:root {
  --ink: #1f1f1f;
  --blue: #0b57d0;
  --hairline: #c4c7c5;
  --bg: #ffffff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}
.stage {
  max-width: 480px;
  margin: 64px auto;
  padding: 0 20px;
}
.wordmark {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 32px;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}
.card {
  border: 1px solid var(--hairline);
  border-radius: 16px;
  padding: 28px;
}
.card h1 { font-size: 20px; margin: 0 0 8px; }
.card p { color: var(--ink); margin: 0 0 16px; }
label { display: block; font-weight: 500; margin: 0 0 6px; }
input[type="text"], input[type="email"], input[type="password"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--hairline);
  border-radius: 10px;
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 16px;
}
.btn {
  display: inline-block;
  background: var(--blue);
  color: #ffffff;
  border: none;
  border-radius: 24px;
  padding: 13px 24px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}
.btn:disabled { opacity: 0.5; cursor: default; }
.error { color: #b3261e; margin: 0 0 16px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--hairline); }
.tag { display: inline-block; padding: 2px 8px; border-radius: 100px; font-size: 12px; }
.tag.paid { background: #e6f4ea; color: #1e7e34; }
.tag.unpaid { background: #fce8e6; color: #b3261e; }
audio { width: 100%; margin-top: 24px; }