:root {
  color-scheme: light;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #6b7785;
  --accent: #1a7f8c;
  --accent-strong: #0f5963;
  --ring: rgba(26, 127, 140, 0.25);
  --border: #e3e7ed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at top, #ffffff 0%, #f6f4ef 55%, #efe9df 100%);
  color: var(--ink);
}

.app {
  background: var(--card);
  border-radius: 20px;
  box-shadow: 0 18px 45px rgba(31, 41, 51, 0.08);
  border: 1px solid var(--border);
}

header {
  margin-bottom: 24px;
}

header h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.2px;
}

header p {
  margin: 0;
  color: var(--muted);
}

.controls {
  display: grid;
  gap: 20px;
}

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.preview {
  display: grid;
  gap: 10px;
  padding: 14px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  background: #faf8f4;
}

.hidden {
  display: none;
}

.preview img {
  width: 50%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  object-fit: contain;
}

#imageInfo {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}

input[type="number"],
select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.file-picker {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.file-picker input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.file-name {
  font-size: 13px;
  color: var(--muted);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--ring);
}

button {
  padding: 12px 18px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.2px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  justify-self: start;
}

button:hover {
  background: var(--accent-strong);
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(26, 127, 140, 0.2);
}

.file-button {
  padding: 10px 16px;
  font-size: 14px;
  background: linear-gradient(135deg, #1a7f8c, #28a1b0);
}

.file-button:hover {
  background: linear-gradient(135deg, #0f5963, #1a7f8c);
}

.file-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--ring);
}

@media (max-width: 720px) {
  .app {
    margin: 24px 16px;
    padding: 24px;
  }

  button {
    width: 100%;
    justify-self: stretch;
  }
}