:root {
    --green: #075E54;
    --green-light: #128C7E;
    --accent: #25D366;
    --bg: #f0f2f5;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 16px;
}

.topbar {
    background: var(--green);
    color: #fff;
    padding: 14px 0;
    box-shadow: 0 1px 4px rgba(0,0,0,.15);
}
.brand { font-size: 1.15rem; font-weight: 600; }

main.container { flex: 1; padding-top: 32px; padding-bottom: 32px; }

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    max-width: 560px;
    margin: 0 auto;
}
.card.center { text-align: center; }

h1 { color: var(--green); margin-bottom: 12px; font-size: 1.6rem; }

.checklist { list-style: none; margin: 18px 0; }
.checklist li { padding: 6px 0; border-bottom: 1px dashed var(--border); }
.checklist li:last-child { border-bottom: none; }

.muted { color: var(--muted); font-size: .9rem; margin: 12px 0; }

code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: .85em;
}

.btn {
    display: inline-block;
    margin-top: 12px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    transition: background .2s;
}
.btn:hover { background: var(--green-light); }

.footer {
    background: #fff;
    border-top: 1px solid var(--border);
    padding: 16px 0;
    color: var(--muted);
    text-align: center;
}