:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --panel: #ffffff;
  --text: #18212f;
  --muted: #667085;
  --line: #dde5ee;
  --primary: #146b5f;
  --primary-pressed: #0d5148;
  --danger: #b42318;
  --shadow: 0 18px 50px rgba(20, 35, 55, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--text);
  background: linear-gradient(180deg, #eef4f2 0%, var(--bg) 260px);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

.page {
  width: min(100%, 520px);
  margin: 0 auto;
  padding: 28px 18px 22px;
}

.public-main {
  min-height: 100vh;
}

.brand {
  padding: 20px 4px 16px;
}

.brand h1 {
  margin: 0;
  font-size: clamp(28px, 8vw, 40px);
  line-height: 1.12;
  font-weight: 800;
}

.brand p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.contact-panel,
.admin-panel {
  background: var(--panel);
  border: 1px solid rgba(221, 229, 238, 0.9);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.contact-panel {
  padding: 20px;
}

.label {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.wechat-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}

.wechat-id {
  min-width: 0;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
  font-size: 18px;
  font-weight: 750;
  word-break: break-all;
}

.btn {
  min-height: 48px;
  border: 0;
  border-radius: 8px;
  padding: 0 16px;
  color: #fff;
  background: var(--primary);
  font-weight: 750;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.btn:active {
  background: var(--primary-pressed);
}

.btn.secondary {
  color: var(--text);
  background: #edf2f7;
}

.btn.full {
  width: 100%;
}

.qr-wrap {
  margin-top: 20px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.qr-wrap img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 4px;
}

.saveable-qr {
  -webkit-touch-callout: default;
  user-select: auto;
  touch-action: manipulation;
}

.qr-tip {
  margin: 12px 0 0;
  color: var(--primary);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 10px 0 18px;
}

.admin-header h1 {
  margin: 0;
  font-size: 24px;
}

.admin-panel {
  padding: 18px;
  margin-bottom: 14px;
}

.admin-panel h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.field {
  margin-bottom: 14px;
  display: block;
}

.field input[type="text"],
.field input[type="password"] {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: #fff;
  color: var(--text);
}

.file-box {
  padding: 14px;
  border: 1px dashed #aab7c8;
  border-radius: 8px;
  background: #f8fafc;
}

.file-box input {
  width: 100%;
}

.current-qr {
  width: 132px;
  height: 132px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  margin-bottom: 14px;
}

.message {
  margin: 0 0 14px;
  padding: 12px;
  border-radius: 8px;
  background: #ecfdf3;
  color: #05603a;
  font-size: 14px;
}

.message.error {
  background: #fef3f2;
  color: var(--danger);
}

@media (max-width: 380px) {
  .wechat-row {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }
}