:root {
  color-scheme: light;
  --bg: #f6f3ee;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #657282;
  --line: #d8dee6;
  --accent: #0e7c7b;
  --accent-strong: #075b5a;
  --warm: #d86f45;
  --danger: #b42318;
  --shadow: 0 24px 70px rgba(30, 41, 51, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    linear-gradient(120deg, rgba(14, 124, 123, 0.12), transparent 34%),
    linear-gradient(240deg, rgba(216, 111, 69, 0.13), transparent 38%),
    var(--bg);
  color: var(--ink);
}

button,
textarea,
select {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 40px 0;
  display: flex;
  align-items: center;
}

.workspace {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 20px;
}

.control-panel,
.preview-panel {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(216, 222, 230, 0.9);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.control-panel {
  padding: 24px;
}

.preview-panel {
  min-height: 680px;
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.brand-row,
.preview-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(30px, 4vw, 44px);
}

h2 {
  font-size: 24px;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid rgba(14, 124, 123, 0.24);
  border-radius: 999px;
  color: var(--accent-strong);
  background: rgba(14, 124, 123, 0.08);
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 700;
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.field span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
  color: var(--ink);
  outline: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

textarea {
  min-height: 230px;
  resize: vertical;
  padding: 14px;
  line-height: 1.55;
}

select {
  height: 44px;
  padding: 0 12px;
}

textarea:focus,
select:focus {
  border-color: var(--accent);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(14, 124, 123, 0.12);
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
}

.primary-button,
.download-button {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  font-weight: 800;
  transition:
    transform 160ms ease,
    background 160ms ease,
    opacity 160ms ease;
}

.primary-button {
  width: 100%;
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--accent);
  color: #ffffff;
  font-size: 16px;
}

.primary-button:hover,
.download-button:hover {
  transform: translateY(-1px);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.68;
  transform: none;
}

.button-icon {
  font-size: 18px;
}

.download-button {
  flex: 0 0 auto;
  background: #24313f;
  color: #ffffff;
  padding: 10px 14px;
  font-size: 14px;
}

.helper-text {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.image-stage {
  position: relative;
  flex: 1;
  min-height: 500px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(45deg, rgba(31, 41, 51, 0.04) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(31, 41, 51, 0.04) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(31, 41, 51, 0.04) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(31, 41, 51, 0.04) 75%);
  background-color: #ffffff;
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-size: 20px 20px;
}

.empty-state,
.loading-state {
  width: min(320px, 85%);
  display: grid;
  place-items: center;
  gap: 16px;
  text-align: center;
  color: var(--muted);
}

.empty-mark {
  width: 96px;
  aspect-ratio: 1;
  border: 2px solid rgba(14, 124, 123, 0.28);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(14, 124, 123, 0.24), transparent 55%),
    linear-gradient(315deg, rgba(216, 111, 69, 0.24), transparent 50%);
}

.spinner {
  width: 52px;
  aspect-ratio: 1;
  border: 4px solid rgba(14, 124, 123, 0.18);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 900ms linear infinite;
}

.result-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.error-message,
.revised-prompt {
  margin: 14px 0 0;
  border-radius: 8px;
  padding: 12px 14px;
  line-height: 1.5;
  font-size: 14px;
}

.error-message {
  color: var(--danger);
  background: rgba(180, 35, 24, 0.08);
}

.revised-prompt {
  color: #435365;
  background: rgba(36, 49, 63, 0.07);
}

.is-hidden {
  display: none !important;
}

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

@media (max-width: 900px) {
  .app-shell {
    align-items: flex-start;
    padding: 18px 0;
  }

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

  .preview-panel {
    min-height: 560px;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: min(100% - 20px, 1180px);
  }

  .control-panel,
  .preview-panel {
    padding: 16px;
  }

  .brand-row,
  .preview-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

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

  textarea {
    min-height: 210px;
  }

  .image-stage {
    min-height: 360px;
  }
}