:root { color-scheme: dark; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #edf7f5; background: #101b20; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(ellipse at 90% 0%, #25483d80, transparent 60%), #101b20; }
main { width: min(100% - 40px, 620px); margin: 0 auto; padding: 64px 0 36px; }
.eyebrow { display: flex; align-items: center; gap: 12px; font-size: 11px; font-weight: 700; letter-spacing: .16em; color: #afcbc3; }
.mark { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; background: #c4efaa; color: #152b20; font-size: 19px; letter-spacing: 0; }
h1 { margin: 26px 0 15px; font-size: clamp(44px, 10vw, 72px); line-height: 1.02; letter-spacing: -.045em; font-weight: 750; }
h1 span { color: #c4efaa; }
.intro { color: #afc1c3; font-size: 14px; line-height: 1.7; margin-bottom: 30px; }
.card { padding: 26px; background: #203036; border: 1px solid #40564f; border-radius: 20px; box-shadow: 0 16px 50px #0002; }
.card-heading { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; justify-content: space-between; }
h2 { margin: 0; font-size: 15px; font-weight: 650; }
.badge { padding: 5px 8px; border-radius: 6px; color: #bed4cb; background: #33473e; font-size: 9px; font-weight: 750; letter-spacing: .09em; }
.address { margin: 25px 0 21px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: clamp(18px, 4.9vw, 29px); font-weight: 650; overflow-wrap: anywhere; }
button { display: flex; align-items: center; justify-content: space-between; gap: 20px; width: 100%; padding: 15px 18px; border: 0; border-radius: 10px; background: #c4efaa; color: #172c20; font: inherit; font-size: 15px; font-weight: 750; cursor: pointer; }
button:hover:enabled { background: #d7f7c4; }
button:disabled { cursor: wait; background: #40524a; color: #a9bbb2; }
button:focus-visible, .address:focus-visible { outline: 3px solid #b1d7f9; outline-offset: 5px; }
.status { min-height: 1.5em; margin: 12px 0 0; color: #c7e5bd; font-size: 12px; line-height: 1.5; }
.status.error { color: #ffcf9c; }
.hint { color: #a3b4b8; font-size: 12px; line-height: 1.7; margin: 13px 0 0; }
.instructions { margin-top: 30px; }
.instructions h2 { font-size: 17px; }
.instructions h2 span { color: #a3b4b8; font-size: 13px; font-weight: 400; }
ol { padding-left: 22px; margin: 18px 0; color: #c4d0d3; font-size: 14px; line-height: 1.8; }
li { padding-left: 6px; margin-bottom: 10px; }
li::marker { color: #c4efaa; }
strong { color: #edf7f5; font-weight: 600; }
.vietnamese, footer { color: #a3b4b8; font-size: 12px; line-height: 1.8; }
footer { margin-top: 30px; padding-top: 20px; border-top: 1px solid #33464c; }
@media (max-width: 420px) { main { padding-top: 36px; } .card { padding: 20px; } }