:root {
  --bg: #0f1026;
  --bg2: #1a1140;
  --card: #ffffff;
  --ink: #211a3a;
  --muted: #6b6486;
  --primary: #7c4dff;
  --primary-dark: #5b2ecc;
  --accent: #ff7ac6;
  --gold: #ffd166;
  --ring: rgba(124, 77, 255, 0.35);
  --radius: 18px;
  --shadow: 0 10px 30px rgba(20, 10, 50, 0.18);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 15% -5%, #3a1d8a 0%, transparent 55%),
    radial-gradient(900px 500px at 110% 10%, #b13a8e 0%, transparent 50%),
    linear-gradient(160deg, var(--bg), var(--bg2));
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
}

/* Header */
.site-header {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(16px, 5vw, 48px);
}
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand-mark {
  font-size: 28px;
  width: 52px; height: 52px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.brand strong { display: block; font-size: 20px; }
.brand small { color: #c9c2e8; }

.age-switch { display: flex; flex-wrap: wrap; gap: 8px; background: rgba(255,255,255,.1); padding: 6px; border-radius: 999px; }
.age-btn {
  border: none; cursor: pointer;
  padding: 10px 16px; border-radius: 999px;
  background: transparent; color: #e9e5ff; font-size: 15px; font-weight: 600;
  transition: .2s;
}
.age-btn.is-active { background: #fff; color: var(--primary-dark); box-shadow: var(--shadow); }

/* Layout */
main { max-width: 760px; margin: 0 auto; padding: 8px clamp(16px, 5vw, 24px) 64px; }
.intro {
  color: #ece9ff; font-size: 17px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
  padding: 16px 18px; border-radius: var(--radius);
  margin-bottom: 20px;
}
.intro strong { color: var(--gold); }

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(18px, 4vw, 28px);
  margin-bottom: 20px;
}
.card h2 { margin: 0 0 18px; font-size: 21px; display: flex; align-items: center; gap: 10px; }
.step {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center;
  background: var(--primary); color: #fff; border-radius: 50%; font-size: 15px;
}

/* Fields */
.field { margin-bottom: 18px; }
.field > label { display: block; font-weight: 700; margin-bottom: 8px; }
.field label small { color: var(--muted); font-weight: 400; }
.field input[type="text"] {
  width: 100%; padding: 12px 14px; font-size: 16px;
  border: 2px solid #e6e2f5; border-radius: 12px; background: #faf9ff;
  transition: .15s;
}
.field input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--ring); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.chip {
  cursor: pointer; user-select: none;
  border: 2px solid #e6e2f5; background: #fff;
  padding: 7px 13px; border-radius: 999px; font-size: 14px; color: var(--ink);
  transition: .15s;
}
.chip:hover { border-color: var(--primary); }
.chip.is-on { background: var(--primary); border-color: var(--primary); color: #fff; }

/* Preview */
.preview {
  margin: 18px 0;
  background: #f3f0ff; border: 1px dashed #cdbff5;
  border-radius: 12px; padding: 14px 16px;
}
.preview-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.preview-label { font-size: 13px; color: var(--muted); }

/* 填空模板：名畫範例圖 */
.tpl-figure { margin: 0 0 18px; text-align: center; }
/* 完整顯示整張畫、不裁切：以高度為限、寬度自適應、置中 */
.tpl-figure img { max-width: 100%; max-height: 360px; width: auto; height: auto; border-radius: 12px; box-shadow: var(--shadow); display: inline-block; background: #f3f0ff; }
.tpl-figure figcaption { font-size: 12px; color: var(--muted); margin-top: 6px; }
.tpl-figure a { display: inline-block; }

/* 名畫畫風縮圖選擇器 */
.art-picker { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; }
.art-cell { cursor: pointer; border: 2px solid #e6e2f5; background: #fff; border-radius: 12px; padding: 4px; overflow: hidden; transition: .15s; text-align: center; }
.art-cell:hover { border-color: var(--primary); transform: translateY(-1px); }
.art-cell.is-on { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }
.art-cell img { width: 100%; height: 64px; object-fit: cover; border-radius: 8px; display: block; }
.art-cell span { display: block; font-size: 12px; color: var(--ink); margin-top: 4px; line-height: 1.3; }
#preview-text { margin: 6px 0 0; font-size: 17px; font-weight: 600; }

/* Buttons */
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.button {
  cursor: pointer; border: none; font-weight: 700; font-size: 16px;
  padding: 13px 22px; border-radius: 999px; text-align: center;
  transition: .15s; display: inline-block;
}
.button.primary { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; }
.button.primary:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.button.primary:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.button.ghost { background: #f0edfb; color: var(--primary-dark); }
.button.ghost:hover { background: #e6e0fa; }

.parent-tip {
  margin: 16px 0 0; font-size: 14px; color: var(--muted);
  background: #fff8e8; border-left: 4px solid var(--gold);
  padding: 10px 14px; border-radius: 8px;
}

/* Results */
.result-body { display: grid; gap: 14px; }
.prompt-box {
  border: 2px solid #e6e2f5; border-radius: 14px; overflow: hidden;
}
.prompt-box header {
  display: flex; align-items: center; justify-content: space-between;
  background: #f3f0ff; padding: 10px 14px; font-weight: 700;
}
.prompt-box .body { padding: 14px; white-space: pre-wrap; word-break: break-word; }
.copy-btn {
  cursor: pointer; border: none; background: var(--primary); color: #fff;
  padding: 6px 14px; border-radius: 999px; font-size: 13px; font-weight: 700;
}
.copy-btn.copied { background: #2ecc71; }

.spinner { text-align: center; font-size: 18px; padding: 16px; color: var(--primary-dark); }

.photo-desc { color: var(--muted); margin-top: -6px; }
.upload-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin: 12px 0; }
.photo-preview { margin: 12px 0; }
.photo-preview img { max-width: 100%; max-height: 320px; border-radius: 12px; box-shadow: var(--shadow); }

.error-msg {
  background: #ffe9ec; border-left: 4px solid #ff5470; color: #a01029;
  padding: 12px 14px; border-radius: 8px;
}

.hidden { display: none !important; }

.site-footer { text-align: center; color: #b8b2d8; padding: 24px 16px 40px; font-size: 14px; }
.site-footer p { margin: 4px 0; }

@media (max-width: 520px) {
  .age-switch { width: 100%; }
  .age-btn { flex: 1; font-size: 14px; padding: 10px 8px; }
}