:root {
  --bg: #ffffff;
  --surface: #f4f7f6;
  --text: #1c2726;
  --muted: #5a6b69;
  --line: #dbe3e1;
  --brand: #0b6e62;
  --brand-dark: #084f47;
  --button: #0039cb;
  --button-dark: #002c9e;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
a { color: var(--brand); }
a:hover { color: var(--brand-dark); }
h1 { font-size: 1.6rem; line-height: 1.25; margin: 1.5rem 0 .5rem; text-align: center; }
h2 { font-size: 1.3rem; line-height: 1.3; margin: 2rem 0 .6rem; }
h3 { font-size: 1.05rem; line-height: 1.35; margin: 0 0 .35rem; }
li { margin-bottom: .4rem; }
code { background: var(--surface); padding: 0 .25em; border-radius: 3px; font-size: .9em; }

.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 56px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.brand span { color: var(--brand); }
.header-link { font-size: .92rem; }

.hero p { color: var(--muted); font-size: 1.08rem; margin-top: 0; }
.meta { color: var(--muted); font-size: .88rem; margin-top: 0; text-align: center; }
.lead { margin: 0 0 1rem; }

.ad { margin: 1.75rem 0; text-align: center; }
.ad-label { display: block; font-size: .7rem; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); margin-bottom: .25rem; }
.ad-slot { min-width: 250px; min-height: 250px; display: flex; justify-content: center; align-items: center; background: var(--surface); overflow: hidden; }

.cards { display: grid; gap: 12px; }
.card { display: block; padding: 16px; border: 1px solid var(--line); border-radius: 8px; color: var(--text); text-decoration: none; }
.card:hover { border-color: var(--brand); color: var(--text); }
.card p { margin: 0 0 .5rem; color: var(--muted); font-size: .95rem; line-height: 1.5; }
.card-cta { color: var(--brand); font-size: .92rem; font-weight: 600; }

.steps { margin: 1.5rem 0; }
.steps-title { margin: 0 0 .5rem; font-weight: 600; }
.steps ol { list-style: none; margin: 0; padding: 0; }
.steps li { margin: 0 0 10px; }
.step { display: flex; align-items: center; gap: 12px; min-height: 92px; padding: 12px 16px; background: var(--button); color: #fff; border-radius: 10px; font-weight: 500; line-height: 1.3; text-decoration: none; }
.step:hover, .step:focus { background: var(--button-dark); color: #fff; }
.step-num { flex: none; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: #fff; color: var(--button-dark); font-size: .9rem; }
.step-text { flex: 1; }
.step-arrow { flex: none; font-size: 1.2rem; }

.checklist { margin: 1rem 0; padding: 4px 16px; background: var(--surface); border-left: 4px solid var(--brand); border-radius: 4px; }
.checklist h2 { margin-top: .75rem; font-size: 1.1rem; }

.reward-prompt { width: min(420px, calc(100vw - 32px)); padding: 20px; border: 0; border-radius: 12px; color: var(--text); background: var(--bg); }
.reward-prompt::backdrop { background: rgba(0, 0, 0, .55); }
.reward-prompt h2 { margin: 0 0 .4rem; font-size: 1.2rem; }
.reward-prompt p { margin: 0 0 1rem; color: var(--muted); font-size: .95rem; line-height: 1.5; }
.reward-prompt button { display: block; width: 100%; min-height: 48px; margin-top: 8px; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; }
.reward-watch { border: 0; background: var(--button); color: #fff; }
.reward-skip { border: 1px solid var(--line); background: var(--bg); color: var(--text); }

.notice { margin-top: 2rem; padding: 4px 16px 8px; background: var(--surface); border-radius: 8px; }
.notice h2 { margin-top: 1rem; }

.site-footer { margin-top: 3rem; padding: 1.5rem 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; line-height: 1.5; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }

@media (min-width: 640px) {
  h1 { font-size: 2.2rem; }
  .cards { grid-template-columns: 1fr 1fr; }
}