:root {
    color-scheme: dark;
    --bg: #0a0a0a;
    --text: #f5f5f5;
    --muted: #a0a0a0;
    --pink: #ff3ec8;
    --blue: #3ec8ff;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}
* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    background:
          radial-gradient(circle at top, rgba(62,200,255,.10), transparent 32%),
          linear-gradient(180deg, #111 0%, var(--bg) 44%);
}
button, input { font: inherit; }
.shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 28px 16px;
}
.card {
    width: min(100%, 590px);
    background: rgba(15,15,15,.96);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 26px;
    padding: 28px;
    box-shadow: 0 28px 80px rgba(0,0,0,.48);
}
header { text-align: center; margin-bottom: 26px; }
.eyebrow {
    font-size: 11px;
    letter-spacing: .22em;
    color: var(--muted);
    margin-bottom: 9px;
    font-weight: 700;
}
h1 {
    margin: 0;
    font-size: clamp(28px, 7vw, 42px);
    line-height: .98;
    font-weight: 900;
}
.sub { color: var(--muted); margin: 13px auto 0; max-width: 430px; line-height: 1.45; }
.hidden { display: none !important; }

.mode-picker { display: grid; gap: 10px; }
.mode-card {
    display: block;
    text-decoration: none;
    color: var(--text);
    border: 1px solid rgba(255,255,255,.13);
    border-radius: 16px;
    padding: 16px;
    background: linear-gradient(135deg, rgba(255,255,255,.075), rgba(255,255,255,.025));
    transition: transform .15s ease, border-color .15s ease;
}
.mode-card:hover { transform: translateY(-1px); border-color: rgba(62,200,255,.45); }
.mode-card strong { display: block; font-size: 17px; }
.mode-card span { display: block; color: var(--muted); font-size: 13px; margin-top: 5px; }
.mode-card.muted { opacity: .55; }

label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 8px; }
.optional { opacity: .7; }
.field input {
    width: 100%;
    border: 1px solid rgba(255,255,255,.14);
    background: #0b0b0b;
    color: var(--text);
    padding: 14px;
    border-radius: 13px;
    outline: none;
}
.field input:focus { border-color: var(--blue); }
.amount-field {
    display: flex; align-items: center;
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 18px; padding: 4px 16px; background: #0b0b0b;
}
.amount-field span { font-size: 30px; color: var(--muted); }
.amount-field input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--text); font-size: 38px; padding: 12px 8px; }
.amount-field input[readonly] { opacity: .9; }
.quick-amounts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 10px; }
.quick-amounts button {
    border: 1px solid rgba(255,255,255,.14);
    color: var(--text);
    background: #181818;
    border-radius: 12px;
    padding: 10px;
    cursor: pointer;
}
.quick-amounts button:hover { border-color: var(--blue); color: var(--blue); }

.primary {
    width: 100%;
    border: 0;
    border-radius: 30px;
    padding: 15px 18px;
    font-weight: 800;
    cursor: pointer;
    margin-top: 18px;
    background: linear-gradient(90deg, var(--blue), var(--pink));
    color: #000;
}
.primary:disabled { opacity: .6; cursor: default; }

.status {
    display: none;
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(255,255,255,.07);
    font-size: 14px;
    color: var(--text);
}
.status.visible { display: block; }

.pay-options-heading {
    font-size: 13px;
    font-weight: 700;
    color: var(--muted);
    letter-spacing: .04em;
    text-transform: uppercase;
    margin: 22px 0 12px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,.10);
}
.pay-methods { display: grid; gap: 10px; }
.pay-row {
    border: 1px solid rgba(255,255,255,.13);
    border-radius: 16px;
    padding: 14px 16px;
    background: linear-gradient(135deg, rgba(255,255,255,.045), rgba(255,255,255,.015));
}
.pay-row-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 10px;
}
.pay-row-label .pay-icon {
    display: inline-grid;
    place-items: center;
    width: 18px; height: 18px;
    font-size: 12px;
    border-radius: 5px;
    background: rgba(255,255,255,.12);
    color: var(--text);
}
.wallet-slot:empty { display: none; }
.wallet-slot { min-height: 45px; }
#card-container { min-height: 90px; margin-bottom: 12px; }
#card-row .primary { margin-top: 0; }

.intent-badge {
    border: 1px solid rgba(255,255,255,.12);
    background: rgba(62,200,255,.06);
    border-radius: 13px;
    padding: 12px 14px;
    font-size: 13px;
    line-height: 1.5;
    margin-bottom: 16px;
}
.success { text-align: center; padding: 25px 5px 10px; }
.success-icon {
    width: 72px; height: 72px; margin: 0 auto 15px;
    display: grid; place-items: center; border-radius: 999px;
    background: linear-gradient(160deg, var(--blue), var(--pink));
    color: #000;
    font-size: 38px;
}
.success h2 { font-size: 26px; margin: 0 0 10px; font-weight: 900; }
.success p { color: var(--muted); }
.confirmation {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 12px;
    color: var(--muted);
    margin-top: 14px;
    overflow-wrap: anywhere;
}
.security-note { text-align: center; font-size: 12px; line-height: 1.5; color: var(--muted); margin: 24px 0 0; }
@media (max-width: 500px) {
    .card { padding: 22px 16px; border-radius: 20px; }
}