/* ==========================================================================
   iQuantum — top-tier search UI
   ========================================================================== */

@import url('https://fonts.googleapis.com/css?family=Lato:300,400,700');
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap");

:root {
  /* Surface */
  --bg: #090A0F;
  --bg-gradient-start: #1B2735;
  --bg-gradient-end: #090A0F;

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.78);
  --text-muted: rgba(255, 255, 255, 0.55);

  /* Surfaces / borders */
  --surface-1: rgba(20, 22, 30, 0.55);
  --surface-2: rgba(28, 30, 40, 0.78);
  --surface-3: rgba(40, 44, 60, 0.85);
  --border-color: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.20);

  /* Brand accents */
  --accent-1: #00c2ff;
  --accent-2: #e54cff;
  --accent-3: #33ff8c;
  --accent-4: #ffc640;
  --gradient-brand: linear-gradient(135deg, rgba(0, 194, 255, 0.85), rgba(229, 76, 255, 0.85));
  --gradient-brand-soft: linear-gradient(135deg, rgba(0, 194, 255, 0.18), rgba(229, 76, 255, 0.22));

  /* Inputs */
  --input-bg: rgba(15, 17, 24, 0.85);
  --input-bg-focus: rgba(20, 22, 30, 0.95);

  /* Focus */
  --focus-outline: #4d90fe;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;

  /* Radii */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.25);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.35);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.45);

  /* Type */
  --fs: clamp(2rem, 5vw, 4rem);
  --ls: clamp(-1.75px, -0.25vw, -3.5px);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', 'Lato', sans-serif; }

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background: radial-gradient(ellipse at bottom, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(229, 76, 255, 0.4); color: #fff; }

/* Skip nav */
.skip-nav {
  position: absolute; left: -9999px; z-index: 9999;
  padding: 1rem 1.5rem; background: var(--focus-outline); color: #fff;
  font-weight: 700; text-decoration: none; border-radius: 0 0 4px 0;
}
.skip-nav:focus { left: 0; outline: none; box-shadow: var(--shadow-md); }

/* Stars */
#stars, #stars2, #stars3 {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
}
@keyframes animStar { from { transform: translateY(0); } to { transform: translateY(-2000px); } }

/* Bold white headings */
.gradient-text { color: #FFF; font-weight: 700; display: inline-block; }

/* Aurora helper styles preserved from existing */
.aurora { position: absolute; inset: 0; z-index: -1; mix-blend-mode: screen; pointer-events: none; }

/* ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
  position: relative;
  background-color: rgba(10, 10, 15, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
  z-index: 100;
}
.navbar-content {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem; position: relative; z-index: 10;
}
.logo-container { display: flex; align-items: center; }
.logo { width: 8.5rem; height: 4rem; border-radius: 0.75rem; object-fit: contain; }

.navbar-actions {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; justify-content: flex-end;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero { padding: 1rem 0 0.5rem; position: relative; z-index: 1; }

/* ==========================================================================
   Sticky search bar
   ========================================================================== */
.search-bar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 12, 18, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0 0.5rem;
  margin-top: 0.5rem;
  box-shadow: 0 1px 0 rgba(255,255,255,0.04), 0 12px 36px rgba(0,0,0,0.35);
}
.search-bar__inner {
  display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap;
}

/* Search input */
.search-input-wrap {
  position: relative; flex: 1 1 360px; min-width: 260px;
}
.search-input-wrap__icon {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); pointer-events: none; font-size: 0.95rem;
}
.search-input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  height: 48px;
  padding: 0 92px 0 42px;
  border-radius: var(--r-md);
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  outline: none;
  background: var(--input-bg-focus);
  border-color: var(--accent-2);
  box-shadow: 0 0 0 4px rgba(229, 76, 255, 0.18);
}
.search-input-wrap__clear {
  position: absolute; right: 64px; top: 50%; transform: translateY(-50%);
  width: 26px; height: 26px; border-radius: 50%; border: none;
  background: rgba(255,255,255,0.08); color: var(--text-secondary);
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
  font-size: 0.7rem;
}
.search-input-wrap__clear:hover { background: rgba(255,255,255,0.18); color: #fff; }
.search-input-wrap__kbd {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  display: inline-flex; align-items: center; gap: 2px;
  padding: 3px 8px; font-size: 0.75rem; font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  pointer-events: none;
}
.kbd-mod { font-size: 0.85rem; }

.search-input-wrap__loader {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  border-top-color: var(--accent-2);
  animation: spin 0.8s linear infinite;
  display: none;
}
.search-bar.is-loading .search-input-wrap__loader { display: block; }
.search-bar.is-loading .search-input-wrap__kbd { display: none; }

/* Filters */
.search-bar__filters {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
}
.select-wrap { position: relative; }

/* Active filters chips */
.active-filters {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  padding: 0.5rem 0 0;
  min-height: 0;
}
.active-filters:not(:empty) { padding-top: 0.6rem; }

.chip {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.3rem 0.65rem 0.3rem 0.75rem;
  border-radius: var(--r-pill);
  background: var(--gradient-brand-soft);
  border: 1px solid rgba(229,76,255,0.3);
  color: #fff; font-size: 0.82rem; font-weight: 500;
  transition: transform 0.15s ease, background 0.2s ease;
  animation: chipIn 0.18s ease;
}
.chip__label { color: var(--text-muted); margin-right: 2px; font-weight: 500; }
.chip button {
  background: transparent; border: none; color: var(--text-secondary);
  width: 18px; height: 18px; padding: 0; border-radius: 50%; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background 0.2s ease, color 0.2s ease;
  font-size: 0.7rem;
}
.chip button:hover { background: rgba(255,255,255,0.18); color: #fff; }
@keyframes chipIn { from { transform: scale(0.85); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* ==========================================================================
   Content
   ========================================================================== */
.content-container {
  position: relative; z-index: 10;
  padding: 1.5rem 1.25rem 3rem;
  max-width: 1280px; margin: 0 auto;
}
.main-content {
  background: rgba(15, 15, 20, 0.18);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  border-radius: var(--r-lg);
  padding: 1.5rem 1.25rem;
  border: 1px solid var(--border-color);
}

/* Results meta bar */
.results-meta {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; margin-bottom: 1.25rem;
  padding-bottom: 1rem; border-bottom: 1px solid var(--border-color);
}
.results-meta__count { display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
.results-count {
  font-size: 1.85rem; font-weight: 800; letter-spacing: -0.5px;
  background: var(--gradient-brand); -webkit-background-clip: text;
  background-clip: text; color: transparent;
}
.results-count__label { color: var(--text-secondary); font-size: 1rem; font-weight: 500; }
.results-context { color: var(--text-muted); font-size: 0.9rem; }
.results-meta__controls {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
}

/* Form selects */
.form-select, .form-control {
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--r-sm);
  height: 42px;
  padding: 0 36px 0 14px;
  font-size: 0.92rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  appearance: none;
  -webkit-appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%),
    linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) 50%,
    calc(100% - 13px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.form-control { background-image: none; padding-right: 14px; }
.form-select-sm { height: 38px; font-size: 0.85rem; }
.form-select:hover, .form-control:hover { border-color: var(--border-strong); }
.form-select option { background: #14151c; color: #fff; }

/* Focus rings (consistent across inputs/buttons/links) */
.form-control:focus, .form-select:focus, button:focus-visible, a:focus-visible {
  outline: none;
  border-color: var(--focus-outline);
  box-shadow: 0 0 0 4px rgba(77, 144, 254, 0.28);
}

/* View toggle (segmented) */
.view-toggle {
  display: inline-flex; padding: 3px;
  background: var(--input-bg); border: 1px solid var(--border-color);
  border-radius: var(--r-sm);
}
.view-toggle__btn {
  background: transparent; border: none; color: var(--text-secondary);
  width: 36px; height: 32px; border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.view-toggle__btn:hover { color: #fff; }
.view-toggle__btn.is-active {
  background: var(--gradient-brand-soft);
  color: #fff; box-shadow: inset 0 0 0 1px rgba(229,76,255,0.35);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  background-image: var(--gradient-brand);
  color: #FFF; font-weight: 600; font-size: 0.92rem;
  padding: 0.6rem 1.1rem;
  border: none; border-radius: var(--r-pill);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
  letter-spacing: 0.2px;
  box-shadow: 0 4px 14px rgba(229, 76, 255, 0.25);
  text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem;
  position: relative;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.08); box-shadow: 0 6px 20px rgba(229, 76, 255, 0.35); }
.btn:active { transform: translateY(0); }

/* Ghost button */
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  box-shadow: none;
  color: var(--text-primary);
}
.btn-ghost:hover { background: rgba(255,255,255,0.05); filter: none; box-shadow: none; }

/* Donation buttons */
.btn-github, .btn-paypal, .btn-patreon, .btn-coffee {
  background: transparent; background-image: none;
  border: 1px solid var(--border-strong);
  box-shadow: none; padding: 0.5rem 0.95rem; font-size: 0.85rem;
  color: var(--text-primary);
}
.btn-github:hover  { background: rgb(82, 34, 127);  border-color: rgb(82, 34, 127);  filter: none; box-shadow: 0 0 0 4px rgba(82,34,127,0.3); }
.btn-paypal:hover  { background: rgb(9, 51, 142);   border-color: rgb(9, 51, 142);   filter: none; box-shadow: 0 0 0 4px rgba(9,51,142,0.3); }
.btn-patreon:hover { background: rgb(249, 109, 89); border-color: rgb(249, 109, 89); filter: none; box-shadow: 0 0 0 4px rgba(249,109,89,0.3); }
.btn-coffee:hover  { background: rgb(255, 222, 89); border-color: rgb(255, 222, 89); filter: none; box-shadow: 0 0 0 4px rgba(255,222,89,0.3); color: #000; }

/* ==========================================================================
   Resource cards (grid + list)
   ========================================================================== */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}
.resources-grid.is-list {
  grid-template-columns: 1fr;
}

.resource-card {
  position: relative;
  display: flex; flex-direction: column;
  background: linear-gradient(180deg, var(--surface-2), var(--surface-1));
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  animation: cardIn 0.28s ease both;
}
.resource-card::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: var(--gradient-brand-soft);
  opacity: 0; transition: opacity 0.25s ease;
}
.resource-card:hover {
  transform: translateY(-3px);
  border-color: rgba(229, 76, 255, 0.45);
  box-shadow: var(--shadow-md);
}
.resource-card:hover::before { opacity: 0.35; }
.resource-card:focus-within {
  border-color: rgba(0, 194, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(0,194,255,0.18);
}

@keyframes cardIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.resource-card__head {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  position: relative; z-index: 1;
}
.resource-card__favicon {
  width: 28px; height: 28px; border-radius: 6px; flex: 0 0 28px;
  background: rgba(255,255,255,0.06);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.resource-card__favicon img { width: 18px; height: 18px; }
.resource-card__favicon i { color: var(--text-muted); font-size: 0.85rem; }
.resource-card__title {
  flex: 1; min-width: 0;
  font-size: 1rem; font-weight: 700; color: #fff;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.resource-card__body {
  flex: 1; padding: 0.85rem 1rem 0.5rem; position: relative; z-index: 1;
}
.resource-card__desc {
  color: var(--text-secondary); font-size: 0.92rem; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 3; line-clamp: 3;
  -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 0.75rem;
}
.resource-card__meta {
  display: flex; flex-wrap: wrap; gap: 0.35rem 0.5rem;
  margin-bottom: 0.6rem; font-size: 0.78rem;
}
.meta-pill {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.2rem 0.55rem; border-radius: var(--r-pill);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary); cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.meta-pill:hover { background: var(--gradient-brand-soft); color: #fff; border-color: rgba(229,76,255,0.4); }
.meta-pill i { font-size: 0.7rem; opacity: 0.8; }

.resource-card__tags {
  display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.5rem;
}
.resource-tag {
  display: inline-flex; align-items: center;
  background: rgba(133, 89, 255, 0.16);
  color: var(--text-primary);
  padding: 0.18rem 0.55rem;
  border-radius: var(--r-pill);
  font-size: 0.74rem;
  border: 1px solid rgba(133, 89, 255, 0.28);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}
.resource-tag:hover { background: rgba(133, 89, 255, 0.34); transform: translateY(-1px); }

.resource-card__foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.7rem 1rem 0.85rem;
  position: relative; z-index: 1;
}
.resource-card__visit {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.85rem; font-weight: 600;
  color: #fff;
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border-radius: var(--r-pill);
  background: var(--gradient-brand);
  box-shadow: 0 2px 10px rgba(229, 76, 255, 0.3);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.resource-card__visit:hover { transform: translateX(2px); box-shadow: 0 4px 14px rgba(229, 76, 255, 0.45); }
.resource-card__url {
  font-size: 0.78rem; color: var(--text-muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  max-width: 60%;
}

/* List view variant */
.resources-grid.is-list .resource-card {
  flex-direction: row; align-items: stretch;
}
.resources-grid.is-list .resource-card__head {
  flex: 0 0 220px; flex-direction: column; align-items: flex-start; gap: 0.5rem;
  border-right: 1px solid var(--border-color); border-bottom: none;
}
.resources-grid.is-list .resource-card__body { flex: 1; padding: 0.85rem 1rem; border-bottom: none; }
.resources-grid.is-list .resource-card__foot { flex: 0 0 auto; padding: 0.85rem 1rem; align-items: center; }

@media (max-width: 720px) {
  .resources-grid.is-list .resource-card { flex-direction: column; }
  .resources-grid.is-list .resource-card__head { flex: initial; border-right: none; border-bottom: 1px solid var(--border-color); }
}

/* Highlight */
.highlight {
  background: linear-gradient(transparent 60%, rgba(229, 76, 255, 0.45) 60%);
  color: #fff; padding: 0 1px; border-radius: 2px;
}

/* Badge (used by aurora hero count maybe) */
.badge {
  display: inline-block; padding: 0.3em 0.6em;
  font-size: 0.72em; font-weight: 700; line-height: 1;
  border-radius: var(--r-pill);
  background: rgba(30, 30, 220, 0.65); color: #fff;
}

/* ==========================================================================
   Skeleton loaders
   ========================================================================== */
.skeleton-card {
  display: flex; flex-direction: column; gap: 0.6rem;
  padding: 1rem;
  background: linear-gradient(180deg, var(--surface-2), var(--surface-1));
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
}
.sk-line, .sk-tags span {
  height: 12px; border-radius: 6px;
  background: linear-gradient(90deg, rgba(255,255,255,0.06), rgba(255,255,255,0.16), rgba(255,255,255,0.06));
  background-size: 200% 100%;
  animation: skeletonShimmer 1.4s ease infinite;
}
.sk-line--title { height: 18px; width: 60%; }
.sk-line--short { width: 40%; }
.sk-tags { display: flex; gap: 0.4rem; margin-top: 0.4rem; }
.sk-tags span { height: 18px; width: 56px; border-radius: 999px; }
@keyframes skeletonShimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ==========================================================================
   Pagination
   ========================================================================== */
.pagination-wrap {
  display: flex; align-items: center; justify-content: center;
  gap: 0.4rem; margin-top: 2rem; flex-wrap: wrap;
}
.pagination-btn, .page-num {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem;
  height: 38px; min-width: 38px; padding: 0 0.85rem;
  border-radius: var(--r-sm);
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.88rem; font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.pagination-btn:hover:not(:disabled), .page-num:hover:not(:disabled) {
  color: #fff; border-color: var(--border-strong); background: var(--surface-2);
}
.pagination-btn:disabled, .page-num:disabled { opacity: 0.45; cursor: not-allowed; }
.page-numbers { display: inline-flex; gap: 0.3rem; flex-wrap: wrap; justify-content: center; }
.page-num.is-active {
  background: var(--gradient-brand); color: #fff; border-color: transparent;
  box-shadow: 0 4px 14px rgba(229, 76, 255, 0.3);
}
.page-ellipsis {
  display: inline-flex; align-items: center; justify-content: center;
  height: 38px; min-width: 24px; color: var(--text-muted);
}
.page-info {
  text-align: center; color: var(--text-muted); font-size: 0.82rem;
  margin-top: 0.6rem;
}

/* ==========================================================================
   Empty state
   ========================================================================== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center; padding: 3.5rem 1.5rem;
  border: 1px dashed var(--border-strong);
  border-radius: var(--r-md);
  background: rgba(255,255,255,0.02);
}
.empty-state__icon {
  width: 64px; height: 64px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--gradient-brand-soft);
  border: 1px solid rgba(229,76,255,0.3);
  font-size: 1.5rem; color: #fff; margin-bottom: 1rem;
}
.empty-state__title { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.4rem; }
.empty-state__desc { color: var(--text-secondary); max-width: 420px; margin: 0 auto 1.2rem; }

/* Error state */
.error-state {
  grid-column: 1 / -1;
  background: rgba(239, 68, 68, 0.08); border: 1px solid rgba(239,68,68,0.25);
  border-radius: var(--r-md); padding: 1.25rem; text-align: center; color: #ffd9d9;
}

/* ==========================================================================
   Back to top
   ========================================================================== */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 60;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--gradient-brand); border: none; color: #fff;
  cursor: pointer; box-shadow: var(--shadow-md);
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  opacity: 0; transform: translateY(8px);
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* Spinner (existing) */
@keyframes spin { 0% { transform: rotate(0); } 100% { transform: rotate(360deg); } }

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background-color: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0; margin-top: 3rem;
  position: relative; z-index: 10;
}
footer a { color: #fff; text-decoration: none; opacity: 0.9; }
footer a:hover { color: var(--accent-1); opacity: 1; text-shadow: 0 0 8px rgba(0, 194, 255, 0.4); }

/* Visually hidden helper */
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .search-bar__inner { flex-direction: column; align-items: stretch; }
  .search-bar__filters { justify-content: flex-start; }
  .search-input-wrap { flex: 1 1 auto; }
}
@media (max-width: 640px) {
  .navbar-content { justify-content: center; }
  .navbar-actions .btn span { display: none; }
  .navbar-actions .btn { padding: 0.5rem 0.7rem; }
  .results-meta { flex-direction: column; align-items: flex-start; }
  .resources-grid { grid-template-columns: 1fr; }
  .search-input-wrap__kbd { display: none; }
  .search-input { padding-right: 56px; }
  .search-input-wrap__clear { right: 14px; }
  .back-to-top { right: 16px; bottom: 16px; }
}

/* ==========================================================================
   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;
  }
}