:root {
  --bg-main: #f5f5f7;
  --bg-card: #ffffff;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --divider: #e5e5ea;
  --accent: #0a84ff;
  --success: #34c759;
}

/* Reset */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-main);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont,
    "SF Pro Text", "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

/* Layout */
.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 40px;
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.04),
    0 1px 2px rgba(0, 0, 0, 0.06);
}

/* Header */
.header {
  margin-bottom: 32px;
}

.app-name {
  font-size: 28px;
  font-weight: 600;
  margin: 0;
}

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

/* Typography */
h1 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 8px;
}

p {
  font-size: 16px;
  margin: 12px 0;
}

ul {
  padding-left: 20px;
  margin: 12px 0;
}

li {
  margin-bottom: 8px;
}

/* Dividers */
.divider {
  height: 1px;
  background: var(--divider);
  margin: 32px 0;
}

/* Highlight blocks */
.note {
  background: #f9f9fb;
  border-left: 4px solid var(--accent);
  padding: 16px 20px;
  border-radius: 8px;
  margin: 24px 0;
  font-size: 15px;
}

/* Success / positive blocks */
.success {
  background: #f1fbf4;
  border-left: 4px solid var(--success);
  padding: 16px 20px;
  border-radius: 8px;
  margin: 24px 0;
  font-size: 15px;
}

/* Warning blocks */
.warning {
  background: #fff8ed;
  border-left: 4px solid #ff9500;
  padding: 16px 20px;
  border-radius: 8px;
  margin: 24px 0;
  font-size: 15px;
}

/* Links */
a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  margin-top: 40px;
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
}

/* Mobile tweaks */
@media (max-width: 600px) {
  .card {
    padding: 28px 22px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 18px;
  }
}