:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #18202a;
  background: #f5f7fb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
}

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 48px auto;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 44px);
}

.sub {
  margin: 8px 0 0;
  color: #657080;
}

.badge {
  padding: 8px 12px;
  border: 1px solid #d9dee7;
  border-radius: 999px;
  background: #fff;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.card {
  background: #fff;
  border: 1px solid #e3e7ee;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 14px 40px rgba(24, 32, 42, .08);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
  font-size: 13px;
  font-weight: 700;
}

.full { grid-column: 1 / -1; }

input, select, textarea {
  width: 100%;
  border: 1px solid #d8dee8;
  border-radius: 10px;
  padding: 12px 13px;
  font: inherit;
  background: #fff;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(0,0,0,.12);
  border-color: #9ba5b4;
}

button {
  margin-top: 20px;
  width: 100%;
  border: 0;
  border-radius: 11px;
  padding: 13px 16px;
  font-weight: 800;
  font-size: 15px;
  cursor: pointer;
  background: #18202a;
  color: #fff;
}

button:disabled {
  opacity: .55;
  cursor: wait;
}

.result {
  margin-top: 18px;
  border-radius: 11px;
  padding: 14px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  border: 1px solid #d8dee8;
  background: #f8fafc;
}

.result.success { border-color: #b7dfc3; background: #f2fbf5; }
.result.error { border-color: #efbcbc; background: #fff5f5; }
.hidden { display: none; }

.hint {
  margin: 14px 4px;
  color: #657080;
  font-size: 13px;
}

@media (max-width: 680px) {
  .shell { margin: 24px auto; }
  .topbar { flex-direction: column; }
  .grid { grid-template-columns: 1fr; }
  .full { grid-column: auto; }
}