:root {
  --cream: #f6f1e6;
  --coffee: #3a2c1a;
  --coffee-soft: #6b5638;
  --gold: #b08d57;
  --gold-soft: #9b7d4a;
  --line: #e6ddca;
  --bg: #f0ece2;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--coffee);
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app { max-width: 1080px; margin: 0 auto; padding: 16px 16px 40px; }

.app-header { text-align: center; padding: 8px 0 16px; }
.app-header h1 { font-size: 20px; margin: 0 0 4px; letter-spacing: 1px; color: var(--coffee); }
.subtitle { font-size: 12px; color: var(--coffee-soft); margin: 0; }

.layout { display: flex; flex-direction: column; gap: 20px; }

/* 预览 */
.preview-pane { display: flex; flex-direction: column; align-items: center; }
.preview-frame {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1080 / 1920;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(58, 44, 26, 0.18);
}
#preview-canvas { width: 100%; height: 100%; display: block; }

.generate-btn {
  margin-top: 18px;
  width: 100%;
  max-width: 320px;
  padding: 14px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, #b89a5e, #8a6d3b);
  color: #fff8ea;
  font-size: 16px;
  letter-spacing: 4px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(138, 109, 59, 0.35);
}
.generate-btn:active { transform: translateY(1px); }

/* 控制区 */
.controls { display: flex; flex-direction: column; gap: 18px; }
.block { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.block-title { font-size: 14px; margin: 0 0 12px; color: var(--gold-soft); letter-spacing: 2px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #faf7f0;
  font-size: 13px;
  color: var(--coffee);
  cursor: pointer;
  user-select: none;
}
.chip.active { background: var(--coffee); color: #fff8ea; border-color: var(--coffee); }
.chip.disabled { opacity: 0.45; cursor: not-allowed; }
.chip .soon { font-size: 10px; color: var(--gold-soft); margin-left: 4px; }
.chip.active .soon { color: #d8c19a; }

/* 表单 */
.form { display: flex; flex-direction: column; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 12px; color: var(--coffee-soft); }
.field input {
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  color: var(--coffee);
  background: #fbf9f4;
  outline: none;
}
.field input:focus { border-color: var(--gold); background: #fff; }

/* 结果弹层 */
.overlay {
  position: fixed; inset: 0;
  background: rgba(30, 22, 12, 0.85);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; padding: 20px;
}
.overlay.hidden { display: none; }
.overlay-inner { text-align: center; max-width: 360px; width: 100%; }
.overlay-tip { color: #f3e9d6; font-size: 13px; margin: 0 0 12px; letter-spacing: 1px; }
#result-img { width: 78%; max-width: 300px; border-radius: 8px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); }
.overlay-actions { margin-top: 18px; display: flex; gap: 12px; justify-content: center; }
.btn-ghost {
  padding: 9px 20px; border: 1px solid rgba(255,255,255,0.5);
  border-radius: 999px; color: #f3e9d6; font-size: 14px;
  background: transparent; cursor: pointer; text-decoration: none;
}

/* 桌面端：两栏 */
@media (min-width: 860px) {
  .layout { flex-direction: row; align-items: flex-start; gap: 32px; }
  .preview-pane { position: sticky; top: 20px; flex: 0 0 360px; }
  .preview-frame { max-width: 360px; }
  .generate-btn { max-width: 360px; }
  .controls { flex: 1; }
}