/* 页面样式：深色，跟证书画布一个色系。
   证书本身画在 canvas 上，这里的 CSS 只管外框，不参与导出图片。 */

:root {
  --bg: #050d12;
  --panel: rgba(16, 40, 46, 0.72);
  --line: rgba(70, 190, 180, 0.22);
  --text: #eaf6f8;
  --muted: #7d9aa8;
  --accent: #35d9c6;
  --gold: #e8b95c;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Heiti SC", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(120% 70% at 50% -10%, rgba(31, 150, 140, 0.45), transparent 60%),
    radial-gradient(110% 60% at 50% 110%, rgba(31, 150, 140, 0.28), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.panel {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin: 0 auto;
  padding: 40px 20px 56px;
  text-align: center;
}

/* ── 表单态 ── */
.form-title {
  margin: 0 0 10px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 1px;
}
.form-sub {
  margin: 0 0 30px;
  color: var(--muted);
  font-size: 15px;
}

.field { display: flex; flex-direction: column; gap: 14px; align-items: stretch; }

#name-input {
  width: 100%;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(8, 24, 28, 0.85);
  color: var(--text);
  font-family: var(--font);
  font-size: 18px;
  text-align: center;
  outline: none;
  transition: border-color .18s;
}
#name-input::placeholder { color: #5d7480; }
#name-input:focus { border-color: var(--accent); }

.form-tip {
  margin: 26px 0 0;
  color: #5d7480;
  font-size: 13px;
  line-height: 1.7;
}

/* ── 按钮 ── */
.btn {
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(18, 48, 54, 0.9);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .18s, transform .12s, border-color .18s;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover { background: rgba(28, 72, 80, 0.95); }
.btn:active { transform: translateY(1px); }

.btn.primary {
  background: linear-gradient(135deg, #35d9c6, #1ba9a0);
  border-color: transparent;
  color: #04211f;
}
.btn.primary:hover { filter: brightness(1.06); background: linear-gradient(135deg, #35d9c6, #1ba9a0); }

#gen-btn {
  padding: 16px 20px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, #35d9c6, #1ba9a0);
  color: #04211f;
  font-family: var(--font);
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  transition: filter .18s, transform .12s;
  -webkit-tap-highlight-color: transparent;
}
#gen-btn:hover { filter: brightness(1.06); }
#gen-btn:active { transform: translateY(1px); }

/* ── 结果区：在输入区下面长出来，所以给足上间距 + 一条分隔 ── */
#cert-panel {
  margin-top: 34px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}
#cert-panel[hidden] { display: none; }

.cert-hello {
  margin: 12px 0 22px;
  font-size: 16px;
  color: var(--muted);
}
.cert-hello b { color: var(--accent); font-size: 19px; }

.canvas-wrap {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px var(--line);
  background: var(--bg);
}
#cert-canvas {
  display: block;
  width: 100%;
  height: auto;
}

.actions {
  display: flex;
  gap: 10px;
  margin: 22px 0 0;
  flex-wrap: wrap;
  justify-content: center;
}
.actions .btn { flex: 1 1 auto; min-width: 120px; }

/* ── 分享二维码卡 ── */
.share-card {
  margin-top: 22px;
  padding: 20px 18px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(16, 40, 46, 0.72);
  text-align: center;
}
.share-card-title {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 700;
}
.qr-wrap {
  display: inline-block;
  padding: 10px;
  border-radius: 12px;
  background: #fff;
  line-height: 0;
}
#share-qr {
  display: block;
  width: 190px;
  height: auto;
  image-rendering: pixelated;   /* 别插值模糊，二维码要硬边 */
}
.share-card-note {
  margin: 12px 0 0;
  color: #5d7480;
  font-size: 13px;
}

/* ── 保存图片兜底层 ── */
#save-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
#save-overlay[hidden] { display: none; }
#overlay-bg {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.86);
}
.overlay-body {
  position: relative;
  max-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  overflow: auto;
}
#save-tip {
  margin: 0;
  color: var(--gold);
  font-size: 14px;
}
#save-img {
  display: block;
  max-height: 74vh;
  width: auto;
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 0 0 1px var(--line);
}

/* ── Toast ── */
#toast {
  position: fixed;
  left: 50%;
  bottom: 42px;
  transform: translate(-50%, 14px);
  padding: 11px 20px;
  border-radius: 999px;
  background: rgba(12, 34, 38, 0.96);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 60;
}
#toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ── 窄屏 ── */
@media (max-width: 480px) {
  .panel { padding: 28px 16px 44px; }
  .form-title { font-size: 26px; }
  .actions .btn { flex: 1 1 100%; }
}

@media (min-width: 900px) {
  .panel { max-width: 660px; }
  .canvas-wrap { max-width: 520px; margin: 0 auto; }
}