:root {
  color-scheme: light;
  --bg: #f3f6f4;
  --panel: #ffffff;
  --ink: #17201b;
  --muted: #69756f;
  --line: #dfe7e2;
  --accent: #16a34a;
  --accent-dark: #12843d;
  --accent-soft: #e8f7ee;
  --danger: #b42318;
  --danger-bg: #fff0ee;
  --success-bg: #edfdf3;
  --shadow: 0 24px 80px rgba(23, 32, 27, 0.12);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(22, 163, 74, 0.14), transparent 32rem),
    linear-gradient(135deg, #f8fbf9 0%, var(--bg) 100%);
}

button,
input {
  font: inherit;
}

.page-shell {
  min-height: 100dvh;
  display: grid;
  align-items: stretch;
  padding: 0;
}

.panel {
  width: 100%;
  min-height: 100dvh;
  border: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: none;
  padding: max(22px, env(safe-area-inset-top)) 18px max(22px, env(safe-area-inset-bottom));
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 8px;
  color: #ffffff;
  background: var(--accent);
  font-weight: 700;
  font-size: 22px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 13px;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 25px;
  line-height: 1.2;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 8px;
  font-size: 24px;
  line-height: 1.25;
  letter-spacing: 0;
}

.message {
  margin: 0 0 16px;
  padding: 11px 12px;
  border-radius: 8px;
  color: var(--danger);
  background: var(--danger-bg);
  font-size: 14px;
  line-height: 1.45;
}

.message.success {
  color: var(--accent-dark);
  background: var(--success-bg);
}

.form-view {
  display: grid;
  gap: 16px;
  min-height: calc(100dvh - 210px);
  align-content: start;
}

.form-view .primary-btn {
  margin-top: auto;
}

.field {
  display: grid;
  gap: 8px;
}

label {
  color: #2f3a35;
  font-size: 14px;
  font-weight: 650;
}

input {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 13px;
  color: var(--ink);
  background: #fff;
  font-size: 16px;
  outline: none;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.12);
}

.code-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) max-content;
  gap: 10px;
}

.primary-btn,
.secondary-btn {
  min-height: 52px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  transition:
    background 0.18s ease,
    transform 0.18s ease,
    opacity 0.18s ease;
}

.primary-btn {
  width: 100%;
  color: #fff;
  background: var(--accent);
}

.primary-btn:hover,
.secondary-btn:hover {
  transform: translateY(-1px);
}

.primary-btn:active,
.secondary-btn:active {
  transform: translateY(0);
}

.primary-btn:hover {
  background: var(--accent-dark);
}

.secondary-btn {
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 0 16px;
  white-space: nowrap;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

.result-view {
  text-align: center;
  padding-top: 28px;
}

.success-mark {
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  margin: 4px auto 16px;
  border-radius: 999px;
  color: #fff;
  background: var(--accent);
  font-size: 32px;
  font-weight: 800;
}

.success-text {
  margin: 12px 0 0;
  padding: 12px;
  border-radius: 8px;
  color: var(--accent-dark);
  background: var(--success-bg);
  font-size: 14px;
}

@media (min-width: 640px) {
  .page-shell {
    place-items: center;
    padding: 24px 16px;
  }

  .panel {
    width: min(100%, 430px);
    min-height: auto;
    border: 1px solid rgba(223, 231, 226, 0.86);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 28px;
  }

  .form-view {
    min-height: auto;
  }

  .form-view .primary-btn {
    margin-top: 0;
  }

  .code-row {
    grid-template-columns: minmax(0, 1fr) max-content;
  }
}

@media (max-width: 360px) {
  .panel {
    padding-left: 14px;
    padding-right: 14px;
  }

  .code-row {
    gap: 8px;
  }

  .secondary-btn {
    font-size: 14px;
    padding: 0 12px;
  }
}