:root {
  --color-bg: #f6f7f4;
  --color-surface: #ffffff;
  --color-surface-soft: #edf3ef;
  --color-surface-warm: #f1f0e9;
  --color-text: #15231e;
  --color-text-muted: #56645e;
  --color-text-subtle: #5f6d66;
  --color-primary: #0e7468;
  --color-primary-hover: #0a5d54;
  --color-primary-soft: #e2f2ed;
  --color-border: #dbe5df;
  --color-border-strong: #b8cbc1;
  --color-danger: #b42318;
  --color-danger-soft: #fef0ee;
  --color-success: #146c45;
  --color-success-soft: #eaf6ef;
  --focus-ring: #0e7468;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --shadow-border: 0 0 0 1px rgba(21, 35, 30, .06), 0 2px 5px rgba(21, 35, 30, .04);
  --shadow-border-hover: 0 0 0 1px rgba(14, 116, 104, .18), 0 5px 14px rgba(21, 35, 30, .08);
  --max-content: 1120px;
  --max-reading: 760px;
}

* { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  margin: 0;
  min-width: 320px;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: rgba(14, 116, 104, .14); }
a {
  color: var(--color-primary);
  text-underline-position: from-font;
  text-decoration-thickness: from-font;
}
a:hover { color: var(--color-primary-hover); }
::selection { color: #fff; background: var(--color-primary); }
.container { width: min(100% - 32px, var(--max-content)); margin-inline: auto; }

h1, h2, h3, p { overflow-wrap: break-word; }
h1, h2, h3 { margin-block-start: 0; }
h1 {
  max-width: 17ch;
  margin-block-end: 18px;
  font-size: clamp(2.25rem, 4.5vw, 4rem);
  line-height: 1.06;
  letter-spacing: -.045em;
  text-wrap: balance;
}
h2 { font-size: clamp(1.55rem, 2.4vw, 2.1rem); line-height: 1.15; letter-spacing: -.025em; text-wrap: balance; }
h3 { font-size: 1.05rem; line-height: 1.3; }
p { text-wrap: pretty; }

.skip-link {
  position: absolute;
  inset-inline-start: -999px;
  top: 12px;
  z-index: 100;
  padding: 10px 14px;
  color: #fff;
  background: var(--color-primary-hover);
  border-radius: var(--radius-sm);
}
.skip-link:focus { inset-inline-start: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 247, 244, .96);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 64px;
}
.site-header .container:not(.header-inner) { display: flex; align-items: center; min-height: 64px; }
.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-text);
  font-size: 17px;
  font-weight: 750;
  letter-spacing: -.02em;
  text-decoration: none;
  white-space: nowrap;
}
.brand .dot { color: var(--color-primary); }
.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px 14px;
  margin-inline-start: auto;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-inline: 4px;
  color: var(--color-text-muted);
  font-size: .875rem;
  text-decoration: none;
}
.site-nav a:hover { color: var(--color-primary); }

main { padding-block: 54px 84px; }
.page-shell { display: block; }
.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
  align-items: start;
  gap: clamp(40px, 7vw, 88px);
}
.tool-panel, .proof-panel { min-width: 0; }
.hero-copy { max-width: 620px; }
.eyebrow {
  margin: 0 0 12px;
  color: var(--color-primary);
  font-size: .75rem;
  font-weight: 750;
  letter-spacing: .105em;
  line-height: 1.2;
  text-transform: uppercase;
}
.subtitle {
  max-width: 58ch;
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.06rem;
  line-height: 1.55;
}
.value-line {
  margin: 20px 0 0;
  color: var(--color-text);
  font-size: .95rem;
  font-weight: 650;
}
.value-line span { color: var(--color-primary); padding-inline: 5px; }
.stage { margin-top: 28px; }
.stage[hidden], .next-steps[hidden] { display: none; }

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 238px;
  padding: 28px 22px;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-border);
  cursor: pointer;
  text-align: center;
  touch-action: manipulation;
  transition-property: background-color, border-color, box-shadow, scale;
  transition-duration: 160ms;
  transition-timing-function: ease-out;
}
.upload-zone:hover, .upload-zone.dragover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-border-hover);
}
.upload-zone:active { scale: .99; }
.upload-icon-wrap {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  margin-bottom: 16px;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 50%;
}
.upload-icon { width: 25px; height: 25px; }
.upload-title { font-size: 1.12rem; font-weight: 750; line-height: 1.25; }
.upload-hint { margin-top: 8px; color: var(--color-text-muted); font-size: .9rem; }
.upload-action {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  margin-top: 18px;
  padding-inline: 16px;
  color: var(--color-primary-hover);
  background: #fff;
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 700;
}
.privacy-line {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  max-width: 60ch;
  margin: 16px 0 0;
  color: var(--color-text-muted);
  font-size: .83rem;
  line-height: 1.45;
}
.privacy-line svg { flex: 0 0 auto; margin-top: 1px; color: var(--color-primary); }
.shoot-tip {
  max-width: 60ch;
  margin: 12px 0 0;
  color: var(--color-text-subtle);
  font-size: .86rem;
  line-height: 1.45;
}
.shoot-tip strong { color: var(--color-text-muted); }

.proof-panel {
  padding-block-start: 52px;
}
.proof-panel h2 { max-width: 16ch; margin-bottom: 28px; }
.transformation-proof {
  margin: 0;
  padding-block: 24px 18px;
  border-block: 1px solid var(--color-border);
}
.proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}
.proof-item { min-width: 0; }
.proof-label {
  margin-bottom: 9px;
  color: var(--color-text);
  font-size: .82rem;
  font-weight: 750;
}
.proof-paper, .proof-transparent {
  display: grid;
  place-items: center;
  aspect-ratio: 1.45;
  overflow: hidden;
  border-radius: var(--radius-md);
}
.proof-paper {
  position: relative;
  background: #fff;
  box-shadow: 8px 10px 0 rgba(41, 54, 46, .08), 0 0 0 1px rgba(21, 35, 30, .08);
}
.proof-transparent {
  background-color: #fff;
  background-image: linear-gradient(45deg, #e6ece8 25%, transparent 25%), linear-gradient(-45deg, #e6ece8 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e6ece8 75%), linear-gradient(-45deg, transparent 75%, #e6ece8 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
  box-shadow: inset 0 0 0 1px rgba(21, 35, 30, .08);
}
.proof-photo { display: block; width: 100%; height: 100%; object-fit: cover; }
.proof-output { display: block; width: 88%; height: auto; max-height: 74%; object-fit: contain; }
.proof-direction { color: var(--color-primary); font-size: 1.5rem; font-weight: 650; text-align: center; }
.proof-caption { margin: 10px 0 0; color: var(--color-text-muted); font-size: .82rem; line-height: 1.35; }
.proof-footnote { margin-top: 18px; color: var(--color-text-subtle); font-size: .78rem; }

.btn-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  touch-action: manipulation;
  transition-property: background-color, border-color, box-shadow, color, opacity, scale;
  transition-duration: 150ms;
  transition-timing-function: ease-out;
}
.btn:active { scale: .96; }
.btn-primary { color: #fff; background: var(--color-primary); box-shadow: 0 2px 5px rgba(14, 116, 104, .18); }
.btn-primary:hover { color: #fff; background: var(--color-primary-hover); box-shadow: 0 4px 10px rgba(14, 116, 104, .22); }
.btn-secondary { color: var(--color-text); background: var(--color-surface); border-color: var(--color-border-strong); }
.btn-secondary:hover { color: var(--color-primary-hover); border-color: var(--color-primary); background: var(--color-primary-soft); }
.btn-ghost { color: var(--color-text-muted); background: transparent; }
.btn-ghost:hover { color: var(--color-primary-hover); background: var(--color-primary-soft); }
.btn:disabled { cursor: not-allowed; opacity: .55; }

.progress-wrap { display: flex; flex-direction: column; align-items: center; min-height: 238px; padding: 46px 20px; text-align: center; }
.spinner { width: 32px; height: 32px; margin-bottom: 18px; border: 3px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; }
@media (prefers-reduced-motion: no-preference) { .spinner { animation: spin .8s linear infinite; } }
@keyframes spin { to { transform: rotate(360deg); } }
.progress-label { margin: 0; color: var(--color-text); font-weight: 700; }
.progress-text.extra { margin: 8px 0 0; color: var(--color-text-muted); font-size: .88rem; }
.progress-wrap .btn { margin-top: 18px; }

.result-stage { margin-top: 30px; }
.result-heading h2 { margin-bottom: 8px; }
.result-copy { margin: 0; color: var(--color-text-muted); }
.result-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(140px, .4fr); align-items: center; gap: 20px; margin-top: 22px; }
.result-preview-wrap { min-width: 0; }
.result-actions { display: flex; flex-direction: column; align-items: stretch; gap: 8px; }
.result-actions .btn { width: 100%; }
.btn-download { min-height: 52px; font-size: 1rem; }
.preview-canvas-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 140px;
  padding: 12px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.preview-canvas-wrap.result {
  min-height: 220px;
  background-color: #fff;
  background-image: linear-gradient(45deg, #e6ece8 25%, transparent 25%), linear-gradient(-45deg, #e6ece8 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e6ece8 75%), linear-gradient(-45deg, transparent 75%, #e6ece8 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
}
canvas.preview { display: block; max-width: 100%; height: auto; outline: 1px solid rgba(0, 0, 0, .1); outline-offset: -1px; }
.result-preview { width: min(100%, 560px); max-height: 330px; }
.checkerboard-note { display: flex; align-items: center; justify-content: center; gap: 7px; margin: 10px 0 0; color: var(--color-text-muted); font-size: .8rem; }
.checker-swatch { width: 14px; height: 14px; background-color: #fff; background-image: linear-gradient(45deg, #dfe8e2 25%, transparent 25%), linear-gradient(-45deg, #dfe8e2 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #dfe8e2 75%), linear-gradient(-45deg, transparent 75%, #dfe8e2 75%); background-position: 0 0, 0 4px, 4px -4px, -4px 0; background-size: 8px 8px; border: 1px solid var(--color-border); }
.original-details { margin-top: 22px; border-top: 1px solid var(--color-border); }
.original-details summary { min-height: 46px; padding-block: 14px; color: var(--color-text); cursor: pointer; font-size: .9rem; font-weight: 700; }
.original-preview { max-width: 440px; }
.original-preview .preview-canvas-wrap { min-height: 120px; }
.crop-area { position: relative; max-width: 100%; margin: 20px 0 10px; overflow: visible; }
.crop-area > canvas { display: block; max-width: 100%; height: auto; border-radius: var(--radius-sm); }
.crop-rect { position: absolute; border: 2px solid var(--color-primary); box-shadow: 0 0 0 9999px rgba(21, 35, 30, .38); cursor: move; touch-action: none; }
.crop-rect:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 3px; }
.crop-rect .handle { position: absolute; width: 22px; height: 22px; background: #fff; border: 2px solid var(--color-primary); border-radius: 50%; cursor: pointer; }
.crop-rect .handle:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.crop-rect .handle.tl { top: -12px; left: -12px; cursor: nwse-resize; }
.crop-rect .handle.tr { top: -12px; right: -12px; cursor: nesw-resize; }
.crop-rect .handle.bl { bottom: -12px; left: -12px; cursor: nesw-resize; }
.crop-rect .handle.br { bottom: -12px; right: -12px; cursor: nwse-resize; }
.crop-actions { margin-top: 10px; }

.alert { margin-top: 18px; padding: 13px 15px; border-radius: var(--radius-sm); font-size: .92rem; line-height: 1.45; }
.alert-error { color: var(--color-danger); background: var(--color-danger-soft); border: 1px solid #f4c7c2; }
.alert-success { color: var(--color-success); background: var(--color-success-soft); border: 1px solid #bfe2cc; }
.error-actions { margin-top: 14px; }
.next-steps { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--color-border); }
.next-steps h3 { margin-bottom: 10px; }

.faq { max-width: var(--max-reading); margin: 108px auto 0; }
.faq h2 { margin-bottom: 24px; }
.faq-list { border-top: 1px solid var(--color-border); }
.faq details { border-bottom: 1px solid var(--color-border); }
.faq summary { min-height: 56px; padding: 17px 28px 17px 0; color: var(--color-text); cursor: pointer; font-weight: 700; list-style-position: outside; }
.faq details[open] summary { color: var(--color-primary-hover); }
.faq details p { max-width: 66ch; margin: -4px 0 20px; color: var(--color-text-muted); font-size: .95rem; line-height: 1.58; }

.site-footer { padding-block: 22px 30px; color: var(--color-text-subtle); font-size: .85rem; border-top: 1px solid var(--color-border); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 18px; }
.site-footer .container:not(.footer-inner) { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 18px; }
.site-footer a { display: inline-flex; align-items: center; min-height: 44px; color: var(--color-text-muted); text-decoration: none; }
.site-footer a:hover { color: var(--color-primary); }

/* Shared styles for the existing secondary tool pages and article pages. */
main > .container > .tool-card { max-width: 820px; margin-inline: auto; padding: 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; }
main > .container[style*="max-width:680px"] { max-width: 680px !important; }
main > .container > .tool-card h1 { max-width: 24ch; font-size: clamp(2rem, 4vw, 3rem); }
main > .container > .tool-card .subtitle { margin-bottom: 18px; }
main > .container > h1 { max-width: 24ch; }
main > .container > ol { max-width: 68ch; padding-inline-start: 1.4rem; }
main > .container > ol li { margin-block: 12px; }
main > .container > p { max-width: 68ch; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0; }
.visually-hidden-input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; }

@media (max-width: 900px) {
  main { padding-block: 42px 68px; }
  .hero-layout { grid-template-columns: minmax(0, 1fr); gap: 54px; }
  .proof-panel { padding-block-start: 0; }
  .proof-panel h2 { max-width: 28ch; }
  .faq { margin-top: 80px; }
}

@media (max-width: 560px) {
  .container { width: min(100% - 28px, var(--max-content)); }
  .header-inner { align-items: flex-start; flex-direction: column; gap: 0; padding-block: 6px 8px; }
  .site-nav { justify-content: flex-start; width: 100%; margin-inline-start: 0; gap: 0 12px; }
  .site-nav a { min-height: 38px; font-size: .8rem; }
  main { padding-block: 34px 56px; }
  h1 { max-width: 13ch; font-size: clamp(2.15rem, 12vw, 3.2rem); }
  .subtitle { font-size: 1rem; }
  .stage { margin-top: 24px; }
  .upload-zone { min-height: 224px; padding-inline: 18px; }
  .result-layout { grid-template-columns: 1fr; }
  .result-actions { align-items: stretch; }
  .result-actions .btn { width: 100%; }
  .proof-grid { grid-template-columns: 1fr 28px 1fr; gap: 8px; }
  .proof-caption { font-size: .76rem; }
  .proof-direction { font-size: 1.2rem; }
  .faq { margin-top: 66px; }
  .faq summary { padding-block: 15px; }

  /* V3.2 mobile workflow: keep the tool state in the first viewport. */
  #tool .hero-copy h1 {
    max-width: 15ch;
    font-size: clamp(1.9rem, 10.5vw, 2.8rem);
  }
  #tool[data-state="idle"] .upload-action {
    color: #fff;
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 2px 5px rgba(14, 116, 104, .18);
  }
  #tool[data-state="processing"] .hero-copy,
  #tool[data-state="result"] .hero-copy,
  #tool:has(.original-details[open]) .hero-copy {
    display: none;
  }
  .hero-layout:has(#tool[data-state="processing"]) .proof-panel,
  .hero-layout:has(#tool[data-state="result"]) .proof-panel,
  .hero-layout:has(#tool .original-details[open]) .proof-panel {
    display: none;
  }
  body:has(#tool[data-state="processing"]) .faq,
  body:has(#tool[data-state="result"]) .faq,
  body:has(#tool .original-details[open]) .faq,
  body:has(#tool[data-state="processing"]) .site-footer,
  body:has(#tool[data-state="result"]) .site-footer,
  body:has(#tool .original-details[open]) .site-footer {
    display: none;
  }
  body:has(#tool[data-state="processing"]) main,
  body:has(#tool[data-state="result"]) main,
  body:has(#tool .original-details[open]) main {
    padding-block-start: 12px;
  }
  #tool[data-state="processing"] .stage,
  #tool[data-state="result"] .stage {
    margin-top: 0;
  }
  #tool[data-state="processing"] .progress-wrap {
    min-height: 172px;
    padding: 28px 18px 22px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-border);
  }
  #tool[data-state="processing"] .spinner { margin-bottom: 12px; }
  #tool[data-state="processing"] .progress-wrap .btn { margin-top: 14px; }
  #tool[data-state="processing"] .processing-stage::after {
    display: block;
    height: clamp(190px, 54vw, 230px);
    margin-top: 16px;
    content: "";
    background:
      linear-gradient(var(--color-border) 0 0) 50% 42% / 38% 12px no-repeat,
      linear-gradient(var(--color-border) 0 0) 50% 54% / 55% 10px no-repeat,
      linear-gradient(180deg, var(--color-surface-soft), var(--color-surface));
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius-md);
  }
  #tool[data-state="result"] .result-stage { margin-top: 0; }
  #tool[data-state="result"] .result-heading h2 { font-size: 1.55rem; }
  #tool[data-state="result"] .result-layout { gap: 14px; margin-top: 16px; }
  #tool[data-state="result"] .preview-canvas-wrap.result { min-height: 200px; padding: 10px; }
  #tool[data-state="result"] .result-preview { max-height: 230px; }

  #tool:has(.original-details[open]) .result-stage {
    display: flex;
    flex-direction: column;
    margin-top: 0;
  }
  #tool:has(.original-details[open]) .result-heading,
  #tool:has(.original-details[open]) .result-preview-wrap {
    display: none;
  }
  #tool:has(.original-details[open]) .original-details {
    order: 1;
    margin-top: 0;
    border-top: 0;
  }
  #tool:has(.original-details[open]) .original-details summary {
    min-height: 42px;
    padding-block: 8px;
    font-size: .95rem;
  }
  #tool:has(.original-details[open]) .original-preview { display: none; }
  #tool:has(.original-details[open]) .crop-area {
    margin: 10px 0 12px;
    overflow: clip;
  }
  #tool:has(.original-details[open]) .crop-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 10px;
  }
  #tool:has(.original-details[open]) #cancelCropBtn { grid-column: 1 / -1; }
  #tool:has(.original-details[open]) .result-layout {
    order: 2;
    display: flex;
    margin-top: 0;
  }
  #tool:has(.original-details[open]) .result-actions {
    position: sticky;
    bottom: 0;
    z-index: 10;
    flex-direction: row;
    gap: 8px;
    width: 100%;
    padding: 10px 0 calc(10px + env(safe-area-inset-bottom));
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
  }
  #tool:has(.original-details[open]) #downloadBtn,
  #tool:has(.original-details[open]) #againBtn { display: none; }
  #tool:has(.original-details[open]) #applyCropBtn {
    display: inline-flex;
    flex: 1;
    width: auto;
  }
}

@media (max-width: 400px) {
  .proof-grid { grid-template-columns: 1fr; gap: 14px; }
  .proof-direction { transform: rotate(90deg); }
  .proof-caption { margin-top: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media (forced-colors: active) {
  .upload-zone, .btn, .preview-canvas-wrap { border: 1px solid ButtonText; }
  .btn-primary { color: ButtonText; background: ButtonFace; }
}