/* ═══════════════════════════════════════════════════
   Wallpaper App — CSS
   Dark modern theme · Masonry grid · Responsive
   ═══════════════════════════════════════════════════ */

/* ── Custom Properties ── */
:root {
  --bg:           #0f0f13;
  --bg-2:         #17171d;
  --bg-3:         #1f1f28;
  --bg-4:         #27272f;
  --border:       rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.15);

  --text:         #f0f0f5;
  --text-2:       #a0a0b8;
  --text-3:       #606078;

  --accent:       #6c63ff;
  --accent-2:     #00d4ff;
  --accent-grad:  linear-gradient(135deg, #6c63ff, #00d4ff);
  --accent-glow:  rgba(108, 99, 255, 0.35);

  --success:      #22c55e;
  --danger:       #ef4444;

  --radius-sm:    8px;
  --radius:       14px;
  --radius-lg:    20px;
  --radius-xl:    28px;

  --shadow:       0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg:    0 16px 60px rgba(0,0,0,0.7);

  --header-h:     64px;
  --filter-h:     52px;

  --trans:        0.2s ease;
  --trans-slow:   0.4s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  line-height: 1.5;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
svg { display: block; flex-shrink: 0; }

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(15, 15, 19, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.header__inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

/* ── Logo ── */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  transition: opacity var(--trans);
}
.logo:hover { opacity: 0.8; }

.logo__icon { width: 32px; height: 32px; border-radius: 8px; }
.logo--small .logo__icon { width: 26px; height: 26px; }

.logo__text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.logo--small .logo__text { font-size: 0.95rem; }

/* ── Header Controls ── */
.header__controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ── Orientation Toggle ── */
.orientation-toggle {
  display: flex;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
  gap: 2px;
}

.orientation-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: calc(var(--radius) - 4px);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  transition: all var(--trans);
  white-space: nowrap;
}
.orientation-btn svg { width: 16px; height: 16px; }
.orientation-btn span { display: none; }

.orientation-btn.active {
  background: var(--accent-grad);
  color: white;
  box-shadow: 0 2px 8px var(--accent-glow);
}
.orientation-btn:not(.active):hover {
  color: var(--text);
  background: var(--bg-4);
}

@media (min-width: 480px) {
  .orientation-btn span { display: inline; }
}

/* ── Filter Bar ── */
.filter-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 90;
  background: rgba(15, 15, 19, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.filter-bar,
.tag-section {
  display: none;
}

.filter-bar__inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 20px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.filter-bar__inner::-webkit-scrollbar { display: none; }

.filter-chips {
  display: flex;
  gap: 8px;
  padding: 10px 0;
  width: max-content;
  min-width: 100%;
}

/* ── Filter Chip ── */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-2);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--trans);
  user-select: none;
}
.chip:hover {
  border-color: var(--border-hover);
  color: var(--text);
}
.chip.active {
  background: var(--accent-grad);
  border-color: transparent;
  color: white;
  box-shadow: 0 2px 12px var(--accent-glow);
}
.chip__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: rgba(255,255,255,0.15);
  border-radius: 999px;
  font-size: 0.7rem;
}

/* ── Tag Section ── */
.tag-section {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.tag-section__inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 20px;
}

.tag-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 0;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-3);
  transition: color var(--trans);
}
.tag-toggle svg { width: 16px; height: 16px; }
.tag-toggle:hover { color: var(--text-2); }
.tag-toggle__caret {
  width: 16px; height: 16px;
  transition: transform var(--trans);
}
.tag-toggle[aria-expanded="true"] .tag-toggle__caret {
  transform: rotate(180deg);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 0 12px;
}
.tag-cloud[hidden] { display: none; }

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-3);
  cursor: pointer;
  transition: all var(--trans);
}
.tag-pill:hover { color: var(--text-2); border-color: var(--border-hover); }
.tag-pill.active {
  background: rgba(108, 99, 255, 0.15);
  border-color: var(--accent);
  color: #a89fff;
}

/* ── Main / Results Bar ── */
.main {
  max-width: 1600px;
  margin: 0 auto;
  padding: 20px;
}

.results-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  min-height: 28px;
}

#resultsCount {
  font-size: 0.82rem;
  color: var(--text-3);
}

.clear-filters-btn {
  font-size: 0.8rem;
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid rgba(108,99,255,0.3);
  transition: all var(--trans);
}
.clear-filters-btn:hover {
  background: rgba(108,99,255,0.1);
}

/* ── Masonry Grid ── */
.masonry {
  columns: 2;
  column-gap: 12px;
}

@media (min-width: 640px)  { .masonry { columns: 3; column-gap: 14px; } }
@media (min-width: 960px)  { .masonry { columns: 4; column-gap: 16px; } }
@media (min-width: 1280px) { .masonry { columns: 5; column-gap: 16px; } }
@media (min-width: 1600px) { .masonry { columns: 6; column-gap: 18px; } }

/* ── Wallpaper Card ── */
.card {
  break-inside: avoid;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
  background: var(--bg-3);
  cursor: pointer;
  border: 1px solid var(--border);
  transition: transform var(--trans), box-shadow var(--trans), border-color var(--trans);
  will-change: transform;
}

@media (min-width: 640px) { .card { margin-bottom: 14px; } }
@media (min-width: 960px) { .card { margin-bottom: 16px; } }

.card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
  z-index: 1;
}

.card__image-wrap {
  position: relative;
  overflow: hidden;
  line-height: 0;
}

.card__image {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.45s ease;
  opacity: 0;
  transition: opacity 0.35s ease, transform 0.45s ease;
}
.card__image.loaded { opacity: 1; }
.card:hover .card__image { transform: scale(1.05); }

/* Image placeholder shimmer while loading */
.card__image-wrap::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    var(--bg-3) 0%,
    var(--bg-4) 50%,
    var(--bg-3) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  z-index: 0;
  transition: opacity 0.3s ease;
}
.card__image.loaded ~ .card__image-wrap::before,
.card__image-wrap:has(.card__image.loaded)::before {
  opacity: 0;
  pointer-events: none;
}

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

/* Card Overlay */
.card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0,0,0,0.75) 0%,
    rgba(0,0,0,0.2) 40%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity var(--trans);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 14px;
  pointer-events: none;
}
.card:hover .card__overlay,
.card:focus-visible .card__overlay {
  opacity: 1;
}

.card__title {
  font-size: 0.82rem;
  font-weight: 600;
  color: white;
  line-height: 1.3;
  margin-bottom: 4px;
}
.card__meta {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.6);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card__category-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(0,0,0,0.5);
  color: rgba(255,255,255,0.8);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.12);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--trans), transform var(--trans);
}
.card:hover .card__category-badge {
  opacity: 1;
  transform: translateY(0);
}

.card__download-hint {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(108,99,255,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--trans), transform var(--trans);
  backdrop-filter: blur(6px);
}
.card__download-hint svg { width: 14px; height: 14px; }
.card:hover .card__download-hint {
  opacity: 1;
  transform: scale(1);
}

.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Skeleton Grid ── */
.skeleton-grid {
  columns: 2;
  column-gap: 12px;
}
@media (min-width: 640px)  { .skeleton-grid { columns: 3; column-gap: 14px; } }
@media (min-width: 960px)  { .skeleton-grid { columns: 4; column-gap: 16px; } }
@media (min-width: 1280px) { .skeleton-grid { columns: 5; column-gap: 16px; } }

.skeleton-card {
  break-inside: avoid;
  height: var(--h, 280px);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: linear-gradient(
    90deg,
    var(--bg-3) 0%,
    var(--bg-4) 50%,
    var(--bg-3) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
.skeleton-grid[hidden] { display: none; }

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-3);
}
.empty-state[hidden] { display: none; }
.empty-state svg {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  color: var(--text-3);
}
.empty-state h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 8px;
}
.empty-state p {
  font-size: 0.9rem;
  color: var(--text-3);
}

.load-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 24px 0;
  color: var(--text-2);
  font-size: 0.92rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.load-indicator__spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--border);
  border-top-color: transparent;
  border-radius: 50%;
  animation: loaderSpin 0.9s linear infinite;
}
.load-indicator[hidden] { display: none; }

.link-btn {
  color: var(--accent);
  text-decoration: underline;
  font: inherit;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.2s ease;
}
.modal-overlay[hidden] { display: none; }

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

@keyframes loaderSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.modal {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 900px;
  max-height: 92dvh;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-4) transparent;
  animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal__close {
  position: sticky;
  top: 12px;
  float: right;
  margin: 12px 12px 0 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  z-index: 10;
  transition: background var(--trans), transform var(--trans);
}
.modal__close svg { width: 18px; height: 18px; }
.modal__close:hover {
  background: rgba(239,68,68,0.7);
  transform: scale(1.1);
}

.modal__image-wrap {
  position: relative;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
  background: var(--bg-3);
  clear: right;
}
.modal__image {
  width: 100%;
  height: auto;
  max-height: 60vh;
  object-fit: contain;
  display: block;
  transition: opacity 0.35s ease;
}
.modal__image-skeleton {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-3) 0%, var(--bg-4) 50%, var(--bg-3) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  transition: opacity 0.3s ease;
}
.modal__image.loaded + .modal__image-skeleton {
  opacity: 0;
  pointer-events: none;
}

.modal__info {
  padding: 20px 24px 28px;
}

.modal__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.modal__category {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(108,99,255,0.2);
  color: #a89fff;
  border: 1px solid rgba(108,99,255,0.3);
}

.modal__resolution {
  font-size: 0.75rem;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}

.modal__title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
  color: var(--text);
}

.modal__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}
.modal__tag {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--trans);
}
.modal__tag:hover {
  border-color: var(--accent);
  color: #a89fff;
  background: rgba(108,99,255,0.1);
}

.modal__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--trans);
  white-space: nowrap;
  cursor: pointer;
  border: none;
}
.btn svg { width: 18px; height: 18px; }

.btn--primary {
  background: var(--accent-grad);
  color: white;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn--primary:hover {
  box-shadow: 0 6px 24px var(--accent-glow);
  transform: translateY(-1px);
  opacity: 0.92;
}
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  background: var(--bg-3);
  color: var(--text-2);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: var(--radius);
}
.btn--ghost:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-4);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  z-index: 300;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ── Focus Styles ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Card enter animation ── */
.card {
  animation: cardIn 0.35s ease both;
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Stagger via nth-child — first 20 visible items */
.card:nth-child(1)  { animation-delay: 0.02s; }
.card:nth-child(2)  { animation-delay: 0.04s; }
.card:nth-child(3)  { animation-delay: 0.06s; }
.card:nth-child(4)  { animation-delay: 0.08s; }
.card:nth-child(5)  { animation-delay: 0.10s; }
.card:nth-child(6)  { animation-delay: 0.12s; }
.card:nth-child(7)  { animation-delay: 0.14s; }
.card:nth-child(8)  { animation-delay: 0.16s; }
.card:nth-child(9)  { animation-delay: 0.18s; }
.card:nth-child(10) { animation-delay: 0.20s; }
.card:nth-child(11) { animation-delay: 0.22s; }
.card:nth-child(12) { animation-delay: 0.24s; }