:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  background: #f4f7fb;
  color: #172033;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(65, 105, 225, 0.12), transparent 34rem),
    #f4f7fb;
}

main {
  width: min(760px, calc(100% - 28px));
  margin: 32px auto;
  padding: 28px;
  border: 1px solid #e4e9f2;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 18px 50px rgba(27, 42, 74, 0.08);
}

header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e8edf5;
}

.brand {
  margin: 0 0 8px;
  color: #4169e1;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0;
  font-size: clamp(25px, 5vw, 34px);
  line-height: 1.22;
}

h2 {
  margin: 28px 0 10px;
  font-size: 18px;
}

h3 {
  margin: 20px 0 8px;
  font-size: 15px;
}

p,
li,
td,
th,
label,
input,
button {
  font-size: 14px;
  line-height: 1.68;
}

p,
ul,
ol {
  margin: 9px 0;
}

ul,
ol {
  padding-left: 22px;
}

.meta,
.muted {
  color: #68748a;
}

.notice {
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px solid #cfdafa;
  border-radius: 13px;
  background: #f1f5ff;
}

.warning {
  border-color: #f3caca;
  background: #fff6f6;
  color: #8f2f2f;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
}

th,
td {
  padding: 10px;
  border: 1px solid #e2e7ef;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f7f9fc;
}

a {
  color: #315acb;
}

footer {
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid #e8edf5;
  color: #68748a;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.form-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 750;
}

input {
  width: 100%;
  min-height: 44px;
  padding: 8px 11px;
  border: 1px solid #cdd5e2;
  border-radius: 10px;
  background: #fff;
  color: #172033;
}

button {
  min-height: 46px;
  padding: 8px 14px;
  border: 0;
  border-radius: 11px;
  background: #d73a49;
  color: #fff;
  font-weight: 900;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

#result {
  display: none;
  padding: 12px 14px;
  border-radius: 11px;
}

#result.visible {
  display: block;
}

#result.success {
  background: #ecf9f0;
  color: #176536;
}

#result.error {
  background: #fff0f0;
  color: #962f2f;
}

@media (max-width: 560px) {
  main {
    margin: 14px auto;
    padding: 20px;
    border-radius: 16px;
  }
}