:root {
  --ink: #17211b;
  --muted: #667069;
  --paper: #f7f8f3;
  --white: #ffffff;
  --line: #dce1da;
  --green: #287a4d;
  --green-dark: #1c5c39;
  --lime: #d9f99d;
  --error: #b42318;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(rgba(40, 122, 77, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(40, 122, 77, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  font-family: "DM Sans", sans-serif;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0;
}

.brand {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--ink);
  font-family: "Manrope", sans-serif;
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 22px;
  height: 22px;
  background: var(--green);
  border-radius: 4px 10px 4px 10px;
  transform: rotate(-8deg);
}

.privacy-note {
  color: var(--muted);
  font-size: 13px;
}

.privacy-note::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: #39a96b;
}

main {
  width: min(900px, calc(100% - 40px));
  margin: 5vh auto 0;
}

.intro { text-align: center; }

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: "Manrope", sans-serif;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1.02;
  letter-spacing: 0;
}

h1 span { color: var(--green); }

.subtitle {
  margin: 22px auto 34px;
  color: var(--muted);
  font-size: 17px;
}

.workspace { margin-bottom: 36px; }

.drop-zone {
  min-height: 300px;
  padding: 44px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px dashed #aeb9af;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  cursor: pointer;
  outline: none;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.dragging {
  border-color: var(--green);
  background: #f2faef;
  transform: translateY(-2px);
}

.upload-icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin-bottom: 18px;
  color: var(--green);
  border-radius: 50%;
  background: var(--lime);
}

.drop-zone h2 {
  margin: 0 0 8px;
  font: 700 20px "Manrope", sans-serif;
}

.drop-zone p { margin: 0 0 18px; color: var(--muted); }
.drop-zone p span { color: var(--green); font-weight: 600; }
.drop-zone small { color: #89928c; }

.result-panel {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 50px rgba(23, 33, 27, 0.1);
}

.image-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 420px;
  padding: 24px;
}

.checkerboard {
  background-color: #fff;
  background-image: linear-gradient(45deg, #e8ece8 25%, transparent 25%), linear-gradient(-45deg, #e8ece8 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e8ece8 75%), linear-gradient(-45deg, transparent 75%, #e8ece8 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}

.image-stage img {
  display: block;
  max-width: 100%;
  max-height: 440px;
  object-fit: contain;
}

.processing {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(247, 248, 243, 0.94);
}

.processing[hidden] { display: none; }

.processing small { color: var(--muted); }

.spinner {
  width: 38px;
  height: 38px;
  margin-bottom: 8px;
  border: 3px solid #cbd7cd;
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

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

.result-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  border-top: 1px solid var(--line);
}

.result-actions > div:first-child {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  column-gap: 9px;
}

.result-actions small {
  grid-column: 2;
  max-width: 300px;
  overflow: hidden;
  color: var(--muted);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.success-dot { width: 9px; height: 9px; border-radius: 50%; background: #39a96b; }
.buttons { display: flex; gap: 10px; }

.button {
  min-height: 44px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: 600 14px "DM Sans", sans-serif;
  text-decoration: none;
  cursor: pointer;
}

.button.primary { color: white; border-color: var(--green); background: var(--green); }
.button.primary:hover { background: var(--green-dark); }
.button.secondary { color: var(--ink); background: var(--white); }
.button[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }

.error-message {
  margin: 12px 0 0;
  padding: 12px 16px;
  color: var(--error);
  border: 1px solid #f4c7c3;
  border-radius: 6px;
  background: #fff3f2;
  text-align: center;
}

footer {
  padding: 0 20px 28px;
  color: #7d8780;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 640px) {
  .site-header { padding-top: 20px; }
  main { margin-top: 3vh; }
  .subtitle { margin-bottom: 26px; }
  .drop-zone { min-height: 260px; }
  .image-stage { min-height: 330px; padding: 16px; }
  .result-actions { align-items: stretch; flex-direction: column; }
  .buttons { display: grid; grid-template-columns: 1fr 1fr; }
}