:root {
  --bg: linear-gradient(130deg, #f6f8fb, #f0f8ff 45%, #effff5);
  --ink: #0c203b;
  --accent: #0f6fff;
  --card: #ffffff;
  --line: #dfe6f2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--ink);
  background: var(--bg);
}

.container {
  width: min(1000px, 92vw);
  margin: 40px auto;
  display: grid;
  gap: 24px;
}

.hero,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

.badge {
  display: inline-block;
  margin: 0 0 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #ecf3ff;
  color: var(--accent);
  font-size: 13px;
}

h1 {
  margin: 6px 0 10px;
  font-size: clamp(24px, 3vw, 34px);
}

.subtitle {
  margin: 0 0 18px;
  color: #405774;
}

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

.subscribe-form-alt {
  margin-top: 10px;
  align-items: center;
}

.subscribe-form input {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #cdd7e7;
  font-size: 15px;
}

.form-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  align-self: center;
}

.subscribe-form button {
  border: none;
  border-radius: 10px;
  height: 44px;
  padding: 0 16px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 43px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid #cdd7e7;
  color: #1d3e66;
  text-decoration: none;
  background: #fff;
  font-weight: 600;
}

.subscribe-form-alt .form-actions button {
  height: 43px;
}

.feedback {
  min-height: 24px;
  margin: 8px 0 0;
}

.feedback.success {
  color: #137333;
}

.feedback.error {
  color: #ba1a1a;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.guide-list {
  margin: 14px 0 0;
  padding-left: 20px;
  color: #384f6d;
}

.guide-list li {
  margin: 6px 0;
}

.activity-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 12px;
}

.activity-list li {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fff;
}

.activity-list h3 {
  margin: 0 0 8px;
}

.activity-list p {
  margin: 4px 0;
  color: #384f6d;
}

@media (max-width: 740px) {
  .subscribe-form {
    grid-template-columns: 1fr;
  }

  .subscribe-form button {
    height: 44px;
  }

  .form-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .ghost-btn {
    height: 43px;
  }

  .subscribe-form-alt .form-actions button {
    height: 43px;
  }
}