:root {
  color-scheme: light;
  --bg: #f3f5ef;
  --surface: #fbfcf8;
  --surface-strong: #ffffff;
  --text: #162114;
  --muted: #5a6758;
  --line: #d5ddcf;
  --accent: #2d6a4f;
  --accent-strong: #1f4b37;
  --danger: #9b2226;
  --shadow: 0 20px 45px rgba(22, 33, 20, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(107, 144, 128, 0.18), transparent 32%),
    linear-gradient(180deg, #eef2e8 0%, var(--bg) 45%, #eef1eb 100%);
  color: var(--text);
}

.app-shell {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.hero {
  padding: 12px 4px 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  font-weight: 700;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
}

.intro {
  max-width: 620px;
  margin: 18px 0 0;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--muted);
}

.panel {
  background: rgba(251, 252, 248, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(213, 221, 207, 0.9);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 18px;
}

.sms-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field span,
.status-label,
.result-card h2,
.message-box h2 {
  font-size: 0.86rem;
  color: var(--muted);
  font-weight: 600;
}

input,
button,
pre,
p {
  font: inherit;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  border-radius: 14px;
  padding: 14px 16px;
  color: var(--text);
}

.actions {
  grid-column: 1 / 2;
  display: flex;
  gap: 12px;
  padding-top: 6px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 13px 22px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  cursor: pointer;
}

.result-panel {
  display: grid;
  gap: 18px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.result-card,
.message-box {
  background: var(--surface-strong);
  border: 1px solid rgba(213, 221, 207, 0.92);
  border-radius: var(--radius-md);
  padding: 18px;
}

.result-card p,
.message-box p {
  margin: 10px 0 0;
}

.code-text {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
  letter-spacing: 0.08em;
  font-weight: 800;
}

pre {
  margin: 10px 0 0;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.65;
  color: var(--text);
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 960px);
    padding-top: 28px;
  }

  .sms-form,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .actions,
  .status-row {
    flex-direction: column;
    align-items: stretch;
  }

  button {
    width: 100%;
  }
}