body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f7f8fa;
  color: #222;
  margin: 0;
  padding: 0;
}

h1 {
  margin-top: 32px;
  font-size: 2.2em;
  text-align: center;
  color: #2a3a4d;
}

.container {
  max-width: 700px;
  margin: 32px auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 32px 24px 24px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.input-columns {
  width: 100%;
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  gap: 24px 0;
  margin-bottom: 12px;
  justify-content: center;
  align-items: center;
}

.input-column {
  display: flex;
  flex-direction: row;
  gap: 24px;
  min-width: unset;
  max-width: unset;
  flex: none;
  align-items: flex-start;
  justify-content: center;
}

.input-column label {
  min-width: 180px;
  max-width: 180px;
  align-items: center;
  text-align: center;
}

label {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 10px 18px 10px 0;
  font-size: 1.08em;
  color: #2a3a4d;
  gap: 4px;
  width: 100%;
}

input[type="number"], select, input[type="file"] {
  margin-left: 0;
  width: 100%;
  box-sizing: border-box;
  padding: 7px 8px;
  border: 1px solid #cfd8dc;
  border-radius: 6px;
  font-size: 1em;
  background: #f3f6fa;
  transition: border-color 0.2s;
}
input[type="number"]:focus, select:focus, input[type="file"]:focus {
  border-color: #4f8cff;
  outline: none;
}

input[type="number"] {
  text-align: center;
}

button,
.generate-btn {
  background: linear-gradient(0deg, #4f8cff 0%, #38c6fa 100%);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 24px;
  font-size: 1.1em;
  font-weight: 500;
  cursor: pointer;
  margin-top: 18px;
  box-shadow: 0 2px 8px rgba(79,140,255,0.08);
  transition: background-color 0.5s, background-image 0.5s, filter 0.5s;
}
button:hover,
.generate-btn:hover {
  background: linear-gradient(0deg, #38c6fa 0%, #4f8cff 100%);
  filter: brightness(1.08);
}

.generate-btn {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 28px auto 0 auto;
  font-size: 1.15em;
  letter-spacing: 0.02em;
}

#presetsSummary {
  font-size: 1em;
  color: #4f8cff;
  margin-bottom: 10px;
}

#customSizeInputs {
  margin-left: 10px;
}

canvas {
  border: 1px solid #cfd8dc;
  border-radius: 8px;
  margin-top: 18px;
  box-shadow: 0 2px 12px rgba(44,62,80,0.07);
  display: block;
  max-width: 100%;
  width: 100%;
  height: auto;
}

input[type="checkbox"] {
  accent-color: #4f8cff;
  margin-right: 6px;
}

.file-input-row {
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}
.file-input-row input[type="file"] {
  font-size: 1.08em;
  background: #f3f6fa;
  border: 1px solid #cfd8dc;
  border-radius: 6px;
  padding: 7px 12px;
  margin-left: 0;
  box-shadow: 0 1px 4px rgba(44,62,80,0.04);
}

.stats-row {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 16px 0 0 0;
  text-align: center;
}
.stats-row label {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  font-size: 1.08em;
  color: #2a3a4d;
  gap: 8px;
  justify-content: center;
  width: auto;
}

.input-column:first-child label {
  align-items: center;
  text-align: center;
  width: 100%;
}
.input-column:first-child select {
  text-align: center;
  margin: 0 auto;
  display: block;
  width: 100%;
}
.input-column:first-child option {
  text-align: center;
}

@media (max-width: 800px) {
  .container {
    max-width: 98vw;
    padding: 18px 6vw 18px 6vw;
  }
  h1 {
    font-size: 1.4em;
  }
  .input-columns {
    gap: 18px 0;
  }
  .input-column {
    flex-direction: column;
    gap: 8px;
    align-items: center;
    justify-content: center;
  }
  .input-column label {
    min-width: unset;
    max-width: 320px;
  }
}