0c101c;
  --app-surface-subtle: #0f1424;
  --app-border: #1c2438;
  --app-border-focus: #6366f1;
  --app-text-primary: #f8fafc;
  --app-text-secondary: #cbd5e1;
  --app-text-muted: #94a3b8;
  --app-primary: #6366f1;
  --app-primary-hover: #4f46e5;
  --app-primary-subtle: #1e1e42;
  --app-primary-text: #c7d2fe;
  --app-success: #34d399;
  --app-success-subtle: #064e3b;
  --app-danger: #f87171;
  --app-warning: #fbbf24;
  --app-card-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.6);
  --app-card-shadow-hover: 0 22px 44px -8px rgba(0, 0, 0, 0.7), 0 0 0 1px #4f46e5;
  --app-sidebar-bg: #0c101c;
  --app-header-bg: #0c101c;
  --app-hero-bg: #060911;
  --app-hero-title-color: #ffffff;
  --app-hero-desc-color: #cbd5e1;

  /* Shortener Tool Theme Variables (Dark Mode) */
  --shortener-card-bg: #0c101c;
  --shortener-card-border: #1c2438;
  --shortener-card-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.6);
  --shortener-heading-color: #ffffff;
  --shortener-label-color: #cbd5e1;
  --shortener-subtext-color: #94a3b8;
  --shortener-input-bg: #141a2c;
  --shortener-input-border: #232c48;
  --shortener-input-color: #ffffff;
  --shortener-input-placeholder: #4b556f;
  --shortener-input-focus-border: #6366f1;
  --shortener-input-icon-color: #64748b;
  --shortener-rule-container-bg: #0f1424;
  --shortener-rule-container-border: #1a223a;
  --shortener-rule-badge-bg: #1e1e42;
  --shortener-rule-badge-color: #a5b4fc;
  --shortener-rule-badge-border: #4338ca;
  --shortener-rule-card-bg: #111628;
  --shortener-rule-card-border: #1d253f;
  --shortener-rule-card-hover: #13192f;
  --shortener-rule-card-active-bg: #131936;
  --shortener-rule-card-active-border: #4f46e5;
  --shortener-rule-card-active-shadow: 0 0 0 1px #4f46e5, 0 4px 14px rgba(79, 70, 229, 0.25);
  --shortener-rule-icon-bg: #1a223e;
  --shortener-rule-icon-color: #818cf8;
  --shortener-rule-icon-active-bg: #312e81;
  --shortener-rule-icon-active-color: #c7d2fe;
  --shortener-badge-active-bg: #312e81;
  --shortener-badge-active-color: #c7d2fe;
  --shortener-subpanel-bg: #111628;
  --shortener-subpanel-border: #1c243e;
  --shortener-subpanel-header-color: #cbd5e1;
  --shortener-subpanel-display-color: #818cf8;
  --shortener-num-input-bg: #161c30;
  --shortener-num-input-border: #252f4c;
  --shortener-num-input-color: #ffffff;
  --shortener-preset-bg: #1a2035;
  --shortener-preset-border: #242d48;
  --shortener-preset-color: #94a3b8;
  --shortener-preset-hover-bg: #222b46;
  --shortener-preset-hover-color: #ffffff;
  --shortener-preset-active-bg: #4f46e5;
  --shortener-preset-active-border: #4f46e5;
  --shortener-preset-active-color: #ffffff;
  --shortener-slider-track: #1e2640;
  --shortener-info-bg: #111629;
  --shortener-info-border: #1c243e;
  --shortener-info-title-color: #ffffff;
  --shortener-info-desc-color: #94a3b8;
  --shortener-perm-note-bg: rgba(99, 102, 241, 0.08);
  --shortener-perm-note-border: rgba(99, 102, 241, 0.35);
  --shortener-perm-note-color: #a5b4fc;
  --shortener-perm-link-color: #ffffff;
}

/* Base Body Styles */
body {
  font-family: var(--app-font-sans);
  background-color: var(--app-bg);
  color: var(--app-text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  flex: 1 0 auto;
}

/* Header & Navigation */
.navbar-app {
  background-color: var(--app-header-bg);
  border-bottom: 1px solid var(--app-border);
  backdrop-filter: blur(8px);
  padding: 0.65rem 0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--app-primary), #4f46e5);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.05rem;
}

.nav-link-custom {
  color: var(--app-text-secondary);
  font-weight: 500;
  font-size: 0.925rem;
  padding: 0.45rem 0.75rem;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.nav-link-custom:hover,
.nav-link-custom.active {
  color: var(--app-text-primary);
  background-color: var(--app-surface-subtle);
}

/* Cards & Surfaces */
.card-custom {
  background-color: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 14px;
  box-shadow: var(--app-card-shadow);
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.tool-card-item .card-custom {
  overflow: hidden;
  position: relative;
}

/* Navbar Dropdown Menu (Ensure overlay positioning so header never stretches) */
.navbar-app .dropdown {
  position: relative;
}

.navbar-app .dropdown-menu,
.dropdown-menu.card-custom {
  position: absolute !important;
  top: 100% !important;
  right: 0 !important;
  left: auto !important;
  z-index: 1060 !important;
  margin-top: 0.5rem !important;
  min-width: 215px;
  background-color: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 12px;
  box-shadow: var(--app-card-shadow);
  overflow: visible !important;
}

.card-custom-interactive:hover,
.card-custom:hover {
  border-color: var(--app-border-focus);
}

.card-custom-interactive:hover {
  box-shadow: var(--app-card-shadow-hover);
}

.card-custom .card-header {
  background-color: transparent;
  border-bottom: 1px solid var(--app-border);
  padding: 1rem 1.25rem;
}

.card-custom .card-footer {
  background-color: var(--app-surface-subtle);
  border-top: 1px solid var(--app-border);
  padding: 0.85rem 1.25rem;
}

/* Hero Section Styles */
.hero-section-wrapper {
  background-color: var(--app-hero-bg);
  position: relative;
  transition: background-color 0.2s ease;
}

.hero-headline {
  font-size: clamp(2.3rem, 4.5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--app-hero-title-color);
}

.hero-subheading {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--app-hero-desc-color);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
  font-weight: 450;
}

/* Buttons */
.btn-primary-custom {
  background-color: var(--app-primary);
  border-color: var(--app-primary);
  color: #ffffff;
  font-weight: 500;
  border-radius: 9px;
  padding: 0.55rem 1.1rem;
  box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
  transition: all 0.15s ease;
}

.btn-primary-custom:hover {
  background-color: var(--app-primary-hover);
  border-color: var(--app-primary-hover);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
}

.btn-outline-custom {
  border-color: var(--app-border);
  color: var(--app-text-primary);
  background-color: var(--app-surface);
  border-radius: 9px;
  font-weight: 500;
  padding: 0.55rem 1.1rem;
  transition: all 0.15s ease;
}

.btn-outline-custom:hover {
  border-color: var(--app-border-focus);
  background-color: var(--app-surface-subtle);
  color: var(--app-text-primary);
}

.btn-sm.btn-primary-custom,
.btn-group-sm > .btn-primary-custom,
.btn-sm.btn-outline-custom,
.btn-group-sm > .btn-outline-custom {
  padding: 0.28rem 0.65rem;
  font-size: 0.8125rem;
  line-height: 1.25;
  border-radius: 7px;
}

/* Form Controls */
.form-control-custom,
.form-select-custom {
  background-color: var(--shortener-input-bg);
  border: 1px solid var(--shortener-input-border);
  color: var(--shortener-input-color);
  border-radius: 10px;
  padding: 0.6rem 0.9rem;
  font-size: 0.95rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.form-control-custom:focus,
.form-select-custom:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
  background-color: var(--shortener-input-bg);
  color: var(--shortener-input-color);
}

/* Tables */
.table-custom {
  color: var(--app-text-primary);
  border-color: var(--app-border);
  vertical-align: middle;
}

.table-custom th {
  font-size: 0.825rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--app-text-muted);
  font-weight: 600;
  background-color: var(--app-surface-subtle);
  border-bottom: 1px solid var(--app-border);
  padding: 0.75rem 1rem;
}

.table-custom td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--app-border);
  vertical-align: middle;
}

.table-custom th.text-end,
.table-custom td.text-end {
  white-space: nowrap;
  vertical-align: middle;
}

.table-custom td .btn-group,
.table-custom td .d-inline-flex {
  align-items: center !important;
  flex-wrap: nowrap !important;
}

.table-custom td .btn-sm,
.table-custom td .btn-group-sm > .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  height: 30px;
  padding: 0 0.6rem;
  font-size: 0.78rem;
  line-height: 1;
  align-self: center;
  flex-shrink: 0;
}

/* Admin Sidebar Layout */
.admin-layout {
  display: flex;
  min-height: calc(100vh - 61px);
}

.admin-sidebar {
  width: 260px;
  background-color: var(--app-sidebar-bg);
  border-right: 1px solid var(--app-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.admin-content {
  flex: 1 1 auto;
  padding: 1.75rem;
  overflow-y: auto;
}

.admin-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  margin: 0.15rem 0.75rem;
  border-radius: 8px;
  color: var(--app-text-secondary);
  font-size: 0.925rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
}

.admin-nav-item:hover {
  color: var(--app-text-primary);
  background-color: var(--app-surface-subtle);
}

.admin-nav-item.active {
  color: var(--app-primary);
  background-color: var(--app-primary-subtle);
  font-weight: 600;
}

.admin-nav-item i {
  font-size: 1.15rem;
  width: 20px;
  text-align: center;
}

/* Tool Shell & Workspace */
.tool-shell {
  max-width: 980px;
  margin: 0 auto;
}

.tool-workspace {
  background-color: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 12px;
  box-shadow: var(--app-card-shadow);
  padding: 1.75rem;
}

.tool-result-box {
  background-color: var(--app-surface-subtle);
  border: 1px dashed var(--app-border);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
}

/* Toast Notifications Container */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.app-toast {
  pointer-events: auto;
  background-color: var(--app-surface);
  border: 1px solid var(--app-border);
  border-radius: 8px;
  padding: 0.85rem 1.25rem;
  box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.925rem;
  max-width: 380px;
  transform: translateY(20px);
  opacity: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.app-toast.show {
  transform: translateY(0);
  opacity: 1;
}

.app-toast.toast-success i { color: var(--app-success); }
.app-toast.toast-error i { color: var(--app-danger); }
.app-toast.toast-info i { color: var(--app-primary); }

/* =========================================================
 * LINK SHORTENER TOOL VIEW (Theme-Adaptive Modern UI)
 * ========================================================= */
.shortener-tool-card {
  background-color: var(--shortener-card-bg);
  border: 1px solid var(--shortener-card-border);
  border-radius: 18px;
  color: var(--shortener-heading-color);
  box-shadow: var(--shortener-card-shadow);
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
  position: relative;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.shortener-card-heading {
  color: var(--shortener-heading-color) !important;
}

.shortener-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--shortener-label-color);
  margin-bottom: 0.45rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.shortener-label .req {
  color: #ef4444;
  margin-left: 2px;
}

.shortener-input-group {
  position: relative;
  width: 100%;
}

.shortener-input {
  background-color: var(--shortener-input-bg) !important;
  border: 1px solid var(--shortener-input-border) !important;
  color: var(--shortener-input-color) !important;
  border-radius: 12px !important;
  font-size: 0.925rem;
  padding: 0.82rem 2.8rem 0.82rem 1rem !important;
  box-shadow: none !important;
  width: 100%;
  box-sizing: border-box;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.2s ease;
}

.shortener-input::placeholder {
  color: var(--shortener-input-placeholder) !important;
  opacity: 1;
}

.shortener-input:focus {
  border-color: var(--shortener-input-focus-border) !important;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25) !important;
}

.shortener-input-icon {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--shortener-input-icon-color);
  pointer-events: none;
}

/* Expiration Rules Container */
.shortener-rule-container {
  background-color: var(--shortener-rule-container-bg);
  border: 1px solid var(--shortener-rule-container-border);
  border-radius: 14px;
  padding: 1.15rem;
  box-sizing: border-box;
  width: 100%;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.shortener-rule-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.shortener-rule-badge-configured {
  background-color: var(--shortener-rule-badge-bg);
  border: 1px solid var(--shortener-rule-badge-border);
  color: var(--shortener-rule-badge-color);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 20px;
  letter-spacing: 0.3px;
}

/* Rule Option Cards */
.shortener-rule-card {
  background-color: var(--shortener-rule-card-bg);
  border: 1px solid var(--shortener-rule-card-border);
  border-radius: 12px;
  padding: 0.8rem 0.85rem;
  cursor: pointer;
  transition: all 0.18s ease;
  user-select: none;
  height: 100%;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.shortener-rule-card:hover {
  border-color: var(--shortener-rule-card-active-border);
  background-color: var(--shortener-rule-card-hover);
}

.shortener-rule-card.active {
  background-color: var(--shortener-rule-card-active-bg);
  border-color: var(--shortener-rule-card-active-border);
  box-shadow: var(--shortener-rule-card-active-shadow);
}

.shortener-rule-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background-color: var(--shortener-rule-icon-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--shortener-rule-icon-color);
  font-size: 1rem;
  flex-shrink: 0;
  transition: all 0.18s ease;
}

.shortener-rule-card.active .shortener-rule-icon {
  background-color: var(--shortener-rule-icon-active-bg);
  color: var(--shortener-rule-icon-active-color);
}

.shortener-badge-active {
  background-color: var(--shortener-badge-active-bg);
  color: var(--shortener-badge-active-color);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 10px;
  letter-spacing: 0.3px;
}

/* Inner Settings Pane */
.shortener-subpanel {
  background-color: var(--shortener-subpanel-bg);
  border: 1px solid var(--shortener-subpanel-border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 0.85rem;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.shortener-subpanel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--shortener-subpanel-header-color);
}

.shortener-subpanel-display {
  color: var(--shortener-subpanel-display-color);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: none;
}

.shortener-num-input {
  background-color: var(--shortener-num-input-bg) !important;
  border: 1px solid var(--shortener-num-input-border) !important;
  color: var(--shortener-num-input-color) !important;
  font-weight: 700;
  text-align: center;
  width: 75px;
  height: 34px;
  border-radius: 8px;
  font-size: 0.85rem;
  padding: 0 4px;
  box-shadow: none !important;
}

.shortener-num-input:focus {
  border-color: #6366f1 !important;
}

.shortener-preset-btn {
  background-color: var(--shortener-preset-bg);
  border: 1px solid var(--shortener-preset-border);
  color: var(--shortener-preset-color);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 8px;
  transition: all 0.15s ease;
  cursor: pointer;
}

.shortener-preset-btn:hover {
  background-color: var(--shortener-preset-hover-bg);
  color: var(--shortener-preset-hover-color);
}

.shortener-preset-btn.active {
  background-color: var(--shortener-preset-active-bg);
  border-color: var(--shortener-preset-active-border);
  color: var(--shortener-preset-active-color);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.35);
}

/* Range Slider */
.shortener-range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(to right, #6366f1 0%, #8b5cf6 var(--slider-pct, 2%), var(--shortener-slider-track) var(--slider-pct, 2%), var(--shortener-slider-track) 100%);
  border-radius: 4px;
  outline: none;
  margin: 12px 0 6px 0;
}

.shortener-range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid #6366f1;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.6);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.shortener-range-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid #6366f1;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.6);
  cursor: pointer;
}

.shortener-range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Info Box */
.shortener-info-box {
  background-color: var(--shortener-info-bg);
  border: 1px solid var(--shortener-info-border);
  border-radius: 10px;
  padding: 0.75rem 0.95rem;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.shortener-info-title {
  color: var(--shortener-info-title-color) !important;
}

.shortener-info-desc {
  color: var(--shortener-info-desc-color) !important;
}

/* Create Short Link Action Button */
.btn-create-short-link {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  border: none;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.025rem;
  border-radius: 12px;
  padding: 0.9rem 1.5rem;
  box-shadow: 0 4px 22px rgba(99, 102, 241, 0.45);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  width: 100%;
}

.btn-create-short-link:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.65);
  color: #ffffff;
}

.btn-create-short-link:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

/* Permanent Link Note */
.shortener-perm-note {
  background-color: var(--shortener-perm-note-bg);
  border: 1px dashed var(--shortener-perm-note-border);
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  font-size: 0.78rem;
  color: var(--shortener-perm-note-color);
  line-height: 1.45;
}

.shortener-perm-note a {
  color: var(--shortener-perm-link-color);
  text-decoration: underline;
  font-weight: 600;
}

.shortener-perm-note a:hover {
  opacity: 0.85;
}

/* Mobile Responsiveness Guard */
@media (max-width: 576px) {
  .shortener-tool-card {
    padding: 1rem !important;
    border-radius: 14px;
  }
  .shortener-rule-container {
    padding: 0.85rem !important;
  }
  .shortener-input {
    font-size: 0.85rem;
    padding-right: 2.4rem !important;
  }
  .shortener-preset-btn {
    padding: 3px 8px;
    font-size: 0.72rem;
  }
  .btn-create-short-link {
    font-size: 0.95rem;
    padding: 0.8rem 1rem;
  }
}

/* Compact Ad Banners */
.ad-slot-card {
  border: 1px dashed var(--app-border);
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  background-color: var(--app-surface-subtle);
  font-size: 0.85rem;
}

/* Mobile Responsiveness */
@media (max-width: 991.98px) {
  .admin-layout {
    flex-direction: column;
  }
  .admin-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--app-border);
    flex-direction: row;
    overflow-x: auto;
    padding: 0.5rem;
  }
  .admin-nav-item {
    margin: 0 0.25rem;
    white-space: nowrap;
  }
  .admin-content {
    padding: 1rem;
  }
}

/* =========================================================
 * Badge Theme Adaptation (Light & Dark Mode)
 * Ensures high contrast, visible text and borders across all themes
 * ========================================================= */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* Fix for .bg-light text-dark in Admin Tables & Dashboards */
[data-bs-theme="dark"] .badge.bg-light,
[data-bs-theme="dark"] .badge.text-dark {
  background-color: rgba(255, 255, 255, 0.12) !important;
  color: #f1f5f9 !important;
  border-color: rgba(255, 255, 255, 0.18) !important;
}

[data-bs-theme="dark"] .badge.bg-body-secondary {
  background-color: rgba(255, 255, 255, 0.1) !important;
  color: #cbd5e1 !important;
}

[data-bs-theme="dark"] .badge.bg-primary-subtle {
  background-color: rgba(59, 130, 246, 0.2) !important;
  color: #93c5fd !important;
  border: 1px solid rgba(59, 130, 246, 0.3) !important;
}

[data-bs-theme="dark"] .badge.bg-success-subtle {
  background-color: rgba(16, 185, 129, 0.2) !important;
  color: #6ee7b7 !important;
  border: 1px solid rgba(16, 185, 129, 0.3) !important;
}

[data-bs-theme="dark"] .badge.bg-warning-subtle {
  background-color: rgba(245, 158, 11, 0.2) !important;
  color: #fcd34d !important;
  border: 1px solid rgba(245, 158, 11, 0.3) !important;
}

[data-bs-theme="dark"] .badge.bg-danger-subtle {
  background-color: rgba(239, 68, 68, 0.2) !important;
  color: #fca5a5 !important;
  border: 1px solid rgba(239, 68, 68, 0.3) !important;
}

[data-bs-theme="dark"] .badge.bg-info-subtle {
  background-color: rgba(14, 165, 233, 0.2) !important;
  color: #7dd3fc !important;
  border: 1px solid rgba(14, 165, 233, 0.3) !important;
}

[data-bs-theme="dark"] .badge.bg-secondary-subtle {
  background-color: rgba(148, 163, 184, 0.15) !important;
  color: #e2e8f0 !important;
  border: 1px solid rgba(148, 163, 184, 0.25) !important;
}

/* Navigation & Dropdown Stacking Rules - Profile dropdown must always appear on top */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1050 !important;
}

.navbar .dropdown {
  position: relative;
  z-index: 1055 !important;
}

.navbar .dropdown-menu {
  z-index: 1065 !important;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15), 0 8px 10px -6px rgba(0, 0, 0, 0.1) !important;
}

/* Ensure device preview mockups in bio builder and card elements stay below navigation */
.bio-preview-column,
.bio-preview-sticky,
.sticky-preview-wrapper {
  position: relative;
  z-index: 10 !important;
}

/* =========================================================
 * Universal Tool Upload Dropzone & Utility Work Areas
 * ========================================================= */
.tool-dropzone,
.dropzone-box,
#img-dropzone,
#pdf-dropzone,
#doc-dropzone,
#zip-dropzone,
#file-dropzone,
.border-dashed {
  background-color: var(--app-surface-subtle) !important;
  border: 2px dashed var(--app-border) !important;
  color: var(--app-text-primary) !important;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

.tool-dropzone:hover,
.dropzone-box:hover,
#img-dropzone:hover,
#pdf-dropzone:hover,
#doc-dropzone:hover,
#zip-dropzone:hover,
#file-dropzone:hover,
.border-dashed:hover,
.tool-dropzone.dragover,
#img-dropzone.dragover,
#pdf-dropzone.dragover {
  background-color: var(--app-surface) !important;
  border-color: var(--app-primary) !important;
  box-shadow: 0 0 0 1px var(--app-primary), 0 8px 24px rgba(99, 102, 241, 0.15) !important;
}

.tool-preview-area,
.tool-sub-card {
  background-color: var(--app-surface-subtle) !important;
  border: 1px solid var(--app-border) !important;
  color: var(--app-text-primary) !important;
  border-radius: 12px;
}

/* Dark Mode Overrides for Tool Workspaces */
[data-bs-theme="dark"] .tool-dropzone,
[data-bs-theme="dark"] .dropzone-box,
[data-bs-theme="dark"] #img-dropzone,
[data-bs-theme="dark"] #pdf-dropzone,
[data-bs-theme="dark"] #doc-dropzone,
[data-bs-theme="dark"] #zip-dropzone,
[data-bs-theme="dark"] #file-dropzone,
[data-bs-theme="dark"] .border-dashed,
[data-bs-theme="dark"] div[id*="dropzone"] {
  background-color: #0f1424 !important;
  border-color: #232c48 !important;
  color: #f8fafc !important;
}

[data-bs-theme="dark"] .tool-dropzone:hover,
[data-bs-theme="dark"] .dropzone-box:hover,
[data-bs-theme="dark"] #img-dropzone:hover,
[data-bs-theme="dark"] #pdf-dropzone:hover,
[data-bs-theme="dark"] #doc-dropzone:hover,
[data-bs-theme="dark"] #zip-dropzone:hover,
[data-bs-theme="dark"] #file-dropzone:hover,
[data-bs-theme="dark"] .border-dashed:hover,
[data-bs-theme="dark"] .tool-dropzone.dragover,
[data-bs-theme="dark"] #img-dropzone.dragover,
[data-bs-theme="dark"] #pdf-dropzone.dragover {
  background-color: #141b30 !important;
  border-color: #6366f1 !important;
  box-shadow: 0 0 0 1px #6366f1, 0 8px 28px rgba(99, 102, 241, 0.3) !important;
}

[data-bs-theme="dark"] .tool-preview-area,
[data-bs-theme="dark"] .tool-sub-card,
[data-bs-theme="dark"] .bg-body-tertiary {
  background-color: #0f1424 !important;
  border-color: #1c2438 !important;
  color: #f8fafc !important;
}

[data-bs-theme="dark"] .card.bg-light,
[data-bs-theme="dark"] .bg-light,
[data-bs-theme="dark"] [class*="bg-light"] {
  background-color: #0f1424 !important;
  border-color: #1c2438 !important;
  color: #f8fafc !important;
}

/* Tool Card Header Layout (Ensures Heart Button Stays Strictly Inside Card Box) */
.tool-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  min-width: 0;
}

.tool-card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
}

.tool-card-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.15rem;
}

.tool-card-badge {
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.32em 0.65em;
  border-radius: 6px;
}

/* Tool Favorite (Love) Button: Clean outlined heart & count, colored heart & count on saved */
.btn-favorite-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  flex-shrink: 0;
  white-space: nowrap;
  background-color: transparent;
  border: 1px solid var(--app-border, #e2e8f0);
  color: var(--app-text-secondary, #64748b);
  border-radius: 9999px;
  padding: 0.26rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1;
  transition: all 0.18s ease;
  cursor: pointer;
  user-select: none;
  box-shadow: none;
  text-decoration: none !important;
  max-width: 100%;
}

.btn-favorite-toggle i {
  font-size: 0.85rem;
  color: #94a3b8;
  transition: transform 0.18s ease, color 0.18s ease;
}

.btn-favorite-toggle:hover {
  border-color: #fca5a5;
  color: #e11d48;
}

.btn-favorite-toggle:hover i {
  color: #e11d48;
}

/* Saved state: Colored heart & count, subtle light background tint, NOT solid red */
.btn-favorite-toggle.active {
  background-color: rgba(239, 68, 68, 0.08) !important;
  border-color: rgba(239, 68, 68, 0.35) !important;
  color: #e11d48 !important;
}

.btn-favorite-toggle.active i {
  color: #e11d48 !important;
}

.btn-favorite-toggle.active .favorite-count {
  color: #e11d48 !important;
  font-weight: 600;
}

[data-bs-theme="dark"] .btn-favorite-toggle {
  border-color: #334155;
  color: #94a3b8;
}

[data-bs-theme="dark"] .btn-favorite-toggle i {
  color: #64748b;
}

[data-bs-theme="dark"] .btn-favorite-toggle:hover {
  border-color: #f87171;
  color: #fb7185;
}

[data-bs-theme="dark"] .btn-favorite-toggle:hover i {
  color: #fb7185;
}

[data-bs-theme="dark"] .btn-favorite-toggle.active {
  background-color: rgba(239, 68, 68, 0.16) !important;
  border-color: rgba(239, 68, 68, 0.5) !important;
  color: #fb7185 !important;
}

[data-bs-theme="dark"] .btn-favorite-toggle.active i {
  color: #fb7185 !important;
}

/* Tool Share Button (companion to Save to Favorites button) */
.btn-tool-share {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  flex-shrink: 0;
  white-space: nowrap;
  background-color: transparent;
  border: 1px solid var(--app-border, #e2e8f0);
  color: var(--app-text-secondary, #64748b);
  border-radius: 9999px;
  padding: 0.26rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1;
  transition: all 0.18s ease;
  cursor: pointer;
  user-select: none;
  box-shadow: none;
  text-decoration: none !important;
}

.btn-tool-share i {
  font-size: 0.85rem;
  color: #94a3b8;
  transition: transform 0.18s ease, color 0.18s ease;
}

.btn-tool-share:hover,
.btn-tool-share[aria-expanded="true"] {
  border-color: var(--bs-primary, #4f46e5);
  color: var(--bs-primary, #4f46e5);
  background-color: rgba(79, 70, 229, 0.06);
}

.btn-tool-share:hover i,
.btn-tool-share[aria-expanded="true"] i {
  color: var(--bs-primary, #4f46e5);
}

[data-bs-theme="dark"] .btn-tool-share {
  border-color: #334155;
  color: #94a3b8;
}

[data-bs-theme="dark"] .btn-tool-share i {
  color: #64748b;
}

[data-bs-theme="dark"] .btn-tool-share:hover,
[data-bs-theme="dark"] .btn-tool-share[aria-expanded="true"] {
  border-color: #818cf8;
  color: #818cf8;
  background-color: rgba(129, 140, 248, 0.12);
}

[data-bs-theme="dark"] .btn-tool-share:hover i,
[data-bs-theme="dark"] .btn-tool-share[aria-expanded="true"] i {
  color: #818cf8;
}

/* ==============================================================
   FANCY TEXT & UNICODE FONT ENGINE STYLES
   ============================================================== */
.fancy-font-preview {
  font-family: 'Noto Sans Math', 'Cambria Math', 'STIX Two Math', 'Segoe UI Symbol', 'Apple Symbols', 'Lucida Sans Unicode', system-ui, sans-serif !important;
  font-size: 1.18rem !important;
  letter-spacing: 0.025em;
  line-height: 1.45;
  word-break: break-all;
}

/* ==============================================================
   KAOMOJI JAPANESE EMOTICONS CARD & FEEDBACK STYLES
   ============================================================== */
.kao-item-btn {
  background: var(--app-surface, #ffffff);
  border: 1px solid var(--app-border, #e2e8f0);
  border-radius: 0.75rem;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease;
  user-select: none;
  cursor: pointer;
}

.kao-item-btn:hover {
  transform: translateY(-2px);
  border-color: var(--app-primary, #4f46e5);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.12);
}

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

.kao-item-btn.copied-active {
  border-color: var(--app-primary, #4f46e5) !important;
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.22) !important;
}

.kao-symbol {
  font-family: 'Noto Sans Math', 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans CJK JP', 'Hiragino Sans', 'Yu Gothic', sans-serif !important;
  font-size: 1.18rem;
  letter-spacing: 0.03em;
  color: var(--bs-body-color);
  line-height: 1.35;
  transition: color 0.15s ease;
}

.kao-tag {
  transition: color 0.15s ease;
}

[data-bs-theme="dark"] .kao-item-btn {
  background: rgba(30, 41, 59, 0.6);
  border-color: #334155;
}

[data-bs-theme="dark"] .kao-item-btn:hover {
  border-color: #818cf8;
  box-shadow: 0 6px 16px rgba(129, 140, 248, 0.15);
}

[data-bs-theme="dark"] .kao-item-btn.copied-active {
  border-color: #818cf8 !important;
  box-shadow: 0 0 0 2px rgba(129, 140, 248, 0.25) !important;
}