:root {
  --brand: #c93756;
  --brand-dark: #a82844;
  --bg: #faf6f3;
  --card-bg: #ffffff;
  --text: #1f1b1b;
  --text-muted: #6b5f5f;
  --border: #e7dcd6;
  --success-bg: #e8f5ec;
  --success-fg: #1f6b3a;
  --error-bg: #fdecea;
  --error-fg: #a4231c;
  --shadow: 0 2px 8px rgba(60, 30, 30, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
    Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.topbar {
  background: var(--brand);
  color: #fff;
  padding: 16px 20px calc(16px + env(safe-area-inset-top)) 20px;
  padding-top: calc(16px + env(safe-area-inset-top));
}

.topbar h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.env-tag {
  margin: 4px 0 0 0;
  font-size: 12px;
  opacity: 0.85;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 20px 16px calc(20px + env(safe-area-inset-bottom)) 16px;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 20px 18px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h2 {
  margin: 0 0 6px 0;
  font-size: 16px;
  font-weight: 600;
}

.hint {
  margin: 0 0 18px 0;
  color: var(--text-muted);
  font-size: 13px;
}

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

.label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.field input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  -webkit-appearance: none;
  appearance: none;
}

.field input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(201, 55, 86, 0.15);
}

.primary-btn {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--brand);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s ease;
}

.primary-btn:hover:not(:disabled) {
  background: var(--brand-dark);
}

.primary-btn:active:not(:disabled) {
  background: var(--brand-dark);
}

.primary-btn:disabled {
  background: #c9a9b1;
  cursor: not-allowed;
}

.banner {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.45;
  word-break: break-word;
}

.banner.success {
  background: var(--success-bg);
  color: var(--success-fg);
  border: 1px solid #b8dcc4;
}

.banner.error {
  background: var(--error-bg);
  color: var(--error-fg);
  border: 1px solid #f3c4c0;
}

.footnote {
  margin-top: 18px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}

.footnote code {
  background: rgba(0, 0, 0, 0.04);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11px;
}