:root{--bg: #f1f3f6;--card: #ffffff;--ink: #0f172a;--muted: #6b7280;--line: #e8ebf0;--soft: #f6f8fb;--primary: #2f6bff;--primary-press: #2256e6;--green: #16a34a;--red: #dc2626;--warn-bg: #fff8e6;--warn-line: #f4e3b0;--warn-ink: #8a6516}*{margin:0;padding:0;box-sizing:border-box}html,body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}.page{min-height:100vh;padding:16px}.form-header{width:100%;max-width:440px;margin:0 auto 12px;display:flex;align-items:center;justify-content:space-between;padding:4px 6px;font-size:14px}.form-header .lang{color:var(--muted);font-weight:600}.form-header .secure{color:var(--green);font-weight:700}.card{width:100%;max-width:440px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:24px;padding:18px;display:flex;flex-direction:column;gap:14px;box-shadow:0 10px 34px #0f172a0d}.amount-card{border:1px solid var(--line);border-radius:18px;padding:16px 18px;display:flex;flex-direction:column;gap:4px}.amount-label{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.amount-value{font-size:34px;font-weight:800;letter-spacing:-.5px}.amount-sub{font-size:13px;color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:14px;padding:15px 20px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;transition:background .15s,opacity .15s}.btn.block{width:100%}.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-press)}.btn.primary:disabled{background:#9db4e8;cursor:default}.btn.ghost{background:#fff;color:var(--primary);border-color:#cfdcff}.btn.ghost:hover{background:#f4f7ff}.btn.success{background:var(--green);color:#fff;flex:1 1 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