/* ========== RESET & VARIABLES ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #253349;
  --bg-elevated: #334155;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-dim: rgba(56, 189, 248, 0.15);
  --success: #22c55e;
  --success-dim: rgba(34, 197, 94, 0.12);
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #334155;
  --border-light: #475569;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.4), 0 4px 10px rgba(0,0,0,0.3);
  --transition: 0.2s ease;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-elevated: #e2e8f0;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #0ea5e9;
  --accent-hover: #0284c7;
  --accent-dim: rgba(14, 165, 233, 0.1);
  --success: #16a34a;
  --success-dim: rgba(22, 163, 74, 0.1);
  --border: #e2e8f0;
  --border-light: #cbd5e1;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ========== CONTAINER ========== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

@media (min-width: 600px) {
  .container { padding: 0 24px; }
}

/* ========== HEADER ========== */
.header {
  padding: 16px 0 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  gap: 12px;
}

.header__brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

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

.header__logo svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.header__logo h1 {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent), var(--success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.header__tagline {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: none;
}

@media (min-width: 480px) {
  .header { padding: 20px 0 0; }
  .header__inner { padding-bottom: 16px; }
  .header__logo h1 { font-size: 1.35rem; }
  .header__tagline { display: block; }
}

@media (min-width: 768px) {
  .header { padding: 24px 0 0; }
  .header__inner { padding-bottom: 20px; gap: 16px; }
  .header__logo svg { width: 32px; height: 32px; }
  .header__logo h1 { font-size: 1.5rem; }
}

/* ========== THEME TOGGLE ========== */
.theme-toggle {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

[data-theme="dark"] .theme-toggle__icon--sun { display: block; }
[data-theme="dark"] .theme-toggle__icon--moon { display: none; }
[data-theme="light"] .theme-toggle__icon--sun { display: none; }
[data-theme="light"] .theme-toggle__icon--moon { display: block; }

/* ========== MAIN ========== */
.main {
  padding: 24px 0 40px;
}

@media (min-width: 600px) {
  .main { padding: 32px 0 60px; }
}

/* ========== UPLOAD ZONE ========== */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.upload-zone.drag-over {
  transform: scale(1.01);
}

.upload-zone__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}

.upload-zone__icon {
  color: var(--text-muted);
  transition: var(--transition);
}

.upload-zone__icon svg {
  width: 40px;
  height: 40px;
}

.upload-zone.drag-over .upload-zone__icon,
.upload-zone:hover .upload-zone__icon {
  color: var(--accent);
  transform: translateY(-4px);
}

.upload-zone__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.upload-zone__subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.upload-zone .btn {
  pointer-events: auto;
  margin-top: 4px;
}

@media (min-width: 600px) {
  .upload-zone { padding: 48px 24px; border-radius: var(--radius-lg); }
  .upload-zone__icon svg { width: 48px; height: 48px; }
  .upload-zone__title { font-size: 1.2rem; }
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
  white-space: nowrap;
  min-height: 44px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

.btn--primary.loading {
  pointer-events: none;
  opacity: 0.8;
}

.btn--secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 12px 16px;
}

.btn--ghost:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

.btn--small {
  padding: 8px 14px;
  font-size: 0.85rem;
  min-height: 38px;
}

.btn--success {
  background: var(--success);
  color: #fff;
}

.btn--success:hover:not(:disabled) {
  background: #16a34a;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

/* ========== CONTROLS ========== */
.controls {
  margin-top: 20px;
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: fadeUp 0.3s ease;
}

.controls__row {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.controls__group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.controls__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.controls__slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-elevated);
  outline: none;
  cursor: pointer;
}

.controls__slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 6px var(--accent);
  transition: var(--transition);
}

.controls__slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.controls__slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.controls__presets {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 2px;
}

.preset-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
  flex-shrink: 0;
}

.preset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.preset-btn--active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.controls__select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
  min-height: 44px;
}

.controls__select:focus {
  border-color: var(--accent);
}

.controls__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.controls__actions .btn {
  width: 100%;
  justify-content: center;
}

@media (min-width: 600px) {
  .controls { padding: 20px 24px; margin-top: 24px; gap: 20px; }
  .controls__row { flex-direction: row; gap: 20px; }
  .controls__actions { flex-direction: row; }
  .controls__actions .btn { width: auto; }
}

@media (min-width: 768px) {
  .controls__group { min-width: 160px; }
}

/* ========== GALLERY ========== */
.gallery {
  margin-top: 20px;
  animation: fadeUp 0.3s ease;
}

.gallery__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.gallery__title {
  font-size: 1rem;
  font-weight: 700;
}

.gallery__count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.gallery__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 600px) {
  .gallery { margin-top: 28px; }
  .gallery__header { margin-bottom: 16px; }
  .gallery__title { font-size: 1.1rem; }
  .gallery__grid { gap: 16px; grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .gallery__grid { grid-template-columns: repeat(3, 1fr); }
}

/* ========== IMAGE CARD ========== */
.image-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  animation: fadeIn 0.35s ease;
}

.image-card:hover {
  border-color: var(--border-light);
  box-shadow: var(--shadow);
}

.image-card__img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg);
  overflow: hidden;
}

.image-card__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.image-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.image-card:hover .image-card__overlay,
.image-card:focus-within .image-card__overlay {
  opacity: 1;
}

.image-card__overlay-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
  min-height: 44px;
}

.image-card__overlay-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.image-card__info {
  padding: 10px 12px;
}

.image-card__name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.image-card__stats {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.image-card__stat {
  display: flex;
  align-items: center;
  gap: 4px;
}

.stat-value {
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-saved {
  color: var(--success);
  font-weight: 700;
  font-size: 0.85rem;
}

.stat-original {
  font-size: 0.7rem;
  text-decoration: line-through;
  opacity: 0.6;
}

.image-card__badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.image-card__badge--success {
  background: var(--success-dim);
  color: var(--success);
}

.image-card__badge--pending {
  background: rgba(245, 158, 11, 0.12);
  color: var(--warning);
}

/* progress bar */
.image-card__progress {
  height: 3px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
  margin: 0 12px 8px;
}

.image-card__progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.image-card__progress-bar.complete {
  background: var(--success);
}

/* toggle */
.image-card__toggle {
  display: flex;
  gap: 0;
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.image-card__toggle-btn {
  flex: 1;
  padding: 8px 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
  min-height: 38px;
}

.image-card__toggle-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
}

.image-card__toggle-btn:first-child {
  border-right: 1px solid var(--border);
}

@media (min-width: 600px) {
  .image-card__info { padding: 12px 14px; }
  .image-card__progress { margin: 0 14px 10px; }
}

/* ========== EMPTY STATE ========== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.empty-state svg {
  width: 56px;
  height: 56px;
}

.empty-state p {
  font-size: 0.95rem;
  line-height: 1.5;
}

@media (min-width: 600px) {
  .empty-state { padding: 48px 24px; }
  .empty-state svg { width: 64px; height: 64px; }
}

/* ========== TOAST ========== */
.toast-container {
  position: fixed;
  bottom: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1000;
  pointer-events: none;
  align-items: stretch;
}

.toast {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease;
  pointer-events: auto;
  text-align: center;
}

.toast--success { background: var(--success); }
.toast--error { background: var(--danger); }
.toast--warning { background: var(--warning); }
.toast--info { background: var(--accent); }

.toast.toast--hiding {
  opacity: 0;
  transform: translateY(10px);
}

@media (min-width: 600px) {
  .toast-container {
    left: auto;
    right: 24px;
    bottom: 24px;
    align-items: flex-end;
    max-width: 360px;
  }
  .toast { text-align: left; }
}

/* ========== PREVIEW MODAL ========== */
.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.preview-modal[hidden] { display: none; }

.preview-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.85);
  cursor: pointer;
}

.preview-modal__container {
  position: relative;
  width: 95vw;
  height: 90vh;
  max-width: 1200px;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  animation: fadeUp 0.25s ease;
}

.preview-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.preview-modal__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 12px;
}

.preview-modal__counter {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.preview-modal__actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.preview-modal__btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}

.preview-modal__btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.preview-modal__body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  min-height: 0;
}

.preview-modal__img-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: relative;
}

.preview-modal__zoom-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.75rem;
  padding: 6px 14px;
  border-radius: 20px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.preview-modal__img-wrap:hover .preview-modal__zoom-hint {
  opacity: 1;
}

.preview-modal__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
  opacity: 0.6;
  font-family: var(--font);
}

.preview-modal__nav:hover {
  opacity: 1;
  background: rgba(0,0,0,0.75);
  border-color: var(--accent);
  color: var(--accent);
}

.preview-modal__nav--prev { left: 12px; }
.preview-modal__nav--next { right: 12px; }

.preview-modal__nav[hidden] { display: none; }

.preview-modal__footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.preview-modal__footer span {
  white-space: nowrap;
}

@media (min-width: 600px) {
  .preview-modal__container { width: 90vw; height: 85vh; }
  .preview-modal__header { padding: 14px 20px; }
  .preview-modal__title { font-size: 1rem; }
  .preview-modal__counter { font-size: 0.85rem; }
  .preview-modal__footer { padding: 12px 20px; gap: 28px; font-size: 0.85rem; }
  .preview-modal__nav { width: 48px; height: 48px; }
  .preview-modal__nav--prev { left: 20px; }
  .preview-modal__nav--next { right: 20px; }
  .preview-modal__zoom-controls { bottom: 24px; padding: 8px 14px; gap: 8px; }
  .preview-modal__zoom-btn { width: 36px; height: 36px; font-size: 1.3rem; }
  .preview-modal__zoom-level { font-size: 0.85rem; min-width: 48px; }
  .preview-modal__zoom-indicator { top: 20px; right: 20px; font-size: 0.9rem; }
  .preview-modal__compare-label { font-size: 0.8rem; padding: 5px 14px; }
  .preview-modal__compare-label--orig { top: 16px; left: 16px; }
  .preview-modal__compare-label--comp { top: 16px; right: 16px; }
}

.preview-modal__btn--active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.preview-modal__img-stack {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-modal__img-orig {
  position: absolute;
  inset: 0;
  margin: auto;
  max-width: 100%;
  max-height: 100%;
  display: block;
  user-select: none;
  -webkit-user-select: none;
  clip-path: inset(0 50% 0 0);
  pointer-events: none;
}

.preview-modal__img-stack--sliding .preview-modal__img-comp,
.preview-modal__img-stack--sliding .preview-modal__img-orig {
  transition: none;
}

.preview-modal__img-comp {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  cursor: grab;
  transition: transform 0.15s ease;
  user-select: none;
  -webkit-user-select: none;
}

.preview-modal__img-comp.dragging {
  cursor: grabbing;
}

.preview-modal__slider {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
  background: #fff;
  left: 50%;
  z-index: 20;
  cursor: ew-resize;
  pointer-events: auto;
  box-shadow: 0 0 6px rgba(0,0,0,0.5);
}

.preview-modal__slider-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  cursor: ew-resize;
}

.preview-modal__slider-handle::before,
.preview-modal__slider-handle::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 2px;
  height: 16px;
  background: #888;
  border-radius: 1px;
}

.preview-modal__slider-handle::before { left: 9px; }
.preview-modal__slider-handle::after { right: 9px; }

.preview-modal__compare-label {
  position: absolute;
  z-index: 15;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 12px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.preview-modal__img-stack--compare .preview-modal__compare-label {
  opacity: 1;
}

.preview-modal__compare-label--orig {
  top: 12px;
  left: 12px;
}

.preview-modal__compare-label--comp {
  top: 12px;
  right: 12px;
}

.preview-modal__zoom-controls {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 6px 10px;
  border-radius: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 25;
  border: 1px solid rgba(255,255,255,0.1);
}

.preview-modal__img-wrap:hover .preview-modal__zoom-controls,
.preview-modal__zoom-controls--visible {
  opacity: 1;
  pointer-events: auto;
}

.preview-modal__zoom-hint:not([hidden]) {
  display: block;
}

.preview-modal__zoom-hint[hidden] {
  display: none;
}

.preview-modal__zoom-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background 0.2s ease;
  font-family: var(--font);
  line-height: 1;
}

.preview-modal__zoom-btn:hover {
  background: rgba(255,255,255,0.15);
}

.preview-modal__zoom-btn--reset {
  font-size: 0.75rem;
  width: auto;
  padding: 0 10px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.2);
}

.preview-modal__zoom-btn--reset:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.preview-modal__zoom-level {
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 44px;
  text-align: center;
}

.preview-modal__zoom-indicator {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 25;
}

.preview-modal__zoom-indicator--visible {
  opacity: 1;
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ════════════════════════════════════════════════════════
   AD CONTAINERS
   ════════════════════════════════════════════════════════
   min-height prevents layout shift while ads load.
*/
.ad-container {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  text-align: center;
}

.ad-container--top {
  min-height: 90px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.ad-container--bottom {
  min-height: 90px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.ad-container--native {
  min-height: 60px;
  padding: 8px 0;
  margin: 16px 0 8px;
  border-top: 1px dashed var(--border);
  border-bottom: 1px dashed var(--border);
}

.ad-container ins,
.ad-container iframe {
  max-width: 100%;
}

.ad-container:empty { display: none; }

/* ════════════════════════════════════════════════════════
   SEO CONTENT (visually hidden — indexable by crawlers)
   ════════════════════════════════════════════════════════
   Screen-reader accessible via .sr-only pattern.
*/
.seo-content {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ════════════════════════════════════════════════════════
   HERO SUMMARY — visible TL;DR / definition block
   ════════════════════════════════════════════════════════ */
.hero-summary {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

.hero-summary__block {
  border-left: 4px solid var(--accent);
  padding: 10px 16px;
  margin: 0;
  background: var(--accent-dim);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
}

.hero-summary__block p {
  margin: 0;
}

.hero-summary__block strong {
  color: var(--accent);
}

.hero-summary__stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
  padding: 0 16px;
}

.hero-summary__stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.hero-summary__stat svg {
  flex-shrink: 0;
}

@media (min-width: 600px) {
  .hero-summary { padding: 20px 0; }
  .hero-summary__block { font-size: 1rem; padding: 12px 20px; }
  .hero-summary__stats { gap: 24px; padding: 0 20px; margin-top: 14px; }
  .hero-summary__stat { font-size: 0.85rem; }
}

/* ════════════════════════════════════════════════════════
   VISIBLE SEO CONTENT — features, table, FAQ
   ════════════════════════════════════════════════════════ */
.seo-visible {
  padding: 28px 0 36px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.seo-visible h2 {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text);
}

.seo-visible h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}

.section-spacer {
  margin-top: 28px;
}

/* features list */
.features__list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.features__list li {
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.features__list li strong {
  color: var(--text);
}

/* comparison table */
.comparison__table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.comparison__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  min-width: 420px;
}

.comparison__table th {
  text-align: left;
  padding: 10px 12px;
  background: var(--bg-elevated);
  color: var(--text);
  font-weight: 700;
  border-bottom: 2px solid var(--accent);
}

.comparison__table th:first-child {
  border-radius: var(--radius-sm) 0 0 0;
}

.comparison__table th:last-child {
  border-radius: 0 var(--radius-sm) 0 0;
}

.comparison__table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.comparison__table tr:last-child td {
  border-bottom: none;
}

.comparison__table tr:hover td {
  background: var(--accent-dim);
}

.comparison__table td:first-child {
  font-weight: 600;
  color: var(--text);
}

/* badge */
.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 10px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  vertical-align: middle;
  margin-left: 4px;
}

.badge--accent {
  background: var(--accent-dim);
  color: var(--accent);
}

/* FAQ accordion */
.faq-section {
  max-width: 800px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
  background: var(--bg);
  transition: border-color var(--transition);
}

.faq-item[open] {
  border-color: var(--accent);
}

.faq-item__question {
  padding: 12px 14px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  -webkit-user-select: none;
  list-style: none;
  transition: color var(--transition);
}

.faq-item__question::-webkit-details-marker {
  display: none;
}

.faq-item__question::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  transition: all var(--transition);
}

.faq-item[open] .faq-item__question::before {
  content: "−";
  background: var(--accent-dim);
  color: var(--accent);
}

.faq-item__question:hover {
  color: var(--accent);
}

.faq-item__answer {
  padding: 0 14px 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border);
  margin-top: 0;
  padding-top: 10px;
}

.faq-item__answer p {
  margin: 0;
}

.faq-item__answer strong {
  color: var(--text);
}

@media (min-width: 600px) {
  .seo-visible { padding: 40px 0 48px; }
  .seo-visible h2 { font-size: 1.35rem; margin-bottom: 20px; }
  .seo-visible h3 { font-size: 1.1rem; }
  .section-spacer { margin-top: 36px; }
  .features__list { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
  .features__list li { font-size: 0.9rem; padding: 14px 16px; }
  .comparison__table { font-size: 0.85rem; min-width: 480px; }
  .faq-item { margin-bottom: 10px; }
  .faq-item__question { font-size: 0.95rem; padding: 14px 18px; }
  .faq-item__answer { font-size: 0.9rem; padding: 0 18px 14px; padding-top: 12px; }
}

/* ═══ FOOTER ═══ */
.footer {
  padding: 20px 16px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.footer p { margin: 0; }
.footer strong { color: var(--text-secondary); }

.footer__nav {
  margin-top: 8px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.footer__nav a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-size: 0.8rem;
  transition: color var(--transition);
}

.footer__nav a:hover {
  color: var(--accent);
}

/* ════════════════════════════════════════════════════════
   COOKIE CONSENT BANNER
   ════════════════════════════════════════════════════════ */
.cookie-consent {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 999;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
  animation: fadeUp 0.35s ease;
}

.cookie-consent--hidden {
  display: none;
}

.cookie-consent__text {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  text-align: center;
}

.cookie-consent__text a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cookie-consent__actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.cookie-consent__actions .btn {
  min-height: 38px;
  padding: 8px 16px;
  font-size: 0.85rem;
}

@media (min-width: 600px) {
  .cookie-consent {
    flex-direction: row;
    justify-content: space-between;
    padding: 16px 24px;
  }
  .cookie-consent__text { text-align: left; font-size: 0.85rem; }
}

/* ════════════════════════════════════════════════════════
   PRIVACY PAGE
   ════════════════════════════════════════════════════════ */
.privacy-page { background: var(--bg); }

.privacy-page main h1 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
  color: var(--text);
}

.privacy-page main h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 24px;
  margin-bottom: 8px;
  color: var(--text);
}

.privacy-page main p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.privacy-page main a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.privacy-page .header__brand a {
  text-decoration: none;
}

@media (min-width: 600px) {
  .privacy-page main h1 { font-size: 1.75rem; }
  .privacy-page main h2 { font-size: 1.15rem; margin-top: 32px; }
  .privacy-page main p { font-size: 0.95rem; }
}