:root {
  --bg: #f6efe5;
  --panel: rgba(255, 250, 243, 0.88);
  --panel-border: rgba(52, 41, 34, 0.12);
  --text: #1f1b18;
  --muted: #6d6258;
  --accent: #df5b31;
  --accent-strong: #bc441d;
  --shadow: 0 22px 70px rgba(74, 45, 24, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(250, 185, 112, 0.45), transparent 32%),
    radial-gradient(circle at right center, rgba(223, 91, 49, 0.18), transparent 24%),
    linear-gradient(180deg, #fbf6ef 0%, #f4eadf 100%);
}

.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.hero h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 0.98;
}

.hero-copy {
  max-width: 640px;
  margin: 16px 0 0;
  font-size: 1.04rem;
  line-height: 1.7;
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.upload-panel,
.preview-panel,
.output-panel {
  padding: 24px;
}

.dropzone {
  min-height: 220px;
  border: 2px dashed rgba(223, 91, 49, 0.35);
  border-radius: calc(var(--radius-lg) - 8px);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  cursor: pointer;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.75), rgba(255, 245, 236, 0.9)),
    repeating-linear-gradient(
      45deg,
      rgba(223, 91, 49, 0.03) 0,
      rgba(223, 91, 49, 0.03) 12px,
      transparent 12px,
      transparent 24px
    );
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.dragover {
  transform: translateY(-2px);
  border-color: rgba(223, 91, 49, 0.75);
  box-shadow: inset 0 0 0 1px rgba(223, 91, 49, 0.2);
  outline: none;
}

.dropzone-copy {
  display: grid;
  gap: 10px;
}

.dropzone-copy strong {
  font-size: 1.35rem;
}

.dropzone-copy span {
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.field {
  display: grid;
  gap: 8px;
  font-size: 0.94rem;
}

.field span {
  color: var(--muted);
}

select,
input[type="color"] {
  width: 100%;
  min-height: 46px;
  border: 1px solid rgba(31, 27, 24, 0.12);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.9);
  padding: 0 12px;
  font: inherit;
}

.checkbox-field {
  align-content: end;
}

.checkbox-field input {
  margin-right: 8px;
}

.actions {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}

button {
  min-height: 48px;
  border: 0;
  border-radius: 999px;
  padding: 0 20px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 180ms ease,
    opacity 180ms ease,
    background 180ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.primary {
  color: #fff7f2;
  background: linear-gradient(135deg, var(--accent), #f08e4f);
}

.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(31, 27, 24, 0.08);
}

.status {
  margin: 14px 0 0;
  min-height: 24px;
  color: var(--muted);
}

.preview-header,
.output-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.preview-header h2,
.output-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.meta,
.output-header span {
  color: var(--muted);
  font-size: 0.95rem;
}

.preview-stage {
  margin-top: 18px;
  padding: 18px;
  border-radius: calc(var(--radius-lg) - 8px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(246, 235, 222, 0.95));
  border: 1px solid rgba(31, 27, 24, 0.08);
}

#preview-canvas {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  aspect-ratio: 1;
  border-radius: 28%;
  background:
    linear-gradient(45deg, rgba(31, 27, 24, 0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(31, 27, 24, 0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(31, 27, 24, 0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(31, 27, 24, 0.05) 75%);
  background-size: 22px 22px;
  background-position:
    0 0,
    0 11px,
    11px -11px,
    -11px 0;
  box-shadow: 0 24px 60px rgba(54, 38, 23, 0.16);
}

.size-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.size-summary div {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(31, 27, 24, 0.08);
}

.size-summary strong {
  display: block;
  font-size: 1.7rem;
}

.size-summary span {
  color: var(--muted);
}

.output-panel {
  margin-top: 20px;
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.icon-card {
  padding: 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(31, 27, 24, 0.08);
}

.icon-card strong,
.icon-card span {
  display: block;
}

.icon-card strong {
  font-size: 1rem;
}

.icon-card span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.93rem;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .controls {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 28px;
  }

  .upload-panel,
  .preview-panel,
  .output-panel {
    padding: 18px;
  }

  .actions,
  .preview-header,
  .output-header {
    flex-direction: column;
    align-items: stretch;
  }

  button {
    width: 100%;
  }
}