* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #fafafa;
    color: #333;
    line-height: 1.6;
}
[hidden] { display: none !important; }
a { color: #1565c0; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
button, select { font: inherit; }
button, select, .button, nav a { min-height: 44px; }
button, .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.1rem;
    border: 1px solid #1565c0;
    border-radius: 8px;
    background: #1565c0;
    color: white;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}
button:hover, .button:hover { background: #0d47a1; }
button:disabled { background: #eee; color: #555; border-color: #aaa; cursor: not-allowed; }
:focus-visible { outline: 3px solid #e65100; outline-offset: 4px; }
.skip-link { position: absolute; top: -100px; }
.skip-link:focus { top: 0; background: white; padding: 0.75rem; z-index: 1; }
header, main, footer { width: min(100% - 2rem, 1000px); margin: auto; }
header { padding: 1.25rem 0; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }
.logo { display: block; width: min(260px, 65vw); }
nav { display: flex; flex-wrap: wrap; gap: 1rem; }
nav a { display: inline-flex; align-items: center; }
h1 { font-size: clamp(1.8rem, 5vw, 2.5rem); line-height: 1.2; }
h2 { margin-top: 0; line-height: 1.3; }
h1 img, h2 img { width: 1em; vertical-align: baseline; }
p { margin: 0.65rem 0; }
.intro { padding: 1rem 0; }
.balance { display: inline-block; background: #fff8e1; border: 1px solid #ffb300; border-radius: 10px; padding: 0.75rem 1rem; font-weight: 600; }
.notice { padding: 1rem; border-radius: 10px; background: #e3f2fd; border: 1px solid #90caf9; }
section.panel { margin: 1.5rem 0; padding: clamp(1rem, 3vw, 1.75rem); border: 1px solid #ddd; border-radius: 14px; background: white; }
.currency { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; margin: 1.2rem 0; }
select { background: white; color: #333; border: 1px solid #888; border-radius: 6px; padding: 0.4rem; }
.bundles { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); gap: 1rem; }
.bundle { border: 1px solid #d6e5f3; border-radius: 12px; padding: 1.25rem; background: #f7fbff; display: flex; flex-direction: column; align-items: flex-start; }
.bundle h3 { margin: 0 0 0.5rem; font-size: 1.3rem; }
.bundle .price { font-size: 1.5rem; font-weight: 700; margin: 0.5rem 0; }
.bundle button { margin-top: auto; width: 100%; }
.steps { padding-left: 1.5rem; }
.steps li { padding: 0.2rem 0; }
.rewards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0.75rem; margin: 1rem 0; }
.rewards div { background: #fff8e1; border-radius: 8px; padding: 0.75rem; }
.rewards dt { font-weight: 600; }
.rewards dd { margin: 0; }
.status { white-space: pre-line; overflow-wrap: anywhere; }
.muted { color: #555; font-size: 0.95rem; }
footer { padding: 1.5rem 0 2.5rem; display: flex; flex-wrap: wrap; gap: 1rem; }