:root {
  --brand: #58e6b1;
  --brand-dark: #153c31;
  --bg: #0b1014;
  --panel: #151d24;
  --text: #f7faf9;
  --text-secondary: #a9b5b1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 32px 16px 56px;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 50% -10%, #17323f 0%, var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.card {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.hero {
  text-align: center;
  margin-bottom: 28px;
}

.hero h1 {
  margin: 0;
  font-size: 40px;
  letter-spacing: 1px;
  color: var(--brand);
}

.tagline {
  margin: 6px 0 0;
  color: var(--text-secondary);
  font-size: 15px;
}

.download {
  padding: 24px;
  background: var(--panel);
  border: 1px solid #223038;
  border-radius: 16px;
  text-align: center;
}

.button {
  display: inline-block;
  padding: 14px 40px;
  background: var(--brand);
  color: #06231a;
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 12px;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.meta {
  margin: 14px 0 0;
  color: var(--text-secondary);
  font-size: 13px;
}

.notes {
  margin: 10px 0 0;
  color: var(--text-secondary);
  font-size: 13px;
  white-space: pre-line;
}

.steps,
.tips {
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--panel);
  border: 1px solid #223038;
  border-radius: 16px;
}

h2 {
  margin: 0 0 12px;
  font-size: 16px;
  color: var(--brand);
}

ol,
ul {
  margin: 0;
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 14px;
}

li:last-child {
  margin-bottom: 0;
}

strong {
  color: var(--text);
}

footer {
  margin-top: 24px;
  text-align: center;
  color: #6d7b78;
  font-size: 12px;
}

footer p {
  margin: 0;
}