:root {
  color-scheme: light;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  --app-bg: #f4f6fb;
  --app-surface: #ffffff;
  --app-surface-soft: #f8fafc;
  --app-surface-tint: #eff6ff;
  --app-text: #1f2937;
  --app-muted: #475569;
  --app-line: #cbd5e1;
  --app-primary: #2563eb;
  --app-primary-strong: #1d4ed8;
  --app-primary-soft: #dbeafe;
  --app-secondary: #16a34a;
  --app-secondary-strong: #15803d;
  --app-danger: #ef4444;
  --app-danger-soft: #fca5a5;
  --app-header-bg: #101828;
  --app-header-text: #ffffff;
  --app-header-muted: #cbd5e1;
  --app-eyebrow: #a5b4fc;
  --app-pill-bg: rgba(255, 255, 255, 0.08);
  --app-pill-border: rgba(255, 255, 255, 0.18);
  --app-shadow-soft: 0 12px 30px rgba(15, 23, 42, 0.08);
  --app-shadow-strong: 0 18px 34px rgba(37, 99, 235, 0.14);
  background: var(--app-bg);
  color: var(--app-text);
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--app-bg);
  color: var(--app-text);
}

[hidden] {
  display: none !important;
}

footer {
  margin-top: auto;
  padding: 1.5rem clamp(16px, 4vw, 56px);
  background: var(--app-header-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 -1px 10px rgba(15, 23, 42, 0.12);
}

.app-footer-inner {
  width: min(1100px, 100%);
  margin: 0 auto;
  display: grid;
  justify-items: center;
  gap: 0.85rem;
  text-align: center;
}

.app-footer-title {
  color: var(--app-header-text);
  font-weight: 800;
}

.app-footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.app-footer-nav a,
.app-footer-home {
  color: var(--app-header-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
}

.app-footer-nav a {
  border: 1px solid var(--app-pill-border);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  background: var(--app-pill-bg);
}

.app-footer-nav a:hover,
.app-footer-nav a:focus-visible,
.app-footer-home:hover,
.app-footer-home:focus-visible {
  color: var(--app-header-text);
}

.app-footer-nav a[aria-current="page"] {
  color: var(--app-header-text);
  background: rgba(165, 180, 252, 0.18);
  border-color: rgba(165, 180, 252, 0.5);
}

.app-shell {
  min-height: 100vh;
}

.app-header {
  color: var(--app-header-text);
  background: var(--app-header-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 28px clamp(20px, 4vw, 56px);
}

.app-header-copy h1 {
  letter-spacing: -0.035em;
  margin: 0;
  font-size: clamp(26px, 3vw, 40px);
}

.app-header-copy p {
  color: var(--app-header-muted);
  max-width: 660px;
  margin: 8px 0 0;
}

.eyebrow {
  color: var(--app-eyebrow);
  letter-spacing: 0.18em;
  margin-bottom: 7px;
  font-size: 11px;
  font-weight: 800;
}

.privacy-pill {
  white-space: nowrap;
  background: var(--app-pill-bg);
  border: 1px solid var(--app-pill-border);
  border-radius: 999px;
  padding: 9px 13px;
  font-size: 13px;
}

main {
  flex: 1 0 auto;
  width: min(1100px, 92vw);
  margin: 2rem auto;
  display: grid;
  gap: 2rem;
}

.editor {
  display: grid;
  gap: 1rem;
  align-items: start;
  justify-items: center;
  grid-template-columns: 1fr;
}

.controls {
  display: grid;
  gap: 1.25rem;
  background: var(--app-surface);
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: var(--app-shadow-soft);
}

.bg-controls {
  display: none;
  background: var(--app-surface);
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: var(--app-shadow-soft);
}

.has-photo .bg-controls {
  display: grid;
}

.bg-card {
  display: grid;
  gap: 0.9rem;
}

.bg-card h2 {
  margin: 0;
}

.bg-card p {
  margin: 0;
  color: var(--app-muted);
  line-height: 1.5;
}

.post-upload {
  display: none;
  gap: 1.25rem;
}

.has-photo .post-upload {
  display: grid;
}

.has-photo .upload-only {
  display: none;
}

.upload-hint {
  margin: 0;
  font-weight: 600;
  color: var(--app-muted);
  text-align: center;
  max-width: 540px;
}

.upload-dropzone {
  box-sizing: border-box;
  display: grid;
  justify-items: center;
  gap: 0.45rem;
  padding: 2rem 1.4rem;
  background: linear-gradient(180deg, var(--app-surface) 0%, var(--app-surface-tint) 100%);
  color: var(--app-text);
  border-radius: 18px;
  cursor: pointer;
  font-weight: 600;
  width: 100%;
  max-width: 540px;
  border: 2px dashed var(--app-primary-soft);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.08);
  text-align: center;
  margin-inline: auto;
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease,
    box-shadow 0.18s ease;
}

.upload-dropzone:hover,
.upload-dropzone:focus-within,
.upload-dropzone.is-dragover {
  border-color: var(--app-primary);
  background: linear-gradient(180deg, var(--app-primary-soft) 0%, var(--app-surface-tint) 100%);
  transform: translateY(-1px);
  box-shadow: var(--app-shadow-strong);
}

.upload-dropzone input {
  display: none;
}

.upload-dropzone-icon {
  font-size: 2.4rem;
  color: var(--app-primary);
}

.upload-dropzone-title {
  font-size: 1.05rem;
}

.upload-dropzone-subtitle {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--app-muted);
}

.hidden-until-photo {
  display: none;
}

.has-photo .hidden-until-photo {
  display: inline-flex;
}

.instruction {
  margin: 0;
  color: var(--app-muted);
  line-height: 1.5;
}

.instruction-list {
  margin: 0;
  padding: 0 0 0 1.1rem;
  display: grid;
  gap: 0.5rem;
}

.material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 500, "GRAD" 0, "opsz" 24;
}

.download-btn {
  border: none;
  padding: 0.9rem 1.2rem;
  border-radius: 10px;
  color: var(--app-header-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.download-btn:disabled {
  cursor: not-allowed;
}

button#download-btn {
  background: var(--app-secondary);
}

button#download-btn:disabled {
  background: #9ca3af;
}

button#remove-bg-btn {
  background: var(--app-secondary);
}

button#remove-bg-btn:disabled {
  background: #9ca3af;
}

.reset-btn {
  border: none;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--app-danger);
  color: var(--app-header-text);
  cursor: pointer;
  margin-left: auto;
  white-space: nowrap;
}

.reset-btn:focus-visible {
  outline: 2px solid #991b1b;
  outline-offset: 2px;
}

.canvas-wrapper {
  display: none;
  gap: 0.75rem;
  justify-items: center;
  width: 100%;
}

.has-photo .canvas-wrapper {
  display: grid;
}

.editor-actions {
  display: none;
}

.has-photo .editor-actions {
  display: flex;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  justify-self: center;
  margin-top: 0.25rem;
}

.action-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.format-select {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--app-surface);
  border: 1px solid var(--app-line);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  font-weight: 600;
  color: var(--app-text);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
}

.has-photo .format-select.hidden-until-photo {
  display: inline-flex;
}

.format-select select {
  border: none;
  background: transparent;
  font-weight: 600;
  font-size: 0.9rem;
  color: inherit;
  cursor: pointer;
}

.format-select select:focus-visible {
  outline: 2px solid var(--app-primary);
  outline-offset: 2px;
}

.threshold-control {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  background: var(--app-surface-soft);
  border: 1px solid var(--app-line);
  border-radius: 16px;
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--app-text);
}

.threshold-control input[type="range"] {
  flex: 1;
  min-width: 180px;
}

.threshold-control select {
  border: 1px solid var(--app-line);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  background: var(--app-surface);
  font-weight: 600;
  color: inherit;
}

.threshold-control input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--app-primary);
}

.threshold-value {
  font-variant-numeric: tabular-nums;
  min-width: 3rem;
  text-align: right;
}

.bg-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.bg-actions.is-locked .download-btn:not(.undo-btn) {
  background: #9ca3af;
}

.undo-btn {
  background: var(--app-primary);
}

.undo-btn:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

.restart-btn {
  background: var(--app-danger);
}

.restart-btn:disabled {
  background: var(--app-danger-soft);
  cursor: not-allowed;
}

@media (max-width: 720px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .privacy-pill {
    white-space: normal;
  }
}

.frame {
  position: relative;
  width: 400px;
  aspect-ratio: 400 / 514;
  height: auto;
  border-radius: 12px;
  overflow: hidden;
  background: #e2e8f0;
  border: 4px solid #0f172a;
}

#photo-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

#photo-canvas:active {
  cursor: grabbing;
}

#overlay-image {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.frame-shell {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: stretch;
  gap: 0.75rem;
  padding: 0 0.5rem;
}

.frame-shell .frame,
.slider-column {
  height: 100%;
}

.slider-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem;
}

.slider-icon {
  width: 28px;
  height: 28px;
  color: #1f2937;
}

.slider-column img.slider-icon {
  object-fit: contain;
}

.vertical-slider {
  writing-mode: bt-lr;
  -webkit-appearance: slider-vertical;
  height: 100%;
  width: 28px;
  accent-color: #2563eb;
}

.hint {
  font-size: 0.9rem;
  color: #475569;
}

.notes,
.ads {
  background: #ffffff;
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.notes ul {
  padding-left: 1.2rem;
}

.ad-slot {
  border: 2px dashed #94a3b8;
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  color: #64748b;
  font-weight: 600;
}

footer small {
  color: #64748b;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 158, 11, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  padding: 1.5rem;
  z-index: 50;
}

.modal-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 1.5rem;
  max-width: 420px;
  width: min(90vw, 420px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.2);
}

.modal-card h2 {
  margin-top: 0;
  margin-bottom: 0.6rem;
}

.modal-card p {
  margin: 0;
  color: #475569;
  line-height: 1.5;
}

.modal-actions {
  margin-top: 1.25rem;
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.modal-btn {
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.2rem;
  font-weight: 600;
  cursor: pointer;
}

.modal-btn.primary {
  background: #f97316;
  color: #ffffff;
}

.modal-btn.secondary {
  background: #e2e8f0;
  color: #1f2937;
}

.toast {
  display: none;
  margin: 0;
  padding: 0.65rem 0.9rem;
  border-radius: 12px;
  background: #fee2e2;
  border: 1px solid #fca5a5;
  color: #b91c1c;
  font-weight: 600;
}

.toast.is-visible {
  display: block;
}

.processing-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(15, 23, 42, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 60;
}

.processing-overlay.is-active {
  opacity: 1;
  pointer-events: auto;
}

.processing-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: #ffffff;
  border-radius: 999px;
  padding: 0.75rem 1.25rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.2);
  font-weight: 600;
  color: #1f2937;
}

.processing-icon {
  font-size: 2rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 640px) {
  main {
    margin: 1.5rem auto;
  }

  .frame {
    width: 68vw;
  }

  .frame-shell {
    gap: 0.5rem;
    padding: 0 0.75rem;
  }

  .frame-shell {
    gap: 0.5rem;
  }

  .format-select {
    padding: 0.35rem 0.6rem;
    font-size: 0.85rem;
  }

  .format-select select {
    font-size: 0.85rem;
  }
}

@media (min-width: 900px) {
  .has-photo .editor {
    grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
    grid-template-areas:
      "bg-controls canvas"
      "actions canvas";
  }

  .has-photo .canvas-wrapper {
    grid-area: canvas;
  }

  .has-photo .bg-controls {
    grid-area: bg-controls;
    align-self: start;
  }

  .has-photo .editor-actions {
    grid-area: actions;
    justify-content: center;
  }
}