:root {
  --bg: #f4efe5;
  --paper: #fffdf8;
  --ink: #173631;
  --ink-soft: #4a6b64;
  --line: #c9ddd8;
  --accent: #0f7f71;
  --accent-strong: #0c655b;
  --ok: #165f43;
  --warn: #8f3023;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  color: var(--ink);
  font-family: "Manrope", sans-serif;
  background:
    radial-gradient(circle at 16% 14%, #d8eee9 0 20%, transparent 48%),
    radial-gradient(circle at 86% 88%, #efe3cd 0 18%, transparent 52%),
    linear-gradient(145deg, #f7f2e9, var(--bg));
}

.shell {
  width: min(760px, 100%);
  border: 1px solid var(--line);
  border-radius: 22px;
  overflow: hidden;
  background: var(--paper);
  box-shadow: 0 28px 60px rgba(18, 49, 44, 0.15);
}

.mast {
  border-bottom: 1px solid var(--line);
  padding: 28px 28px 22px;
  background: linear-gradient(180deg, rgba(216, 237, 230, 0.45), rgba(255, 253, 248, 0));
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  color: var(--ink-soft);
}

h1 {
  margin: 8px 0 4px;
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.04;
}

.sub {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.panel {
  padding: 22px 28px 28px;
  display: grid;
  gap: 14px;
}

label {
  font-size: 14px;
  color: var(--ink-soft);
  font-weight: 600;
}

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

input {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 14px;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 127, 113, 0.14);
}

button {
  border: 0;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.2s ease, opacity 0.2s ease;
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-strong);
}

.btn-ghost {
  color: var(--ink);
  background: #eef7f4;
  border: 1px solid var(--line);
}

.meta {
  font-size: 13px;
  color: var(--ink-soft);
  min-height: 18px;
}

.status {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.45;
  background: #f7fbf9;
  color: var(--ink-soft);
  min-height: 46px;
}

.status.ok {
  border-color: #bde3d3;
  background: #f2fbf6;
  color: var(--ok);
}

.status.error {
  border-color: #e6bdb6;
  background: #fff3f0;
  color: var(--warn);
}

.code-card {
  border: 1px dashed #a8cdc4;
  border-radius: 14px;
  background: #f8fcfb;
  padding: 14px;
  display: grid;
  gap: 12px;
}

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ink-soft);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.code-value {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(40px, 8vw, 68px);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-align: center;
  color: var(--ink);
  line-height: 1;
  user-select: all;
}

@media (max-width: 680px) {
  .shell {
    border-radius: 18px;
  }

  .mast,
  .panel {
    padding-left: 18px;
    padding-right: 18px;
  }

  .row {
    grid-template-columns: 1fr;
  }

  .code-value {
    letter-spacing: 0.08em;
  }
}